mirror of
https://github.com/gyurix1968/guacamole-client.git
synced 2025-09-07 05:31:22 +00:00
Extracted tunnel, mouse, and keyboard handling from GuacamoleClient
This commit is contained in:
Michael Jumper
266
guacamole-common-js/src/main/resources/tunnel.js
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266
guacamole-common-js/src/main/resources/tunnel.js
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/*
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* Guacamole - Clientless Remote Desktop
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* Copyright (C) 2010 Michael Jumper
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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*/
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function GuacamoleHTTPTunnel(tunnelURL) {
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var TUNNEL_CONNECT = tunnelURL + "?connect";
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var TUNNEL_READ = tunnelURL + "?read";
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var TUNNEL_WRITE = tunnelURL + "?write";
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var pollResponse = 1; // Default to polling - will be turned off automatically if not needed
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var instructionHandler = null;
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var sendingMessages = 0;
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var outputMessageBuffer = "";
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function sendMessage(message) {
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// Add event to queue, restart send loop if finished.
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outputMessageBuffer += message;
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if (sendingMessages == 0)
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sendPendingMessages();
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};
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function sendPendingMessages() {
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if (outputMessageBuffer.length > 0) {
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sendingMessages = 1;
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var message_xmlhttprequest = new XMLHttpRequest();
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message_xmlhttprequest.open("POST", TUNNEL_WRITE);
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message_xmlhttprequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
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message_xmlhttprequest.setRequestHeader("Content-length", outputMessageBuffer.length);
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// Once response received, send next queued event.
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message_xmlhttprequest.onreadystatechange = function() {
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if (message_xmlhttprequest.readyState == 4)
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sendPendingMessages();
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}
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message_xmlhttprequest.send(outputMessageBuffer);
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outputMessageBuffer = ""; // Clear buffer
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}
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else
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sendingMessages = 0;
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}
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function handleResponse(xmlhttprequest) {
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var interval = null;
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var nextRequest = null;
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var dataUpdateEvents = 0;
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var instructionStart = 0;
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var startIndex = 0;
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function parseResponse() {
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// Start next request as soon as possible
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if (xmlhttprequest.readyState >= 2 && nextRequest == null)
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nextRequest = makeRequest();
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// Parse stream when data is received and when complete.
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if (xmlhttprequest.readyState == 3 ||
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xmlhttprequest.readyState == 4) {
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// Also poll every 30ms (some browsers don't repeatedly call onreadystatechange for new data)
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if (pollResponse == 1) {
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if (xmlhttprequest.readyState == 3 && interval == null)
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interval = setInterval(parseResponse, 30);
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else if (xmlhttprequest.readyState == 4 && interval != null)
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clearInterval(interval);
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}
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// Halt on error during request
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if (xmlhttprequest.status == 0) {
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showError("Request canceled by browser.");
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return;
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}
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else if (xmlhttprequest.status != 200) {
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showError("Error during request (HTTP " + xmlhttprequest.status + "): " + xmlhttprequest.statusText);
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return;
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}
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var current = xmlhttprequest.responseText;
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var instructionEnd;
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while ((instructionEnd = current.indexOf(";", startIndex)) != -1) {
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// Start next search at next instruction
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startIndex = instructionEnd+1;
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var instruction = current.substr(instructionStart,
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instructionEnd - instructionStart);
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instructionStart = startIndex;
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var opcodeEnd = instruction.indexOf(":");
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var opcode;
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var parameters;
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if (opcodeEnd == -1) {
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opcode = instruction;
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parameters = new Array();
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}
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else {
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opcode = instruction.substr(0, opcodeEnd);
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parameters = instruction.substr(opcodeEnd+1).split(",");
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}
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// If we're done parsing, handle the next response.
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if (opcode.length == 0) {
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delete xmlhttprequest;
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if (nextRequest)
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handleResponse(nextRequest);
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break;
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}
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// Call instruction handler.
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if (instructionHandler != null)
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instructionHandler(opcode, parameters);
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}
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// Start search at end of string.
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startIndex = current.length;
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delete instruction;
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delete parameters;
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}
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}
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// If response polling enabled, attempt to detect if still
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// necessary (via wrapping parseResponse())
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if (pollResponse == 1) {
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xmlhttprequest.onreadystatechange = function() {
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// If we receive two or more readyState==3 events,
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// there is no need to poll.
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if (xmlhttprequest.readyState == 3) {
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dataUpdateEvents++;
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if (dataUpdateEvents >= 2) {
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pollResponse = 0;
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xmlhttprequest.onreadystatechange = parseResponse;
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}
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}
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parseResponse();
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}
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}
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// Otherwise, just parse
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else
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xmlhttprequest.onreadystatechange = parseResponse;
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parseResponse();
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}
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function makeRequest() {
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// Download self
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var xmlhttprequest = new XMLHttpRequest();
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xmlhttprequest.open("POST", TUNNEL_READ);
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xmlhttprequest.send(null);
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return xmlhttprequest;
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}
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function connect() {
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// Start tunnel and connect synchronously
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var connect_xmlhttprequest = new XMLHttpRequest();
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connect_xmlhttprequest.open("POST", TUNNEL_CONNECT, false);
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connect_xmlhttprequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
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connect_xmlhttprequest.setRequestHeader("Content-length", 0);
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connect_xmlhttprequest.send(null);
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// Start reading data
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handleResponse(makeRequest());
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};
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// External API
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this.connect = connect;
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this.sendMessage = sendMessage;
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this.setInstructionHandler = function(handler) {
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instructionHandler = handler;
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}
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this.escapeGuacamoleString = function(str) {
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var escapedString = "";
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for (var i=0; i<str.length; i++) {
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var c = str.charAt(i);
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if (c == ",")
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escapedString += "\\c";
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else if (c == ";")
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escapedString += "\\s";
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else if (c == "\\")
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escapedString += "\\\\";
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else
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escapedString += c;
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}
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return escapedString;
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}
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this.unescapeGuacamoleString = function(str) {
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var unescapedString = "";
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for (var i=0; i<str.length; i++) {
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var c = str.charAt(i);
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if (c == "\\" && i<str.length-1) {
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var escapeChar = str.charAt(++i);
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if (escapeChar == "c")
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unescapedString += ",";
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else if (escapeChar == "s")
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unescapedString += ";";
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else if (escapeChar == "\\")
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unescapedString += "\\";
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else
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unescapedString += "\\" + escapeChar;
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}
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else
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unescapedString += c;
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}
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return unescapedString;
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}
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}
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