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<h1 class="page-title">Source: main/webapp/modules/Tunnel.js</h1>
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<pre class="prettyprint source linenums"><code>/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
var Guacamole = Guacamole || {};
/**
* Core object providing abstract communication for Guacamole. This object
* is a null implementation whose functions do nothing. Guacamole applications
* should use {@link Guacamole.HTTPTunnel} instead, or implement their own tunnel based
* on this one.
*
* @constructor
* @see Guacamole.HTTPTunnel
*/
Guacamole.Tunnel = function() {
/**
* Connect to the tunnel with the given optional data. This data is
* typically used for authentication. The format of data accepted is
* up to the tunnel implementation.
*
* @param {string} [data]
* The data to send to the tunnel when connecting.
*/
this.connect = function(data) {};
/**
* Disconnect from the tunnel.
*/
this.disconnect = function() {};
/**
* Send the given message through the tunnel to the service on the other
* side. All messages are guaranteed to be received in the order sent.
*
* @param {...*} elements
* The elements of the message to send to the service on the other side
* of the tunnel.
*/
this.sendMessage = function(elements) {};
/**
* Changes the stored numeric state of this tunnel, firing the onstatechange
* event if the new state is different and a handler has been defined.
*
* @private
* @param {!number} state
* The new state of this tunnel.
*/
this.setState = function(state) {
// Notify only if state changes
if (state !== this.state) {
this.state = state;
if (this.onstatechange)
this.onstatechange(state);
}
};
/**
* Changes the stored UUID that uniquely identifies this tunnel, firing the
* onuuid event if a handler has been defined.
*
* @private
* @param {string} uuid
* The new state of this tunnel.
*/
this.setUUID = function setUUID(uuid) {
this.uuid = uuid;
if (this.onuuid)
this.onuuid(uuid);
};
/**
* Returns whether this tunnel is currently connected.
*
* @returns {!boolean}
* true if this tunnel is currently connected, false otherwise.
*/
this.isConnected = function isConnected() {
return this.state === Guacamole.Tunnel.State.OPEN
|| this.state === Guacamole.Tunnel.State.UNSTABLE;
};
/**
* The current state of this tunnel.
*
* @type {!number}
*/
this.state = Guacamole.Tunnel.State.CLOSED;
/**
* The maximum amount of time to wait for data to be received, in
* milliseconds. If data is not received within this amount of time,
* the tunnel is closed with an error. The default value is 15000.
*
* @type {!number}
*/
this.receiveTimeout = 15000;
/**
* The amount of time to wait for data to be received before considering
* the connection to be unstable, in milliseconds. If data is not received
* within this amount of time, the tunnel status is updated to warn that
* the connection appears unresponsive and may close. The default value is
* 1500.
*
* @type {!number}
*/
this.unstableThreshold = 1500;
/**
* The UUID uniquely identifying this tunnel. If not yet known, this will
* be null.
*
* @type {string}
*/
this.uuid = null;
/**
* Fired when the UUID that uniquely identifies this tunnel is known.
*
* @event
* @param {!string}
* The UUID uniquely identifying this tunnel.
*/
this.onuuid = null;
/**
* Fired whenever an error is encountered by the tunnel.
*
* @event
* @param {!Guacamole.Status} status
* A status object which describes the error.
*/
this.onerror = null;
/**
* Fired whenever the state of the tunnel changes.
*
* @event
* @param {!number} state
* The new state of the client.
*/
this.onstatechange = null;
/**
* Fired once for every complete Guacamole instruction received, in order.
*
* @event
* @param {!string} opcode
* The Guacamole instruction opcode.
*
* @param {!string[]} parameters
* The parameters provided for the instruction, if any.
*/
this.oninstruction = null;
};
/**
* The Guacamole protocol instruction opcode reserved for arbitrary internal
* use by tunnel implementations. The value of this opcode is guaranteed to be
* the empty string (""). Tunnel implementations may use this opcode for any
* purpose. It is currently used by the HTTP tunnel to mark the end of the HTTP
* response, and by the WebSocket tunnel to transmit the tunnel UUID and send
* connection stability test pings/responses.
*
* @constant
* @type {!string}
*/
Guacamole.Tunnel.INTERNAL_DATA_OPCODE = '';
/**
* All possible tunnel states.
*
* @type {!Object.&lt;string, number>}
*/
Guacamole.Tunnel.State = {
/**
* A connection is in pending. It is not yet known whether connection was
* successful.
