fluxer/fluxer_app/pkgs/livekit-client/src/utils/browserParser.ts

// SPDX-FileCopyrightText: 2024 LiveKit, Inc.
//
// SPDX-License-Identifier: Apache-2.0
const commonVersionIdentifier = /version\/(\d+(\.?_?\d+)+)/i;

export type DetectableBrowser = 'Chrome' | 'Firefox' | 'Safari';
export type DetectableOS = 'iOS' | 'macOS';

export type BrowserDetails = {
	name: DetectableBrowser;
	version: string;
	os?: DetectableOS;
	osVersion?: string;
};

let browserDetails: BrowserDetails | undefined;

export function getBrowser(userAgent?: string, force = true): BrowserDetails | undefined {
	if (typeof userAgent === 'undefined' && typeof navigator === 'undefined') {
		return;
	}
	const ua = (userAgent ?? navigator.userAgent).toLowerCase();
	if (browserDetails === undefined || force) {
		const browser = browsersList.find(({test}) => test.test(ua));
		browserDetails = browser?.describe(ua);
	}
	return browserDetails;
}

const browsersList = [
	{
		test: /firefox|iceweasel|fxios/i,
		describe(ua: string) {
			const browser: BrowserDetails = {
				name: 'Firefox',
				version: getMatch(/(?:firefox|iceweasel|fxios)[\s/](\d+(\.?_?\d+)+)/i, ua),
				os: ua.toLowerCase().includes('fxios') ? 'iOS' : undefined,
				osVersion: getOSVersion(ua),
			};
			return browser;
		},
	},
	{
		test: /chrom|crios|crmo/i,
		describe(ua: string) {
			const browser: BrowserDetails = {
				name: 'Chrome',
				version: getMatch(/(?:chrome|chromium|crios|crmo)\/(\d+(\.?_?\d+)+)/i, ua),
				os: ua.toLowerCase().includes('crios') ? 'iOS' : undefined,
				osVersion: getOSVersion(ua),
			};

			return browser;
		},
	},
	{
		test: /safari|applewebkit/i,
		describe(ua: string) {
			const browser: BrowserDetails = {
				name: 'Safari',
				version: getMatch(commonVersionIdentifier, ua),
				os: ua.includes('mobile/') ? 'iOS' : 'macOS',
				osVersion: getOSVersion(ua),
			};

			return browser;
		},
	},
];

function getMatch(exp: RegExp, ua: string, id = 1) {
	const match = ua.match(exp);
	return (match && match.length >= id && match[id]) || '';
}

function getOSVersion(ua: string) {
	return ua.includes('mac os') ? getMatch(/\(.+?(\d+_\d+(:?_\d+)?)/, ua, 1).replace(/_/g, '.') : undefined;
}