RequestValidator.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / Util / RequestValidator.cs / 1305376 / RequestValidator.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 * Base class providing extensibility hooks for custom request validation 
 *
 * Copyright (c) 2009 Microsoft Corporation 
 */

namespace System.Web.Util {
    using System; 
    using System.Diagnostics.CodeAnalysis;
    using System.Threading; 
    using System.Web; 
    using System.Web.Configuration;
 
    public class RequestValidator {

        private static RequestValidator _customValidator;
 
        private static readonly Lazy _customValidatorResolver =
            new Lazy(GetCustomValidatorFromConfig); 
 
        public static RequestValidator Current {
            get { 
                if (_customValidator == null) {
                    _customValidator = _customValidatorResolver.Value;
                }
                return _customValidator; 
            }
            set { 
                if (value == null) { 
                    throw new ArgumentNullException("value");
                } 
                _customValidator = value;
            }
        }
 
        private static RequestValidator GetCustomValidatorFromConfig() {
            // App since this is static per AppDomain 
            RuntimeConfig config = RuntimeConfig.GetAppConfig(); 
            HttpRuntimeSection runtimeSection = config.HttpRuntime;
            string validatorTypeName = runtimeSection.RequestValidationType; 

            // validate the type
            Type validatorType = ConfigUtil.GetType(validatorTypeName, "requestValidationType", runtimeSection);
            ConfigUtil.CheckBaseType(typeof(RequestValidator) /* expectedBaseType */, validatorType, "requestValidationType", runtimeSection); 

            // instantiate 
            RequestValidator validator = (RequestValidator)HttpRuntime.CreatePublicInstance(validatorType); 
            return validator;
        } 

        internal static void InitializeOnFirstRequest() {
            // instantiate the validator if it hasn't already been created
            RequestValidator validator = _customValidatorResolver.Value; 
        }
 
        private static bool IsAtoZ(char c) { 
            return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
        } 

        [SuppressMessage("Microsoft.Design", "CA1021:AvoidOutParameters",
                 Justification = "This is an appropriate way to return multiple pieces of data.")]
        protected internal virtual bool IsValidRequestString(HttpContext context, string value, RequestValidationSource requestValidationSource, string collectionKey, out int validationFailureIndex) { 
            if (requestValidationSource == RequestValidationSource.Headers) {
                validationFailureIndex = 0; 
                return true; // Ignore Headers collection in the default implementation 
            }
            return !CrossSiteScriptingValidation.IsDangerousString(value, out validationFailureIndex); 
        }

    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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