Log http body if it is not binary

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

@@ -29,8 +29,9 @@ object LogBuilder {
     fun logHttp(
         networkPetition: NetworkPetition,
         networkNode: NetworkNode,
+        requestId: String? = "",
         description: String
-    ) = Timber.d("[Network, $networkPetition] [$networkNode] $description")
+    ) = Timber.d("[Network, $networkPetition] [$networkNode] [$requestId] $description")
 }
 
 enum class NetworkPetition {

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

@@ -23,37 +23,145 @@
  */
 package com.owncloud.android.lib.common.http
 
+import com.owncloud.android.lib.common.http.HttpConstants.OC_X_REQUEST_ID
 import com.owncloud.android.lib.common.http.LogBuilder.logHttp
 import com.owncloud.android.lib.common.http.NetworkNode.BODY
 import com.owncloud.android.lib.common.http.NetworkNode.HEADER
 import com.owncloud.android.lib.common.http.NetworkNode.INFO
 import com.owncloud.android.lib.common.http.NetworkPetition.REQUEST
 import com.owncloud.android.lib.common.http.NetworkPetition.RESPONSE
+import okhttp3.Headers
 import okhttp3.Interceptor
+import okhttp3.RequestBody
 import okhttp3.Response
+import okhttp3.ResponseBody
+import okio.Buffer
+import java.nio.charset.Charset
+import java.nio.charset.StandardCharsets
+import kotlin.math.max
 
 class LogInterceptor : Interceptor {
 
     override fun intercept(chain: Interceptor.Chain): Response {
 
-        val response = chain.proceed(chain.request())
+        if (!httpLogsEnabled) {
+            return chain.proceed(chain.request())
+        }
+
+        val request = chain.request().also {
+            val requestId = it.headers[OC_X_REQUEST_ID]
+            logHttp(REQUEST, INFO, requestId, "Type: ${it.method} URL: ${it.url}")
+            logHeaders(requestId, it.headers, REQUEST)
+            logRequestBody(requestId, it.body)
+        }
+
+        val response = chain.proceed(request)
 
         return response.also {
-            if (httpLogsEnabled) {
+            val requestId = it.request.headers[OC_X_REQUEST_ID]
-                // Log request
+            logHttp(
-                logHttp(REQUEST, INFO, "Type: ${it.request.method} URL: ${it.request.url}")
+                RESPONSE,
-                it.request.headers.forEach { header -> logHttp(REQUEST, HEADER, header.toString()) }
+                INFO,
-                logHttp(REQUEST, BODY, it.request.body.toString())
+                requestId,
+                "Code: ${it.code}  Message: ${it.message} IsSuccessful: ${it.isSuccessful}"
+            )
+            logHeaders(requestId, it.headers, RESPONSE)
+            logResponseBody(requestId, it.body)
+        }
+    }
 
