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NSUrlSessionHandler.cs
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NSUrlSessionHandler.cs
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//
// NSUrlSessionHandler.cs:
//
// Authors:
// Ani Betts <[email protected]>
// Nick Berardi <[email protected]>
//
// 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;
using System.Collections.Generic;
using System.ComponentModel;
using System.Globalization;
using System.IO;
using System.Net;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Net.Security;
using System.Runtime.InteropServices;
using System.Security.Authentication;
using System.Security.Cryptography.X509Certificates;
using System.Threading;
using System.Threading.Tasks;
using System.Text;
using System.Diagnostics.CodeAnalysis;
using CoreFoundation;
using Foundation;
using Security;
#if !MONOMAC
using UIKit;
#endif
#nullable enable
#if !MONOMAC
namespace System.Net.Http {
#else
namespace Foundation {
#endif
#if !NET
public delegate bool NSUrlSessionHandlerTrustOverrideCallback (NSUrlSessionHandler sender, SecTrust trust);
#endif
public delegate bool NSUrlSessionHandlerTrustOverrideForUrlCallback (NSUrlSessionHandler sender, string url, SecTrust trust);
// useful extensions for the class in order to set it in a header
static class NSHttpCookieExtensions {
static void AppendSegment (StringBuilder builder, string name, string? value)
{
if (builder.Length > 0)
builder.Append ("; ");
builder.Append (name);
if (value is not null)
builder.Append ("=").Append (value);
}
// returns the header for a cookie
public static string GetHeaderValue (this NSHttpCookie cookie)
{
var header = new StringBuilder ();
AppendSegment (header, cookie.Name, cookie.Value);
AppendSegment (header, NSHttpCookie.KeyPath.ToString (), cookie.Path.ToString ());
AppendSegment (header, NSHttpCookie.KeyDomain.ToString (), cookie.Domain.ToString ());
AppendSegment (header, NSHttpCookie.KeyVersion.ToString (), cookie.Version.ToString ());
if (cookie.Comment is not null)
AppendSegment (header, NSHttpCookie.KeyComment.ToString (), cookie.Comment.ToString ());
if (cookie.CommentUrl is not null)
AppendSegment (header, NSHttpCookie.KeyCommentUrl.ToString (), cookie.CommentUrl.ToString ());
if (cookie.Properties.ContainsKey (NSHttpCookie.KeyDiscard))
AppendSegment (header, NSHttpCookie.KeyDiscard.ToString (), null);
if (cookie.ExpiresDate is not null) {
// Format according to RFC1123; 'r' uses invariant info (DateTimeFormatInfo.InvariantInfo)
var dateStr = ((DateTime) cookie.ExpiresDate).ToUniversalTime ().ToString ("r", CultureInfo.InvariantCulture);
AppendSegment (header, NSHttpCookie.KeyExpires.ToString (), dateStr);
}
if (cookie.Properties.ContainsKey (NSHttpCookie.KeyMaximumAge)) {
var timeStampString = (NSString) cookie.Properties [NSHttpCookie.KeyMaximumAge];
AppendSegment (header, NSHttpCookie.KeyMaximumAge.ToString (), timeStampString);
}
if (cookie.IsSecure)
AppendSegment (header, NSHttpCookie.KeySecure.ToString (), null);
if (cookie.IsHttpOnly)
AppendSegment (header, "httponly", null); // Apple does not show the key for the httponly
return header.ToString ();
}
}
public partial class NSUrlSessionHandler : HttpMessageHandler {
private const string SetCookie = "Set-Cookie";
private const string Cookie = "Cookie";
private CookieContainer? cookieContainer;
readonly Dictionary<string, string> headerSeparators = new Dictionary<string, string> {
["User-Agent"] = " ",
["Server"] = " "
};
NSUrlSession session;
readonly Dictionary<NSUrlSessionTask, InflightData> inflightRequests;
readonly object inflightRequestsLock = new object ();
readonly NSUrlSessionConfiguration.SessionConfigurationType sessionType;
#if !MONOMAC && !__WATCHOS__
NSObject? notificationToken; // needed to make sure we do not hang if not using a background session
readonly object notificationTokenLock = new object (); // need to make sure that threads do no step on each other with a dispose and a remove inflight data
#endif
static NSUrlSessionConfiguration CreateConfig ()
{
// modifying the configuration does not affect future calls
var config = NSUrlSessionConfiguration.DefaultSessionConfiguration;
// but we want, by default, the timeout from HttpClient to have precedence over the one from NSUrlSession
// Double.MaxValue does not work, so default to 24 hours
config.TimeoutIntervalForRequest = 24 * 60 * 60;
config.TimeoutIntervalForResource = 24 * 60 * 60;
return config;
}
public NSUrlSessionHandler () : this (CreateConfig ())
{
