mcs/class/System.Web/System.Web.Configuration/HttpHandlersSectionHandler.cs

   1 //
   2 // System.Web.Configuration.HttpHandlersSectionHandler
   3 //
   4 // Authors:
   5 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   6 //
   7 // (C) 2002 Ximian, Inc (http://www.ximian.com)
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System.Collections;
  32 using System.Configuration;
  33 using System.Xml;
  34 using System.Globalization;
  35
  36 namespace System.Web.Configuration
  37 {
  38         class HttpHandlersSectionHandler : IConfigurationSectionHandler
  39         {
  40                 public virtual object Create (object parent, object configContext, XmlNode section)
  41                 {
  42                         HandlerFactoryConfiguration mapper;
  43
  44                         if (parent is HandlerFactoryConfiguration)
  45                                 mapper = new HandlerFactoryConfiguration ((HandlerFactoryConfiguration) parent);
  46                         else
  47                                 mapper = new HandlerFactoryConfiguration (null);
  48
  49                         if (section.Attributes != null && section.Attributes.Count != 0)
  50                                 HandlersUtil.ThrowException ("Unrecognized attribute", section);
  51
  52                         XmlNodeList httpHandlers = section.ChildNodes;
  53                         foreach (XmlNode child in httpHandlers) {
  54                                 XmlNodeType ntype = child.NodeType;
  55                                 if (ntype == XmlNodeType.Whitespace || ntype == XmlNodeType.Comment)
  56                                         continue;
  57
  58                                 if (ntype != XmlNodeType.Element)
  59                                         HandlersUtil.ThrowException ("Only elements allowed", child);
  60
  61                                 string name = child.Name;
  62                                 if (name == "clear") {
  63                                         if (child.Attributes != null && child.Attributes.Count != 0)
  64                                                 HandlersUtil.ThrowException ("Unrecognized attribute", child);
  65
  66                                         mapper.Clear ();
  67                                         continue;
  68                                 }
  69
  70                                 string verb = HandlersUtil.ExtractAttributeValue ("verb", child);
  71                                 string path = HandlersUtil.ExtractAttributeValue ("path", child);
  72                                 string validateStr = HandlersUtil.ExtractAttributeValue ("validate", child, true);
  73                                 bool validate;
  74                                 if (validateStr == null) {
  75                                         validate = true;
  76                                 } else {
  77 #if NET_2_0
  78                                         validate = "true" == validateStr.ToLower (CultureInfo.InvariantCulture);
  79                                         if (!validate && "false" != validateStr.ToLower (CultureInfo.InvariantCulture))
  80 #else
  81                                         validate = validateStr == "true";
  82                                         if (!validate && validateStr != "false")
  83 #endif
  84                                                 HandlersUtil.ThrowException (
  85                                                                 "Invalid value for validate attribute.", child);
  86                                 }
  87
  88                                 if (name == "add") {
  89                                         string type = HandlersUtil.ExtractAttributeValue ("type", child);
  90                                         if (child.Attributes != null && child.Attributes.Count != 0)
  91                                                 HandlersUtil.ThrowException ("Unrecognized attribute", child);
  92
  93                                         mapper.Add (verb, path, type, validate);
  94                                         continue;
  95                                 }
  96
  97                                 if (name == "remove") {
  98                                         if (child.Attributes != null && child.Attributes.Count != 0)
  99                                                 HandlersUtil.ThrowException ("Unrecognized attribute", child);
 100
 101                                         if (validate && false == mapper.Remove (verb, path))
 102                                                 HandlersUtil.ThrowException ("There's no mapping to remove", child);
 103
 104                                         continue;
 105                                 }
 106                                 HandlersUtil.ThrowException ("Unexpected element", child);
 107                         }
 108
 109                         return mapper;
 110                 }
 111         }
 112
 113         internal class HandlersUtil
 114         {
 115                 private HandlersUtil ()
 116                 {
 117                 }
 118
 119                 static internal string ExtractAttributeValue (string attKey, XmlNode node)
 120                 {
 121                         return ExtractAttributeValue (attKey, node, false);
 122                 }
 123
 124                 static internal string ExtractAttributeValue (string attKey, XmlNode node, bool optional)
 125                 {
 126                         return ExtractAttributeValue (attKey, node, optional, false);
 127                 }
 128
 129                 static internal string ExtractAttributeValue (string attKey, XmlNode node, bool optional,
 130                                                               bool allowEmpty)
 131                 {
 132                         if (node.Attributes == null) {
 133                                 if (optional)
 134                                         return null;
 135
 136                                 ThrowException ("Required attribute not found: " + attKey, node);
 137                         }
 138
 139                         XmlNode att = node.Attributes.RemoveNamedItem (attKey);
 140                         if (att == null) {
 141                                 if (optional)
 142                                         return null;
 143                                 ThrowException ("Required attribute not found: " + attKey, node);
 144                         }
 145
 146                         string value = att.Value;
 147                         if (!allowEmpty && value == String.Empty) {
 148                                 string opt = optional ? "Optional" : "Required";
 149                                 ThrowException (opt + " attribute is empty: " + attKey, node);
 150                         }
 151
 152                         return value;
 153                 }
 154
 155                 static internal void ThrowException (string msg, XmlNode node)
 156                 {
 157                         if (node != null && node.Name != String.Empty)
 158                                 msg = msg + " (node name: " + node.Name + ") ";
 159                         throw new ConfigurationException (msg, node);
 160                 }
 161         }
 162 }
 163