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//
// MonoWebRequestHandler.cs
//
// Authors:
// Marek Safar <marek.safar@gmail.com>
// Martin Baulig <mabaul@microsoft.com>
//
// Copyright (C) 2011-2018 Xamarin Inc (http://www.xamarin.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System.Collections.Generic;
using System.Security.Authentication;
using System.Security.Cryptography.X509Certificates;
using System.Security.Principal;
using System.Threading;
using System.Threading.Tasks;
using System.Collections.Specialized;
using System.Net.Http.Headers;
using System.Net.Cache;
using System.Net.Security;
using System.Linq;
namespace System.Net.Http
{
class MonoWebRequestHandler : IMonoHttpClientHandler
{
static long groupCounter;
bool allowAutoRedirect;
DecompressionMethods automaticDecompression;
CookieContainer cookieContainer;
ICredentials credentials;
int maxAutomaticRedirections;
long maxRequestContentBufferSize;
bool preAuthenticate;
IWebProxy proxy;
bool useCookies;
bool useProxy;
SslClientAuthenticationOptions sslOptions;
bool allowPipelining;
RequestCachePolicy cachePolicy;
AuthenticationLevel authenticationLevel;
TimeSpan continueTimeout;
TokenImpersonationLevel impersonationLevel;
int maxResponseHeadersLength;
int readWriteTimeout;
RemoteCertificateValidationCallback serverCertificateValidationCallback;
bool unsafeAuthenticatedConnectionSharing;
bool sentRequest;
string connectionGroupName;
TimeSpan? timeout;
bool disposed;
public MonoWebRequestHandler ()
{
allowAutoRedirect = true;
maxAutomaticRedirections = 50;
maxRequestContentBufferSize = int.MaxValue;
useCookies = true;
useProxy = true;
allowPipelining = true;
authenticationLevel = AuthenticationLevel.MutualAuthRequested;
cachePolicy = System.Net.WebRequest.DefaultCachePolicy;
continueTimeout = TimeSpan.FromMilliseconds (350);
impersonationLevel = TokenImpersonationLevel.Delegation;
maxResponseHeadersLength = HttpWebRequest.DefaultMaximumResponseHeadersLength;
readWriteTimeout = 300000;
serverCertificateValidationCallback = null;
unsafeAuthenticatedConnectionSharing = false;
connectionGroupName = "HttpClientHandler" + Interlocked.Increment (ref groupCounter);
}
internal void EnsureModifiability ()
{
if (sentRequest)
throw new InvalidOperationException (
"This instance has already started one or more requests. " +
"Properties can only be modified before sending the first request.");
}
public bool AllowAutoRedirect {
get {
return allowAutoRedirect;
}
set {
EnsureModifiability ();
allowAutoRedirect = value;
}
}
public DecompressionMethods AutomaticDecompression {
get {
return automaticDecompression;
}
set {
EnsureModifiability ();
automaticDecompression = value;
}
}
public CookieContainer CookieContainer {
get {
return cookieContainer ?? (cookieContainer = new CookieContainer ());
}
set {
EnsureModifiability ();
cookieContainer = value;
}
}
public ICredentials Credentials {
get {
return credentials;
}
set {
EnsureModifiability ();
credentials = value;
}
}
public int MaxAutomaticRedirections {
get {
return maxAutomaticRedirections;
}
set {
EnsureModifiability ();
if (value <= 0)
throw new ArgumentOutOfRangeException ();
maxAutomaticRedirections = value;
}
}
public long MaxRequestContentBufferSize {
get {
return maxRequestContentBufferSize;
}
set {
EnsureModifiability ();
if (value < 0)
throw new ArgumentOutOfRangeException ();
maxRequestContentBufferSize = value;
}
}
public bool PreAuthenticate {
get {
return preAuthenticate;
}
set {
EnsureModifiability ();
preAuthenticate = value;
}
}
public IWebProxy Proxy {
get {
return proxy;
}
set {
EnsureModifiability ();
if (!UseProxy)
throw new InvalidOperationException ();
proxy = value;
}
}
public virtual bool SupportsAutomaticDecompression {
get {
return true;
}
}
public virtual bool SupportsProxy {
get {
return true;
}
}
public virtual bool SupportsRedirectConfiguration {
get {
return true;
}
}
public bool UseCookies {
get {