}
[CLSCompliant (false)]
public NSUrlSessionHandler (NSUrlSessionConfiguration configuration)
{
if (configuration is null)
ObjCRuntime.ThrowHelper.ThrowArgumentNullException (nameof (configuration));
// HACK: we need to store the following because session.Configuration gets a copy of the object and the value gets lost
sessionType = configuration.SessionType;
allowsCellularAccess = configuration.AllowsCellularAccess;
AllowAutoRedirect = true;
var sp = ServicePointManager.SecurityProtocol;
if ((sp & SecurityProtocolType.Ssl3) != 0)
configuration.TLSMinimumSupportedProtocol = SslProtocol.Ssl_3_0;
else if ((sp & SecurityProtocolType.Tls) != 0)
configuration.TLSMinimumSupportedProtocol = SslProtocol.Tls_1_0;
else if ((sp & SecurityProtocolType.Tls11) != 0)
configuration.TLSMinimumSupportedProtocol = SslProtocol.Tls_1_1;
else if ((sp & SecurityProtocolType.Tls12) != 0)
configuration.TLSMinimumSupportedProtocol = SslProtocol.Tls_1_2;
else if ((sp & (SecurityProtocolType) 12288) != 0) // Tls13 value not yet in monno
configuration.TLSMinimumSupportedProtocol = SslProtocol.Tls_1_3;
session = NSUrlSession.FromConfiguration (configuration, (INSUrlSessionDelegate) new NSUrlSessionHandlerDelegate (this), null);
inflightRequests = new Dictionary<NSUrlSessionTask, InflightData> ();
}
#if !MONOMAC && !__WATCHOS__ && !NET8_0
void AddNotification ()
{
lock (notificationTokenLock) {
if (!bypassBackgroundCheck && sessionType != NSUrlSessionConfiguration.SessionConfigurationType.Background && notificationToken is null)
notificationToken = NSNotificationCenter.DefaultCenter.AddObserver (UIApplication.WillResignActiveNotification, BackgroundNotificationCb);
} // lock
}
void RemoveNotification ()
{
NSObject? localNotificationToken;
lock (notificationTokenLock) {
localNotificationToken = notificationToken;
notificationToken = null;
}
if (localNotificationToken is not null)
NSNotificationCenter.DefaultCenter.RemoveObserver (localNotificationToken);
}
void BackgroundNotificationCb (NSNotification obj)
{
// the cancelation task of each of the sources will clean the different resources. Each removal is done
// inside a lock, but of course, the .Values collection will not like that because it is modified during the
// iteration. We split the operation in two, get all the diff cancelation sources, then try to cancel each of them
// which will do the correct lock dance. Note that we could be tempted to do a RemoveAll, that will yield the same
// runtime issue, this is dull but safe.
List<TaskCompletionSource<HttpResponseMessage>> sources;
lock (inflightRequestsLock) { // just lock when we iterate
sources = new List<TaskCompletionSource<HttpResponseMessage>> (inflightRequests.Count);
foreach (var r in inflightRequests.Values) {
sources.Add (r.CompletionSource);
}
}
sources.ForEach (source => { source.TrySetCanceled (); });
}
#endif
public long MaxInputInMemory { get; set; } = long.MaxValue;
void RemoveInflightData (NSUrlSessionTask task, bool cancel = true)
{
lock (inflightRequestsLock) {
if (inflightRequests.TryGetValue (task, out var data)) {
if (cancel)
data.CancellationTokenSource.Cancel ();
data.Dispose ();
inflightRequests.Remove (task);
}
#if !MONOMAC && !__WATCHOS__ && !NET8_0
// do we need to be notified? If we have not inflightData, we do not
if (inflightRequests.Count == 0)
RemoveNotification ();
#endif
}
if (cancel)
task?.Cancel ();
task?.Dispose ();
}
protected override void Dispose (bool disposing)
{
lock (inflightRequestsLock) {
#if !MONOMAC && !__WATCHOS__ && !NET8_0
// remove the notification if present, method checks against null
RemoveNotification ();
#endif
foreach (var pair in inflightRequests) {
pair.Key?.Cancel ();
pair.Key?.Dispose ();
pair.Value?.Dispose ();
}
inflightRequests.Clear ();
}
base.Dispose (disposing);
}
bool disableCaching;
public bool DisableCaching {
get {
return disableCaching;
}
set {
EnsureModifiability ();
disableCaching = value;
}
}
bool allowAutoRedirect;
public bool AllowAutoRedirect {
get {
return allowAutoRedirect;
}
set {
EnsureModifiability ();
allowAutoRedirect = value;
}
}
bool allowsCellularAccess = true;
public bool AllowsCellularAccess {
get {
return allowsCellularAccess;
}
set {
EnsureModifiability ();
allowsCellularAccess = value;
}
}
ICredentials? credentials;
public ICredentials? Credentials {
get {
return credentials;
}
set {
EnsureModifiability ();
credentials = value;
}
}
#if !NET
NSUrlSessionHandlerTrustOverrideCallback? trustOverride;
[Obsolete ("Use the 'TrustOverrideForUrl' property instead.")]
