/// <summary>
/// Handles the error in the given response.
/// <para/>
/// This method is only called when HasError() method has returned <see langword="true"/>.
/// </summary>
/// <remarks>
/// This implementation throws appropriate exception if the response status code
/// is a client code error (4xx) or a server code error (5xx).
/// </remarks>
/// <param name="requestUri">The request URI.</param>
/// <param name="requestMethod">The request method.</param>
/// <param name="response">The response message with the error.</param>
public override void HandleError(Uri requestUri, HttpMethod requestMethod, HttpResponseMessage<byte[]> response)
{
if (response == null) throw new ArgumentNullException("response");
var type = (int)response.StatusCode / 100;
switch (type)
{
case 4:
HandleClientErrors(response);
break;
case 5:
HandleServerErrors(response.StatusCode);
break;
}
// if not otherwise handled, do default handling and wrap with StackExchangeApiException
try
{
base.HandleError(requestUri, requestMethod, response);
}
catch (Exception ex)
{
throw new StackExchangeApiException("Error consuming StackExchange REST API.", ex);
}
}
private void HandleClientErrors(HttpResponseMessage<byte[]> response)
{
JsonValue errorValue = this.ExtractErrorDetailsFromResponse(response);
if (errorValue == null)
{
return; // unexpected error body, can't be handled here
}
string errorText = errorValue.ContainsName("error")
? errorValue.GetValue<string>("error")
: response.StatusDescription;
switch (response.StatusCode)
{
case HttpStatusCode.BadRequest:
throw new DropboxApiException(errorText, DropboxApiError.BadParameter);
case HttpStatusCode.Unauthorized:
throw new DropboxApiException(errorText, DropboxApiError.NotAuthorized);
case HttpStatusCode.Forbidden:
throw new DropboxApiException(errorText, DropboxApiError.OperationNotPermitted);
case HttpStatusCode.NotFound:
throw new DropboxApiException(errorText, DropboxApiError.PathNotFound);
case HttpStatusCode.NotAcceptable:
throw new DropboxApiException(errorText, DropboxApiError.TooManyEntries);
case HttpStatusCode.LengthRequired:
throw new DropboxApiException(errorText, DropboxApiError.ChunkedEncodingNotSupported);
case HttpStatusCode.UnsupportedMediaType:
throw new DropboxApiException(errorText, DropboxApiError.ThumbnailNotSupported);
}
}
private static readonly Encoding DEFAULT_CHARSET = new UTF8Encoding(false); // Remove byte Order Mask (BOM)
/// <summary>
/// Handles the error in the given response.
/// <para/>
/// This method is only called when HasError() method has returned <see langword="true"/>.
/// </summary>
/// <remarks>
/// This implementation throws appropriate exception if the response status code
/// is a client code error (4xx) or a server code error (5xx).
/// </remarks>
/// <param name="requestUri">The request URI.</param>
/// <param name="requestMethod">The request method.</param>
/// <param name="response">The response message with the error.</param>
public override void HandleError(Uri requestUri, HttpMethod requestMethod, HttpResponseMessage<byte[]> response)
{
int type = (int)response.StatusCode / 100;
if (type == 4)
{
if (response.StatusCode == HttpStatusCode.NotFound)
{
string path = requestUri.AbsolutePath;
if (path.EndsWith("blocks/exists.json") ||
path.EndsWith("lists/members/show.json") ||
path.EndsWith("lists/subscribers/show.json"))
{
// Special cases: API binding will handle this
return;
}
}
this.HandleClientErrors(response);
}
else if (type == 5)
{
this.HandleServerErrors(response.StatusCode);
}
// if not otherwise handled, do default handling and wrap with TwitterApiException
try
{
base.HandleError(requestUri, requestMethod, response);
}
catch (Exception ex)
{
throw new TwitterApiException("Error consuming Twitter REST API.", ex);
}
}
/// <summary>
/// Handles the error in the given response.
/// <para/>
/// This method is only called when HasError() method has returned <see langword="true"/>.
/// </summary>
/// <remarks>
/// This implementation throws appropriate exception if the response status code
/// is a client code error (4xx) or a server code error (5xx).
/// </remarks>
/// <param name="requestUri">The request URI.</param>
/// <param name="requestMethod">The request method.</param>
/// <param name="response">The response message with the error.</param>
public override void HandleError(Uri requestUri, HttpMethod requestMethod, HttpResponseMessage<byte[]> response)
{
var data = System.Text.Encoding.UTF8.GetString(response.Body, 0, response.Body.Length);
if (response == null) throw new ArgumentNullException("response");
var type = (int)response.StatusCode / 100;
switch (type)
{
case 4:
HandleClientErrors(response.StatusCode);
break;
case 5:
HandleServerErrors(response.StatusCode);
break;
}
// if not otherwise handled, do default handling and wrap with ElanceApiException
try
{
base.HandleError(requestUri, requestMethod, response);
}
catch (Exception ex)
{
throw new ElanceApiException("Error consuming Elance REST API.", ex);
}
}
private void HandleClientErrors(HttpResponseMessage<byte[]> response)
{
if (response == null) throw new ArgumentNullException("response");
var errorText = ExtractErrorDetailsFromResponse(response);
throw new StackExchangeApiException(
"The server indicated a client error has occured and returned the following HTTP status code: " + response.StatusCode +
Environment.NewLine + Environment.NewLine +
errorText,
StackExchangeApiError.ClientError);
}
/// <summary>
/// Throws an exception if the response status code is a client code error (4xx)
/// or a server code error (5xx).
/// This method is only called when <see cref="M:HasError"/> has returned <see langword="true"/>.
