Merge.

[irc/quakenet/qwebirc.git] / static / js / flash_web_socket-nc.js

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//Copyright (c) 2013, Hiroshi Ichikawa
//All rights reserved.
//
//Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
//
//Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
//Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
//Neither the name of the Hiroshi Ichikawa nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
//THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Copyright: Hiroshi Ichikawa <http://gimite.net/en/>
// License: New BSD License
// Reference: http://dev.w3.org/html5/websockets/
// Reference: http://tools.ietf.org/html/rfc6455
window.WEB_SOCKET_SWF_LOCATION = qwebirc.global.staticBaseURL + "/WebSocketMain.swf";
window.WEB_SOCKET_LOGGER = qwebirc.util.logger;

(function() {
  if (window.WEB_SOCKET_FORCE_FLASH) {
    // Keeps going.
  } else if (window.WebSocket) {
    return;
  } else if (window.MozWebSocket) {
    // Firefox.
    window.WebSocket = MozWebSocket;
    return;
  }

  var logger;
  if (window.WEB_SOCKET_LOGGER) {
    logger = WEB_SOCKET_LOGGER;
  } else if (window.console && window.console.log && window.console.error) {
    // In some environment, console is defined but console.log or console.error is missing.
    logger = window.console;
  } else {
    logger = {log: function(){ }, error: function(){ }};
  }

  // swfobject.hasFlashPlayerVersion("10.0.0") doesn't work with Gnash.
  if (swfobject.getFlashPlayerVersion().major < 10) {
    logger.error("Flash Player >= 10.0.0 is required.");
    return;
  }
  if (location.protocol == "file:") {
    logger.error(
      "WARNING: web-socket-js doesn't work in file:///... URL " +
        "unless you set Flash Security Settings properly. " +
        "Open the page via Web server i.e. http://...");
  }

  /**
   * Our own implementation of WebSocket class using Flash.
   * @param {string} url
   * @param {array or string} protocols
   * @param {string} proxyHost
   * @param {int} proxyPort
   * @param {string} headers
   */
  window.WebSocket = function(url, protocols, proxyHost, proxyPort, headers) {
    var self = this;
    self.__id = WebSocket.__nextId++;
    WebSocket.__instances[self.__id] = self;
    self.readyState = WebSocket.CONNECTING;
    self.bufferedAmount = 0;
    self.__events = {};
    if (!protocols) {
      protocols = [];
    } else if (typeof protocols == "string") {
      protocols = [protocols];
    }
    // Uses setTimeout() to make sure __createFlash() runs after the caller sets ws.onopen etc.
    // Otherwise, when onopen fires immediately, onopen is called before it is set.
    self.__createTask = setTimeout(function() {
      WebSocket.__addTask(function() {
        self.__createTask = null;
        WebSocket.__flash.create(
          self.__id, url, protocols, proxyHost || null, proxyPort || 0, headers || null);
      });
    }, 0);
  };

  /**
   * Send data to the web socket.
   * @param {string} data  The data to send to the socket.
   * @return {boolean}  True for success, false for failure.
   */
  WebSocket.prototype.send = function(data) {
    if (this.readyState == WebSocket.CONNECTING) {
      throw "INVALID_STATE_ERR: Web Socket connection has not been established";
    }
    // We use encodeURIComponent() here, because FABridge doesn't work if
    // the argument includes some characters. We don't use escape() here
    // because of this:
    // https://developer.mozilla.org/en/Core_JavaScript_1.5_Guide/Functions#escape_and_unescape_Functions
    // But it looks decodeURIComponent(encodeURIComponent(s)) doesn't
    // preserve all Unicode characters either e.g. "\uffff" in Firefox.
    // Note by wtritch: Hopefully this will not be necessary using ExternalInterface.  Will require
    // additional testing.
    var result = WebSocket.__flash.send(this.__id, encodeURIComponent(data));
    if (result < 0) { // success
      return true;
    } else {
      this.bufferedAmount += result;
      return false;
    }
  };

  /**
   * Close this web socket gracefully.
   */
  WebSocket.prototype.close = function() {
    if (this.__createTask) {
      clearTimeout(this.__createTask);
      this.__createTask = null;
      this.readyState = WebSocket.CLOSED;
      return;
    }
    if (this.readyState == WebSocket.CLOSED || this.readyState == WebSocket.CLOSING) {
      return;
    }
    this.readyState = WebSocket.CLOSING;
    WebSocket.__flash.close(this.__id);
  };

  /**
   * Implementation of {@link <a href="http://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-registration">DOM 2 EventTarget Interface</a>}
   *
   * @param {string} type
   * @param {function} listener
   * @param {boolean} useCapture
   * @return void
   */
  WebSocket.prototype.addEventListener = function(type, listener, useCapture) {
    if (!(type in this.__events)) {
      this.__events[type] = [];
    }
    this.__events[type].push(listener);
  };

