mcs/class/System.Web.Mvc2/System.Web.Mvc/HttpRequestExtensions.cs

   1 /* ****************************************************************************\r
   2  *\r
   3  * Copyright (c) Microsoft Corporation. All rights reserved.\r
   4  *\r
   5  * This software is subject to the Microsoft Public License (Ms-PL). \r
   6  * A copy of the license can be found in the license.htm file included \r
   7  * in this distribution.\r
   8  *\r
   9  * You must not remove this notice, or any other, from this software.\r
  10  *\r
  11  * ***************************************************************************/\r
  12 \r
  13 namespace System.Web.Mvc {\r
  14     using System;\r
  15 \r
  16     public static class HttpRequestExtensions {\r
  17         internal const string XHttpMethodOverrideKey = "X-HTTP-Method-Override";\r
  18 \r
  19         public static string GetHttpMethodOverride(this HttpRequestBase request) {\r
  20             if (request == null) {\r
  21                 throw new ArgumentNullException("request");\r
  22             }\r
  23 \r
  24             string incomingVerb = request.HttpMethod;\r
  25 \r
  26             if (!String.Equals(incomingVerb, "POST", StringComparison.OrdinalIgnoreCase)) {\r
  27                 return incomingVerb;\r
  28             }\r
  29 \r
  30             string verbOverride = null;\r
  31             string headerOverrideValue = request.Headers[XHttpMethodOverrideKey];\r
  32             if (!String.IsNullOrEmpty(headerOverrideValue)) {\r
  33                 verbOverride = headerOverrideValue;\r
  34             }\r
  35             else {\r
  36                 string formOverrideValue = request.Form[XHttpMethodOverrideKey];\r
  37                 if (!String.IsNullOrEmpty(formOverrideValue)) {\r
  38                     verbOverride = formOverrideValue;\r
  39                 }\r
  40                 else {\r
  41                     string queryStringOverrideValue = request.QueryString[XHttpMethodOverrideKey];\r
  42                     if (!String.IsNullOrEmpty(queryStringOverrideValue)) {\r
  43                         verbOverride = queryStringOverrideValue;\r
  44                     }\r
  45                 }\r
  46             }\r
  47             if (verbOverride != null) {\r
  48                 if (!String.Equals(verbOverride, "GET", StringComparison.OrdinalIgnoreCase) &&\r
  49                     !String.Equals(verbOverride, "POST", StringComparison.OrdinalIgnoreCase)) {\r
  50                     incomingVerb = verbOverride;\r
  51                 }\r
  52             }\r
  53             return incomingVerb;\r
  54         }\r
  55     }\r
  56 }\r