Rename library module from lib to owncloudComLibrary

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/DynamicSessionManager.java

@@ -0,0 +1,63 @@
+package com.owncloud.android.lib.common;
+
+import android.accounts.AuthenticatorException;
+import android.accounts.OperationCanceledException;
+import android.content.Context;
+
+import com.owncloud.android.lib.common.accounts.AccountUtils;
+import com.owncloud.android.lib.resources.status.OwnCloudVersion;
+
+import java.io.IOException;
+
+/**
+ * Dynamic implementation of {@link OwnCloudClientManager}.
+ *
+ * Wraps instances of {@link SingleSessionManager} and {@link SimpleFactoryManager} and delegates on one
+ * or the other depending on the known version of the server corresponding to the {@link OwnCloudAccount}
+ *
+ * @author David A. Velasco
+ */
+
+public class DynamicSessionManager implements OwnCloudClientManager {
+
+    private SimpleFactoryManager mSimpleFactoryManager = new SimpleFactoryManager();
+
+    private SingleSessionManager mSingleSessionManager = new SingleSessionManager();
+
+    @Override
+    public OwnCloudClient getClientFor(OwnCloudAccount account, Context context)
+        throws AccountUtils.AccountNotFoundException,
+                OperationCanceledException, AuthenticatorException, IOException {
+
+        OwnCloudVersion ownCloudVersion = null;
+        if (account.getSavedAccount() != null) {
+            ownCloudVersion = AccountUtils.getServerVersionForAccount(
+                account.getSavedAccount(), context
+            );
+        }
+
+        if (ownCloudVersion !=  null && ownCloudVersion.isSessionMonitoringSupported()) {
+            return mSingleSessionManager.getClientFor(account, context);
+        } else {
+            return mSimpleFactoryManager.getClientFor(account, context);
+        }
+    }
+
+    @Override
+    public OwnCloudClient removeClientFor(OwnCloudAccount account) {
+        OwnCloudClient clientRemovedFromFactoryManager = mSimpleFactoryManager.removeClientFor(account);
+        OwnCloudClient clientRemovedFromSingleSessionManager = mSingleSessionManager.removeClientFor(account);
+        if (clientRemovedFromSingleSessionManager != null) {
+            return clientRemovedFromSingleSessionManager;
+        } else {
+            return clientRemovedFromFactoryManager;
+        }
+        // clientRemoved and clientRemoved2 should not be != null at the same time
+    }
+
+    @Override
+    public void saveAllClients(Context context, String accountType) {
+        mSimpleFactoryManager.saveAllClients(context, accountType);
+        mSingleSessionManager.saveAllClients(context, accountType);
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/OwnCloudAccount.java

@@ -0,0 +1,159 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2016 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common;
+
+
+import java.io.IOException;
+
+import com.owncloud.android.lib.common.accounts.AccountUtils;
+import com.owncloud.android.lib.common.accounts.AccountUtils.AccountNotFoundException;
+import com.owncloud.android.lib.common.authentication.OwnCloudCredentials;
+import com.owncloud.android.lib.common.authentication.OwnCloudCredentialsFactory;
+
+import android.accounts.Account;
+import android.accounts.AccountManager;
+import android.accounts.AuthenticatorException;
+import android.accounts.OperationCanceledException;
+import android.content.Context;
+import android.net.Uri;
+
+/**
+ * OwnCloud Account
+ * 
+ * @author David A. Velasco
+ */
+public class OwnCloudAccount {
+
+    private Uri mBaseUri; 
+    
+    private OwnCloudCredentials mCredentials;
+
+    private String mDisplayName;
+    
+    private String mSavedAccountName;
+
+    private Account mSavedAccount;
+
+
+    /**
+     * Constructor for already saved OC accounts.
+     *
+     * Do not use for anonymous credentials.
+     */
+    public OwnCloudAccount(Account savedAccount, Context context) throws AccountNotFoundException {
+        if (savedAccount == null) {
+            throw new IllegalArgumentException("Parameter 'savedAccount' cannot be null");
+        }
+
+        if (context == null) {
+            throw new IllegalArgumentException("Parameter 'context' cannot be null");
+        }
+
+        mSavedAccount = savedAccount;
+        mSavedAccountName = savedAccount.name;
+        mCredentials = null;    // load of credentials is delayed
+
+        AccountManager ama = AccountManager.get(context.getApplicationContext());
+        String baseUrl = ama.getUserData(mSavedAccount, AccountUtils.Constants.KEY_OC_BASE_URL);
+        if (baseUrl == null ) {
+            throw new AccountNotFoundException(mSavedAccount, "Account not found", null);
+        }
+        mBaseUri = Uri.parse(AccountUtils.getBaseUrlForAccount(context, mSavedAccount));
+        mDisplayName = ama.getUserData(mSavedAccount, AccountUtils.Constants.KEY_DISPLAY_NAME);
+    }
+
+
+    /**
+     * Constructor for non yet saved OC accounts.
+     *
+     * @param baseUri           URI to the OC server to get access to.
+     * @param credentials       Credentials to authenticate in the server. NULL is valid for anonymous credentials.
+     */
+    public OwnCloudAccount(Uri baseUri, OwnCloudCredentials credentials) {
+        if (baseUri == null) {
+            throw new IllegalArgumentException("Parameter 'baseUri' cannot be null");
+        }
+        mSavedAccount = null;
+        mSavedAccountName = null;
+        mBaseUri = baseUri;
+        mCredentials = credentials != null ?
+            credentials : OwnCloudCredentialsFactory.getAnonymousCredentials();
+        String username = mCredentials.getUsername();
+        if (username != null) {
+            mSavedAccountName = AccountUtils.buildAccountName(mBaseUri, username);
+        }
+    }
+
+
+    /**
+     * Method for deferred load of account attributes from AccountManager
+     *
+     * @param context
+     * @throws AccountNotFoundException
+     * @throws AuthenticatorException
+     * @throws IOException
+     * @throws OperationCanceledException
+     */
+    public void loadCredentials(Context context) throws AuthenticatorException,
+            IOException, OperationCanceledException {
+
+        if (context == null) {
+            throw new IllegalArgumentException("Parameter 'context' cannot be null");
+        }
+
+        if (mSavedAccount != null) {
+            mCredentials = AccountUtils.getCredentialsForAccount(context, mSavedAccount);
+        }
+    }
+
+    public Uri getBaseUri() {
+        return mBaseUri;
+    }
+            
+    public OwnCloudCredentials getCredentials() {
+        return mCredentials;
+    }
+    
+    public String getName() {
+    	return mSavedAccountName;
+    }
+
+    public Account getSavedAccount() {
+        return mSavedAccount;
+    }
+
+    public String getDisplayName() {
+        if (mDisplayName != null && mDisplayName.length() > 0) {
+            return mDisplayName;
+        } else if (mCredentials != null) {
+            return mCredentials.getUsername();
+        } else if (mSavedAccount != null) {
+            return AccountUtils.getUsernameForAccount(mSavedAccount);
+        } else {
+            return null;
+        }
+    }
+
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/OwnCloudClient.java

@@ -0,0 +1,480 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *   Copyright (C) 2012  Bartek Przybylski
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common;
+
+import android.accounts.AccountManager;
+import android.accounts.AccountsException;
+import android.net.Uri;
+
+import com.owncloud.android.lib.common.accounts.AccountUtils;
+import com.owncloud.android.lib.common.authentication.OwnCloudCredentials;
+import com.owncloud.android.lib.common.authentication.OwnCloudCredentialsFactory;
+import com.owncloud.android.lib.common.authentication.OwnCloudCredentialsFactory.OwnCloudAnonymousCredentials;
+import com.owncloud.android.lib.common.http.HttpClient;
+import com.owncloud.android.lib.common.http.HttpConstants;
+import com.owncloud.android.lib.common.http.methods.HttpBaseMethod;
+import com.owncloud.android.lib.common.network.RedirectionPath;
+import com.owncloud.android.lib.common.utils.Log_OC;
+import com.owncloud.android.lib.common.utils.RandomUtils;
+import com.owncloud.android.lib.resources.status.OwnCloudVersion;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.List;
+
+import at.bitfire.dav4android.exception.HttpException;
+import okhttp3.Cookie;
+import okhttp3.Headers;
+import okhttp3.HttpUrl;
+
+import static com.owncloud.android.lib.common.http.HttpConstants.OC_X_REQUEST_ID;
+
+public class OwnCloudClient extends HttpClient {
+
+    public static final String WEBDAV_FILES_PATH_4_0 = "/remote.php/dav/files/";
+    public static final String WEBDAV_UPLOADS_PATH_4_0 = "/remote.php/dav/uploads/";
+    public static final String STATUS_PATH = "/status.php";
+    public static final String FILES_WEB_PATH = "/index.php/apps/files";
+
+    private static final String TAG = OwnCloudClient.class.getSimpleName();
+    private static final int MAX_REDIRECTIONS_COUNT = 3;
+    private static final int MAX_REPEAT_COUNT_WITH_FRESH_CREDENTIALS = 1;
+    private static final String PARAM_PROTOCOL_VERSION = "http.protocol.version";
+
+    private static byte[] sExhaustBuffer = new byte[1024];
+    private static int sIntanceCounter = 0;
+    private OwnCloudCredentials mCredentials = null;
+    private int mInstanceNumber = 0;
+    private Uri mBaseUri;
+    private OwnCloudVersion mVersion = null;
+    private OwnCloudAccount mAccount;
+
+    /**
+     * {@link @OwnCloudClientManager} holding a reference to this object and delivering it to callers; might be
+     * NULL
+     */
+    private OwnCloudClientManager mOwnCloudClientManager = null;
+
+    private String mRedirectedLocation;
+    private boolean mFollowRedirects;
+
+    public OwnCloudClient(Uri baseUri) {
+        if (baseUri == null) {
+            throw new IllegalArgumentException("Parameter 'baseUri' cannot be NULL");
+        }
+        mBaseUri = baseUri;
+
+        mInstanceNumber = sIntanceCounter++;
+        Log_OC.d(TAG + " #" + mInstanceNumber, "Creating OwnCloudClient");
+
+        clearCredentials();
+        clearCookies();
+    }
+
+    public void setCredentials(OwnCloudCredentials credentials) {
+        if (credentials != null) {
+            mCredentials = credentials;
+            mCredentials.applyTo(this);
+        } else {
+            clearCredentials();
+        }
+    }
+
+    public void clearCredentials() {
+        if (!(mCredentials instanceof OwnCloudAnonymousCredentials)) {
+            mCredentials = OwnCloudCredentialsFactory.getAnonymousCredentials();
+        }
+        mCredentials.applyTo(this);
+    }
+
+    public void applyCredentials() {
+        mCredentials.applyTo(this);
+    }
+
+    public int executeHttpMethod (HttpBaseMethod method) throws Exception {
+        boolean repeatWithFreshCredentials;
+        int repeatCounter = 0;
+        int status;
+
+        do {
+            setRequestId(method);
+
+            status = method.execute();
+            checkFirstRedirection(method);
+
+            if(mFollowRedirects && !isIdPRedirection()) {
+                status = followRedirection(method).getLastStatus();
+            }
+
+            repeatWithFreshCredentials = checkUnauthorizedAccess(status, repeatCounter);
+            if (repeatWithFreshCredentials) {
+                repeatCounter++;
+            }
+        } while (repeatWithFreshCredentials);
+
+        return status;
+    }
+
+    private void checkFirstRedirection(HttpBaseMethod method) {
+        final String location = method.getResponseHeader(HttpConstants.LOCATION_HEADER_LOWER);
+        if(location != null && !location.isEmpty()) {
+            mRedirectedLocation = location;
+        }
+    }
+
+    private int executeRedirectedHttpMethod (HttpBaseMethod method) throws Exception {
+        boolean repeatWithFreshCredentials;
+        int repeatCounter = 0;
+        int status;
+
+        do {
+            setRequestId(method);
+
+            status = method.execute();
+
+            repeatWithFreshCredentials = checkUnauthorizedAccess(status, repeatCounter);
+            if (repeatWithFreshCredentials) {
+                repeatCounter++;
+            }
+        } while (repeatWithFreshCredentials);
+
+        return status;
+    }
+
+    private void setRequestId(HttpBaseMethod method) {
+        // Clean previous request id. This is a bit hacky but is the only way to add request headers in WebDAV
+        // methods by using Dav4Android
+        deleteHeaderForAllRequests(OC_X_REQUEST_ID);
+
+        String requestId = RandomUtils.generateRandomUUID();
+
+        // Header to allow tracing requests in apache and ownCloud logs
+        addHeaderForAllRequests(OC_X_REQUEST_ID, requestId);
+
+        Log_OC.d(TAG, "Executing " + method.getClass().getSimpleName() + " in request with id " + requestId);
+    }
+
+    public RedirectionPath followRedirection(HttpBaseMethod method) throws Exception {
+        int redirectionsCount = 0;
+        int status = method.getStatusCode();
+        RedirectionPath redirectionPath = new RedirectionPath(status, MAX_REDIRECTIONS_COUNT);
+
+        while (redirectionsCount < MAX_REDIRECTIONS_COUNT &&
+                (status == HttpConstants.HTTP_MOVED_PERMANENTLY ||
+                        status == HttpConstants.HTTP_MOVED_TEMPORARILY ||
+                        status == HttpConstants.HTTP_TEMPORARY_REDIRECT)
+                ) {
+
+            final String location = method.getResponseHeader(HttpConstants.LOCATION_HEADER) != null
+                    ? method.getResponseHeader(HttpConstants.LOCATION_HEADER)
+                    : method.getResponseHeader(HttpConstants.LOCATION_HEADER_LOWER);
+
+            if (location != null) {
+                Log_OC.d(TAG + " #" + mInstanceNumber,
+                        "Location to redirect: " + location);
+
+                redirectionPath.addLocation(location);
+
+                // Release the connection to avoid reach the max number of connections per host
+                // due to it will be set a different url
+                exhaustResponse(method.getResponseBodyAsStream());
+
+                method.setUrl(HttpUrl.parse(location));
+                final String destination = method.getRequestHeader("Destination") != null
+                        ? method.getRequestHeader("Destination")
+                        : method.getRequestHeader("destination");
+
+                if (destination != null) {
+                    final int suffixIndex = location.lastIndexOf(getUserFilesWebDavUri().toString());
+                    final String redirectionBase = location.substring(0, suffixIndex);
+                    final String destinationPath = destination.substring(mBaseUri.toString().length());
+
+                    method.setRequestHeader("destination", redirectionBase + destinationPath);
+                }
+                try {
+                    status = executeRedirectedHttpMethod(method);
+                } catch (HttpException e) {
+                    if(e.getMessage().contains(Integer.toString(HttpConstants.HTTP_MOVED_TEMPORARILY))) {
+                        status = HttpConstants.HTTP_MOVED_TEMPORARILY;
+                    } else  {
+                        throw e;
+                    }
+                }
+                redirectionPath.addStatus(status);
+                redirectionsCount++;
+
+            } else {
+                Log_OC.d(TAG + " #" + mInstanceNumber, "No location to redirect!");
+                status = HttpConstants.HTTP_NOT_FOUND;
+            }
+        }
+        return redirectionPath;
+    }
+
+    /**
+     * Exhausts a not interesting HTTP response. Encouraged by HttpClient documentation.
+     *
+     * @param responseBodyAsStream InputStream with the HTTP response to exhaust.
+     */
+    public void exhaustResponse(InputStream responseBodyAsStream) {
+        if (responseBodyAsStream != null) {
+            try {
+                while (responseBodyAsStream.read(sExhaustBuffer) >= 0) ;
+                responseBodyAsStream.close();
+
+            } catch (IOException io) {
+                Log_OC.e(TAG, "Unexpected exception while exhausting not interesting HTTP response;" +
+                        " will be IGNORED", io);
+            }
+        }
+    }
+
+    public Uri getBaseFilesWebDavUri(){
+        return Uri.parse(mBaseUri + WEBDAV_FILES_PATH_4_0);
+    }
+
+    public Uri getUserFilesWebDavUri() {
+        return mCredentials instanceof OwnCloudAnonymousCredentials
+                ? Uri.parse(mBaseUri + WEBDAV_FILES_PATH_4_0)
+                : Uri.parse(mBaseUri + WEBDAV_FILES_PATH_4_0 + AccountUtils.getUserId(
+                        mAccount.getSavedAccount(), getContext()
+                )
+        );
+    }
+
+    public Uri getUploadsWebDavUri() {
+        return mCredentials instanceof OwnCloudAnonymousCredentials
+                ? Uri.parse(mBaseUri + WEBDAV_UPLOADS_PATH_4_0)
+                : Uri.parse(mBaseUri + WEBDAV_UPLOADS_PATH_4_0 + AccountUtils.getUserId(
+                        mAccount.getSavedAccount(), getContext()
+                )
+        );
+    }
+
+    /**
+     * Sets the root URI to the ownCloud server.
+     *
+     * Use with care.
+     *
+     * @param uri
+     */
+    public void setBaseUri(Uri uri) {
+        if (uri == null) {
+            throw new IllegalArgumentException("URI cannot be NULL");
+        }
+        mBaseUri = uri;
+    }
+
+    public Uri getBaseUri() {
+        return mBaseUri;
+    }
+
+    public final OwnCloudCredentials getCredentials() {
+        return mCredentials;
+    }
+
+    private void logCookie(Cookie cookie) {
+        Log_OC.d(TAG, "Cookie name: " + cookie.name());
+        Log_OC.d(TAG, "       value: " + cookie.value());
+        Log_OC.d(TAG, "       domain: " + cookie.domain());
+        Log_OC.d(TAG, "       path: " + cookie.path());
+        Log_OC.d(TAG, "       expiryDate: " + cookie.expiresAt());
+        Log_OC.d(TAG, "       secure: " + cookie.secure());
+    }
+
+    private void logCookiesAtRequest(Headers headers, String when) {
+        int counter = 0;
+        for (final String cookieHeader : headers.toMultimap().get("cookie")) {
+            Log_OC.d(TAG + " #" + mInstanceNumber,
+                    "Cookies at request (" + when + ") (" + counter++ + "): "
+                            + cookieHeader);
+        }
+        if (counter == 0) {
+            Log_OC.d(TAG + " #" + mInstanceNumber, "No cookie at request before");
+        }
+    }
+
+    private void logSetCookiesAtResponse(Headers headers) {
+        int counter = 0;
+        for (final String cookieHeader : headers.toMultimap().get("set-cookie")) {
+            Log_OC.d(TAG + " #" + mInstanceNumber,
+                    "Set-Cookie (" + counter++ + "): " + cookieHeader);
+        }
+        if (counter == 0) {
+            Log_OC.d(TAG + " #" + mInstanceNumber, "No set-cookie");
+        }
+    }
+
+    public String getCookiesString() {
+        String cookiesString = "";
+        List<Cookie> cookieList = getCookiesFromUrl(HttpUrl.parse(mBaseUri.toString()));
+
+        if (cookieList != null) {
+            for (Cookie cookie : cookieList) {
+                cookiesString += cookie.toString() + ";";
+            }
+        }
+
+        return cookiesString;
+    }
+
+    public void setCookiesForCurrentAccount(List<Cookie> cookies) {
+        getOkHttpClient().cookieJar().saveFromResponse(
+                HttpUrl.parse(getAccount().getBaseUri().toString()),
+                cookies
+        );
+    }
+
+    public void setOwnCloudVersion(OwnCloudVersion version) {
+        mVersion = version;
+    }
+
+    public OwnCloudVersion getOwnCloudVersion() {
+        return mVersion;
+    }
+
+    public void setAccount(OwnCloudAccount account) {
+        this.mAccount = account;
+    }
+
+    public OwnCloudAccount getAccount() {
+        return mAccount;
+    }
+
+    /**
+     * Checks the status code of an execution and decides if should be repeated with fresh credentials.
+     *
+     * Invalidates current credentials if the request failed as anauthorized.
+     *
+     * Refresh current credentials if possible, and marks a retry.
+     *
+     * @param status
+     * @param repeatCounter
+     * @return
+     */
+    private boolean checkUnauthorizedAccess(int status, int repeatCounter) {
+        boolean credentialsWereRefreshed = false;
+
+        if (shouldInvalidateAccountCredentials(status)) {
+            boolean invalidated = invalidateAccountCredentials();
+
+            if (invalidated) {
+                if (getCredentials().authTokenCanBeRefreshed() &&
+                        repeatCounter < MAX_REPEAT_COUNT_WITH_FRESH_CREDENTIALS) {
+
+                    try {
+                        mAccount.loadCredentials(getContext());
+                        // if mAccount.getCredentials().length() == 0 --> refresh failed
+                        setCredentials(mAccount.getCredentials());
+                        credentialsWereRefreshed = true;
+
+                    } catch (AccountsException | IOException e) {
+                        Log_OC.e(
+                                TAG,
+                                "Error while trying to refresh auth token for " + mAccount.getSavedAccount().name,
+                                e
+                        );
+                    }
+                }
+
+                if (!credentialsWereRefreshed && mOwnCloudClientManager != null) {
+                    // if credentials are not refreshed, client must be removed
+                    // from the OwnCloudClientManager to prevent it is reused once and again
+                    mOwnCloudClientManager.removeClientFor(mAccount);
+                }
+            }
+            // else: onExecute will finish with status 401
+        }
+
+        return credentialsWereRefreshed;
+    }
+
+    /**
+     * Determines if credentials should be invalidated according the to the HTTPS status
+     * of a network request just performed.
+     *
+     * @param httpStatusCode    Result of the last request ran with the 'credentials' belows.
+
+     * @return                  'True' if credentials should and might be invalidated, 'false' if shouldn't or
+     *                          cannot be invalidated with the given arguments.
+     */
+    private boolean shouldInvalidateAccountCredentials(int httpStatusCode) {
+
+        boolean should = (httpStatusCode == HttpConstants.HTTP_UNAUTHORIZED || isIdPRedirection());   // invalid credentials
+
+        should &= (mCredentials != null &&         // real credentials
+                !(mCredentials instanceof OwnCloudCredentialsFactory.OwnCloudAnonymousCredentials));
+
+        // test if have all the needed to effectively invalidate ...
+        should &= (mAccount != null && mAccount.getSavedAccount() != null && getContext() != null);
+
+        return should;
+    }
+
+    /**
+     * Invalidates credentials stored for the given account in the system  {@link AccountManager} and in
+     * current {@link OwnCloudClientManagerFactory#getDefaultSingleton()} instance.
+     *
+     * {@link #shouldInvalidateAccountCredentials(int)} should be called first.
+     *
+     * @return                  'True' if invalidation was successful, 'false' otherwise.
+     */
+    private boolean invalidateAccountCredentials() {
+        AccountManager am = AccountManager.get(getContext());
+        am.invalidateAuthToken(
+                mAccount.getSavedAccount().type,
+                mCredentials.getAuthToken()
+        );
+        am.clearPassword(mAccount.getSavedAccount()); // being strict, only needed for Basic Auth credentials
+        return true;
+    }
+
+    public OwnCloudClientManager getOwnCloudClientManager() {
+        return mOwnCloudClientManager;
+    }
+
+    void setOwnCloudClientManager(OwnCloudClientManager clientManager) {
+        mOwnCloudClientManager = clientManager;
+    }
+
+    /**
+     * Check if the redirection is to an identity provider such as SAML or wayf
+     * @return true if the redirection location includes SAML or wayf, false otherwise
+     */
+    private boolean isIdPRedirection() {
+        return (mRedirectedLocation != null &&
+                (mRedirectedLocation.toUpperCase().contains("SAML") ||
+                        mRedirectedLocation.toLowerCase().contains("wayf")));
+    }
+
+    public boolean followRedirects() {
+        return mFollowRedirects;
+    }
+
+    public void setFollowRedirects(boolean followRedirects) {
+        this.mFollowRedirects = followRedirects;
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/OwnCloudClientFactory.java

@@ -0,0 +1,160 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *   
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *   
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *   
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common;
+
+import android.accounts.Account;
+import android.accounts.AccountManager;
+import android.accounts.AccountManagerFuture;
+import android.accounts.AuthenticatorException;
+import android.accounts.OperationCanceledException;
+import android.app.Activity;
+import android.content.Context;
+import android.net.Uri;
+import android.os.Bundle;
+
+import com.owncloud.android.lib.common.accounts.AccountTypeUtils;
+import com.owncloud.android.lib.common.accounts.AccountUtils;
+import com.owncloud.android.lib.common.accounts.AccountUtils.AccountNotFoundException;
+import com.owncloud.android.lib.common.authentication.OwnCloudCredentialsFactory;
+import com.owncloud.android.lib.resources.status.OwnCloudVersion;
+
+import java.io.IOException;
+
+public class OwnCloudClientFactory {
+    
+    final private static String TAG = OwnCloudClientFactory.class.getSimpleName();
+
+    /**
+     * Creates a OwnCloudClient setup for an ownCloud account
+     *
+     * Do not call this method from the main thread.
+     *
+     * @param account                       The ownCloud account
+     * @param appContext                    Android application context
+     * @param currentActivity               Caller {@link Activity}
+     * @return                              A OwnCloudClient object ready to be used
+     * @throws AuthenticatorException       If the authenticator failed to get the authorization
+     *                                      token for the account.
+     * @throws OperationCanceledException   If the authenticator operation was cancelled while
+     *                                      getting the authorization token for the account.
+     * @throws IOException                  If there was some I/O error while getting the
+     *                                      authorization token for the account.
+     * @throws AccountNotFoundException     If 'account' is unknown for the AccountManager
+     *
+     */
+    public static OwnCloudClient createOwnCloudClient (Account account, Context appContext,
+                                                       Activity currentActivity)
+            throws OperationCanceledException, AuthenticatorException, IOException,
+            AccountNotFoundException {
+        Uri baseUri = Uri.parse(AccountUtils.getBaseUrlForAccount(appContext, account));
+        AccountManager am = AccountManager.get(appContext);
+        // TODO avoid calling to getUserData here
+        boolean isOauth2 =
+                am.getUserData(account, AccountUtils.Constants.KEY_SUPPORTS_OAUTH2) != null;
+        boolean isSamlSso =
+                am.getUserData(account, AccountUtils.Constants.KEY_SUPPORTS_SAML_WEB_SSO) != null;
+        OwnCloudClient client = createOwnCloudClient(baseUri, appContext, !isSamlSso);
+
+        String username = AccountUtils.getUsernameForAccount(account);
+        if (isOauth2) {    // TODO avoid a call to getUserData here
+            AccountManagerFuture<Bundle> future =  am.getAuthToken(
+                account,
+                AccountTypeUtils.getAuthTokenTypeAccessToken(account.type),
+                null,
+                currentActivity,
+                null,
+                null);
+
+            Bundle result = future.getResult();
+            String accessToken = result.getString(AccountManager.KEY_AUTHTOKEN);
+            if (accessToken == null) throw new AuthenticatorException("WTF!");
+            client.setCredentials(
+                OwnCloudCredentialsFactory.newBearerCredentials(username, accessToken)
+            );
+
+        } else if (isSamlSso) {    // TODO avoid a call to getUserData here
+            AccountManagerFuture<Bundle> future =  am.getAuthToken(
+               account,
+               AccountTypeUtils.getAuthTokenTypeSamlSessionCookie(account.type),
+                null,
+                currentActivity,
+                null,
+                null);
+
+            Bundle result = future.getResult();
+            String accessToken = result.getString(AccountManager.KEY_AUTHTOKEN);
+            if (accessToken == null) throw new AuthenticatorException("WTF!");
+            client.setCredentials(
+                OwnCloudCredentialsFactory.newSamlSsoCredentials(username, accessToken)
+            );
+
+
+        } else {
+            AccountManagerFuture<Bundle> future =  am.getAuthToken(
+                account,
+                AccountTypeUtils.getAuthTokenTypePass(account.type),
+                null,
+                currentActivity,
+                null,
+                null
+            );
+
+            Bundle result = future.getResult();
+            String password = result.getString(AccountManager.KEY_AUTHTOKEN);
+            OwnCloudVersion version = AccountUtils.getServerVersionForAccount(account, appContext);
+            client.setCredentials(
+                OwnCloudCredentialsFactory.newBasicCredentials(
+                    username,
+                    password,
+                    (version != null && version.isPreemptiveAuthenticationPreferred())
+                )
+            );
+        }
+
+        // Restore cookies
+        AccountUtils.restoreCookies(account, client, appContext);
+
+        return client;
+    }
+
+    /**
+     * Creates a OwnCloudClient to access a URL and sets the desired parameters for ownCloud
+     * client connections.
+     * 
+     * @param uri       URL to the ownCloud server; BASE ENTRY POINT, not WebDavPATH
+     * @param context   Android context where the OwnCloudClient is being created.
+     * @return          A OwnCloudClient object ready to be used
+     */
+    public static OwnCloudClient createOwnCloudClient(Uri uri, Context context,
+                                                      boolean followRedirects) {
+        OwnCloudClient client = new OwnCloudClient(uri);
+
+        client.setFollowRedirects(followRedirects);
+
+        client.setContext(context);
+        
+        return client;
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/OwnCloudClientManager.java

