mirror of
https://github.com/gorhill/uMatrix.git
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223 lines
7.4 KiB
JavaScript
223 lines
7.4 KiB
JavaScript
/*******************************************************************************
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µMatrix - a Chromium browser extension to black/white list requests.
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Copyright (C) 2014 Raymond Hill
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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 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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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 General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see {http://www.gnu.org/licenses/}.
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Home: https://github.com/gorhill/uMatrix
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*/
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/* jshint multistr: true */
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/* global chrome */
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// Injected into content pages
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/******************************************************************************/
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// OK, I keep changing my mind whether a closure should be used or not. This
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// will be the rule: if there are any variables directly accessed on a regular
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// basis, use a closure so that they are cached. Otherwise I don't think the
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// overhead of a closure is worth it. That's my understanding.
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(function() {
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/******************************************************************************/
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/******************************************************************************/
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// https://github.com/gorhill/httpswitchboard/issues/345
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var messaging = (function(name){
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var port = null;
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var requestId = 1;
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var requestIdToCallbackMap = {};
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var listenCallback = null;
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var onPortMessage = function(details) {
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if ( typeof details.id !== 'number' ) {
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return;
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}
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// Announcement?
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if ( details.id < 0 ) {
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if ( listenCallback ) {
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listenCallback(details.msg);
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}
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return;
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}
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var callback = requestIdToCallbackMap[details.id];
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if ( !callback ) {
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return;
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}
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// Must be removed before calling client to be sure to not execute
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// callback again if the client stops the messaging service.
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delete requestIdToCallbackMap[details.id];
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callback(details.msg);
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};
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var start = function(name) {
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port = chrome.runtime.connect({ name: name });
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port.onMessage.addListener(onPortMessage);
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// https://github.com/gorhill/uBlock/issues/193
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port.onDisconnect.addListener(stop);
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};
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var stop = function() {
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listenCallback = null;
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port.disconnect();
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port = null;
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flushCallbacks();
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};
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if ( typeof name === 'string' && name !== '' ) {
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start(name);
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}
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var ask = function(msg, callback) {
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if ( port === null ) {
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if ( typeof callback === 'function' ) {
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callback();
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}
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return;
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}
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if ( callback === undefined ) {
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tell(msg);
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return;
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}
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var id = requestId++;
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port.postMessage({ id: id, msg: msg });
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requestIdToCallbackMap[id] = callback;
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};
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var tell = function(msg) {
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if ( port !== null ) {
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port.postMessage({ id: 0, msg: msg });
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}
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};
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var listen = function(callback) {
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listenCallback = callback;
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};
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var flushCallbacks = function() {
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var callback;
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for ( var id in requestIdToCallbackMap ) {
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if ( requestIdToCallbackMap.hasOwnProperty(id) === false ) {
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continue;
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}
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callback = requestIdToCallbackMap[id];
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if ( !callback ) {
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continue;
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}
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// Must be removed before calling client to be sure to not execute
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// callback again if the client stops the messaging service.
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delete requestIdToCallbackMap[id];
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callback();
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}
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};
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return {
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start: start,
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stop: stop,
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ask: ask,
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tell: tell,
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listen: listen
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};
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})('contentscript-start.js');
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/******************************************************************************/
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/******************************************************************************/
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// If you play with this code, mind:
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// https://github.com/gorhill/httpswitchboard/issues/261
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// https://github.com/gorhill/httpswitchboard/issues/252
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var navigatorSpoofer = " \
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;(function() { \
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try { \
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var spoofedUserAgent = {{ua-json}}; \
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if ( spoofedUserAgent === navigator.userAgent ) { \
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return; \
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} \
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var realNavigator = navigator; \
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var SpoofedNavigator = function(ua) { \
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this.navigator = navigator; \
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}; \
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var spoofedNavigator = new SpoofedNavigator(spoofedUserAgent); \
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var makeFunction = function(n, k) { \
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n[k] = function() { \
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return this.navigator[k].apply(this.navigator, arguments); }; \
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}; \
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for ( var k in realNavigator ) { \
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if ( typeof realNavigator[k] === 'function' ) { \
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makeFunction(spoofedNavigator, k); \
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} else { \
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spoofedNavigator[k] = realNavigator[k]; \
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} \
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} \
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spoofedNavigator.userAgent = spoofedUserAgent; \
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var pos = spoofedUserAgent.indexOf('/'); \
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spoofedNavigator.appName = pos < 0 ? '' : spoofedUserAgent.slice(0, pos); \
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spoofedNavigator.appVersion = pos < 0 ? spoofedUserAgent : spoofedUserAgent.slice(pos + 1); \
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navigator = window.navigator = spoofedNavigator; \
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} catch (e) { \
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} \
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})();";
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/******************************************************************************/
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// Because window.userAgent is read-only, we need to create a fake Navigator
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// object to contain our fake user-agent string.
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// Because objects created by a content script are local to the content script
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// and not visible to the web page itself (and vice versa), we need the context
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// of the web page to create the fake Navigator object directly, and the only
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// way to do this is to inject appropriate javascript code into the web page.
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var injectNavigatorSpoofer = function(spoofedUserAgent) {
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if ( typeof spoofedUserAgent !== 'string' ) {
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return;
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}
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if ( spoofedUserAgent === navigator.userAgent ) {
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return;
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}
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var script = document.createElement('script');
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script.type = 'text/javascript';
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script.id = 'umatrix-ua-spoofer';
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var js = document.createTextNode(navigatorSpoofer.replace('{{ua-json}}', JSON.stringify(spoofedUserAgent)));
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script.appendChild(js);
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try {
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var parent = document.head || document.documentElement;
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parent.appendChild(script);
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}
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catch (e) {
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}
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};
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messaging.ask({ what: 'getUserAgentReplaceStr' }, injectNavigatorSpoofer);
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/******************************************************************************/
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/******************************************************************************/
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// The port will never be used again at this point, disconnecting allows
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// to browser to flush this script from memory.
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messaging.stop();
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/******************************************************************************/
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/******************************************************************************/
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})();
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/******************************************************************************/
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