private async Task <T> SendWebRequestAsync <T>(string httpMethod, string absoluteUrl, object request, CancellationToken token, bool recall = false)
{
if (httpMethod == null)
{
throw new ArgumentNullException(nameof(httpMethod));
}
this.PopulateRequestMetadata(request);
var requestUri = absoluteUrl;
var hasQueryString = request != null && !HttpUtils.HasRequestBody(httpMethod);
if (hasQueryString)
{
var queryString = QueryStringSerializer.SerializeToString(request);
if (!string.IsNullOrEmpty(queryString))
{
requestUri += "?" + queryString;
}
}
var webReq = this.CreateHttpWebRequest(requestUri);
var timedOut = false;
ITimer timer = null;
timer = PclExportClient.Instance.CreateTimer(state =>
{
timedOut = true;
webReq?.Abort();
webReq = null;
timer?.Cancel();
timer = null;
}, this.Timeout.GetValueOrDefault(DefaultTimeout), this);
Exception ResolveException(Exception ex)
{
if (token.IsCancellationRequested)
{
return(new OperationCanceledException(token));
}
if (timedOut)
{
return(PclExportClient.Instance.CreateTimeoutException(ex, "The request timed out"));
}
return(ex);
}
bool returningWebResponse = false;
HttpWebResponse webRes = null;
T Complete(T response)
{
timer.Cancel();
PclExportClient.Instance.SynchronizeCookies(this);
ResultsFilterResponse?.Invoke(webRes, response, httpMethod, absoluteUrl, request);
return(response);
}
webReq.Accept = ContentType;
if (this.EmulateHttpViaPost)
{
webReq.Method = "POST";
webReq.Headers[HttpHeaders.XHttpMethodOverride] = httpMethod;
}
else
{
webReq.Method = httpMethod;
}
PclExportClient.Instance.AddHeader(webReq, Headers);
PclExport.Instance.Config(webReq, userAgent: UserAgent);
if (this.authInfo != null && !string.IsNullOrEmpty(this.UserName))
{
webReq.AddAuthInfo(this.UserName, this.Password, authInfo);
}
else if (this.BearerToken != null)
{
webReq.Headers[HttpHeaders.Authorization] = "Bearer " + this.BearerToken;
}
else if (this.Credentials != null)
{
webReq.Credentials = this.Credentials;
}
else if (this.AlwaysSendBasicAuthHeader)
{
webReq.AddBasicAuth(this.UserName, this.Password);
}
if (!DisableAutoCompression)
{
PclExport.Instance.AddCompression(webReq);
}
ApplyWebRequestFilters(webReq);
try
{
if (HttpUtils.HasRequestBody(webReq.Method))
{
webReq.ContentType = ContentType;
if (RequestCompressionType != null)
{
webReq.Headers[HttpHeaders.ContentEncoding] = RequestCompressionType;
}
using (var requestStream = await webReq.GetRequestStreamAsync().ConfigureAwait(false))
{
token.ThrowIfCancellationRequested();
if (request != null)
{
StreamSerializer(null, request, requestStream);
}
}
}
}
catch (Exception ex)
{
if (Log.IsDebugEnabled)
{
Log.Debug($"Error Sending Request: {ex.Message}", ex);
}
throw HandleResponseError <T>(ResolveException(ex), requestUri, request);
}
try
{
webRes = (HttpWebResponse)await webReq.GetResponseAsync().ConfigureAwait(false);
{
token.ThrowIfCancellationRequested();
ApplyWebResponseFilters(webRes);
returningWebResponse = typeof(T) == typeof(HttpWebResponse);
if (returningWebResponse)
{
return(Complete((T)(object)webRes));
}
var responseStream = webRes.ResponseStream();
var responseBodyLength = webRes.ContentLength;
var bufferRead = new byte[BufferSize];
var totalRead = 0;
int read;
var ms = MemoryStreamFactory.GetStream();
while ((read = await responseStream.ReadAsync(bufferRead, 0, bufferRead.Length, token).ConfigureAwait(false)) != 0)
{
ms.Write(bufferRead, 0, read);
totalRead += read;
OnDownloadProgress?.Invoke(totalRead, responseBodyLength);
}
try
{
ms.Position = 0;
if (typeof(T) == typeof(Stream))
{
return(Complete((T)(object)ms));
}
else
{
var stream = ms;
try
{
if (typeof(T) == typeof(string))
{
return(Complete((T)(object)stream.ReadToEnd()));
}
else if (typeof(T) == typeof(byte[]))
{
return(Complete((T)(object)stream.ToArray()));
}
else
{
return(Complete((T)this.StreamDeserializer(typeof(T), stream)));
}
}
finally
{
if (stream.CanRead)
{
stream.Dispose(); // Not yet disposed, but could've been.