  /**
   * Implementation of {@link <a href="http://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-registration">DOM 2 EventTarget Interface</a>}
   *
   * @param {string} type
   * @param {function} listener
   * @param {boolean} useCapture
   * @return void
   */
  WebSocket.prototype.removeEventListener = function(type, listener, useCapture) {
    if (!(type in this.__events)) return;
    var events = this.__events[type];
    for (var i = events.length - 1; i >= 0; --i) {
      if (events[i] === listener) {
        events.splice(i, 1);
        break;
      }
    }
  };

  /**
   * Implementation of {@link <a href="http://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-registration">DOM 2 EventTarget Interface</a>}
   *
   * @param {Event} event
   * @return void
   */
  WebSocket.prototype.dispatchEvent = function(event) {
    var events = this.__events[event.type] || [];
    for (var i = 0; i < events.length; ++i) {
      events[i](event);
    }
    var handler = this["on" + event.type];
    if (handler) handler.apply(this, [event]);
  };

  /**
   * Handles an event from Flash.
   * @param {Object} flashEvent
   */
  WebSocket.prototype.__handleEvent = function(flashEvent) {

    if ("readyState" in flashEvent) {
      this.readyState = flashEvent.readyState;
    }
    if ("protocol" in flashEvent) {
      this.protocol = flashEvent.protocol;
    }

    var jsEvent;
    if (flashEvent.type == "open" || flashEvent.type == "error") {
      jsEvent = this.__createSimpleEvent(flashEvent.type);
    } else if (flashEvent.type == "close") {
      jsEvent = this.__createSimpleEvent("close");
      jsEvent.wasClean = flashEvent.wasClean ? true : false;
      jsEvent.code = flashEvent.code;
      jsEvent.reason = flashEvent.reason;
    } else if (flashEvent.type == "message") {
      var data = decodeURIComponent(flashEvent.message);
      jsEvent = this.__createMessageEvent("message", data);
    } else {
      throw "unknown event type: " + flashEvent.type;
    }

    this.dispatchEvent(jsEvent);

  };

  WebSocket.prototype.__createSimpleEvent = function(type) {
    if (document.createEvent && window.Event) {
      var event = document.createEvent("Event");
      event.initEvent(type, false, false);
      return event;
    } else {
      return {type: type, bubbles: false, cancelable: false};
    }
  };

  WebSocket.prototype.__createMessageEvent = function(type, data) {
    if (window.MessageEvent && typeof(MessageEvent) == "function" && !window.opera) {
      return new MessageEvent("message", {
        "view": window,
        "bubbles": false,
        "cancelable": false,
        "data": data
      });
    } else if (document.createEvent && window.MessageEvent && !window.opera) {
      var event = document.createEvent("MessageEvent");
      event.initMessageEvent("message", false, false, data, null, null, window, null);
      return event;
    } else {
      // Old IE and Opera, the latter one truncates the data parameter after any 0x00 bytes.
      return {type: type, data: data, bubbles: false, cancelable: false};
    }
  };

  /**
   * Define the WebSocket readyState enumeration.
   */
  WebSocket.CONNECTING = 0;
  WebSocket.OPEN = 1;
  WebSocket.CLOSING = 2;
  WebSocket.CLOSED = 3;

  // Field to check implementation of WebSocket.
  WebSocket.__isFlashImplementation = true;
  WebSocket.__initialized = false;
  WebSocket.__flash = null;
  WebSocket.__instances = {};
  WebSocket.__tasks = [];
  WebSocket.__nextId = 0;

  /**
   * Load a new flash security policy file.
   * @param {string} url
   */
  WebSocket.loadFlashPolicyFile = function(url){
    WebSocket.__addTask(function() {
      WebSocket.__flash.loadManualPolicyFile(url);
    });
  };

  /**
   * Loads WebSocketMain.swf and creates WebSocketMain object in Flash.
   */
  WebSocket.__initialize = function() {

    if (WebSocket.__initialized) return;
    WebSocket.__initialized = true;