*
* @type {!number}
*/
"CONNECTING": 0,
/**
* Connection was successful, and data is being received.
*
* @type {!number}
*/
"OPEN": 1,
/**
* The connection is closed. Connection may not have been successful, the
* tunnel may have been explicitly closed by either side, or an error may
* have occurred.
*
* @type {!number}
*/
"CLOSED": 2,
/**
* The connection is open, but communication through the tunnel appears to
* be disrupted, and the connection may close as a result.
*
* @type {!number}
*/
"UNSTABLE" : 3
};
/**
* Guacamole Tunnel implemented over HTTP via XMLHttpRequest.
*
* @constructor
* @augments Guacamole.Tunnel
*
* @param {!string} tunnelURL
* The URL of the HTTP tunneling service.
*
* @param {boolean} [crossDomain=false]
* Whether tunnel requests will be cross-domain, and thus must use CORS
* mechanisms and headers. By default, it is assumed that tunnel requests
* will be made to the same domain.
*
* @param {object} [extraTunnelHeaders={}]
* Key value pairs containing the header names and values of any additional
* headers to be sent in tunnel requests. By default, no extra headers will
* be added.
*/
Guacamole.HTTPTunnel = function(tunnelURL, crossDomain, extraTunnelHeaders) {
/**
* Reference to this HTTP tunnel.
*
* @private
* @type {!Guacamole.HTTPTunnel}
*/
var tunnel = this;
var TUNNEL_CONNECT = tunnelURL + "?connect";
var TUNNEL_READ = tunnelURL + "?read:";
var TUNNEL_WRITE = tunnelURL + "?write:";
var POLLING_ENABLED = 1;
var POLLING_DISABLED = 0;
// Default to polling - will be turned off automatically if not needed
var pollingMode = POLLING_ENABLED;
var sendingMessages = false;
var outputMessageBuffer = "";
// If requests are expected to be cross-domain, the cookie that the HTTP
// tunnel depends on will only be sent if withCredentials is true
var withCredentials = !!crossDomain;
/**
* The current receive timeout ID, if any.
*
* @private
* @type {number}
*/
var receive_timeout = null;
/**
* The current connection stability timeout ID, if any.
*
* @private
* @type {number}
*/
var unstableTimeout = null;
/**
* The current connection stability test ping interval ID, if any. This
* will only be set upon successful connection.
*
* @private
* @type {number}
*/
var pingInterval = null;
/**
* The number of milliseconds to wait between connection stability test
* pings.
*
* @private
* @constant
* @type {!number}
*/
var PING_FREQUENCY = 500;
/**
* Additional headers to be sent in tunnel requests. This dictionary can be
* populated with key/value header pairs to pass information such as authentication
* tokens, etc.
*
* @private
* @type {!object}
*/
var extraHeaders = extraTunnelHeaders || {};
/**
* The name of the HTTP header containing the session token specific to the
* HTTP tunnel implementation.
*
* @private
* @constant
* @type {!string}
*/
var TUNNEL_TOKEN_HEADER = 'Guacamole-Tunnel-Token';
/**
* The session token currently assigned to this HTTP tunnel. All distinct
* HTTP tunnel connections will have their own dedicated session token.
*
* @private
* @type {string}
*/
var tunnelSessionToken = null;
/**
* Adds the configured additional headers to the given request.
*
* @private
* @param {!XMLHttpRequest} request
* The request where the configured extra headers will be added.
*
* @param {!object} headers
* The headers to be added to the request.
*/
function addExtraHeaders(request, headers) {
for (var name in headers) {
request.setRequestHeader(name, headers[name]);
}
}
/**
* Resets the state of timers tracking network activity and stability. If
* those timers are not yet started, invoking this function starts them.
* This function should be invoked when the tunnel is established and every
* time there is network activity on the tunnel, such that the timers can
* safely assume the network and/or server are not responding if this
* function has not been invoked for a significant period of time.
