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