public NSUrlSessionHandlerTrustOverrideCallback? TrustOverride {
get {
return trustOverride;
}
set {
EnsureModifiability ();
trustOverride = value;
}
}
#endif
NSUrlSessionHandlerTrustOverrideForUrlCallback? trustOverrideForUrl;
public NSUrlSessionHandlerTrustOverrideForUrlCallback? TrustOverrideForUrl {
get {
return trustOverrideForUrl;
}
set {
EnsureModifiability ();
trustOverrideForUrl = value;
}
}
#if !NET8_0
// we do check if a user does a request and the application goes to the background, but
// in certain cases the user does that on purpose (BeingBackgroundTask) and wants to be able
// to use the network. In those cases, which are few, we want the developer to explicitly
// bypass the check when there are not request in flight
bool bypassBackgroundCheck = true;
#endif
#if !XAMCORE_5_0
[EditorBrowsable (EditorBrowsableState.Never)]
#if NET8_0
[Obsolete ("This property is ignored.")]
#else
[Obsolete ("This property will be ignored in .NET 8.")]
#endif
public bool BypassBackgroundSessionCheck {
get {
#if NET8_0
return true;
#else
return bypassBackgroundCheck;
#endif
}
set {
#if !NET8_0
EnsureModifiability ();
bypassBackgroundCheck = value;
#endif
}
}
#endif // !XAMCORE_5_0
public CookieContainer? CookieContainer {
get {
return cookieContainer;
}
set {
EnsureModifiability ();
cookieContainer = value;
}
}
public bool UseCookies {
get {
return session.Configuration.HttpCookieStorage is not null;
}
set {
EnsureModifiability ();
if (sessionType == NSUrlSessionConfiguration.SessionConfigurationType.Ephemeral)
throw new InvalidOperationException ("Cannot set the use of cookies in Ephemeral sessions.");
// we have to consider the following table of cases:
// 1. Value is set to true and cookie storage is not null -> we do nothing
// 2. Value is set to true and cookie storage is null -> we create/set the storage.
// 3. Value is false and cookie container is not null -> we clear the cookie storage
// 4. Value is false and cookie container is null -> we do nothing
var oldSession = session;
var configuration = session.Configuration;
if (value && configuration.HttpCookieStorage is null) {
// create storage because the user wants to use it. Things are not that easy, we have to
// consider the following:
// 1. Default Session -> uses sharedHTTPCookieStorage
// 2. Background Session -> uses sharedHTTPCookieStorage
// 3. Ephemeral Session -> no allowed. apple does not provide a way to access to the private implementation of the storage class :/
configuration.HttpCookieStorage = NSHttpCookieStorage.SharedStorage;
}
if (!value && configuration.HttpCookieStorage is not null) {
// remove storage so that it is not used in any of the requests
configuration.HttpCookieStorage = null;
}
session = NSUrlSession.FromConfiguration (configuration, (INSUrlSessionDelegate) new NSUrlSessionHandlerDelegate (this), null);
oldSession.Dispose ();
}
}
bool sentRequest;
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.");
}
static Exception createExceptionForNSError (NSError error)
{
var innerException = new NSErrorException (error);
// errors that exists in both share the same error code, so we can use a single switch/case
// this also ease watchOS integration as if does not expose CFNetwork but (I would not be
// surprised if it)could return some of it's error codes
#if __WATCHOS__
if (error.Domain == NSError.NSUrlErrorDomain) {
#else
if ((error.Domain == NSError.NSUrlErrorDomain) || (error.Domain == NSError.CFNetworkErrorDomain)) {
#endif
// Apple docs: https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Miscellaneous/Foundation_Constants/index.html#//apple_ref/doc/constant_group/URL_Loading_System_Error_Codes
// .NET docs: http://msdn.microsoft.com/en-us/library/system.net.webexceptionstatus(v=vs.110).aspx
switch ((NSUrlError) (long) error.Code) {
case NSUrlError.Cancelled:
case NSUrlError.UserCancelledAuthentication:
#if !__WATCHOS__
case (NSUrlError) NSNetServicesStatus.CancelledError:
#endif
// No more processing is required so just return.
