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/** \file
* \brief Main script launched when a page is being loaded by a browser
*
* \author Copyright (C) 2020 Libor Polcak
* \author Copyright (C) 2021 Matus Svancar
* \author Copyright (C) 2021 Giorgio Maone
* \author Copyright (C) 2021 Marek Salon
* \author Copyright (C) 2023 Martin Zmitko
*
* \license SPDX-License-Identifier: GPL-3.0-or-later
*/
//
// 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 <https://www.gnu.org/licenses/>.
//
var wrappersPort;
var pageConfiguration = null;
function wrapWindow(currentLevel, fpdWrappers, wrappersConf) {
const code = fp_assemble_injection(currentLevel, fpdWrappers, `
init(${JSON.stringify(wrappersConf)});
`);
return patchWindow(code);
}
function configureInjection({currentLevel, fpdWrappers, fpdTrackCallers, domainHash, incognitoHash, portId}) {
if (pageConfiguration) return; // one shot
pageConfiguration = {currentLevel};
if (browser.extension.inIncognitoContext) {
domainHash = incognitoHash;
}
try {
const wrappersConf = {
fpdTrackCallers,
domainHash,
};
wrappersPort = portId ? patchWindow({portId}) : wrapWindow(currentLevel, fpdWrappers, wrappersConf);
// initialize in case the userScript API already injected
wrappersPort.postMessage(wrappersConf);
wrappersPort.onMessage = msg => {
if (msg.wrapperName) {
let {wrapperName, wrapperType, wrapperArgs, stack} = msg;
// pass access logs to FPD background script
browser.runtime.sendMessage({
purpose: "fp-detection",
resource: wrapperName,
type: wrapperType,
args: wrapperArgs,
stack: stack,
});
}
if (msg.init) {
// initialize on late demand
return wrappersConf;
}
}
return true;
} catch (e) {
console.error(e, "Trying to initialize wrappers.");
}
return false;
}
/**
* See https://pagure.io/JShelter/paper2022/c/a7e7e88edecfa19c3a52542b553bf1dc9b4388a9?branch=cnil,
* https://pagure.io/JShelter/webextension/issue/70 and
* https://pagure.io/JShelter/webextension/issue/46#comment-793783
* for more information on the early injection mechanism.
*/
if ("configuration" in window) {
configureInjection(configuration);
} else if ("sendSyncMessage" in browser.runtime) { // not in mv3 chrome
/// Get current level configuration from the background script
configureInjection(browser.runtime.sendSyncMessage({
message: "get wrapping for URL",
url: window.location.href
}
));
}
/**
* Event listener that listens for background script messages.
*
* \param callback Function that clears certain storage facilities.
*/
browser.runtime.onMessage.addListener(function (message) {
if (message.cleanStorage) {
localStorage.clear();
sessionStorage.clear();
window.name = "";
if (!message.ignoreWorkaround) {
// clear indexedDB (only Chrome)
if (window.indexedDB && indexedDB.databases) {
indexedDB.databases().then(dbs => {
dbs.forEach(db => indexedDB.deleteDatabase(db.name))
}).catch(err => console.error(err));
}
// clear cacheStorage
if (window.caches) {
caches.keys().then((names) => {
for (let name of names) {
caches.delete(name);
}
}).catch(err => console.error(err));
}
// clear cookies (only JS)
// Source: https://stackoverflow.com/a/66698063/17661959
document.cookie.replace(
/(?<=^|;).+?(?=\=|;|$)/g,
name => location.hostname
.split(/\.(?=[^\.]+\.)/)
.reduceRight((acc, val, i, arr) => i ? arr[i]='.'+val+acc : (arr[i]='', arr), '')
.map(domain => document.cookie=`${name}=;${location.protocol == 'https:' ? 'Secure;' : ''}max-age=0;path=/;domain=${domain}`)
);
}
// clear storages of all injected windows (using BrowsingData)
browser.runtime.sendMessage({
purpose: "fpd-clear-storage",
url: window.location.href
});
}
});
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