return useCookies;
}
set {
EnsureModifiability ();
useCookies = value;
}
}
public bool UseProxy {
get {
return useProxy;
}
set {
EnsureModifiability ();
useProxy = value;
}
}
public bool AllowPipelining {
get { return allowPipelining; }
set {
EnsureModifiability ();
allowPipelining = value;
}
}
public RequestCachePolicy CachePolicy {
get { return cachePolicy; }
set {
EnsureModifiability ();
cachePolicy = value;
}
}
public AuthenticationLevel AuthenticationLevel {
get { return authenticationLevel; }
set {
EnsureModifiability ();
authenticationLevel = value;
}
}
[MonoTODO]
public TimeSpan ContinueTimeout {
get { return continueTimeout; }
set {
EnsureModifiability ();
continueTimeout = value;
}
}
public TokenImpersonationLevel ImpersonationLevel {
get { return impersonationLevel; }
set {
EnsureModifiability ();
impersonationLevel = value;
}
}
public int MaxResponseHeadersLength {
get { return maxResponseHeadersLength; }
set {
EnsureModifiability ();
maxResponseHeadersLength = value;
}
}
public int ReadWriteTimeout {
get { return readWriteTimeout; }
set {
EnsureModifiability ();
readWriteTimeout = value;
}
}
public RemoteCertificateValidationCallback ServerCertificateValidationCallback {
get { return serverCertificateValidationCallback; }
set {
EnsureModifiability ();
serverCertificateValidationCallback = value;
}
}
public bool UnsafeAuthenticatedConnectionSharing {
get { return unsafeAuthenticatedConnectionSharing; }
set {
EnsureModifiability ();
unsafeAuthenticatedConnectionSharing = value;
}
}
public SslClientAuthenticationOptions SslOptions {
get => sslOptions ?? (sslOptions = new SslClientAuthenticationOptions ());
set {
EnsureModifiability ();
sslOptions = value;
}
}
public void Dispose ()
{
Dispose (true);
}
protected virtual void Dispose (bool disposing)
{
if (disposing && !disposed) {
Volatile.Write (ref disposed, true);
ServicePointManager.CloseConnectionGroup (connectionGroupName);
}
}
bool GetConnectionKeepAlive (HttpRequestHeaders headers)
{
return headers.Connection.Any (l => string.Equals (l, "Keep-Alive", StringComparison.OrdinalIgnoreCase));
}
internal virtual HttpWebRequest CreateWebRequest (HttpRequestMessage request)
{
var wr = new HttpWebRequest (request.RequestUri);
wr.ThrowOnError = false;
wr.AllowWriteStreamBuffering = false;
if (request.Version == HttpVersion.Version20)
wr.ProtocolVersion = HttpVersion.Version11;
else
wr.ProtocolVersion = request.Version;
wr.ConnectionGroupName = connectionGroupName;
wr.Method = request.Method.Method;
if (wr.ProtocolVersion == HttpVersion.Version10) {
wr.KeepAlive = GetConnectionKeepAlive (request.Headers);
} else {
wr.KeepAlive = request.Headers.ConnectionClose != true;
}
if (allowAutoRedirect) {
wr.AllowAutoRedirect = true;
wr.MaximumAutomaticRedirections = maxAutomaticRedirections;
} else {
wr.AllowAutoRedirect = false;
}
wr.AutomaticDecompression = automaticDecompression;
wr.PreAuthenticate = preAuthenticate;
if (useCookies) {
// It cannot be null or allowAutoRedirect won't work
wr.CookieContainer = CookieContainer;
}
wr.Credentials = credentials;
if (useProxy) {
wr.Proxy = proxy;
} else {
// Disables default WebRequest.DefaultWebProxy value
wr.Proxy = null;
}
wr.ServicePoint.Expect100Continue = request.Headers.ExpectContinue == true;
if (timeout != null)
wr.Timeout = (int)timeout.Value.TotalMilliseconds;
// Add request headers
var headers = wr.Headers;
foreach (var header in request.Headers) {
var values = header.Value;
if (header.Key == "Host") {
//
// Host must be explicitly set for HttpWebRequest
//
wr.Host = request.Headers.Host;
continue;
}
if (header.Key == "Transfer-Encoding") {
//
// Chunked Transfer-Encoding is set for HttpWebRequest later when Content length is checked
//
values = values.Where (l => l != "chunked");
}
var values_formated = PlatformHelper.GetSingleHeaderString (header.Key, values);
if (values_formated == null)
continue;
headers.AddInternal (header.Key, values_formated);
