src/main/resources/guacamole.js

   1
   2 /*
   3  *  Guacamole - Clientless Remote Desktop
   4  *  Copyright (C) 2010  Michael Jumper
   5  *
   6  *  This program is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU Affero General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU Affero General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU Affero General Public License
  17  */
  18
  19 function GuacamoleClient(display, tunnel) {
  20
  21     var STATE_IDLE          = 0;
  22     var STATE_CONNECTING    = 1;
  23     var STATE_WAITING       = 2;
  24     var STATE_CONNECTED     = 3;
  25     var STATE_DISCONNECTING = 4;
  26     var STATE_DISCONNECTED  = 5;
  27
  28     var currentState = STATE_IDLE;
  29     var stateChangeHandler = null;
  30
  31     tunnel.setInstructionHandler(doInstruction);
  32
  33     // Display must be relatively positioned for mouse to be handled properly
  34     display.style.position = "relative";
  35
  36     function setState(state) {
  37         if (state != currentState) {
  38             currentState = state;
  39             if (stateChangeHandler)
  40                 stateChangeHandler(currentState);
  41         }
  42     }
  43
  44     this.setOnStateChangeHandler = function(handler) {
  45         stateChangeHandler = handler;
  46     };
  47
  48     function isConnected() {
  49         return currentState == STATE_CONNECTED
  50             || currentState == STATE_WAITING;
  51     }
  52
  53     var cursorImage = null;
  54     var cursorHotspotX = 0;
  55     var cursorHotspotY = 0;
  56
  57     // FIXME: Make object. Clean up.
  58     var cursorRectX = 0;
  59     var cursorRectY = 0;
  60     var cursorRectW = 0;
  61     var cursorRectH = 0;
  62
  63     var cursorHidden = 0;
  64
  65     function redrawCursor(x, y) {
  66
  67         // Hide hardware cursor
  68         if (cursorHidden == 0) {
  69             display.className += " guac-hide-cursor";
  70             cursorHidden = 1;
  71         }
  72
  73         // Erase old cursor
  74         cursor.clearRect(cursorRectX, cursorRectY, cursorRectW, cursorRectH);
  75
  76         // Update rect
  77         cursorRectX = x - cursorHotspotX;
  78         cursorRectY = y - cursorHotspotY;
  79         cursorRectW = cursorImage.width;
  80         cursorRectH = cursorImage.height;
  81
  82         // Draw new cursor
  83         cursor.drawImage(cursorRectX, cursorRectY, cursorImage);
  84     }
  85
  86     this.sendKeyEvent = function(pressed, keysym) {
  87         // Do not send requests if not connected
  88         if (!isConnected())
  89             return;
  90
  91         tunnel.sendMessage("key:" +  keysym + "," + pressed + ";");
  92     };
  93
  94     this.sendMouseState = function(mouseState) {
  95
  96         // Do not send requests if not connected
  97         if (!isConnected())
  98             return;
  99
 100         // Draw client-side cursor
 101         if (cursorImage != null) {
 102             redrawCursor(
 103                 mouseState.getX(),
 104                 mouseState.getY()
 105             );
 106         }
 107
 108         // Build mask
 109         var buttonMask = 0;
 110         if (mouseState.getLeft())   buttonMask |= 1;
 111         if (mouseState.getMiddle()) buttonMask |= 2;
 112         if (mouseState.getRight())  buttonMask |= 4;
 113         if (mouseState.getUp())     buttonMask |= 8;
 114         if (mouseState.getDown())   buttonMask |= 16;
 115
 116         // Send message
 117         tunnel.sendMessage("mouse:" + mouseState.getX() + "," + mouseState.getY() + "," + buttonMask + ";");
 118     };
 119
 120     this.setClipboard = function(data) {
 121
 122         // Do not send requests if not connected
 123         if (!isConnected())
 124             return;
 125
 126         tunnel.sendMessage("clipboard:" + escapeGuacamoleString(data) + ";");
 127     };
 128
 129     // Handlers
 130
 131     var nameHandler = null;
 132     this.setNameHandler = function(handler) {
 133         nameHandler = handler;
 134     }
 135