*
* @private
*/
var resetTimers = function resetTimers() {
// Get rid of old timeouts (if any)
window.clearTimeout(receive_timeout);
window.clearTimeout(unstableTimeout);
// Clear unstable status
if (tunnel.state === Guacamole.Tunnel.State.UNSTABLE)
tunnel.setState(Guacamole.Tunnel.State.OPEN);
// Set new timeout for tracking overall connection timeout
receive_timeout = window.setTimeout(function () {
close_tunnel(new Guacamole.Status(Guacamole.Status.Code.UPSTREAM_TIMEOUT, "Server timeout."));
}, tunnel.receiveTimeout);
// Set new timeout for tracking suspected connection instability
unstableTimeout = window.setTimeout(function() {
tunnel.setState(Guacamole.Tunnel.State.UNSTABLE);
}, tunnel.unstableThreshold);
};
/**
* Closes this tunnel, signaling the given status and corresponding
* message, which will be sent to the onerror handler if the status is
* an error status.
*
* @private
* @param {!Guacamole.Status} status
* The status causing the connection to close;
*/
function close_tunnel(status) {
// Get rid of old timeouts (if any)
window.clearTimeout(receive_timeout);
window.clearTimeout(unstableTimeout);
// Cease connection test pings
window.clearInterval(pingInterval);
// Ignore if already closed
if (tunnel.state === Guacamole.Tunnel.State.CLOSED)
return;
// If connection closed abnormally, signal error.
if (status.code !== Guacamole.Status.Code.SUCCESS &amp;&amp; tunnel.onerror) {
// Ignore RESOURCE_NOT_FOUND if we've already connected, as that
// only signals end-of-stream for the HTTP tunnel.
if (tunnel.state === Guacamole.Tunnel.State.CONNECTING
|| status.code !== Guacamole.Status.Code.RESOURCE_NOT_FOUND)
tunnel.onerror(status);
}
// Reset output message buffer
sendingMessages = false;
// Mark as closed
tunnel.setState(Guacamole.Tunnel.State.CLOSED);
}
this.sendMessage = function() {
// Do not attempt to send messages if not connected
if (!tunnel.isConnected())
return;
// Do not attempt to send empty messages
if (!arguments.length)
return;
// Add message to buffer
outputMessageBuffer += Guacamole.Parser.toInstruction(arguments);
// Send if not currently sending
if (!sendingMessages)
sendPendingMessages();
};
function sendPendingMessages() {
// Do not attempt to send messages if not connected
if (!tunnel.isConnected())
return;
if (outputMessageBuffer.length > 0) {
sendingMessages = true;
var message_xmlhttprequest = new XMLHttpRequest();
message_xmlhttprequest.open("POST", TUNNEL_WRITE + tunnel.uuid);
message_xmlhttprequest.withCredentials = withCredentials;
addExtraHeaders(message_xmlhttprequest, extraHeaders);
message_xmlhttprequest.setRequestHeader("Content-type", "application/octet-stream");
message_xmlhttprequest.setRequestHeader(TUNNEL_TOKEN_HEADER, tunnelSessionToken);
// Once response received, send next queued event.
message_xmlhttprequest.onreadystatechange = function() {
if (message_xmlhttprequest.readyState === 4) {
resetTimers();
// If an error occurs during send, handle it
if (message_xmlhttprequest.status !== 200)
handleHTTPTunnelError(message_xmlhttprequest);
// Otherwise, continue the send loop
else
sendPendingMessages();
}
};
message_xmlhttprequest.send(outputMessageBuffer);
outputMessageBuffer = ""; // Clear buffer
}
else
sendingMessages = false;
}
function handleHTTPTunnelError(xmlhttprequest) {
// Pull status code directly from headers provided by Guacamole
var code = parseInt(xmlhttprequest.getResponseHeader("Guacamole-Status-Code"));
if (code) {
var message = xmlhttprequest.getResponseHeader("Guacamole-Error-Message");
close_tunnel(new Guacamole.Status(code, message));
}
// Failing that, derive a Guacamole status code from the HTTP status
// code provided by the browser
else if (xmlhttprequest.status)
close_tunnel(new Guacamole.Status(
Guacamole.Status.Code.fromHTTPCode(xmlhttprequest.status),
xmlhttprequest.statusText));
// Otherwise, assume server is unreachable
else
close_tunnel(new Guacamole.Status(Guacamole.Status.Code.UPSTREAM_NOT_FOUND));
}
function handleResponse(xmlhttprequest) {
var interval = null;
var nextRequest = null;
var dataUpdateEvents = 0;
var parser = new Guacamole.Parser();
parser.oninstruction = function instructionReceived(opcode, args) {
// Switch to next request if end-of-stream is signalled
if (opcode === Guacamole.Tunnel.INTERNAL_DATA_OPCODE &amp;&amp; args.length === 0) {
// Reset parser state by simply switching to an entirely new
// parser
parser = new Guacamole.Parser();
parser.oninstruction = instructionReceived;
// Clean up interval if polling
if (interval)
clearInterval(interval);
// Clean up object
xmlhttprequest.onreadystatechange = null;
xmlhttprequest.abort();
// Start handling next request
if (nextRequest)
handleResponse(nextRequest);
}
// Call instruction handler.
