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/*
* This file is part of Privacy Badger <https://www.eff.org/privacybadger>
* Copyright (C) 2014 Electronic Frontier Foundation
*
* Privacy Badger is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* Privacy Badger 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 Privacy Badger. If not, see <http://www.gnu.org/licenses/>.
*/
(function () {
// don't inject into non-HTML documents (such as XML documents)
// but do inject into XHTML documents
if (document instanceof HTMLDocument === false && (
document instanceof XMLDocument === false ||
document.createElement('div') instanceof HTMLDivElement === false
)) {
return;
}
// don't bother asking to run when trivially in first-party context
if (window.top == window) {
return;
}
// TODO race condition; fix waiting on https://crbug.com/478183
chrome.runtime.sendMessage({
type: "checkLocation",
frameUrl: window.FRAME_URL
}, function (blocked) {
if (blocked) {
// https://stackoverflow.com/questions/49092423/how-to-break-on-localstorage-changes
var code =
'('+ function() {
/*
* If localStorage is inaccessible, such as when "Block third-party cookies"
* in enabled in Chrome or when `dom.storage.enabled` is set to `false` in
* Firefox, do not go any further.
*/
try {
// No localStorage raises an Exception in Chromium-based browsers, while
// it's equal to `null` in Firefox.
if (null === localStorage) {
throw false;
}
} catch (ex) {
return;
}
let lsProxy = new Proxy(localStorage, {
set: function (/*ls, prop, value*/) {
return true;
},
get: function (ls, prop) {
if (typeof ls[prop] == 'function') {
let fn = function () {};
if (prop == 'getItem' || prop == 'key') {
fn = function () { return null; };
}
return fn.bind(ls);
} else {
if (prop == 'length') {
return 0;
} else if (prop == '__proto__') {
return lsProxy;
}
return;
}
}
});
Object.defineProperty(window, 'localStorage', {
configurable: true,
enumerable: true,
value: lsProxy
});
} +')()';
window.injectScript(code);
}
return true;
});
}());
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