Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / MS / Internal / WpfWebRequestHelper.cs / 1458001 / WpfWebRequestHelper.cs
//+------------------------------------------------------------------------ // // Copyright (c) Microsoft Corporation. All rights reserved. // // Description: // Helper class for handling all web requests/responses in the framework. Using it ensures consisent // handling and support for special features: cookies, NTLM authentication, caching, inferring MIME // type from filename. // // History: // 2007/04/11 [....] Created // //----------------------------------------------------------------------- using System; using System.Net; using System.Net.Cache; using System.Security; using System.Security.Permissions; using System.IO; using System.Windows.Navigation; using System.IO.Packaging; using MS.Internal.AppModel; using MS.Internal.Utility; using MS.Internal.PresentationCore; //From Presharp documentation: //In order to avoid generating warnings about unknown message numbers and //unknown pragmas when compiling your C# source code with the actual C# compiler, //you need to disable warnings 1634 and 1691. #pragma warning disable 1634, 1691 namespace MS.Internal { ////// Helper class for handling all web requests/responses in the framework. Using it ensures consisent handling /// and support for special features: cookies, NTLM authentication, caching, inferring MIME type from filename. /// /// Only two methods are mandatory: /// - CreateRequest. (PackWebRequestFactory.CreateWebRequest is an allowed alternative. It delegates to /// this CreateRequest for non-pack URIs.) /// - HandleWebResponse. /// The remaining methods just automate the entire request process, up to the point of getting the response /// stream. Using the SecurityTreatAsSafe ones helps avoid making other code SecurityCritical. /// /// Related types: /// - BaseUriHelper /// - BindUriHelper (built into Framework, subset into Core) /// - PackWebRequestFactory /// - MimeObjectFactory /// static class WpfWebRequestHelper { ////// Critical: Elevates to set WebRequest.UseDefaultCredentials. /// Safe: Activates the CustomCredentialPolicy, which makes sure the user's system credentials are not /// sent across the Internet. /// [SecurityCritical, SecurityTreatAsSafe] [FriendAccessAllowed] internal static WebRequest CreateRequest(Uri uri) { // Ideally we would want to use RegisterPrefix and WebRequest.Create. // However, these two functions regress 700k working set in System.dll and System.xml.dll // which is mostly for logging and config. // Call PackWebRequestFactory.CreateWebRequest to bypass the regression if possible // by calling Create on PackWebRequest if uri is pack scheme if (string.Compare(uri.Scheme, PackUriHelper.UriSchemePack, StringComparison.Ordinal) == 0) { return PackWebRequestFactory.CreateWebRequest(uri); // The PackWebRequest may end up creating a "real" web request as its inner request. // It will then call this method again. } // Work around the issue with FileWebRequest not handling #. Details in bug 1096304. // FileWebRequest doesn't support the concept of query and fragment. if (uri.IsFile) { uri = new Uri(uri.GetLeftPart(UriPartial.Path)); } WebRequest request = WebRequest.Create(uri); // It is not clear whether WebRequest.Create() can ever return null, but v1 code make this check in // a couple of places, so it is still done here, just in case. if(request == null) { // Unfortunately, there is no appropriate exception string in PresentationCore, and for v3.5 // we have a total resource freeze. So just report WebExceptionStatus.RequestCanceled: // "The request was canceled, the WebRequest.Abort method was called, or an unclassifiable error // occurred. This is the default value for Status." Uri requestUri = BaseUriHelper.PackAppBaseUri.MakeRelativeUri(uri); throw new WebException(requestUri.ToString(), WebExceptionStatus.RequestCanceled); //throw new IOException(SR.Get(SRID.GetResponseFailed, requestUri.ToString())); } HttpWebRequest httpRequest = request as HttpWebRequest; if (httpRequest != null) { if (string.IsNullOrEmpty(httpRequest.UserAgent)) { httpRequest.UserAgent = DefaultUserAgent; } CookieHandler.HandleWebRequest(httpRequest); if (String.IsNullOrEmpty(httpRequest.Referer)) { httpRequest.Referer = BindUriHelper.GetReferer(uri); } CustomCredentialPolicy.EnsureCustomCredentialPolicy(); // Enable NTLM authentication. // This is safe to do thanks to the CustomCredentialPolicy. (new EnvironmentPermission(EnvironmentPermissionAccess.Read, "USERNAME")).Assert(); // BlessedAssert try { httpRequest.UseDefaultCredentials = true; } finally { EnvironmentPermission.RevertAssert(); } } return request; } ///****** /// This method was factored out of the defunct BindUriHelper.ConfigHttpWebRequest(). /// Ideally, all framework-created web requests should use the same caching settings, but in order not to /// change behavior in SP1/v3.5, ConfigCachePolicy() is called separately by the code that previously /// relied on ConfigHttpWebRequest(). /// [FriendAccessAllowed] static internal void ConfigCachePolicy(WebRequest request, bool isRefresh) { HttpWebRequest httpRequest = request as HttpWebRequest; if (httpRequest != null) { // Setting CachePolicy to the default level if it is null. if (request.CachePolicy == null || request.CachePolicy.Level != RequestCacheLevel.Default) { if (isRefresh) { if (_httpRequestCachePolicyRefresh == null) { _httpRequestCachePolicyRefresh = new HttpRequestCachePolicy(HttpRequestCacheLevel.Refresh); } request.CachePolicy = _httpRequestCachePolicyRefresh; } else { if (_httpRequestCachePolicy == null) { _httpRequestCachePolicy = new HttpRequestCachePolicy(); } request.CachePolicy = _httpRequestCachePolicy; } } } } private static HttpRequestCachePolicy _httpRequestCachePolicy; private static HttpRequestCachePolicy _httpRequestCachePolicyRefresh; ////// Critical (getter): Calls the native ObtainUserAgentString(). /// Safe: User-agent string is safe to expose. An XBAP could get it by asking the server what the browser /// sent it initially. /// internal static string DefaultUserAgent { [SecurityCritical, SecurityTreatAsSafe] get { if (_defaultUserAgent == null) { _defaultUserAgent = MS.Win32.UnsafeNativeMethods.ObtainUserAgentString(); } return _defaultUserAgent; } set // set by ApplicationProxyInternal for browser hosting { _defaultUserAgent = value; } } private static string _defaultUserAgent; ////// Critical: Calls the critical CookieHandler.HandleWebResponse(). /// We need a secure path for passing authentic, unaltered HttpWebRespones. /// CAUTION: Presently, callers of this method are not required to make any security guarantee about /// non-HTTP web responses. They will all need to be revised if secure handling of other types of /// requests/responses becomes necessary. /// [SecurityCritical] [FriendAccessAllowed] internal static void HandleWebResponse(WebResponse response) { CookieHandler.HandleWebResponse(response); } [FriendAccessAllowed] internal static Stream CreateRequestAndGetResponseStream(Uri uri) { WebRequest request = CreateRequest(uri); return GetResponseStream(request); } [FriendAccessAllowed] internal static Stream CreateRequestAndGetResponseStream(Uri uri, out ContentType contentType) { WebRequest request = CreateRequest(uri); return GetResponseStream(request, out contentType); } [FriendAccessAllowed] internal static WebResponse CreateRequestAndGetResponse(Uri uri) { WebRequest request = CreateRequest(uri); return GetResponse(request); } ////// Critical: Calls the critical HandleWebResponse(), which expects unaltered, authentic HttpWebResponses. /// Safe: The response is obtained right here and is passed directly to HandleWebResponse(). /// Even if the given request object is bogus, it cannot produce an HttpWebResponse, because the class /// has no public or protected constructor. However, a bogus request could attach to itself an /// HttpWebResponse from a real request and alter it. This possibility is prevented by a type check. /// A critical assumption is that HttpWebRequest cannot be derived from and therefore its behavior /// cannot be altered (beyond what its public APIs allow, but the security-sensitive ones demand /// appropriate permission). /// [SecurityCritical, SecurityTreatAsSafe] [FriendAccessAllowed] internal static WebResponse GetResponse(WebRequest request) { WebResponse response = request.GetResponse(); // 'is' is used here instead of exact type checks to allow for the (remote) possibility that an internal // implementation type derived from HttpWebRequest/Response may be used by System.Net. if (response is HttpWebResponse && !