else if (opcode !== Guacamole.Tunnel.INTERNAL_DATA_OPCODE &amp;&amp; tunnel.oninstruction)
tunnel.oninstruction(opcode, args);
};
function parseResponse() {
// Do not handle responses if not connected
if (!tunnel.isConnected()) {
// Clean up interval if polling
if (interval !== null)
clearInterval(interval);
return;
}
// Do not parse response yet if not ready
if (xmlhttprequest.readyState &lt; 2) return;
// Attempt to read status
var status;
try { status = xmlhttprequest.status; }
// If status could not be read, assume successful.
catch (e) { status = 200; }
// Start next request as soon as possible IF request was successful
if (!nextRequest &amp;&amp; status === 200)
nextRequest = makeRequest();
// Parse stream when data is received and when complete.
if (xmlhttprequest.readyState === 3 ||
xmlhttprequest.readyState === 4) {
resetTimers();
// Also poll every 30ms (some browsers don't repeatedly call onreadystatechange for new data)
if (pollingMode === POLLING_ENABLED) {
if (xmlhttprequest.readyState === 3 &amp;&amp; !interval)
interval = setInterval(parseResponse, 30);
else if (xmlhttprequest.readyState === 4 &amp;&amp; interval)
clearInterval(interval);
}
// If canceled, stop transfer
if (xmlhttprequest.status === 0) {
tunnel.disconnect();
return;
}
// Halt on error during request
else if (xmlhttprequest.status !== 200) {
handleHTTPTunnelError(xmlhttprequest);
return;
}
// Attempt to read in-progress data
var current;
try { current = xmlhttprequest.responseText; }
// Do not attempt to parse if data could not be read
catch (e) { return; }
try {
parser.receive(current, true);
}
catch (e) {
close_tunnel(new Guacamole.Status(Guacamole.Status.Code.SERVER_ERROR, e.message));
return;
}
}
}
// If response polling enabled, attempt to detect if still
// necessary (via wrapping parseResponse())
if (pollingMode === POLLING_ENABLED) {
xmlhttprequest.onreadystatechange = function() {
// If we receive two or more readyState==3 events,
// there is no need to poll.
if (xmlhttprequest.readyState === 3) {
dataUpdateEvents++;
if (dataUpdateEvents >= 2) {
pollingMode = POLLING_DISABLED;
xmlhttprequest.onreadystatechange = parseResponse;
}
}
parseResponse();
};
}
// Otherwise, just parse
else
xmlhttprequest.onreadystatechange = parseResponse;
parseResponse();
}
/**
* Arbitrary integer, unique for each tunnel read request.
