// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
namespace Microsoft.AspNetCore.Http.Connections;
 
/// <summary>
/// Options used by the WebSockets transport to modify the transports behavior.
/// </summary>
public class WebSocketOptions
{
    /// <summary>
    /// Gets or sets the amount of time the WebSocket transport will wait for a graceful close before starting an ungraceful close.
    /// </summary>
    /// <value>Defaults to 5 seconds</value>
    public TimeSpan CloseTimeout { get; set; } = TimeSpan.FromSeconds(5);
 
    /// <summary>
    /// Gets or sets a delegate that will be called when a new WebSocket is established to select the value
    /// for the 'Sec-WebSocket-Protocol' response header. The delegate will be called with a list of the protocols provided
    /// by the client in the 'Sec-WebSocket-Protocol' request header.
    /// </summary>
    /// <remarks>
    /// See RFC 6455 section 1.3 for more details on the WebSocket handshake: <see href="https://tools.ietf.org/html/rfc6455#section-1.3"/>
    /// </remarks>
    // WebSocketManager's list of sub protocols is an IList:
    // https://github.com/aspnet/HttpAbstractions/blob/a6bdb9b1ec6ed99978a508e71a7f131be7e4d9fb/src/Microsoft.AspNetCore.Http.Abstractions/WebSocketManager.cs#L23
    // Unfortunately, IList<T> does not implement IReadOnlyList<T> :(
    public Func<IList<string>, string>? SubProtocolSelector { get; set; }
}