 136     var errorHandler = null;
 137     this.setErrorHandler = function(handler) {
 138         errorHandler = handler;
 139     };
 140
 141     var clipboardHandler = null;
 142     this.setClipboardHandler = function(handler) {
 143         clipboardHandler = handler;
 144     };
 145
 146     // Layers
 147     var displayWidth = 0;
 148     var displayHeight = 0;
 149
 150     var layers = new Array();
 151     var buffers = new Array();
 152     var cursor = null;
 153
 154     this.getLayers = function() {
 155         return layers;
 156     };
 157
 158     function getLayer(index) {
 159
 160         // If negative index, use buffer
 161         if (index < 0) {
 162
 163             index = -1 - index;
 164             var buffer = buffers[index];
 165
 166             // Create buffer if necessary
 167             if (buffer == null) {
 168                 buffer = new Layer(0, 0);
 169                 buffer.setAutosize(1);
 170                 buffers[index] = buffer;
 171             }
 172
 173             return buffer;
 174         }
 175
 176         // If non-negative, use visible layer
 177         else {
 178
 179             var layer = layers[index];
 180             if (layer == null) {
 181
 182                 // Add new layer
 183                 layer = new Layer(displayWidth, displayHeight);
 184                 layers[index] = layer;
 185
 186                 // (Re)-add existing layers in order
 187                 for (var i=0; i<layers.length; i++) {
 188                     if (layers[i]) {
 189
 190                         // If already present, remove
 191                         if (layers[i].parentNode === display)
 192                             display.removeChild(layers[i]);
 193
 194                         // Add to end
 195                         display.appendChild(layers[i]);
 196                     }
 197                 }
 198
 199                 // Add cursor layer last
 200                 if (cursor != null) {
 201                     if (cursor.parentNode === display)
 202                         display.removeChild(cursor);
 203                     display.appendChild(cursor);
 204                 }
 205
 206             }
 207             else {
 208                 // Reset size
 209                 layer.resize(displayWidth, displayHeight);
 210             }
 211
 212             return layer;
 213         }
 214
 215     }
 216
 217     var instructionHandlers = {
 218
 219         "error": function(parameters) {
 220             if (errorHandler) errorHandler(unescapeGuacamoleString(parameters[0]));
 221             disconnect();
 222         },
 223
 224         "name": function(parameters) {
 225             if (nameHandler) nameHandler(unescapeGuacamoleString(parameters[0]));
 226         },
 227
 228         "clipboard": function(parameters) {
 229             if (clipboardHandler) clipboardHandler(unescapeGuacamoleString(parameters[0]));
 230         },
 231
 232         "size": function(parameters) {
 233
 234             displayWidth = parseInt(parameters[0]);
 235             displayHeight = parseInt(parameters[1]);
 236
 237             // Update (set) display size
 238             display.style.width = displayWidth + "px";
 239             display.style.height = displayHeight + "px";
 240
 241             // Set cursor layer width/height
 242             if (cursor != null)
 243                 cursor.resize(displayWidth, displayHeight);
 244
 245         },
 246
 247         "png": function(parameters) {
 248
 249             var channelMask = parseInt(parameters[0]);
 250             var layer = getLayer(parseInt(parameters[1]));
 251             var x = parseInt(parameters[2]);
 252             var y = parseInt(parameters[3]);
 253             var data = parameters[4];
 254
 255             layer.setChannelMask(channelMask);
 256
 257             layer.draw(
 258                 x,
 259                 y,
 260                 "data:image/png;base64," + data
 261             );
 262
 263             // If received first update, no longer waiting.
