511 lines
16 KiB
C#
511 lines
16 KiB
C#
#region License
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/*
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* WebSocketService.cs
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*
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* The MIT License
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*
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* Copyright (c) 2012-2014 sta.blockhead
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#endregion
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using System;
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using System.IO;
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using WebSocketSharp.Net;
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using WebSocketSharp.Net.WebSockets;
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namespace WebSocketSharp.Server
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{
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/// <summary>
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/// Exposes a set of the methods and properties for a WebSocket service provided by the
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/// <see cref="HttpServer"/> or <see cref="WebSocketServer"/>.
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/// </summary>
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/// <remarks>
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/// The WebSocketService class is an abstract class.
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/// </remarks>
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public abstract class WebSocketService : IWebSocketSession
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{
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#region Private Fields
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private WebSocketContext _context;
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private Func<CookieCollection, CookieCollection, bool>
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_cookiesValidator;
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private Func<string, bool> _originValidator;
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private string _protocol;
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private WebSocketSessionManager _sessions;
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private DateTime _start;
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private WebSocket _websocket;
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#endregion
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#region Protected Constructors
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/// <summary>
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/// Initializes a new instance of the <see cref="WebSocketService"/> class.
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/// </summary>
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protected WebSocketService ()
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{
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_start = DateTime.MaxValue;
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}
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#endregion
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#region Protected Properties
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/// <summary>
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/// Gets the logging functions.
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/// </summary>
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/// <remarks>
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/// This property is available after the WebSocket connection has been established.
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/// </remarks>
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/// <value>
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/// A <see cref="Logger"/> that provides the logging functions.
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/// </value>
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protected Logger Log {
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get {
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return _websocket != null
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? _websocket.Log
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: null;
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}
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}
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/// <summary>
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/// Gets the access to the sessions in the WebSocket service.
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/// </summary>
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/// <remarks>
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/// This property is available after the WebSocket connection has been established.
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/// </remarks>
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/// <value>
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/// A <see cref="WebSocketSessionManager"/> that provides the access to the sessions.
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/// </value>
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protected WebSocketSessionManager Sessions {
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get {
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return _sessions;
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}
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}
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#endregion
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#region Public Properties
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/// <summary>
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/// Gets the information in the current connection request to the WebSocket service.
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/// </summary>
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/// <value>
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/// A <see cref="WebSocketContext"/> that provides the access to the current connection request.
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/// </value>
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public WebSocketContext Context {
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get {
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return _context;
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}
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}
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/// <summary>
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/// Gets or sets the delegate called to validate the HTTP cookies included in a connection
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/// request to the WebSocket service.
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/// </summary>
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/// <remarks>
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/// The delegate is called when the <see cref="WebSocket"/> used in the current session
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/// validates the connection request.
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/// </remarks>
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/// <value>
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/// <para>
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/// A <c>Func<CookieCollection, CookieCollection, bool></c> delegate that references
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/// the method(s) used to validate the cookies. 1st <see cref="CookieCollection"/> passed to
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/// this delegate contains the cookies to validate, if any. 2nd <see cref="CookieCollection"/>
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/// passed to this delegate receives the cookies to send to the client.
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/// </para>
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/// <para>
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/// This delegate should return <c>true</c> if the cookies are valid; otherwise, <c>false</c>.
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/// </para>
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/// <para>
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/// The default value is <see langword="null"/>, and it does nothing to validate.
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/// </para>
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/// </value>
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public Func<CookieCollection, CookieCollection, bool> CookiesValidator {
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get {
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return _cookiesValidator;
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}
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set {
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_cookiesValidator = value;
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}
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}
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/// <summary>
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/// Gets the unique ID of the current session.
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/// </summary>
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/// <value>
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/// A <see cref="string"/> that represents the unique ID of the current session.
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/// </value>
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public string ID {
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get; private set;
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}
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/// <summary>
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/// Gets or sets the delegate called to validate the Origin header included in a connection
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/// request to the WebSocket service.
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/// </summary>
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/// <remarks>
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/// The delegate is called when the <see cref="WebSocket"/> used in the current session
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/// validates the connection request.
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/// </remarks>
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/// <value>
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/// <para>
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/// A <c>Func<string, bool></c> delegate that references the method(s) used to validate
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/// the origin header. A <see cref="string"/> passed to this delegate represents the value of
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/// the origin header to validate, if any.
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/// </para>
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/// <para>
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/// This delegate should return <c>true</c> if the origin header is valid; otherwise,
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/// <c>false</c>.
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/// </para>
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/// <para>
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/// The default value is <see langword="null"/>, and it does nothing to validate.
