Various fixes

Authentication/AuthenticationProvider.cs

@@ -4,15 +4,16 @@ namespace CryptoExchange.Net.Authentication
 {
     public abstract class AuthenticationProvider
     {
-        protected ApiCredentials credentials;
+        public ApiCredentials Credentials { get; }
 
         protected AuthenticationProvider(ApiCredentials credentials)
         {
-            this.credentials = credentials;
+            Credentials = credentials;
         }
 
         public abstract string AddAuthenticationToUriString(string uri, bool signed);
         public abstract IRequest AddAuthenticationToRequest(IRequest request, bool signed);
+        public abstract string Sign(string toSign);
 
         protected string ByteToString(byte[] buff)
         {

CryptoExchange.Net.csproj

@@ -7,7 +7,7 @@
   <PropertyGroup>
     <PackageId>CryptoExchange.Net</PackageId>
 	<Authors>JKorf</Authors>
-    <PackageVersion>0.0.2</PackageVersion>
+    <PackageVersion>0.0.4</PackageVersion>
 	<PackageRequireLicenseAcceptance>false</PackageRequireLicenseAcceptance>
     <PackageProjectUrl>https://github.com/JKorf/CryptoExchange.Net</PackageProjectUrl>
 	<PackageLicenseUrl>https://github.com/JKorf/CryptoExchange.Net/blob/master/LICENSE</PackageLicenseUrl>

Error.cs

@@ -30,6 +30,10 @@
     public class ServerError: Error
     {
         public ServerError(string message) : base(3, "Server error: " + message) { }
+
+        public ServerError(int code, string message) : base(code, message)
+        {
+        }
     }
 
     public class WebError : Error

ExchangeClient.cs

@@ -22,13 +22,13 @@ namespace CryptoExchange.Net
         protected Log log;
         protected ApiProxy apiProxy;
 
-        private AuthenticationProvider authProvider;
+        protected AuthenticationProvider authProvider;
         private List<IRateLimiter> rateLimiters;
         
-        protected ExchangeClient(ExchangeOptions exchangeOptions, AuthenticationProvider authentictationProvider)
+        protected ExchangeClient(ExchangeOptions exchangeOptions, AuthenticationProvider authenticationProvider)
         {
             log = new Log();
-            authProvider = authentictationProvider;
+            authProvider = authenticationProvider;
             Configure(exchangeOptions);
         }
 
@@ -80,6 +80,25 @@ namespace CryptoExchange.Net
             if(signed && authProvider == null)
                 return new CallResult<T>(null, new NoApiCredentialsError());
 
+            var request = ConstructRequest(uri, method, parameters, signed);
+
+            if (apiProxy != null)
+                request.SetProxy(apiProxy.Host, apiProxy.Port);
+
+            foreach (var limiter in rateLimiters)
+            {
+                var limitedBy = limiter.LimitRequest(uri.AbsolutePath);
+                if (limitedBy > 0)
+                    log.Write(LogVerbosity.Debug, $"Request {uri.AbsolutePath} was limited by {limitedBy}ms by {limiter.GetType().Name}");
+            }
+
+            log.Write(LogVerbosity.Debug, $"Sending request to {request.Uri}");
+            var result = await ExecuteRequest(request).ConfigureAwait(false);
+            return result.Error != null ? new CallResult<T>(null, result.Error) : Deserialize<T>(result.Data);
+        }
+
+        protected virtual IRequest ConstructRequest(Uri uri, string method, Dictionary<string, object> parameters, bool signed)
+        {
             var uriString = uri.ToString();
 
             if (parameters != null)
@@ -96,22 +115,10 @@ namespace CryptoExchange.Net
             var request = RequestFactory.Create(uriString);
             request.Method = method;
 
-            if (apiProxy != null)
-                request.SetProxy(apiProxy.Host, apiProxy.Port);
-            
             if (authProvider != null)
                 request = authProvider.AddAuthenticationToRequest(request, signed);
 
