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const crypto = require('crypto');

const generateToken = (streamKey, userIp) => {
    const key = process.env.FLI_KEY; // The key from flussonic.conf file. KEEP IT IN SECRET.
    const lifetime = 3600 * 3; // The link will become invalid in 3 hours.

    const ipaddr = userIp; // (v20.07) Set ipaddr = 'no_check_ip' if you want to exclude IP address of client devices from checking.
    const desync = 300; // Allowed time desync between Flussonic and hosting servers in seconds.
    const starttime = Math.floor(Date.now() / 1000) - desync;
    const endtime = starttime + lifetime;
    const salt = crypto.randomBytes(16).toString('hex');

    const hashsrt = streamKey + ipaddr + starttime + endtime + key + salt;
    const hash = crypto.createHash('sha1').update(hashsrt).digest('hex');

    const token = `${hash}-${salt}-${endtime}-${starttime}&remote=${ipaddr}`;
    return token;
};

module.exports = {
    generateToken
};