@@ -0,0 +1,54 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *   
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *   
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *   
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common;
+
+import java.io.IOException;
+
+import android.accounts.AuthenticatorException;
+import android.accounts.OperationCanceledException;
+import android.content.Context;
+
+import com.owncloud.android.lib.common.accounts.AccountUtils.AccountNotFoundException;
+
+/**
+ * Manager to create and reuse OwnCloudClient instances to access remote OC servers. 
+ * 
+ * @author David A. Velasco
+ * @author masensio
+ * @author Christian Schabesberger
+ */
+
+public interface OwnCloudClientManager {
+
+	OwnCloudClient getClientFor(OwnCloudAccount account, Context context) throws AccountNotFoundException,
+			OperationCanceledException, AuthenticatorException,
+            IOException;
+    
+    OwnCloudClient removeClientFor(OwnCloudAccount account);
+
+    void saveAllClients(Context context, String accountType)
+			throws AccountNotFoundException, AuthenticatorException, 
+			IOException, OperationCanceledException;
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/OwnCloudClientManagerFactory.java

@@ -0,0 +1,103 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2016 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+package com.owncloud.android.lib.common;
+
+public class OwnCloudClientManagerFactory {
+
+    public static enum Policy {
+        ALWAYS_NEW_CLIENT,
+        SINGLE_SESSION_PER_ACCOUNT,
+        SINGLE_SESSION_PER_ACCOUNT_IF_SERVER_SUPPORTS_SERVER_MONITORING
+    }
+
+    private static Policy sDefaultPolicy = Policy.ALWAYS_NEW_CLIENT;
+
+    private static OwnCloudClientManager sDefaultSingleton;
+
+    private static String sUserAgent;
+
+    public static OwnCloudClientManager newDefaultOwnCloudClientManager() {
+        return newOwnCloudClientManager(sDefaultPolicy);
+    }
+
+    public static OwnCloudClientManager newOwnCloudClientManager(Policy policy) {
+        switch (policy) {
+            case ALWAYS_NEW_CLIENT:
+                return new SimpleFactoryManager();
+
+            case SINGLE_SESSION_PER_ACCOUNT:
+                return new SingleSessionManager();
+
+            case SINGLE_SESSION_PER_ACCOUNT_IF_SERVER_SUPPORTS_SERVER_MONITORING:
+                return new DynamicSessionManager();
+
+            default:
+                throw new IllegalArgumentException("Unknown policy");
+        }
+    }
+
+    public static OwnCloudClientManager getDefaultSingleton() {
+        if (sDefaultSingleton == null) {
+            sDefaultSingleton = newDefaultOwnCloudClientManager();
+        }
+        return sDefaultSingleton;
+    }
+
+    public static Policy getDefaultPolicy() {
+        return sDefaultPolicy;
+    }
+
+    public static void setDefaultPolicy(Policy policy) {
+        if (policy == null) {
+            throw new IllegalArgumentException("Default policy cannot be NULL");
+        }
+        if (defaultSingletonMustBeUpdated(policy)) {
+            sDefaultSingleton = null;
+        }
+        sDefaultPolicy = policy;
+    }
+
+    public static void setUserAgent(String userAgent) {
+        sUserAgent = userAgent;
+    }
+
+    public static String getUserAgent() {
+        return sUserAgent;
+    }
+
+    private static boolean defaultSingletonMustBeUpdated(Policy policy) {
+        if (sDefaultSingleton == null) {
+            return false;
+        }
+        if (policy == Policy.ALWAYS_NEW_CLIENT &&
+            !(sDefaultSingleton instanceof SimpleFactoryManager)) {
+            return true;
+        }
+        if (policy == Policy.SINGLE_SESSION_PER_ACCOUNT &&
+            !(sDefaultSingleton instanceof SingleSessionManager)) {
+            return true;
+        }
+        return false;
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/SimpleFactoryManager.java

@@ -0,0 +1,81 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2016 ownCloud GmbH.
+ *   
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *   
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *   
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common;
+
+
+import android.accounts.AuthenticatorException;
+import android.accounts.OperationCanceledException;
+import android.content.Context;
+
+import com.owncloud.android.lib.common.accounts.AccountUtils;
+import com.owncloud.android.lib.common.accounts.AccountUtils.AccountNotFoundException;
+import com.owncloud.android.lib.common.utils.Log_OC;
+
+import java.io.IOException;
+
+public class SimpleFactoryManager implements OwnCloudClientManager {
+
+    private static final String TAG = SimpleFactoryManager.class.getSimpleName();
+
+    @Override
+    public OwnCloudClient getClientFor(OwnCloudAccount account, Context context) throws
+            OperationCanceledException, AuthenticatorException, IOException {
+
+        Log_OC.d(TAG, "getClientFor(OwnCloudAccount ... : ");
+
+        OwnCloudClient client = OwnCloudClientFactory.createOwnCloudClient(
+            account.getBaseUri(),
+            context.getApplicationContext(),
+            true);
+
+        Log_OC.v(TAG, "    new client {" +
+            (account.getName() != null ?
+                account.getName() :
+                AccountUtils.buildAccountName(account.getBaseUri(), "")
+
+            ) + ", " + client.hashCode() + "}");
+
+        if (account.getCredentials() == null) {
+            account.loadCredentials(context);
+        }
+        client.setCredentials(account.getCredentials());
+        client.setAccount(account);
+        client.setContext(context);
+        client.setOwnCloudClientManager(this);
+        return client;
+    }
+
+    @Override
+    public OwnCloudClient removeClientFor(OwnCloudAccount account) {
+        // nothing to do - not taking care of tracking instances!
+        return null;
+    }
+
+    @Override
+    public void saveAllClients(Context context, String accountType) {
+        // nothing to do - not taking care of tracking instances!
+    }
+
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/SingleSessionManager.java

@@ -0,0 +1,238 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *   
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *   
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *   
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common;
+
+import android.accounts.Account;
+import android.accounts.AccountManager;
+import android.accounts.AuthenticatorException;
+import android.accounts.OperationCanceledException;
+import android.content.Context;
+import android.net.Uri;
+import android.util.Log;
+
+import com.owncloud.android.lib.common.accounts.AccountUtils;
+import com.owncloud.android.lib.common.authentication.OwnCloudSamlSsoCredentials;
+import com.owncloud.android.lib.common.utils.Log_OC;
+
+import java.io.IOException;
+import java.util.Iterator;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+
+/**
+ * Implementation of {@link OwnCloudClientManager}
+ *
+ * TODO check multithreading safety
+ *
+ * @author David A. Velasco
+ * @author masensio
+ * @author Christian Schabesberger
+ * @author David González Verdugo
+ */
+
+public class SingleSessionManager implements OwnCloudClientManager {
+
+    private static final String TAG = SingleSessionManager.class.getSimpleName();
+
+    private ConcurrentMap<String, OwnCloudClient> mClientsWithKnownUsername =
+        new ConcurrentHashMap<>();
+
+    private ConcurrentMap<String, OwnCloudClient> mClientsWithUnknownUsername =
+        new ConcurrentHashMap<>();
+
+
+    @Override
+    public OwnCloudClient getClientFor(OwnCloudAccount account, Context context) throws OperationCanceledException,
+            AuthenticatorException, IOException {
+
+        if (Log.isLoggable(TAG, Log.DEBUG)) {
+            Log_OC.d(TAG, "getClientFor starting ");
+        }
+        if (account == null) {
+            throw new IllegalArgumentException("Cannot get an OwnCloudClient for a null account");
+        }
+
+        OwnCloudClient client = null;
+        String accountName = account.getName();
+        String sessionName = account.getCredentials() == null ? "" :
+            AccountUtils.buildAccountName(
+                account.getBaseUri(),
+                account.getCredentials().getAuthToken());
+
+        if (accountName != null) {
+            client = mClientsWithKnownUsername.get(accountName);
+        }
+        boolean reusingKnown = false;    // just for logs
+        if (client == null) {
+            if (accountName != null) {
+                client = mClientsWithUnknownUsername.remove(sessionName);
+                if (client != null) {
+                    if (Log.isLoggable(TAG, Log.VERBOSE)) {
+                        Log_OC.v(TAG, "reusing client for session " + sessionName);
+                    }
+                    mClientsWithKnownUsername.put(accountName, client);
+                    if (Log.isLoggable(TAG, Log.VERBOSE)) {
+                        Log_OC.v(TAG, "moved client to account " + accountName);
+                    }
+                }
+            } else {
+                client = mClientsWithUnknownUsername.get(sessionName);
+            }
+        } else {
+            if (Log.isLoggable(TAG, Log.VERBOSE)) {
+                Log_OC.v(TAG, "reusing client for account " + accountName);
+            }
+            reusingKnown = true;
+        }
+
+        if (client == null) {
+            // no client to reuse - create a new one
+            client = OwnCloudClientFactory.createOwnCloudClient(
+                account.getBaseUri(),
+                context.getApplicationContext(),
+                true);    // TODO remove dependency on OwnCloudClientFactory
+            client.setAccount(account);
+            client.setContext(context);
+            client.setOwnCloudClientManager(this);
+
+            account.loadCredentials(context);
+            client.setCredentials(account.getCredentials());
+
+            if (client.getCredentials() instanceof OwnCloudSamlSsoCredentials) {
+                client.disableAutomaticCookiesHandling();
+            }
+
+            if (accountName != null) {
+                mClientsWithKnownUsername.put(accountName, client);
+                if (Log.isLoggable(TAG, Log.VERBOSE)) {
+                    Log_OC.v(TAG, "new client for account " + accountName);
+                }
+
+            } else {
+                mClientsWithUnknownUsername.put(sessionName, client);
+                if (Log.isLoggable(TAG, Log.VERBOSE)) {
+                    Log_OC.v(TAG, "new client for session " + sessionName);
+                }
+            }
+        } else {
+            if (!reusingKnown && Log.isLoggable(TAG, Log.VERBOSE)) {
+                Log_OC.v(TAG, "reusing client for session " + sessionName);
+            }
+
+            keepCredentialsUpdated(client);
+            keepCookiesUpdated(context, account, client);
+            keepUriUpdated(account, client);
+        }
+
+        if (Log.isLoggable(TAG, Log.DEBUG)) {
+            Log_OC.d(TAG, "getClientFor finishing ");
+        }
+        return client;
+    }
+
+
+    @Override
+    public OwnCloudClient removeClientFor(OwnCloudAccount account) {
+        if (Log.isLoggable(TAG, Log.DEBUG)) {
+            Log_OC.d(TAG, "removeClientFor starting ");
+        }
+
+        if (account == null) {
+            return null;
+        }
+
+        OwnCloudClient client;
+        String accountName = account.getName();
+        if (accountName != null) {
+            client = mClientsWithKnownUsername.remove(accountName);
+            if (client != null) {
+                if (Log.isLoggable(TAG, Log.VERBOSE)) {
+                    Log_OC.v(TAG, "Removed client for account " + accountName);
+                }
+                return client;
+            } else {
+                if (Log.isLoggable(TAG, Log.VERBOSE)) {
+                    Log_OC.v(TAG, "No client tracked for  account " + accountName);
+                }
+            }
+        }
+
+        mClientsWithUnknownUsername.clear();
+
+        if (Log.isLoggable(TAG, Log.DEBUG)) {
+            Log_OC.d(TAG, "removeClientFor finishing ");
+        }
+        return null;
+    }
+
+
+    @Override
+    public void saveAllClients(Context context, String accountType) {
+
+        if (Log.isLoggable(TAG, Log.DEBUG)) {
+            Log_OC.d(TAG, "Saving sessions... ");
+        }
+
+        Iterator<String> accountNames = mClientsWithKnownUsername.keySet().iterator();
+        String accountName;
+        Account account;
+        while (accountNames.hasNext()) {
+            accountName = accountNames.next();
+            account = new Account(accountName, accountType);
+            AccountUtils.saveClient(
+                mClientsWithKnownUsername.get(accountName),
+                account,
+                context);
+        }
+
+        if (Log.isLoggable(TAG, Log.DEBUG)) {
+            Log_OC.d(TAG, "All sessions saved");
+        }
+    }
+
+    private void keepCredentialsUpdated(OwnCloudClient reusedClient) {
+        reusedClient.applyCredentials();
+    }
+
+    private void keepCookiesUpdated(Context context, OwnCloudAccount account, OwnCloudClient reusedClient) {
+        AccountManager am = AccountManager.get(context.getApplicationContext());
+        if (am != null && account.getSavedAccount() != null) {
+            String recentCookies = am.getUserData(account.getSavedAccount(), AccountUtils.Constants.KEY_COOKIES);
+            String previousCookies = reusedClient.getCookiesString();
+            if (recentCookies != null && previousCookies != "" && !recentCookies.equals(previousCookies)) {
+                AccountUtils.restoreCookies(account.getSavedAccount(), reusedClient, context);
+            }
+        }
+    }
+
+    // this method is just a patch; we need to distinguish accounts in the same host but
+    // different paths; but that requires updating the accountNames for apps upgrading
+    private void keepUriUpdated(OwnCloudAccount account, OwnCloudClient reusedClient) {
+        Uri recentUri = account.getBaseUri();
+        if (!recentUri.equals(reusedClient.getBaseUri())) {
+            reusedClient.setBaseUri(recentUri);
+        }
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/accounts/AccountTypeUtils.java

@@ -0,0 +1,49 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2016 ownCloud GmbH.
+ *   
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *   
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *   
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.accounts;
+
+/**
+ * @author masensio
+ * @author David A. Velasco
+ */
+public class AccountTypeUtils {
+
+    public static String getAuthTokenTypePass(String accountType) {
+        return accountType + ".password";
+    }
+    
+    public static String getAuthTokenTypeAccessToken(String accountType) {
+        return accountType  + ".oauth2.access_token";
+    }
+    
+    public static String getAuthTokenTypeRefreshToken(String accountType) {
+        return accountType  + ".oauth2.refresh_token";
+    }
+    
+    public static String getAuthTokenTypeSamlSessionCookie(String accountType) {
+        return accountType  +  ".saml.web_sso.session_cookie";
+    }
+    
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/accounts/AccountUtils.java

@@ -0,0 +1,347 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *   Copyright (C) 2012  Bartek Przybylski
+ *   
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *   
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *   
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.accounts;
+
+import android.accounts.Account;
+import android.accounts.AccountManager;
+import android.accounts.AccountsException;
+import android.accounts.AuthenticatorException;
+import android.accounts.OperationCanceledException;
+import android.content.Context;
+import android.net.Uri;
+
+import com.owncloud.android.lib.common.OwnCloudClient;
+import com.owncloud.android.lib.common.authentication.OwnCloudCredentials;
+import com.owncloud.android.lib.common.authentication.OwnCloudCredentialsFactory;
+import com.owncloud.android.lib.common.utils.Log_OC;
+import com.owncloud.android.lib.resources.files.FileUtils;
+import com.owncloud.android.lib.resources.status.OwnCloudVersion;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import okhttp3.Cookie;
+
+public class AccountUtils {
+
+    private static final String TAG = AccountUtils.class.getSimpleName();
+
+    /**
+     * Constructs full url to host and webdav resource basing on host version
+     *
+     * @param context               Valid Android {@link Context}, needed to access the {@link AccountManager}
+     * @param account               A stored ownCloud {@link Account}
+     * @return                      Full URL to WebDAV endpoint in the server corresponding to 'account'.
+     * @throws AccountNotFoundException When 'account' is unknown for the AccountManager
+     */
+    public static String getWebDavUrlForAccount(Context context, Account account)
+        throws AccountNotFoundException {
+        String webDavUrlForAccount = "";
+
+        try {
+            OwnCloudCredentials ownCloudCredentials = getCredentialsForAccount(context, account);
+            webDavUrlForAccount = getBaseUrlForAccount(context, account) + OwnCloudClient.WEBDAV_FILES_PATH_4_0
+                    + ownCloudCredentials.getUsername();
+        } catch (OperationCanceledException e) {
+            e.printStackTrace();
+        } catch (AuthenticatorException e) {
+            e.printStackTrace();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        return webDavUrlForAccount;
+    }
+
+    /**
+     * Extracts url server from the account
+     *
+     * @param context               Valid Android {@link Context}, needed to access the {@link AccountManager}
+     * @param account               A stored ownCloud {@link Account}
+     * @return                      Full URL to the server corresponding to 'account', ending in the base path
+     *                              common to all API endpoints.
+     * @throws AccountNotFoundException When 'account' is unknown for the AccountManager
+     */
+    public static String getBaseUrlForAccount(Context context, Account account)
+        throws AccountNotFoundException {
+        AccountManager ama = AccountManager.get(context.getApplicationContext());
+        String baseurl = ama.getUserData(account, Constants.KEY_OC_BASE_URL);
+
+        if (baseurl == null)
+            throw new AccountNotFoundException(account, "Account not found", null);
+
+        return baseurl;
+    }
+
+    /**
+     * Get the username corresponding to an OC account.
+     *
+     * @param account An OC account
+     * @return Username for the given account, extracted from the account.name
+     */
+    public static String getUsernameForAccount(Account account) {
+        String username = null;
+        try {
+            username = account.name.substring(0, account.name.lastIndexOf('@'));
+        } catch (Exception e) {
+            Log_OC.e(TAG, "Couldn't get a username for the given account", e);
+        }
+        return username;
+    }
+
+    /**
+     * Get the stored server version corresponding to an OC account.
+     *
+     * @param account   An OC account
+     * @param context   Application context
+     * @return Version of the OC server, according to last check
+     */
+    public static OwnCloudVersion getServerVersionForAccount(Account account, Context context) {
+        AccountManager ama = AccountManager.get(context);
+        OwnCloudVersion version = null;
+        try {
+            String versionString = ama.getUserData(account, Constants.KEY_OC_VERSION);
+            version = new OwnCloudVersion(versionString);
+
+        } catch (Exception e) {
+            Log_OC.e(TAG, "Couldn't get a the server version for an account", e);
+        }
+        return version;
+    }
+
+    /**
+     * @return
+     * @throws IOException
+     * @throws AuthenticatorException
+     * @throws OperationCanceledException
+     */
+    public static OwnCloudCredentials getCredentialsForAccount(Context context, Account account)
+        throws OperationCanceledException, AuthenticatorException, IOException {
+
+        OwnCloudCredentials credentials;
+        AccountManager am = AccountManager.get(context);
+
+        String supportsOAuth2 = am.getUserData(account, AccountUtils.Constants.KEY_SUPPORTS_OAUTH2);
+        boolean isOauth2 = supportsOAuth2 != null && supportsOAuth2.equals("TRUE");
+
+        String supportsSamlSSo = am.getUserData(account,
+                AccountUtils.Constants.KEY_SUPPORTS_SAML_WEB_SSO);
+
+        boolean isSamlSso = supportsSamlSSo != null && supportsSamlSSo.equals("TRUE");
+
+        String username = AccountUtils.getUsernameForAccount(account);
+        OwnCloudVersion version = new OwnCloudVersion(am.getUserData(account, Constants.KEY_OC_VERSION));
+
+        if (isOauth2) {
+            String accessToken = am.blockingGetAuthToken(
+                account,
+                AccountTypeUtils.getAuthTokenTypeAccessToken(account.type),
+                false);
+
+            credentials = OwnCloudCredentialsFactory.newBearerCredentials(username, accessToken);
+
+        } else if (isSamlSso) {
+            String accessToken = am.blockingGetAuthToken(
+                account,
+                AccountTypeUtils.getAuthTokenTypeSamlSessionCookie(account.type),
+                false);
+
+            credentials = OwnCloudCredentialsFactory.newSamlSsoCredentials(username, accessToken);
+
+        } else {
+            String password = am.blockingGetAuthToken(
+                account,
+                AccountTypeUtils.getAuthTokenTypePass(account.type),
+                false);
+
+            credentials = OwnCloudCredentialsFactory.newBasicCredentials(
+                username,
+                password,
+                version.isPreemptiveAuthenticationPreferred()
+            );
+        }
+
+        return credentials;
+    }
+
+    /**
+     * Get the user id corresponding to an OC account.
+     * @param account ownCloud account
+     * @return        user id
+     */
+    public static String getUserId(Account account, Context context) {
+        AccountManager accountMgr = AccountManager.get(context);
+        return accountMgr.getUserData(account, Constants.KEY_ID);
+    }
+
+    public static String buildAccountNameOld(Uri serverBaseUrl, String username) {
+        if (serverBaseUrl.getScheme() == null) {
+            serverBaseUrl = Uri.parse("https://" + serverBaseUrl.toString());
+        }
+        String accountName = username + "@" + serverBaseUrl.getHost();
+        if (serverBaseUrl.getPort() >= 0) {
+            accountName += ":" + serverBaseUrl.getPort();
+        }
+        return accountName;
+    }
+
+    public static String buildAccountName(Uri serverBaseUrl, String username) {
+        if (serverBaseUrl.getScheme() == null) {
+            serverBaseUrl = Uri.parse("https://" + serverBaseUrl.toString());
+        }
+
+        // Remove http:// or https://
+        String url = serverBaseUrl.toString();
+        if (url.contains("://")) {
+            url = url.substring(serverBaseUrl.toString().indexOf("://") + 3);
+        }
+        String accountName = username + "@" + url;
+
+        return accountName;
+    }
+
+    public static void saveClient(OwnCloudClient client, Account savedAccount, Context context) {
+        // Account Manager
+        AccountManager ac = AccountManager.get(context.getApplicationContext());
+
+        if (client != null) {
+            String cookiesString = client.getCookiesString();
+            if (!"".equals(cookiesString)) {
+                ac.setUserData(savedAccount, Constants.KEY_COOKIES, cookiesString);
+                 Log_OC.d(TAG, "Saving Cookies: "+ cookiesString );
+            }
+        }
+    }
+
+    /**
+     * Restore the client cookies persisted in an account stored in the system AccountManager.
+     *
+     * @param account           Stored account.
+     * @param client            Client to restore cookies in.
+     * @param context           Android context used to access the system AccountManager.
+     */
+    public static void restoreCookies(Account account, OwnCloudClient client, Context context) {
+        if (account == null) {
+            Log_OC.d(TAG, "Cannot restore cookie for null account");
+
+        } else {
+            Log_OC.d(TAG, "Restoring cookies for " + account.name);
+
+            // Account Manager
+            AccountManager am = AccountManager.get(context.getApplicationContext());
+
+            Uri serverUri = (client.getBaseUri() != null) ? client.getBaseUri() : client.getUserFilesWebDavUri();
+
+            String cookiesString = am.getUserData(account, Constants.KEY_COOKIES);
+            if (cookiesString != null) {
+                String[] rawCookies = cookiesString.split(";");
+                List<Cookie> cookieList = new ArrayList<>(rawCookies.length);
+                for(String rawCookie : rawCookies) {
+                    rawCookie = rawCookie.replace(" ", "");
+                    final int equalPos = rawCookie.indexOf('=');
+                    if (equalPos == -1) continue;
+                    cookieList.add(new Cookie.Builder()
+                            .name(rawCookie.substring(0, equalPos))
+                            .value(rawCookie.substring(equalPos + 1))
+                            .domain(serverUri.getHost())
+                            .path(
+                                    serverUri.getPath().equals("")
+                                            ? FileUtils.PATH_SEPARATOR
+                                            : serverUri.getPath()
+                            )
+                            .build());
+                }
+                client.setCookiesForCurrentAccount(cookieList);
+            }
+        }
+    }
+
+    public static class AccountNotFoundException extends AccountsException {
+
+        /**
+         * Generated - should be refreshed every time the class changes!!
+         */
+        private static final long serialVersionUID = -1684392454798508693L;
+
+        private Account mFailedAccount;
+
+        public AccountNotFoundException(Account failedAccount, String message, Throwable cause) {
+            super(message, cause);
+            mFailedAccount = failedAccount;
+        }
+
+        public Account getFailedAccount() {
+            return mFailedAccount;
+        }
+    }
+
+    public static class Constants {
+        /**
+         * Version should be 3 numbers separated by dot so it can be parsed by
+         * {@link OwnCloudVersion}
+         */
+        public static final String KEY_OC_VERSION = "oc_version";
+        /**
+         * Base url should point to owncloud installation without trailing / ie:
+         * http://server/path or https://owncloud.server
+         */
+        public static final String KEY_OC_BASE_URL = "oc_base_url";
+        /**
+         * Flag signaling if the ownCloud server can be accessed with OAuth2 access tokens.
+         */
+        public static final String KEY_SUPPORTS_OAUTH2 = "oc_supports_oauth2";
+        /**
+         * Flag signaling if the ownCloud server can be accessed with session cookies from SAML-based web single-sign-on.
+         */
+        public static final String KEY_SUPPORTS_SAML_WEB_SSO = "oc_supports_saml_web_sso";
+        /**
+         * OC account cookies
+         */
+        public static final String KEY_COOKIES = "oc_account_cookies";
+
+        /**
+         * OC account version
+         */
+        public static final String KEY_OC_ACCOUNT_VERSION = "oc_account_version";
+
+        /**
+         * User's id
+         */
+        public static final String KEY_ID = "oc_id";
+
+        /**
+         * User's display name
+         */
+        public static final String KEY_DISPLAY_NAME = "oc_display_name";
+
+        /**
+         * OAuth2 refresh token
+         **/
+        public static final String KEY_OAUTH2_REFRESH_TOKEN = "oc_oauth2_refresh_token";
+
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/authentication/OwnCloudBasicCredentials.java

