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//------------------------------------------------------------------------------
// <copyright file="ErrorHandlerModule.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
using System;
using System.IO;
using System.Web;
using System.Diagnostics;
using System.Collections;
using System.Text;
using System.Security.Permissions;
using System.Globalization;
namespace System.Web.Mobile
{
/*
* Error Handler Module
* An Http Module that traps errors, and formats them for the appropriate
* device.
*
* Copyright (c) 2000 Microsoft Corporation
*/
/// <include file='doc\ErrorHandlerModule.uex' path='docs/doc[@for="ErrorHandlerModule"]/*' />
[AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)]
[Obsolete("The System.Web.Mobile.dll assembly has been deprecated and should no longer be used. For information about how to develop ASP.NET mobile applications, see http://go.microsoft.com/fwlink/?LinkId=157231.")]
public class ErrorHandlerModule : IHttpModule
{
/// <include file='doc\ErrorHandlerModule.uex' path='docs/doc[@for="ErrorHandlerModule.IHttpModule.Init"]/*' />
/// <internalonly/>
void IHttpModule.Init(HttpApplication application)
{
// application.BeginRequest += (new EventHandler(this.Application_BeginRequest));
application.Error += (new EventHandler(this.Application_Error));
// application.EndRequest += (new EventHandler(this.Application_EndRequest));
}
/* obsolete
private void Application_BeginRequest(Object source, EventArgs e)
{
HttpApplication application = (HttpApplication)source;
HttpContext context = application.Context;
if (context != null)
{
// Some device/gateway combination sends postdata's charset
// in a separate header rather than in Content-Type.
SetCharsetInRequestHeader(context);
}
}
private void SetCharsetInRequestHeader(HttpContext context)
{
String userAgent = context.Request.UserAgent;
if (userAgent != null && CultureInfo.InvariantCulture.CompareInfo.IsPrefix(userAgent, "UP"))
{
String postDataCharset = context.Request.Headers["x-up-devcap-post-charset"];
if (postDataCharset != null && postDataCharset.Length > 0)
{
try
{
context.Request.ContentEncoding = Encoding.GetEncoding(postDataCharset);
}
catch
{
// Exception may be thrown when charset is not valid.
// In this case, do nothing, and let the framework
// use the configured RequestEncoding setting.
}
}
}
}
*/
/* Obsolete
private void Application_EndRequest(Object source, EventArgs e)
{
HttpApplication application = (HttpApplication)source;
HttpContext context = application.Context;
if (context != null)
{
MobileRedirect.CheckForInvalidRedirection(context);
}
}
*/
private void Application_Error(Object source, EventArgs e)
{
HttpApplication application = (HttpApplication)source;
HttpContext context = null;
bool useAdaptiveErrorReporting = false;
try
{
context = application.Context;
if(context.IsCustomErrorEnabled)
{
return;
}
Exception error = context.Server.GetLastError();
if ((error == null) || (!RequiresAdaptiveErrorReporting(context, error)))
{
return;
}
useAdaptiveErrorReporting = true;
MobileErrorInfo errorInfo = new MobileErrorInfo(error);
context.Items[MobileErrorInfo.ContextKey] = errorInfo;
context.Response.Clear();
IHttpHandler errorHandler = CreateErrorFormatter(context);
errorHandler.ProcessRequest(context);
}
catch(Exception e2)
{
if (useAdaptiveErrorReporting && context != null)
{
// Failed to format error. Let it continue through
// default processing.
context.Response.Write(e2.ToString());
context.Server.ClearError();
return;
}
else
{
return;
}
}
context.Server.ClearError();
}
/// <include file='doc\ErrorHandlerModule.uex' path='docs/doc[@for="ErrorHandlerModule.IHttpModule.Dispose"]/*' />
/// <internalonly/>
void IHttpModule.Dispose()
{
}
private bool RequiresAdaptiveErrorReporting(HttpContext context, Exception error)
{
// Check if the error message is a non-500 error.
HttpException httpError = error as HttpException;
if (httpError != null && httpError.GetHttpCode() != 500)
{
return false;
}
bool b;
// Checks whether custom error formatting is required for the
// given device.
MobileCapabilities caps = context.Request.Browser as MobileCapabilities;
if (caps == null)
{
b = false;
}
else if (caps.PreferredRenderingMime != "text/html")
{
b = true;
}
else
{
b = caps.RequiresHtmlAdaptiveErrorReporting;
}
return b;
}
private IHttpHandler CreateErrorFormatter(HttpContext context)
{
//
return new System.Web.UI.MobileControls.ErrorFormatterPage();
}
}
}
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