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//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
#pragma warning disable 1634, 1691
namespace System.ServiceModel.Dispatcher
{
using System;
using System.Diagnostics;
using System.Net;
using System.Runtime;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Json;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.ServiceModel.Description;
using System.ServiceModel.Syndication;
using System.ServiceModel.Web;
using System.Xml.Linq;
using System.Xml.Serialization;
class WebErrorHandler : IErrorHandler
{
WebHttpBehavior webHttpBehavior;
ContractDescription contractDescription;
bool includeExceptionDetailInFaults;
public WebErrorHandler(WebHttpBehavior webHttpBehavior, ContractDescription contractDescription, bool includeExceptionDetailInFaults)
{
this.webHttpBehavior = webHttpBehavior;
this.contractDescription = contractDescription;
this.includeExceptionDetailInFaults = includeExceptionDetailInFaults;
}
public bool HandleError(Exception error)
{
return false;
}
public void ProvideFault(Exception error, MessageVersion version, ref Message fault)
{
if (version != MessageVersion.None || error == null)
{
return;
}
// If the exception is not derived from FaultException and the fault message is already present
// then only another error handler could have provided the fault so we should not replace it
FaultException errorAsFaultException = error as FaultException;
if (errorAsFaultException == null && fault != null)
{
return;
}
try
{
if (error is IWebFaultException)
{
IWebFaultException webFaultException = (IWebFaultException)error;
WebOperationContext context = WebOperationContext.Current;
context.OutgoingResponse.StatusCode = webFaultException.StatusCode;
string operationName;
if (OperationContext.Current.IncomingMessageProperties.TryGetValue<string>(WebHttpDispatchOperationSelector.HttpOperationNamePropertyName, out operationName))
{
OperationDescription description = this.contractDescription.Operations.Find(operationName);
bool isXmlSerializerFaultFormat = WebHttpBehavior.IsXmlSerializerFaultFormat(description);
if (isXmlSerializerFaultFormat && WebOperationContext.Current.OutgoingResponse.Format == WebMessageFormat.Json)
{
throw System.ServiceModel.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR2.GetString(SR2.JsonFormatRequiresDataContract, description.Name, description.DeclaringContract.Name, description.DeclaringContract.Namespace)));
}
WebMessageFormat? nullableFormat = !isXmlSerializerFaultFormat ? context.OutgoingResponse.Format : WebMessageFormat.Xml;
WebMessageFormat format = nullableFormat.HasValue ? nullableFormat.Value : this.webHttpBehavior.GetResponseFormat(description);
if (webFaultException.DetailObject != null)
{
switch (format)
{
case WebMessageFormat.Json:
fault = context.CreateJsonResponse(webFaultException.DetailObject, new DataContractJsonSerializer(webFaultException.DetailType, webFaultException.KnownTypes));
break;
case WebMessageFormat.Xml:
if (isXmlSerializerFaultFormat)
{
fault = context.CreateXmlResponse(webFaultException.DetailObject, new XmlSerializer(webFaultException.DetailType, webFaultException.KnownTypes));
}
else
{
fault = context.CreateXmlResponse(webFaultException.DetailObject, new DataContractSerializer(webFaultException.DetailType, webFaultException.KnownTypes));
}
break;
}
}
else
{
HttpResponseMessageProperty property;
if (OperationContext.Current.OutgoingMessageProperties.TryGetValue<HttpResponseMessageProperty>(HttpResponseMessageProperty.Name, out property) &&
property != null)
{
property.SuppressEntityBody = true;
}
if (format == WebMessageFormat.Json)
{
fault.Properties.Add(WebBodyFormatMessageProperty.Name, WebBodyFormatMessageProperty.JsonProperty);
}
}
}
else
{
throw System.ServiceModel.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR2.OperationNameNotFound));
}
}
else
{
fault = CreateHtmlResponse(error);
}
}
catch (Exception ex)
{
if (Fx.IsFatal(ex))
{
throw;
}
if (System.ServiceModel.DiagnosticUtility.ShouldTraceWarning)
{
System.ServiceModel.DiagnosticUtility.TraceHandledException(new InvalidOperationException(SR2.GetString(SR2.HelpPageFailedToCreateErrorMessage)), TraceEventType.Warning);
}
WebOperationContext.Current.OutgoingResponse.StatusCode = HttpStatusCode.BadRequest;
fault = CreateHtmlResponse(ex);
}
}
Message CreateHtmlResponse(Exception error)
{
// Note: WebOperationContext may not be present in case of an invalid HTTP request
Uri helpUri = null;
if (WebOperationContext.Current != null)
{
helpUri = this.webHttpBehavior.HelpUri != null ? UriTemplate.RewriteUri(this.webHttpBehavior.HelpUri, WebOperationContext.Current.IncomingRequest.Headers[HttpRequestHeader.Host]) : null;
}
StreamBodyWriter bodyWriter;
if (this.includeExceptionDetailInFaults)
{
bodyWriter = StreamBodyWriter.CreateStreamBodyWriter(s => HelpHtmlBuilder.CreateServerErrorPage(helpUri, error).Save(s, SaveOptions.OmitDuplicateNamespaces));
}
else
{
bodyWriter = StreamBodyWriter.CreateStreamBodyWriter(s => HelpHtmlBuilder.CreateServerErrorPage(helpUri, null).Save(s, SaveOptions.OmitDuplicateNamespaces));
}
Message response = new HttpStreamMessage(bodyWriter);
response.Properties.Add(WebBodyFormatMessageProperty.Name, WebBodyFormatMessageProperty.RawProperty);
HttpResponseMessageProperty responseProperty = GetResponseProperty(WebOperationContext.Current, response);
if (!responseProperty.HasStatusCodeBeenSet)
{
responseProperty.StatusCode = HttpStatusCode.BadRequest;
}
responseProperty.Headers[HttpResponseHeader.ContentType] = Atom10Constants.HtmlMediaType;
return response;
}
static HttpResponseMessageProperty GetResponseProperty(WebOperationContext currentContext, Message response)
{
HttpResponseMessageProperty responseProperty;
if (currentContext != null)
{
responseProperty = currentContext.OutgoingResponse.MessageProperty;
}
else
{
responseProperty = new HttpResponseMessageProperty();
response.Properties.Add(HttpResponseMessageProperty.Name, responseProperty);
}
return responseProperty;
}
}
}
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