@@ -0,0 +1,78 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+package com.owncloud.android.lib.common.authentication;
+
+import com.owncloud.android.lib.common.OwnCloudClient;
+import com.owncloud.android.lib.common.http.HttpClient;
+import com.owncloud.android.lib.common.http.HttpConstants;
+
+import okhttp3.Credentials;
+
+public class OwnCloudBasicCredentials implements OwnCloudCredentials {
+
+    private static final String TAG = OwnCloudCredentials.class.getSimpleName();
+
+    private String mUsername;
+    private String mPassword;
+
+    public OwnCloudBasicCredentials(String username, String password) {
+        mUsername = username != null ? username : "";
+        mPassword = password != null ? password : "";
+    }
+
+    public OwnCloudBasicCredentials(String username, String password, boolean preemptiveMode) {
+        mUsername = username != null ? username : "";
+        mPassword = password != null ? password : "";
+    }
+
+    @Override
+    public void applyTo(OwnCloudClient client) {
+        // Clear previous basic credentials
+        HttpClient.deleteHeaderForAllRequests(HttpConstants.AUTHORIZATION_HEADER);
+        HttpClient.deleteHeaderForAllRequests(HttpConstants.COOKIE_HEADER);
+
+        HttpClient.addHeaderForAllRequests(HttpConstants.AUTHORIZATION_HEADER,
+                Credentials.basic(mUsername, mPassword));
+    }
+
+    @Override
+    public String getUsername() {
+        return mUsername;
+    }
+
+    @Override
+    public String getAuthToken() {
+        return mPassword;
+    }
+
+    @Override
+    public boolean authTokenExpires() {
+        return false;
+    }
+
+    @Override
+    public boolean authTokenCanBeRefreshed() {
+        return false;
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/authentication/OwnCloudBearerCredentials.java

@@ -0,0 +1,70 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+package com.owncloud.android.lib.common.authentication;
+
+import com.owncloud.android.lib.common.OwnCloudClient;
+import com.owncloud.android.lib.common.http.HttpClient;
+import com.owncloud.android.lib.common.http.HttpConstants;
+
+public class OwnCloudBearerCredentials implements OwnCloudCredentials {
+
+    private String mUsername;
+    private String mAccessToken;
+
+    public OwnCloudBearerCredentials(String username, String accessToken) {
+        mUsername = username != null ? username : "";
+        mAccessToken = accessToken != null ? accessToken : "";
+    }
+
+    @Override
+    public void applyTo(OwnCloudClient client) {
+        // Clear previous credentials
+        HttpClient.deleteHeaderForAllRequests(HttpConstants.AUTHORIZATION_HEADER);
+        HttpClient.deleteHeaderForAllRequests(HttpConstants.COOKIE_HEADER);
+
+        HttpClient.addHeaderForAllRequests(HttpConstants.AUTHORIZATION_HEADER,
+                HttpConstants.BEARER_AUTHORIZATION_KEY + mAccessToken);
+    }
+
+    @Override
+    public String getUsername() {
+        // not relevant for authentication, but relevant for informational purposes
+        return mUsername;
+    }
+
+    @Override
+    public String getAuthToken() {
+        return mAccessToken;
+    }
+
+    @Override
+    public boolean authTokenExpires() {
+        return true;
+    }
+
+    @Override
+    public boolean authTokenCanBeRefreshed() {
+        return true;
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/authentication/OwnCloudCredentials.java

@@ -0,0 +1,40 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2016 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.authentication;
+
+import com.owncloud.android.lib.common.OwnCloudClient;
+
+public interface OwnCloudCredentials {
+
+    void applyTo(OwnCloudClient ownCloudClient);
+
+    String getUsername();
+
+    String getAuthToken();
+
+    boolean authTokenExpires();
+
+    boolean authTokenCanBeRefreshed();
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/authentication/OwnCloudCredentialsFactory.java

@@ -0,0 +1,95 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.authentication;
+
+import com.owncloud.android.lib.common.OwnCloudClient;
+import com.owncloud.android.lib.common.http.HttpClient;
+import com.owncloud.android.lib.common.http.HttpConstants;
+
+public class OwnCloudCredentialsFactory {
+
+    public static final String CREDENTIAL_CHARSET = "UTF-8";
+
+    private static OwnCloudAnonymousCredentials sAnonymousCredentials;
+
+    public static OwnCloudCredentials newBasicCredentials(String username, String password) {
+        return new OwnCloudBasicCredentials(username, password);
+    }
+
+    public static OwnCloudCredentials newBasicCredentials(
+        String username, String password, boolean preemptiveMode
+    ) {
+        return new OwnCloudBasicCredentials(username, password, preemptiveMode);
+    }
+
+    public static OwnCloudCredentials newBearerCredentials(String username, String authToken) {
+        return new OwnCloudBearerCredentials(username, authToken);
+    }
+
+    public static OwnCloudCredentials newSamlSsoCredentials(String username, String sessionCookie) {
+        return new OwnCloudSamlSsoCredentials(username, sessionCookie);
+    }
+
+    public static final OwnCloudCredentials getAnonymousCredentials() {
+        if (sAnonymousCredentials == null) {
+            sAnonymousCredentials = new OwnCloudAnonymousCredentials();
+        }
+        return sAnonymousCredentials;
+    }
+
+    public static final class OwnCloudAnonymousCredentials implements OwnCloudCredentials {
+
+        protected OwnCloudAnonymousCredentials() {
+        }
+
+        @Override
+        public void applyTo(OwnCloudClient client) {
+            // Clear previous basic credentials
+            HttpClient.deleteHeaderForAllRequests(HttpConstants.AUTHORIZATION_HEADER);
+            HttpClient.deleteHeaderForAllRequests(HttpConstants.COOKIE_HEADER);
+        }
+
+        @Override
+        public String getAuthToken() {
+            return "";
+        }
+
+        @Override
+        public boolean authTokenExpires() {
+            return false;
+        }
+
+        @Override
+        public boolean authTokenCanBeRefreshed() {
+            return false;
+        }
+
+        @Override
+        public String getUsername() {
+            // no user name
+            return null;
+        }
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/authentication/OwnCloudSamlSsoCredentials.java

@@ -0,0 +1,70 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+package com.owncloud.android.lib.common.authentication;
+
+import com.owncloud.android.lib.common.OwnCloudClient;
+import com.owncloud.android.lib.common.http.HttpClient;
+import com.owncloud.android.lib.common.http.HttpConstants;
+
+public class OwnCloudSamlSsoCredentials implements OwnCloudCredentials {
+
+    private String mUsername;
+    private String mSessionCookie;
+
+    public OwnCloudSamlSsoCredentials(String username, String sessionCookie) {
+        mUsername = username != null ? username : "";
+        mSessionCookie = sessionCookie != null ? sessionCookie : "";
+    }
+
+    @Override
+    public void applyTo(OwnCloudClient client) {
+        // Clear previous credentials
+        HttpClient.deleteHeaderForAllRequests(HttpConstants.AUTHORIZATION_HEADER);
+        HttpClient.deleteHeaderForAllRequests(HttpConstants.COOKIE_HEADER);
+
+        HttpClient.addHeaderForAllRequests(HttpConstants.COOKIE_HEADER, mSessionCookie);
+        client.setFollowRedirects(false);
+    }
+
+    @Override
+    public String getUsername() {
+        // not relevant for authentication, but relevant for informational purposes
+        return mUsername;
+    }
+
+    @Override
+    public String getAuthToken() {
+        return mSessionCookie;
+    }
+
+    @Override
+    public boolean authTokenExpires() {
+        return true;
+    }
+
+    @Override
+    public boolean authTokenCanBeRefreshed() {
+        return false;
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/authentication/oauth/BearerCredentials.java

@@ -0,0 +1,98 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *   
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *   
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *   
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.authentication.oauth;
+
+/**
+ * @author David A. Velasco
+ * @author Christian Schabesberger
+ */
+public class BearerCredentials {
+
+    public static final int HASH_SEED = 17;
+    public static final int HASH_OFFSET = 37;
+    
+    private String mAccessToken;
+    
+    
+    /**
+     * The constructor with the bearer token
+     *
+     * @param token     The bearer token
+     */
+    public BearerCredentials(String token) {
+        /*if (token == null) {
+            throw new IllegalArgumentException("Bearer token may not be null");            
+        }*/
+        mAccessToken = (token == null) ? "" : token;
+    }
+
+
+    /**
+     * Returns the access token
+     *
+     * @return      The access token
+     */
+    public String getAccessToken() {
+        return mAccessToken;
+    }
+
+
+    /**
+     * Get this object string.
+     *
+     * @return  The access token
+     */
+    public String toString() {
+        return mAccessToken;
+    }
+
+    /**
+     * Does a hash of the access token.
+     *
+     * @return The hash code of the access token
+     */
+    public int hashCode() {
+       return HASH_SEED * HASH_OFFSET + mAccessToken.hashCode();
+    }
+
+    /**
+     * These credentials are assumed equal if accessToken is the same.
+     *
+     * @param   o   The other object to compare with.
+     *
+     * @return      'True' if the object is equivalent.
+     */
+    public boolean equals(Object o) {
+        if (o == null) return false;
+        if (this == o) return true;
+        if (this.getClass().equals(o.getClass())) {
+            BearerCredentials that = (BearerCredentials) o;
+            if (mAccessToken.equals(that.mAccessToken)) {
+                return true;
+            }
+        }
+        return false;
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/authentication/oauth/OAuth2ClientConfiguration.java

@@ -0,0 +1,66 @@
+/* ownCloud Android Library is available under MIT license
+ *
+ *   @author David A. Velasco
+ *   Copyright (C) 2017 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.authentication.oauth;
+
+public class OAuth2ClientConfiguration {
+
+    private String mClientId;
+
+    private String mClientSecret;
+
+    private String mRedirectUri;
+
+    public OAuth2ClientConfiguration(String clientId, String clientSecret, String redirectUri) {
+        mClientId = (clientId == null) ? "" : clientId;
+        mClientSecret = (clientSecret == null) ? "" : clientSecret;
+        mRedirectUri = (redirectUri == null) ? "" : redirectUri;
+    }
+
+    public String getClientId() {
+        return mClientId;
+    }
+
+    public void setClientId(String clientId) {
+        mClientId = (clientId == null) ? "" : clientId;
+    }
+
+    public String getClientSecret() {
+        return mClientSecret;
+    }
+
+    public void setClientSecret(String clientSecret) {
+        mClientSecret = (clientSecret == null) ? "" : clientSecret;
+    }
+
+    public String getRedirectUri() {
+        return mRedirectUri;
+    }
+
+    public void setRedirectUri(String redirectUri) {
+        this.mRedirectUri = (redirectUri == null) ? "" : redirectUri;
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/authentication/oauth/OAuth2Constants.java

@@ -0,0 +1,68 @@
+/* ownCloud Android Library is available under MIT license
+ *
+ *   @author David A. Velasco
+ *   Copyright (C) 2017 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.authentication.oauth;
+
+/** 
+ * Constant values for OAuth 2 protocol.
+ * 
+ * Includes required and optional parameter NAMES used in the 'authorization code' grant type.
+ */
+
+public class OAuth2Constants {
+    
+    /// Parameters to send to the Authorization Endpoint
+    public static final String KEY_RESPONSE_TYPE = "response_type";
+    public static final String KEY_REDIRECT_URI = "redirect_uri";
+    public static final String KEY_CLIENT_ID = "client_id";
+    public static final String KEY_SCOPE = "scope";
+    public static final String KEY_STATE = "state"; 
+    
+    /// Additional parameters to send to the Token Endpoint
+    public static final String KEY_GRANT_TYPE = "grant_type";
+    public static final String KEY_CODE = "code";
+
+    // Used to get the Access Token using Refresh Token
+    public static final String OAUTH2_REFRESH_TOKEN_GRANT_TYPE = "refresh_token";
+    
+    /// Parameters received in an OK response from the Token Endpoint 
+    public static final String KEY_ACCESS_TOKEN = "access_token";
+    public static final String KEY_TOKEN_TYPE = "token_type";
+    public static final String KEY_EXPIRES_IN = "expires_in";
+    public static final String KEY_REFRESH_TOKEN = "refresh_token";
+    
+    /// Parameters in an ERROR response
+    public static final String KEY_ERROR = "error";
+    public static final String KEY_ERROR_DESCRIPTION = "error_description";
+    public static final String KEY_ERROR_URI = "error_uri";
+    public static final String VALUE_ERROR_ACCESS_DENIED = "access_denied";
+
+    /// Extra not standard
+    public static final String KEY_USER_ID = "user_id";
+
+    /// Depends on oauth2 grant type
+    public static final String OAUTH2_RESPONSE_TYPE_CODE = "code";
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/authentication/oauth/OAuth2GetAccessTokenOperation.java

@@ -0,0 +1,146 @@
+/* ownCloud Android Library is available under MIT license
+ *
+ *   @author David A. Velasco
+ *   @author Christian Schabesberger
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.authentication.oauth;
+
+import android.net.Uri;
+
+import com.owncloud.android.lib.common.authentication.OwnCloudBasicCredentials;
+import com.owncloud.android.lib.common.OwnCloudClient;
+import com.owncloud.android.lib.common.authentication.OwnCloudCredentials;
+import com.owncloud.android.lib.common.http.methods.nonwebdav.PostMethod;
+import com.owncloud.android.lib.common.operations.RemoteOperationResult.ResultCode;
+import com.owncloud.android.lib.common.operations.RemoteOperation;
+import com.owncloud.android.lib.common.operations.RemoteOperationResult;
+
+import org.json.JSONObject;
+
+import java.net.URL;
+import java.util.Map;
+
+import okhttp3.MultipartBody;
+import okhttp3.RequestBody;
+
+
+public class OAuth2GetAccessTokenOperation extends RemoteOperation<Map<String, String>> {
+    
+    private String mGrantType;
+    private String mCode;
+    private String mClientId;
+    private String mClientSecret;
+    private String mRedirectUri;
+    private final String mAccessTokenEndpointPath;
+
+    private final OAuth2ResponseParser mResponseParser;
+
+
+    public OAuth2GetAccessTokenOperation(
+        String grantType,
+        String code,
+        String clientId,
+        String secretId,
+        String redirectUri,
+        String accessTokenEndpointPath
+    ) {
+        mClientId = clientId;
+        mClientSecret = secretId;
+        mRedirectUri = redirectUri;
+        mGrantType = grantType;
+        mCode = code;
+
+        mAccessTokenEndpointPath =
+            accessTokenEndpointPath != null ?
+                accessTokenEndpointPath :
+                OwnCloudOAuth2Provider.ACCESS_TOKEN_ENDPOINT_PATH
+        ;
+
+        mResponseParser = new OAuth2ResponseParser();
+    }
+
+    @Override
+    protected RemoteOperationResult run(OwnCloudClient client) {
+        RemoteOperationResult<Map<String, String>> result = null;
+        
+        try {
+
+            final RequestBody requestBody = new MultipartBody.Builder()
+                    .setType(MultipartBody.FORM)
+                    .addFormDataPart(OAuth2Constants.KEY_GRANT_TYPE, mGrantType)
+                    .addFormDataPart(OAuth2Constants.KEY_CODE, mCode)
+                    .addFormDataPart(OAuth2Constants.KEY_REDIRECT_URI, mRedirectUri)
+                    .addFormDataPart(OAuth2Constants.KEY_CLIENT_ID, mClientId)
+                    .build();
+
+            Uri.Builder uriBuilder = client.getBaseUri().buildUpon();
+            uriBuilder.appendEncodedPath(mAccessTokenEndpointPath);
+
+            final PostMethod postMethod = new PostMethod(new URL(
+                    client.getBaseUri().buildUpon()
+                            .appendEncodedPath(mAccessTokenEndpointPath)
+                            .build()
+                            .toString()));
+
+            postMethod.setRequestBody(requestBody);
+
+            OwnCloudCredentials oauthCredentials =
+                    new OwnCloudBasicCredentials(mClientId, mClientSecret);
+            OwnCloudCredentials oldCredentials = switchClientCredentials(oauthCredentials);
+            client.executeHttpMethod(postMethod);
+            switchClientCredentials(oldCredentials);
+
+            String response = postMethod.getResponseBodyAsString();
+            if (response != null && response.length() > 0) {
+                JSONObject tokenJson = new JSONObject(response);
+                Map<String, String> accessTokenResult =
+                    mResponseParser.parseAccessTokenResult(tokenJson);
+                if (accessTokenResult.get(OAuth2Constants.KEY_ERROR) != null ||
+                        accessTokenResult.get(OAuth2Constants.KEY_ACCESS_TOKEN) == null) {
+                    result = new RemoteOperationResult<>(ResultCode.OAUTH2_ERROR);
+
+                } else {
+                    result = new RemoteOperationResult<>(ResultCode.OK);
+                    result.setData(accessTokenResult);
+                }
+
+            } else {
+                result = new RemoteOperationResult<>(ResultCode.OK);
+                client.exhaustResponse(postMethod.getResponseBodyAsStream());
+            }
+
+        } catch (Exception e) {
+            result = new RemoteOperationResult<>(e);
+            
+        }
+        return result;
+    }
+
+    private OwnCloudCredentials switchClientCredentials(OwnCloudCredentials newCredentials) {
+        OwnCloudCredentials previousCredentials = getClient().getCredentials();
+        getClient().setCredentials(newCredentials);
+        return previousCredentials;
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/authentication/oauth/OAuth2GrantType.java

@@ -0,0 +1,46 @@
+/* ownCloud Android Library is available under MIT license
+ *
+ *   @author David A. Velasco
+ *   Copyright (C) 2017 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.authentication.oauth;
+
+public enum OAuth2GrantType {
+    AUTHORIZATION_CODE("authorization_code"),
+    IMPLICIT("implicit"),
+    PASSWORD("password"),
+    CLIENT_CREDENTIAL("client_credentials"),
+    REFRESH_TOKEN("refresh_token")  // not a grant type conceptually, but used as such to refresh access tokens
+    ;
+
+    private String mValue;
+
+    OAuth2GrantType(String value) {
+        mValue = value;
+    }
+
+    public String getValue() {
+        return mValue;
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/authentication/oauth/OAuth2Provider.java

@@ -0,0 +1,66 @@
+/* ownCloud Android Library is available under MIT license
+ *
+ *   @author David A. Velasco
+ *   Copyright (C) 2017 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.authentication.oauth;
+
+public interface OAuth2Provider {
+
+    /**
+     * {@link OAuth2RequestBuilder} implementation for this provider.
+     *
+     * @return      {@link OAuth2RequestBuilder} implementation.
+     */
+    OAuth2RequestBuilder getOperationBuilder();
+
+
+    /**
+     * Set configuration of the client that will use this {@link OAuth2Provider}
+     * @param oAuth2ClientConfiguration     Configuration of the client that will use this {@link OAuth2Provider}
+     */
+    void setClientConfiguration(OAuth2ClientConfiguration oAuth2ClientConfiguration);
+
+    /**
+     * Configuration of the client that is using this {@link OAuth2Provider}
+     * return                   Configuration of the client that is usinng this {@link OAuth2Provider}
+     */
+    OAuth2ClientConfiguration getClientConfiguration();
+
+
+    /**
+     * Set base URI to authorization server.
+     *
+     * @param authorizationServerUri        Set base URL to authorization server.
+     */
+    void setAuthorizationServerUri(String authorizationServerUri);
+
+    /**
+     * base URI to authorization server.
+     *
+     * @return      Base URL to authorization server.
+     */
+    String getAuthorizationServerUri();
+
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/authentication/oauth/OAuth2ProvidersRegistry.java

@@ -0,0 +1,122 @@
+/* ownCloud Android Library is available under MIT license
+ *
+ *   @author David A. Velasco
+ *   Copyright (C) 2017 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.authentication.oauth;
+
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class OAuth2ProvidersRegistry {
+
+    private Map<String, OAuth2Provider> mProviders = new HashMap<>();
+
+    private OAuth2Provider mDefaultProvider = null;
+
+    private OAuth2ProvidersRegistry () {
+    }
+
+    /**
+     * See https://en.wikipedia.org/wiki/Initialization-on-demand_holder_idiom
+     */
+    private static class LazyHolder {
+        private static final OAuth2ProvidersRegistry INSTANCE = new OAuth2ProvidersRegistry();
+    }
+
+    /**
+     * Singleton accesor.
+     *
+     * @return     Singleton isntance of {@link OAuth2ProvidersRegistry}
+     */
+    public static OAuth2ProvidersRegistry getInstance() {
+        return LazyHolder.INSTANCE;
+    }
+
+    /**
+     * Register an {@link OAuth2Provider} with the name passed as parameter.
+     *
+     * @param name              Name to bind 'oAuthProvider' in the registry.
+     * @param oAuth2Provider    An {@link OAuth2Provider} instance to keep in the registry.
+     * @throws IllegalArgumentException if 'name' or 'oAuthProvider' are null.
+     */
+    public void registerProvider(String name, OAuth2Provider oAuth2Provider) {
+        if (name == null) {
+            throw new IllegalArgumentException("Name must not be NULL");
+        }
+        if (oAuth2Provider == null) {
+            throw new IllegalArgumentException("oAuth2Provider must not be NULL");
+        }
+
+        mProviders.put(name, oAuth2Provider);
+        if (mProviders.size() == 1) {
+            mDefaultProvider = oAuth2Provider;
+        }
+    }
+
+    public OAuth2Provider unregisterProvider(String name) {
+        OAuth2Provider unregisteredProvider = mProviders.remove(name);
+        if (mProviders.size() == 0) {
+            mDefaultProvider = null;
+        } else if (unregisteredProvider != null && unregisteredProvider == mDefaultProvider) {
+            mDefaultProvider = mProviders.values().iterator().next();
+        }
+        return unregisteredProvider;
+    }
+
+    /**
+     * Get default {@link OAuth2Provider}.
+     *
+     * @return      Default provider, or NULL if there is no provider.
+     */
+    public OAuth2Provider getProvider() {
+        return mDefaultProvider;
+    }
+
+    /**
+     * Get {@link OAuth2Provider} registered with the name passed as parameter.
+     *
+     * @param name  Name used to register the desired {@link OAuth2Provider}
+     * @return      {@link OAuth2Provider} registered with the name 'name'
+     */
+    public OAuth2Provider getProvider(String name) {
+        return mProviders.get(name);
+    }
+
+    /**
+     * Sets the {@link OAuth2Provider} registered with the name passed as parameter as the default provider
+     *
+     * @param name  Name used to register the {@link OAuth2Provider} to set as default.
+     * @return      {@link OAuth2Provider} set as default, or NULL if no provider was registered with 'name'.
+     */
+    public OAuth2Provider setDefaultProvider(String name) {
+        OAuth2Provider toDefault = mProviders.get(name);
+        if (toDefault != null) {
+            mDefaultProvider = toDefault;
+        }
+        return toDefault;
+    }
+
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/authentication/oauth/OAuth2QueryParser.java

@@ -0,0 +1,75 @@
+/* ownCloud Android Library is available under MIT license
+ *
+ *   @author David A. Velasco
+ *   Copyright (C) 2017 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.authentication.oauth;
+
+import com.owncloud.android.lib.common.utils.Log_OC;
+
+import java.util.HashMap;
+import java.util.Map;
+
+
+public class OAuth2QueryParser {
+
+    private static final String TAG = OAuth2QueryParser.class.getName();
+
+    private Map<String, String> mOAuth2ParsedAuthorizationResponse;
+
+    public OAuth2QueryParser() {
+        mOAuth2ParsedAuthorizationResponse = new HashMap<>();
+    }
+
+    public Map<String, String> parse(String query) {
+        mOAuth2ParsedAuthorizationResponse.clear();
+
+        if (query != null) {
+            String[] pairs = query.split("&");
+            int i = 0;
+            String key = "";
+            String value;
+            while (pairs.length > i) {
+                int j = 0;
+                String[] part = pairs[i].split("=");
+                while (part.length > j) {
+                    String p = part[j];
+                    if (j == 0) {
+                        key = p;
+                    } else if (j == 1) {
+                        value = p;
+                        mOAuth2ParsedAuthorizationResponse.put(key, value);
+                    }
+
+                    Log_OC.v(TAG, "[" + i + "," + j + "] = " + p);
+                    j++;
+                }
+                i++;
+            }
+        }
+
+        return mOAuth2ParsedAuthorizationResponse;
+    }
+
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/authentication/oauth/OAuth2RefreshAccessTokenOperation.java

