Fixing concurrency issues in preset retrieval.

- Also enhanced security.


Former-commit-id: d977f2eb89343065cf95418bc2d43dd5e32ccbbc

src/ImageProcessor.Web/NET45/Config/ImageProcessorConfig.cs

@@ -12,6 +12,7 @@ namespace ImageProcessor.Web.Config
 {
     #region Using
     using System;
+    using System.Collections.Concurrent;
     using System.Collections.Generic;
     using System.Linq;
     using System.Reflection;
@@ -37,14 +38,14 @@ namespace ImageProcessor.Web.Config
         /// A collection of the <see cref="T:ImageProcessor.Web.Config.ImageProcessingSection.SettingElementCollection"/> elements 
         /// for available plugins.
         /// </summary>
-        private static readonly Dictionary<string, Dictionary<string, string>> PluginSettings =
-            new Dictionary<string, Dictionary<string, string>>();
+        private static readonly ConcurrentDictionary<string, Dictionary<string, string>> PluginSettings =
+            new ConcurrentDictionary<string, Dictionary<string, string>>();
 
         /// <summary>
         /// A collection of the processing presets defined in the configuration. 
         /// for available plugins.
         /// </summary>
-        private static readonly Dictionary<string, string> PresetSettings = new Dictionary<string, string>();
+        private static readonly ConcurrentDictionary<string, string> PresetSettings = new ConcurrentDictionary<string, string>();
 
         /// <summary>
         /// The processing configuration section from the current application configuration. 
@@ -185,33 +186,26 @@ namespace ImageProcessor.Web.Config
 
         #region Methods
         /// <summary>
-        /// Returns the collection of the processing presets defined in the configuration.
+        /// Returns the processing instructions matching the preset defined in the configuration.
         /// </summary>
         /// <param name="name">
         /// The name of the plugin to get the settings for.
         /// </param>
         /// <returns>
-        /// The <see cref="T:Systems.Collections.Generic.Dictionary{string, string}"/> containing the processing presets defined in the configuration.
+        /// The <see cref="T:Systems.String"/> the processing instructions.
         /// </returns>
         public string GetPresetSettings(string name)
         {
-            if (!PresetSettings.ContainsKey(name))
-            {
-                var presetElement =
-                    GetImageProcessingSection().Presets
-                    .Cast<ImageProcessingSection.PresetElement>()
-                    .FirstOrDefault(x => x.Name == name);
-
-                if (presetElement != null)
-                {
-                    PresetSettings[presetElement.Name] = presetElement.Value;
-                }
-            }
-
-            string preset;
-            PresetSettings.TryGetValue(name, out preset);
-
-            return preset;
+            return PresetSettings.GetOrAdd(
+                   name,
+                   n =>
+                   {
+                       ImageProcessingSection.PresetElement presetElement = GetImageProcessingSection()
+                       .Presets
+                       .Cast<ImageProcessingSection.PresetElement>()
+                       .FirstOrDefault(x => x.Name == n);
+                       return presetElement != null ? presetElement.Value : null;
+                   });
         }
 
         /// <summary>
@@ -225,31 +219,30 @@ namespace ImageProcessor.Web.Config
         /// </returns>
         public Dictionary<string, string> GetPluginSettings(string name)
         {
-            if (!PluginSettings.ContainsKey(name))
-            {
-                var pluginElement =
-                    GetImageProcessingSection().Plugins
-                    .Cast<ImageProcessingSection.PluginElement>()
-                    .FirstOrDefault(x => x.Name == name);
-
-                Dictionary<string, string> settings;
-
-                if (pluginElement != null)
+            return PluginSettings.GetOrAdd(
+                name,
+                n =>
                 {
-                    settings = pluginElement.Settings
-                        .Cast<ImageProcessingSection.SettingElement>()
-                        .ToDictionary(setting => setting.Key, setting => setting.Value);
-                }
-                else
-                {
-                    settings = new Dictionary<string, string>();
-                }
+                    ImageProcessingSection.PluginElement pluginElement = GetImageProcessingSection()
+                        .Plugins
+                        .Cast<ImageProcessingSection.PluginElement>()
+                        .FirstOrDefault(x => x.Name == n);
 
-                PluginSettings.Add(name, settings);
-                return settings;
-            }
+                    Dictionary<string, string> settings;
+
+                    if (pluginElement != null)
+                    {
+                        settings = pluginElement.Settings
+                            .Cast<ImageProcessingSection.SettingElement>()
+                            .ToDictionary(setting => setting.Key, setting => setting.Value);
+                    }
+                    else
+                    {
+                        settings = new Dictionary<string, string>();
+                    }
 
-            return PluginSettings[name];
+                    return settings;
+                });
         }
 
         /// <summary>

src/ImageProcessor.Web/NET45/Helpers/RemoteFile.cs

@@ -15,7 +15,6 @@ namespace ImageProcessor.Web.Helpers
     using System.Collections.Generic;
     using System.Globalization;
     using System.IO;
-    using System.Linq;
     using System.Net;
     using System.Security;
     using System.Text;
@@ -354,8 +353,24 @@ namespace ImageProcessor.Web.Helpers
             string upper = this.url.Host.ToUpperInvariant();
 