(request is HttpWebRequest)) throw new ArgumentException(); // It is not clear whether WebRequest.GetRespone() can ever return null, but some of the v1 code had // this check, so it is added here just in case. if (response == null) { Uri requestUri = BaseUriHelper.PackAppBaseUri.MakeRelativeUri(request.RequestUri); throw new IOException(SR.Get(SRID.GetResponseFailed, requestUri.ToString())); } HandleWebResponse(response); return response; } ////// [See GetResponse()] /// [SecurityCritical, SecurityTreatAsSafe] [FriendAccessAllowed] internal static WebResponse EndGetResponse(WebRequest request, IAsyncResult ar) { WebResponse response = request.EndGetResponse(ar); if (response is HttpWebResponse && !(request is HttpWebRequest)) throw new ArgumentException(); // It is not clear whether WebRequest.GetRespone() can ever return null, but some of the v1 code had // this check, so it is added here just in case. if (response == null) { Uri requestUri = BaseUriHelper.PackAppBaseUri.MakeRelativeUri(request.RequestUri); throw new IOException(SR.Get(SRID.GetResponseFailed, requestUri.ToString())); } HandleWebResponse(response); return response; } [FriendAccessAllowed] internal static Stream GetResponseStream(WebRequest request) { WebResponse response = GetResponse(request); return response.GetResponseStream(); } ////// Gets the response from the given request and determines the content type using the special rules /// implemented in GetContentType(). /// [FriendAccessAllowed] internal static Stream GetResponseStream(WebRequest request, out ContentType contentType) { WebResponse response = GetResponse(request); contentType = GetContentType(response); return response.GetResponseStream(); } // [Apr'07. Code moved here from BaseUriHelper.GetContentType().] ////// Tries hard to obtain the content type of the given WebResponse. Special cases: /// - The ContentType property may throw if not implemented. /// - Unconfigured web servers don't return the right type for WPF content. This method does lookup based on /// file extension. /// [FriendAccessAllowed] internal static ContentType GetContentType(WebResponse response) { ContentType contentType = ContentType.Empty; // FileWebResponse returns a generic mime type for all files regardless of extension. // We have requested fix but it's postponed to orcas. This is a work around for that. // if (!(response is FileWebResponse)) { // For all other cases use the WebResponse's ContentType if it is available try { contentType = new ContentType(response.ContentType); // If our content type is octet-stream or text/plain, we might be dealing with an unconfigured server. // If the extension is .xaml or .xbap we ignore the server's content type and determine // the content type based on the URI's extension. if (MimeTypeMapper.OctetMime.AreTypeAndSubTypeEqual(contentType, true) || MimeTypeMapper.TextPlainMime.AreTypeAndSubTypeEqual(contentType, true)) { string extension = MimeTypeMapper.GetFileExtension(response.ResponseUri); if ((String.Compare(extension, MimeTypeMapper.XamlExtension, StringComparison.OrdinalIgnoreCase) == 0) || (String.Compare(extension, MimeTypeMapper.XbapExtension, StringComparison.OrdinalIgnoreCase) == 0)) { contentType = ContentType.Empty; // Will cause GetMimeTypeFromUri to be called below } } } #pragma warning disable 6502 catch (NotImplementedException) { // this is a valid result and indicates that the subclass chose not to implement this property } catch (NotSupportedException) { // this is a valid result and indicates that the subclass chose not to implement this property } #pragma warning restore 6502 } if (contentType == ContentType.Empty) { contentType = MimeTypeMapper.GetMimeTypeFromUri(response.ResponseUri); } return