Youtube sapisid hash gen

sapisidhashgen.js

async function generateSapisidHash(datasyncId, full = true, origin = 'https://www.youtube.com') {
	const sapisid = document.cookie.split('; ').find(cookie => cookie.startsWith('SAPISID')).split('=')[1];
	const dsid = datasyncId.split('||')[1];
	const ts = Math.floor(new Date().getTime() / 1E3);
	const input = [dsid, ts, sapisid, origin].join(' ');
	const digest = await window.crypto.subtle.digest('SHA-1', new TextEncoder('utf-8').encode(input)).then(buf => {
	    return Array.prototype.map.call(new Uint8Array(buf), x=>(('00'+x.toString(16)).slice(-2))).join('');
	});
	const hash = `${ts}_${digest}_u`;
	if(full) return `SAPISIDHASH ${hash} SAPISID1PHASH ${hash} SAPISID3PHASH ${hash}`;
	return hash;
}