return new OperationCanceledException (error.LocalizedDescription, innerException);
}
}
return new HttpRequestException (error.LocalizedDescription, innerException);
}
string GetHeaderSeparator (string name)
{
if (!headerSeparators.TryGetValue (name, out var value))
value = ",";
return value;
}
void AddManagedHeaders (NSMutableDictionary nativeHeaders, IEnumerable<KeyValuePair<string, IEnumerable<string>>> managedHeaders)
{
foreach (var keyValuePair in managedHeaders) {
var keyPtr = NSString.CreateNative (keyValuePair.Key);
var valuePtr = NSString.CreateNative (string.Join (GetHeaderSeparator (keyValuePair.Key), keyValuePair.Value));
nativeHeaders.LowlevelSetObject (valuePtr, keyPtr);
NSString.ReleaseNative (keyPtr);
NSString.ReleaseNative (valuePtr);
}
}
async Task<NSUrlRequest> CreateRequest (HttpRequestMessage request)
{
var stream = Stream.Null;
var nativeHeaders = new NSMutableDictionary ();
// set header cookies if needed from the managed cookie container if we do use Cookies
if (session.Configuration.HttpCookieStorage is not null) {
var cookies = cookieContainer?.GetCookieHeader (request.RequestUri!); // as per docs: An HTTP cookie header, with strings representing Cookie instances delimited by semicolons.
if (!string.IsNullOrEmpty (cookies)) {
var cookiePtr = NSString.CreateNative (Cookie);
var cookiesPtr = NSString.CreateNative (cookies);
nativeHeaders.LowlevelSetObject (cookiesPtr, cookiePtr);
NSString.ReleaseNative (cookiePtr);
NSString.ReleaseNative (cookiesPtr);
}
}
AddManagedHeaders (nativeHeaders, request.Headers);
if (request.Content is not null) {
stream = await request.Content.ReadAsStreamAsync ().ConfigureAwait (false);
AddManagedHeaders (nativeHeaders, request.Content.Headers);
}
var nsrequest = new NSMutableUrlRequest {
AllowsCellularAccess = allowsCellularAccess,
CachePolicy = DisableCaching ? NSUrlRequestCachePolicy.ReloadIgnoringCacheData : NSUrlRequestCachePolicy.UseProtocolCachePolicy,
HttpMethod = request.Method.ToString ().ToUpperInvariant (),
Url = NSUrl.FromString (request.RequestUri?.AbsoluteUri),
Headers = nativeHeaders,
};
if (stream != Stream.Null) {
// Rewind the stream to the beginning in case the HttpContent implementation
// will be accessed again (e.g. for retry/redirect) and it keeps its stream open behind the scenes.
if (stream.CanSeek)
stream.Seek (0, SeekOrigin.Begin);
// HttpContent.TryComputeLength is `protected internal` :-( but it's indirectly called by headers
var length = request.Content?.Headers?.ContentLength;
if (length.HasValue && (length <= MaxInputInMemory))
nsrequest.Body = NSData.FromStream (stream);
else
nsrequest.BodyStream = new WrappedNSInputStream (stream);
}
return nsrequest;
}
#if (SYSTEM_NET_HTTP || MONOMAC) && !NET
internal
#endif
protected override async Task<HttpResponseMessage> SendAsync (HttpRequestMessage request, CancellationToken cancellationToken)
{
Volatile.Write (ref sentRequest, true);
var nsrequest = await CreateRequest (request).ConfigureAwait (false);
var dataTask = session.CreateDataTask (nsrequest);
var inflightData = new InflightData (request.RequestUri?.AbsoluteUri!, cancellationToken, request);
lock (inflightRequestsLock) {
#if !MONOMAC && !__WATCHOS__ && !NET8_0
// Add the notification whenever needed
AddNotification ();
#endif
inflightRequests.Add (dataTask, inflightData);
}
if (dataTask.State == NSUrlSessionTaskState.Suspended)
dataTask.Resume ();
// as per documentation:
// If this token is already in the canceled state, the
// delegate will be run immediately and synchronously.
// Any exception the delegate generates will be
// propagated out of this method call.
//
// The execution of the register ensures that if we
// receive a already cancelled token or it is cancelled
// just before this call, we will cancel the task.
// Other approaches are harder, since querying the state
// of the token does not guarantee that in the next
// execution a threads cancels it.
cancellationToken.Register (() => {
RemoveInflightData (dataTask);
inflightData.CompletionSource.TrySetCanceled ();
});
return await inflightData.CompletionSource.Task.ConfigureAwait (false);
}
#if NET
// Properties that will be called by the default HttpClientHandler
// NSUrlSession handler automatically handles decompression, and there doesn't seem to be a way to turn it off.