}
}
}
}
catch (Exception ex)
{
if (Log.IsDebugEnabled)
{
Log.Debug($"Error Reading Response Error: {ex.Message}", ex);
}
throw;
}
finally
{
responseStream.Close();
}
}
}
catch (Exception ex)
{
var webEx = ex as WebException;
var firstCall = !recall;
if (firstCall && WebRequestUtils.ShouldAuthenticate(webEx,
(!string.IsNullOrEmpty(UserName) && !string.IsNullOrEmpty(Password)) ||
Credentials != null ||
BearerToken != null ||
RefreshToken != null ||
OnAuthenticationRequired != null))
{
try
{
if (RefreshToken != null)
{
var refreshRequest = new GetAccessToken {
RefreshToken = RefreshToken
};
var uri = this.RefreshTokenUri ??
this.BaseUri.CombineWith(refreshRequest.ToPostUrl());
GetAccessTokenResponse tokenResponse;
try
{
tokenResponse = uri.PostJsonToUrl(refreshRequest)
.FromJson <GetAccessTokenResponse>();
}
catch (WebException refreshEx)
{
var webServiceEx = ServiceClientBase.ToWebServiceException(refreshEx,
stream => StreamDeserializer(typeof(T), stream),
ContentType);
if (webServiceEx != null)
{
throw new RefreshTokenException(webServiceEx);
}
throw new RefreshTokenException(refreshEx.Message, refreshEx);
}
var accessToken = tokenResponse?.AccessToken;
if (string.IsNullOrEmpty(accessToken))
{
throw new RefreshTokenException("Could not retrieve new AccessToken from: " + uri);
}
var refreshClient = webReq = (HttpWebRequest)WebRequest.Create(requestUri);
if (this.CookieContainer.GetTokenCookie(BaseUri) != null)
{
this.CookieContainer.SetTokenCookie(accessToken, BaseUri);
refreshClient.CookieContainer.SetTokenCookie(BaseUri, accessToken);
}
else
{
refreshClient.AddBearerToken(this.BearerToken = accessToken);
}
return(await SendWebRequestAsync <T>(httpMethod, absoluteUrl, request, token, recall : true).ConfigureAwait(false));
}
OnAuthenticationRequired?.Invoke();
var newReq = (HttpWebRequest)WebRequest.Create(requestUri);
if (StoreCookies)
{
newReq.CookieContainer = CookieContainer;
}
HandleAuthException(ex, webReq);
return(await SendWebRequestAsync <T>(httpMethod, absoluteUrl, request, token, recall : true).ConfigureAwait(false));
}
catch (WebServiceException)
{
throw;
}
catch (Exception /*subEx*/)
{
throw HandleResponseError <T>(ResolveException(ex), requestUri, request);
}
}
if (ExceptionFilter != null && webEx?.Response != null)
{
var cachedResponse = ExceptionFilter(webEx, webEx.Response, requestUri, typeof(T));
if (cachedResponse is T variable)
{
return(variable);
}
}
throw HandleResponseError <T>(ResolveException(ex), requestUri, request);
}
finally
{
if (!returningWebResponse)
{
webRes?.Dispose();
}
}
}
private void HandleResponseError <TResponse>(Exception exception, AsyncState <TResponse> state)
{
var webEx = exception as WebException;
if (PclExportClient.Instance.IsWebException(webEx))
{
var errorResponse = (HttpWebResponse)webEx.Response;
Log.Error(webEx);
if (Log.IsDebugEnabled)
{
Log.Debug($"Status Code : {errorResponse.StatusCode}");
Log.Debug($"Status Description : {errorResponse.StatusDescription}");
}
var serviceEx = new WebServiceException(errorResponse.StatusDescription)
{
StatusCode = (int)errorResponse.StatusCode,
StatusDescription = errorResponse.StatusDescription,
ResponseHeaders = errorResponse.Headers
};
try
{
using (var stream = errorResponse.GetResponseStream())
{
var bytes = stream.ReadFully();
serviceEx.ResponseBody = bytes.FromUtf8Bytes();
var errorResponseType = WebRequestUtils.GetErrorResponseDtoType <TResponse>(state.Request);
if (stream.CanSeek)
{
PclExport.Instance.ResetStream(stream);
serviceEx.ResponseDto = this.StreamDeserializer(errorResponseType, stream);
}
else //Android
