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WebSocketClient.cs
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WebSocketClient.cs
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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.
using System.Diagnostics;
using System.Linq;
using System.Net.WebSockets;
using System.Security.Cryptography;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Http.Features;
using Microsoft.Net.Http.Headers;
namespace Microsoft.AspNetCore.TestHost;
/// <summary>
/// Provides a client for connecting over WebSockets to a test server.
/// </summary>
public class WebSocketClient
{
private readonly ApplicationWrapper _application;
private readonly PathString _pathBase;
internal WebSocketClient(PathString pathBase, ApplicationWrapper application)
{
_application = application ?? throw new ArgumentNullException(nameof(application));
// PathString.StartsWithSegments that we use below requires the base path to not end in a slash.
if (pathBase.HasValue && pathBase.Value.EndsWith('/'))
{
pathBase = new PathString(pathBase.Value[..^1]); // All but the last character.
}
_pathBase = pathBase;
SubProtocols = new List<string>();
}
/// <summary>
/// Gets the list of WebSocket subprotocols that are established in the initial handshake.
/// </summary>
public IList<string> SubProtocols { get; }
/// <summary>
/// Gets or sets the handler used to configure the outgoing request to the WebSocket endpoint.
/// </summary>
public Action<HttpRequest>? ConfigureRequest { get; set; }
internal bool AllowSynchronousIO { get; set; }
internal bool PreserveExecutionContext { get; set; }
/// <summary>
/// Establishes a WebSocket connection to an endpoint.
/// </summary>
/// <param name="uri">The <see cref="Uri" /> of the endpoint.</param>
/// <param name="cancellationToken">A <see cref="CancellationToken"/> used to terminate the connection.</param>
public async Task<WebSocket> ConnectAsync(Uri uri, CancellationToken cancellationToken)
{
WebSocketFeature? webSocketFeature = null;
var contextBuilder = new HttpContextBuilder(_application, AllowSynchronousIO, PreserveExecutionContext);
contextBuilder.Configure((context, reader) =>
{
var request = context.Request;
var scheme = uri.Scheme;
scheme = (scheme == "ws") ? "http" : scheme;
scheme = (scheme == "wss") ? "https" : scheme;
request.Scheme = scheme;
if (!request.Host.HasValue)
{
request.Host = uri.IsDefaultPort
? new HostString(HostString.FromUriComponent(uri).Host)
: HostString.FromUriComponent(uri);
}
request.Path = PathString.FromUriComponent(uri);
request.PathBase = PathString.Empty;
if (request.Path.StartsWithSegments(_pathBase, out var remainder))
{
request.Path = remainder;
request.PathBase = _pathBase;
}
request.QueryString = QueryString.FromUriComponent(uri);
request.Headers.Add(HeaderNames.Connection, new string[] { "Upgrade" });
request.Headers.Add(HeaderNames.Upgrade, new string[] { "websocket" });
request.Headers.Add(HeaderNames.SecWebSocketVersion, new string[] { "13" });
request.Headers.Add(HeaderNames.SecWebSocketKey, new string[] { CreateRequestKey() });
if (SubProtocols.Any())
{
request.Headers.Add(HeaderNames.SecWebSocketProtocol, SubProtocols.ToArray());
}
request.Body = Stream.Null;
// WebSocket
webSocketFeature = new WebSocketFeature(context);
context.Features.Set<IHttpWebSocketFeature>(webSocketFeature);
ConfigureRequest?.Invoke(context.Request);
});
var httpContext = await contextBuilder.SendAsync(cancellationToken);
if (httpContext.Response.StatusCode != StatusCodes.Status101SwitchingProtocols)
{
throw new InvalidOperationException("Incomplete handshake, status code: " + httpContext.Response.StatusCode);
}
Debug.Assert(webSocketFeature != null);
if (webSocketFeature.ClientWebSocket == null)
{
throw new InvalidOperationException("Incomplete handshake");
}
return webSocketFeature.ClientWebSocket;
}
private static string CreateRequestKey()
{
byte[] data = new byte[16];
RandomNumberGenerator.Fill(data);
return Convert.ToBase64String(data);
}
private sealed class WebSocketFeature : IHttpWebSocketFeature
{
private readonly HttpContext _httpContext;
public WebSocketFeature(HttpContext context)
{
_httpContext = context;
}
bool IHttpWebSocketFeature.IsWebSocketRequest => true;
public WebSocket? ClientWebSocket { get; private set; }
public WebSocket? ServerWebSocket { get; private set; }
async Task<WebSocket> IHttpWebSocketFeature.AcceptAsync(WebSocketAcceptContext context)
{
var websockets = TestWebSocket.CreatePair(context.SubProtocol);
if (_httpContext.Response.HasStarted)
{
throw new InvalidOperationException("The response has already started");
}
_httpContext.Response.StatusCode = StatusCodes.Status101SwitchingProtocols;
ClientWebSocket = websockets.Item1;
ServerWebSocket = websockets.Item2;
await _httpContext.Response.Body.FlushAsync(_httpContext.RequestAborted); // Send headers to the client
return ServerWebSocket;
}
}
}