mirror of
https://github.com/gorhill/uBlock.git
synced 2024-11-02 00:42:45 +01:00
400 lines
13 KiB
JavaScript
400 lines
13 KiB
JavaScript
/*******************************************************************************
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µBlock - a Chromium browser extension to block requests.
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Copyright (C) 2014 The µBlock authors
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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/uBlock
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*/
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// For non background pages
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/* global addMessageListener, removeMessageListener, sendAsyncMessage */
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/******************************************************************************/
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(function() {
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'use strict';
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/******************************************************************************/
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self.vAPI = self.vAPI || {};
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self.vAPI.safari = true;
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/******************************************************************************/
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// since this is common across vendors
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var messagingConnector = function(response) {
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var channel, listener;
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if (!response) {
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return;
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}
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if (response.broadcast === true) {
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for (channel in vAPI.messaging.channels) {
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listener = vAPI.messaging.channels[channel].listener;
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if (typeof listener === 'function') {
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listener(response.msg);
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}
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}
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return;
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}
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if (response.requestId) {
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listener = vAPI.messaging.listeners[response.requestId];
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delete vAPI.messaging.listeners[response.requestId];
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delete response.requestId;
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}
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if (!listener) {
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channel = vAPI.messaging.channels[response.portName];
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listener = channel && channel.listener;
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}
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if (typeof listener === 'function') {
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listener(response.msg);
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}
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};
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var uniqueId = function() {
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return parseInt(Math.random() * 1e10, 10).toString(36);
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};
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/******************************************************************************/
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// relevant?
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// https://developer.apple.com/library/safari/documentation/Tools/Conceptual/SafariExtensionGuide/MessagesandProxies/MessagesandProxies.html#//apple_ref/doc/uid/TP40009977-CH14-SW12
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vAPI.messaging = {
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channels: {},
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listeners: {},
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requestId: 0,
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connectorId: uniqueId(),
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setup: function() {
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this.connector = function(msg) {
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// messages from the background script are sent to every frame,
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// so we need to check the connectorId to accept only
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// what is meant for the current context
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if (msg.name === vAPI.messaging.connectorId
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|| msg.name === 'broadcast') {
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messagingConnector(msg.message);
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}
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};
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safari.self.addEventListener('message', this.connector, false);
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this.channels['vAPI'] = {
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listener: function(msg) {
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if (msg.cmd === 'runScript' && msg.details.code) {
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Function(msg.details.code).call(self);
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}
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}
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};
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},
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close: function() {
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if (this.connector) {
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safari.self.removeEventListener('message', this.connector, false);
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this.connector = this.channels = this.listeners = null;
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}
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},
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channel: function(channelName, callback) {
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if (!channelName) {
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return;
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}
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this.channels[channelName] = {
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portName: channelName,
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listener: typeof callback === 'function' ? callback : null,
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send: function(message, callback) {
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if (!vAPI.messaging.connector) {
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vAPI.messaging.setup();
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}
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message = {
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portName: this.portName,
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msg: message
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};
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if (callback) {
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message.requestId = ++vAPI.messaging.requestId;
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vAPI.messaging.listeners[message.requestId] = callback;
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}
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if (safari.extension.globalPage) {
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// popover content doesn't know messaging...
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safari.extension.globalPage.contentWindow
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.vAPI.messaging.connector({
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name: vAPI.messaging.connectorId,
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message: message,
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target: {
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page: {
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dispatchMessage: function(name, msg) {
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messagingConnector(msg);
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}
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}
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}
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});
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}
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else {
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safari.self.tab.dispatchMessage(
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vAPI.messaging.connectorId,
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message
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);
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}
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},
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close: function() {
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delete vAPI.messaging.channels[this.portName];
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}
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};
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return this.channels[channelName];
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}
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};
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/******************************************************************************/
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if (location.protocol === "safari-extension:") {
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return;
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}
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/******************************************************************************/
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window.MutationObserver = window.MutationObserver || window.WebKitMutationObserver;
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if (!window.MutationObserver) {
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// dummy, minimalistic shim for older versions (<6)
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// only supports node insertions, but currently we don't use it for anything else
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window.MutationObserver = function(handler) {
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this.observe = function(target) {
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target.addEventListener('DOMNodeInserted', function(e) {
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handler([{addedNodes: [e.target]}]);
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}, true);
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};
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}
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}
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/******************************************************************************/
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var beforeLoadEvent = document.createEvent('Event');
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beforeLoadEvent.initEvent('beforeload');
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/******************************************************************************/
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var frameId = window === window.top ? 0 : Date.now() % 1E5;
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var linkHelper = document.createElement('a');
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var onBeforeLoad = function(e, details) {
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if (e.url && e.url.slice(0, 5) === 'data:') {
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return;
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}
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linkHelper.href = details ? details.url : e.url;
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if (!/^https?:/.test(linkHelper.protocol)) {
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return;
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}