* @private
*/
var request_id = 0;
function makeRequest() {
// Make request, increment request ID
var xmlhttprequest = new XMLHttpRequest();
xmlhttprequest.open("GET", TUNNEL_READ + tunnel.uuid + ":" + (request_id++));
xmlhttprequest.setRequestHeader(TUNNEL_TOKEN_HEADER, tunnelSessionToken);
xmlhttprequest.withCredentials = withCredentials;
addExtraHeaders(xmlhttprequest, extraHeaders);
xmlhttprequest.send(null);
return xmlhttprequest;
}
this.connect = function(data) {
// Start waiting for connect
resetTimers();
// Mark the tunnel as connecting
tunnel.setState(Guacamole.Tunnel.State.CONNECTING);
// Start tunnel and connect
var connect_xmlhttprequest = new XMLHttpRequest();
connect_xmlhttprequest.onreadystatechange = function() {
if (connect_xmlhttprequest.readyState !== 4)
return;
// If failure, throw error
if (connect_xmlhttprequest.status !== 200) {
handleHTTPTunnelError(connect_xmlhttprequest);
return;
}
resetTimers();
// Get UUID and HTTP-specific tunnel session token from response
tunnel.setUUID(connect_xmlhttprequest.responseText);
tunnelSessionToken = connect_xmlhttprequest.getResponseHeader(TUNNEL_TOKEN_HEADER);
// Fail connect attempt if token is not successfully assigned
if (!tunnelSessionToken) {
close_tunnel(new Guacamole.Status(Guacamole.Status.Code.UPSTREAM_NOT_FOUND));
return;
}
// Mark as open
tunnel.setState(Guacamole.Tunnel.State.OPEN);
// Ping tunnel endpoint regularly to test connection stability
pingInterval = setInterval(function sendPing() {
tunnel.sendMessage("nop");
}, PING_FREQUENCY);
// Start reading data
handleResponse(makeRequest());
};
connect_xmlhttprequest.open("POST", TUNNEL_CONNECT, true);
connect_xmlhttprequest.withCredentials = withCredentials;
addExtraHeaders(connect_xmlhttprequest, extraHeaders);
connect_xmlhttprequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded; charset=UTF-8");
connect_xmlhttprequest.send(data);
};
this.disconnect = function() {
close_tunnel(new Guacamole.Status(Guacamole.Status.Code.SUCCESS, "Manually closed."));
};
};
Guacamole.HTTPTunnel.prototype = new Guacamole.Tunnel();
/**
* Guacamole Tunnel implemented over WebSocket via XMLHttpRequest.
*
* @constructor
* @augments Guacamole.Tunnel
* @param {!string} tunnelURL
* The URL of the WebSocket tunneling service.
*/
Guacamole.WebSocketTunnel = function(tunnelURL) {
/**
* Reference to this WebSocket tunnel.
*
* @private
* @type {Guacamole.WebSocketTunnel}
*/
var tunnel = this;
/**
* The parser that this tunnel will use to parse received Guacamole
* instructions. The parser is created when the tunnel is (re-)connected.
* Initially, this will be null.
*
* @private
* @type {Guacamole.Parser}
*/
var parser = null;
/**
* The WebSocket used by this tunnel.
*
* @private
* @type {WebSocket}
*/
var socket = null;
/**
* The current receive timeout ID, if any.
*
* @private
* @type {number}
*/
var receive_timeout = null;
/**
* The current connection stability timeout ID, if any.
*
* @private
* @type {number}
*/
var unstableTimeout = null;
/**
* The current connection stability test ping timeout ID, if any. This
* will only be set upon successful connection.
*
* @private
* @type {number}
*/
var pingTimeout = null;
/**
* The WebSocket protocol corresponding to the protocol used for the current
* location.
*
* @private
* @type {!Object.&lt;string, string>}
*/
var ws_protocol = {
"http:": "ws:",
"https:": "wss:"
};
/**
* The number of milliseconds to wait between connection stability test
* pings.
*
* @private
* @constant
* @type {!number}
*/
var PING_FREQUENCY = 500;
/**
* The timestamp of the point in time that the last connection stability
* test ping was sent, in milliseconds elapsed since midnight of January 1,
* 1970 UTC.
*
* @private
* @type {!number}
*/
var lastSentPing = 0;
// Transform current URL to WebSocket URL
// If not already a websocket URL
if ( tunnelURL.substring(0, 3) !== "ws:"
&amp;&amp; tunnelURL.substring(0, 4) !== "wss:") {
var protocol = ws_protocol[window.location.protocol];
// If absolute URL, convert to absolute WS URL
if (tunnelURL.substring(0, 1) === "/")
tunnelURL =
protocol
+ "//" + window.location.host
+ tunnelURL;
// Otherwise, construct absolute from relative URL
else {
// Get path from pathname
var slash = window.location.pathname.lastIndexOf("/");
var path = window.location.pathname.substring(0, slash + 1);
// Construct absolute URL
tunnelURL =
protocol
+ "//" + window.location.host
+ path
+ tunnelURL;
}
}
/**
* Sends an internal "ping" instruction to the Guacamole WebSocket
* endpoint, verifying network connection stability. If the network is
* stable, the Guacamole server will receive this instruction and respond
* with an identical ping.
*
* @private
*/
var sendPing = function sendPing() {
var currentTime = new Date().getTime();
tunnel.sendMessage(Guacamole.Tunnel.INTERNAL_DATA_OPCODE, 'ping', currentTime);
lastSentPing = currentTime;
};
/**
* Resets the state of timers tracking network activity and stability. If
* those timers are not yet started, invoking this function starts them.