}
return wr;
}
HttpResponseMessage CreateResponseMessage (HttpWebResponse wr, HttpRequestMessage requestMessage, CancellationToken cancellationToken)
{
var response = new HttpResponseMessage (wr.StatusCode);
response.RequestMessage = requestMessage;
response.ReasonPhrase = wr.StatusDescription;
response.Content = PlatformHelper.CreateStreamContent (wr.GetResponseStream (), cancellationToken);
var headers = wr.Headers;
for (int i = 0; i < headers.Count; ++i) {
var key = headers.GetKey (i);
var value = headers.GetValues (i);
HttpHeaders item_headers;
if (PlatformHelper.IsContentHeader (key))
item_headers = response.Content.Headers;
else
item_headers = response.Headers;
item_headers.TryAddWithoutValidation (key, value);
}
requestMessage.RequestUri = wr.ResponseUri;
return response;
}
static bool MethodHasBody (HttpMethod method)
{
switch (method.Method) {
case "HEAD":
case "GET":
case "MKCOL":
case "CONNECT":
case "TRACE":
return false;
default:
return true;
}
}
public async Task<HttpResponseMessage> SendAsync (HttpRequestMessage request, CancellationToken cancellationToken)
{
if (disposed)
throw new ObjectDisposedException (GetType ().ToString ());
Volatile.Write (ref sentRequest, true);
var wrequest = CreateWebRequest (request);
HttpWebResponse wresponse = null;
try {
using (cancellationToken.Register (l => ((HttpWebRequest)l).Abort (), wrequest)) {
var content = request.Content;
if (content != null) {
var headers = wrequest.Headers;
foreach (var header in content.Headers) {
foreach (var value in header.Value) {
headers.AddInternal (header.Key, value);
}
}
if (request.Headers.TransferEncodingChunked == true) {
wrequest.SendChunked = true;
} else {
//
// Content length has to be set because HttpWebRequest is running without buffering
//
var contentLength = content.Headers.ContentLength;
if (contentLength != null) {
wrequest.ContentLength = contentLength.Value;
} else {
if (MaxRequestContentBufferSize == 0)
throw new InvalidOperationException ("The content length of the request content can't be determined. Either set TransferEncodingChunked to true, load content into buffer, or set MaxRequestContentBufferSize.");
await content.LoadIntoBufferAsync (MaxRequestContentBufferSize).ConfigureAwait (false);
wrequest.ContentLength = content.Headers.ContentLength.Value;
}
}
wrequest.ResendContentFactory = content.CopyToAsync;
using (var stream = await wrequest.GetRequestStreamAsync ().ConfigureAwait (false)) {
await request.Content.CopyToAsync (stream).ConfigureAwait (false);
}
} else if (MethodHasBody (request.Method)) {
// Explicitly set this to make sure we're sending a "Content-Length: 0" header.
// This fixes the issue that's been reported on the forums:
// http://forums.xamarin.com/discussion/17770/length-required-error-in-http-post-since-latest-release
wrequest.ContentLength = 0;
}
wresponse = (HttpWebResponse)await wrequest.GetResponseAsync ().ConfigureAwait (false);
}
} catch (WebException we) {
if (we.Status != WebExceptionStatus.RequestCanceled)
throw new HttpRequestException ("An error occurred while sending the request", we);
} catch (System.IO.IOException ex) {
throw new HttpRequestException ("An error occurred while sending the request", ex);
}
if (cancellationToken.IsCancellationRequested) {
var cancelled = new TaskCompletionSource<HttpResponseMessage> ();
cancelled.SetCanceled ();
return await cancelled.Task;
}
return CreateResponseMessage (wresponse, request, cancellationToken);
}
public ICredentials DefaultProxyCredentials {
get {
throw new NotImplementedException ();
}
set {
throw new NotImplementedException ();
}
}
public int MaxConnectionsPerServer {
get {
throw new NotImplementedException ();
}
set {
throw new NotImplementedException ();
}
}
public IDictionary<string, object> Properties {
get {
throw new NotImplementedException ();
}
}
void IMonoHttpClientHandler.SetWebRequestTimeout (TimeSpan timeout)
{
this.timeout = timeout;
}
}
}
|