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//
// ScriptModule.cs
//
// Author:
// Igor Zelmanovich <igorz@mainsoft.com>
//
// (C) 2007 Mainsoft, Inc. http://www.mainsoft.com
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections.Generic;
using System.Text;
using System.Web.UI;
using System.Web.Script.Services;
namespace System.Web.Handlers
{
public class ScriptModule : IHttpModule
{
protected virtual void Init (HttpApplication context) {
context.PreSendRequestHeaders += new EventHandler (PreSendRequestHeaders);
context.PostAcquireRequestState += new EventHandler (PostAcquireRequestState);
context.AuthenticateRequest += new EventHandler (AuthenticateRequest);
}
void AuthenticateRequest (object sender, EventArgs e) {
// The AuthenticateRequest event is raised after the identity of the current user has been
// established. The handler for this event sets the SkipAuthorization property of the HttpContext
// for the current request. This property is checked in the authorization module to see
// if it has to omit authorization checking for the requested url. Usually an HttpModule
// use this property to allow anonymous access to some resources (for example,
// the Login Page if we’re using forms authentication). In our scenario,
// the ScriptModule sets the SkipAuthorization to true if the requested url is
// scriptresource.axd or if the authorization module is enabled and the request is a rest
// request to the authorization web service.
}
void PostAcquireRequestState (object sender, EventArgs e) {
// The PostAcquireRequestState event is raised after the session data has been obtained.
// If the request is for a class that implements System.Web.UI.Page and it is a rest
// method call, the WebServiceData class (that was explained in a previous post) is used
// to call the requested method from the Page. After the method has been called,
// the CompleteRequest method is called, bypassing all pipeline events and executing
// the EndRequest method. This allows MS AJAX to be able to call a method on a page
// instead of having to create a web service to call a method.
HttpApplication app = (HttpApplication) sender;
HttpContext context = app.Context;
if (context == null)
return;
HttpRequest request = context.Request;
string contentType = request.ContentType;
IHttpHandler currentHandler = context.CurrentHandler;
if (currentHandler == null)
return;
#if TARGET_J2EE
if (!(currentHandler is Page) && currentHandler is IServiceProvider) {
pageType = (Type) ((IServiceProvider) currentHandler).GetService (typeof (Type));
if (pageType == null)
return;
}
#endif
Type pageType = currentHandler.GetType ();
if (typeof (Page).IsAssignableFrom (pageType) && !String.IsNullOrEmpty (contentType) && contentType.StartsWith ("application/json", StringComparison.OrdinalIgnoreCase)) {
IHttpHandler h = RestHandler.GetHandler (context, pageType, request.FilePath);
h.ProcessRequest (context);
app.CompleteRequest ();
}
}
void PreSendRequestHeaders (object sender, EventArgs e)
{
HttpApplication app = (HttpApplication) sender;
HttpContext context = app.Context;
if (context.Request.Headers ["X-MicrosoftAjax"] == "Delta=true") {
Page p = context.CurrentHandler as Page;
#if TARGET_J2EE
if (p == null && context.CurrentHandler is IServiceProvider)
p = (Page) ((IServiceProvider) context.CurrentHandler).GetService (typeof (Page));
#endif
ScriptManager sm = ScriptManager.GetCurrentInternal (p);
if (context.Response.StatusCode == 302) {
context.Response.StatusCode = 200;
context.Response.ClearContent ();
if (context.Error == null || (sm != null && sm.AllowCustomErrorsRedirect))
ScriptManager.WriteCallbackRedirect (context.Response.Output, context.Response.RedirectLocation);
else
ScriptManager.WriteCallbackException (sm, context.Response.Output, context.Error, false);
} else if (context.Error != null) {
context.Response.StatusCode = 200;
context.Response.ClearContent ();
ScriptManager.WriteCallbackException (sm, context.Response.Output, context.Error, true);
}
}
}
protected virtual void Dispose () {
}
#region IHttpModule Members
void IHttpModule.Dispose () {
Dispose ();
}
void IHttpModule.Init (HttpApplication context) {
Init (context);
}
#endregion
}
}
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