@@ -0,0 +1,134 @@
+/**
+ *   ownCloud Android client application
+ *
+ *   @author David González Verdugo
+ *   @author Christian Schabesberger
+ *
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License version 2,
+ *   as published by the Free Software Foundation.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+package com.owncloud.android.lib.common.authentication.oauth;
+
+import android.net.Uri;
+
+import com.owncloud.android.lib.common.authentication.OwnCloudBasicCredentials;
+import com.owncloud.android.lib.common.OwnCloudClient;
+import com.owncloud.android.lib.common.authentication.OwnCloudCredentials;
+import com.owncloud.android.lib.common.operations.RemoteOperationResult.ResultCode;
+import com.owncloud.android.lib.common.operations.RemoteOperation;
+import com.owncloud.android.lib.common.operations.RemoteOperationResult;
+import com.owncloud.android.lib.common.utils.Log_OC;
+
+import org.json.JSONObject;
+
+import java.net.URL;
+import java.util.Map;
+
+import com.owncloud.android.lib.common.http.methods.nonwebdav.PostMethod;
+
+import okhttp3.MultipartBody;
+import okhttp3.RequestBody;
+
+public class OAuth2RefreshAccessTokenOperation extends RemoteOperation<Map<String, String>> {
+
+    private static final String TAG = OAuth2RefreshAccessTokenOperation.class.getSimpleName();
+
+    private String mClientId;
+    private String mClientSecret;
+    private String mRefreshToken;
+
+    private final String mAccessTokenEndpointPath;
+
+    private final OAuth2ResponseParser mResponseParser;
+
+    public OAuth2RefreshAccessTokenOperation(
+            String clientId,
+            String secretId,
+            String refreshToken,
+            String accessTokenEndpointPath
+    ) {
+
+        mClientId = clientId;
+        mClientSecret = secretId;
+        mRefreshToken = refreshToken;
+
+        mAccessTokenEndpointPath =
+                accessTokenEndpointPath != null ?
+                        accessTokenEndpointPath :
+                        OwnCloudOAuth2Provider.ACCESS_TOKEN_ENDPOINT_PATH
+        ;
+
+        mResponseParser = new OAuth2ResponseParser();
+    }
+
+    @Override
+    protected RemoteOperationResult<Map<String, String>> run(OwnCloudClient client) {
+
+        try {
+            final RequestBody requestBody = new MultipartBody.Builder()
+                    .setType(MultipartBody.FORM)
+                    .addFormDataPart(OAuth2Constants.KEY_GRANT_TYPE,
+                            OAuth2GrantType.REFRESH_TOKEN.getValue())
+                    .addFormDataPart(OAuth2Constants.KEY_CLIENT_ID, mClientId)
+                    .addFormDataPart(OAuth2Constants.KEY_REFRESH_TOKEN, mRefreshToken)
+                    .build();
+
+            Uri.Builder uriBuilder = client.getBaseUri().buildUpon();
+            uriBuilder.appendEncodedPath(mAccessTokenEndpointPath);
+
+            final PostMethod postMethod = new PostMethod(new URL(
+                    client.getBaseUri().buildUpon()
+                            .appendEncodedPath(mAccessTokenEndpointPath)
+                            .build()
+                            .toString()));
+            postMethod.setRequestBody(requestBody);
+
+            final OwnCloudCredentials oauthCredentials = new OwnCloudBasicCredentials(mClientId, mClientSecret);
+
+            final OwnCloudCredentials oldCredentials = switchClientCredentials(oauthCredentials);
+            client.executeHttpMethod(postMethod);
+            switchClientCredentials(oldCredentials);
+
+            final String responseData = postMethod.getResponseBodyAsString();
+            Log_OC.d(TAG, "OAUTH2: raw response from POST TOKEN: " + responseData);
+
+            if (responseData != null && responseData.length() > 0) {
+                final JSONObject tokenJson = new JSONObject(responseData);
+
+                final Map<String, String> accessTokenResult =
+                        mResponseParser.parseAccessTokenResult(tokenJson);
+
+                final RemoteOperationResult<Map<String, String>> result = new RemoteOperationResult<>(ResultCode.OK);
+                result.setData(accessTokenResult);
+                return (accessTokenResult.get(OAuth2Constants.KEY_ERROR) != null ||
+                        accessTokenResult.get(OAuth2Constants.KEY_ACCESS_TOKEN) == null)
+                        ? new RemoteOperationResult<>(ResultCode.OAUTH2_ERROR)
+                        : result;
+            } else {
+                return new RemoteOperationResult<>(postMethod);
+            }
+
+        } catch (Exception e) {
+            return new RemoteOperationResult<>(e);
+        }
+    }
+
+    private OwnCloudCredentials switchClientCredentials(OwnCloudCredentials newCredentials) {
+        OwnCloudCredentials previousCredentials = getClient().getCredentials();
+        getClient().setCredentials(newCredentials);
+        return previousCredentials;
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/authentication/oauth/OAuth2RequestBuilder.java

@@ -0,0 +1,48 @@
+/* ownCloud Android Library is available under MIT license
+ *
+ *   @author David A. Velasco
+ *   Copyright (C) 2017 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.authentication.oauth;
+
+import com.owncloud.android.lib.common.operations.RemoteOperation;
+
+public interface OAuth2RequestBuilder {
+
+    enum OAuthRequest {
+        GET_AUTHORIZATION_CODE, CREATE_ACCESS_TOKEN, REFRESH_ACCESS_TOKEN
+    }
+
+    void setRequest(OAuthRequest operation);
+
+    void setGrantType(OAuth2GrantType grantType);
+
+    void setAuthorizationCode(String code);
+
+    void setRefreshToken(String refreshToken);
+
+    RemoteOperation buildOperation();
+
+    String buildUri();
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/authentication/oauth/OAuth2ResponseParser.java

@@ -0,0 +1,77 @@
+/**
+ *   ownCloud Android client application
+ *
+ *   @author David A. Velasco
+ *
+ *   Copyright (C) 2017 ownCloud GmbH.
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License version 2,
+ *   as published by the Free Software Foundation.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+package com.owncloud.android.lib.common.authentication.oauth;
+
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.util.HashMap;
+import java.util.Map;
+
+class OAuth2ResponseParser {
+
+    Map<String, String> parseAccessTokenResult(JSONObject tokenJson) throws JSONException {
+        Map<String, String> resultTokenMap = new HashMap<>();
+
+        if (tokenJson.has(OAuth2Constants.KEY_ACCESS_TOKEN)) {
+            resultTokenMap.put(OAuth2Constants.KEY_ACCESS_TOKEN, tokenJson.
+                getString(OAuth2Constants.KEY_ACCESS_TOKEN));
+        }
+        if (tokenJson.has(OAuth2Constants.KEY_TOKEN_TYPE)) {
+            resultTokenMap.put(OAuth2Constants.KEY_TOKEN_TYPE, tokenJson.
+                getString(OAuth2Constants.KEY_TOKEN_TYPE));
+        }
+        if (tokenJson.has(OAuth2Constants.KEY_EXPIRES_IN)) {
+            resultTokenMap.put(OAuth2Constants.KEY_EXPIRES_IN, tokenJson.
+                getString(OAuth2Constants.KEY_EXPIRES_IN));
+        }
+        if (tokenJson.has(OAuth2Constants.KEY_REFRESH_TOKEN)) {
+            resultTokenMap.put(OAuth2Constants.KEY_REFRESH_TOKEN, tokenJson.
+                getString(OAuth2Constants.KEY_REFRESH_TOKEN));
+        }
+        if (tokenJson.has(OAuth2Constants.KEY_SCOPE)) {
+            resultTokenMap.put(OAuth2Constants.KEY_SCOPE, tokenJson.
+                getString(OAuth2Constants.KEY_SCOPE));
+        }
+        if (tokenJson.has(OAuth2Constants.KEY_ERROR)) {
+            resultTokenMap.put(OAuth2Constants.KEY_ERROR, tokenJson.
+                getString(OAuth2Constants.KEY_ERROR));
+        }
+        if (tokenJson.has(OAuth2Constants.KEY_ERROR_DESCRIPTION)) {
+            resultTokenMap.put(OAuth2Constants.KEY_ERROR_DESCRIPTION, tokenJson.
+                getString(OAuth2Constants.KEY_ERROR_DESCRIPTION));
+        }
+        if (tokenJson.has(OAuth2Constants.KEY_ERROR_URI)) {
+            resultTokenMap.put(OAuth2Constants.KEY_ERROR_URI, tokenJson.
+                getString(OAuth2Constants.KEY_ERROR_URI));
+        }
+
+        if (tokenJson.has(OAuth2Constants.KEY_USER_ID)) {   // not standard
+            resultTokenMap.put(OAuth2Constants.KEY_USER_ID, tokenJson.
+                getString(OAuth2Constants.KEY_USER_ID));
+        }
+
+        return resultTokenMap;
+    }
+
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/authentication/oauth/OwnCloudOAuth2Provider.java

@@ -0,0 +1,94 @@
+/* ownCloud Android Library is available under MIT license
+ *
+ *   @author David A. Velasco
+ *   Copyright (C) 2017 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.authentication.oauth;
+
+import com.owncloud.android.lib.common.utils.Log_OC;
+
+public class OwnCloudOAuth2Provider implements OAuth2Provider {
+
+    public static final String NAME = OAuth2Provider.class.getName();
+
+    public static final String ACCESS_TOKEN_ENDPOINT_PATH = "index.php/apps/oauth2/api/v1/token";
+    private static final String AUTHORIZATION_CODE_ENDPOINT_PATH = "index.php/apps/oauth2/authorize";
+
+    private String mAuthorizationServerUrl = "";
+    private String mAccessTokenEndpointPath = ACCESS_TOKEN_ENDPOINT_PATH;
+    private String mAuthorizationCodeEndpointPath = AUTHORIZATION_CODE_ENDPOINT_PATH;
+
+    private OAuth2ClientConfiguration mClientConfiguration;
+
+    @Override
+    public OAuth2RequestBuilder getOperationBuilder() {
+        return new OwnCloudOAuth2RequestBuilder(this);
+    }
+
+    @Override
+    public void setClientConfiguration(OAuth2ClientConfiguration oAuth2ClientConfiguration) {
+        mClientConfiguration = oAuth2ClientConfiguration;
+    }
+
+    @Override
+    public OAuth2ClientConfiguration getClientConfiguration() {
+        return mClientConfiguration;
+    }
+
+    @Override
+    public void setAuthorizationServerUri(String authorizationServerUri) {
+        mAuthorizationServerUrl = authorizationServerUri;
+    }
+
+    @Override
+    public String getAuthorizationServerUri() {
+        return mAuthorizationServerUrl;
+    }
+
+    public String getAccessTokenEndpointPath() {
+        return mAccessTokenEndpointPath;
+    }
+
+    public void setAccessTokenEndpointPath(String accessTokenEndpointPath) {
+        if (accessTokenEndpointPath == null || accessTokenEndpointPath.length() <= 0) {
+            Log_OC.w(NAME, "Setting invalid access token endpoint path, going on with default");
+            mAccessTokenEndpointPath = ACCESS_TOKEN_ENDPOINT_PATH;
+        } else {
+            mAccessTokenEndpointPath = accessTokenEndpointPath;
+        }
+    }
+
+    public String getAuthorizationCodeEndpointPath() {
+        return mAuthorizationCodeEndpointPath;
+    }
+
+    public void setAuthorizationCodeEndpointPath(String authorizationCodeEndpointPath) {
+        if (authorizationCodeEndpointPath == null || authorizationCodeEndpointPath.length() <= 0) {
+            Log_OC.w(NAME, "Setting invalid authorization code endpoint path, going on with default");
+            mAuthorizationCodeEndpointPath = AUTHORIZATION_CODE_ENDPOINT_PATH;
+        } else {
+            mAuthorizationCodeEndpointPath = authorizationCodeEndpointPath;
+        }
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/authentication/oauth/OwnCloudOAuth2RequestBuilder.java

@@ -0,0 +1,156 @@
+/* ownCloud Android Library is available under MIT license
+ *
+ *   @author David A. Velasco
+ *   Copyright (C) 2017 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.authentication.oauth;
+
+import android.net.Uri;
+
+import com.owncloud.android.lib.common.operations.RemoteOperation;
+
+public class OwnCloudOAuth2RequestBuilder implements OAuth2RequestBuilder {
+
+    private OwnCloudOAuth2Provider mOAuth2Provider;
+
+    private OAuthRequest mRequest;
+    private OAuth2GrantType mGrantType = OAuth2GrantType.AUTHORIZATION_CODE;
+    private String mCode;
+    private String mRefreshToken;
+
+    public OwnCloudOAuth2RequestBuilder(OwnCloudOAuth2Provider ownCloudOAuth2Provider) {
+        mOAuth2Provider = ownCloudOAuth2Provider;
+    }
+
+    @Override
+    public void setRequest(OAuthRequest request) {
+        mRequest = request;
+    }
+
+    @Override
+    public void setGrantType(OAuth2GrantType grantType) {
+        mGrantType = grantType;
+    }
+
+    @Override
+    public void setAuthorizationCode(String code) {
+        mCode = code;
+    }
+
+    @Override
+    public void setRefreshToken(String refreshToken) {
+        mRefreshToken = refreshToken;
+    }
+
+    @Override
+    public RemoteOperation buildOperation() {
+        if (mGrantType != OAuth2GrantType.AUTHORIZATION_CODE &&
+                mGrantType != OAuth2GrantType.REFRESH_TOKEN) {
+            throw new UnsupportedOperationException(
+                "Unsupported grant type. Only " +
+                    OAuth2GrantType.AUTHORIZATION_CODE.getValue() + " and " +
+                        OAuth2GrantType.REFRESH_TOKEN + " are supported"
+            );
+        }
+        OAuth2ClientConfiguration clientConfiguration = mOAuth2Provider.getClientConfiguration();
+
+        switch(mRequest) {
+            case CREATE_ACCESS_TOKEN:
+                return new OAuth2GetAccessTokenOperation(
+                    mGrantType.getValue(),
+                    mCode,
+                    clientConfiguration.getClientId(),
+                    clientConfiguration.getClientSecret(),
+                    clientConfiguration.getRedirectUri(),
+                    mOAuth2Provider.getAccessTokenEndpointPath()
+                );
+
+            case REFRESH_ACCESS_TOKEN:
+                return new OAuth2RefreshAccessTokenOperation(
+                        clientConfiguration.getClientId(),
+                        clientConfiguration.getClientSecret(),
+                        mRefreshToken,
+                        mOAuth2Provider.getAccessTokenEndpointPath()
+                );
+            default:
+                throw new UnsupportedOperationException(
+                    "Unsupported request"
+                );
+        }
+    }
+
+    @Override
+    public String buildUri() {
+        if (OAuth2GrantType.AUTHORIZATION_CODE != mGrantType) {
+            throw new UnsupportedOperationException(
+                "Unsupported grant type. Only " +
+                    OAuth2GrantType.AUTHORIZATION_CODE.getValue() + " is supported by this provider"
+            );
+        }
+        OAuth2ClientConfiguration clientConfiguration = mOAuth2Provider.getClientConfiguration();
+        Uri uri;
+        Uri.Builder uriBuilder;
+        switch(mRequest) {
+            case GET_AUTHORIZATION_CODE:
+                uri = Uri.parse(mOAuth2Provider.getAuthorizationServerUri());
+                uriBuilder = uri.buildUpon();
+                uriBuilder.appendEncodedPath(mOAuth2Provider.getAuthorizationCodeEndpointPath());
+                uriBuilder.appendQueryParameter(
+                    OAuth2Constants.KEY_RESPONSE_TYPE, OAuth2Constants.OAUTH2_RESPONSE_TYPE_CODE
+                );
+                uriBuilder.appendQueryParameter(
+                    OAuth2Constants.KEY_REDIRECT_URI, clientConfiguration.getRedirectUri()
+                );
+                uriBuilder.appendQueryParameter(
+                    OAuth2Constants.KEY_CLIENT_ID, clientConfiguration.getClientId()
+                );
+
+                uri = uriBuilder.build();
+                return uri.toString();
+
+            case CREATE_ACCESS_TOKEN:
+                uri = Uri.parse(mOAuth2Provider.getAuthorizationServerUri());
+                uriBuilder = uri.buildUpon();
+                uriBuilder.appendEncodedPath(mOAuth2Provider.getAccessTokenEndpointPath());
+                uriBuilder.appendQueryParameter(
+                    OAuth2Constants.KEY_RESPONSE_TYPE, OAuth2Constants.OAUTH2_RESPONSE_TYPE_CODE
+                );
+                uriBuilder.appendQueryParameter(
+                    OAuth2Constants.KEY_REDIRECT_URI, clientConfiguration.getRedirectUri()
+                );
+                uriBuilder.appendQueryParameter(
+                    OAuth2Constants.KEY_CLIENT_ID, clientConfiguration.getClientId()
+                );
+
+                uri = uriBuilder.build();
+                return uri.toString();
+
+            default:
+                throw new UnsupportedOperationException(
+                    "Unsupported request"
+                );
+        }
+    }
+
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/http/HttpClient.java

@@ -0,0 +1,172 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.http;
+
+import android.content.Context;
+
+import com.owncloud.android.lib.common.OwnCloudClientManagerFactory;
+import com.owncloud.android.lib.common.http.interceptors.HttpInterceptor;
+import com.owncloud.android.lib.common.http.interceptors.RequestHeaderInterceptor;
+import com.owncloud.android.lib.common.network.AdvancedX509TrustManager;
+import com.owncloud.android.lib.common.network.NetworkUtils;
+import com.owncloud.android.lib.common.utils.Log_OC;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.TimeUnit;
+
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.X509TrustManager;
+
+import okhttp3.Cookie;
+import okhttp3.CookieJar;
+import okhttp3.HttpUrl;
+import okhttp3.OkHttpClient;
+import okhttp3.Protocol;
+
+/**
+ * Client used to perform network operations
+ * @author David González Verdugo
+ */
+public class HttpClient {
+    private static final String TAG = HttpClient.class.toString();
+
+    private static OkHttpClient sOkHttpClient;
+    private static HttpInterceptor sOkHttpInterceptor;
+    private static Context sContext;
+    private static HashMap<String, List<Cookie>> sCookieStore = new HashMap<>();
+
+    public static void setContext(Context context) {
+        sContext = context;
+    }
+
+    public Context getContext() {
+        return sContext;
+    }
+
+    public static OkHttpClient getOkHttpClient() {
+        if (sOkHttpClient == null) {
+            try {
+                final X509TrustManager trustManager = new AdvancedX509TrustManager(
+                        NetworkUtils.getKnownServersStore(sContext));
+                final SSLContext sslContext = SSLContext.getInstance("TLS");
+                sslContext.init(null, new TrustManager[] {trustManager}, null);
+
+                // Automatic cookie handling, NOT PERSISTENT
+                CookieJar cookieJar = new CookieJar() {
+                    @Override
+                    public void saveFromResponse(HttpUrl url, List<Cookie> cookies) {
+                        // Avoid duplicated cookies
+                        Set<Cookie> nonDuplicatedCookiesSet = new HashSet<>();
+                        nonDuplicatedCookiesSet.addAll(cookies);
+                        List<Cookie> nonDuplicatedCookiesList = new ArrayList<>();
+                        nonDuplicatedCookiesList.addAll(nonDuplicatedCookiesSet);
+
+                        sCookieStore.put(url.host(), nonDuplicatedCookiesList);
+                    }
+
+                    @Override
+                    public List<Cookie> loadForRequest(HttpUrl url) {
+                        List<Cookie> cookies = sCookieStore.get(url.host());
+                        return cookies != null ? cookies : new ArrayList<>();
+                    }
+                };
+
+                OkHttpClient.Builder clientBuilder = new OkHttpClient.Builder()
+                        .addInterceptor(getOkHttpInterceptor())
+                        .protocols(Arrays.asList(Protocol.HTTP_1_1))
+                        .readTimeout(HttpConstants.DEFAULT_DATA_TIMEOUT, TimeUnit.MILLISECONDS)
+                        .writeTimeout(HttpConstants.DEFAULT_DATA_TIMEOUT, TimeUnit.MILLISECONDS)
+                        .connectTimeout(HttpConstants.DEFAULT_CONNECTION_TIMEOUT, TimeUnit.MILLISECONDS)
+                        .followRedirects(false)
+                        .sslSocketFactory(sslContext.getSocketFactory(), trustManager)
+                        .hostnameVerifier((asdf, usdf) -> true)
+                        .cookieJar(cookieJar);
+                        // TODO: Not verifying the hostname against certificate. ask owncloud security human if this is ok.
+                        //.hostnameVerifier(new BrowserCompatHostnameVerifier());
+                sOkHttpClient = clientBuilder.build();
+
+            } catch (Exception e) {
+                Log_OC.e(TAG, "Could not setup SSL system.", e);
+            }
+        }
+        return sOkHttpClient;
+    }
+
+    private static HttpInterceptor getOkHttpInterceptor() {
+        if (sOkHttpInterceptor == null) {
+            sOkHttpInterceptor = new HttpInterceptor();
+            addHeaderForAllRequests(HttpConstants.USER_AGENT_HEADER, OwnCloudClientManagerFactory.getUserAgent());
+            addHeaderForAllRequests(HttpConstants.PARAM_SINGLE_COOKIE_HEADER, "true");
+            addHeaderForAllRequests(HttpConstants.ACCEPT_ENCODING_HEADER, HttpConstants.ACCEPT_ENCODING_IDENTITY);
+        }
+        return sOkHttpInterceptor;
+    }
+
+    public void disableAutomaticCookiesHandling() {
+        OkHttpClient.Builder clientBuilder = getOkHttpClient().newBuilder();
+        clientBuilder.cookieJar(new CookieJar() {
+            @Override
+            public void saveFromResponse(HttpUrl url, List<Cookie> cookies) {
+                // DO NOTHING
+            }
+
+            @Override
+            public List<Cookie> loadForRequest(HttpUrl url) {
+                return new ArrayList<>();
+            }
+        });
+        sOkHttpClient = clientBuilder.build();
+    }
+
+    /**
+     * Add header that will be included for all the requests from now on
+     * @param headerName
+     * @param headerValue
+     */
+    public static void addHeaderForAllRequests(String headerName, String headerValue) {
+        getOkHttpInterceptor()
+                .addRequestInterceptor(
+                        new RequestHeaderInterceptor(headerName, headerValue)
+                );
+    }
+
+    public static void deleteHeaderForAllRequests(String headerName) {
+        getOkHttpInterceptor().deleteRequestHeaderInterceptor(headerName);
+    }
+
+    public List<Cookie> getCookiesFromUrl(HttpUrl httpUrl) {
+        return sCookieStore.get(httpUrl.host());
+    }
+
+    public void clearCookies() {
+        sCookieStore.clear();
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/http/HttpConstants.java

@@ -0,0 +1,189 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.http;
+
+/**
+ * @author David González Verdugo
+ */
+public class HttpConstants {
+
+    /***********************************************************************************************************
+     *************************************************** HEADERS ***********************************************
+     ***********************************************************************************************************/
+
+    public static final String AUTHORIZATION_HEADER = "Authorization";
+    public static final String COOKIE_HEADER = "Cookie";
+    public static final String BEARER_AUTHORIZATION_KEY = "Bearer ";
+    public static final String USER_AGENT_HEADER = "User-Agent";
+    public static final String IF_MATCH_HEADER = "If-Match";
+    public static final String IF_NONE_MATCH_HEADER = "If-None-Match";
+    public static final String CONTENT_TYPE_HEADER = "Content-Type";
+    public static final String CONTENT_LENGTH_HEADER = "Content-Length";
+    public static final String OC_TOTAL_LENGTH_HEADER = "OC-Total-Length";
+    public static final String OC_X_OC_MTIME_HEADER = "X-OC-Mtime";
+    public static final String PARAM_SINGLE_COOKIE_HEADER = "http.protocol.single-cookie-header";
+    public static final String OC_X_REQUEST_ID = "X-Request-ID";
+    public static final String LOCATION_HEADER = "Location";
+    public static final String LOCATION_HEADER_LOWER = "location";
+    public static final String CONTENT_TYPE_URLENCODED_UTF8 = "application/x-www-form-urlencoded; charset=utf-8";
+    public static final String ACCEPT_ENCODING_HEADER = "Accept-Encoding";
+    public static final String ACCEPT_ENCODING_IDENTITY = "identity";
+
+    /***********************************************************************************************************
+     ************************************************ STATUS CODES *********************************************
+     ***********************************************************************************************************/
+
+    /**
+     * 1xx Informational
+     */
+
+    // 100 Continue (HTTP/1.1 - RFC 2616)
+    public static final int HTTP_CONTINUE = 100;
+    // 101 Switching Protocols (HTTP/1.1 - RFC 2616)
+    public static final int HTTP_SWITCHING_PROTOCOLS = 101;
+    // 102 Processing (WebDAV - RFC 2518)
+    public static final int HTTP_PROCESSING = 102;
+
+    /**
+     * 2xx Success
+     */
+
+    // 200 OK (HTTP/1.0 - RFC 1945)
+    public static final int HTTP_OK = 200;
+    // 201 Created (HTTP/1.0 - RFC 1945)
+    public static final int HTTP_CREATED = 201;
+    // 202 Accepted (HTTP/1.0 - RFC 1945)
+    public static final int HTTP_ACCEPTED = 202;
+    // 203 Non Authoritative Information (HTTP/1.1 - RFC 2616)
+    public static final int HTTP_NON_AUTHORITATIVE_INFORMATION = 203;
+    // 204 No Content</tt> (HTTP/1.0 - RFC 1945)
+    public static final int HTTP_NO_CONTENT = 204;
+    // 205 Reset Content</tt> (HTTP/1.1 - RFC 2616)
+    public static final int HTTP_RESET_CONTENT = 205;
+    // 206 Partial Content</tt> (HTTP/1.1 - RFC 2616)
+    public static final int HTTP_PARTIAL_CONTENT = 206;
+    //207 Multi-Status (WebDAV - RFC 2518) or 207 Partial Update OK (HTTP/1.1 - draft-ietf-http-v11-spec-rev-01?)
+    public static final int HTTP_MULTI_STATUS = 207;
+
+    /**
+     * 3xx Redirection
+     */
+
+    // 300 Mutliple Choices</tt> (HTTP/1.1 - RFC 2616)
+    public static final int HTTP_MULTIPLE_CHOICES = 300;
+    // 301 Moved Permanently</tt> (HTTP/1.0 - RFC 1945)
+    public static final int HTTP_MOVED_PERMANENTLY = 301;
+    // 302 Moved Temporarily</tt> (Sometimes <tt>Found) (HTTP/1.0 - RFC 1945)
+    public static final int HTTP_MOVED_TEMPORARILY = 302;
+    // 303 See Other (HTTP/1.1 - RFC 2616)
+    public static final int HTTP_SEE_OTHER = 303;
+    // 304 Not Modified (HTTP/1.0 - RFC 1945)
+    public static final int HTTP_NOT_MODIFIED = 304;
+    // 305 Use Proxy (HTTP/1.1 - RFC 2616)
+    public static final int HTTP_USE_PROXY = 305;
+    // 307 Temporary Redirect (HTTP/1.1 - RFC 2616)
+    public static final int HTTP_TEMPORARY_REDIRECT = 307;
+
+    /**
+     * 4xx Client Error
+     */
+
+    // 400 Bad Request (HTTP/1.1 - RFC 2616)
+    public static final int HTTP_BAD_REQUEST = 400;
+    // 401 Unauthorized (HTTP/1.0 - RFC 1945)
+    public static final int HTTP_UNAUTHORIZED = 401;
+    // 402 Payment Required (HTTP/1.1 - RFC 2616)
+    public static final int HTTP_PAYMENT_REQUIRED = 402;
+    // 403 Forbidden (HTTP/1.0 - RFC 1945)
+    public static final int HTTP_FORBIDDEN = 403;
+    // 404 Not Found (HTTP/1.0 - RFC 1945)
+    public static final int HTTP_NOT_FOUND = 404;
+    // 405 Method Not Allowed (HTTP/1.1 - RFC 2616)
+    public static final int HTTP_METHOD_NOT_ALLOWED = 405;
+    // 406 Not Acceptable (HTTP/1.1 - RFC 2616)
+    public static final int HTTP_NOT_ACCEPTABLE = 406;
+    // 407 Proxy Authentication Required (HTTP/1.1 - RFC 2616)
+    public static final int HTTP_PROXY_AUTHENTICATION_REQUIRED = 407;
+    // 408 Request Timeout (HTTP/1.1 - RFC 2616)
+    public static final int HTTP_REQUEST_TIMEOUT = 408;
+    // 409 Conflict (HTTP/1.1 - RFC 2616)
+    public static final int HTTP_CONFLICT = 409;
+    // 410 Gone (HTTP/1.1 - RFC 2616)
+    public static final int HTTP_GONE = 410;
+    // 411 Length Required (HTTP/1.1 - RFC 2616)
+    public static final int HTTP_LENGTH_REQUIRED = 411;
+    // 412 Precondition Failed (HTTP/1.1 - RFC 2616)
+    public static final int HTTP_PRECONDITION_FAILED = 412;
+    // 413 Request Entity Too Large (HTTP/1.1 - RFC 2616)
+    public static final int HTTP_REQUEST_TOO_LONG = 413;
+    // 414 Request-URI Too Long (HTTP/1.1 - RFC 2616)
+    public static final int HTTP_REQUEST_URI_TOO_LONG = 414;
+    // 415 Unsupported Media Type (HTTP/1.1 - RFC 2616)
+    public static final int HTTP_UNSUPPORTED_MEDIA_TYPE = 415;
+    // 416 Requested Range Not Satisfiable (HTTP/1.1 - RFC 2616)
+    public static final int HTTP_REQUESTED_RANGE_NOT_SATISFIABLE = 416;
+    // 417 Expectation Failed (HTTP/1.1 - RFC 2616)
+    public static final int HTTP_EXPECTATION_FAILED = 417;
+    // 419 Insufficient Space on Resource (WebDAV - draft-ietf-webdav-protocol-05?)
+    // or <tt>419 Proxy Reauthentication Required (HTTP/1.1 drafts?)
+    public static final int HTTP_INSUFFICIENT_SPACE_ON_RESOURCE = 419;
+    // 420 Method Failure (WebDAV - draft-ietf-webdav-protocol-05?)
+    public static final int HTTP_METHOD_FAILURE = 420;
+    // 422 Unprocessable Entity (WebDAV - RFC 2518)
+    public static final int HTTP_UNPROCESSABLE_ENTITY = 422;
+    // 423 Locked (WebDAV - RFC 2518)
+    public static final int HTTP_LOCKED = 423;
+    // 424 Failed Dependency (WebDAV - RFC 2518)
+    public static final int HTTP_FAILED_DEPENDENCY = 424;
+
+    /**
+     * 5xx Client Error
+     */
+
+    // 500 Server Error (HTTP/1.0 - RFC 1945)
+    public static final int HTTP_INTERNAL_SERVER_ERROR = 500;
+    // 501 Not Implemented (HTTP/1.0 - RFC 1945)
+    public static final int HTTP_NOT_IMPLEMENTED = 501;
+    // 502 Bad Gateway (HTTP/1.0 - RFC 1945)
+    public static final int HTTP_BAD_GATEWAY = 502;
+    // 503 Service Unavailable (HTTP/1.0 - RFC 1945)
+    public static final int HTTP_SERVICE_UNAVAILABLE = 503;
+    // 504 Gateway Timeout (HTTP/1.1 - RFC 2616)
+    public static final int HTTP_GATEWAY_TIMEOUT = 504;
+    // 505 HTTP Version Not Supported (HTTP/1.1 - RFC 2616)
+    public static final int HTTP_HTTP_VERSION_NOT_SUPPORTED = 505;
+    // 507 Insufficient Storage (WebDAV - RFC 2518)
+    public static final int HTTP_INSUFFICIENT_STORAGE = 507;
+
+    /***********************************************************************************************************
+     *************************************************** TIMEOUTS **********************************************
+     ***********************************************************************************************************/
+
+    /** Default timeout for waiting data from the server */
+    public static final int DEFAULT_DATA_TIMEOUT = 60000;
+
+    /** Default timeout for establishing a connection */
+    public static final int DEFAULT_CONNECTION_TIMEOUT = 60000;
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/http/interceptors/HttpInterceptor.java