* This function should be invoked when the tunnel is established and every
* time there is network activity on the tunnel, such that the timers can
* safely assume the network and/or server are not responding if this
* function has not been invoked for a significant period of time.
*
* @private
*/
var resetTimers = function resetTimers() {
// Get rid of old timeouts (if any)
window.clearTimeout(receive_timeout);
window.clearTimeout(unstableTimeout);
window.clearTimeout(pingTimeout);
// Clear unstable status
if (tunnel.state === Guacamole.Tunnel.State.UNSTABLE)
tunnel.setState(Guacamole.Tunnel.State.OPEN);
// Set new timeout for tracking overall connection timeout
receive_timeout = window.setTimeout(function () {
close_tunnel(new Guacamole.Status(Guacamole.Status.Code.UPSTREAM_TIMEOUT, "Server timeout."));
}, tunnel.receiveTimeout);
// Set new timeout for tracking suspected connection instability
unstableTimeout = window.setTimeout(function() {
tunnel.setState(Guacamole.Tunnel.State.UNSTABLE);
}, tunnel.unstableThreshold);
var currentTime = new Date().getTime();
var pingDelay = Math.max(lastSentPing + PING_FREQUENCY - currentTime, 0);
// Ping tunnel endpoint regularly to test connection stability, sending
// the ping immediately if enough time has already elapsed
if (pingDelay > 0)
pingTimeout = window.setTimeout(sendPing, pingDelay);
else
sendPing();
};
/**
* Closes this tunnel, signaling the given status and corresponding
* message, which will be sent to the onerror handler if the status is
* an error status.
*
* @private
* @param {!Guacamole.Status} status
* The status causing the connection to close;
*/
function close_tunnel(status) {
// Get rid of old timeouts (if any)
window.clearTimeout(receive_timeout);
window.clearTimeout(unstableTimeout);
window.clearTimeout(pingTimeout);
// Ignore if already closed
if (tunnel.state === Guacamole.Tunnel.State.CLOSED)
return;
// If connection closed abnormally, signal error.
if (status.code !== Guacamole.Status.Code.SUCCESS &amp;&amp; tunnel.onerror)
tunnel.onerror(status);
// Mark as closed
tunnel.setState(Guacamole.Tunnel.State.CLOSED);
socket.close();
}
this.sendMessage = function(elements) {
// Do not attempt to send messages if not connected
if (!tunnel.isConnected())
return;
// Do not attempt to send empty messages
if (!arguments.length)
return;
socket.send(Guacamole.Parser.toInstruction(arguments));
};
this.connect = function(data) {
resetTimers();
// Mark the tunnel as connecting
tunnel.setState(Guacamole.Tunnel.State.CONNECTING);
parser = new Guacamole.Parser();
parser.oninstruction = function instructionReceived(opcode, args) {
// Update state and UUID when first instruction received
if (tunnel.uuid === null) {
// Associate tunnel UUID if received
if (opcode === Guacamole.Tunnel.INTERNAL_DATA_OPCODE &amp;&amp; args.length === 1)
tunnel.setUUID(args[0]);
// Tunnel is now open and UUID is available
tunnel.setState(Guacamole.Tunnel.State.OPEN);
}
// Call instruction handler.
if (opcode !== Guacamole.Tunnel.INTERNAL_DATA_OPCODE &amp;&amp; tunnel.oninstruction)
tunnel.oninstruction(opcode, args);
};
// Connect socket
socket = new WebSocket(tunnelURL + "?" + data, "guacamole");
socket.onopen = function(event) {
resetTimers();
};
socket.onclose = function(event) {
// Pull status code directly from closure reason provided by Guacamole
if (event.reason)
close_tunnel(new Guacamole.Status(parseInt(event.reason), event.reason));
// Failing that, derive a Guacamole status code from the WebSocket
// status code provided by the browser
else if (event.code)
close_tunnel(new Guacamole.Status(Guacamole.Status.Code.fromWebSocketCode(event.code)));
// Otherwise, assume server is unreachable
else
close_tunnel(new Guacamole.Status(Guacamole.Status.Code.UPSTREAM_NOT_FOUND));
};
socket.onmessage = function(event) {
resetTimers();
try {
parser.receive(event.data);
}
catch (e) {
close_tunnel(new Guacamole.Status(Guacamole.Status.Code.SERVER_ERROR, e.message));
}
};
};
this.disconnect = function() {
close_tunnel(new Guacamole.Status(Guacamole.Status.Code.SUCCESS, "Manually closed."));
};
};
Guacamole.WebSocketTunnel.prototype = new Guacamole.Tunnel();
/**
* Guacamole Tunnel which cycles between all specified tunnels until
* no tunnels are left. Another tunnel is used if an error occurs but
* no instructions have been received. If an instruction has been
* received, or no tunnels remain, the error is passed directly out
* through the onerror handler (if defined).
