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557 lines
18 KiB
JavaScript
557 lines
18 KiB
JavaScript
/*******************************************************************************
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uMatrix - a Chromium browser extension to black/white list requests.
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Copyright (C) 2014-2017 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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/* global HTMLDocument */
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'use strict';
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/******************************************************************************/
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/******************************************************************************/
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// Injected into content pages
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(function() {
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/******************************************************************************/
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// https://github.com/chrisaljoudi/uBlock/issues/464
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if ( document instanceof HTMLDocument === false ) {
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//console.debug('contentscript.js > not a HTLMDocument');
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return;
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}
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// This can also happen (for example if script injected into a `data:` URI doc)
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if ( !window.location ) {
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return;
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}
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// This can happen
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if ( typeof vAPI !== 'object' ) {
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//console.debug('contentscript.js > vAPI not found');
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return;
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}
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// https://github.com/chrisaljoudi/uBlock/issues/456
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// Already injected?
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if ( vAPI.contentscriptEndInjected ) {
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//console.debug('contentscript.js > content script already injected');
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return;
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}
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vAPI.contentscriptEndInjected = true;
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/******************************************************************************/
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/******************************************************************************/
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// Executed only once.
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(function() {
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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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vAPI.messaging.send('contentscript.js', {
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what: 'contentScriptHasLocalStorage',
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url: window.location.href
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}, localStorageHandler);
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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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// https://github.com/gorhill/uMatrix/issues/45
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var collapser = (function() {
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var timer = null;
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var requestId = 1;
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var newRequests = [];
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var pendingRequests = {};
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var pendingRequestCount = 0;
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var srcProps = {
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'img': 'src'
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};
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var reURLplaceholder = /\{\{url\}\}/g;
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var PendingRequest = function(target) {
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this.id = requestId++;
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this.target = target;
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pendingRequests[this.id] = this;
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pendingRequestCount += 1;
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};
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// Because a while ago I have observed constructors are faster than
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// literal object instanciations.
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var BouncingRequest = function(id, tagName, url) {
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this.id = id;
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this.tagName = tagName;
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this.url = url;
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this.blocked = false;
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};
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var onProcessed = function(response) {
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if ( !response ) {
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return;
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}
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var requests = response.requests;
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if ( requests === null || Array.isArray(requests) === false ) {
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return;
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}
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var collapse = response.collapse;
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var placeholders = response.placeholders;
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var i = requests.length;
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var request, entry, target, tagName, docurl, replaced;
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while ( i-- ) {
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request = requests[i];
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if ( pendingRequests.hasOwnProperty(request.id) === false ) {
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continue;
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}
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entry = pendingRequests[request.id];
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delete pendingRequests[request.id];
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pendingRequestCount -= 1;
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// Not blocked
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if ( !request.blocked ) {
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continue;
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}
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target = entry.target;
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// No placeholders
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if ( collapse ) {
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target.style.setProperty('display', 'none', 'important');
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continue;
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}
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tagName = target.localName;
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// Special case: iframe
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if ( tagName === 'iframe' ) {
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docurl = 'data:text/html,' + encodeURIComponent(placeholders.iframe.replace(reURLplaceholder, request.url));
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replaced = false;
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// Using contentWindow.location prevent tainting browser
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// history -- i.e. breaking back button (seen on Chromium).
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if ( target.contentWindow ) {
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try {
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target.contentWindow.location.replace(docurl);
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replaced = true;
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} catch(ex) {
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}
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}
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if ( !replaced ) {
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target.setAttribute('src', docurl);
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}
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continue;
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}
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// Everything else
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target.setAttribute(srcProps[tagName], placeholders[tagName]);
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target.style.setProperty('border', placeholders.border, 'important');
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target.style.setProperty('background', placeholders.background, 'important');
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}
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// Renew map: I believe that even if all properties are deleted, an
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// object will still use more memory than a brand new one.
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if ( pendingRequestCount === 0 ) {
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pendingRequests = {};
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}
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};
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var send = function() {
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timer = null;
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vAPI.messaging.send('contentscript.js', {
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what: 'evaluateURLs',
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requests: newRequests
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}, onProcessed);
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newRequests = [];
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};
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var process = function(delay) {
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if ( newRequests.length === 0 ) {
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return;
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}
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if ( delay === 0 ) {
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clearTimeout(timer);
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send();
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} else if ( timer === null ) {
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timer = vAPI.setTimeout(send, delay || 50);
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}
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};
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var iframeSourceModified = function(mutations) {
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var i = mutations.length;
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while ( i-- ) {
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addFrameNode(mutations[i].target, true);
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}
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process();
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};
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var iframeSourceObserver = null;
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var iframeSourceObserverOptions = {
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attributes: true,
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attributeFilter: [ 'src' ]
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};
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var addFrameNode = function(iframe, dontObserve) {
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// https://github.com/gorhill/uBlock/issues/162
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// Be prepared to deal with possible change of src attribute.