@@ -0,0 +1,109 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.http.interceptors;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Iterator;
+
+import okhttp3.Interceptor;
+import okhttp3.Request;
+import okhttp3.Response;
+
+/**
+ * Http interceptor to use multiple interceptors in the same {@link okhttp3.OkHttpClient} instance
+ * @author David González Verdugo
+ */
+public class HttpInterceptor implements Interceptor {
+
+    private final ArrayList<RequestInterceptor> mRequestInterceptors = new ArrayList<>();
+    private final ArrayList<ResponseInterceptor> mResponseInterceptors = new ArrayList<>();
+
+    @Override
+    public Response intercept(Chain chain) throws IOException {
+        Request request = chain.request();
+
+        for (RequestInterceptor interceptor : mRequestInterceptors) {
+            request = interceptor.intercept(request);
+        }
+
+        Response response = chain.proceed(request);
+
+        for (ResponseInterceptor interceptor : mResponseInterceptors) {
+            response = interceptor.intercept(response);
+        }
+
+        return response;
+    }
+
+    public interface RequestInterceptor {
+        Request intercept(Request request) throws IOException;
+    }
+
+    public interface ResponseInterceptor {
+        Response intercept(Response response) throws IOException;
+    }
+
+    public HttpInterceptor addRequestInterceptor(RequestInterceptor requestInterceptor) {
+        mRequestInterceptors.add(requestInterceptor);
+        return this;
+    }
+
+    public HttpInterceptor addResponseInterceptor (ResponseInterceptor responseInterceptor) {
+        mResponseInterceptors.add(responseInterceptor);
+        return this;
+    }
+
+    public ArrayList<RequestInterceptor> getRequestInterceptors() {
+        return mRequestInterceptors;
+    }
+
+    private ArrayList<RequestHeaderInterceptor> getRequestHeaderInterceptors() {
+        ArrayList<RequestHeaderInterceptor> requestHeaderInterceptors = new ArrayList<>();
+
+        for (RequestInterceptor requestInterceptor : mRequestInterceptors) {
+            if (requestInterceptor instanceof RequestHeaderInterceptor) {
+                requestHeaderInterceptors.add((RequestHeaderInterceptor) requestInterceptor);
+            }
+        }
+
+        return requestHeaderInterceptors;
+    }
+
+    public void deleteRequestHeaderInterceptor(String headerName) {
+        Iterator<RequestInterceptor> requestInterceptorIterator = mRequestInterceptors.iterator();
+        while (requestInterceptorIterator.hasNext()) {
+            RequestInterceptor currentRequestInterceptor = requestInterceptorIterator.next();
+            if (currentRequestInterceptor instanceof RequestHeaderInterceptor &&
+                    ((RequestHeaderInterceptor) currentRequestInterceptor).getHeaderName().equals(headerName)) {
+                requestInterceptorIterator.remove();
+            }
+        }
+    }
+
+    public ArrayList<ResponseInterceptor> getResponseInterceptors() {
+        return mResponseInterceptors;
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/http/interceptors/RequestHeaderInterceptor.java

@@ -0,0 +1,54 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.http.interceptors;
+
+import okhttp3.Request;
+
+/**
+ * Intercept requests to update their headers
+ */
+public class RequestHeaderInterceptor implements HttpInterceptor.RequestInterceptor {
+
+    private String mHeaderName;
+    private String mHeaderValue;
+
+    public RequestHeaderInterceptor(String headerName, String headerValue) {
+        this.mHeaderName = headerName;
+        this.mHeaderValue = headerValue;
+    }
+
+    @Override
+    public Request intercept(Request request) {
+        return request.newBuilder().addHeader(mHeaderName, mHeaderValue).build();
+    }
+
+    public String getHeaderName() {
+        return mHeaderName;
+    }
+
+    public String getHeaderValue() {
+        return mHeaderValue;
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/http/methods/HttpBaseMethod.java

@@ -0,0 +1,192 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.http.methods;
+
+import com.owncloud.android.lib.common.http.HttpClient;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.util.concurrent.TimeUnit;
+
+import okhttp3.Call;
+import okhttp3.Headers;
+import okhttp3.HttpUrl;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.RequestBody;
+import okhttp3.Response;
+
+/**
+ * Wrapper to perform http calls transparently by using:
+ * - OkHttp for non webdav methods
+ * - Dav4Android for webdav methods
+ *
+ * @author David González Verdugo
+ */
+public abstract class HttpBaseMethod {
+    protected OkHttpClient mOkHttpClient;
+    protected Request mRequest;
+    protected RequestBody mRequestBody;
+    protected Response mResponse;
+    protected String mResponseBodyString;
+    protected Call mCall;
+
+    protected HttpBaseMethod(URL url) {
+        mOkHttpClient = HttpClient.getOkHttpClient();
+        mRequest = new Request.Builder()
+                .url(HttpUrl.parse(url.toString()))
+                .build();
+    }
+
+    public int execute() throws Exception {
+        return onExecute();
+    }
+
+    public void abort() {
+        mCall.cancel();
+    }
+
+    public boolean isAborted() {
+        return mCall.isCanceled();
+    }
+
+    //////////////////////////////
+    //         For override
+    //////////////////////////////
+
+    protected abstract int onExecute() throws Exception;
+
+    //////////////////////////////
+    //         Getter
+    //////////////////////////////
+
+    // Request
+
+    public Headers getRequestHeaders() {
+        return mRequest.headers();
+    }
+
+    public String getRequestHeader(String name) {
+        return mRequest.header(name);
+    }
+
+    // Response
+
+    public int getStatusCode() {
+        return mResponse.code();
+    }
+
+    public String getStatusMessage() {
+        return mResponse.message();
+    }
+
+    public String getResponseBodyAsString() throws IOException {
+        if (mResponseBodyString == null && mResponse.body() != null) {
+            mResponseBodyString = mResponse.body().string();
+        }
+
+        return mResponseBodyString;
+    }
+
+    public InputStream getResponseBodyAsStream() {
+        if (mResponse.body() != null) {
+            return mResponse.body().byteStream();
+        }
+        return null;
+    }
+
+    public Headers getResponseHeaders() {
+        return mResponse.headers();
+    }
+
+    public String getResponseHeader(String headerName) {
+        return mResponse.header(headerName);
+    }
+
+    public boolean getRetryOnConnectionFailure() {
+        return mOkHttpClient.retryOnConnectionFailure();
+    }
+
+    //////////////////////////////
+    //         Setter
+    //////////////////////////////
+
+    // Connection parameters
+
+    public void setReadTimeout(long readTimeout, TimeUnit timeUnit) {
+        mOkHttpClient = mOkHttpClient.newBuilder()
+                .readTimeout(readTimeout, timeUnit)
+                .build();
+    }
+
+    public void setConnectionTimeout(long connectionTimeout, TimeUnit timeUnit) {
+        mOkHttpClient = mOkHttpClient.newBuilder()
+                .readTimeout(connectionTimeout, timeUnit)
+                .build();
+    }
+
+    public void setFollowRedirects(boolean followRedirects) {
+        mOkHttpClient = mOkHttpClient.newBuilder()
+                .followRedirects(followRedirects)
+                .build();
+    }
+
+    public void setRetryOnConnectionFailure(boolean retryOnConnectionFailure) {
+        mOkHttpClient = mOkHttpClient.newBuilder()
+                .retryOnConnectionFailure(retryOnConnectionFailure)
+                .build();
+    }
+
+    // Request
+
+    public void addRequestHeader(String name, String value) {
+        mRequest = mRequest.newBuilder()
+                .addHeader(name, value)
+                .build();
+    }
+
+    /**
+     * Sets a header and replace it if already exists with that name
+     *
+     * @param name  header name
+     * @param value header value
+     */
+    public void setRequestHeader(String name, String value) {
+        mRequest = mRequest.newBuilder()
+                .header(name, value)
+                .build();
+    }
+
+    public void setRequestBody(RequestBody requestBody) {
+        mRequestBody = requestBody;
+    }
+
+    public void setUrl(HttpUrl url) {
+        mRequest = mRequest.newBuilder()
+                .url(url)
+                .build();
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/http/methods/nonwebdav/DeleteMethod.java

@@ -0,0 +1,50 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.http.methods.nonwebdav;
+
+import java.io.IOException;
+import java.net.URL;
+
+import okhttp3.HttpUrl;
+
+/**
+ * OkHttp delete calls wrapper
+ * @author David González Verdugo
+ */
+public class DeleteMethod extends HttpMethod{
+
+    public DeleteMethod(URL url) {
+        super(url);
+    }
+
+    @Override
+    public int onExecute() throws IOException {
+        mRequest = mRequest.newBuilder()
+                .delete()
+                .build();
+
+        return super.onExecute();
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/http/methods/nonwebdav/GetMethod.java

@@ -0,0 +1,50 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.http.methods.nonwebdav;
+
+import java.io.IOException;
+import java.net.URL;
+
+import okhttp3.HttpUrl;
+
+/**
+ * OkHttp get calls wrapper
+ * @author David González Verdugo
+ */
+public class GetMethod extends HttpMethod {
+
+    public GetMethod(URL url) {
+        super(url);
+    }
+
+    @Override
+    public int onExecute() throws IOException {
+        mRequest = mRequest.newBuilder()
+                .get()
+                .build();
+
+        return super.onExecute();
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/http/methods/nonwebdav/HttpMethod.java

@@ -0,0 +1,52 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.http.methods.nonwebdav;
+
+import com.owncloud.android.lib.common.http.methods.HttpBaseMethod;
+
+import java.io.IOException;
+import java.net.URL;
+
+import okhttp3.Call;
+import okhttp3.HttpUrl;
+
+/**
+ * Wrapper to perform OkHttp calls
+ *
+ * @author David González Verdugo
+ */
+public abstract class HttpMethod extends HttpBaseMethod {
+
+    public HttpMethod(URL url) {
+        super(url);
+    }
+
+    @Override
+    public int onExecute() throws IOException {
+        mCall = mOkHttpClient.newCall(mRequest);
+        mResponse = mCall.execute();
+        return super.getStatusCode();
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/http/methods/nonwebdav/PostMethod.java

@@ -0,0 +1,50 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.http.methods.nonwebdav;
+
+import java.io.IOException;
+import java.net.URL;
+
+import okhttp3.HttpUrl;
+
+/**
+ * OkHttp post calls wrapper
+ * @author David González Verdugo
+ */
+public class PostMethod extends HttpMethod {
+
+    public PostMethod(URL url){
+        super(url);
+    }
+
+    @Override
+    public int onExecute() throws IOException {
+        mRequest = mRequest.newBuilder()
+                .post(mRequestBody)
+                .build();
+
+        return super.onExecute();
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/http/methods/nonwebdav/PutMethod.java

@@ -0,0 +1,46 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.http.methods.nonwebdav;
+
+import java.io.IOException;
+import java.net.URL;
+
+import okhttp3.HttpUrl;
+
+public class PutMethod extends HttpMethod{
+
+    public PutMethod(URL url){
+        super(url);
+    }
+
+    @Override
+    public int onExecute() throws IOException {
+        mRequest = mRequest.newBuilder()
+                .put(mRequestBody)
+                .build();
+
+        return super.onExecute();
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/http/methods/webdav/CopyMethod.java

@@ -0,0 +1,56 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.http.methods.webdav;
+
+import java.net.URL;
+
+import kotlin.Unit;
+
+/**
+ * Copy calls wrapper
+ * @author Christian Schabesberger
+ * @author David González Verdugo
+ */
+public class CopyMethod extends DavMethod {
+
+    final String destinationUrl;
+    final boolean forceOverride;
+
+    public CopyMethod(URL url, String destinationUrl, boolean forceOverride) {
+        super(url);
+        this.destinationUrl = destinationUrl;
+        this.forceOverride = forceOverride;
+    }
+
+    @Override
+    public int onExecute() throws Exception {
+        mDavResource.copy(destinationUrl, forceOverride, response -> {
+            mResponse = response;
+            return Unit.INSTANCE;
+        });
+
+        return super.getStatusCode();
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/http/methods/webdav/DavConstants.java

@@ -0,0 +1,33 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.http.methods.webdav;
+
+/**
+ * @author David González Verdugo
+ */
+public class DavConstants {
+    public static final int DEPTH_0 = 0;
+    public static final int DEPTH_1 = 1;
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/http/methods/webdav/DavMethod.java

@@ -0,0 +1,158 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.http.methods.webdav;
+
+import com.owncloud.android.lib.common.http.HttpConstants;
+import com.owncloud.android.lib.common.http.methods.HttpBaseMethod;
+
+import java.net.URL;
+import java.util.concurrent.TimeUnit;
+
+import at.bitfire.dav4android.Constants;
+import at.bitfire.dav4android.DavOCResource;
+import at.bitfire.dav4android.exception.HttpException;
+import at.bitfire.dav4android.exception.RedirectException;
+import okhttp3.HttpUrl;
+import okhttp3.Protocol;
+import okhttp3.Response;
+import okhttp3.ResponseBody;
+
+/**
+ * Wrapper to perform WebDAV (dav4android) calls
+ * @author David González Verdugo
+ */
+public abstract class DavMethod extends HttpBaseMethod {
+
+    protected DavOCResource mDavResource;
+
+    protected DavMethod(URL url) {
+        super(url);
+        mDavResource = new DavOCResource(
+                mOkHttpClient,
+                HttpUrl.parse(url.toString()),
+                Constants.INSTANCE.getLog());
+    }
+
+    @Override
+    public void abort() {
+        mDavResource.cancelCall();
+    }
+
+    @Override
+    public int execute() throws Exception {
+        try {
+            return onExecute();
+        } catch (HttpException httpException) {
+            // Modify responses with information gathered from exceptions
+            if (httpException instanceof RedirectException) {
+                mResponse = new Response.Builder()
+                        .header(
+                                HttpConstants.LOCATION_HEADER, ((RedirectException) httpException).getRedirectLocation()
+                        )
+                        .code(httpException.getCode())
+                        .request(mRequest)
+                        .message(httpException.getMessage())
+                        .protocol(Protocol.HTTP_1_1)
+                        .build();
+
+            } else if (mResponse != null) {
+                ResponseBody responseBody = ResponseBody.create(
+                        mResponse.body().contentType(),
+                        httpException.getResponseBody()
+                );
+
+                mResponse = mResponse.newBuilder()
+                        .body(responseBody)
+                        .build();
+            }
+
+            return httpException.getCode();
+        }
+    }
+
+    //////////////////////////////
+    //         Setter
+    //////////////////////////////
+
+    // Connection parameters
+    @Override
+    public void setReadTimeout(long readTimeout, TimeUnit timeUnit) {
+        super.setReadTimeout(readTimeout, timeUnit);
+        mDavResource = new DavOCResource(
+                mOkHttpClient,
+                HttpUrl.parse(mRequest.url().toString()),
+                Constants.INSTANCE.getLog());
+    }
+
+    @Override
+    public void setConnectionTimeout(long connectionTimeout, TimeUnit timeUnit) {
+        super.setConnectionTimeout(connectionTimeout, timeUnit);
+        mDavResource = new DavOCResource(
+                mOkHttpClient,
+                HttpUrl.parse(mRequest.url().toString()),
+                Constants.INSTANCE.getLog());
+    }
+
+    @Override
+    public void setFollowRedirects(boolean followRedirects) {
+        super.setFollowRedirects(followRedirects);
+        mDavResource = new DavOCResource(
+                mOkHttpClient,
+                HttpUrl.parse(mRequest.url().toString()),
+                Constants.INSTANCE.getLog());
+    }
+
+    @Override
+    public void setRetryOnConnectionFailure(boolean retryOnConnectionFailure) {
+        super.setRetryOnConnectionFailure(retryOnConnectionFailure);
+        mDavResource = new DavOCResource(
+                mOkHttpClient,
+                HttpUrl.parse(mRequest.url().toString()),
+                Constants.INSTANCE.getLog());
+    }
+
+    @Override
+    public void setUrl(HttpUrl url){
+        super.setUrl(url);
+        mDavResource = new DavOCResource(
+                mOkHttpClient,
+                HttpUrl.parse(mRequest.url().toString()),
+                Constants.INSTANCE.getLog());
+    }
+
+    //////////////////////////////
+    //         Getter
+    //////////////////////////////
+
+    @Override
+    public boolean getRetryOnConnectionFailure() {
+        return false; //TODO: implement me
+    }
+
+    @Override
+    public boolean isAborted() {
+        return mDavResource.isCallAborted();
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/http/methods/webdav/DavUtils.java

@@ -0,0 +1,15 @@
+package com.owncloud.android.lib.common.http.methods.webdav;
+
+import at.bitfire.dav4android.Property;
+import at.bitfire.dav4android.PropertyUtils;
+
+public class DavUtils {
+
+    public static final Property.Name[] getAllPropset() {
+        return PropertyUtils.INSTANCE.getAllPropSet();
+    }
+
+    public static final Property.Name[] getQuotaPropSet() {
+        return PropertyUtils.INSTANCE.getQuotaPropset();
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/http/methods/webdav/MkColMethod.java

@@ -0,0 +1,50 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.http.methods.webdav;
+
+import java.net.URL;
+
+import kotlin.Unit;
+
+/**
+ * MkCol calls wrapper
+ * @author Christian Schabesberger
+ * @author David González Verdugo
+ */
+public class MkColMethod extends DavMethod {
+    public MkColMethod(URL url) {
+        super(url);
+    }
+
+    @Override
+    public int onExecute() throws Exception {
+        mDavResource.mkCol(null, response -> {
+            mResponse = response;
+            return Unit.INSTANCE;
+        });
+
+        return super.getStatusCode();
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/http/methods/webdav/MoveMethod.java

@@ -0,0 +1,61 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.http.methods.webdav;
+
+import com.owncloud.android.lib.common.http.HttpConstants;
+
+import java.net.URL;
+
+import kotlin.Unit;
+
+/**
+ * Move calls wrapper
+ * @author Christian Schabesberger
+ * @author David González Verdugo
+ */
+public class MoveMethod extends DavMethod {
+    final String destinationUrl;
+    final boolean forceOverride;
+
+    public MoveMethod(URL url, String destinationUrl, boolean forceOverride) {
+        super(url);
+        this.destinationUrl = destinationUrl;
+        this.forceOverride = forceOverride;
+    }
+
+    @Override
+    public int onExecute() throws Exception {
+        mDavResource.move(
+                destinationUrl,
+                forceOverride,
+                super.getRequestHeader(HttpConstants.OC_TOTAL_LENGTH_HEADER),
+                super.getRequestHeader(HttpConstants.OC_X_OC_MTIME_HEADER), response -> {
+                    mResponse = response;
+                    return Unit.INSTANCE;
+                });
+
+        return super.getStatusCode();
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/http/methods/webdav/PropfindMethod.java

@@ -0,0 +1,93 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.http.methods.webdav;
+
+import java.io.IOException;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.List;
+
+import at.bitfire.dav4android.Property;
+import at.bitfire.dav4android.Response;
+import at.bitfire.dav4android.exception.DavException;
+import kotlin.Unit;
+
+/**
+ * Propfind calls wrapper
+ * @author David González Verdugo
+ */
+public class PropfindMethod extends DavMethod {
+
+    // request
+    private final int mDepth;
+    private final Property.Name[] mPropertiesToRequest;
+
+    // response
+    private final List<Response> mMembers;
+    private Response mRoot;
+
+    public PropfindMethod(URL url, int depth, Property.Name[] propertiesToRequest) {
+        super(url);
+        mDepth = depth;
+        mPropertiesToRequest = propertiesToRequest;
+        mMembers = new ArrayList<>();
+        mRoot = null;
+    }
+
+    @Override
+    public int onExecute() throws IOException, DavException{
+        mDavResource.propfind(mDepth, mPropertiesToRequest,
+                (Response response, Response.HrefRelation hrefRelation) -> {
+                    switch (hrefRelation) {
+                        case MEMBER:
+                            mMembers.add(response);
+                            break;
+                        case SELF:
+                            mRoot = response;
+                            break;
+                        case OTHER:
+                        default:
+                    }
+                    return Unit.INSTANCE;
+                }, response -> {
+                    mResponse = response;
+                    return Unit.INSTANCE;
+                });
+
+        return getStatusCode();
+    }
+
+    public int getDepth() {
+        return mDepth;
+    }
+
+    public List<Response> getMembers() {
+        return mMembers;
+    }
+
+    public Response getRoot() {
+        return mRoot;
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/http/methods/webdav/PutMethod.java

@@ -0,0 +1,59 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.http.methods.webdav;
+
+import com.owncloud.android.lib.common.http.HttpConstants;
+
+import java.io.IOException;
+import java.net.URL;
+
+import at.bitfire.dav4android.exception.HttpException;
+import kotlin.Unit;
+
+/**
+ * Put calls wrapper
+ * @author David González Verdugo
+ */
+public class PutMethod extends DavMethod {
+
+    public PutMethod(URL url) {
+        super(url);
+    };
+
+    @Override
+    public int onExecute() throws IOException, HttpException {
+        mDavResource.put(
+                mRequestBody,
+                super.getRequestHeader(HttpConstants.IF_MATCH_HEADER),
+                super.getRequestHeader(HttpConstants.CONTENT_TYPE_HEADER),
+                super.getRequestHeader(HttpConstants.OC_TOTAL_LENGTH_HEADER),
+                super.getRequestHeader(HttpConstants.OC_X_OC_MTIME_HEADER), response -> {
+                    mResponse = response;
+                    return Unit.INSTANCE;
+                });
+
+        return super.getStatusCode();
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/network/AdvancedX509TrustManager.java