*
* @constructor
* @augments Guacamole.Tunnel
* @param {...Guacamole.Tunnel} tunnelChain
* The tunnels to use, in order of priority.
*/
Guacamole.ChainedTunnel = function(tunnelChain) {
/**
* Reference to this chained tunnel.
* @private
*/
var chained_tunnel = this;
/**
* Data passed in via connect(), to be used for
* wrapped calls to other tunnels' connect() functions.
* @private
*/
var connect_data;
/**
* Array of all tunnels passed to this ChainedTunnel through the
* constructor arguments.
* @private
*/
var tunnels = [];
/**
* The tunnel committed via commit_tunnel(), if any, or null if no tunnel
* has yet been committed.
*
* @private
* @type {Guacamole.Tunnel}
*/
var committedTunnel = null;
// Load all tunnels into array
for (var i=0; i&lt;arguments.length; i++)
tunnels.push(arguments[i]);
/**
* Sets the current tunnel.
*
* @private
* @param {!Guacamole.Tunnel} tunnel
* The tunnel to set as the current tunnel.
*/
function attach(tunnel) {
// Set own functions to tunnel's functions
chained_tunnel.disconnect = tunnel.disconnect;
chained_tunnel.sendMessage = tunnel.sendMessage;
/**
* Fails the currently-attached tunnel, attaching a new tunnel if
* possible.
*
* @private
* @param {Guacamole.Status} [status]
* An object representing the failure that occured in the
* currently-attached tunnel, if known.
*
* @return {Guacamole.Tunnel}
* The next tunnel, or null if there are no more tunnels to try or
* if no more tunnels should be tried.
*/
var failTunnel = function failTunnel(status) {
// Do not attempt to continue using next tunnel on server timeout
if (status &amp;&amp; status.code === Guacamole.Status.Code.UPSTREAM_TIMEOUT) {
tunnels = [];
return null;
}
// Get next tunnel
var next_tunnel = tunnels.shift();
// If there IS a next tunnel, try using it.
if (next_tunnel) {
tunnel.onerror = null;
tunnel.oninstruction = null;
tunnel.onstatechange = null;
attach(next_tunnel);
}
return next_tunnel;
};
/**
* Use the current tunnel from this point forward. Do not try any more
* tunnels, even if the current tunnel fails.
*
* @private
*/
function commit_tunnel() {
tunnel.onstatechange = chained_tunnel.onstatechange;
tunnel.oninstruction = chained_tunnel.oninstruction;
tunnel.onerror = chained_tunnel.onerror;
// Assign UUID if already known
if (tunnel.uuid)
chained_tunnel.setUUID(tunnel.uuid);
// Assign any future received UUIDs such that they are
// accessible from the main uuid property of the chained tunnel
tunnel.onuuid = function uuidReceived(uuid) {
chained_tunnel.setUUID(uuid);
};
committedTunnel = tunnel;
}
// Wrap own onstatechange within current tunnel
tunnel.onstatechange = function(state) {
switch (state) {
// If open, use this tunnel from this point forward.
