mirror of
https://github.com/gyurix1968/guacamole-client.git
synced 2025-09-07 21:51:23 +00:00
488 lines
14 KiB
JavaScript
488 lines
14 KiB
JavaScript
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is guacamole-common-js.
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*
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* The Initial Developer of the Original Code is
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* Michael Jumper.
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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// Guacamole namespace
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var Guacamole = Guacamole || {};
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/**
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* Guacamole protocol client. Given a display element and {@link Guacamole.Tunnel},
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* automatically handles incoming and outgoing Guacamole instructions via the
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* provided tunnel, updating the display using one or more canvas elements.
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*
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* @constructor
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* @param {Element} display The display element to add canvas elements to.
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* @param {Guacamole.Tunnel} tunnel The tunnel to use to send and receive
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* Guacamole instructions.
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*/
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Guacamole.Client = function(display, tunnel) {
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var guac_client = this;
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var STATE_IDLE = 0;
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var STATE_CONNECTING = 1;
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var STATE_WAITING = 2;
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var STATE_CONNECTED = 3;
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var STATE_DISCONNECTING = 4;
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var STATE_DISCONNECTED = 5;
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var currentState = STATE_IDLE;
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var currentTimestamp = 0;
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var pingInterval = null;
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tunnel.onerror = function(message) {
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if (guac_client.onerror)
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guac_client.onerror(message);
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};
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// Display must be relatively positioned for mouse to be handled properly
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display.style.position = "relative";
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function setState(state) {
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if (state != currentState) {
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currentState = state;
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if (guac_client.onstatechange)
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guac_client.onstatechange(currentState);
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}
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}
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function isConnected() {
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return currentState == STATE_CONNECTED
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|| currentState == STATE_WAITING;
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}
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var cursorImage = null;
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var cursorHotspotX = 0;
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var cursorHotspotY = 0;
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var cursorRectX = 0;
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var cursorRectY = 0;
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var cursorRectW = 0;
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var cursorRectH = 0;
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var cursorHidden = 0;
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function redrawCursor(x, y) {
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// Hide hardware cursor
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if (cursorHidden == 0) {
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display.className += " guac-hide-cursor";
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cursorHidden = 1;
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}
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// Erase old cursor
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cursor.clearRect(cursorRectX, cursorRectY, cursorRectW, cursorRectH);
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// Update rect
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cursorRectX = x - cursorHotspotX;
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cursorRectY = y - cursorHotspotY;
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cursorRectW = cursorImage.width;
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cursorRectH = cursorImage.height;
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// Draw new cursor
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cursor.drawImage(cursorRectX, cursorRectY, cursorImage);
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}
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guac_client.sendKeyEvent = function(pressed, keysym) {
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// Do not send requests if not connected
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if (!isConnected())
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return;
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tunnel.sendMessage("key", keysym, pressed);
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};
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guac_client.sendMouseState = function(mouseState) {
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// Do not send requests if not connected
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if (!isConnected())
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return;
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// Draw client-side cursor
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if (cursorImage != null) {
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redrawCursor(
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mouseState.x,
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mouseState.y
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);
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}
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// Build mask
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var buttonMask = 0;
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if (mouseState.left) buttonMask |= 1;
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if (mouseState.middle) buttonMask |= 2;
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if (mouseState.right) buttonMask |= 4;
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if (mouseState.up) buttonMask |= 8;
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if (mouseState.down) buttonMask |= 16;
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// Send message
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tunnel.sendMessage("mouse", mouseState.x, mouseState.y, buttonMask);
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};
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guac_client.setClipboard = function(data) {
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// Do not send requests if not connected
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if (!isConnected())
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return;
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tunnel.sendMessage("clipboard", data);
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};
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// Handlers
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guac_client.onstatechange = null;
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guac_client.onname = null;
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guac_client.onerror = null;
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guac_client.onclipboard = null;
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// Layers
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var displayWidth = 0;
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var displayHeight = 0;
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var layers = new Array();
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var buffers = new Array();
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var cursor = null;
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guac_client.getLayers = function() {
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return layers;
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};
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function getLayer(index) {
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// If negative index, use buffer
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if (index < 0) {
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index = -1 - index;
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var buffer = buffers[index];
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// Create buffer if necessary
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if (buffer == null) {
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buffer = new Guacamole.Layer(0, 0);
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buffer.autosize = 1;
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buffers[index] = buffer;
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}
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return buffer;
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}
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// If non-negative, use visible layer
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else {
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var layer = layers[index];
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if (layer == null) {
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// Add new layer
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layer = new Guacamole.Layer(displayWidth, displayHeight);
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// Set layer position
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var canvas = layer.getCanvas();
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canvas.style.position = "absolute";
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canvas.style.left = "0px";
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canvas.style.top = "0px";
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layers[index] = layer;
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// (Re)-add existing layers in order
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for (var i=0; i<layers.length; i++) {
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if (layers[i]) {
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// If already present, remove
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if (layers[i].parentNode === display)
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display.removeChild(layers[i].getCanvas());
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// Add to end
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display.appendChild(layers[i].getCanvas());
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}
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}
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// Add cursor layer last
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if (cursor != null) {
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if (cursor.parentNode === display)
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display.removeChild(cursor.getCanvas());
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display.appendChild(cursor.getCanvas());
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}
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}
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else {
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// Reset size
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layer.resize(displayWidth, displayHeight);
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}
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return layer;
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}
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}
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var instructionHandlers = {
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"error": function(parameters) {
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if (guac_client.onerror) guac_client.onerror(parameters[0]);
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guac_client.disconnect();
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},
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"name": function(parameters) {
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if (guac_client.onname) guac_client.onname(parameters[0]);
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},
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"clipboard": function(parameters) {
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if (guac_client.onclipboard) guac_client.onclipboard(parameters[0]);
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},
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"size": function(parameters) {
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displayWidth = parseInt(parameters[0]);
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displayHeight = parseInt(parameters[1]);
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// Update (set) display size
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display.style.width = displayWidth + "px";
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display.style.height = displayHeight + "px";
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// Set cursor layer width/height
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if (cursor != null)
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cursor.resize(displayWidth, displayHeight);
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},
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"png": function(parameters) {
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var channelMask = parseInt(parameters[0]);
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var layer = getLayer(parseInt(parameters[1]));
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var x = parseInt(parameters[2]);
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var y = parseInt(parameters[3]);
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var data = parameters[4];
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layer.setChannelMask(channelMask);
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layer.draw(
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x,
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y,
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"data:image/png;base64," + data
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);
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// If received first update, no longer waiting.
