uBlock/platform/safari/vapi-client.js

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/*******************************************************************************
µBlock - a browser extension to block requests.
Copyright (C) 2014 The µBlock authors
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see {http://www.gnu.org/licenses/}.
Home: https://github.com/gorhill/uBlock
*/
// For non background pages
/******************************************************************************/
(function() {
'use strict';
/******************************************************************************/
self.vAPI = self.vAPI || {};
vAPI.safari = true;
/******************************************************************************/
var messagingConnector = function(response) {
if ( !response ) {
return;
}
var channels = vAPI.messaging.channels;
var channel, listener;
if ( response.broadcast === true && !response.portName ) {
for ( channel in channels ) {
if ( channels.hasOwnProperty(channel) === false ) {
continue;
}
listener = channels[channel].listener;
if ( typeof listener === 'function' ) {
listener(response.msg);
}
}
return;
}
if ( response.requestId ) {
listener = vAPI.messaging.listeners[response.requestId];
delete vAPI.messaging.listeners[response.requestId];
delete response.requestId;
}
if ( !listener ) {
channel = channels[response.portName];
listener = channel && channel.listener;
}
if ( typeof listener === 'function' ) {
listener(response.msg);
}
};
/******************************************************************************/
var uniqueId = function() {
return Math.random().toString(36).slice(2);
};
/******************************************************************************/
// relevant?
// https://developer.apple.com/library/safari/documentation/Tools/Conceptual/SafariExtensionGuide/MessagesandProxies/MessagesandProxies.html#//apple_ref/doc/uid/TP40009977-CH14-SW12
vAPI.messaging = {
channels: {},
listeners: {},
requestId: 1,
connectorId: uniqueId(),
setup: function() {
this.connector = function(msg) {
// messages from the background script are sent to every frame,
// so we need to check the connectorId to accept only
// what is meant for the current context
if (msg.name === vAPI.messaging.connectorId
|| msg.name === 'broadcast') {
messagingConnector(msg.message);
}
};
safari.self.addEventListener('message', this.connector, false);
this.channels['vAPI'] = {
listener: function(msg) {
if (msg.cmd === 'injectScript' && msg.details.code) {
Function(msg.details.code).call(self);
}
}
};
},
close: function() {
if (this.connector) {
safari.self.removeEventListener('message', this.connector, false);
this.connector = null;
this.channels = {};
this.listeners = {};
}
},
channel: function(channelName, callback) {
if ( !channelName ) {
return;
}
this.channels[channelName] = {
portName: channelName,
listener: typeof callback === 'function' ? callback : null,
send: function(message, callback) {
if (!vAPI.messaging.connector) {
vAPI.messaging.setup();
}
message = {
portName: this.portName,
msg: message
};
if ( callback ) {
message.requestId = vAPI.messaging.requestId++;
vAPI.messaging.listeners[message.requestId] = callback;
}
// popover content doesn't know messaging...
if (safari.extension.globalPage) {
if (!safari.self.visible) {
return;
}
safari.extension.globalPage.contentWindow
.vAPI.messaging.onMessage({
name: vAPI.messaging.connectorId,
message: message,
target: {
page: {
dispatchMessage: function(name, msg) {
messagingConnector(msg);
}
}
}
});
}
else {
safari.self.tab.dispatchMessage(
vAPI.messaging.connectorId,
message
);
}
},
close: function() {
delete vAPI.messaging.channels[this.portName];
}
};
return this.channels[channelName];
}
};
/******************************************************************************/
vAPI.canExecuteContentScript = function() {
return /^https?:/.test(location.protocol);
};
/******************************************************************************/
// This file can be included into extensin pages,
// but the following code should run only in content pages.
