/// <summary>
/// Get the request stream
/// </summary>
/// <param name="request">The request</param>
/// <returns>The Request stream</returns>
private Task <Stream> GetWebRequestStream(IEwsHttpWebRequest request)
{
// In the async case, although we can use async callback to make the entire worflow completely async,
// there is little perf gain with this approach because of EWS's message nature.
// The overall latency of BeginGetRequestStream() is same as GetRequestStream() in this case.
// The overhead to implement a two-step async operation includes wait handle synchronization, exception handling and wrapping.
// Therefore, we only leverage BeginGetResponse() and EndGetResponse() to provide the async functionality.
// Reference: http://www.wintellect.com/CS/blogs/jeffreyr/archive/2009/02/08/httpwebrequest-its-request-stream-and-sending-data-in-chunks.aspx
return(request.GetRequestStream());
}
/// <summary>
/// Executes this instance.
/// </summary>
/// <returns></returns>
internal AutodiscoverResponse InternalExecute()
{
this.Validate();
try
{
IEwsHttpWebRequest request = this.Service.PrepareHttpWebRequestForUrl(this.Url);
this.Service.TraceHttpRequestHeaders(TraceFlags.AutodiscoverRequestHttpHeaders, request);
bool needSignature = this.Service.Credentials != null && this.Service.Credentials.NeedSignature;
bool needTrace = this.Service.IsTraceEnabledFor(TraceFlags.AutodiscoverRequest);
using (Stream requestStream = request.GetRequestStream())
{
using (MemoryStream memoryStream = new MemoryStream())
{
using (EwsServiceXmlWriter writer = new EwsServiceXmlWriter(this.Service, memoryStream))
{
writer.RequireWSSecurityUtilityNamespace = needSignature;
this.WriteSoapRequest(
this.Url,
writer);
}
if (needSignature)
{
this.service.Credentials.Sign(memoryStream);
}
if (needTrace)
{
memoryStream.Position = 0;
this.Service.TraceXml(TraceFlags.AutodiscoverRequest, memoryStream);
}
EwsUtilities.CopyStream(memoryStream, requestStream);
}
}
using (IEwsHttpWebResponse webResponse = request.GetResponse())
{
if (AutodiscoverRequest.IsRedirectionResponse(webResponse))
{
AutodiscoverResponse response = this.CreateRedirectionResponse(webResponse);
if (response != null)
{
return(response);
}
else
{
throw new ServiceRemoteException(Strings.InvalidRedirectionResponseReturned);
}
}
using (Stream responseStream = AutodiscoverRequest.GetResponseStream(webResponse))
{
using (MemoryStream memoryStream = new MemoryStream())
{
// Copy response stream to in-memory stream and reset to start
EwsUtilities.CopyStream(responseStream, memoryStream);
memoryStream.Position = 0;
this.Service.TraceResponse(webResponse, memoryStream);
EwsXmlReader ewsXmlReader = new EwsXmlReader(memoryStream);
// WCF may not generate an XML declaration.
ewsXmlReader.Read();
if (ewsXmlReader.NodeType == XmlNodeType.XmlDeclaration)
{
ewsXmlReader.ReadStartElement(XmlNamespace.Soap, XmlElementNames.SOAPEnvelopeElementName);
}
else if ((ewsXmlReader.NodeType != XmlNodeType.Element) || (ewsXmlReader.LocalName != XmlElementNames.SOAPEnvelopeElementName) || (ewsXmlReader.NamespaceUri != EwsUtilities.GetNamespaceUri(XmlNamespace.Soap)))
{
throw new ServiceXmlDeserializationException(Strings.InvalidAutodiscoverServiceResponse);
}
this.ReadSoapHeaders(ewsXmlReader);
AutodiscoverResponse response = this.ReadSoapBody(ewsXmlReader);
ewsXmlReader.ReadEndElement(XmlNamespace.Soap, XmlElementNames.SOAPEnvelopeElementName);
if (response.ErrorCode == AutodiscoverErrorCode.NoError)
{
return(response);
}
else
{
throw new AutodiscoverResponseException(response.ErrorCode, response.ErrorMessage);
}
}
}
}
}
catch (WebException ex)
{
if (ex.Status == WebExceptionStatus.ProtocolError && ex.Response != null)
{
IEwsHttpWebResponse httpWebResponse = this.Service.HttpWebRequestFactory.CreateExceptionResponse(ex);
if (AutodiscoverRequest.IsRedirectionResponse(httpWebResponse))
{
this.Service.ProcessHttpResponseHeaders(
TraceFlags.AutodiscoverResponseHttpHeaders,
httpWebResponse);
AutodiscoverResponse response = this.CreateRedirectionResponse(httpWebResponse);
if (response != null)
{
return(response);
}
}
else
{
this.ProcessWebException(ex);
}
}
// Wrap exception if the above code block didn't throw
throw new ServiceRequestException(string.Format(Strings.ServiceRequestFailed, ex.Message), ex);
}
catch (XmlException ex)
{
this.Service.TraceMessage(
TraceFlags.AutodiscoverConfiguration,
string.Format("XML parsing error: {0}", ex.Message));
// Wrap exception
throw new ServiceRequestException(string.Format(Strings.ServiceRequestFailed, ex.Message), ex);
}
catch (IOException ex)
{
this.Service.TraceMessage(
TraceFlags.AutodiscoverConfiguration,
string.Format("I/O error: {0}", ex.Message));
// Wrap exception
throw new ServiceRequestException(string.Format(Strings.ServiceRequestFailed, ex.Message), ex);
}
}
