Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / IO / Packaging / PackageStore.cs / 1 / PackageStore.cs
//------------------------------------------------------------------------------ // // Copyright (c) Microsoft Corporation, 2005 // // File: PackageStore.cs // // Description: Collection of packages to be used with PackWebRequest. // // History: // 07/25/2005: [....]: Created. //----------------------------------------------------------------------------- using System; using System.Collections; using System.Collections.Specialized; using System.IO; using System.IO.Packaging; using System.Security; using System.Security.Permissions; using System.Windows.Navigation; using MS.Internal.PresentationCore; // for ExceptionStringTable namespace System.IO.Packaging { // Note: we purposely didn't make this class a dictionary to limit the access // to the packages in the store // ////// PackageStore: Collection of packages to be used with PackWebRequest. /// PackWebRequest will use a package from PackageStore if package uri matches /// to obtain the requested part stream /// This mechanism can be used so that PackWebRequest wouldn't open a package /// multiple times to load different resources from the same package. /// ////// Note: Packages placed in PackageStore can be used in multi threading environment if it is used in /// conjunction with Xaml Parser (XmlReader.Load). It is up to an application to do proper locking on the package /// when it accesses the package directly. /// Note: The access to the packages obtained from PackageStore is not limited (or the access level is same /// as the one that is used to do open). It is up to an application to do proper action in modifying or closing /// packages. /// ////// Critical: This class serves as a deposity of packages to be re-used with PackWebRequest /// This affects where we load resources. This class is marked as SecurityCritical /// to ensure that: /// 1. No PT code can add/get/remove custom type of Package since the platform code (PackWebRequest) will /// execute the custom Package (untrusted code) /// 2. Allow PT code to add/get/remove only the well-known platform Package type (trusted code): ZipPackage /// TreatAsSafe: These are public methods. /// [SecurityCritical(SecurityCriticalScope.Everything)] public static class PackageStore { static PackageStore() { _globalLock = new Object(); } #region public Methods // ////// Retrieves a package from the store for the given Uri. /// /// key uri ///Package ////// /// ////// Demands EnvironmentPermission() if package is custom type of Package. /// This prevents Partially Trusted callers from performing this operation on custom type of Package. /// public static Package GetPackage(Uri uri) { ValidatePackageUri(uri); lock (_globalLock) { Package package = null; if (_packages != null && _packages.Contains(uri)) { package = (Package) _packages[uri]; DemandSecurityPermissionIfCustomPackage(package); } return package; } } ////// Adds a uri, package pair to the package store. /// /// key uri /// package ////// /// If a package with the uri is already in the store,it throws an exception. /// The package will not be automatically replaced within the store. /// ////// Demands EnvironmentPermission() if package is custom type of Package. /// This prevents Partially Trusted callers from performing this operation. However, Partially Trusted callers can still /// add well-known platform Package type (ZipPackage) to PackageStore. /// the application's PackageStore. /// public static void AddPackage(Uri uri, Package package) { // Allow well known platform Package to be added into PackageStore under Partial Trust. // Otherwise, demand Environment Permission to make sure only Full Trust app can add a custom Package DemandSecurityPermissionIfCustomPackage(package); ValidatePackageUri(uri); // There are well-known package types that are only for internal use (for resource loading) // (i.e. ResourceContainer - "application://" and SiteOriginContainer - "siteoforigin://" // Adding packages with such key uri will have no effect on PackWebRequest since // they cannot be overriden. So, calling this method with such key Uris should be prevented // However, uri.Equal cannot be used here since the key Uris are used as a pack Uri form and // only PackUriHelper.ComparePackUri can do the proper comparison of pack Uris. Uri packUri = PackUriHelper.Create(uri); if (PackUriHelper.ComparePackUri(packUri, BaseUriHelper.PackAppBaseUri) == 0 || PackUriHelper.ComparePackUri(packUri, BaseUriHelper.SiteOfOriginBaseUri) == 0) { throw new ArgumentException(SR.Get(SRID.NotAllowedPackageUri), "uri"); } if (package == null) { throw new ArgumentNullException("package"); } lock (_globalLock) { if (_packages == null) { _packages = new HybridDictionary(2); } if (_packages.Contains(uri)) { throw new InvalidOperationException(SR.Get(SRID.PackageAlreadyExists)); } _packages.Add(uri, package); } } ////// Removes a uri, package pair from the package store. /// /// key uri ////// /// ////// Demands EnvironmentPermission() if package is custom type of Package. /// This prevents Partially Trusted callers from performing this operation on custom type of Package. /// public static void RemovePackage(Uri uri) { ValidatePackageUri(uri); lock (_globalLock) { if (_packages != null) { DemandSecurityPermissionIfCustomPackage((Package) _packages[uri]); // If the key doesn't exist, it is no op _packages.Remove(uri); } } } #endregion Public Methods #region Private Methods private static void ValidatePackageUri(Uri uri) { if (uri == null) { throw new ArgumentNullException("uri"); } if (!uri.IsAbsoluteUri) { throw new ArgumentException(SR.Get(SRID.UriMustBeAbsolute), "uri"); } } private static void DemandSecurityPermissionIfCustomPackage(Package package) { // Although ZipPackage is sealed and cannot be subclassed, we shouldn't depend on // the "sealedness" of ZipPackage. Checking the object type is more reliable way // than using "as" or "is" operator. if (package != null && package.GetType() != typeof(ZipPackage)) { SecurityHelper.DemandEnvironmentPermission(); } } #endregion Private Methods #region Private Fields // We expect to have no more than 10 packages in the store // per AppDomain for our scenarios // ListDictionary is the best fit for this scenarios; otherwise we should be using // Hashtable. HybridDictionary already has functionality of switching between // ListDictionary and Hashtable depending on the size of the collection static private HybridDictionary _packages; static private Object _globalLock; #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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