case Guacamole.Tunnel.State.OPEN:
commit_tunnel();
if (chained_tunnel.onstatechange)
chained_tunnel.onstatechange(state);
break;
// If closed, mark failure, attempt next tunnel
case Guacamole.Tunnel.State.CLOSED:
if (!failTunnel() &amp;&amp; chained_tunnel.onstatechange)
chained_tunnel.onstatechange(state);
break;
}
};
// Wrap own oninstruction within current tunnel
tunnel.oninstruction = function(opcode, elements) {
// Accept current tunnel
commit_tunnel();
// Invoke handler
if (chained_tunnel.oninstruction)
chained_tunnel.oninstruction(opcode, elements);
};
// Attach next tunnel on error
tunnel.onerror = function(status) {
// Mark failure, attempt next tunnel
if (!failTunnel(status) &amp;&amp; chained_tunnel.onerror)
chained_tunnel.onerror(status);
};
// Attempt connection
tunnel.connect(connect_data);
}
this.connect = function(data) {
// Remember connect data
connect_data = data;
// Get committed tunnel if exists or the first tunnel on the list
var next_tunnel = committedTunnel ? committedTunnel : tunnels.shift();
// Attach first tunnel
if (next_tunnel)
attach(next_tunnel);
// If there IS no first tunnel, error
else if (chained_tunnel.onerror)
chained_tunnel.onerror(Guacamole.Status.Code.SERVER_ERROR, "No tunnels to try.");
};
};
Guacamole.ChainedTunnel.prototype = new Guacamole.Tunnel();
/**
* Guacamole Tunnel which replays a Guacamole protocol dump from a static file
* received via HTTP. Instructions within the file are parsed and handled as
* quickly as possible, while the file is being downloaded.
*
* @constructor
* @augments Guacamole.Tunnel
* @param {!string} url
* The URL of a Guacamole protocol dump.
*
* @param {boolean} [crossDomain=false]
* Whether tunnel requests will be cross-domain, and thus must use CORS
* mechanisms and headers. By default, it is assumed that tunnel requests
* will be made to the same domain.
*
* @param {object} [extraTunnelHeaders={}]
* Key value pairs containing the header names and values of any additional
* headers to be sent in tunnel requests. By default, no extra headers will
* be added.
*/
Guacamole.StaticHTTPTunnel = function StaticHTTPTunnel(url, crossDomain, extraTunnelHeaders) {
/**
* Reference to this Guacamole.StaticHTTPTunnel.
*
* @private
*/
var tunnel = this;
/**
* AbortController instance which allows the current, in-progress HTTP
* request to be aborted. If no request is currently in progress, this will
* be null.
*
* @private
* @type {AbortController}
*/
var abortController = null;
/**
* Additional headers to be sent in tunnel requests. This dictionary can be
* populated with key/value header pairs to pass information such as authentication
* tokens, etc.
*
* @private
* @type {!object}
*/
var extraHeaders = extraTunnelHeaders || {};
/**
* The number of bytes in the file being downloaded, or null if this is not
* known.
*
* @type {number}
*/
this.size = null;
this.sendMessage = function sendMessage(elements) {
// Do nothing
};
this.connect = function connect(data) {
// Ensure any existing connection is killed
tunnel.disconnect();
// Connection is now starting
tunnel.setState(Guacamole.Tunnel.State.CONNECTING);
// Create Guacamole protocol and UTF-8 parsers specifically for this
// connection
var parser = new Guacamole.Parser();
var utf8Parser = new Guacamole.UTF8Parser();
// Invoke tunnel's oninstruction handler for each parsed instruction
parser.oninstruction = function instructionReceived(opcode, args) {
if (tunnel.oninstruction)
tunnel.oninstruction(opcode, args);
};
// Allow new request to be aborted
abortController = new AbortController();
// Stream using the Fetch API
fetch(url, {
headers : extraHeaders,
credentials : crossDomain ? 'include' : 'same-origin',
signal : abortController.signal
})
.then(function gotResponse(response) {
// Reset state and close upon error
if (!response.ok) {
if (tunnel.onerror)
tunnel.onerror(new Guacamole.Status(
Guacamole.Status.Code.fromHTTPCode(response.status), response.statusText));
tunnel.disconnect();
return;
}
// Report overall size of stream in bytes, if known
tunnel.size = response.headers.get('Content-Length');
// Connection is open
tunnel.setState(Guacamole.Tunnel.State.OPEN);
var reader = response.body.getReader();
var processReceivedText = function processReceivedText(result) {
// Clean up and close when done
if (result.done) {
tunnel.disconnect();
return;
}
// Parse only the portion of data which is newly received
parser.receive(utf8Parser.decode(result.value));
// Continue parsing when next chunk is received
reader.read().then(processReceivedText);
};
// Schedule parse of first chunk
reader.read().then(processReceivedText);
});
};
this.disconnect = function disconnect() {
// Abort any in-progress request
if (abortController) {
abortController.abort();
abortController = null;
}
// Connection is now closed
tunnel.setState(Guacamole.Tunnel.State.CLOSED);
};
};
Guacamole.StaticHTTPTunnel.prototype = new Guacamole.Tunnel();
</code></pre>
</article>
</section>
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