             // Check for root or subdomain.
-            bool validUrl = RemoteFileWhiteList.Any(item =>
-                upper.StartsWith(item.Host.ToUpperInvariant()) || upper.EndsWith(item.Host.ToUpperInvariant()));
+            bool validUrl = false;
+            foreach (Uri uri in RemoteFileWhiteList)
+            {
+                if (!uri.IsAbsoluteUri)
+                {
+                    Uri rebaseUri = new Uri("http://" + uri.ToString().TrimStart(new[] { '.', '/' }));
+                    validUrl = upper.StartsWith(rebaseUri.Host.ToUpperInvariant()) || upper.EndsWith(rebaseUri.Host.ToUpperInvariant());
+                }
+                else
+                {
+                    validUrl = upper.StartsWith(uri.Host.ToUpperInvariant()) || upper.EndsWith(uri.Host.ToUpperInvariant());
+                }
+
+                if (validUrl)
+                {
+                    break;
+                }
+            }
 
             if (!validUrl)
             {

src/ImageProcessor.Web/NET45/HttpModules/ImageProcessingModule.cs

@@ -261,7 +261,6 @@ namespace ImageProcessor.Web.HttpModules
             bool isRemote = request.Path.EndsWith(remotePrefix, StringComparison.OrdinalIgnoreCase);
             string requestPath = string.Empty;
             string queryString = string.Empty;
-
             bool validExtensionLessUrl = false;
             string urlParameters = "";
             string extensionLessExtension = "";
@@ -346,14 +345,12 @@ namespace ImageProcessor.Web.HttpModules
                 // in the UrlAuthorizationModule by creating a generic identity.
                 string virtualCachedPath = cache.GetVirtualCachedPath();
 
-                IPrincipal user = context.User
-                                  ?? new GenericPrincipal(new GenericIdentity(string.Empty, string.Empty), new string[0]);
+                IPrincipal user = context.User ?? new GenericPrincipal(new GenericIdentity(string.Empty, string.Empty), new string[0]);
 
                 // Do we have permission to call UrlAuthorizationModule.CheckUrlAccessForPrincipal?
                 PermissionSet permission = new PermissionSet(PermissionState.None);
                 permission.AddPermission(new AspNetHostingPermission(AspNetHostingPermissionLevel.Unrestricted));
                 bool hasPermission = permission.IsSubsetOf(AppDomain.CurrentDomain.PermissionSet);
-
                 bool isAllowed = true;
 
                 // Run the rewritten path past the auth system again, using the result as the default "AllowAccess" value
@@ -493,6 +490,11 @@ namespace ImageProcessor.Web.HttpModules
                     throw new HttpException(403, "Access denied");
                 }
             }
+            else if (isRemote)
+            {
+                // Just repoint to the external url.
+                HttpContext.Current.Response.Redirect(requestPath);
+            }
         }
 
         /// <summary>

src/TestWebsites/NET45/Test_Website_NET45/Views/Home/External.cshtml

@@ -11,4 +11,9 @@
             <img src="/remote.axd?http://maps.googleapis.com/maps/api/staticmap?center=Albany,+NY&zoom=13&scale=false&size=800x500&maptype=roadmap&sensor=false&format=png&visual_refresh=true?width=400" />
         </div>
     </div>
+    <div class="row">
+        <div class="col-s-6">
+            <img src="/remote.axd?http://images.hanselminutes.com/images/255.jpg?width=200" />
+        </div>
+    </div>
 </section>

src/TestWebsites/NET45/Test_Website_NET45/Views/Home/Index.cshtml

@@ -11,6 +11,8 @@
                 <h3>Foreign language test.</h3>
                 <img src="/images/udendørs.jpg?width=300" />
                 <img src="/images/udendørs.jpg?preset=demo&filter=comic" />
+                <h3>Strange name</h3>
+                <img src="/images/falahill_design__160p.jpg?preset=demo" />
             </div>
             <div class="col-s-6">
                 <h2>Cropped </h2>
@@ -201,18 +203,6 @@
 </article>
 <article>
     <h1>Color Profiles</h1>
-    @*    <section>
-            <div class="row">
-                <div class="col-s-6">
-                    <h2>CMYK original jpg</h2>
-                    <img src="/images/cmyk.jpg?" width="400" />
-                </div>
-                <div class="col-s-6">
-                    <h2>sRGB original jpg</h2>
-                    <img src="/images/srgb.jpg?" width="400" />
-                </div>
-            </div>
-        </section>*@
     <section>
         <div class="row">
             <div class="col-s-6">
@@ -233,4 +223,4 @@
             <img src="/Images/header_1.jpg?width=750&crop=0-48-750-220" />
         </div>
     </section>
-</article>
+</article>

src/TestWebsites/NET45/Test_Website_NET45/config/imageprocessor/security.config

@@ -1,14 +1,15 @@
 <?xml version="1.0" encoding="utf-8" ?>
-  <security allowRemoteDownloads="true" timeout="300000" maxBytes="524288" remotePrefix="/remote.axd">
-    <whiteList>
-      <add url="http://images.mymovies.net"/>
-      <add url="http://maps.googleapis.com" extensionLess="true" imageFormat=".png"/>
-      <add url="https://fbcdn-profile-"/>
-      <add url="http://fbcdn-profile-"/>
-      <add url="https://profile."/>
-      <add url="http://profile."/>
-      <add url="https://pbs.twimg.com"/>
-      <add url="http://pbs.twimg.com"/>
-      <add url="http://placekitten.com"/>
-    </whiteList>
-  </security>
+<security allowRemoteDownloads="true" timeout="300000" maxBytes="524288" remotePrefix="/remote.axd">
+  <whiteList>
+    <add url="http://images.mymovies.net"/>
+    <add url="http://maps.googleapis.com" extensionLess="true" imageFormat=".png"/>
+    <add url="https://fbcdn-profile-"/>
+    <add url="http://fbcdn-profile-"/>
+    <add url="https://profile."/>
+    <add url="http://profile."/>
+    <add url="https://pbs.twimg.com"/>
+    <add url="http://pbs.twimg.com"/>
+    <add url="http://placekitten.com"/>
+    <add url="http://hanselminutes.com/"/>
+  </whiteList>
+</security>