@@ -0,0 +1,155 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2016 ownCloud GmbH.
+ *   
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *   
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *   
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.network;
+
+import java.security.KeyStore;
+import java.security.KeyStoreException;
+import java.security.NoSuchAlgorithmException;
+import java.security.cert.CertPathValidatorException;
+import java.security.cert.CertStoreException;
+import java.security.cert.CertificateException;
+import java.security.cert.CertificateExpiredException;
+import java.security.cert.CertificateNotYetValidException;
+import java.security.cert.X509Certificate;
+
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.TrustManagerFactory;
+import javax.net.ssl.X509TrustManager;
+
+import com.owncloud.android.lib.common.utils.Log_OC;
+
+
+
+/**
+ * @author David A. Velasco
+ */
+public class AdvancedX509TrustManager implements X509TrustManager {
+    
+    private static final String TAG = AdvancedX509TrustManager.class.getSimpleName();
+
+    private X509TrustManager mStandardTrustManager = null;
+    private KeyStore mKnownServersKeyStore;
+
+    /**
+     * Constructor for AdvancedX509TrustManager
+     * 
+     * @param  knownServersKeyStore    Local certificates store with server certificates explicitly trusted by the user.
+     * @throws CertStoreException       When no default X509TrustManager instance was found in the system.
+     */
+    public AdvancedX509TrustManager(KeyStore knownServersKeyStore)
+            throws NoSuchAlgorithmException, KeyStoreException, CertStoreException {
+        super();
+        TrustManagerFactory factory = TrustManagerFactory
+                .getInstance(TrustManagerFactory.getDefaultAlgorithm());
+        factory.init((KeyStore)null);
+        mStandardTrustManager = findX509TrustManager(factory);
+
+        mKnownServersKeyStore = knownServersKeyStore;
+    }
+    
+    
+    /**
+     * Locates the first X509TrustManager provided by a given TrustManagerFactory
+     * @param factory               TrustManagerFactory to inspect in the search for a X509TrustManager
+     * @return                      The first X509TrustManager found in factory.
+     * @throws CertStoreException   When no X509TrustManager instance was found in factory
+     */
+    private X509TrustManager findX509TrustManager(TrustManagerFactory factory) throws CertStoreException {
+        TrustManager tms[] = factory.getTrustManagers();
+        for (int i = 0; i < tms.length; i++) {
+            if (tms[i] instanceof X509TrustManager) {
+                return (X509TrustManager) tms[i];
+            }
+        }
+        return null;
+    }
+    
+
+    /**
+     * @see javax.net.ssl.X509TrustManager#checkClientTrusted(X509Certificate[],
+     *      String authType)
+     */
+    public void checkClientTrusted(X509Certificate[] certificates, String authType) throws CertificateException {
+        mStandardTrustManager.checkClientTrusted(certificates, authType);
+    }
+
+    
+    /**
+     * @see javax.net.ssl.X509TrustManager#checkServerTrusted(X509Certificate[],
+     *      String authType)
+     */
+    public void checkServerTrusted(X509Certificate[] certificates, String authType) {
+        if (!isKnownServer(certificates[0])) {
+        	CertificateCombinedException result = new CertificateCombinedException(certificates[0]);
+        	try {
+        		certificates[0].checkValidity();
+        	} catch (CertificateExpiredException c) {
+        		result.setCertificateExpiredException(c);
+        		
+        	} catch (CertificateNotYetValidException c) {
+                result.setCertificateNotYetException(c);
+        	}
+        	
+        	try {
+        	    mStandardTrustManager.checkServerTrusted(certificates, authType);
+        	} catch (CertificateException c) {
+                Throwable cause = c.getCause();
+                Throwable previousCause = null;
+                while (cause != null && cause != previousCause && !(cause instanceof CertPathValidatorException)) {     // getCause() is not funny
+                    previousCause = cause;
+                    cause = cause.getCause();
+                }
+                if (cause != null && cause instanceof CertPathValidatorException) {
+                	result.setCertPathValidatorException((CertPathValidatorException)cause);
+                } else {
+                	result.setOtherCertificateException(c);
+                }
+        	}
+        	
+        	if (result.isException())
+        		throw result;
+
+        }
+    }
+    
+    
+    /**
+     * @see javax.net.ssl.X509TrustManager#getAcceptedIssuers()
+     */
+    public X509Certificate[] getAcceptedIssuers() {
+        return mStandardTrustManager.getAcceptedIssuers();
+    }
+
+    
+    public boolean isKnownServer(X509Certificate cert) {
+        try {
+            return (mKnownServersKeyStore.getCertificateAlias(cert) != null);
+        } catch (KeyStoreException e) {
+            Log_OC.d(TAG, "Fail while checking certificate in the known-servers store");
+            return false;
+        }
+    }
+    
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/network/CertificateCombinedException.java

@@ -0,0 +1,137 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2016 ownCloud GmbH.
+ *   
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *   
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *   
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.network;
+
+import java.security.cert.CertPathValidatorException;
+import java.security.cert.CertificateException;
+import java.security.cert.CertificateExpiredException;
+import java.security.cert.CertificateNotYetValidException;
+import java.security.cert.X509Certificate;
+
+import javax.net.ssl.SSLPeerUnverifiedException;
+
+/**
+ * Exception joining all the problems that {@link AdvancedX509TrustManager} can find in
+ * a certificate chain for a server.
+ * 
+ * This was initially created as an extension of CertificateException, but some
+ * implementations of the SSL socket layer in existing devices are REPLACING the CertificateException
+ * instances thrown by {@link javax.net.ssl.X509TrustManager#checkServerTrusted(X509Certificate[], String)}
+ * with SSLPeerUnverifiedException FORGETTING THE CAUSING EXCEPTION instead of wrapping it. 
+ * 
+ * Due to this, extending RuntimeException is necessary to get that the CertificateCombinedException 
+ * instance reaches {@link AdvancedSslSocketFactory#verifyPeerIdentity}.
+ * 
+ * BE CAREFUL. As a RuntimeException extensions, Java compilers do not require to handle it
+ * in client methods. Be sure to use it only when you know exactly where it will go.
+ * 
+ * @author David A. Velasco
+ */
+public class CertificateCombinedException extends RuntimeException {
+
+    /** Generated - to refresh every time the class changes */
+    private static final long serialVersionUID = -8875782030758554999L;
+    
+    private X509Certificate mServerCert = null;
+    private String mHostInUrl;
+
+    private CertificateExpiredException mCertificateExpiredException = null;
+    private CertificateNotYetValidException mCertificateNotYetValidException = null;
+    private CertPathValidatorException mCertPathValidatorException = null;
+    private CertificateException mOtherCertificateException = null;
+    private SSLPeerUnverifiedException mSslPeerUnverifiedException = null;
+    
+    public CertificateCombinedException(X509Certificate x509Certificate) {
+        mServerCert = x509Certificate;
+    }
+
+    public X509Certificate getServerCertificate() {
+        return mServerCert;
+    }
+
+    public String getHostInUrl() {
+        return mHostInUrl;
+    }
+
+    public void setHostInUrl(String host) {
+        mHostInUrl = host;
+    }
+
+    public CertificateExpiredException getCertificateExpiredException() {
+        return mCertificateExpiredException;
+    }
+
+    public void setCertificateExpiredException(CertificateExpiredException c) {
+        mCertificateExpiredException  = c;
+    }
+
+    public CertificateNotYetValidException getCertificateNotYetValidException() {
+        return mCertificateNotYetValidException;
+    }
+
+    public void setCertificateNotYetException(CertificateNotYetValidException c) {
+        mCertificateNotYetValidException = c;
+    }
+
+    public CertPathValidatorException getCertPathValidatorException() {
+        return mCertPathValidatorException;
+    }
+
+    public void setCertPathValidatorException(CertPathValidatorException c) {
+        mCertPathValidatorException = c;
+    }
+
+    public CertificateException getOtherCertificateException() {
+        return mOtherCertificateException;
+    }
+
+    public void setOtherCertificateException(CertificateException c) {
+        mOtherCertificateException = c;
+    }
+
+    public SSLPeerUnverifiedException getSslPeerUnverifiedException() {
+        return mSslPeerUnverifiedException ; 
+    }
+
+    public void setSslPeerUnverifiedException(SSLPeerUnverifiedException s) {
+        mSslPeerUnverifiedException = s;
+    }
+
+    public boolean isException() {
+        return (mCertificateExpiredException != null ||
+                mCertificateNotYetValidException != null ||
+                mCertPathValidatorException != null ||
+                mOtherCertificateException != null ||
+                mSslPeerUnverifiedException != null);
+    }
+
+    public boolean isRecoverable() {
+        return (mCertificateExpiredException != null ||
+                mCertificateNotYetValidException != null ||
+                mCertPathValidatorException != null ||
+                mSslPeerUnverifiedException != null);
+    }
+
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/network/ChunkFromFileRequestBody.java

@@ -0,0 +1,135 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.network;
+
+import android.util.Log;
+
+import com.owncloud.android.lib.common.utils.Log_OC;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.channels.FileChannel;
+import java.util.Iterator;
+
+import okhttp3.MediaType;
+import okio.BufferedSink;
+
+/**
+ * A Request body that represents a file chunk and include information about the progress when uploading it
+ *
+ * @author David González Verdugo
+ */
+public class ChunkFromFileRequestBody extends FileRequestBody {
+
+    private static final String TAG = ChunkFromFileRequestBody.class.getSimpleName();
+
+    //private final File mFile;
+    private final FileChannel mChannel;
+    private final long mChunkSize;
+    private long mOffset;
+    private long mTransferred;
+    private ByteBuffer mBuffer = ByteBuffer.allocate(4096);
+
+    public ChunkFromFileRequestBody(File file, MediaType contentType, FileChannel channel, long chunkSize) {
+        super(file, contentType);
+        if (channel == null) {
+            throw new IllegalArgumentException("File may not be null");
+        }
+        if (chunkSize <= 0) {
+            throw new IllegalArgumentException("Chunk size must be greater than zero");
+        }
+        this.mChannel = channel;
+        this.mChunkSize = chunkSize;
+        mOffset = 0;
+        mTransferred = 0;
+    }
+
+    @Override
+    public long contentLength() {
+        try {
+            return Math.min(mChunkSize, mChannel.size() - mChannel.position());
+        } catch (IOException e) {
+            return mChunkSize;
+        }
+    }
+
+    @Override
+    public void writeTo(BufferedSink sink) {
+        int readCount;
+        Iterator<OnDatatransferProgressListener> it;
+
+        try {
+            mChannel.position(mOffset);
+            long size = mFile.length();
+            if (size == 0) size = -1;
+            long maxCount = Math.min(mOffset + mChunkSize, mChannel.size());
+            while (mChannel.position() < maxCount) {
+
+
+                Log_OC.d(TAG, "Sink buffer size: " + sink.buffer().size());
+
+                readCount = mChannel.read(mBuffer);
+
+                Log_OC.d(TAG, "Read " + readCount + " bytes from file channel to " + mBuffer.toString());
+
+                sink.buffer().write(mBuffer.array(), 0 ,readCount);
+
+                sink.flush();
+
+                Log_OC.d(TAG, "Write " + readCount + " bytes to sink buffer with size " + sink.buffer().size());
+
+                mBuffer.clear();
+                if (mTransferred < maxCount) {  // condition to avoid accumulate progress for repeated chunks
+                    mTransferred += readCount;
+                }
+                synchronized (mDataTransferListeners) {
+                    it = mDataTransferListeners.iterator();
+                    while (it.hasNext()) {
+                        it.next().onTransferProgress(readCount, mTransferred, size, mFile.getAbsolutePath());
+                    }
+                }
+            }
+
+            Log.d(TAG, "Chunk with size " + mChunkSize + " written in request body");
+
+        } catch (Exception exception) {
+
+            Log.e(TAG, exception.toString());
+//            // any read problem will be handled as if the file is not there
+//            if (io instanceof FileNotFoundException) {
+//                throw io;
+//            } else {
+//                FileNotFoundException fnf = new FileNotFoundException("Exception reading source file");
+//                fnf.initCause(io);
+//                throw fnf;
+//            }
+        }
+    }
+
+    public void setOffset(long offset) {
+        this.mOffset = offset;
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/network/FileRequestBody.java

@@ -0,0 +1,120 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.network;
+
+import android.util.Log;
+
+import com.owncloud.android.lib.common.utils.Log_OC;
+
+import java.io.File;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Set;
+
+import okhttp3.MediaType;
+import okhttp3.RequestBody;
+import okio.BufferedSink;
+import okio.Okio;
+import okio.Source;
+
+/**
+ * A Request body that represents a file and include information about the progress when uploading it
+ *
+ * @author David González Verdugo
+ */
+public class FileRequestBody extends RequestBody implements ProgressiveDataTransferer {
+
+    private static final String TAG = FileRequestBody.class.getSimpleName();
+
+    protected File mFile;
+    private MediaType mContentType;
+    Set<OnDatatransferProgressListener> mDataTransferListeners = new HashSet<>();
+
+    public FileRequestBody(File file, MediaType contentType) {
+        mFile = file;
+        mContentType = contentType;
+    }
+
+    @Override
+    public MediaType contentType() {
+        return mContentType;
+    }
+
+    @Override
+    public long contentLength() {
+        return mFile.length();
+    }
+
+    @Override
+    public void writeTo(BufferedSink sink) {
+        Source source;
+        Iterator<OnDatatransferProgressListener> it;
+        try {
+            source = Okio.source(mFile);
+
+            long transferred = 0;
+            long read;
+
+            while ((read = source.read(sink.buffer(), 4096)) != -1) {
+                transferred += read;
+                sink.flush();
+                synchronized (mDataTransferListeners) {
+                    it = mDataTransferListeners.iterator();
+                    while (it.hasNext()) {
+                        it.next().onTransferProgress(read, transferred, mFile.length(), mFile.getAbsolutePath());
+                    }
+                }
+            }
+
+            Log.d(TAG, "File with name " + mFile.getName() + " and size " + mFile.length() +
+                    " written in request body");
+
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    @Override
+    public void addDatatransferProgressListener(OnDatatransferProgressListener listener) {
+        synchronized (mDataTransferListeners) {
+            mDataTransferListeners.add(listener);
+        }
+    }
+
+    @Override
+    public void addDatatransferProgressListeners(Collection<OnDatatransferProgressListener> listeners) {
+        synchronized (mDataTransferListeners) {
+            mDataTransferListeners.addAll(listeners);
+        }
+    }
+
+    @Override
+    public void removeDatatransferProgressListener(OnDatatransferProgressListener listener) {
+        synchronized (mDataTransferListeners) {
+            mDataTransferListeners.remove(listener);
+        }
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/network/NetworkUtils.java

@@ -0,0 +1,130 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2016 ownCloud GmbH.
+ *   
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *   
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *   
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.network;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.security.KeyStore;
+import java.security.KeyStoreException;
+import java.security.NoSuchAlgorithmException;
+import java.security.cert.Certificate;
+import java.security.cert.CertificateException;
+
+
+import org.apache.http.conn.ssl.X509HostnameVerifier;
+
+import android.content.Context;
+
+import com.owncloud.android.lib.common.utils.Log_OC;
+
+public class NetworkUtils {
+    
+    final private static String TAG = NetworkUtils.class.getSimpleName();
+    
+    /** Default timeout for waiting data from the server */
+    public static final int DEFAULT_DATA_TIMEOUT = 60000;
+    
+    /** Default timeout for establishing a connection */
+    public static final int DEFAULT_CONNECTION_TIMEOUT = 60000;
+    
+    /** Standard name for protocol TLS version 1.2 in Java Secure Socket Extension (JSSE) API */
+    public static final String PROTOCOL_TLSv1_2 = "TLSv1.2";
+    
+    /** Standard name for protocol TLS version 1.0 in JSSE API */
+    public static final String PROTOCOL_TLSv1_0 = "TLSv1";
+
+    private static X509HostnameVerifier mHostnameVerifier = null;
+
+    private static String LOCAL_TRUSTSTORE_FILENAME = "knownServers.bks";
+    
+    private static String LOCAL_TRUSTSTORE_PASSWORD = "password";
+
+    private static KeyStore mKnownServersStore = null;
+    
+    /**
+     * Returns the local store of reliable server certificates, explicitly accepted by the user.
+     * 
+     * Returns a KeyStore instance with empty content if the local store was never created.
+     * 
+     * Loads the store from the storage environment if needed.
+     * 
+     * @param context                       Android context where the operation is being performed.
+     * @return                              KeyStore instance with explicitly-accepted server certificates. 
+     * @throws KeyStoreException            When the KeyStore instance could not be created.
+     * @throws IOException                  When an existing local trust store could not be loaded.
+     * @throws NoSuchAlgorithmException     When the existing local trust store was saved with an unsupported algorithm.
+     * @throws CertificateException         When an exception occurred while loading the certificates from the local 
+     * 										trust store.
+     */
+    public static KeyStore getKnownServersStore(Context context)
+    		throws KeyStoreException, IOException, NoSuchAlgorithmException, CertificateException {
+        if (mKnownServersStore == null) {
+            //mKnownServersStore = KeyStore.getInstance("BKS");
+            mKnownServersStore = KeyStore.getInstance(KeyStore.getDefaultType());
+            File localTrustStoreFile = new File(context.getFilesDir(), LOCAL_TRUSTSTORE_FILENAME);
+            Log_OC.d(TAG, "Searching known-servers store at " + localTrustStoreFile.getAbsolutePath());
+            if (localTrustStoreFile.exists()) {
+                InputStream in = new FileInputStream(localTrustStoreFile);
+                try {
+                    mKnownServersStore.load(in, LOCAL_TRUSTSTORE_PASSWORD.toCharArray());
+                } finally {
+                    in.close();
+                }
+            } else {
+            	// next is necessary to initialize an empty KeyStore instance
+            	mKnownServersStore.load(null, LOCAL_TRUSTSTORE_PASSWORD.toCharArray()); 
+            }
+        }
+        return mKnownServersStore;
+    }
+    
+    
+    public static void addCertToKnownServersStore(Certificate cert, Context context) 
+    		throws  KeyStoreException, NoSuchAlgorithmException, CertificateException, IOException {
+    	
+        KeyStore knownServers = getKnownServersStore(context);
+        knownServers.setCertificateEntry(Integer.toString(cert.hashCode()), cert);
+        FileOutputStream fos = null;
+        try {
+            fos = context.openFileOutput(LOCAL_TRUSTSTORE_FILENAME, Context.MODE_PRIVATE);
+            knownServers.store(fos, LOCAL_TRUSTSTORE_PASSWORD.toCharArray());
+        } finally {
+            fos.close();
+        }
+    }
+
+    public static boolean isCertInKnownServersStore(Certificate cert, Context context) 
+    		throws KeyStoreException, NoSuchAlgorithmException, CertificateException, IOException {
+    	
+    	KeyStore knownServers = getKnownServersStore(context);
+    	Log_OC.d(TAG, "Certificate - HashCode: " + cert.hashCode() + " "
+    			+ Boolean.toString(knownServers.isCertificateEntry(Integer.toString(cert.hashCode()))));
+    	return knownServers.isCertificateEntry(Integer.toString(cert.hashCode()));
+    }
+
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/network/OnDatatransferProgressListener.java

@@ -0,0 +1,30 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2016 ownCloud GmbH.
+ *   Copyright (C) 2012  Bartek Przybylski
+ *   
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *   
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *   
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.network;
+
+public interface OnDatatransferProgressListener {
+    void onTransferProgress(long read, long transferred, long percent, String absolutePath);
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/network/ProgressiveDataTransferer.java

@@ -0,0 +1,38 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2016 ownCloud GmbH.
+ *   
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *   
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *   
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.network;
+
+import java.util.Collection;
+
+
+public interface ProgressiveDataTransferer {
+
+    public void addDatatransferProgressListener (OnDatatransferProgressListener listener);
+    
+    public void addDatatransferProgressListeners(Collection<OnDatatransferProgressListener> listeners);
+
+    public void removeDatatransferProgressListener(OnDatatransferProgressListener listener);
+
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/network/RedirectionPath.java

@@ -0,0 +1,128 @@
+/* ownCloud Android Library is available under MIT license
+ *
+ *   @author David A. Velasco
+ *
+ *   Copyright (C) 2016 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.network;
+
+
+
+import com.owncloud.android.lib.common.http.HttpConstants;
+
+import java.util.Arrays;
+
+
+/**
+ * Aggregate saving the list of URLs followed in a sequence of redirections during the exceution of a
+ * {@link RemoteOperation}, and the status codes corresponding to all
+ * of them.
+ *
+ * The last status code saved corresponds to the first response not being a redirection, unless the sequence exceeds
+ * the maximum length of redirections allowed by the {@link com.owncloud.android.lib.common.OwnCloudClient} instance
+ * that ran the operation.
+ *
+ * If no redirection was followed, the last (and first) status code contained corresponds to the original URL in the
+ * request.
+ */
+public class RedirectionPath {
+
+    private int[] mStatuses = null;
+
+    private int mLastStatus = -1;
+
+    private String[] mLocations = null;
+
+    private int mLastLocation = -1;
+
+    /**
+     * Public constructor.
+     *
+     * @param status            Status code resulting of executing a request on the original URL.
+     * @param maxRedirections   Maximum number of redirections that will be contained.
+     * @throws IllegalArgumentException     If 'maxRedirections' is < 0
+     */
+    public RedirectionPath(int status, int maxRedirections) {
+        if (maxRedirections < 0) {
+            throw new IllegalArgumentException("maxRedirections MUST BE zero or greater");
+        }
+        mStatuses = new int[maxRedirections + 1];
+        Arrays.fill(mStatuses, -1);
+        mStatuses[++mLastStatus] = status;
+    }
+
+    /**
+     * Adds a new location URL to the list of followed redirections.
+     *
+     * @param location      URL extracted from a 'Location' header in a redirection.
+     */
+    public void addLocation(String location) {
+        if (mLocations == null) {
+            mLocations = new String[mStatuses.length - 1];
+        }
+        if (mLastLocation < mLocations.length - 1) {
+            mLocations[++mLastLocation] = location;
+        }
+    }
+
+
+    /**
+     * Adds a new status code to the list of status corresponding to followed redirections.
+     *
+     * @param status     Status code from the response of another followed redirection.
+     */
+    public void addStatus(int status) {
+        if (mLastStatus < mStatuses.length - 1) {
+            mStatuses[++mLastStatus] = status;
+        }
+    }
+
+    /**
+     * @return      Last status code saved.
+     */
+    public int getLastStatus() {
+        return mStatuses[mLastStatus];
+    }
+
+    /**
+     * @return      Last location followed corresponding to a permanent redirection (status code 301).
+     */
+    public String getLastPermanentLocation() {
+        for (int i = mLastStatus; i >= 0; i--) {
+            if (mStatuses[i] == HttpConstants.HTTP_MOVED_PERMANENTLY && i <= mLastLocation) {
+                return mLocations[i];
+            }
+        }
+        return null;
+    }
+
+    /**
+     * @return      Count of locations.
+     */
+    public int getRedirectionsCount() {
+        return mLastLocation + 1;
+    }
+
+
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/network/ServerNameIndicator.java

@@ -0,0 +1,151 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2016 ownCloud GmbH.
+ *   
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *   
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *   
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.network;
+
+import java.lang.ref.WeakReference;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.concurrent.atomic.AtomicReference;
+
+import javax.net.ssl.SSLSocket;
+
+import com.owncloud.android.lib.common.utils.Log_OC;
+
+
+/**
+ * Enables the support of Server Name Indication if existing 
+ * in the underlying network implementation.
+ * 
+ * Build as a singleton.
+ * 
+ * @author David A. Velasco
+ */
+public class ServerNameIndicator {
+	
+	private static final String TAG = ServerNameIndicator.class.getSimpleName();
+	
+	private static final AtomicReference<ServerNameIndicator> mSingleInstance = new AtomicReference<ServerNameIndicator>();
+	
+	private static final String METHOD_NAME = "setHostname";
+	
+	private final WeakReference<Class<?>> mSSLSocketClassRef;
+	private final WeakReference<Method> mSetHostnameMethodRef;
+	
+	
+	/**
+	 * Private constructor, class is a singleton.
+	 * 
+	 * @param sslSocketClass		Underlying implementation class of {@link SSLSocket} used to connect with the server. 
+	 * @param setHostnameMethod		Name of the method to call to enable the SNI support.
+	 */
+	private ServerNameIndicator(Class<?> sslSocketClass, Method setHostnameMethod) {
+		mSSLSocketClassRef = new WeakReference<Class<?>>(sslSocketClass);
+		mSetHostnameMethodRef = (setHostnameMethod == null) ? null : new WeakReference<Method>(setHostnameMethod);
+	}
+	
+	
+	/**
+	 * Calls the {@code #setHostname(String)} method of the underlying implementation 
+	 * of {@link SSLSocket} if exists.
+	 * 
+	 * Creates and initializes the single instance of the class when needed
+	 *
+	 * @param hostname 		The name of the server host of interest.
+	 * @param sslSocket 	Client socket to connect with the server.
+	 */
+	public static void setServerNameIndication(String hostname, SSLSocket sslSocket) {
+		final Method setHostnameMethod = getMethod(sslSocket);
+		if (setHostnameMethod != null) {
+			try {
+				setHostnameMethod.invoke(sslSocket, hostname);
+				Log_OC.i(TAG, "SNI done, hostname: " + hostname);
+				
+			} catch (IllegalArgumentException e) {
+				Log_OC.e(TAG, "Call to SSLSocket#setHost(String) failed ", e);
+				
+			} catch (IllegalAccessException e) {
+				Log_OC.e(TAG, "Call to SSLSocket#setHost(String) failed ", e);
+				
+			} catch (InvocationTargetException e) {
+				Log_OC.e(TAG, "Call to SSLSocket#setHost(String) failed ", e);
+			}
+		} else {
+			Log_OC.i(TAG, "SNI not supported");
+		}
+	}
+
+	
+	/**
+	 * Gets the method to invoke trying to minimize the effective 
+	 * application of reflection.
+	 * 
+	 * @param 	sslSocket		Instance of the SSL socket to use in connection with server.
+	 * @return					Method to call to indicate the server name of interest to the server.
+	 */
+	private static Method getMethod(SSLSocket sslSocket) {
+		final Class<?> sslSocketClass = sslSocket.getClass();
+		final ServerNameIndicator instance = mSingleInstance.get();
+		if (instance == null) {
+			return initFrom(sslSocketClass);
+			
+		} else if (instance.mSSLSocketClassRef.get() != sslSocketClass) {
+			// the underlying class changed
+			return initFrom(sslSocketClass);
+				
+		} else if (instance.mSetHostnameMethodRef == null) {
+			// SNI not supported
+			return null;
+				
+		} else {
+			final Method cachedSetHostnameMethod = instance.mSetHostnameMethodRef.get();
+			return (cachedSetHostnameMethod == null) ? initFrom(sslSocketClass) : cachedSetHostnameMethod;
+		}
+	}
+
+
+	/**
+	 * Singleton initializer.
+	 * 
+	 * Uses reflection to extract and 'cache' the method to invoke to indicate the desited host name to the server side.
+	 *  
+	 * @param 	sslSocketClass		Underlying class providing the implementation of {@link SSLSocket}.
+	 * @return						Method to call to indicate the server name of interest to the server.
+	 */
+	private static Method initFrom(Class<?> sslSocketClass) {
+        Log_OC.i(TAG, "SSLSocket implementation: " + sslSocketClass.getCanonicalName());
+		Method setHostnameMethod = null;
+		try {
+			setHostnameMethod = sslSocketClass.getMethod(METHOD_NAME, String.class);
+		} catch (SecurityException e) {
+			Log_OC.e(TAG, "Could not access to SSLSocket#setHostname(String) method ", e);
+			
+		} catch (NoSuchMethodException e) {
+			Log_OC.i(TAG, "Could not find SSLSocket#setHostname(String) method - SNI not supported");
+		}
+		mSingleInstance.set(new ServerNameIndicator(sslSocketClass, setHostnameMethod));
+		return setHostnameMethod;
+	}
+
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/network/WebdavUtils.java