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if (currentState == STATE_WAITING)
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setState(STATE_CONNECTED);
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},
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"copy": function(parameters) {
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var srcL = getLayer(parseInt(parameters[0]));
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var srcX = parseInt(parameters[1]);
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var srcY = parseInt(parameters[2]);
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var srcWidth = parseInt(parameters[3]);
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var srcHeight = parseInt(parameters[4]);
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var channelMask = parseInt(parameters[5]);
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var dstL = getLayer(parseInt(parameters[6]));
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var dstX = parseInt(parameters[7]);
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var dstY = parseInt(parameters[8]);
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dstL.setChannelMask(channelMask);
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dstL.copyRect(
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srcL,
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srcX,
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srcY,
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srcWidth,
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srcHeight,
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dstX,
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dstY
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);
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},
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"rect": function(parameters) {
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var channelMask = parseInt(parameters[0]);
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var layer = getLayer(parseInt(parameters[1]));
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var x = parseInt(parameters[2]);
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var y = parseInt(parameters[3]);
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var w = parseInt(parameters[4]);
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var h = parseInt(parameters[5]);
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var r = parseInt(parameters[6]);
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var g = parseInt(parameters[7]);
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var b = parseInt(parameters[8]);
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var a = parseInt(parameters[9]);
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layer.setChannelMask(channelMask);
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layer.drawRect(
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x, y, w, h,
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r, g, b, a
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);
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},
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"clip": function(parameters) {
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var layer = getLayer(parseInt(parameters[0]));
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var x = parseInt(parameters[1]);
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var y = parseInt(parameters[2]);
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var w = parseInt(parameters[3]);
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var h = parseInt(parameters[4]);
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layer.clipRect(x, y, w, h);
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},
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"cursor": function(parameters) {
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var x = parseInt(parameters[0]);
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var y = parseInt(parameters[1]);
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var data = parameters[2];
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if (cursor == null) {
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cursor = new Guacamole.Layer(displayWidth, displayHeight);
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var canvas = cursor.getCanvas();
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canvas.style.position = "absolute";
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canvas.style.left = "0px";
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canvas.style.top = "0px";
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display.appendChild(canvas);
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}
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// Start cursor image load
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var image = new Image();
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image.onload = function() {
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cursorImage = image;
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var cursorX = cursorRectX + cursorHotspotX;
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var cursorY = cursorRectY + cursorHotspotY;
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cursorHotspotX = x;
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cursorHotspotY = y;
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redrawCursor(cursorX, cursorY);
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};
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image.src = "data:image/png;base64," + data
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},
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"sync": function(parameters) {
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var timestamp = parameters[0];
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// When all layers have finished rendering all instructions
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// UP TO THIS POINT IN TIME, send sync response.
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var layersToSync = 0;
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function syncLayer() {
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layersToSync--;
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// Send sync response when layers are finished
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if (layersToSync == 0) {
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tunnel.sendMessage("sync", timestamp);
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currentTimestamp = timestamp;
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}
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}
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// Count active, not-ready layers and install sync tracking hooks
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for (var i=0; i<layers.length; i++) {
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var layer = layers[i];
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if (layer && !layer.isReady()) {
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layersToSync++;
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layer.sync(syncLayer);
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}
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}
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// If all layers are ready, then we didn't install any hooks.
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// Send sync message now,
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if (layersToSync == 0) {
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tunnel.sendMessage("sync", timestamp);
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currentTimestamp = timestamp;
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}
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}
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};
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tunnel.oninstruction = function(opcode, parameters) {
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var handler = instructionHandlers[opcode];
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if (handler)
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handler(parameters);
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};
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guac_client.disconnect = function() {
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// Only attempt disconnection not disconnected.
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if (currentState != STATE_DISCONNECTED
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&& currentState != STATE_DISCONNECTING) {
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setState(STATE_DISCONNECTING);
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// Stop ping
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if (pingInterval)
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window.clearInterval(pingInterval);
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// Send disconnect message and disconnect
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tunnel.sendMessage("disconnect");
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tunnel.disconnect();
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setState(STATE_DISCONNECTED);
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}
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};
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guac_client.connect = function(data) {
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setState(STATE_CONNECTING);
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try {
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tunnel.connect(data);
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}
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catch (e) {
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setState(STATE_IDLE);
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throw e;
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}
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// Ping every 5 seconds (ensure connection alive)
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pingInterval = window.setInterval(function() {
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tunnel.sendMessage("sync", currentTimestamp);
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}, 5000);
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setState(STATE_WAITING);
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};
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};
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