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if (details) {
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details.url = linkHelper.href;
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}
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else {
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details = {
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url: linkHelper.href
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};
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switch (e.target.nodeName.toLowerCase()) {
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case 'frame':
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case 'iframe':
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details.type = 'sub_frame';
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break;
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case 'script':
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details.type = 'script';
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break;
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case 'img':
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case 'input': // type=image
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details.type = 'image';
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break;
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case 'object':
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case 'embed':
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details.type = 'object';
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break;
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case 'link':
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var rel = e.target.rel.trim().toLowerCase();
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if (rel.indexOf('icon') > -1) {
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details.type = 'image';
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break;
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}
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else if (rel === 'stylesheet') {
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details.type = 'stylesheet';
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break;
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}
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default:
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details.type = 'other';
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}
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// This can run even before the first DOMSubtreeModified event fired
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if (firstMutation) {
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firstMutation();
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}
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}
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// tabId is determined in the background script
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// details.tabId = null;
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details.frameId = frameId;
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details.parentFrameId = frameId ? 0 : -1;
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details.timeStamp = Date.now();
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var response = safari.self.tab.canLoad(e, details);
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if (!response) {
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if (details.type === 'main_frame') {
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window.stop();
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}
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else {
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e.preventDefault();
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}
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return false;
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}
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// local mirroring, response is a data: URL here
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else if (typeof response === 'string' && details.type === 'script') {
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// Content Security Policy with disallowed inline scripts may break things
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e.preventDefault();
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details = document.createElement('script');
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details.textContent = atob(response.slice(response.indexOf(',', 20) + 1));
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if (e.target.hasAttribute('defer') && document.readyState === 'loading') {
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var jsOnLoad = function(ev) {
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this.removeEventListener(ev.type, jsOnLoad, true);
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this.body.removeChild(this.body.appendChild(details));
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};
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document.addEventListener('DOMContentLoaded', jsOnLoad, true);
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}
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else {
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e.target.parentNode.insertBefore(details, e.target);
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details.parentNode.removeChild(details);
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}
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}
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};
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document.addEventListener('beforeload', onBeforeLoad, true);
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/******************************************************************************/
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// block pop-ups, intercept xhr requests, and apply site patches
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var firstMutation = function() {
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document.removeEventListener('DOMSubtreeModified', firstMutation, true);
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firstMutation = null;
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var randEventName = parseInt(Math.random() * 1e15, 10).toString(36);
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window.addEventListener(randEventName, function(e) {
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var result = onBeforeLoad(beforeLoadEvent, e.detail);
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if (result === false) {
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e.detail.url = false;
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}
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}, true);
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// the extension context is unable to reach the page context,
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// also this only works when Content Security Policy allows inline scripts
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var tmpJS = document.createElement('script');
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var tmpScript = ["(function() {",
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"var block = function(u, t) {",
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"var e = document.createEvent('CustomEvent'),",
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"d = {url: u, type: t};",
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"e.initCustomEvent('" + randEventName + "', !1, !1, d);",
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"dispatchEvent(e);",
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"return d.url === !1;",
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"}, wo = open, xo = XMLHttpRequest.prototype.open;",
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"open = function(u) {",
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"return block(u, 'popup') ? null : wo.apply(this, [].slice.call(arguments));",
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"};",
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"XMLHttpRequest.prototype.open = function(m, u, s) {",
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"return xo.apply(this, block(u, 'xmlhttprequest') ? ['HEAD', u, s] : [].slice.call(arguments));",
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"};"
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];
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if (vAPI.sitePatch
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&& !safari.self.tab.canLoad(beforeLoadEvent, {isWhiteListed: location.href})) {
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tmpScript.push('(' + vAPI.sitePatch + ')();');
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}
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tmpScript.push("})();");
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tmpJS.textContent = tmpScript.join('');
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document.documentElement.removeChild(document.documentElement.appendChild(tmpJS));
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};
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document.addEventListener('DOMSubtreeModified', firstMutation, true);
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/******************************************************************************/
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var onContextMenu = function(e) {
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var details = {
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tagName: e.target.tagName.toLowerCase(),
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pageUrl: location.href,
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insideFrame: window !== window.top
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};
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details.editable = details.tagName === 'textarea' || details.tagName === 'input';
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if ('checked' in e.target) {
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details.checked = e.target.checked;
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}
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if (details.tagName === 'a') {
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details.linkUrl = e.target.href;
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}
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if ('src' in e.target) {
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details.srcUrl = e.target.src;
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if (details.tagName === 'img') {
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details.mediaType = 'image';
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}
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else if (details.tagName === 'video' || details.tagName === 'audio') {
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details.mediaType = details.tagName;
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}
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}
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safari.self.tab.setContextMenuEventUserInfo(e, details);
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};
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self.addEventListener('contextmenu', onContextMenu, true);
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/******************************************************************************/
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// 'main_frame' simulation
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if (frameId === 0) {
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onBeforeLoad(beforeLoadEvent, {
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url: location.href,
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type: 'main_frame'
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});
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}
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/******************************************************************************/
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self.vAPI.canExecuteContentScript = function() {
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return /^https?:/.test(location.protocol);
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};
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/******************************************************************************/
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})();
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/******************************************************************************/
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