@@ -0,0 +1,124 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2016 ownCloud GmbH.
+ *   Copyright (C) 2012 Bartek Przybylski
+ *   
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *   
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *   
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.network;
+
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.Locale;
+
+import android.net.Uri;
+
+import com.owncloud.android.lib.common.http.methods.HttpBaseMethod;
+
+public class WebdavUtils {
+    public static final SimpleDateFormat DISPLAY_DATE_FORMAT = new SimpleDateFormat(
+            "dd.MM.yyyy hh:mm");
+    
+    private static final SimpleDateFormat DATETIME_FORMATS[] = {
+    	new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US),
+    	new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz", Locale.US),	
+		new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.sss'Z'", Locale.US),
+		new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ", Locale.US),
+		new SimpleDateFormat("EEE MMM dd HH:mm:ss zzz yyyy", Locale.US),
+		new SimpleDateFormat("EEEEEE, dd-MMM-yy HH:mm:ss zzz", Locale.US),
+		new SimpleDateFormat("EEE MMMM d HH:mm:ss yyyy", Locale.US),
+		new SimpleDateFormat("yyyy-MM-dd hh:mm:ss", Locale.US)
+	};
+
+    public static Date parseResponseDate(String date) {
+        Date returnDate = null;
+        SimpleDateFormat format = null;
+        for (int i = 0; i < DATETIME_FORMATS.length; ++i) {
+            try {
+            	format = DATETIME_FORMATS[i];
+            	synchronized(format) {
+            		returnDate = format.parse(date);
+            	}
+                return returnDate;
+            } catch (ParseException e) {
+            	// this is not the format
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Encodes a path according to URI RFC 2396. 
+     * 
+     * If the received path doesn't start with "/", the method adds it.
+     * 
+     * @param remoteFilePath    Path
+     * @return                  Encoded path according to RFC 2396, always starting with "/"
+     */
+    public static String encodePath(String remoteFilePath) {
+        String encodedPath = Uri.encode(remoteFilePath, "/");
+        if (!encodedPath.startsWith("/"))
+            encodedPath = "/" + encodedPath;
+        return encodedPath;
+    }
+
+    /**
+     *
+     * @param rawEtag
+     * @return
+     */
+    public static String parseEtag(String rawEtag) {
+        if (rawEtag == null || rawEtag.length() == 0) {
+            return "";
+        }
+        if (rawEtag.endsWith("-gzip")) {
+            rawEtag = rawEtag.substring(0, rawEtag.length() - 5);
+        }
+        if (rawEtag.length() >= 2 && rawEtag.startsWith("\"") && rawEtag.endsWith("\"")) {
+            rawEtag = rawEtag.substring(1, rawEtag.length() - 1);
+        }
+        return rawEtag;
+    }
+
+    /**
+     *
+     * @param httpBaseMethod from which to get the etag
+     * @return etag from response
+     */
+    public static String getEtagFromResponse(HttpBaseMethod httpBaseMethod) {
+        String eTag = httpBaseMethod.getResponseHeader("OC-ETag");
+        if (eTag == null) {
+            eTag = httpBaseMethod.getResponseHeader("oc-etag");
+        }
+        if (eTag == null) {
+            eTag = httpBaseMethod.getResponseHeader("ETag");
+        }
+        if (eTag == null) {
+            eTag = httpBaseMethod.getResponseHeader("etag");
+        }
+        String result = "";
+        if (eTag != null) {
+            result = eTag;
+        }
+        return result;
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/network/WriteTimeoutEnforcer.java

@@ -0,0 +1,173 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2017 ownCloud GmbH.
+ *   
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *   
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *   
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.network;
+
+import com.owncloud.android.lib.common.utils.Log_OC;
+
+import java.lang.ref.WeakReference;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.net.Socket;
+import java.util.concurrent.atomic.AtomicReference;
+
+
+/**
+ * Enforces, if possible, a write timeout for a socket.
+ *
+ * Built as a singleton.
+ *
+ * Tries to hit something like this:
+ * https://android.googlesource.com/platform/external/conscrypt/+/lollipop-release/src/main/java/org/conscrypt/OpenSSLSocketImpl.java#1005
+ *
+ * Minimizes the chances of getting stalled in PUT/POST request if the network interface is lost while
+ * writing the entity into the outwards sockect.
+ *
+ * It happens. See https://github.com/owncloud/android/issues/1684#issuecomment-295306015
+ *
+ * @author David A. Velasco
+ */
+public class WriteTimeoutEnforcer {
+
+    private static final String TAG = WriteTimeoutEnforcer.class.getSimpleName();
+
+    private static final AtomicReference<WriteTimeoutEnforcer> mSingleInstance = new AtomicReference<>();
+
+    private static final String METHOD_NAME = "setSoWriteTimeout";
+
+
+    private final WeakReference<Class<?>> mSocketClassRef;
+    private final WeakReference<Method> mSetSoWriteTimeoutMethodRef;
+
+
+    /**
+     * Private constructor, class is a singleton.
+     *
+     * @param socketClass               Underlying implementation class of {@link Socket} used to connect
+     *                                  with the server.
+     * @param setSoWriteTimeoutMethod   Name of the method to call to set a write timeout in the socket.
+     */
+    private WriteTimeoutEnforcer(Class<?> socketClass, Method setSoWriteTimeoutMethod) {
+        mSocketClassRef = new WeakReference<Class<?>>(socketClass);
+        mSetSoWriteTimeoutMethodRef =
+            (setSoWriteTimeoutMethod == null) ?
+                null :
+                new WeakReference<>(setSoWriteTimeoutMethod)
+        ;
+    }
+
+
+    /**
+     * Calls the {@code #setSoWrite(int)} method of the underlying implementation
+     * of {@link Socket} if exists.
+
+     * Creates and initializes the single instance of the class when needed
+     *
+     * @param writeTimeoutMilliseconds  Write timeout to set, in milliseconds.
+     * @param socket                    Client socket to connect with the server.
+     */
+    public static void setSoWriteTimeout(int writeTimeoutMilliseconds, Socket socket) {
+        final Method setSoWriteTimeoutMethod = getMethod(socket);
+        if (setSoWriteTimeoutMethod != null) {
+            try {
+                setSoWriteTimeoutMethod.invoke(socket, writeTimeoutMilliseconds);
+                Log_OC.i(
+                    TAG,
+                    "Write timeout set in socket, writeTimeoutMilliseconds: "
+                        + writeTimeoutMilliseconds
+                );
+
+            } catch (IllegalArgumentException e) {
+                Log_OC.e(TAG, "Call to (SocketImpl)#setSoWriteTimeout(int) failed ", e);
+
+            } catch (IllegalAccessException e) {
+                Log_OC.e(TAG, "Call to (SocketImpl)#setSoWriteTimeout(int) failed ", e);
+
+            } catch (InvocationTargetException e) {
+                Log_OC.e(TAG, "Call to (SocketImpl)#setSoWriteTimeout(int) failed ", e);
+            }
+        } else {
+            Log_OC.i(TAG, "Write timeout for socket not supported");
+        }
+    }
+
+
+    /**
+     * Gets the method to invoke trying to minimize the cost of reflection reusing objects cached
+     * in static members.
+     *
+     * @param socket    Instance of the socket to use in connection with server.
+     * @return          Method to call to set a write timeout in the socket.
+     */
+    private static Method getMethod(Socket socket) {
+        final Class<?> socketClass = socket.getClass();
+        final WriteTimeoutEnforcer instance = mSingleInstance.get();
+        if (instance == null) {
+            return initFrom(socketClass);
+
+        } else if (instance.mSocketClassRef.get() != socketClass) {
+            // the underlying class changed
+            return initFrom(socketClass);
+
+        } else if (instance.mSetSoWriteTimeoutMethodRef == null) {
+            // method not supported
+            return null;
+
+        } else {
+            final Method cachedSetSoWriteTimeoutMethod = instance.mSetSoWriteTimeoutMethodRef.get();
+            return (cachedSetSoWriteTimeoutMethod == null) ?
+                initFrom(socketClass) :
+                cachedSetSoWriteTimeoutMethod
+            ;
+        }
+    }
+
+
+    /**
+     * Singleton initializer.
+     *
+     * Uses reflection to extract and 'cache' the method to invoke to set a write timouet in a socket.
+     *
+     * @param socketClass   Underlying class providing the implementation of {@link Socket}.
+     * @return              Method to call to set a write timeout in the socket.
+     */
+    private static Method initFrom(Class<?> socketClass) {
+        Log_OC.i(TAG, "Socket implementation: " + socketClass.getCanonicalName());
+        Method setSoWriteTimeoutMethod = null;
+        try {
+            setSoWriteTimeoutMethod = socketClass.getMethod(METHOD_NAME, int.class);
+        } catch (SecurityException e) {
+            Log_OC.e(TAG, "Could not access to (SocketImpl)#setSoWriteTimeout(int) method ", e);
+
+        } catch (NoSuchMethodException e) {
+            Log_OC.i(
+                TAG,
+                "Could not find (SocketImpl)#setSoWriteTimeout(int) method - write timeout not supported"
+            );
+        }
+        mSingleInstance.set(new WriteTimeoutEnforcer(socketClass, setSoWriteTimeoutMethod));
+        return setSoWriteTimeoutMethod;
+    }
+
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/operations/ErrorMessageParser.java

@@ -0,0 +1,138 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2017 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+package com.owncloud.android.lib.common.operations;
+
+import android.util.Xml;
+
+import org.xmlpull.v1.XmlPullParser;
+import org.xmlpull.v1.XmlPullParserException;
+import org.xmlpull.v1.XmlPullParserFactory;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * Parser for server exceptions
+ * @author davidgonzalez
+ */
+public class ErrorMessageParser {
+	// No namespaces
+	private static final String ns = null;
+
+	// Nodes for XML Parser
+	private static final String NODE_ERROR = "d:error";
+	private static final String NODE_MESSAGE = "s:message";
+
+	/**
+	 * Parse exception response
+	 * @param is
+	 * @return errorMessage for an exception
+	 * @throws XmlPullParserException
+	 * @throws IOException
+	 */
+	public String parseXMLResponse(InputStream is) throws XmlPullParserException,
+			IOException {
+		String errorMessage = "";
+
+		try {
+			// XMLPullParser
+			XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
+			factory.setNamespaceAware(true);
+
+			XmlPullParser parser = Xml.newPullParser();
+			parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);
+			parser.setInput(is, null);
+			parser.nextTag();
+			errorMessage = readError(parser);
+
+		} finally {
+			is.close();
+		}
+		return errorMessage;
+	}
+
+	/**
+	 * Parse OCS node
+	 * @param parser
+	 * @return reason for exception
+	 * @throws XmlPullParserException
+	 * @throws IOException
+	 */
+	private String readError (XmlPullParser parser) throws XmlPullParserException, IOException {
+		String errorMessage = "";
+		parser.require(XmlPullParser.START_TAG,  ns , NODE_ERROR);
+		while (parser.next() != XmlPullParser.END_TAG) {
+			if (parser.getEventType() != XmlPullParser.START_TAG) {
+				continue;
+			}
+			String name = parser.getName();
+			// read NODE_MESSAGE
+			if (name.equalsIgnoreCase(NODE_MESSAGE)) {
+				errorMessage = readText(parser);
+			} else {
+				skip(parser);
+			}
+		}
+		return errorMessage;
+	}
+
+	/**
+	 * Skip tags in parser procedure
+	 * @param parser
+	 * @throws XmlPullParserException
+	 * @throws IOException
+	 */
+	private void skip(XmlPullParser parser) throws XmlPullParserException, IOException {
+		if (parser.getEventType() != XmlPullParser.START_TAG) {
+			throw new IllegalStateException();
+		}
+		int depth = 1;
+		while (depth != 0) {
+			switch (parser.next()) {
+				case XmlPullParser.END_TAG:
+					depth--;
+					break;
+				case XmlPullParser.START_TAG:
+					depth++;
+					break;
+			}
+		}
+	}
+
+	/**
+	 * Read the text from a node
+	 * @param parser
+	 * @return Text of the node
+	 * @throws IOException
+	 * @throws XmlPullParserException
+	 */
+	private String readText(XmlPullParser parser) throws IOException, XmlPullParserException {
+		String result = "";
+		if (parser.next() == XmlPullParser.TEXT) {
+			result = parser.getText();
+			parser.nextTag();
+		}
+		return result;
+	}
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/operations/InvalidCharacterExceptionParser.java

@@ -0,0 +1,144 @@
+
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2016 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+package com.owncloud.android.lib.common.operations;
+
+import android.util.Xml;
+
+import org.xmlpull.v1.XmlPullParser;
+import org.xmlpull.v1.XmlPullParserException;
+import org.xmlpull.v1.XmlPullParserFactory;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * Parser for Invalid Character server exception
+ * @author masensio
+ */
+public class InvalidCharacterExceptionParser {
+
+    private static final String EXCEPTION_STRING = "OC\\Connector\\Sabre\\Exception\\InvalidPath";
+	private static final String EXCEPTION_UPLOAD_STRING = "OCP\\Files\\InvalidPathException";
+
+    // No namespaces
+	private static final String ns = null;
+
+    // Nodes for XML Parser
+    private static final String NODE_ERROR = "d:error";
+	private static final String NODE_EXCEPTION = "s:exception";
+    /**
+	 * Parse is as an Invalid Path Exception
+	 * @param is
+	 * @return if The exception is an Invalid Char Exception
+	 * @throws XmlPullParserException
+	 * @throws IOException
+	 */
+	public boolean parseXMLResponse(InputStream is) throws XmlPullParserException,
+            IOException {
+        boolean result = false;
+
+		try {
+			// XMLPullParser
+			XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
+			factory.setNamespaceAware(true);
+
+			XmlPullParser parser = Xml.newPullParser();
+			parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);
+			parser.setInput(is, null);
+			parser.nextTag();
+			result = readError(parser);
+
+		} finally {
+			is.close();
+		}
+		return result;
+	}
+
+	/**
+	 * Parse OCS node
+	 * @param parser
+	 * @return List of ShareRemoteFiles
+	 * @throws XmlPullParserException
+	 * @throws IOException
+	 */
+	private boolean readError (XmlPullParser parser) throws XmlPullParserException, IOException {
+		String exception = "";
+		parser.require(XmlPullParser.START_TAG,  ns , NODE_ERROR);
+		while (parser.next() != XmlPullParser.END_TAG) {
+			if (parser.getEventType() != XmlPullParser.START_TAG) {
+				continue;
+			}
+			String name = parser.getName();
+			// read NODE_EXCEPTION
+			if (name.equalsIgnoreCase(NODE_EXCEPTION)) {
+				exception = readText(parser);
+			} else {
+				skip(parser);
+			}
+
+		}
+		return exception.equalsIgnoreCase(EXCEPTION_STRING) ||
+				exception.equalsIgnoreCase(EXCEPTION_UPLOAD_STRING);
+	}
+
+	/**
+	 * Skip tags in parser procedure
+	 * @param parser
+	 * @throws XmlPullParserException
+	 * @throws IOException
+	 */
+	private void skip(XmlPullParser parser) throws XmlPullParserException, IOException {
+		if (parser.getEventType() != XmlPullParser.START_TAG) {
+			throw new IllegalStateException();
+		}
+		int depth = 1;
+		while (depth != 0) {
+			switch (parser.next()) {
+			case XmlPullParser.END_TAG:
+				depth--;
+				break;
+			case XmlPullParser.START_TAG:
+				depth++;
+				break;
+			}
+		}
+	}
+
+    	/**
+	 * Read the text from a node
+	 * @param parser
+	 * @return Text of the node
+	 * @throws IOException
+	 * @throws XmlPullParserException
+	 */
+	private String readText(XmlPullParser parser) throws IOException, XmlPullParserException {
+		String result = "";
+		if (parser.next() == XmlPullParser.TEXT) {
+			result = parser.getText();
+			parser.nextTag();
+		}
+		return result;
+	}
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/operations/OnRemoteOperationListener.java

@@ -0,0 +1,32 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2016 ownCloud GmbH.
+ *   
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *   
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *   
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.operations;
+
+
+public interface OnRemoteOperationListener {
+
+	void onRemoteOperationFinish(RemoteOperation caller, RemoteOperationResult result);
+	
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/operations/OperationCancelledException.java

@@ -0,0 +1,34 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2016 ownCloud GmbH.
+ *   
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *   
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *   
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.operations;
+
+public class OperationCancelledException extends Exception {
+
+    /**
+     * Generated serial version - to avoid Java warning
+     */
+    private static final long serialVersionUID = -6350981497740424983L;
+
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/operations/RemoteOperation.java

@@ -0,0 +1,285 @@
+package com.owncloud.android.lib.common.operations;
+
+import android.accounts.Account;
+import android.accounts.AccountsException;
+import android.accounts.AuthenticatorException;
+import android.accounts.OperationCanceledException;
+import android.content.Context;
+import android.os.Handler;
+
+import com.owncloud.android.lib.common.OwnCloudAccount;
+import com.owncloud.android.lib.common.OwnCloudClient;
+import com.owncloud.android.lib.common.OwnCloudClientManagerFactory;
+import com.owncloud.android.lib.common.accounts.AccountUtils;
+import com.owncloud.android.lib.common.utils.Log_OC;
+
+import java.io.IOException;
+
+import okhttp3.OkHttpClient;
+
+public abstract class RemoteOperation<T extends Object> implements Runnable {
+
+    private static final String TAG = RemoteOperation.class.getSimpleName();
+
+    /**
+     * OCS API header name
+     */
+    public static final String OCS_API_HEADER = "OCS-APIREQUEST";
+
+    /**
+     * OCS API header value
+     */
+    public static final String OCS_API_HEADER_VALUE = "true";
+
+    /**
+     * ownCloud account in the remote ownCloud server to operate
+     */
+    protected Account mAccount = null;
+
+    /**
+     * Android Application context
+     */
+    protected Context mContext = null;
+
+    /**
+     * Object to interact with the remote server
+     */
+    protected OwnCloudClient mClient = null;
+
+    /**
+     * Object to interact with the remote server
+     */
+    protected OkHttpClient mHttpClient = null;
+
+    /**
+     * Callback object to notify about the execution of the remote operation
+     */
+    protected OnRemoteOperationListener mListener = null;
+
+    /**
+     * Handler to the thread where mListener methods will be called
+     */
+    protected Handler mListenerHandler = null;
+
+
+    /**
+     * Asynchronously executes the remote operation
+     *
+     * This method should be used whenever an ownCloud account is available,
+     * instead of {@link #execute(OwnCloudClient, OnRemoteOperationListener, Handler))}.
+     *
+     * @param account         ownCloud account in remote ownCloud server to reach during the
+     *                        execution of the operation.
+     * @param context         Android context for the component calling the method.
+     * @param listener        Listener to be notified about the execution of the operation.
+     * @param listenerHandler Handler associated to the thread where the methods of the listener
+     *                        objects must be called.
+     * @return Thread were the remote operation is executed.
+     */
+    public Thread execute(Account account, Context context,
+                          OnRemoteOperationListener listener, Handler listenerHandler) {
+
+        if (account == null)
+            throw new IllegalArgumentException
+                    ("Trying to execute a remote operation with a NULL Account");
+        if (context == null)
+            throw new IllegalArgumentException
+                    ("Trying to execute a remote operation with a NULL Context");
+        // mAccount and mContext in the runnerThread to create below
+        mAccount = account;
+        mContext = context.getApplicationContext();
+        mClient = null;     // the client instance will be created from
+
+        mListener = listener;
+
+        mListenerHandler = listenerHandler;
+
+        Thread runnerThread = new Thread(this);
+        runnerThread.start();
+        return runnerThread;
+    }
+
+
+    /**
+     * Asynchronously executes the remote operation
+     *
+     * @param client          Client object to reach an ownCloud server
+     *                        during the execution of the operation.
+     * @param listener        Listener to be notified about the execution of the operation.
+     * @param listenerHandler Handler, if passed in, associated to the thread where the methods of
+     *                        the listener objects must be called.
+     * @return Thread were the remote operation is executed.
+     */
+    public Thread execute(OwnCloudClient client,
+                          OnRemoteOperationListener listener, Handler listenerHandler) {
+        if (client == null) {
+            throw new IllegalArgumentException
+                    ("Trying to execute a remote operation with a NULL OwnCloudClient");
+        }
+        mClient = client;
+        if (client.getAccount() != null) {
+            mAccount = client.getAccount().getSavedAccount();
+        }
+        mContext = client.getContext();
+
+        if (listener == null) {
+            throw new IllegalArgumentException
+                    ("Trying to execute a remote operation asynchronously " +
+                            "without a listener to notiy the result");
+        }
+        mListener = listener;
+
+        if (listenerHandler != null) {
+            mListenerHandler = listenerHandler;
+        }
+
+        Thread runnerThread = new Thread(this);
+        runnerThread.start();
+        return runnerThread;
+    }
+
+    protected void grantOwnCloudClient() throws
+            AccountUtils.AccountNotFoundException, OperationCanceledException, AuthenticatorException, IOException {
+        if (mClient == null) {
+            if (mAccount != null && mContext != null) {
+                OwnCloudAccount ocAccount = new OwnCloudAccount(mAccount, mContext);
+                mClient = OwnCloudClientManagerFactory.getDefaultSingleton().
+                        getClientFor(ocAccount, mContext);
+            } else {
+                throw new IllegalStateException("Trying to run a remote operation " +
+                        "asynchronously with no client and no chance to create one (no account)");
+            }
+        }
+    }
+
+    /**
+     * Returns the current client instance to access the remote server.
+     *
+     * @return Current client instance to access the remote server.
+     */
+    public final OwnCloudClient getClient() {
+        return mClient;
+    }
+
+    /**
+     * Abstract method to implement the operation in derived classes.
+     */
+    protected abstract RemoteOperationResult<T> run(OwnCloudClient client);
+
+    /**
+     * Synchronously executes the remote operation on the received ownCloud account.
+     *
+     * Do not call this method from the main thread.
+     *
+     * This method should be used whenever an ownCloud account is available, instead of
+     * {@link #execute(OwnCloudClient)}.
+     *
+     * @param account ownCloud account in remote ownCloud server to reach during the
+     *                execution of the operation.
+     * @param context Android context for the component calling the method.
+     * @return Result of the operation.
+     */
+    public RemoteOperationResult<T> execute(Account account, Context context) {
+        if (account == null)
+            throw new IllegalArgumentException("Trying to execute a remote operation with a NULL " +
+                    "Account");
+        if (context == null)
+            throw new IllegalArgumentException("Trying to execute a remote operation with a NULL " +
+                    "Context");
+        mAccount = account;
+        mContext = context.getApplicationContext();
+
+        return runOperation();
+    }
+
+
+    /**
+     * Synchronously executes the remote operation
+     *
+     * Do not call this method from the main thread.
+     *
+     * @param client Client object to reach an ownCloud server during the execution of
+     *               the operation.
+     * @return Result of the operation.
+     */
+    public RemoteOperationResult<T> execute(OwnCloudClient client) {
+        if (client == null)
+            throw new IllegalArgumentException("Trying to execute a remote operation with a NULL " +
+                    "OwnCloudClient");
+        mClient = client;
+        if (client.getAccount() != null) {
+            mAccount = client.getAccount().getSavedAccount();
+        }
+        mContext = client.getContext();
+
+        return runOperation();
+    }
+
+    /**
+     * Synchronously executes the remote operation
+     *
+     * Do not call this method from the main thread.
+     *
+     * @param client Client object to reach an ownCloud server during the execution of
+     *               the operation.
+     * @return Result of the operation.
+     */
+    public RemoteOperationResult<T> execute(OkHttpClient client, Context context) {
+        if (client == null)
+            throw new IllegalArgumentException("Trying to execute a remote operation with a NULL " +
+                    "OwnCloudClient");
+        mHttpClient = client;
+        mContext = context;
+
+        return runOperation();
+    }
+
+    /**
+     * Run operation for asynchronous or synchronous 'onExecute' method.
+     *
+     * Considers and performs silent refresh of account credentials if possible, and if
+     * {@link RemoteOperation#setSilentRefreshOfAccountCredentials(boolean)} was called with
+     * parameter 'true' before the execution.
+     *
+     * @return      Remote operation result
+     */
+    private RemoteOperationResult<T> runOperation() {
+
+        RemoteOperationResult<T> result;
+
+        try {
+            grantOwnCloudClient();
+            result = run(mClient);
+
+        } catch (AccountsException | IOException e) {
+            Log_OC.e(TAG, "Error while trying to access to " + mAccount.name, e);
+            result = new RemoteOperationResult<>(e);
+        }
+
+        return result;
+    }
+
+    /**
+     * Asynchronous execution of the operation
+     * started by {@link RemoteOperation#execute(OwnCloudClient,
+     * OnRemoteOperationListener, Handler)},
+     * and result posting.
+     */
+    @Override
+    public final void run() {
+
+        final RemoteOperationResult resultToSend = runOperation();
+
+        if (mAccount != null && mContext != null) {
+            // Save Client Cookies
+            AccountUtils.saveClient(mClient, mAccount, mContext);
+        }
+
+        if (mListenerHandler != null && mListener != null) {
+            mListenerHandler.post(() ->
+                    mListener.onRemoteOperationFinish(RemoteOperation.this, resultToSend));
+        } else if (mListener != null) {
+            mListener.onRemoteOperationFinish(RemoteOperation.this, resultToSend);
+        }
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/operations/RemoteOperationResult.java