/// </summary>
/// <param name="response">The response message with the error</param>
/// <exception cref="HttpClientErrorException">If the response status code is a client error (4xx).</exception>
/// <exception cref="HttpServerErrorException">If the response status code is a server error (4xx).</exception>
public virtual void HandleError(HttpResponseMessage<byte[]> response)
{
int type = (int)response.StatusCode / 100;
switch (type)
{
case 4:
throw new HttpClientErrorException(response);
case 5:
throw new HttpServerErrorException(response);
default:
throw new HttpResponseException(response);
}
}
private static readonly Encoding DEFAULT_CHARSET = new UTF8Encoding(false); // Remove byte Order Mask (BOM)
/// <summary>
/// Handles the error in the given response.
/// <para/>
/// This method is only called when HasError() method has returned <see langword="true"/>.
/// </summary>
/// <remarks>
/// This implementation throws appropriate exception if the response status code
/// is a client code error (4xx) or a server code error (5xx).
/// </remarks>
/// <param name="requestUri">The request URI.</param>
/// <param name="requestMethod">The request method.</param>
/// <param name="response">The response message with the error.</param>
public override void HandleError(Uri requestUri, HttpMethod requestMethod, HttpResponseMessage<byte[]> response)
{
int type = (int)response.StatusCode / 100;
if (type == 4)
{
this.HandleClientErrors(response);
}
else if (type == 5)
{
this.HandleServerErrors(response.StatusCode);
}
// if not otherwise handled, do default handling and wrap with DropboxApiException
try
{
base.HandleError(requestUri, requestMethod, response);
}
catch (Exception ex)
{
throw new DropboxApiException("Error consuming Dropbox REST API.", ex);
}
}
private JsonValue ExtractErrorDetailsFromResponse(HttpResponseMessage<byte[]> response)
{
if (response.Body == null)
{
return null;
}
MediaType contentType = response.Headers.ContentType;
Encoding charset = (contentType != null && contentType.CharSet != null) ? contentType.CharSet : DEFAULT_CHARSET;
string errorDetails = charset.GetString(response.Body, 0, response.Body.Length);
JsonValue result;
return JsonValue.TryParse(errorDetails, out result) ? result : null;
}
private string ExtractErrorDetailsFromResponse(HttpResponseMessage<byte[]> response)
{
if (response.Body == null)
{
return null;
}
var contentType = response.Headers.ContentType;
var charset = (contentType != null && contentType.CharSet != null) ? contentType.CharSet : DefaultCharset;
var stream = new MemoryStream(response.Body);
var gZipStream = new GZipStream(stream, CompressionMode.Decompress);
var responseUncompressed = new byte[response.Body.Length * 10];
var size = gZipStream.Read(responseUncompressed, 0, responseUncompressed.Length);
return charset.GetString(responseUncompressed, 0, size);
}
/// <summary>
/// Creates a new instance of <see cref="HttpServerErrorException"/>
/// based on an HTTP response message.
/// </summary>
/// <param name="requestUri">The HTTP request URI.</param>
/// <param name="requestMethod">The HTTP request method.</param>
/// <param name="response">The HTTP response message.</param>
public HttpServerErrorException(Uri requestUri, HttpMethod requestMethod, HttpResponseMessage<byte[]> response)
: base(requestUri, requestMethod, response)
{
}
/// <summary>
/// Creates a new instance of <see cref="HttpClientErrorException"/>
/// based on an HTTP response message.
/// </summary>
/// <param name="response">The HTTP response message.</param>
public HttpClientErrorException(HttpResponseMessage<byte[]> response)
: base (response)
{
}
private void HandleClientErrors(HttpResponseMessage<byte[]> response)
{
JsonValue errorValue = this.ExtractErrorDetailsFromResponse(response);
if (errorValue == null)
{
return; // unexpected error body, can't be handled here
}
string errorText = null;
if (errorValue.ContainsName("error"))
{
errorText = errorValue.GetValue<string>("error");
}
else if(errorValue.ContainsName("errors"))
{
JsonValue errorsValue = errorValue.GetValue("errors");
if (errorsValue.IsArray)
{
errorText = errorsValue.GetValue(0).GetValue<string>("message");
}
else if (errorsValue.IsString)
{
errorText = errorsValue.GetValue<string>();
}
}
if (response.StatusCode == HttpStatusCode.Unauthorized)
{
if (errorText == "Could not authenticate you.")
{
throw new TwitterApiException(
"Authorization is required for the operation, but the API binding was created without authorization.",
TwitterApiError.NotAuthorized);
}
else if (errorText == "Could not authenticate with OAuth.")
{
throw new TwitterApiException("The authorization has been revoked.", TwitterApiError.NotAuthorized);
}
else
{
throw new TwitterApiException(errorText ?? response.StatusDescription, TwitterApiError.NotAuthorized);
}
}
else if (response.StatusCode == HttpStatusCode.Forbidden)
{
throw new TwitterApiException(errorText, TwitterApiError.OperationNotPermitted);
}
else if (response.StatusCode == HttpStatusCode.NotFound)
{
throw new TwitterApiException(errorText, TwitterApiError.ResourceNotFound);
}
else if (response.StatusCode == (HttpStatusCode)420)
{
throw new TwitterApiException("The rate limit has been exceeded.", TwitterApiError.RateLimitExceeded);
}
}
/// <summary>
/// Creates a new instance of <see cref="HttpServerErrorException"/>
/// based on an HTTP response message.
/// </summary>
/// <param name="response">The HTTP response message.</param>
public HttpServerErrorException(HttpResponseMessage<byte[]> response)
: base(response)
{
}