-            foreach (var limiter in rateLimiters)
+            return request;
-            {
-                var limitedBy = limiter.LimitRequest(uri.AbsolutePath);
-                if (limitedBy > 0)
-                    log.Write(LogVerbosity.Debug, $"Request {uri.AbsolutePath} was limited by {limitedBy}ms by {limiter.GetType().Name}");
-            }
-
-            log.Write(LogVerbosity.Debug, $"Sending request to {uriString}");
-            var result = await ExecuteRequest(request);
-            return result.Error != null ? new CallResult<T>(null, result.Error) : Deserialize<T>(result.Data);
         }
 
         private async Task<CallResult<string>> ExecuteRequest(IRequest request)
@@ -119,7 +126,7 @@ namespace CryptoExchange.Net
             var returnedData = "";
             try
             {
-                var response = request.GetResponse();
+                var response = await request.GetResponse().ConfigureAwait(false);
                 using (var reader = new StreamReader(response.GetResponseStream()))
                 {
                     returnedData = await reader.ReadToEndAsync().ConfigureAwait(false);
@@ -129,11 +136,11 @@ namespace CryptoExchange.Net
             catch (WebException we)
             {
                 var response = (HttpWebResponse)we.Response;
-                string responseData = null;
                 try
                 {
                     var reader = new StreamReader(response.GetResponseStream());
-                    responseData = reader.ReadToEnd();
+                    var responseData = await reader.ReadToEndAsync().ConfigureAwait(false);
+                    return new CallResult<string>(null, ParseErrorResponse(responseData));
                 }
                 catch (Exception)
                 {
@@ -143,9 +150,6 @@ namespace CryptoExchange.Net
                 if (response == null)
                     return new CallResult<string>(null, new WebError(infoMessage));
                 
-                if (responseData != null)
-                    infoMessage = "Server returned error: " + responseData;
-                else
                 infoMessage = $"Status: {response.StatusCode}-{response.StatusDescription}, Message: {we.Message}";
                 return new CallResult<string>(null, new ServerError(infoMessage));
             }
@@ -155,6 +159,11 @@ namespace CryptoExchange.Net
             }
         }
 
+        protected virtual Error ParseErrorResponse(string error)
+        {
+            return new ServerError(error);
+        }
+
         private CallResult<T> Deserialize<T>(string data) where T: class
         {
             try

Interfaces/IRequest.cs

@@ -1,5 +1,7 @@
 using System;
+using System.IO;
 using System.Net;
+using System.Threading.Tasks;
 
 namespace CryptoExchange.Net.Interfaces
 {
@@ -10,6 +12,12 @@ namespace CryptoExchange.Net.Interfaces
         string Method { get; set; }
 
         void SetProxy(string host, int port);
-        IResponse GetResponse();
+
+        string ContentType { get; set; }
+        string Accept { get; set; }
+        long ContentLength { get; set; }
+
+        Task<Stream> GetRequestStream();
+        Task<IResponse> GetResponse();
     }
 }

Requests/Request.cs

@@ -1,5 +1,7 @@
 using System;
+using System.IO;
 using System.Net;
+using System.Threading.Tasks;
 using CryptoExchange.Net.Interfaces;
 
 namespace CryptoExchange.Net.Requests
@@ -18,11 +20,30 @@ namespace CryptoExchange.Net.Requests
             get => request.Headers;
             set => request.Headers = value;
         }
+        public string ContentType
+        {
+            get => request.ContentType;
+            set => request.ContentType = value;
+        }
+
+        public string Accept
+        {
+            get => ((HttpWebRequest)request).Accept;
+            set => ((HttpWebRequest)request).Accept = value;
+        }
+
+        public long ContentLength
+        {
+            get => ((HttpWebRequest)request).ContentLength;
+            set => ((HttpWebRequest)request).ContentLength = value;
+        }
+
         public string Method
         {
             get => request.Method;
             set => request.Method = value;
         }
+
         public Uri Uri => request.RequestUri;
 
         public void SetProxy(string host, int port)
@@ -30,9 +51,14 @@ namespace CryptoExchange.Net.Requests
             request.Proxy = new WebProxy(host, port);
         }
 
-        public IResponse GetResponse()
+        public async Task<Stream> GetRequestStream()
         {
-            return new Response(request.GetResponse());
+            return await request.GetRequestStreamAsync();
+        }
+
+        public async Task<IResponse> GetResponse()
+        {
+            return new Response(await request.GetResponseAsync().ConfigureAwait(false));
         }
     }
 }