564 lines
18 KiB
C#
564 lines
18 KiB
C#
#region License
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/*
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* WebSocketBehavior.cs
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*
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* The MIT License
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*
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* Copyright (c) 2012-2015 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 the methods and properties used to define the behavior of a WebSocket service
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/// provided by the <see cref="HttpServer"/> or <see cref="WebSocketServer"/>.
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/// </summary>
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/// <remarks>
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/// The WebSocketBehavior class is an abstract class.
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/// </remarks>
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public abstract class WebSocketBehavior : 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> _cookiesValidator;
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private string _id;
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private bool _ignoreExtensions;
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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 _startTime;
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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="WebSocketBehavior"/> class.
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/// </summary>
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protected WebSocketBehavior ()
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{
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_startTime = 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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/// <value>
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/// A <see cref="Logger"/> that provides the logging functions, or <see langword="null"/>
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/// if the WebSocket connection isn't established.
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/// </value>
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protected Logger Log {
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get {
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return _websocket != null ? _websocket.Log : 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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/// <value>
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/// A <see cref="WebSocketSessionManager"/> that provides the access to the sessions,
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/// or <see langword="null"/> if the WebSocket connection isn't established.
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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 a 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 connection request,
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/// or <see langword="null"/> if the WebSocket connection isn't established.
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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
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/// a connection 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 session validates
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/// 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.
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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 a 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 session,
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/// or <see langword="null"/> if the WebSocket connection isn't established.
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/// </value>
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public string ID {
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get {
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return _id;
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}
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}
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/// <summary>
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/// Gets or sets a value indicating whether the WebSocket service ignores
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/// the Sec-WebSocket-Extensions header included in a connection request.
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/// </summary>
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/// <value>
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/// <c>true</c> if the WebSocket service ignores the extensions; otherwise, <c>false</c>.
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/// The default value is <c>false</c>.
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/// </value>
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public bool IgnoreExtensions {
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get {
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return _ignoreExtensions;
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}
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set {
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_ignoreExtensions = value;
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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 Origin header included in
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/// a connection 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 session validates
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/// 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.
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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 WebSocket subprotocol used in the WebSocket service.
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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 if any.
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/// The default value is <see cref="String.Empty"/>.
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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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/// </value>
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public string Protocol {
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get {
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return _websocket != null ? _websocket.Protocol : (_protocol ?? String.Empty);
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}
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set {
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if (State != WebSocketState.Connecting)
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return;
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if (value != null && (value.Length == 0 || !value.IsToken ()))
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return;
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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 a 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 session has started,
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/// or <see cref="DateTime.MaxValue"/> if the WebSocket connection isn't established.
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/// </value>
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public DateTime StartTime {
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get {
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return _startTime;
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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 a 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
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/// the <see cref="WebSocket"/> used in the 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 ? _websocket.ReadyState : 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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_startTime = 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.CustomHandshakeRequestChecker = checkIfValidConnectionRequest;
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_websocket.IgnoreExtensions = _ignoreExtensions;
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_websocket.Protocol = _protocol;
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var waitTime = sessions.WaitTime;
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if (waitTime != _websocket.WaitTime)
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_websocket.WaitTime = waitTime;
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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"/> and
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/// <paramref name="exception"/>.
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/// </summary>
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/// <remarks>
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/// This method doesn't call the <see cref="OnError"/> method if <paramref name="message"/> is
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/// <see langword="null"/> or empty.
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/// </remarks>
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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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/// <param name="exception">
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/// An <see cref="Exception"/> instance that represents the cause of the error if any.
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/// </param>
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protected void Error (string message, Exception exception)
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{
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if (message != null && message.Length > 0)
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OnError (new ErrorEventArgs (message, exception));
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}
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/// <summary>
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/// Called when the WebSocket connection used in a 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 passed to
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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 <see cref="WebSocket"/> used in a 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 passed to
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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 <see cref="WebSocket"/> used in a 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 passed to
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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 a 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 a session.
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/// </summary>
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/// <remarks>
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/// This method is available after the WebSocket connection has been established.
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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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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 a session.
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/// </summary>
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/// <remarks>
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/// This method is available after the WebSocket connection has been established.
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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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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 a session.
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/// </summary>
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/// <remarks>
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/// This method is available after the WebSocket connection has been established.
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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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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 a session.
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/// </summary>
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/// <remarks>
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/// <para>
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/// This method is available after the WebSocket connection has been established.
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/// </para>
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/// <para>
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/// This method doesn't wait for the send to be complete.
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/// </para>
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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 <c>Action<bool></c> delegate that references the method(s) called when
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/// the send is complete. A <see cref="bool"/> passed to this delegate is <c>true</c>
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/// if the send is complete successfully.
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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
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/// to the client on a session.
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/// </summary>
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/// <remarks>
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/// <para>
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/// This method is available after the WebSocket connection has been established.
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/// </para>
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/// <para>
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/// This method doesn't wait for the send to be complete.
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/// </para>
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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 <c>Action<bool></c> delegate that references the method(s) called when
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/// the send is complete. A <see cref="bool"/> passed to this delegate is <c>true</c>
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/// if the send is complete successfully.
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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 a session.
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/// </summary>
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/// <remarks>
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/// <para>
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/// This method is available after the WebSocket connection has been established.
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/// </para>
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/// <para>
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/// This method doesn't wait for the send to be complete.
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/// </para>
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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 <c>Action<bool></c> delegate that references the method(s) called when
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/// the send is complete. A <see cref="bool"/> passed to this delegate is <c>true</c>
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/// if the send is complete successfully.
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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
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/// to the client on a session.
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/// </summary>
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/// <remarks>
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/// <para>
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/// This method is available after the WebSocket connection has been established.
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/// </para>
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/// <para>
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/// This method doesn't wait for the send to be complete.
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/// </para>
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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 <c>Action<bool></c> delegate that references the method(s) called when
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/// the send is complete. A <see cref="bool"/> passed to this delegate is <c>true</c>
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/// if the send is complete successfully.
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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)
|
|
_websocket.SendAsync (stream, length, completed);
|
|
}
|
|
|
|
#endregion
|
|
}
|
|
}
|