mcs/class/System.Web.DynamicData/System.Web.DynamicData/DynamicDataRouteHandler.cs

   1 //
   2 // DynamicDataRouteHandler.cs
   3 //
   4 // Authors:
   5 //      Atsushi Enomoto <atsushi@ximian.com>
   6 //      Marek Habersack <mhabersack@novell.com>
   7 //
   8 // Copyright (C) 2008-2009 Novell Inc. http://novell.com
   9 //
  10
  11 //
  12 // Permission is hereby granted, free of charge, to any person obtaining
  13 // a copy of this software and associated documentation files (the
  14 // "Software"), to deal in the Software without restriction, including
  15 // without limitation the rights to use, copy, modify, merge, publish,
  16 // distribute, sublicense, and/or sell copies of the Software, and to
  17 // permit persons to whom the Software is furnished to do so, subject to
  18 // the following conditions:
  19 //
  20 // The above copyright notice and this permission notice shall be
  21 // included in all copies or substantial portions of the Software.
  22 //
  23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  27 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  28 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  29 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  30 //
  31 using System;
  32 using System.Collections;
  33 using System.Collections.Generic;
  34 using System.Collections.Specialized;
  35 using System.Data.Linq.Mapping;
  36 using System.Globalization;
  37 using System.Security.Permissions;
  38 using System.Security.Principal;
  39 using System.Threading;
  40 using System.Web.Caching;
  41 using System.Web.Compilation;
  42 using System.Web.Routing;
  43 using System.Web.UI;
  44
  45 namespace System.Web.DynamicData
  46 {
  47         [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  48         [AspNetHostingPermission (SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  49         public class DynamicDataRouteHandler : IRouteHandler
  50         {
  51                 static ReaderWriterLockSlim contextsLock = new ReaderWriterLockSlim ();
  52
  53                 static Dictionary <HttpContext, RouteContext> contexts = new Dictionary <HttpContext, RouteContext> ();
  54                 Dictionary <RouteContext, IHttpHandler> handlers;
  55
  56                 Dictionary <RouteContext, IHttpHandler> Handlers {
  57                         get {
  58                                 if (handlers == null)
  59                                         handlers = new Dictionary <RouteContext, IHttpHandler> ();
  60
  61                                 return handlers;
  62                         }
  63                 }
  64
  65                 public static RequestContext GetRequestContext (HttpContext httpContext)
  66                 {
  67                         if (httpContext == null)
  68                                 throw new ArgumentNullException ("httpContext");
  69
  70                         RouteContext rc;
  71                         bool locked = false;
  72                         try {
  73                                 contextsLock.EnterReadLock ();
  74                                 locked = true;
  75                                 if (contexts.TryGetValue (httpContext, out rc) && rc != null)
  76                                         return rc.Context;
  77                         } finally {
  78                                 if (locked)
  79                                         contextsLock.ExitReadLock ();
  80                         }
  81
  82                         var ctxWrapper = new HttpContextWrapper (httpContext);
  83                         RouteData rd = RouteTable.Routes.GetRouteData (ctxWrapper);
  84                         if (rd == null)
  85                                 rd = new RouteData ();
  86
  87                         var ret = new RequestContext (ctxWrapper, rd);
  88
  89                         locked = false;
  90                         try {
  91                                 contextsLock.EnterWriteLock ();
  92                                 locked = true;
  93                                 contexts.Add (httpContext, MakeRouteContext (ret, null, null, null));
  94                         } finally {
  95                                 if (locked)
  96                                         contextsLock.ExitWriteLock ();
  97                         }
  98
  99                         return ret;
 100                 }
 101
 102                 public static MetaTable GetRequestMetaTable (HttpContext httpContext)
 103                 {
 104                         if (httpContext == null)
 105                                 throw new ArgumentNullException ("httpContext");
 106
 107                         RouteContext rc;
 108                         bool locked = false;
 109                         try {
 110                                 contextsLock.EnterReadLock ();
 111                                 locked = true;
 112                                 if (contexts.TryGetValue (httpContext, out rc) && rc != null)
 113                                         return rc.Table;
 114                         } finally {
 115                                 if (locked)
 116                                         contextsLock.ExitReadLock ();
 117                         }
 118
 119                         return null;
 120                 }
 121
 122                 [MonoTODO]