contentType; } }; } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //+------------------------------------------------------------------------ // // Copyright (c) Microsoft Corporation. All rights reserved. // // Description: // Helper class for handling all web requests/responses in the framework. Using it ensures consisent // handling and support for special features: cookies, NTLM authentication, caching, inferring MIME // type from filename. // // History: // 2007/04/11 [....] Created // //----------------------------------------------------------------------- using System; using System.Net; using System.Net.Cache; using System.Security; using System.Security.Permissions; using System.IO; using System.Windows.Navigation; using System.IO.Packaging; using MS.Internal.AppModel; using MS.Internal.Utility; using MS.Internal.PresentationCore; //From Presharp documentation: //In order to avoid generating warnings about unknown message numbers and //unknown pragmas when compiling your C# source code with the actual C# compiler, //you need to disable warnings 1634 and 1691. #pragma warning disable 1634, 1691 namespace MS.Internal { ////// Helper class for handling all web requests/responses in the framework. Using it ensures consisent handling /// and support for special features: cookies, NTLM authentication, caching, inferring MIME type from filename. /// /// Only two methods are mandatory: /// - CreateRequest. (PackWebRequestFactory.CreateWebRequest is an allowed alternative. It delegates to /// this CreateRequest for non-pack URIs.) /// - HandleWebResponse. /// The remaining methods just automate the entire request process, up to the point of getting the response /// stream. Using the SecurityTreatAsSafe ones helps avoid making other code SecurityCritical. /// /// Related types: /// - BaseUriHelper /// - BindUriHelper (built into Framework, subset into Core) /// - PackWebRequestFactory /// - MimeObjectFactory /// static class WpfWebRequestHelper { ////// Critical: Elevates to set WebRequest.UseDefaultCredentials. /// Safe: Activates the CustomCredentialPolicy, which makes sure the user's system credentials are not /// sent across the Internet. /// [SecurityCritical, SecurityTreatAsSafe] [FriendAccessAllowed] internal static WebRequest CreateRequest(Uri uri) { // Ideally we would want to use RegisterPrefix and WebRequest.Create. // However, these two functions regress 700k working set in System.dll and System.xml.dll // which is mostly for logging and config. // Call PackWebRequestFactory.CreateWebRequest to bypass the regression if possible // by calling Create on PackWebRequest if uri is pack scheme if (string.Compare(uri.Scheme, PackUriHelper.UriSchemePack, StringComparison.Ordinal) == 0) { return PackWebRequestFactory.CreateWebRequest(uri); // The PackWebRequest may end up creating a "real" web request as its inner request. // It will then call this method again. } // Work around the issue with FileWebRequest not handling #. Details in bug 1096304. // FileWebRequest doesn't support the concept of query and fragment. if (uri.IsFile) { uri = new Uri(uri.GetLeftPart(UriPartial.Path)); } WebRequest request = WebRequest.Create(uri); // It is not clear whether WebRequest.Create() can ever return null, but v1 code make this check in // a couple of places, so it is still done here, just in case. if(request == null) { // Unfortunately, there is no appropriate exception string in PresentationCore, and for v3.5 // we have a total resource freeze. So just report WebExceptionStatus.RequestCanceled: // "The request was canceled, the WebRequest.Abort method was called, or an unclassifiable error // occurred. This is the default value for Status." Uri requestUri = BaseUriHelper.PackAppBaseUri.MakeRelativeUri(uri); throw new WebException(requestUri.ToString(), WebExceptionStatus.RequestCanceled); //throw new IOException(SR.Get(SRID.GetResponseFailed, requestUri.ToString())); } HttpWebRequest httpRequest = request as HttpWebRequest; if (httpRequest != null) { if (string.IsNullOrEmpty(httpRequest.UserAgent)) { httpRequest.UserAgent = DefaultUserAgent; } CookieHandler.HandleWebRequest(httpRequest); if (String.IsNullOrEmpty(httpRequest.Referer)) { httpRequest.Referer = BindUriHelper.GetReferer(uri); } CustomCredentialPolicy.EnsureCustomCredentialPolicy(); // Enable NTLM authentication. // This is safe to do thanks to the CustomCredentialPolicy. (new EnvironmentPermission(EnvironmentPermissionAccess.Read, "USERNAME")).Assert(); // BlessedAssert try { httpRequest.UseDefaultCredentials = true; } finally { EnvironmentPermission.RevertAssert(); } } return request; } ///****** /// This method was factored out of the defunct BindUriHelper.ConfigHttpWebRequest(). /// Ideally, all framework-created web requests should use the same caching settings, but in order not to /// change behavior in SP1/v3.5, ConfigCachePolicy() is called separately by the code that previously /// relied on ConfigHttpWebRequest(). /// [FriendAccessAllowed] static internal void ConfigCachePolicy(WebRequest request, bool isRefresh) { HttpWebRequest httpRequest = request as HttpWebRequest; if (httpRequest != null) { // Setting CachePolicy to the default level if it is null. if (request.CachePolicy == null || request.CachePolicy.Level != RequestCacheLevel.Default) { if (isRefresh) { if (_httpRequestCachePolicyRefresh == null) { _httpRequestCachePolicyRefresh = new HttpRequestCachePolicy(HttpRequestCacheLevel.Refresh); } request.CachePolicy = _httpRequestCachePolicyRefresh; } else { if (_httpRequestCachePolicy == null) { _httpRequestCachePolicy = new HttpRequestCachePolicy(); } request.CachePolicy = _httpRequestCachePolicy; } } } } private static HttpRequestCachePolicy _httpRequestCachePolicy; private static HttpRequestCachePolicy _httpRequestCachePolicyRefresh; ////// Critical (getter): Calls the native ObtainUserAgentString(). /// Safe: User-agent string is safe to expose. An XBAP could get it by asking the server what the browser /// sent it initially. /// internal static string DefaultUserAgent { [SecurityCritical, SecurityTreatAsSafe] get { if (_defaultUserAgent == null) { _defaultUserAgent = MS.Win32.UnsafeNativeMethods.ObtainUserAgentString(); } return _defaultUserAgent; } set // set by ApplicationProxyInternal for browser hosting { _defaultUserAgent = value; } } private static string _defaultUserAgent; ////// Critical: Calls the critical CookieHandler.HandleWebResponse(). /// We need a secure path for passing authentic, unaltered HttpWebRespones. /// CAUTION: Presently, callers of this method are not required to make any security guarantee about /// non-HTTP web responses. They will all need to be revised if secure handling of other types of /// requests/responses becomes necessary. /// [SecurityCritical] [FriendAccessAllowed] internal static void HandleWebResponse(WebResponse response) { CookieHandler.HandleWebResponse(response); } [FriendAccessAllowed] internal static Stream CreateRequestAndGetResponseStream(Uri uri) { WebRequest request = CreateRequest(uri); return GetResponseStream(request); } [FriendAccessAllowed] internal static Stream CreateRequestAndGetResponseStream(Uri uri, out ContentType contentType) { WebRequest request = CreateRequest(uri); return GetResponseStream(request, out contentType); } [FriendAccessAllowed] internal static WebResponse CreateRequestAndGetResponse(Uri uri) { WebRequest request = CreateRequest(uri); return GetResponse(request); } ////// Critical: Calls the critical HandleWebResponse(), which expects unaltered, authentic HttpWebResponses. /// Safe: The response is obtained right here and is passed directly to HandleWebResponse(). /// Even if the given request object is bogus, it cannot produce an HttpWebResponse, because the class /// has no public or protected constructor. However, a bogus request could attach to itself an /// HttpWebResponse from a real request and alter it. This possibility is prevented by a type check. /// A critical assumption is that HttpWebRequest cannot be derived from and therefore its behavior /// cannot be altered (beyond what its public APIs allow, but the security-sensitive ones demand /// appropriate permission). /// [SecurityCritical, SecurityTreatAsSafe] [FriendAccessAllowed] internal static WebResponse GetResponse(WebRequest request) { WebResponse response = request.GetResponse(); // 'is' is used here instead of exact type checks to allow for the (remote) possibility that an internal // implementation type derived from HttpWebRequest/Response may be used by System.Net. if (response is HttpWebResponse && !