-                // Log response
+    private fun logHeaders(requestId: String?, headers: Headers, networkPetition: NetworkPetition) {
-                logHttp(RESPONSE, INFO, "Code: ${it.code}  Message: ${it.message} IsSuccessful: ${it.isSuccessful}")
+        headers.forEach { header ->
-                it.headers.forEach { header -> logHttp(RESPONSE, HEADER, header.toString()) }
+            logHttp(networkPetition, HEADER, requestId, "${header.first}: ${header.second}")
-                logHttp(RESPONSE, BODY, it.body.toString())
         }
     }
+
+    private fun logRequestBody(requestId: String?, requestBodyParam: RequestBody?) {
+        requestBodyParam?.let { requestBody ->
+
+            if (requestBody.isOneShot()) {
+                logHttp(REQUEST, BODY, requestId, "One shot body -- Omitted")
+                return@let
+            }
+
+            if (requestBody.isDuplex()) {
+                logHttp(REQUEST, BODY, requestId, "Duplex body -- Omitted")
+                return@let
+            }
+
+            val buffer = Buffer()
+            requestBody.writeTo(buffer)
+
+            val contentType = requestBody.contentType()
+            val charset: Charset = contentType?.charset(StandardCharsets.UTF_8) ?: StandardCharsets.UTF_8
+
+            logHttp(REQUEST, BODY, requestId, "Length: ${requestBody.contentLength()} byte body")
+            logHttp(REQUEST, BODY, requestId, "Type: ${requestBody.contentType()}")
+            logHttp(REQUEST, BODY, requestId, "--> Body start for request")
+
+            if (buffer.isProbablyUtf8()) {
+                if (requestBody.contentLength() < LIMIT_BODY_LOG) {
+                    logHttp(REQUEST, BODY, requestId, buffer.readString(charset))
+                } else {
+                    logHttp(REQUEST, BODY, requestId, buffer.readString(LIMIT_BODY_LOG, charset))
+                }
+                logHttp(
+                    REQUEST,
+                    BODY,
+                    requestId,
+                    "<-- Body end for request -- Omitted: ${max(0, requestBody.contentLength() - LIMIT_BODY_LOG)} bytes"
+                )
+            } else {
+                logHttp(
+                    REQUEST,
+                    BODY,
+                    requestId,
+                    "<-- Body end for request -- Binary -- Omitted: ${requestBody.contentLength()} bytes"
+                )
+            }
+
+        } ?: logHttp(REQUEST, BODY, requestId, "Empty body")
+    }
+
+    private fun logResponseBody(requestId: String?, responseBodyParam: ResponseBody?) {
+        responseBodyParam?.let { responseBody ->
+
+            val contentType = responseBody.contentType()
+            val charset: Charset = contentType?.charset(StandardCharsets.UTF_8) ?: StandardCharsets.UTF_8
+
+            logHttp(RESPONSE, BODY, requestId, "Length: ${responseBody.contentLength()} byte body")
+            logHttp(RESPONSE, BODY, requestId, "Type: ${responseBody.contentType()}")
+            logHttp(RESPONSE, BODY, requestId, "--> Body start for request")
+
+            val source = responseBody.source()
+            source.request(LIMIT_BODY_LOG)
+            val buffer = source.buffer
+
+            if (!buffer.isProbablyUtf8()) {
+                logHttp(
+                    REQUEST,
+                    BODY,
+                    requestId,
+                    "<-- Body end for request -- Binary -- Omitted: ${responseBody.contentLength()} bytes"
+                )
+            }
+
+            if (responseBody.contentLength() < LIMIT_BODY_LOG) {
+                logHttp(REQUEST, BODY, requestId, buffer.clone().readString(charset))
+            } else {
+                logHttp(REQUEST, BODY, requestId, buffer.clone().readString(LIMIT_BODY_LOG, charset))
+            }
+            logHttp(
+                REQUEST,
+                BODY,
+                requestId,
+                "<-- Body end for request -- Omitted: ${max(0, responseBody.contentLength() - LIMIT_BODY_LOG)} bytes"
+            )
+        } ?: logHttp(RESPONSE, BODY, requestId, "Empty body")
     }
 
     companion object {
         var httpLogsEnabled: Boolean = false
+        private const val LIMIT_BODY_LOG: Long = 1024
     }
 }

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/http/utf8.kt

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2015 Square, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.owncloud.android.lib.common.http
+
+import java.io.EOFException
+import okio.Buffer
+
+/**
+ * Returns true if the body in question probably contains human readable text. Uses a small
+ * sample of code points to detect unicode control characters commonly used in binary file
+ * signatures.
+ */
+internal fun Buffer.isProbablyUtf8(): Boolean {
+    try {
+        val prefix = Buffer()
+        val byteCount = size.coerceAtMost(64)
+        copyTo(prefix, 0, byteCount)
+        for (i in 0 until 16) {
+            if (prefix.exhausted()) {
+                break
+            }
+            val codePoint = prefix.readUtf8CodePoint()
+            if (Character.isISOControl(codePoint) && !Character.isWhitespace(codePoint)) {
+                return false
+            }
+        }
+        return true
+    } catch (_: EOFException) {
+        return false // Truncated UTF-8 sequence.
+    }
+}