 123                 public static void SetRequestMetaTable (HttpContext httpContext, MetaTable table)
 124                 {
 125                         throw new NotImplementedException ();
 126                 }
 127
 128                 public DynamicDataRouteHandler ()
 129                 {
 130                 }
 131
 132                 public MetaModel Model { get; internal set; }
 133
 134                 [MonoTODO]
 135                 public virtual IHttpHandler CreateHandler (DynamicDataRoute route, MetaTable table, string action)
 136                 {
 137                         var vp = String.Concat (String.Concat (HttpContext.Current.Request.ApplicationPath, "DynamicData/PageTemplates/", action, ".aspx"));
 138                         return (IHttpHandler) BuildManager.CreateInstanceFromVirtualPath (vp, typeof (Page));
 139                 }
 140
 141                 [MonoTODO]
 142                 protected virtual string GetCustomPageVirtualPath (MetaTable table, string viewName)
 143                 {
 144                         throw new NotImplementedException ();
 145                 }
 146
 147                 [MonoTODO]
 148                 protected virtual string GetScaffoldPageVirtualPath (MetaTable table, string viewName)
 149                 {
 150                         throw new NotImplementedException ();
 151                 }
 152
 153                 IHttpHandler IRouteHandler.GetHttpHandler (RequestContext requestContext)
 154                 {
 155                         if (requestContext == null)
 156                                 throw new ArgumentNullException ("requestContext");
 157                         RouteData rd = requestContext.RouteData;
 158                         var dr = rd.Route as DynamicDataRoute;
 159                         if (dr == null)
 160                                 throw new ArgumentException ("The argument RequestContext does not have DynamicDataRoute in its RouteData");
 161                         string action = dr.GetActionFromRouteData (rd);
 162                         MetaTable mt = dr.GetTableFromRouteData (rd);
 163                         RouteContext rc = MakeRouteContext (requestContext, dr, action, mt);
 164                         IHttpHandler h;
 165
 166                         Dictionary <RouteContext, IHttpHandler> handlers = Handlers;
 167                         if (handlers.TryGetValue (rc, out h))
 168                                 return h;
 169                         h = CreateHandler (dr, mt, action);
 170                         handlers.Add (rc, h);
 171                         return h;
 172                 }
 173
 174                 static RouteContext MakeRouteContext (RequestContext context, DynamicDataRoute route, string action, MetaTable table)
 175                 {
 176                         RouteData rd = null;
 177
 178                         if (route == null) {
 179                                 rd = context.RouteData;
 180                                 route = rd.Route as DynamicDataRoute;
 181                         }
 182
 183                         if (route != null) {
 184                                 if (action == null) {
 185                                         if (rd == null)
 186                                                 rd = context.RouteData;
 187                                         action = route.GetActionFromRouteData (rd);
 188                                 }
 189
 190                                 if (table == null) {
 191                                         if (rd == null)
 192                                                 rd = context.RouteData;
 193
 194                                         table = route.GetTableFromRouteData (rd);
 195                                 }
 196                         }
 197
 198                         return new RouteContext () {
 199                                 Route = route,
 200                                 Action = action,
 201                                 Table = table,
 202                                 Context = context};
 203                 }
 204
 205                 sealed class RouteContext
 206                 {
 207                         public DynamicDataRoute Route;
 208                         public string Action;
 209                         public MetaTable Table;
 210                         public RequestContext Context;
 211
 212                         public RouteContext ()
 213                         {
 214                         }
 215
 216                         public override bool Equals (object obj)
 217                         {
 218                                 RouteContext other = obj as RouteContext;
 219                                 return other.Route == Route & other.Action == Action && other.Table == Table && other.Context == Context;
 220                         }
 221
 222                         public override int GetHashCode ()
 223                         {
 224                                 return (Route != null ? Route.GetHashCode () << 27 : 0) +
 225                                         (Action != null ? Action.GetHashCode () << 19 : 0) +
 226                                         (Table != null ? Table.GetHashCode () << 9 : 0) +
 227                                         (Context != null ? Context.GetHashCode () : 0);
 228                         }
 229                 }
 230         }
 231 }