 264             if (currentState == STATE_WAITING)
 265                 setState(STATE_CONNECTED);
 266
 267         },
 268
 269         "copy": function(parameters) {
 270
 271             var srcL = getLayer(parseInt(parameters[0]));
 272             var srcX = parseInt(parameters[1]);
 273             var srcY = parseInt(parameters[2]);
 274             var srcWidth = parseInt(parameters[3]);
 275             var srcHeight = parseInt(parameters[4]);
 276             var channelMask = parseInt(parameters[5]);
 277             var dstL = getLayer(parseInt(parameters[6]));
 278             var dstX = parseInt(parameters[7]);
 279             var dstY = parseInt(parameters[8]);
 280
 281             dstL.setChannelMask(channelMask);
 282
 283             dstL.copyRect(
 284                 srcL,
 285                 srcX,
 286                 srcY,
 287                 srcWidth,
 288                 srcHeight,
 289                 dstX,
 290                 dstY
 291             );
 292
 293         },
 294
 295         "cursor": function(parameters) {
 296
 297             var x = parseInt(parameters[0]);
 298             var y = parseInt(parameters[1]);
 299             var data = parameters[2];
 300
 301             if (cursor == null) {
 302                 cursor = new Layer(displayWidth, displayHeight);
 303                 display.appendChild(cursor);
 304             }
 305
 306             // Start cursor image load
 307             var image = new Image();
 308             image.onload = function() {
 309                 cursorImage = image;
 310                 cursorHotspotX = x;
 311                 cursorHotspotY = y;
 312                 redrawCursor(
 313                     cursorRectX + cursorHotspotX,
 314                     cursorRectY + cursorHotspotY
 315                 );
 316             };
 317             image.src = "data:image/png;base64," + data
 318
 319         },
 320
 321         "sync": function(parameters) {
 322
 323             var timestamp = parameters[0];
 324
 325             // When all layers have finished rendering all instructions
 326             // UP TO THIS POINT IN TIME, send sync response.
 327
 328             var layersToSync = 0;
 329             function syncLayer() {
 330
 331                 layersToSync--;
 332
 333                 // Send sync response when layers are finished
 334                 if (layersToSync == 0)
 335                     tunnel.sendMessage("sync:" + timestamp + ";");
 336
 337             }
 338
 339             // Count active, not-ready layers and install sync tracking hooks
 340             for (var i=0; i<layers.length; i++) {
 341
 342                 var layer = layers[i];
 343                 if (layer && !layer.isReady()) {
 344                     layersToSync++;
 345                     layer.sync(syncLayer);
 346                 }
 347
 348             }
 349
 350             // If all layers are ready, then we didn't install any hooks.
 351             // Send sync message now,
 352             if (layersToSync == 0)
 353                 tunnel.sendMessage("sync:" + timestamp + ";");
 354
 355         },
 356
 357     };
 358
 359
 360     function doInstruction(opcode, parameters) {
 361
 362         var handler = instructionHandlers[opcode];
 363         if (handler)
 364             handler(parameters);
 365
 366     }
 367
 368
 369     function disconnect() {
 370
 371         // Only attempt disconnection not disconnected.
 372         if (currentState != STATE_DISCONNECTED
 373                 && currentState != STATE_DISCONNECTING) {
 374
 375             setState(STATE_DISCONNECTING);
 376             tunnel.sendMessage("disconnect;");
 377             tunnel.disconnect();
 378             setState(STATE_DISCONNECTED);
 379         }
 380
 381     }
 382
 383     function escapeGuacamoleString(str) {
 384
 385         var escapedString = "";
 386
 387         for (var i=0; i<str.length; i++) {
 388
 389             var c = str.charAt(i);
 390             if (c == ",")
 391                 escapedString += "\\c";
 392             else if (c == ";")
 393                 escapedString += "\\s";
 394             else if (c == "\\")
 395                 escapedString += "\\\\";
 396             else
 397                 escapedString += c;
 398
 399         }
 400
 401         return escapedString;
 402
 403     }
 404
 405     function unescapeGuacamoleString(str) {
 406
 407         var unescapedString = "";
 408
 409         for (var i=0; i<str.length; i++) {
 410
 411             var c = str.charAt(i);
 412             if (c == "\\" && i<str.length-1) {
 413
 414                 var escapeChar = str.charAt(++i);
 415                 if (escapeChar == "c")
 416                     unescapedString += ",";
 417                 else if (escapeChar == "s")
 418                     unescapedString += ";";
 419                 else if (escapeChar == "\\")
 420                     unescapedString += "\\";
 421                 else
 422                     unescapedString += "\\" + escapeChar;
 423
 424             }
 425             else
 426                 unescapedString += c;
 427
 428         }
 429
 430         return unescapedString;
 431
 432     }
 433
 434     this.disconnect = disconnect;
 435     this.connect = function(data) {
 436
 437         setState(STATE_CONNECTING);
 438
 439         try {
 440             tunnel.connect(data);
 441         }
 442         catch (e) {
 443             setState(STATE_IDLE);
 444             throw e;
 445         }
 446
 447         setState(STATE_WAITING);
 448     };
 449
 450     this.escapeGuacamoleString   = escapeGuacamoleString;
 451     this.unescapeGuacamoleString = unescapeGuacamoleString;
 452
 453 }