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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//
//
// Description:
// WebRequest class to handle requests for pack-specific URI's that can be satisfied
// from the PackageStore.
//
//
#if DEBUG
#define TRACE
#endif
using System;
using System.IO;
using System.IO.Packaging;
using System.Net;
using System.Net.Cache; // for RequestCachePolicy
using System.Runtime.Serialization;
using System.Diagnostics; // For Assert
using MS.Utility; // for EventTrace
using MS.Internal.IO.Packaging; // for PackageCacheEntry
using MS.Internal.PresentationCore; // for SR exception strings
using MS.Internal;
namespace MS.Internal.IO.Packaging
{
/// <summary>
/// pack-specific WebRequest handler for cached packages
/// </summary>
internal class PseudoWebRequest : WebRequest
{
//------------------------------------------------------
//
// Constructors
//
//------------------------------------------------------
/// <summary>
/// Cached instance constructor
/// </summary>
/// <param name="uri">uri to resolve</param>
/// <param name="packageUri">uri of the package</param>
/// <param name="partUri">uri of the part - may be null</param>
/// <param name="cacheEntry">cache entry to base this response on</param>
#pragma warning disable SYSLIB0014
internal PseudoWebRequest(Uri uri, Uri packageUri, Uri partUri, Package cacheEntry)
{
Debug.Assert(uri != null, "PackWebRequest uri cannot be null");
Debug.Assert(packageUri != null, "packageUri cannot be null");
Debug.Assert(partUri != null, "partUri cannot be null");
// keep these
_uri = uri;
_innerUri = packageUri;
_partName = partUri;
_cacheEntry = cacheEntry;
// set defaults
SetDefaults();
}
#pragma warning restore SYSLIB0014
//------------------------------------------------------
//
// Public Methods
//
//------------------------------------------------------
#region WebRequest - Sync
/// <summary>
/// GetRequestStream
/// </summary>
/// <returns>stream</returns>
/// <exception cref="NotSupportedException">writing not supported</exception>
public override Stream GetRequestStream()
{
throw new NotSupportedException();
}
/// <summary>
/// Do not call
/// </summary>
/// <returns>null</returns>
public override WebResponse GetResponse()
{
Invariant.Assert(false, "PackWebRequest must handle this method.");
return null;
}
#endregion
//------------------------------------------------------
//
// Public Properties
//
//------------------------------------------------------
#region Properties
/// <summary>
/// CachePolicy for the PackWebRequest
/// </summary>
/// <remarks>This value is distinct from the CachePolicy of the InnerRequest.</remarks>
/// <value></value>
public override RequestCachePolicy CachePolicy
{
get
{
Invariant.Assert(false, "PackWebRequest must handle this method.");
return null;
}
set
{
Invariant.Assert(false, "PackWebRequest must handle this method.");
}
}
/// <summary>
/// ConnectionGroupName
/// </summary>
/// <remarks>String.Empty is the default value</remarks>
public override string ConnectionGroupName
{
get
{
return _connectionGroupName;
}
set
{
_connectionGroupName = value;
}
}
/// <summary>
/// ContentLength
/// </summary>
/// <value>length of RequestStream</value>
public override long ContentLength
{
get
{
return _contentLength;
}
set
{
throw new NotSupportedException();
}
}
/// <summary>
/// ContentType
/// </summary>
public override string ContentType
{
get
{
return _contentType;
}
set
{
// null is explicitly allowed
_contentType = value;
}
}
/// <summary>
/// Credentials
/// </summary>
/// <value>Credentials to use when authenticating against the resource</value>
/// <remarks>null is the default value.</remarks>
public override ICredentials Credentials
{
get
{
return _credentials;
}
set
{
_credentials = value;
}
}
/// <summary>
/// Headers
/// </summary>
/// <value>collection of header name/value pairs associated with the request</value>
/// <remarks>Default is an empty collection. Null is not a valid value.</remarks>
public override WebHeaderCollection Headers
{
get
{
// lazy init