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if ( dontObserve !== true ) {
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if ( iframeSourceObserver === null ) {
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iframeSourceObserver = new MutationObserver(iframeSourceModified);
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}
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iframeSourceObserver.observe(iframe, iframeSourceObserverOptions);
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}
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// https://github.com/chrisaljoudi/uBlock/issues/174
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// Do not remove fragment from src URL
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var src = iframe.src;
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if ( src.lastIndexOf('http', 0) !== 0 ) {
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return;
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}
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var req = new PendingRequest(iframe);
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newRequests.push(new BouncingRequest(req.id, 'iframe', src));
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};
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var addNode = function(target) {
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var tagName = target.localName;
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if ( tagName === 'iframe' ) {
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addFrameNode(target);
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return;
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}
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var prop = srcProps[tagName];
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if ( prop === undefined ) {
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return;
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}
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// https://github.com/chrisaljoudi/uBlock/issues/174
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// Do not remove fragment from src URL
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var src = target[prop];
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if ( typeof src !== 'string' || src === '' ) {
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return;
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}
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if ( src.lastIndexOf('http', 0) !== 0 ) {
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return;
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}
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var req = new PendingRequest(target);
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newRequests.push(new BouncingRequest(req.id, tagName, src));
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};
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var addNodes = function(nodes) {
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var node;
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var i = nodes.length;
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while ( i-- ) {
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node = nodes[i];
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if ( node.nodeType === 1 ) {
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addNode(node);
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}
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}
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};
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var addBranches = function(branches) {
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var root;
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var i = branches.length;
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while ( i-- ) {
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root = branches[i];
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if ( root.nodeType === 1 ) {
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addNode(root);
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// blocked images will be reported by onResourceFailed
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addNodes(root.querySelectorAll('iframe'));
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}
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}
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};
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// Listener to collapse blocked resources.
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// - Future requests not blocked yet
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// - Elements dynamically added to the page
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// - Elements which resource URL changes
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var onResourceFailed = function(ev) {
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addNode(ev.target);
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process();
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};
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document.addEventListener('error', onResourceFailed, true);
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vAPI.shutdown.add(function() {
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if ( timer !== null ) {
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clearTimeout(timer);
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timer = null;
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}
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if ( iframeSourceObserver !== null ) {
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iframeSourceObserver.disconnect();
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iframeSourceObserver = null;
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}
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document.removeEventListener('error', onResourceFailed, true);
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newRequests = [];
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pendingRequests = {};
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pendingRequestCount = 0;
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});
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return {
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addNodes: addNodes,
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addBranches: addBranches,
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process: process
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};
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})();
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/******************************************************************************/
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/******************************************************************************/
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var hasInlineScript = function(nodeList, summary) {
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var i = 0;
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var node, text;
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while ( (node = nodeList.item(i++)) ) {
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if ( node.nodeType !== 1 ) {
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continue;
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}
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if ( typeof node.localName !== 'string' ) {
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continue;
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}
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if ( node.localName === 'script' ) {
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text = node.textContent.trim();
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if ( text === '' ) {
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continue;
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}
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summary.inlineScript = true;
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break;
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}
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if ( node.localName === 'a' && node.href.lastIndexOf('javascript', 0) === 0 ) {
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summary.inlineScript = true;
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break;
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}
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}
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if ( summary.inlineScript ) {
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summary.mustReport = true;
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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 i = nodeLists.length;
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if ( i === 0 ) {
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return;
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}
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var summary = {
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what: 'contentScriptSummary',
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locationURL: window.location.href,
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inlineScript: false,
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mustReport: false
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};
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while ( i-- ) {
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if ( summary.inlineScript === false ) {
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hasInlineScript(nodeLists[i], summary);
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}
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collapser.addBranches(nodeLists[i]);
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}
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if ( summary.mustReport ) {
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vAPI.messaging.send('contentscript.js', summary);
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}
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collapser.process();
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};
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/******************************************************************************/
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/******************************************************************************/
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// Executed only once.