{
using (var ms = MemoryStreamFactory.GetStream(bytes))
{
serviceEx.ResponseDto = this.StreamDeserializer(errorResponseType, ms);
}
}
state.HandleError(serviceEx.ResponseDto, serviceEx);
}
}
catch (Exception innerEx)
{
// Oh, well, we tried
Log.Debug($"WebException Reading Response Error: {innerEx.Message}", innerEx);
state.HandleError(default(TResponse), new WebServiceException(errorResponse.StatusDescription, innerEx)
{
StatusCode = (int)errorResponse.StatusCode,
StatusDescription = errorResponse.StatusDescription,
ResponseHeaders = errorResponse.Headers
});
}
return;
}
var authEx = exception as AuthenticationException;
if (authEx != null)
{
var customEx = WebRequestUtils.CreateCustomException(state.Url, authEx);
Log.Debug($"AuthenticationException: {customEx.Message}", customEx);
state.HandleError(default(TResponse), authEx);
}
Log.Debug($"Exception Reading Response Error: {exception.Message}", exception);
state.HandleError(default(TResponse), exception);
CancelAsyncFn = null;
}
private void HandleResponseError <TResponse>(Exception exception, AsyncState <TResponse> state)
{
var webEx = exception as WebException;
if (webEx.IsWebException())
{
var errorResponse = ((HttpWebResponse)webEx.Response);
Log.Error(webEx);
Log.DebugFormat("Status Code : {0}", errorResponse.StatusCode);
Log.DebugFormat("Status Description : {0}", errorResponse.StatusDescription);
var serviceEx = new WebServiceException(errorResponse.StatusDescription)
{
StatusCode = (int)errorResponse.StatusCode,
StatusDescription = errorResponse.StatusDescription,
};
try
{
using (var stream = errorResponse.GetResponseStream())
{
//Uncomment to Debug exceptions:
//var strResponse = new StreamReader(stream).ReadToEnd();
//Console.WriteLine("Response: " + strResponse);
//stream.Position = 0;
serviceEx.ResponseBody = stream.ReadFully().FromUtf8Bytes();
PclExport.Instance.ResetStream(stream);
serviceEx.ResponseDto = this.StreamDeserializer(typeof(TResponse), stream);
state.HandleError((TResponse)serviceEx.ResponseDto, serviceEx);
}
}
catch (Exception innerEx)
{
// Oh, well, we tried
Log.Debug(string.Format("WebException Reading Response Error: {0}", innerEx.Message), innerEx);
state.HandleError(default(TResponse), new WebServiceException(errorResponse.StatusDescription, innerEx)
{
StatusCode = (int)errorResponse.StatusCode,
StatusDescription = errorResponse.StatusDescription,
});
}
return;
}
var authEx = exception as AuthenticationException;
if (authEx != null)
{
var customEx = WebRequestUtils.CreateCustomException(state.Url, authEx);
Log.Debug(string.Format("AuthenticationException: {0}", customEx.Message), customEx);
state.HandleError(default(TResponse), authEx);
}
Log.Debug(string.Format("Exception Reading Response Error: {0}", exception.Message), exception);
state.HandleError(default(TResponse), exception);
CancelAsyncFn = null;
}
private void ResponseCallback <T>(IAsyncResult asyncResult)
{
var requestState = (AsyncState <T>)asyncResult.AsyncState;
try
{
requestState.Token.ThrowIfCancellationRequested();
var webRequest = requestState.WebRequest;
requestState.WebResponse = (HttpWebResponse)webRequest.EndGetResponse(asyncResult);
requestState.OnResponseInit?.Invoke(requestState.WebResponse);
if (requestState.ResponseContentLength == default(long))
{
requestState.ResponseContentLength = requestState.WebResponse.ContentLength;
}
ApplyWebResponseFilters(requestState.WebResponse);
if (typeof(T) == typeof(HttpWebResponse))
{
requestState.HandleSuccess((T)(object)requestState.WebResponse);
return;
}
// Read the response into a Stream object.
