bindurihelper.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Shared / MS / Utility / bindurihelper.cs / 1305600 / bindurihelper.cs
                        
                        
                            using System; 
using System.IO;
using System.Net; // HttpWebRequest
using System.Net.Cache; // HttpRequestCachePolicy
using System.ComponentModel; 
using System.Diagnostics;
using System.Globalization; 
using System.Text; 
using System.Windows.Navigation; // BaseUriHelper
 
#if !PBTCOMPILER
using MS.Win32;
#endif
 
using System.Security;
using System.Security.Permissions; 
// The functionality in this class is shared across framework and core. The functionality in core 
// is a subset of the functionality in framework, so rather than create a dependency from core to
// framework we have choses to duplicate this chunk of  code. 
#if PRESENTATION_CORE
namespace MS.Internal.PresentationCore
#elif PRESENTATIONFRAMEWORK
using MS.Internal.PresentationFramework; // SecurityHelper 

namespace MS.Internal.Utility 
#elif PBTCOMPILER 
using MS.Internal.PresentationBuildTasks // SecurityHelper
 
namespace MS.Internal.Utility
#elif REACHFRAMEWORK
using MS.Internal.ReachFramework; // SecurityHelper
 
namespace MS.Internal.Utility
#else 
#error Class is being used from an unknown assembly. 
#endif
{ 
   //
   // Methods in this partial class are shared by PresentationFramework and PresentationBuildTasks.
   // See also WpfWebRequestHelper.
   // 
   internal static  partial class BindUriHelper
   { 
        private const int MAX_PATH_LENGTH = 2048 ; 
        private const int MAX_SCHEME_LENGTH = 32;
        public const int MAX_URL_LENGTH = MAX_PATH_LENGTH + MAX_SCHEME_LENGTH + 3; /*=sizeof("://")*/ 

        //
        // Uri-toString does 3 things over the standard .toString()
        // 
        //  1) We don't unescape special control characters. The default Uri.ToString()
        //     will unescape a character like ctrl-g, or ctrl-h so the actual char is emitted. 
        //     However it's considered safer to emit the escaped version. 
        //
        //  2) We truncate urls so that they are always <= MAX_URL_LENGTH 
        //
        // This method should be called whenever you are taking a Uri
        // and performing a p-invoke on it.
        // 
        internal static string UriToString(Uri uri)
        { 
            if (uri == null) 
            {
                throw new ArgumentNullException("uri"); 
            }

            return new StringBuilder(
                uri.GetComponents( 
                    uri.IsAbsoluteUri ? UriComponents.AbsoluteUri : UriComponents.SerializationInfoString,
                    UriFormat.SafeUnescaped), 
                MAX_URL_LENGTH).ToString(); 
        }
 
#if PRESENTATION_CORE || PRESENTATIONFRAMEWORK
        // Base Uri.
        /// 
        /// Critical: as it sets the baseUri 
        /// 
        static internal Uri BaseUri 
        { 
            get
            { 
                return BaseUriHelper.BaseUri;
            }
            [SecurityCritical]
            set 
            {
                 BaseUriHelper.BaseUri = BaseUriHelper.FixFileUri(value); 
            } 
        }
 
        static internal bool DoSchemeAndHostMatch(Uri first, Uri second)
        {
            // Check that both the scheme and the host match.
           return (SecurityHelper.AreStringTypesEqual(first.Scheme, second.Scheme) && first.Host.Equals(second.Host) == true); 
        }
 
        static internal Uri GetResolvedUri(Uri baseUri, Uri orgUri) 
        {
            Uri newUri; 

            if (orgUri == null)
            {
                newUri = null; 
            }
            else if (orgUri.IsAbsoluteUri == false) 
            { 
                // if the orgUri is an absolute Uri, don't need to resolve it again.
 
                Uri baseuri = (baseUri == null) ? BindUriHelper.BaseUri : baseUri;

#if CF_Envelope_Activation_Enabled
                bool isContainer = false ; 

                // 
                // if the BaseUri starts with pack://application we know that we're not in a container. 
                //
                // By deferring the registration of the container scheme - we avoid registering the ssres protocol. 
                // and enable less code that requires elevation.
                //
                // Note that when container moves to pack: ( PS 25616) - we won't need this check anyway.
                // 

                if (  // Check that the baseuri starts with pack://application:,,,/ 
                       ! DoSchemeAndHostMatch(baseuri, BaseUriHelper.PackAppBaseUri)) 
                {
                    isContainer = String.Compare(baseuri.Scheme, CompoundFileUri.UriSchemeContainer, StringComparison.OrdinalIgnoreCase) == 0; 
                }

                Debug.Assert(baseuri.OriginalString == BaseUriHelper.FixFileUri(baseuri).OriginalString, "Base Uri is legacy file Uri and may not resolve relative uris correctly. This method should be updated");
 
                // ToDo ([....]): PS# 25616 Once we move to PackUri, we don't need a special way
                //  of resolving Uri. We can use the regurlar one. 
                if (isContainer) 
                {
                    newUri = ResolveContainerUri(baseuri, orgUri); 
                }
                else
                {
#endif 
                    newUri = new Uri(baseuri, orgUri);
#if CF_Envelope_Activation_Enabled 
                } 
#endif
            } 
            else
            {
                newUri = BaseUriHelper.FixFileUri(orgUri);
            } 

            return newUri; 
        } 

        ///  
        /// Gets the referer to set as a header on the HTTP request.
        /// We do not set the referer if we are navigating to a
        /// differnet security zone or to a different Uri scheme.
        ///  
        internal static string GetReferer(Uri destinationUri)
        { 
            string referer = null; 

            Uri sourceUri = MS.Internal.AppModel.SiteOfOriginContainer.BrowserSource; 
            if (sourceUri != null)
            {
                SecurityZone sourceZone = MS.Internal.AppModel.CustomCredentialPolicy.MapUrlToZone(sourceUri);
                SecurityZone targetZone = MS.Internal.AppModel.CustomCredentialPolicy.MapUrlToZone(destinationUri); 

                // We don't send any referer when crossing zone 
                if (sourceZone == targetZone) 
                {
                    // We don't send any referer when going cross-scheme 
                    if (SecurityHelper.AreStringTypesEqual(sourceUri.Scheme, destinationUri.Scheme))
                    {
                        // HTTPHeader requires the referer uri to be escaped.
                        referer = sourceUri.GetComponents(UriComponents.AbsoluteUri, UriFormat.UriEscaped); 
                    }
                } 
            } 

            return referer; 
        }


#endif // PRESENTATION_CORE || PRESENTATIONFRAMEWORK 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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bindurihelper.cs source code in C# .NET

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