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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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inlineScript: false,
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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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hasInlineScript(document.querySelectorAll('a[href^="javascript:"],script'), summary);
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//console.debug('contentscript.js > firstObservationHandler(): found %d script tags in "%s"', Object.keys(summary.scriptSources).length, window.location.href);
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vAPI.messaging.send('contentscript.js', summary);
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collapser.addNodes(document.querySelectorAll('iframe,img'));
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collapser.process();
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})();
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/******************************************************************************/
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/******************************************************************************/
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// Observe changes in the DOM
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// Added node lists will be cumulated here before being processed
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(function() {
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var addedNodeLists = [];
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var addedNodeListsTimer = null;
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var treeMutationObservedHandler = function() {
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nodeListsAddedHandler(addedNodeLists);
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addedNodeListsTimer = null;
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addedNodeLists = [];
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};
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// https://github.com/gorhill/uBlock/issues/205
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// Do not handle added node directly from within mutation observer.
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var treeMutationObservedHandlerAsync = function(mutations) {
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var iMutation = mutations.length;
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var nodeList;
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while ( iMutation-- ) {
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nodeList = mutations[iMutation].addedNodes;
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if ( nodeList.length !== 0 ) {
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addedNodeLists.push(nodeList);
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}
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}
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// I arbitrarily chose 250 ms for now:
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// I have to compromise between the overhead of processing too few
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// nodes too often and the delay of many nodes less often. There is nothing
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// time critical here.
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if ( addedNodeListsTimer === null ) {
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addedNodeListsTimer = vAPI.setTimeout(treeMutationObservedHandler, 250);
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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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return;
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}
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// https://github.com/gorhill/httpswitchboard/issues/176
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var treeObserver = new MutationObserver(treeMutationObservedHandlerAsync);
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treeObserver.observe(document.body, {
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childList: true,
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subtree: true
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});
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vAPI.shutdown.add(function() {
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if ( addedNodeListsTimer !== null ) {
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clearTimeout(addedNodeListsTimer);
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addedNodeListsTimer = null;
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}
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if ( treeObserver !== null ) {
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treeObserver.disconnect();
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treeObserver = null;
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}
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addedNodeLists = [];
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});
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})();
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/******************************************************************************/
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/******************************************************************************/
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// Executed only once.
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// https://github.com/gorhill/uMatrix/issues/232
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// Force `display` property, Firefox is still affected by the issue.
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(function() {
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var noscripts = document.querySelectorAll('noscript');
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if ( noscripts.length === 0 ) { return; }
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var redirectTimer,
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reMetaContent = /^\s*(\d+)\s*;\s*url=(['"]?)(https?:\/\/[^'"]+)\2/;
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|
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var autoRefresh = function(root) {
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var meta = root.querySelector('meta[http-equiv="refresh"][content]');
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if ( meta === null ) { return; }
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var match = reMetaContent.exec(meta.getAttribute('content'));
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if ( match === null || match[3].trim() === '' ) { return; }
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redirectTimer = setTimeout(
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function() {
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location.assign(match[3]);
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},
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parseInt(match[1], 10) * 1000 + 1
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);
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meta.parentNode.removeChild(meta);
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};
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|
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var renderNoscriptTags = function(response) {
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if ( response !== true ) { return; }
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var parser = new DOMParser();
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var doc, parent, span;
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for ( var noscript of noscripts ) {
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parent = noscript.parentNode;
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if ( parent === null ) { continue; }
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doc = parser.parseFromString(
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'<span>' + noscript.textContent + '</span>',
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'text/html'
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);
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span = document.adoptNode(doc.querySelector('span'));
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span.style.setProperty('display', 'inline', 'important');
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if ( redirectTimer === undefined ) {
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autoRefresh(span);
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}
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parent.replaceChild(span, noscript);
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}
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};
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vAPI.messaging.send(
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'contentscript.js',
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{ what: 'mustRenderNoscriptTags?' },
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renderNoscriptTags
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);
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})();
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|
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/******************************************************************************/
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/******************************************************************************/
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|
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vAPI.messaging.send(
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'contentscript.js',
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{ what: 'shutdown?' },
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function(response) {
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if ( response === true ) {
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vAPI.shutdown.exec();
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}
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}
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);
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|
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/******************************************************************************/
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/******************************************************************************/
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|
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})();
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