if (location.protocol === 'safari-extension:') {
return;
}
/******************************************************************************/
window.MutationObserver = window.MutationObserver || window.WebKitMutationObserver;
if (!window.MutationObserver) {
// dummy, minimalistic shim for older versions (<6)
// only supports node insertions, but currently we don't use it for anything else
window.MutationObserver = function(handler) {
this.observe = function(target) {
target.addEventListener('DOMNodeInserted', function(e) {
handler([{addedNodes: [e.target]}]);
}, true);
};
};
}
/******************************************************************************/
var beforeLoadEvent = document.createEvent('Event');
beforeLoadEvent.initEvent('beforeload');
/******************************************************************************/
var frameId = window === window.top ? 0 : Date.now() % 1E5;
var linkHelper = document.createElement('a');
var onBeforeLoad = function(e, details) {
if (e.url && e.url.slice(0, 5) === 'data:') {
return;
}
linkHelper.href = details ? details.url : e.url;
if (!(/^https?:/.test(linkHelper.protocol) || (details && details.type === 'popup'))) {
return;
}
if (details) {
details.url = linkHelper.href;
}
else {
details = {
url: linkHelper.href
};
switch (e.target.nodeName.toLowerCase()) {
case 'frame':
case 'iframe':
details.type = 'sub_frame';
break;
case 'script':
details.type = 'script';
break;
case 'img':
case 'input': // type=image
details.type = 'image';
break;
case 'object':
case 'embed':
details.type = 'object';
break;
case 'link':
var rel = e.target.rel.trim().toLowerCase();
if (rel.indexOf('icon') > -1) {
details.type = 'image';
break;
}
else if (rel === 'stylesheet') {
details.type = 'stylesheet';
break;
}
default:
details.type = 'other';
}
// This can run even before the first DOMSubtreeModified event fired
if (firstMutation) {
firstMutation();
}
}
// tabId is determined in the background script
// details.tabId = null;
details.frameId = frameId;
details.parentFrameId = frameId ? 0 : -1;
details.timeStamp = Date.now();
var response = safari.self.tab.canLoad(e, details);
if (!response) {
if (details.type === 'main_frame') {
window.stop();
}
else {
e.preventDefault();
}
return false;
}
// local mirroring, response is a data: URL here
else if (typeof response === 'string' && details.type === 'script') {
// Content Security Policy with disallowed inline scripts may break things
e.preventDefault();
details = document.createElement('script');
details.textContent = atob(response.slice(response.indexOf(',', 20) + 1));
if (e.target.hasAttribute('defer') && document.readyState === 'loading') {
var jsOnLoad = function(ev) {
this.removeEventListener(ev.type, jsOnLoad, true);
this.body.removeChild(this.body.appendChild(details));
};
document.addEventListener('DOMContentLoaded', jsOnLoad, true);
}
else {
e.target.parentNode.insertBefore(details, e.target);
details.parentNode.removeChild(details);
}
}
};
document.addEventListener('beforeload', onBeforeLoad, true);
/******************************************************************************/
// block pop-ups, intercept xhr requests, and apply site patches
var firstMutation = function() {
document.removeEventListener('DOMSubtreeModified', firstMutation, true);
firstMutation = null;
var randEventName = parseInt(Math.random() * 1e15, 10).toString(36);
window.addEventListener(randEventName, function(e) {
var result = onBeforeLoad(beforeLoadEvent, e.detail);
if (result === false) {
e.detail.url = false;
}
}, true);
// the extension context is unable to reach the page context,
// also this only works when Content Security Policy allows inline scripts
var tmpJS = document.createElement('script');
var tmpScript = ['(function() {',
'var block = function(u, t) {',
'var e = document.createEvent("CustomEvent"),',
'd = {url: u, type: t};',
'e.initCustomEvent("' + randEventName + '", !1, !1, d);',
'dispatchEvent(e);',
'return d.url === !1;',
'}, wo = open, xo = XMLHttpRequest.prototype.open;',
'open = function(u) {',
'return block(u, "popup") ? null : wo.apply(this, arguments);',
'};',
'XMLHttpRequest.prototype.open = function(m, u, s) {',
'return xo.apply(this, block(u, "xmlhttprequest") ? ["HEAD", u, s] : arguments);',
'};'
];
if (frameId === 0) {
tmpScript.push(
'var pS = history.pushState, rS = history.replaceState,',
'onpopstate = function(e) {',
'if (!e || e.state !== null) block(location.href, "popstate");',
'};',
'window.addEventListener("popstate", onpopstate, true);',
'history.pushState = function() {',
'var r = pS.apply(this, arguments);',
'onpopstate();',
'return r;',
'};',
'history.replaceState = function() {',
'var r = rS.apply(this, arguments);',
'onpopstate();',
'return r;',
'};'
);
}
var block = safari.self.tab.canLoad(beforeLoadEvent, {
isWhiteListed: location.href
});
if (vAPI.sitePatch && !block) {
tmpScript.push('(' + vAPI.sitePatch + ')();');
}
tmpScript.push('})();');
tmpJS.textContent = tmpScript.join('');
document.documentElement.removeChild(document.documentElement.appendChild(tmpJS));
};
document.addEventListener('DOMSubtreeModified', firstMutation, true);
/******************************************************************************/
var onContextMenu = function(e) {
var details = {
tagName: e.target.tagName.toLowerCase(),
pageUrl: location.href,
insideFrame: window !== window.top
};
details.editable = details.tagName === 'textarea' || details.tagName === 'input';
if (e.target.hasOwnProperty('checked')) {
details.checked = e.target.checked;
}
if (details.tagName === 'a') {
details.linkUrl = e.target.href;
}
if (e.target.hasOwnProperty('src')) {
details.srcUrl = e.target.src;
if (details.tagName === 'img') {
details.mediaType = 'image';
}
else if (details.tagName === 'video' || details.tagName === 'audio') {
details.mediaType = details.tagName;
}
}
safari.self.tab.setContextMenuEventUserInfo(e, details);
};
self.addEventListener('contextmenu', onContextMenu, true);
/******************************************************************************/
// 'main_frame' simulation
if (frameId === 0) {
onBeforeLoad(beforeLoadEvent, {
url: location.href,
type: 'main_frame'
});
}
/******************************************************************************/
})();
/******************************************************************************/