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//
// RestHandler.cs
//
// Author:
// Konstantin Triger <kostat@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.Script.Serialization;
using System.Collections.Specialized;
using System.IO;
using System.Web.SessionState;
using System.Reflection;
namespace System.Web.Script.Services
{
sealed class RestHandler : IHttpHandler
{
#region SessionWrappers
class SessionWrapperHandler : IHttpHandler, IRequiresSessionState
{
readonly IHttpHandler _handler;
public SessionWrapperHandler (IHttpHandler handler) {
_handler = handler;
}
public bool IsReusable {
get { return _handler.IsReusable; }
}
public void ProcessRequest (HttpContext context) {
_handler.ProcessRequest (context);
}
}
sealed class ReadOnlySessionWrapperHandler : SessionWrapperHandler, IReadOnlySessionState
{
public ReadOnlySessionWrapperHandler (IHttpHandler handler) : base (handler) { }
}
#endregion
#region ExceptionSerializer
sealed class ExceptionSerializer
{
readonly Exception _e;
public ExceptionSerializer (Exception e) {
_e = e;
}
public string Message {
get { return _e.Message; }
}
public string StackTrace {
get { return _e.StackTrace; }
}
public string ExceptionType {
get { return _e.GetType ().FullName; }
}
}
#endregion
readonly LogicalTypeInfo.LogicalMethodInfo _logicalMethodInfo;
private RestHandler (HttpContext context, Type type, string filePath) {
LogicalTypeInfo logicalTypeInfo = LogicalTypeInfo.GetLogicalTypeInfo (type, filePath);
HttpRequest request = context.Request;
string methodName = request.PathInfo.Substring (1);
if (logicalTypeInfo == null || String.IsNullOrEmpty(methodName))
ThrowInvalidOperationException (methodName);
_logicalMethodInfo = logicalTypeInfo [methodName];
if (_logicalMethodInfo == null)
ThrowInvalidOperationException (methodName);
}
static void ThrowInvalidOperationException (string pathInfo) {
throw new InvalidOperationException (
string.Format ("Request format is unrecognized unexpectedly ending in '{0}'.", pathInfo));
}
static readonly Type IRequiresSessionStateType = typeof (IRequiresSessionState);
static readonly Type IReadOnlySessionStateType = typeof (IReadOnlySessionState);
public static IHttpHandler GetHandler (HttpContext context, Type type, string filePath) {
RestHandler handler = new RestHandler (context, type, filePath);
LogicalTypeInfo.LogicalMethodInfo mi = handler._logicalMethodInfo;
if (mi.MethodInfo.IsStatic) {
if (IRequiresSessionStateType.IsAssignableFrom (type))
return IReadOnlySessionStateType.IsAssignableFrom (type) ?
new ReadOnlySessionWrapperHandler (handler) : new SessionWrapperHandler (handler);
}
else
if (mi.EnableSession)
return new SessionWrapperHandler (handler);
return handler;
}
#region IHttpHandler Members
public bool IsReusable {
get { return false; }
}
public void ProcessRequest (HttpContext context) {
HttpRequest request = context.Request;
HttpResponse response = context.Response;
response.ContentType =
_logicalMethodInfo.ResponseFormat == ResponseFormat.Json ?
"application/json" : "text/xml";
response.Cache.SetCacheability (HttpCacheability.Private);
response.Cache.SetMaxAge (TimeSpan.Zero);
try {
_logicalMethodInfo.Invoke (request, response);
}
catch (TargetInvocationException e) {
response.AddHeader ("jsonerror", "true");
response.ContentType = "application/json";
response.StatusCode = 500;
JavaScriptSerializer.DefaultSerializer.Serialize (new ExceptionSerializer (e.GetBaseException ()), response.Output);
response.End ();
}
}
#endregion
}
}
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