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/*
* Copyright (C) 2021-2022 Kristóf Marussy <kristof@marussy.com>
*
* This file is part of Sophie.
*
* Sophie is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, version 3.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* SPDX-License-Identifier: AGPL-3.0-only
*/
/**
* @file Based on the javascript code snippet available at
* https://github.com/GoogleChrome/developer.chrome.com/blob/c33f7f4f2964e7deb28aee44de745c3725b70063/site/en/docs/privacy-sandbox/user-agent/snippets/index.md
*
* Used under the Apache 2.0 license according to
* https://github.com/GoogleChrome/developer.chrome.com/blob/c33f7f4f2964e7deb28aee44de745c3725b70063/LICENSE
*/
const electronUAParts = / (sophie|Electron)\/[^\s]+/g;
const chromeUAs = /^Mozilla\/5\.0 \(((?<platform>Lin|Win|Mac|X11; C|X11; L)+[^\)]+)\) AppleWebKit\/537.36 \(KHTML, like Gecko\) Chrome\/(?<major>\d+)[\d\.]+(?<mobile>[ Mobile]*) Safari\/537\.36$/;
const unifiedPlatform = {
'Lin': 'Linux; Android 10; K',
'Win': 'Windows NT 10.0; Win64; x64',
'Mac': 'Macintosh; Intel Mac OS X 10_15_7',
'X11; C': 'X11; CrOS x86_64',
'X11; L': 'X11; Linux x86_64',
};
/**
* Reduces the information exposed in the user-agent string.
*
* @param userAgent The original user-agent string.
* @returns The reduces user-agent string.
* @see https://developer.chrome.com/docs/privacy-sandbox/user-agent/
*/
export function reduceUserAgent(userAgent: string): string {
const userAgentWithoutElectron = userAgent.replaceAll(electronUAParts, '');
const matched = chromeUAs.exec(userAgentWithoutElectron) as unknown as {
groups: {
platform: 'Lin' | 'Win' | 'Mac' | 'X11; C' | 'X11; L',
major: string,
mobile: string,
}
};
if (matched) {
return `Mozilla/5.0 (${unifiedPlatform[matched.groups.platform]}) ` +
`AppleWebKit/537.36 (KHTML, like Gecko) ` +
`Chrome/${matched.groups.major}.0.0.0${matched.groups.mobile} Safari/537.36`
}
return userAgentWithoutElectron;
}
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