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361 lines
11 KiB
361 lines
11 KiB
/*******************************************************************************
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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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/******************************************************************************/
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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-end.js');
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/******************************************************************************/
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/******************************************************************************/
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// This is to be executed only once: putting this code in its own closure
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// means the code will be flushed from memory once executed.
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(function() {
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/******************************************************************************/
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/*------------[ Unrendered Noscript (because CSP) Workaround ]----------------*/
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var checkScriptBlacklistedHandler = function(response) {
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if ( !response.scriptBlacklisted ) {
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return;
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}
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var scripts = document.querySelectorAll('noscript');
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var i = scripts.length;
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var realNoscript, fakeNoscript;
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while ( i-- ) {
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realNoscript = scripts[i];
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fakeNoscript = document.createElement('div');
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fakeNoscript.innerHTML = '<!-- uMatrix NOSCRIPT tag replacement: see <https://github.com/gorhill/httpswitchboard/issues/177> -->\n' + realNoscript.textContent;
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realNoscript.parentNode.replaceChild(fakeNoscript, realNoscript);
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}
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};
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messaging.ask({
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what: 'checkScriptBlacklisted',
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url: window.location.href
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},
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checkScriptBlacklistedHandler
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);
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/******************************************************************************/
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var localStorageHandler = function(mustRemove) {
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if ( mustRemove ) {
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window.localStorage.clear();
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window.sessionStorage.clear();
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// console.debug('HTTP Switchboard > found and removed non-empty localStorage');
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}
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};
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// Check with extension whether local storage must be emptied
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// rhill 2014-03-28: we need an exception handler in case 3rd-party access
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// to site data is disabled.
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// https://github.com/gorhill/httpswitchboard/issues/215
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try {
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var hasLocalStorage = window.localStorage && window.localStorage.length;
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var hasSessionStorage = window.sessionStorage && window.sessionStorage.length;
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if ( hasLocalStorage || hasSessionStorage ) {
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messaging.ask({
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what: 'contentScriptHasLocalStorage',
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url: window.location.href
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},
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localStorageHandler
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);
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}
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// TODO: indexedDB
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if ( window.indexedDB && !!window.indexedDB.webkitGetDatabaseNames ) {
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// var db = window.indexedDB.webkitGetDatabaseNames().onsuccess = function(sender) {
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// console.debug('webkitGetDatabaseNames(): result=%o', sender.target.result);
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// };
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}
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// TODO: Web SQL
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if ( window.openDatabase ) {
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// Sad:
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// "There is no way to enumerate or delete the databases available for an origin from this API."
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// Ref.: http://www.w3.org/TR/webdatabase/#databases
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}
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}
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catch (e) {
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}
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/******************************************************************************/
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})();
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/******************************************************************************/
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/******************************************************************************/
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(function() {
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/******************************************************************************/
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var nodesAddedHandler = function(nodeList, summary) {
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var i = 0;
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var node, src, text;
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while ( node = nodeList.item(i++) ) {
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if ( !node.tagName ) {
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continue;
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}
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switch ( node.tagName.toUpperCase() ) {
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case 'SCRIPT':
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// https://github.com/gorhill/httpswitchboard/issues/252
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// Do not count µMatrix's own script tags, they are not required
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// to "unbreak" a web page
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if ( node.id && node.id.indexOf('uMatrix-') === 0 ) {
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break;
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}
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text = node.textContent.trim();
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if ( text !== '' ) {
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summary.scriptSources['{inline_script}'] = true;
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summary.mustReport = true;
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}
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src = (node.src || '').trim();
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if ( src !== '' ) {
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summary.scriptSources[src] = true;
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summary.mustReport = true;
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}
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break;
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case 'A':
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if ( node.href.indexOf('javascript:') === 0 ) {
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summary.scriptSources['{inline_script}'] = true;
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summary.mustReport = true;
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}
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break;
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case 'OBJECT':
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src = (node.data || '').trim();
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if ( src !== '' ) {
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summary.pluginSources[src] = true;
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summary.mustReport = true;
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}
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break;
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case 'EMBED':
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src = (node.src || '').trim();
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if ( src !== '' ) {
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summary.pluginSources[src] = true;
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summary.mustReport = true;
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}
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break;
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}
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}
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};
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/******************************************************************************/
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var nodeListsAddedHandler = function(nodeLists) {
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var summary = {
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what: 'contentScriptSummary',
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locationURL: window.location.href,
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scriptSources: {}, // to avoid duplicates
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pluginSources: {}, // to avoid duplicates
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mustReport: false
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};
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var i = nodeLists.length;
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while ( i-- ) {
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nodesAddedHandler(nodeLists[i], summary);
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}
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if ( summary.mustReport ) {
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messaging.tell(summary);
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}
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};
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/******************************************************************************/
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// rhill 2013-11-09: Weird... This code is executed from HTTP Switchboard
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// context first time extension is launched. Avoid this.
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// TODO: Investigate if this was a fluke or if it can really happen.
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// I suspect this could only happen when I was using chrome.tabs.executeScript(),
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// because now a delarative content script is used, along with "http{s}" URL
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// pattern matching.
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// console.debug('contentscript-end.js > window.location.href = "%s"', window.location.href);
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if ( /^https?:\/\/./.test(window.location.href) === false ) {
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console.debug("Huh?");
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return;
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}
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/******************************************************************************/
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(function() {
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var summary = {
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what: 'contentScriptSummary',
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locationURL: window.location.href,
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scriptSources: {}, // to avoid duplicates
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pluginSources: {}, // to avoid duplicates
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mustReport: true
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};
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// https://github.com/gorhill/httpswitchboard/issues/25
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// &
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// Looks for inline javascript also in at least one a[href] element.
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// https://github.com/gorhill/httpswitchboard/issues/131
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nodesAddedHandler(document.querySelectorAll('script, a[href^="javascript:"], object, embed'), summary);
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//console.debug('contentscript-end.js > firstObservationHandler(): found %d script tags in "%s"', Object.keys(summary.scriptSources).length, window.location.href);
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messaging.tell(summary);
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})();
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/******************************************************************************/
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// Observe changes in the DOM
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var mutationObservedHandler = function(mutations) {
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var i = mutations.length;
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var nodeLists = [], nodeList;
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while ( i-- ) {
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nodeList = mutations[i].addedNodes;
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if ( nodeList && nodeList.length ) {
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nodeLists.push(nodeList);
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}
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}
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if ( nodeLists.length ) {
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nodeListsAddedHandler(nodeLists);
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}
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};
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// This fixes http://acid3.acidtests.org/
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if ( document.body ) {
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// https://github.com/gorhill/httpswitchboard/issues/176
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var observer = new MutationObserver(mutationObservedHandler);
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observer.observe(document.body, {
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attributes: false,
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childList: true,
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characterData: false,
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subtree: true
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});
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}
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/******************************************************************************/
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})();
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