// The available decompression algorithms depend on the OS version we're running on, and maybe the target OS version as well,
// so just say we're doing them all, and not do anything in the setter (it doesn't seem to be configurable in NSUrlSession anyways).
public DecompressionMethods AutomaticDecompression {
get => DecompressionMethods.All;
set { }
}
// We're ignoring this property, just like Xamarin.Android does:
// https://github.com/xamarin/xamarin-android/blob/09e8cb5c07ea6c39383185a3f90e53186749b802/src/Mono.Android/Xamarin.Android.Net/AndroidMessageHandler.cs#L158
[UnsupportedOSPlatform ("ios")]
[UnsupportedOSPlatform ("maccatalyst")]
[UnsupportedOSPlatform ("tvos")]
[UnsupportedOSPlatform ("macos")]
[EditorBrowsable (EditorBrowsableState.Never)]
public bool CheckCertificateRevocationList { get; set; } = false;
// We're ignoring this property, just like Xamarin.Android does:
// https://github.com/xamarin/xamarin-android/blob/09e8cb5c07ea6c39383185a3f90e53186749b802/src/Mono.Android/Xamarin.Android.Net/AndroidMessageHandler.cs#L150
// Note: we can't return null (like Xamarin.Android does), because the return type isn't nullable.
[UnsupportedOSPlatform ("ios")]
[UnsupportedOSPlatform ("maccatalyst")]
[UnsupportedOSPlatform ("tvos")]
[UnsupportedOSPlatform ("macos")]
[EditorBrowsable (EditorBrowsableState.Never)]
public X509CertificateCollection ClientCertificates { get { return new X509CertificateCollection (); } }
// We're ignoring this property, just like Xamarin.Android does:
// https://github.com/xamarin/xamarin-android/blob/09e8cb5c07ea6c39383185a3f90e53186749b802/src/Mono.Android/Xamarin.Android.Net/AndroidMessageHandler.cs#L148
[UnsupportedOSPlatform ("ios")]
[UnsupportedOSPlatform ("maccatalyst")]
[UnsupportedOSPlatform ("tvos")]
[UnsupportedOSPlatform ("macos")]
[EditorBrowsable (EditorBrowsableState.Never)]
public ClientCertificateOption ClientCertificateOptions { get; set; }
// We're ignoring this property, just like Xamarin.Android does:
// https://github.com/xamarin/xamarin-android/blob/09e8cb5c07ea6c39383185a3f90e53186749b802/src/Mono.Android/Xamarin.Android.Net/AndroidMessageHandler.cs#L152
[UnsupportedOSPlatform ("ios")]
[UnsupportedOSPlatform ("maccatalyst")]
[UnsupportedOSPlatform ("tvos")]
[UnsupportedOSPlatform ("macos")]
[EditorBrowsable (EditorBrowsableState.Never)]
public ICredentials? DefaultProxyCredentials { get; set; }
public int MaxAutomaticRedirections {
get => int.MaxValue;
set {
// I believe it's possible to implement support for MaxAutomaticRedirections (it just has to be done)
if (value != int.MaxValue)
ObjCRuntime.ThrowHelper.ThrowArgumentOutOfRangeException (nameof (value), value, "It's not possible to lower the max number of automatic redirections.");;
}
}
// We're ignoring this property, just like Xamarin.Android does:
// https://github.com/xamarin/xamarin-android/blob/09e8cb5c07ea6c39383185a3f90e53186749b802/src/Mono.Android/Xamarin.Android.Net/AndroidMessageHandler.cs#L154
[UnsupportedOSPlatform ("ios")]
[UnsupportedOSPlatform ("maccatalyst")]
[UnsupportedOSPlatform ("tvos")]
[UnsupportedOSPlatform ("macos")]
[EditorBrowsable (EditorBrowsableState.Never)]
public int MaxConnectionsPerServer { get; set; } = int.MaxValue;
// We're ignoring this property, just like Xamarin.Android does:
// https://github.com/xamarin/xamarin-android/blob/09e8cb5c07ea6c39383185a3f90e53186749b802/src/Mono.Android/Xamarin.Android.Net/AndroidMessageHandler.cs#L156
[UnsupportedOSPlatform ("ios")]
[UnsupportedOSPlatform ("maccatalyst")]
[UnsupportedOSPlatform ("tvos")]
[UnsupportedOSPlatform ("macos")]
[EditorBrowsable (EditorBrowsableState.Never)]
public int MaxResponseHeadersLength { get; set; } = 64; // Units in K (1024) bytes.
// We don't support PreAuthenticate, so always return false, and ignore any attempts to change it.
[UnsupportedOSPlatform ("ios")]
[UnsupportedOSPlatform ("maccatalyst")]
[UnsupportedOSPlatform ("tvos")]
[UnsupportedOSPlatform ("macos")]
[EditorBrowsable (EditorBrowsableState.Never)]
public bool PreAuthenticate {
get => false;
set { }
}
// We're ignoring this property, just like Xamarin.Android does:
// https://github.com/xamarin/xamarin-android/blob/09e8cb5c07ea6c39383185a3f90e53186749b802/src/Mono.Android/Xamarin.Android.Net/AndroidMessageHandler.cs#L167
[UnsupportedOSPlatform ("ios")]
[UnsupportedOSPlatform ("maccatalyst")]
[UnsupportedOSPlatform ("tvos")]
[UnsupportedOSPlatform ("macos")]
[EditorBrowsable (EditorBrowsableState.Never)]
public IDictionary<string, object>? Properties { get { return null; } }
// We dont support any custom proxies, and don't let anybody wonder why their proxy isn't
// being used if they try to assign one (in any case we also return false from 'SupportsProxy').