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/// </para>
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/// </value>
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public Func<string, bool> OriginValidator {
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get {
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return _originValidator;
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}
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set {
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_originValidator = value;
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}
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}
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/// <summary>
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/// Gets or sets the subprotocol of the <see cref="WebSocket"/> used in the current session.
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/// </summary>
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/// <remarks>
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/// Set operation of this property is available before the WebSocket connection has been
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/// established.
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/// </remarks>
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/// <value>
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/// <para>
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/// A <see cref="string"/> that represents the subprotocol of the <see cref="WebSocket"/>
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/// used in the current session if any.
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/// </para>
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/// <para>
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/// The value to set must be a token defined in
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/// <see href="http://tools.ietf.org/html/rfc2616#section-2.2">RFC 2616</see>.
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/// </para>
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/// <para>
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/// The default value is <see cref="String.Empty"/>.
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/// </para>
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/// </value>
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public string Protocol {
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get {
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return _websocket != null
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? _websocket.Protocol
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: _protocol ?? String.Empty;
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}
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set {
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if (State == WebSocketState.Connecting &&
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value != null &&
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value.Length > 0 &&
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value.IsToken ())
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_protocol = value;
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}
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}
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/// <summary>
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/// Gets the time that the current session has started.
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/// </summary>
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/// <value>
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/// A <see cref="DateTime"/> that represents the time that the current session has started.
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/// </value>
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public DateTime StartTime {
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get {
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return _start;
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}
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}
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/// <summary>
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/// Gets the state of the <see cref="WebSocket"/> used in the current session.
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/// </summary>
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/// <value>
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/// One of the <see cref="WebSocketState"/> enum values, indicates the state of the
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/// <see cref="WebSocket"/> used in the current session.
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/// </value>
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public WebSocketState State {
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get {
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return _websocket != null
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? _websocket.ReadyState
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: WebSocketState.Connecting;
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}
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}
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#endregion
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#region Private Methods
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private string checkIfValidConnectionRequest (WebSocketContext context)
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{
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return _originValidator != null && !_originValidator (context.Origin)
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? "Invalid Origin header."
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: _cookiesValidator != null &&
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!_cookiesValidator (context.CookieCollection, context.WebSocket.CookieCollection)
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? "Invalid Cookies."
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: null;
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}
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private void onClose (object sender, CloseEventArgs e)
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{
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if (ID == null)
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return;
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_sessions.Remove (ID);
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OnClose (e);
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}
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private void onError (object sender, ErrorEventArgs e)
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{
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OnError (e);
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}
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private void onMessage (object sender, MessageEventArgs e)
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{
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OnMessage (e);
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}
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private void onOpen (object sender, EventArgs e)
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{
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ID = _sessions.Add (this);
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if (ID == null) {
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_websocket.Close (CloseStatusCode.Away);
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return;
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}
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_start = DateTime.Now;
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OnOpen ();
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}
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#endregion
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#region Internal Methods
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internal void Start (WebSocketContext context, WebSocketSessionManager sessions)
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{
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if (_websocket != null) {
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_websocket.Log.Error ("This session has already been started.");
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context.WebSocket.Close (HttpStatusCode.ServiceUnavailable);
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return;
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}
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_context = context;
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_sessions = sessions;
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_websocket = context.WebSocket;
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_websocket.Protocol = _protocol;
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_websocket.CustomHandshakeRequestChecker = checkIfValidConnectionRequest;
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_websocket.OnOpen += onOpen;
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_websocket.OnMessage += onMessage;
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_websocket.OnError += onError;
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_websocket.OnClose += onClose;
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_websocket.ConnectAsServer ();
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}
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#endregion
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#region Protected Methods
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/// <summary>
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/// Calls the <see cref="OnError"/> method with the specified <paramref name="message"/>.
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/// </summary>
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/// <param name="message">
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/// A <see cref="string"/> that represents the error message.
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/// </param>
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protected void Error (string message)
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{
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if (message != null && message.Length > 0)
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OnError (new ErrorEventArgs (message));
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}
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/// <summary>
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/// Called when the WebSocket connection used in the current session has been closed.
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/// </summary>
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/// <param name="e">
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/// A <see cref="CloseEventArgs"/> that represents the event data received by
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/// a <see cref="WebSocket.OnClose"/> event.
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/// </param>
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protected virtual void OnClose (CloseEventArgs e)
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{
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}
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/// <summary>
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/// Called when the current session gets an error.
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/// </summary>
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/// <param name="e">
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/// A <see cref="ErrorEventArgs"/> that represents the event data received by
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/// a <see cref="WebSocket.OnError"/> event.
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/// </param>
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protected virtual void OnError (ErrorEventArgs e)
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{
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}
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/// <summary>
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/// Called when the current session receives a message.
