125 lines
3.7 KiB
C#
125 lines
3.7 KiB
C#
//
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// Authors:
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// Marek Habersack <mhabersack@novell.com>
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//
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// Copyright (C) 2010 Novell, Inc (http://novell.com/)
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//
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Configuration;
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using System.Web;
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using System.Web.Configuration;
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namespace System.Web.Util
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{
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public class RequestValidator
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{
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static RequestValidator current;
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static Lazy <RequestValidator> lazyLoader;
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// The stack trace from .NET shows it uses Lazy <T>:
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//
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// Server stack trace:
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// at System.Web.Configuration.ConfigUtil.GetType(String typeName, String propertyName, ConfigurationElement configElement, XmlNode node, Boolean checkAptcaBit, Boolean ignoreCase)
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// at System.Web.Util.RequestValidator.GetCustomValidatorFromConfig()
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// at System.Lazy`1.CreateValue()
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//
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public static RequestValidator Current {
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get {
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if (current == null)
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current = lazyLoader.Value;
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return current;
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}
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set {
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if (value == null)
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throw new ArgumentNullException ("value");
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current = value;
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}
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}
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static RequestValidator ()
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{
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lazyLoader = new Lazy <RequestValidator> (new Func <RequestValidator> (LoadConfiguredValidator));
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}
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public RequestValidator ()
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{
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}
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protected internal virtual bool IsValidRequestString (HttpContext context, string value, RequestValidationSource requestValidationSource,
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string collectionKey, out int validationFailureIndex)
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{
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validationFailureIndex = 0;
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return !HttpRequest.IsInvalidString (value, out validationFailureIndex);
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}
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static void ParseTypeName (string spec, out string typeName, out string assemblyName)
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{
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try {
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if (String.IsNullOrEmpty (spec)) {
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typeName = null;
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assemblyName = null;
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return;
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}
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int comma = spec.IndexOf (',');
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if (comma == -1) {
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typeName = spec;
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assemblyName = null;
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return;
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}
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typeName = spec.Substring (0, comma).Trim ();
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assemblyName = spec.Substring (comma + 1).Trim ();
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} catch {
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typeName = spec;
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assemblyName = null;
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}
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}
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static RequestValidator LoadConfiguredValidator ()
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{
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HttpRuntimeSection runtimeConfig = HttpRuntime.Section;
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Type validatorType = null;
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string typeSpec = runtimeConfig.RequestValidationType;
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try {
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validatorType = HttpApplication.LoadType <RequestValidator> (typeSpec, true);
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} catch (TypeLoadException ex) {
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string typeName, assemblyName;
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ParseTypeName (typeSpec, out typeName, out assemblyName);
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throw new ConfigurationErrorsException (
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String.Format ("Could not load type '{0}' from assembly '{1}'.", typeName, assemblyName),
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ex);
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}
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return (RequestValidator) Activator.CreateInstance (validatorType);
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}
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}
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}
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