if (_headers == null)
_headers = new WebHeaderCollection();
return _headers;
}
set
{
ArgumentNullException.ThrowIfNull(value);
_headers = value;
}
}
/// <summary>
/// Method
/// </summary>
/// <value>protocol method to use in this request</value>
/// <remarks>This value is shared with the InnerRequest.</remarks>
public override string Method
{
get
{
return _method;
}
set
{
ArgumentNullException.ThrowIfNull(value);
_method = value;
}
}
/// <summary>
/// PreAuthenticate
/// </summary>
/// <remarks>default is false</remarks>
public override bool PreAuthenticate
{
get
{
return _preAuthenticate;
}
set
{
_preAuthenticate = value;
}
}
/// <summary>
/// Proxy
/// </summary>
public override IWebProxy Proxy
{
get
{
// lazy init
if (_proxy == null)
_proxy = WebRequest.DefaultWebProxy;
return _proxy;
}
set
{
_proxy = value;
}
}
/// <summary>
/// Timeout
/// </summary>
/// <value>length of time before the request times out</value>
/// <remarks>This value is shared with the InnerRequest.</remarks>
/// <exception cref="ArgumentOutOfRangeException">Value must be >= -1</exception>
public override int Timeout
{
get
{
return _timeout;
}
set
{
if (value != System.Threading.Timeout.Infinite)
{
// negative time that is not -1 (infinite) is an error case
ArgumentOutOfRangeException.ThrowIfNegative(value);
}
_timeout = value;
}
}
/// <summary>
/// UseDefaultCredentials
/// </summary>
/// <remarks>This is an odd case where http acts "normally" but ftp throws NotSupportedException.</remarks>
public override bool UseDefaultCredentials
{
get
{
// ftp throws on this
if (IsScheme(Uri.UriSchemeFtp))
throw new NotSupportedException();
return _useDefaultCredentials;
}
set
{
// ftp throws on this
if (IsScheme(Uri.UriSchemeFtp))
throw new NotSupportedException();
_useDefaultCredentials = value;
}
}
#endregion
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
//------------------------------------------------------
//
// Internal Properties
//
//------------------------------------------------------
//------------------------------------------------------
//
// Private Methods
//
//------------------------------------------------------
private bool IsScheme(String schemeName)
{
return (string.Equals(_innerUri.Scheme, schemeName, StringComparison.Ordinal));
}
/// <summary>
/// Non-value members are lazy-initialized if possible
/// </summary>
private void SetDefaults()
{
// set defaults
_connectionGroupName = String.Empty; // http default
_contentType = null; // default
_credentials = null; // actual default
_headers = null; // lazy init
_preAuthenticate = false; // http default
_proxy = null; // lazy init
if (IsScheme(Uri.UriSchemeHttp))
{
_timeout = 100000; // http default - 100s
_method = WebRequestMethods.Http.Get; // http default
}
else
_timeout = System.Threading.Timeout.Infinite; // ftp default and appropriate for cached file
if (IsScheme(Uri.UriSchemeFtp))
_method = WebRequestMethods.Ftp.DownloadFile; // ftp default
_useDefaultCredentials = false; // http default
_contentLength = -1; // we don't support upload
}
//------------------------------------------------------
//
// Private Fields
//
//------------------------------------------------------
private Uri _uri; // pack uri
private Uri _innerUri; // inner uri extracted from the pack uri
private Uri _partName; // name of PackagePart (if any) - null for full-container references
private Package _cacheEntry; // cached package
// local copies of public members
private string _connectionGroupName;
private string _contentType; // value of [CONTENT-TYPE] in WebHeaderCollection - provided by server
private int _contentLength; // length of data to upload - should be -1
private string _method;
private ICredentials _credentials; // default is null
private WebHeaderCollection _headers; // empty is default
private bool _preAuthenticate; // default to false
private IWebProxy _proxy;
private int _timeout; // timeout
private bool _useDefaultCredentials; // default is false for HTTP, exception for FTP
}
}
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