#if NETSTANDARD1_1 || NETSTANDARD1_6
var responseStream = requestState.WebResponse.GetResponseStream()
.Decompress(requestState.WebResponse.Headers[HttpHeaders.ContentEncoding]);
#else
var responseStream = requestState.WebResponse.GetResponseStream();
#endif
requestState.ResponseStream = responseStream;
var task = responseStream.ReadAsync(requestState.BufferRead, 0, BufferSize);
ReadCallBack(task, requestState);
}
catch (Exception ex)
{
var webEx = ex as WebException;
var firstCall = Interlocked.Increment(ref requestState.RequestCount) == 1;
if (firstCall && WebRequestUtils.ShouldAuthenticate(webEx,
(!string.IsNullOrEmpty(UserName) && !string.IsNullOrEmpty(Password)) ||
Credentials != null ||
BearerToken != null ||
RefreshToken != null ||
OnAuthenticationRequired != null))
{
try
{
if (RefreshToken != null)
{
var refreshRequest = new GetAccessToken {
RefreshToken = RefreshToken
};
var uri = this.RefreshTokenUri ?? this.BaseUri.CombineWith(refreshRequest.ToPostUrl());
GetAccessTokenResponse tokenResponse;
try
{
tokenResponse = uri.PostJsonToUrl(refreshRequest).FromJson <GetAccessTokenResponse>();
}
catch (WebException refreshEx)
{
var webServiceEx = ServiceClientBase.ToWebServiceException(refreshEx,
stream => StreamDeserializer(typeof(T), stream),
ContentType);
if (webServiceEx != null)
{
throw new RefreshTokenException(webServiceEx);
}
throw new RefreshTokenException(refreshEx.Message, refreshEx);
}
var accessToken = tokenResponse?.AccessToken;
if (string.IsNullOrEmpty(accessToken))
{
throw new RefreshTokenException("Could not retrieve new AccessToken from: " + uri);
}
var refreshClient = requestState.WebRequest =
(HttpWebRequest)WebRequest.Create(requestState.Url);
if (this.CookieContainer.GetTokenCookie(BaseUri) != null)
{
this.CookieContainer.SetTokenCookie(accessToken, BaseUri);
refreshClient.CookieContainer.SetTokenCookie(BaseUri, accessToken);
}
else
{
refreshClient.AddBearerToken(this.BearerToken = accessToken);
}
SendWebRequestAsync(
requestState.HttpMethod, requestState.Request,
requestState, requestState.WebRequest);
return;
}
OnAuthenticationRequired?.Invoke();
requestState.WebRequest = (HttpWebRequest)WebRequest.Create(requestState.Url);
if (StoreCookies)
{
requestState.WebRequest.CookieContainer = CookieContainer;
}
HandleAuthException(ex, requestState.WebRequest);
SendWebRequestAsync(
requestState.HttpMethod, requestState.Request,
requestState, requestState.WebRequest);
}
catch (WebServiceException rethrow)
{
requestState.HandleError(default(T), rethrow);
}
catch (Exception /*subEx*/)
{
HandleResponseError(ex, requestState);
}
return;
}
if (ExceptionFilter != null && webEx != null && webEx.Response != null)
{
var cachedResponse = ExceptionFilter(webEx, webEx.Response, requestState.Url, typeof(T));
if (cachedResponse is T)
{
requestState.OnSuccess((T)cachedResponse);
return;
}
}
HandleResponseError(ex, requestState);
}
}
private void ResponseCallback <T>(IAsyncResult asyncResult)
{
var requestState = (AsyncState <T>)asyncResult.AsyncState;
try
{
var webRequest = requestState.WebRequest;
requestState.WebResponse = (HttpWebResponse)webRequest.EndGetResponse(asyncResult);
if (requestState.ResponseContentLength == default(long))
{
requestState.ResponseContentLength = requestState.WebResponse.ContentLength;
}
ApplyWebResponseFilters(requestState.WebResponse);
if (typeof(T) == typeof(HttpWebResponse))
{
requestState.HandleSuccess((T)(object)requestState.WebResponse);
return;
}
// Read the response into a Stream object.
var responseStream = requestState.WebResponse.GetResponseStream();
requestState.ResponseStream = responseStream;
var task = responseStream.ReadAsync(requestState.BufferRead, 0, BufferSize);
ReadCallBack(task, requestState);
}
catch (Exception ex)
{
var firstCall = Interlocked.Increment(ref requestState.RequestCount) == 1;
if (firstCall && WebRequestUtils.ShouldAuthenticate(ex, this.UserName, this.Password))
{
try
{
requestState.WebRequest = (HttpWebRequest)WebRequest.Create(requestState.Url);
if (StoreCookies)
{
requestState.WebRequest.CookieContainer = CookieContainer;
}
requestState.WebRequest.AddBasicAuth(this.UserName, this.Password);
if (OnAuthenticationRequired != null)
{
OnAuthenticationRequired(requestState.WebRequest);
}
SendWebRequestAsync(
requestState.HttpMethod, requestState.Request,
requestState, requestState.WebRequest);
}
catch (Exception /*subEx*/)
{
HandleResponseError(ex, requestState);
}
return;
}
HandleResponseError(ex, requestState);
}
}