[UnsupportedOSPlatform ("ios")]
[UnsupportedOSPlatform ("maccatalyst")]
[UnsupportedOSPlatform ("tvos")]
[UnsupportedOSPlatform ("macos")]
[EditorBrowsable (EditorBrowsableState.Never)]
public IWebProxy? Proxy {
get => null;
set => throw new PlatformNotSupportedException ();
}
// There doesn't seem to be a trivial way to specify the protocols to accept (or not)
// It might be possible to reject some protocols in code during the challenge phase,
// but accepting earlier (unsafe) protocols requires adding entires to the Info.plist,
// which means it's not trivial to detect/accept/reject from code here.
// Currently the default for Apple platforms is to accept TLS v1.2 and v1.3, so default
// to that value, and ignore any changes to it.
[UnsupportedOSPlatform ("ios")]
[UnsupportedOSPlatform ("maccatalyst")]
[UnsupportedOSPlatform ("tvos")]
[UnsupportedOSPlatform ("macos")]
[EditorBrowsable (EditorBrowsableState.Never)]
public SslProtocols SslProtocols { get; set; } = SslProtocols.Tls12 | SslProtocols.Tls13;
private ServerCertificateCustomValidationCallbackHelper? _serverCertificateCustomValidationCallbackHelper;
public Func<HttpRequestMessage, X509Certificate2?, X509Chain?, SslPolicyErrors, bool>? ServerCertificateCustomValidationCallback {
get => _serverCertificateCustomValidationCallbackHelper?.Callback;
set {
if (value is null) {
_serverCertificateCustomValidationCallbackHelper = null;
} else {
_serverCertificateCustomValidationCallbackHelper = new ServerCertificateCustomValidationCallbackHelper (value);
}
}
}
// returns false if there's no callback
internal bool TryInvokeServerCertificateCustomValidationCallback (HttpRequestMessage request, SecTrust secTrust, out bool trusted)
{
trusted = false;
var helper = _serverCertificateCustomValidationCallbackHelper;
if (helper is null)
return false;
trusted = helper.Invoke (request, secTrust);
return true;
}
sealed class ServerCertificateCustomValidationCallbackHelper
{
public Func<HttpRequestMessage, X509Certificate2?, X509Chain?, SslPolicyErrors, bool> Callback { get; private set; }
public ServerCertificateCustomValidationCallbackHelper (Func<HttpRequestMessage, X509Certificate2?, X509Chain?, SslPolicyErrors, bool> callback)
{
Callback = callback;
}
public bool Invoke (HttpRequestMessage request, SecTrust secTrust)
{
X509Certificate2[] certificates = ConvertCertificates (secTrust);
X509Certificate2? certificate = certificates.Length > 0 ? certificates [0] : null;
using X509Chain chain = CreateChain (certificates);
SslPolicyErrors sslPolicyErrors = EvaluateSslPolicyErrors (certificate, chain, secTrust);
return Callback (request, certificate, chain, sslPolicyErrors);
}
X509Certificate2[] ConvertCertificates (SecTrust secTrust)
{
var certificates = new X509Certificate2 [secTrust.Count];
if (IsSecTrustGetCertificateChainSupported) {
var originalChain = secTrust.GetCertificateChain ();
for (int i = 0; i < originalChain.Length; i++)
certificates [i] = originalChain [i].ToX509Certificate2 ();
} else {
for (int i = 0; i < secTrust.Count; i++)
certificates [i] = secTrust [i].ToX509Certificate2 ();
}
return certificates;
}
static bool? isSecTrustGetCertificateChainSupported = null;
static bool IsSecTrustGetCertificateChainSupported {
get {
if (!isSecTrustGetCertificateChainSupported.HasValue) {
#if MONOMAC
isSecTrustGetCertificateChainSupported = ObjCRuntime.SystemVersion.CheckmacOS (12, 0);
#elif WATCH
isSecTrustGetCertificateChainSupported = ObjCRuntime.SystemVersion.CheckWatchOS (8, 0);
#elif IOS || TVOS || MACCATALYST
isSecTrustGetCertificateChainSupported = ObjCRuntime.SystemVersion.CheckiOS (15, 0);
#else
#error Unknown platform
#endif
}
return isSecTrustGetCertificateChainSupported.Value;
}
}
X509Chain CreateChain (X509Certificate2[] certificates)
{
// inspired by https://github.com/dotnet/runtime/blob/99d21b9276ebe8f7bea7fb3ba74dca9fca625fe2/src/libraries/System.Security.Cryptography.Pkcs/src/System/Security/Cryptography/Pkcs/SignerInfo.cs#L691-L696
var chain = new X509Chain ();
chain.ChainPolicy.RevocationMode = X509RevocationMode.Online;
chain.ChainPolicy.RevocationFlag = X509RevocationFlag.ExcludeRoot;
chain.ChainPolicy.ExtraStore.AddRange (certificates);
return chain;
}
SslPolicyErrors EvaluateSslPolicyErrors (X509Certificate2? certificate, X509Chain chain, SecTrust secTrust)
{
var sslPolicyErrors = SslPolicyErrors.None;
try {
if (certificate is null) {
sslPolicyErrors |= SslPolicyErrors.RemoteCertificateNotAvailable;
} else if (!chain.Build (certificate)) {
sslPolicyErrors |= SslPolicyErrors.RemoteCertificateChainErrors;
}
} catch (ArgumentException) {
sslPolicyErrors |= SslPolicyErrors.RemoteCertificateChainErrors;
}
if (!secTrust.Evaluate (out _)) {
sslPolicyErrors |= SslPolicyErrors.RemoteCertificateChainErrors;
}
return sslPolicyErrors;
}
}
// There's no way to turn off automatic decompression, so yes, we support it
public bool SupportsAutomaticDecompression {
get => true;
}
// We don't support using custom proxies, but NSUrlSession will automatically use any proxies configured in the OS.