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/// </summary>
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/// <param name="e">
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/// A <see cref="MessageEventArgs"/> that represents the event data received by
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/// a <see cref="WebSocket.OnMessage"/> event.
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/// </param>
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protected virtual void OnMessage (MessageEventArgs e)
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{
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}
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/// <summary>
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/// Called when the WebSocket connection used in the current session has been established.
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/// </summary>
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protected virtual void OnOpen ()
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{
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}
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/// <summary>
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/// Sends a binary <paramref name="data"/> to the client on the current session.
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/// </summary>
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/// <param name="data">
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/// An array of <see cref="byte"/> that represents the binary data to send.
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/// </param>
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protected void Send (byte [] data)
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{
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if (_websocket != null)
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_websocket.Send (data);
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}
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/// <summary>
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/// Sends the specified <paramref name="file"/> as a binary data to the client on the current
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/// session.
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/// </summary>
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/// <param name="file">
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/// A <see cref="FileInfo"/> that represents the file to send.
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/// </param>
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protected void Send (FileInfo file)
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{
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if (_websocket != null)
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_websocket.Send (file);
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}
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/// <summary>
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/// Sends a text <paramref name="data"/> to the client on the current session.
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/// </summary>
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/// <param name="data">
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/// A <see cref="string"/> that represents the text data to send.
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/// </param>
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protected void Send (string data)
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{
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if (_websocket != null)
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_websocket.Send (data);
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}
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/// <summary>
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/// Sends a binary <paramref name="data"/> asynchronously to the client on the current session.
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/// </summary>
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/// <remarks>
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/// This method doesn't wait for the send to be complete.
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/// </remarks>
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/// <param name="data">
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/// An array of <see cref="byte"/> that represents the binary data to send.
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/// </param>
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/// <param name="completed">
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/// An Action<bool> delegate that references the method(s) called when the send is
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/// complete. A <see cref="bool"/> passed to this delegate is <c>true</c> if the send is
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/// complete successfully; otherwise, <c>false</c>.
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/// </param>
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protected void SendAsync (byte [] data, Action<bool> completed)
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{
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if (_websocket != null)
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_websocket.SendAsync (data, completed);
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}
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/// <summary>
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/// Sends the specified <paramref name="file"/> as a binary data asynchronously to the client
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/// on the current session.
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/// </summary>
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/// <remarks>
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/// This method doesn't wait for the send to be complete.
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/// </remarks>
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/// <param name="file">
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/// A <see cref="FileInfo"/> that represents the file to send.
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/// </param>
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/// <param name="completed">
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/// An Action<bool> delegate that references the method(s) called when the send is
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/// complete. A <see cref="bool"/> passed to this delegate is <c>true</c> if the send is
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/// complete successfully; otherwise, <c>false</c>.
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/// </param>
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protected void SendAsync (FileInfo file, Action<bool> completed)
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{
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if (_websocket != null)
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_websocket.SendAsync (file, completed);
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}
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/// <summary>
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/// Sends a text <paramref name="data"/> asynchronously to the client on the current session.
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/// </summary>
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/// <remarks>
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/// This method doesn't wait for the send to be complete.
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/// </remarks>
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/// <param name="data">
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/// A <see cref="string"/> that represents the text data to send.
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/// </param>
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/// <param name="completed">
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/// An Action<bool> delegate that references the method(s) called when the send is
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/// complete. A <see cref="bool"/> passed to this delegate is <c>true</c> if the send is
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/// complete successfully; otherwise, <c>false</c>.
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/// </param>
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protected void SendAsync (string data, Action<bool> completed)
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{
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if (_websocket != null)
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_websocket.SendAsync (data, completed);
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}
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/// <summary>
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/// Sends a binary data from the specified <see cref="Stream"/> asynchronously to the client on
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/// the current session.
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/// </summary>
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/// <remarks>
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/// This method doesn't wait for the send to be complete.
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/// </remarks>
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/// <param name="stream">
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/// A <see cref="Stream"/> from which contains the binary data to send.
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/// </param>
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/// <param name="length">
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/// An <see cref="int"/> that represents the number of bytes to send.
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/// </param>
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/// <param name="completed">
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/// An Action<bool> delegate that references the method(s) called when the send is
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/// complete. A <see cref="bool"/> passed to this delegate is <c>true</c> if the send is
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/// complete successfully; otherwise, <c>false</c>.
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/// </param>
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protected void SendAsync (Stream stream, int length, Action<bool> completed)
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{
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if (_websocket != null)
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_websocket.SendAsync (stream, length, completed);
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}
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#endregion
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}
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}
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