    if (WebSocket.__swfLocation) {
      // For backword compatibility.
      window.WEB_SOCKET_SWF_LOCATION = WebSocket.__swfLocation;
    }
    if (!window.WEB_SOCKET_SWF_LOCATION) {
      logger.error("[WebSocket] set WEB_SOCKET_SWF_LOCATION to location of WebSocketMain.swf");
      return;
    }
    if (!window.WEB_SOCKET_SUPPRESS_CROSS_DOMAIN_SWF_ERROR &&
      !WEB_SOCKET_SWF_LOCATION.match(/(^|\/)WebSocketMainInsecure\.swf(\?.*)?$/) &&
      WEB_SOCKET_SWF_LOCATION.match(/^\w+:\/\/([^\/]+)/)) {
      var swfHost = RegExp.$1;
      if (location.host != swfHost) {
        logger.error(
          "[WebSocket] You must host HTML and WebSocketMain.swf in the same host " +
            "('" + location.host + "' != '" + swfHost + "'). " +
            "See also 'How to host HTML file and SWF file in different domains' section " +
            "in README.md. If you use WebSocketMainInsecure.swf, you can suppress this message " +
            "by WEB_SOCKET_SUPPRESS_CROSS_DOMAIN_SWF_ERROR = true;");
      }
    }
    var container = document.createElement("div");
    container.id = "webSocketContainer";
    // Hides Flash box. We cannot use display: none or visibility: hidden because it prevents
    // Flash from loading at least in IE. So we move it out of the screen at (-100, -100).
    // But this even doesn't work with Flash Lite (e.g. in Droid Incredible). So with Flash
    // Lite, we put it at (0, 0). This shows 1x1 box visible at left-top corner but this is
    // the best we can do as far as we know now.
    container.style.position = "absolute";
    if (WebSocket.__isFlashLite()) {
      container.style.left = "0px";
      container.style.top = "0px";
    } else {
      container.style.left = "-100px";
      container.style.top = "-100px";
    }
    var holder = document.createElement("div");
    holder.id = "webSocketFlash";
    container.appendChild(holder);
    document.body.appendChild(container);
    // See this article for hasPriority:
    // http://help.adobe.com/en_US/as3/mobile/WS4bebcd66a74275c36cfb8137124318eebc6-7ffd.html
    swfobject.embedSWF(
      WEB_SOCKET_SWF_LOCATION,
      "webSocketFlash",
      "1" /* width */,
      "1" /* height */,
      "10.0.0" /* SWF version */,
      null,
      null,
      {hasPriority: true, swliveconnect : true, allowScriptAccess: "always"},
      null,
      function(e) {
        if (!e.success) {
          logger.error("[WebSocket] swfobject.embedSWF failed");
        }
      }
    );

  };

  /**
   * Called by Flash to notify JS that it's fully loaded and ready
   * for communication.
   */
  WebSocket.__onFlashInitialized = function() {
    // We need to set a timeout here to avoid round-trip calls
    // to flash during the initialization process.
    setTimeout(function() {
      WebSocket.__flash = document.getElementById("webSocketFlash");
      WebSocket.__flash.setCallerUrl(location.href);
      WebSocket.__flash.setDebug(!!window.WEB_SOCKET_DEBUG);
      for (var i = 0; i < WebSocket.__tasks.length; ++i) {
        WebSocket.__tasks[i]();
      }
      WebSocket.__tasks = [];
    }, 0);
  };

  /**
   * Called by Flash to notify WebSockets events are fired.
   */
  WebSocket.__onFlashEvent = function() {
    setTimeout(function() {
      try {
        // Gets events using receiveEvents() instead of getting it from event object
        // of Flash event. This is to make sure to keep message order.
        // It seems sometimes Flash events don't arrive in the same order as they are sent.
        var events = WebSocket.__flash.receiveEvents();
        for (var i = 0; i < events.length; ++i) {
          WebSocket.__instances[events[i].webSocketId].__handleEvent(events[i]);
        }
      } catch (e) {
        logger.error(e);
      }
    }, 0);
    return true;
  };

  // Called by Flash.
  WebSocket.__log = function(message) {
    logger.log(decodeURIComponent(message));
  };

  // Called by Flash.
  WebSocket.__error = function(message) {
    logger.error(decodeURIComponent(message));
  };

  WebSocket.__addTask = function(task) {
    if (WebSocket.__flash) {
      task();
    } else {
      WebSocket.__tasks.push(task);
    }
  };

  /**
   * Test if the browser is running flash lite.
   * @return {boolean} True if flash lite is running, false otherwise.
   */
  WebSocket.__isFlashLite = function() {
    if (!window.navigator || !window.navigator.mimeTypes) {
      return false;
    }
    var mimeType = window.navigator.mimeTypes["application/x-shockwave-flash"];
    if (!mimeType || !mimeType.enabledPlugin || !mimeType.enabledPlugin.filename) {
      return false;
    }
    return mimeType.enabledPlugin.filename.match(/flashlite/i) ? true : false;
  };

  if (!window.WEB_SOCKET_DISABLE_AUTO_INITIALIZATION) {
    // NOTE:
    //   This fires immediately if web_socket.js is dynamically loaded after
    //   the document is loaded.
    swfobject.addDomLoadEvent(function() {
      WebSocket.__initialize();
    });
  }

})();

FLASH_WEBSOCKET_LOADED = 1;