public bool SupportsProxy {
get => false;
}
// We support the AllowAutoRedirect property, but we don't support changing the MaxAutomaticRedirections value,
// so be safe here and say we don't support redirect configuration.
public bool SupportsRedirectConfiguration {
get => false;
}
// NSUrlSession will automatically use any proxies configured in the OS (so always return true in the getter).
// There doesn't seem to be a way to turn this off, so throw if someone attempts to disable this.
public bool UseProxy {
get => true;
set {
if (!value)
ObjCRuntime.ThrowHelper.ThrowArgumentOutOfRangeException (nameof (value), value, "It's not possible to disable the use of system proxies.");;
}
}
#endif // NET
partial class NSUrlSessionHandlerDelegate : NSUrlSessionDataDelegate {
readonly NSUrlSessionHandler sessionHandler;
public NSUrlSessionHandlerDelegate (NSUrlSessionHandler handler)
{
sessionHandler = handler;
}
InflightData? GetInflightData (NSUrlSessionTask task)
{
var inflight = default (InflightData);
lock (sessionHandler.inflightRequestsLock)
if (sessionHandler.inflightRequests.TryGetValue (task, out inflight)) {
// ensure that we did not cancel the request, if we did, do cancel the task, if we
// cancel the task it means that we are not interested in any of the delegate methods:
//
// DidReceiveResponse We might have received a response, but either the user cancelled or a
// timeout did, if that is the case, we do not care about the response.
// DidReceiveData Of buffer has a partial response ergo garbage and there is not real
// reason we would like to add more data.
// DidCompleteWithError - We are not changing a behaviour compared to the case in which
// we did not find the data.
if (inflight.CancellationToken.IsCancellationRequested) {
task?.Cancel ();
// return null so that we break out of any delegate method.
return null;
}
return inflight;
}
// if we did not manage to get the inflight data, we either got an error or have been canceled, lets cancel the task, that will execute DidCompleteWithError
task?.Cancel ();
return null;
}
void UpdateManagedCookieContainer (Uri absoluteUri, NSHttpCookie [] cookies)
{
if (sessionHandler.cookieContainer is not null && cookies.Length > 0)
lock (sessionHandler.inflightRequestsLock) { // ensure we lock when writing to the collection
var cookiesContents = Array.ConvertAll (cookies, static cookie => cookie.GetHeaderValue ());
sessionHandler.cookieContainer.SetCookies (absoluteUri, string.Join (',', cookiesContents)); // as per docs: The contents of an HTTP set-cookie header as returned by a HTTP server, with Cookie instances delimited by commas.
