const {createHash} = require("crypto");
const numbertobuffer = (number)=>{
    const hexstr = number.toString(16);
    return Buffer.from((hexstr.length%2==0?"":"0")+hexstr, "hex")
}
const generateUID = (empty=false)=>{
    const nowbuff = numbertobuffer(empty?0:Date.now());
    const hash = createHash("sha1");
    hash.update(nowbuff);
    return hash.digest().toString("base64url").toUpperCase();
}
module.exports = generateUID