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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