}
}
[Preserve (Conditional = true)]
public override void DidReceiveResponse (NSUrlSession session, NSUrlSessionDataTask dataTask, NSUrlResponse response, Action<NSUrlSessionResponseDisposition> completionHandler)
{
var inflight = GetInflightData (dataTask);
if (inflight is null)
return;
try {
var urlResponse = (NSHttpUrlResponse) response;
var status = (int) urlResponse.StatusCode;
var absoluteUri = new Uri (urlResponse.Url.AbsoluteString!);
var content = new NSUrlSessionDataTaskStreamContent (inflight.Stream, () => {
if (!inflight.Completed) {
dataTask.Cancel ();
}
inflight.Disposed = true;
inflight.Stream.TrySetException (new ObjectDisposedException ("The content stream was disposed."));
sessionHandler.RemoveInflightData (dataTask);
}, inflight.CancellationTokenSource.Token);
// NB: The double cast is because of a Xamarin compiler bug
var httpResponse = new HttpResponseMessage ((HttpStatusCode) status) {
Content = content,
RequestMessage = inflight.Request
};
httpResponse.RequestMessage.RequestUri = absoluteUri;
foreach (var v in urlResponse.AllHeaderFields) {
// NB: Cocoa trolling us so hard by giving us back dummy dictionary entries
if (v.Key is null || v.Value is null) continue;
// NSUrlSession tries to be smart with cookies, we will not use the raw value but the ones provided by the cookie storage
if (v.Key.ToString () == SetCookie) continue;
httpResponse.Headers.TryAddWithoutValidation (v.Key.ToString (), v.Value.ToString ());
httpResponse.Content.Headers.TryAddWithoutValidation (v.Key.ToString (), v.Value.ToString ());
}
// it might be confusing that we are not using the managed CookieStore here, this is ONLY for those cookies that have been retrieved from
// the server via a Set-Cookie header, the managed container does not know a thing about this and apple is storing them in the native
// cookie container. Once we have the cookies from the response, we need to update the managed cookie container
if (session.Configuration.HttpCookieStorage is not null) {
var cookies = session.Configuration.HttpCookieStorage.CookiesForUrl (response.Url);
UpdateManagedCookieContainer (absoluteUri, cookies);
for (var index = 0; index < cookies.Length; index++) {
httpResponse.Headers.TryAddWithoutValidation (SetCookie, cookies [index].GetHeaderValue ());
}
}
inflight.Response = httpResponse;
// We don't want to send the response back to the task just yet. Because we want to mimic .NET behavior
// as much as possible. When the response is sent back in .NET, the content stream is ready to read or the
// request has completed, because of this we want to send back the response in DidReceiveData or DidCompleteWithError
if (dataTask.State == NSUrlSessionTaskState.Suspended)
dataTask.Resume ();
} catch (Exception ex) {
inflight.CompletionSource.TrySetException (ex);
inflight.Stream.TrySetException (ex);
sessionHandler.RemoveInflightData (dataTask);
}
completionHandler (NSUrlSessionResponseDisposition.Allow);
}
[Preserve (Conditional = true)]
public override void DidReceiveData (NSUrlSession session, NSUrlSessionDataTask dataTask, NSData data)
{
var inflight = GetInflightData (dataTask);
if (inflight is null)
return;
inflight.Stream.Add (data);
SetResponse (inflight);
}
[Preserve (Conditional = true)]
public override void DidCompleteWithError (NSUrlSession session, NSUrlSessionTask task, NSError? error)
{
var inflight = GetInflightData (task);
var serverError = task.Error;
// this can happen if the HTTP request times out and it is removed as part of the cancellation process
if (inflight is not null) {
// send the error or send the response back
if (error is not null || serverError is not null) {
// got an error, cancel the stream operatios before we do anything
inflight.CancellationTokenSource.Cancel ();
inflight.Errored = true;
var exc = inflight.Exception ?? createExceptionForNSError (error ?? serverError!); // client errors wont happen if we get server errors
inflight.CompletionSource.TrySetException (exc);
inflight.Stream.TrySetException (exc);
} else {
// set the stream as finished
inflight.Stream.TrySetReceivedAllData ();
inflight.Completed = true;
SetResponse (inflight);
}
sessionHandler.RemoveInflightData (task, cancel: false);
}
}
void SetResponse (InflightData inflight)
{
lock (inflight.Lock) {
if (inflight.ResponseSent)
return;
if (inflight.CancellationTokenSource.Token.IsCancellationRequested)
return;
if (inflight.CompletionSource.Task.IsCompleted)
return;
var httpResponse = inflight.Response;
inflight.ResponseSent = true;
// EVIL HACK: having TrySetResult inline was blocking the request from completing
Task.Run (() => inflight.CompletionSource.TrySetResult (httpResponse!));
}
}
[Preserve (Conditional = true)]
public override void WillCacheResponse (NSUrlSession session, NSUrlSessionDataTask dataTask, NSCachedUrlResponse proposedResponse, Action<NSCachedUrlResponse> completionHandler)
{
var inflight = GetInflightData (dataTask);
if (inflight is null)
return;
// apple caches post request with a body, which should not happen. https://github.com/xamarin/maccore/issues/2571
var disableCache = sessionHandler.DisableCaching || (inflight.Request.Method == HttpMethod.Post && inflight.Request.Content is not null);
completionHandler (disableCache ? null! : proposedResponse);
}
[Preserve (Conditional = true)]
public override void WillPerformHttpRedirection (NSUrlSession session, NSUrlSessionTask task, NSHttpUrlResponse response, NSUrlRequest newRequest, Action<NSUrlRequest> completionHandler)
{
completionHandler (sessionHandler.AllowAutoRedirect ? newRequest : null!);