(request is HttpWebRequest)) throw new ArgumentException(); // It is not clear whether WebRequest.GetRespone() can ever return null, but some of the v1 code had // this check, so it is added here just in case. if (response == null) { Uri requestUri = BaseUriHelper.PackAppBaseUri.MakeRelativeUri(request.RequestUri); throw new IOException(SR.Get(SRID.GetResponseFailed, requestUri.ToString())); } HandleWebResponse(response); return response; } ////// [See GetResponse()] /// [SecurityCritical, SecurityTreatAsSafe] [FriendAccessAllowed] internal static WebResponse EndGetResponse(WebRequest request, IAsyncResult ar) { WebResponse response = request.EndGetResponse(ar); if (response is HttpWebResponse && !(request is HttpWebRequest)) throw new ArgumentException(); // It is not clear whether WebRequest.GetRespone() can ever return null, but some of the v1 code had // this check, so it is added here just in case. if (response == null) { Uri requestUri = BaseUriHelper.PackAppBaseUri.MakeRelativeUri(request.RequestUri); throw new IOException(SR.Get(SRID.GetResponseFailed, requestUri.ToString())); } HandleWebResponse(response); return response; } [FriendAccessAllowed] internal static Stream GetResponseStream(WebRequest request) { WebResponse response = GetResponse(request); return response.GetResponseStream(); } ////// Gets the response from the given request and determines the content type using the special rules /// implemented in GetContentType(). /// [FriendAccessAllowed] internal static Stream GetResponseStream(WebRequest request, out ContentType contentType) { WebResponse response = GetResponse(request); contentType = GetContentType(response); return response.GetResponseStream(); } // [Apr'07. Code moved here from BaseUriHelper.GetContentType().] ////// Tries hard to obtain the content type of the given WebResponse. Special cases: /// - The ContentType property may throw if not implemented. /// - Unconfigured web servers don't return the right type for WPF content. This method does lookup based on /// file extension. /// [FriendAccessAllowed] internal static ContentType GetContentType(WebResponse response) { ContentType contentType = ContentType.Empty; // FileWebResponse returns a generic mime type for all files regardless of extension. // We have requested fix but it's postponed to orcas. This is a work around for that. // if (!(response is FileWebResponse)) { // For all other cases use the WebResponse's ContentType if it is available try { contentType = new ContentType(response.ContentType); // If our content type is octet-stream or text/plain, we might be dealing with an unconfigured server. // If the extension is .xaml or .xbap we ignore the server's content type and determine // the content type based on the URI's extension. if (MimeTypeMapper.OctetMime.AreTypeAndSubTypeEqual(contentType, true) || MimeTypeMapper.TextPlainMime.AreTypeAndSubTypeEqual(contentType, true)) { string extension = MimeTypeMapper.GetFileExtension(response.ResponseUri); if ((String.Compare(extension, MimeTypeMapper.XamlExtension, StringComparison.OrdinalIgnoreCase) == 0) || (String.Compare(extension, MimeTypeMapper.XbapExtension, StringComparison.OrdinalIgnoreCase) == 0)) { contentType = ContentType.Empty; // Will cause GetMimeTypeFromUri to be called below } } } #pragma warning disable 6502 catch (NotImplementedException) { // this is a valid result and indicates that the subclass chose not to implement this property } catch (NotSupportedException) { // this is a valid result and indicates that the subclass chose not to implement this property } #pragma warning restore 6502 } if (contentType == ContentType.Empty) { contentType = MimeTypeMapper.GetMimeTypeFromUri(response.ResponseUri); } return contentType; } }; } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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