#region License
/*
 * WebSocketContext.cs
 *
 * The MIT License
 *
 * Copyright (c) 2012-2022 sta.blockhead
 *
 * 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.
 */
#endregion

using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Security.Principal;

namespace WebSocketSharp.Net.WebSockets
{
  /// <summary>
  /// Exposes the access to the information in a WebSocket handshake request.
  /// </summary>
  /// <remarks>
  /// This class is an abstract class.
  /// </remarks>
  public abstract class WebSocketContext
  {
    #region Protected Constructors

    /// <summary>
    /// Initializes a new instance of the <see cref="WebSocketContext"/> class.
    /// </summary>
    protected WebSocketContext ()
    {
    }

    #endregion

    #region Public Properties

    /// <summary>
    /// Gets the HTTP cookies included in the handshake request.
    /// </summary>
    /// <value>
    /// A <see cref="WebSocketSharp.Net.CookieCollection"/> that contains
    /// the cookies.
    /// </value>
    public abstract CookieCollection CookieCollection { get; }

    /// <summary>
    /// Gets the HTTP headers included in the handshake request.
    /// </summary>
    /// <value>
    /// A <see cref="NameValueCollection"/> that contains the headers.
    /// </value>
    public abstract NameValueCollection Headers { get; }

    /// <summary>
    /// Gets the value of the Host header included in the handshake request.
    /// </summary>
    /// <value>
    /// A <see cref="string"/> that represents the server host name requested
    /// by the client.
    /// </value>
    public abstract string Host { get; }

    /// <summary>
    /// Gets a value indicating whether the client is authenticated.
    /// </summary>
    /// <value>
    /// <c>true</c> if the client is authenticated; otherwise, <c>false</c>.
    /// </value>
    public abstract bool IsAuthenticated { get; }

    /// <summary>
    /// Gets a value indicating whether the handshake request is sent from
    /// the local computer.
    /// </summary>
    /// <value>
    /// <c>true</c> if the handshake request is sent from the same computer
    /// as the server; otherwise, <c>false</c>.
    /// </value>
    public abstract bool IsLocal { get; }

    /// <summary>
    /// Gets a value indicating whether a secure connection is used to send
    /// the handshake request.
    /// </summary>
    /// <value>
    /// <c>true</c> if the connection is secure; otherwise, <c>false</c>.
    /// </value>
    public abstract bool IsSecureConnection { get; }

    /// <summary>
    /// Gets a value indicating whether the request is a WebSocket handshake
    /// request.
    /// </summary>
    /// <value>
    /// <c>true</c> if the request is a WebSocket handshake request; otherwise,
    /// <c>false</c>.
    /// </value>
    public abstract bool IsWebSocketRequest { get; }

    /// <summary>
    /// Gets the value of the Origin header included in the handshake request.
    /// </summary>
    /// <value>
    /// A <see cref="string"/> that represents the value of the Origin header.
    /// </value>
    public abstract string Origin { get; }

    /// <summary>
    /// Gets the query string included in the handshake request.
    /// </summary>
    /// <value>
    /// A <see cref="NameValueCollection"/> that contains the query parameters.
    /// </value>
    public abstract NameValueCollection QueryString { get; }

    /// <summary>
    /// Gets the URI requested by the client.
    /// </summary>
    /// <value>
    /// A <see cref="Uri"/> that represents the URI parsed from the request.
    /// </value>
    public abstract Uri RequestUri { get; }

    /// <summary>
    /// Gets the value of the Sec-WebSocket-Key header included in
    /// the handshake request.
    /// </summary>
    /// <value>
    ///   <para>
    ///   A <see cref="string"/> that represents the value of
    ///   the Sec-WebSocket-Key header.
    ///   </para>
    ///   <para>
    ///   The value is used to prove that the server received
    ///   a valid WebSocket handshake request.
    ///   </para>
    /// </value>
    public abstract string SecWebSocketKey { get; }

    /// <summary>
    /// Gets the names of the subprotocols from the Sec-WebSocket-Protocol
    /// header included in the handshake request.
    /// </summary>
    /// <value>
    ///   <para>
    ///   An <see cref="T:System.Collections.Generic.IEnumerable{string}"/>
    ///   instance.
    ///   </para>
    ///   <para>
    ///   It provides an enumerator which supports the iteration over
    ///   the collection of the names of the subprotocols.
    ///   </para>
    /// </value>
    public abstract IEnumerable<string> SecWebSocketProtocols { get; }

    /// <summary>
    /// Gets the value of the Sec-WebSocket-Version header included in
    /// the handshake request.
    /// </summary>
    /// <value>
    /// A <see cref="string"/> that represents the WebSocket protocol
    /// version specified by the client.
    /// </value>
    public abstract string SecWebSocketVersion { get; }

    /// <summary>
    /// Gets the endpoint to which the handshake request is sent.
    /// </summary>
    /// <value>
    /// A <see cref="System.Net.IPEndPoint"/> that represents the server
    /// IP address and port number.
    /// </value>
    public abstract System.Net.IPEndPoint ServerEndPoint { get; }

    /// <summary>
    /// Gets the client information.
    /// </summary>
    /// <value>
    /// A <see cref="IPrincipal"/> instance that represents identity,
    /// authentication, and security roles for the client.
    /// </value>
    public abstract IPrincipal User { get; }

    /// <summary>
    /// Gets the endpoint from which the handshake request is sent.
    /// </summary>
    /// <value>
    /// A <see cref="System.Net.IPEndPoint"/> that represents the client
    /// IP address and port number.
    /// </value>
    public abstract System.Net.IPEndPoint UserEndPoint { get; }

    /// <summary>
    /// Gets the WebSocket interface used for two-way communication between
    /// the client and server.
    /// </summary>
    /// <value>
    /// A <see cref="WebSocketSharp.WebSocket"/> that represents the interface.
    /// </value>
    public abstract WebSocket WebSocket { get; }

    #endregion
  }
}