@@ -0,0 +1,586 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.operations;
+
+import android.accounts.Account;
+import android.accounts.AccountsException;
+
+import com.owncloud.android.lib.common.accounts.AccountUtils;
+import com.owncloud.android.lib.common.http.HttpConstants;
+import com.owncloud.android.lib.common.http.methods.HttpBaseMethod;
+import com.owncloud.android.lib.common.network.CertificateCombinedException;
+import com.owncloud.android.lib.common.utils.Log_OC;
+
+import org.json.JSONException;
+
+import java.io.ByteArrayInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.Serializable;
+import java.net.MalformedURLException;
+import java.net.SocketException;
+import java.net.SocketTimeoutException;
+import java.net.UnknownHostException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+import javax.net.ssl.SSLException;
+import javax.net.ssl.SSLPeerUnverifiedException;
+
+import at.bitfire.dav4android.exception.DavException;
+import at.bitfire.dav4android.exception.HttpException;
+import okhttp3.Headers;
+
+public class RemoteOperationResult<T extends Object>
+        implements Serializable {
+
+    /**
+     * Generated - should be refreshed every time the class changes!!
+     */
+    private static final long serialVersionUID = 4968939884332372230L;
+
+    private static final String TAG = RemoteOperationResult.class.getSimpleName();
+
+    public enum ResultCode {
+        OK,
+        OK_SSL,
+        OK_NO_SSL,
+        UNHANDLED_HTTP_CODE,
+        UNAUTHORIZED,
+        FILE_NOT_FOUND,
+        INSTANCE_NOT_CONFIGURED,
+        UNKNOWN_ERROR,
+        WRONG_CONNECTION,
+        TIMEOUT,
+        INCORRECT_ADDRESS,
+        HOST_NOT_AVAILABLE,
+        NO_NETWORK_CONNECTION,
+        SSL_ERROR,
+        SSL_RECOVERABLE_PEER_UNVERIFIED,
+        BAD_OC_VERSION,
+        CANCELLED,
+        INVALID_LOCAL_FILE_NAME,
+        INVALID_OVERWRITE,
+        CONFLICT,
+        OAUTH2_ERROR,
+        SYNC_CONFLICT,
+        LOCAL_STORAGE_FULL,
+        LOCAL_STORAGE_NOT_MOVED,
+        LOCAL_STORAGE_NOT_COPIED,
+        OAUTH2_ERROR_ACCESS_DENIED,
+        QUOTA_EXCEEDED,
+        ACCOUNT_NOT_FOUND,
+        ACCOUNT_EXCEPTION,
+        ACCOUNT_NOT_NEW,
+        ACCOUNT_NOT_THE_SAME,
+        INVALID_CHARACTER_IN_NAME,
+        SHARE_NOT_FOUND,
+        LOCAL_STORAGE_NOT_REMOVED,
+        FORBIDDEN,
+        SHARE_FORBIDDEN,
+        SPECIFIC_FORBIDDEN,
+        OK_REDIRECT_TO_NON_SECURE_CONNECTION,
+        INVALID_MOVE_INTO_DESCENDANT,
+        INVALID_COPY_INTO_DESCENDANT,
+        PARTIAL_MOVE_DONE,
+        PARTIAL_COPY_DONE,
+        SHARE_WRONG_PARAMETER,
+        WRONG_SERVER_RESPONSE,
+        INVALID_CHARACTER_DETECT_IN_SERVER,
+        DELAYED_FOR_WIFI,
+        LOCAL_FILE_NOT_FOUND,
+        SERVICE_UNAVAILABLE,
+        SPECIFIC_SERVICE_UNAVAILABLE,
+        SPECIFIC_UNSUPPORTED_MEDIA_TYPE,
+        SPECIFIC_METHOD_NOT_ALLOWED
+    }
+
+    private boolean mSuccess = false;
+    private int mHttpCode = -1;
+    private String mHttpPhrase = null;
+    private Exception mException = null;
+    private ResultCode mCode = ResultCode.UNKNOWN_ERROR;
+    private String mRedirectedLocation;
+    private ArrayList<String> mAuthenticate = new ArrayList<>();
+    private String mLastPermanentLocation = null;
+    private T mData = null;
+
+    /**
+     * Public constructor from result code.
+     *
+     * To be used when the caller takes the responsibility of interpreting the result of a {@link RemoteOperation}
+     *
+     * @param code {@link ResultCode} decided by the caller.
+     */
+    public RemoteOperationResult(ResultCode code) {
+        mCode = code;
+        mSuccess = (code == ResultCode.OK || code == ResultCode.OK_SSL ||
+                code == ResultCode.OK_NO_SSL ||
+                code == ResultCode.OK_REDIRECT_TO_NON_SECURE_CONNECTION);
+    }
+
+    /**
+     * Create a new RemoteOperationResult based on the result given by a previous one.
+     * It does not copy the data.
+     * @param prevRemoteOperation
+     */
+    public RemoteOperationResult(RemoteOperationResult prevRemoteOperation) {
+        mCode = prevRemoteOperation.mCode;
+        mHttpCode = prevRemoteOperation.mHttpCode;
+        mHttpPhrase = prevRemoteOperation.mHttpPhrase;
+        mAuthenticate = prevRemoteOperation.mAuthenticate;
+        mException = prevRemoteOperation.mException;
+        mLastPermanentLocation = prevRemoteOperation.mLastPermanentLocation;
+        mSuccess = prevRemoteOperation.mSuccess;
+        mRedirectedLocation = prevRemoteOperation.mRedirectedLocation;
+    }
+
+    /**
+     * Public constructor from exception.
+     *
+     * To be used when an exception prevented the end of the {@link RemoteOperation}.
+     *
+     * Determines a {@link ResultCode} depending on the type of the exception.
+     *
+     * @param e Exception that interrupted the {@link RemoteOperation}
+     */
+    public RemoteOperationResult(Exception e) {
+        mException = e;
+
+        if (e instanceof OperationCancelledException) {
+            mCode = ResultCode.CANCELLED;
+
+        } else if (e instanceof SocketException) {
+            mCode = ResultCode.WRONG_CONNECTION;
+
+        } else if (e instanceof SocketTimeoutException) {
+            mCode = ResultCode.TIMEOUT;
+
+        } else if (e instanceof MalformedURLException) {
+            mCode = ResultCode.INCORRECT_ADDRESS;
+
+        } else if (e instanceof UnknownHostException) {
+            mCode = ResultCode.HOST_NOT_AVAILABLE;
+
+        } else if (e instanceof AccountUtils.AccountNotFoundException) {
+            mCode = ResultCode.ACCOUNT_NOT_FOUND;
+
+        } else if (e instanceof AccountsException) {
+            mCode = ResultCode.ACCOUNT_EXCEPTION;
+
+        } else if (e instanceof SSLException || e instanceof RuntimeException) {
+            if(e instanceof SSLPeerUnverifiedException) {
+                mCode = ResultCode.SSL_RECOVERABLE_PEER_UNVERIFIED;
+            } else {
+                CertificateCombinedException se = getCertificateCombinedException(e);
+                if (se != null) {
+                    mException = se;
+                    if (se.isRecoverable()) {
+                        mCode = ResultCode.SSL_RECOVERABLE_PEER_UNVERIFIED;
+                    }
+                } else if (e instanceof RuntimeException) {
+                    mCode = ResultCode.HOST_NOT_AVAILABLE;
+
+                } else {
+                    mCode = ResultCode.SSL_ERROR;
+                }
+            }
+
+        } else if (e instanceof FileNotFoundException) {
+            mCode = ResultCode.LOCAL_FILE_NOT_FOUND;
+
+        } else {
+            mCode = ResultCode.UNKNOWN_ERROR;
+        }
+    }
+
+    /**
+     * Public constructor from separate elements of an HTTP or DAV response.
+     *
+     * To be used when the result needs to be interpreted from the response of an HTTP/DAV method.
+     *
+     * Determines a {@link ResultCode} from the already executed method received as a parameter. Generally,
+     * will depend on the HTTP code and HTTP response headers received. In some cases will inspect also the
+     * response body
+     *
+     * @param httpMethod
+     * @throws IOException
+     */
+    public RemoteOperationResult(HttpBaseMethod httpMethod) throws IOException {
+        this(httpMethod.getStatusCode(),
+                httpMethod.getStatusMessage(),
+                httpMethod.getResponseHeaders()
+        );
+
+        if (mHttpCode == HttpConstants.HTTP_BAD_REQUEST) {   // 400
+            String bodyResponse = httpMethod.getResponseBodyAsString();
+
+            // do not get for other HTTP codes!; could not be available
+            if (bodyResponse != null && bodyResponse.length() > 0) {
+                InputStream is = new ByteArrayInputStream(bodyResponse.getBytes());
+                InvalidCharacterExceptionParser xmlParser = new InvalidCharacterExceptionParser();
+                try {
+                    if (xmlParser.parseXMLResponse(is)) {
+                        mCode = ResultCode.INVALID_CHARACTER_DETECT_IN_SERVER;
+                    }
+
+                } catch (Exception e) {
+                    Log_OC.w(TAG, "Error reading exception from server: " + e.getMessage());
+                    // mCode stays as set in this(success, httpCode, headers)
+                }
+            }
+        }
+
+        // before
+        switch (mHttpCode) {
+            case HttpConstants.HTTP_FORBIDDEN:
+                parseErrorMessageAndSetCode(
+                        httpMethod.getResponseBodyAsString(),
+                        ResultCode.SPECIFIC_FORBIDDEN
+                );
+                break;
+            case HttpConstants.HTTP_UNSUPPORTED_MEDIA_TYPE:
+                parseErrorMessageAndSetCode(
+                        httpMethod.getResponseBodyAsString(),
+                        ResultCode.SPECIFIC_UNSUPPORTED_MEDIA_TYPE
+                );
+                break;
+            case HttpConstants.HTTP_SERVICE_UNAVAILABLE:
+                parseErrorMessageAndSetCode(
+                        httpMethod.getResponseBodyAsString(),
+                        ResultCode.SPECIFIC_SERVICE_UNAVAILABLE
+                );
+                break;
+            case HttpConstants.HTTP_METHOD_NOT_ALLOWED:
+                parseErrorMessageAndSetCode(
+                        httpMethod.getResponseBodyAsString(),
+                        ResultCode.SPECIFIC_METHOD_NOT_ALLOWED
+                );
+            default:
+                break;
+        }
+    }
+
+    /**
+     * Parse the error message included in the body response, if any, and set the specific result
+     * code
+     *
+     * @param bodyResponse okHttp response body
+     * @param resultCode our own custom result code
+     * @throws IOException
+     */
+    private void parseErrorMessageAndSetCode(String bodyResponse, ResultCode resultCode) {
+
+        if (bodyResponse != null && bodyResponse.length() > 0) {
+            InputStream is = new ByteArrayInputStream(bodyResponse.getBytes());
+            ErrorMessageParser xmlParser = new ErrorMessageParser();
+            try {
+                String errorMessage = xmlParser.parseXMLResponse(is);
+                if (errorMessage != "" && errorMessage != null) {
+                    mCode = resultCode;
+                    mHttpPhrase = errorMessage;
+                }
+            } catch (Exception e) {
+                Log_OC.w(TAG, "Error reading exception from server: " + e.getMessage());
+                // mCode stays as set in this(success, httpCode, headers)
+            }
+        }
+    }
+
+    /**
+     * Public constructor from separate elements of an HTTP or DAV response.
+     *
+     * To be used when the result needs to be interpreted from HTTP response elements that could come from
+     * different requests (WARNING: black magic, try to avoid).
+     *
+     *
+     * Determines a {@link ResultCode} depending on the HTTP code and HTTP response headers received.
+     *
+     * @param httpCode    HTTP status code returned by an HTTP/DAV method.
+     * @param httpPhrase  HTTP status line phrase returned by an HTTP/DAV method
+     * @param headers HTTP response header returned by an HTTP/DAV method
+     */
+    public RemoteOperationResult(int httpCode, String httpPhrase, Headers headers) {
+        this(httpCode, httpPhrase);
+        if (headers != null) {
+            for (Map.Entry<String, List<String>> header : headers.toMultimap().entrySet()) {
+                if ("location".equals(header.getKey().toLowerCase())) {
+                    mRedirectedLocation = header.getValue().get(0);
+                    continue;
+                }
+                if ("www-authenticate".equals(header.getKey().toLowerCase())) {
+                    mAuthenticate.add(header.getValue().get(0).toLowerCase());
+                }
+            }
+        }
+        if (isIdPRedirection()) {
+            // overrides default ResultCode.UNKNOWN
+            mCode = ResultCode.UNAUTHORIZED;
+        }
+    }
+
+    /**
+     * Private constructor for results built interpreting a HTTP or DAV response.
+     *
+     * Determines a {@link ResultCode} depending of the type of the exception.
+     *
+     * @param httpCode   HTTP status code returned by the HTTP/DAV method.
+     * @param httpPhrase HTTP status line phrase returned by the HTTP/DAV method
+     */
+    private RemoteOperationResult(int httpCode, String httpPhrase) {
+        mHttpCode = httpCode;
+        mHttpPhrase = httpPhrase;
+
+        if (httpCode > 0) {
+            switch (httpCode) {
+                case HttpConstants.HTTP_UNAUTHORIZED:                    // 401
+                    mCode = ResultCode.UNAUTHORIZED;
+                    break;
+                case HttpConstants.HTTP_FORBIDDEN:                       // 403
+                    mCode = ResultCode.FORBIDDEN;
+                    break;
+                case HttpConstants.HTTP_NOT_FOUND:                       // 404
+                    mCode = ResultCode.FILE_NOT_FOUND;
+                    break;
+                case HttpConstants.HTTP_CONFLICT:                        // 409
+                    mCode = ResultCode.CONFLICT;
+                    break;
+                case HttpConstants.HTTP_INTERNAL_SERVER_ERROR:           // 500
+                    mCode = ResultCode.INSTANCE_NOT_CONFIGURED;     // assuming too much...
+                    break;
+                case HttpConstants.HTTP_SERVICE_UNAVAILABLE:             // 503
+                    mCode = ResultCode.SERVICE_UNAVAILABLE;
+                    break;
+                case HttpConstants.HTTP_INSUFFICIENT_STORAGE:            // 507
+                    mCode = ResultCode.QUOTA_EXCEEDED;              // surprise!
+                    break;
+                default:
+                    mCode = ResultCode.UNHANDLED_HTTP_CODE;         // UNKNOWN ERROR
+                    Log_OC.d(TAG,
+                            "RemoteOperationResult has processed UNHANDLED_HTTP_CODE: " +
+
+                                    mHttpCode + " " + mHttpPhrase
+                    );
+            }
+        }
+    }
+
+
+    public boolean isSuccess() {
+        return mSuccess;
+    }
+
+    public boolean isCancelled() {
+        return mCode == ResultCode.CANCELLED;
+    }
+
+    public int getHttpCode() {
+        return mHttpCode;
+    }
+
+    public String getHttpPhrase() {
+        return mHttpPhrase;
+    }
+
+    public ResultCode getCode() {
+        return mCode;
+    }
+
+    public Exception getException() {
+        return mException;
+    }
+
+    public boolean isSslRecoverableException() {
+        return mCode == ResultCode.SSL_RECOVERABLE_PEER_UNVERIFIED;
+    }
+
+    public boolean isRedirectToNonSecureConnection() {
+        return mCode == ResultCode.OK_REDIRECT_TO_NON_SECURE_CONNECTION;
+    }
+
+    private CertificateCombinedException getCertificateCombinedException(Exception e) {
+        CertificateCombinedException result = null;
+        if (e instanceof CertificateCombinedException) {
+            return (CertificateCombinedException) e;
+        }
+        Throwable cause = mException.getCause();
+        Throwable previousCause = null;
+        while (cause != null && cause != previousCause &&
+                !(cause instanceof CertificateCombinedException)) {
+            previousCause = cause;
+            cause = cause.getCause();
+        }
+        if (cause != null && cause instanceof CertificateCombinedException) {
+            result = (CertificateCombinedException) cause;
+        }
+        return result;
+    }
+
+    public String getLogMessage() {
+
+        if (mException != null) {
+            if (mException instanceof OperationCancelledException) {
+                return "Operation cancelled by the caller";
+
+            } else if (mException instanceof SocketException) {
+                return "Socket exception";
+
+            } else if (mException instanceof SocketTimeoutException) {
+                return "Socket timeout exception";
+
+            } else if (mException instanceof MalformedURLException) {
+                return "Malformed URL exception";
+
+            } else if (mException instanceof UnknownHostException) {
+                return "Unknown host exception";
+
+            } else if (mException instanceof CertificateCombinedException) {
+                if (((CertificateCombinedException) mException).isRecoverable())
+                    return "SSL recoverable exception";
+                else
+                    return "SSL exception";
+
+            } else if (mException instanceof SSLException) {
+                return "SSL exception";
+
+            } else if (mException instanceof DavException) {
+                return "Unexpected WebDAV exception";
+
+            } else if (mException instanceof HttpException) {
+                return "HTTP violation";
+
+            } else if (mException instanceof IOException) {
+                return "Unrecovered transport exception";
+
+            } else if (mException instanceof AccountUtils.AccountNotFoundException) {
+                Account failedAccount =
+                        ((AccountUtils.AccountNotFoundException) mException).getFailedAccount();
+                return mException.getMessage() + " (" +
+                        (failedAccount != null ? failedAccount.name : "NULL") + ")";
+
+            } else if (mException instanceof AccountsException) {
+                return "Exception while using account";
+
+            } else if (mException instanceof JSONException) {
+                return "JSON exception";
+
+            } else {
+                return "Unexpected exception";
+            }
+        }
+
+        if (mCode == ResultCode.INSTANCE_NOT_CONFIGURED) {
+            return "The ownCloud server is not configured!";
+
+        } else if (mCode == ResultCode.NO_NETWORK_CONNECTION) {
+            return "No network connection";
+
+        } else if (mCode == ResultCode.BAD_OC_VERSION) {
+            return "No valid ownCloud version was found at the server";
+
+        } else if (mCode == ResultCode.LOCAL_STORAGE_FULL) {
+            return "Local storage full";
+
+        } else if (mCode == ResultCode.LOCAL_STORAGE_NOT_MOVED) {
+            return "Error while moving file to final directory";
+
+        } else if (mCode == ResultCode.ACCOUNT_NOT_NEW) {
+            return "Account already existing when creating a new one";
+
+        } else if (mCode == ResultCode.ACCOUNT_NOT_THE_SAME) {
+            return "Authenticated with a different account than the one updating";
+
+        } else if (mCode == ResultCode.INVALID_CHARACTER_IN_NAME) {
+            return "The file name contains an forbidden character";
+
+        } else if (mCode == ResultCode.FILE_NOT_FOUND) {
+            return "Local file does not exist";
+
+        } else if (mCode == ResultCode.SYNC_CONFLICT) {
+            return "Synchronization conflict";
+        }
+
+        return "Operation finished with HTTP status code " + mHttpCode + " (" +
+                (isSuccess() ? "success" : "fail") + ")";
+
+    }
+
+    public boolean isServerFail() {
+        return (mHttpCode >= HttpConstants.HTTP_INTERNAL_SERVER_ERROR);
+    }
+
+    public boolean isException() {
+        return (mException != null);
+    }
+
+    public boolean isTemporalRedirection() {
+        return (mHttpCode == 302 || mHttpCode == 307);
+    }
+
+    public String getRedirectedLocation() {
+        return mRedirectedLocation;
+    }
+
+    public boolean isIdPRedirection() {
+        return (mRedirectedLocation != null &&
+                (mRedirectedLocation.toUpperCase().contains("SAML") ||
+                        mRedirectedLocation.toLowerCase().contains("wayf")));
+    }
+
+    /**
+     * Checks if is a non https connection
+     *
+     * @return boolean true/false
+     */
+    public boolean isNonSecureRedirection() {
+        return (mRedirectedLocation != null && !(mRedirectedLocation.toLowerCase().startsWith("https://")));
+    }
+
+    public ArrayList<String> getAuthenticateHeaders() {
+        return mAuthenticate;
+    }
+
+    public String getLastPermanentLocation() {
+        return mLastPermanentLocation;
+    }
+
+    public void setLastPermanentLocation(String lastPermanentLocation) {
+        mLastPermanentLocation = lastPermanentLocation;
+    }
+
+    public void setSuccess(boolean success) {
+        this.mSuccess = success;
+    }
+
+    public void setData(T data) {
+        mData = data;
+    }
+
+    public T getData() {
+        return mData;
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/utils/Log_OC.java

@@ -0,0 +1,206 @@
+package com.owncloud.android.lib.common.utils;
+
+import android.util.Log;
+
+import java.io.BufferedWriter;
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.text.SimpleDateFormat;
+import java.util.Calendar;
+
+public class Log_OC {
+    private static final String SIMPLE_DATE_FORMAT = "yyyy/MM/dd HH:mm:ss";
+    private static final String LOG_FOLDER_NAME = "log";
+    private static final long MAX_FILE_SIZE = 1000000; // 1MB
+
+    private static String mOwncloudDataFolderLog = "owncloud_log";
+
+    private static File mLogFile;
+    private static File mFolder;
+    private static BufferedWriter mBuf;
+
+    private static String[] mLogFileNames = {"currentLog.txt", "olderLog.txt"};
+
+    private static boolean isMaxFileSizeReached = false;
+    private static boolean isEnabled = false;
+
+    public static void setLogDataFolder(String logFolder){
+    	mOwncloudDataFolderLog = logFolder;
+    }
+
+    public static void i(String TAG, String message){
+        Log.i(TAG, message);
+        appendLog(TAG+" : "+ message);
+    }
+
+    public static void d(String TAG, String message){
+        Log.d(TAG, message);
+        appendLog(TAG + " : " + message);
+    }
+    public static void d(String TAG, String message, Exception e) {
+        Log.d(TAG, message, e);
+        appendLog(TAG + " : " + message + " Exception : "+ e.getStackTrace());
+    }
+    public static void e(String TAG, String message){
+        Log.e(TAG, message);
+        appendLog(TAG + " : " + message);
+    }
+    
+    public static void e(String TAG, String message, Throwable e) {
+        Log.e(TAG, message, e);
+        appendLog(TAG+" : " + message +" Exception : " + e.getStackTrace());
+    }
+    
+    public static void v(String TAG, String message){
+        Log.v(TAG, message);
+        appendLog(TAG+" : "+ message);
+    }
+    
+    public static void w(String TAG, String message) {
+        Log.w(TAG, message);
+        appendLog(TAG+" : "+ message);
+    }
+
+    /**
+     * Start doing logging
+     * @param storagePath : directory for keeping logs
+     */
+    synchronized public static void startLogging(String storagePath) {
+		String logPath = storagePath + File.separator +
+			mOwncloudDataFolderLog + File.separator + LOG_FOLDER_NAME;
+        mFolder = new File(logPath);
+        mLogFile = new File(mFolder + File.separator + mLogFileNames[0]);
+
+        boolean isFileCreated = false;
+
+        if (!mFolder.exists()) {
+            mFolder.mkdirs();
+            isFileCreated = true;
+            Log.d("LOG_OC", "Log file created");
+        }
+
+        try { 
+
+            // Create the current log file if does not exist
+            mLogFile.createNewFile();
+            mBuf = new BufferedWriter(new FileWriter(mLogFile, true));
+            isEnabled = true;
+
+            if (isFileCreated) {
+                appendPhoneInfo();
+            }
+
+        } catch (IOException e) {
+            e.printStackTrace();
+        } finally {
+            if(mBuf != null) {
+                try {
+                    mBuf.close();
+                } catch(IOException e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+    }
+
+    synchronized public static void stopLogging() {
+        try {
+			if (mBuf != null)
+                mBuf.close();
+            isEnabled = false;
+
+            mLogFile = null;
+            mFolder = null;
+            mBuf = null;
+            isMaxFileSizeReached = false;
+            isEnabled = false;
+
+        } catch (IOException e) {
+            // Because we are stopping logging, we only log to Android console.
+            Log.e("OC_Log", "Closing log file failed: ", e);
+        } catch (Exception e) {
+            // This catch should never fire because we do null check on mBuf.
+            // But just for the sake of stability let's log this odd situation.
+            // Because we are stopping logging, we only log to Android console.
+            Log.e("OC_Log", "Stopping logging failed: ", e);
+        }
+    }
+
+    /**
+     * Delete history logging
+     */
+    public static void deleteHistoryLogging() {
+        File folderLogs = new File(mFolder + File.separator);
+        if(folderLogs.isDirectory()){
+            String[] myFiles = folderLogs.list();
+            for (int i=0; i<myFiles.length; i++) {
+                File myFile = new File(folderLogs, myFiles[i]);
+                myFile.delete();
+            }
+        }
+    }
+    
+    /**
+     * Append the info of the device
+     */
+    private static void appendPhoneInfo() {
+        appendLog("Model : " + android.os.Build.MODEL);
+        appendLog("Brand : " + android.os.Build.BRAND);
+        appendLog("Product : " + android.os.Build.PRODUCT);
+        appendLog("Device : " + android.os.Build.DEVICE);
+        appendLog("Version-Codename : " + android.os.Build.VERSION.CODENAME);
+        appendLog("Version-Release : " + android.os.Build.VERSION.RELEASE);
+    }
+    
+    /**
+     * Append to the log file the info passed
+     * @param text : text for adding to the log file
+     */
+    synchronized private static void appendLog(String text) {
+
+        if (isEnabled) {
+
+            if (isMaxFileSizeReached) {
+
+                // Move current log file info to another file (old logs)
+                File olderFile = new File(mFolder + File.separator + mLogFileNames[1]);
+                if (mLogFile.exists()) {
+                    mLogFile.renameTo(olderFile);
+                }
+
+                // Construct a new file for current log info
+                mLogFile = new File(mFolder + File.separator + mLogFileNames[0]);
+                isMaxFileSizeReached = false;
+            }
+
+	        String timeStamp = new SimpleDateFormat(SIMPLE_DATE_FORMAT).format(Calendar.getInstance().getTime());
+
+	        try {
+	            mBuf = new BufferedWriter(new FileWriter(mLogFile, true));
+	            mBuf.newLine();
+	            mBuf.write(timeStamp);
+	            mBuf.newLine();
+	            mBuf.write(text);
+	            mBuf.newLine();
+	        } catch (IOException e) {
+	            e.printStackTrace();
+	        } finally {
+                try {
+                    mBuf.close();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+
+            // Check if current log file size is bigger than the max file size defined
+            if (mLogFile.length() > MAX_FILE_SIZE) {
+                isMaxFileSizeReached = true;
+            }
+        }
+    }
+
+    public static String[] getLogFileNames() {
+        return mLogFileNames;
+    }
+}

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/utils/RandomUtils.java

@@ -0,0 +1,71 @@
+/* ownCloud Android Library is available under MIT license
+ *   Copyright (C) 2018 ownCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ *
+ */
+
+package com.owncloud.android.lib.common.utils;
+
+import java.util.Random;
+import java.util.UUID;
+
+/**
+ * Class with methods to generate random values
+ *
+ * @author David González Verdugo
+ */
+public class RandomUtils {
+
+    private static final String CANDIDATECHARS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" +
+            "1234567890-+/_=.:";
+
+    /**
+     * @param length the number of random chars to be generated
+     *
+     * @return String containing random chars
+     */
+    public static String generateRandomString(int length) {
+        StringBuilder sb = new StringBuilder();
+        Random random = new Random();
+        for (int i = 0; i < length; i++) {
+            sb.append(CANDIDATECHARS.charAt(random.nextInt(CANDIDATECHARS.length())));
+        }
+
+        return sb.toString();
+    }
+
+    /**
+     * @param min minimum integer to obtain randomly
+     * @param max maximum integer to obtain randomly
+     * @return random integer between min and max
+     */
+    public static int generateRandomInteger(int min, int max) {
+        Random r = new Random();
+        return r.nextInt(max-min) + min;
+    }
+
+    /**
+     * @return random UUID
+     */
+    public static String generateRandomUUID() {
+        return UUID.randomUUID().toString();
+    }
+}