License Server Setup

const crypto = require('crypto');

// Get secret from https://dash.gumlet.com/developer/drm-credentials
let signSecret = '<proxy secret>';

// Replace orgId and assetId with actual values
const orgId = 'myorg';
const assetId = 'myasset';
let stringToSign = `/${orgId}/${assetId}`;

const signSecretB64 = Buffer.from(signSecret, 'base64');

// expiration time in seconds
let tokenlifetime = 300;

const expires = Math.round(Date.now() + tokenlifetime*1000)

const queryparams = {
  expires
	// if you are using more parameters, add here. Reference is in the table after this code block.
};

const stringForTokenGeneration = `${stringToSign}?` + (new URLSearchParams(queryparams)).toString();

const token = crypto.createHmac('sha1', signSecretB64).update(stringForTokenGeneration).digest('hex');

// you can now use token and expires variables to append to license server URLs.
console.log('Expires:', expires);
console.log('Token:', token);

// Widevine
console.log(`https://widevine.gumlet.com/licence/${orgId}/${assetId}?token=${token}&expires=${expires}`)

// FairPlay
console.log(`https://fairplay.gumlet.com/licence/${orgId}/${assetId}?token=${token}&expires=${expires}`)
// Fairplay Certificate URL
console.log(`https://fairplay.gumlet.com/certificate/${orgId}/`)

<?php

// Replace orgId and assetId with correct values
$orgId = '<myorgid>';
$assetId = '<myassetid>';

$stringToSign = '/' . $orgId . '/' . $assetId;

// Get secret from https://dash.gumlet.com/developer/drm-credentials
$signSecret = '<sign secret>';

// Decode the base64 secret
$signSecret = base64_decode($signSecret, true);

// expiration time in seconds
$tokenLifetime = 300;

$nowMs = (int) round(microtime(true) * 1000);
$expires = (int) round($nowMs + $tokenLifetime * 1000);

$queryparams = [
    'expires' => $expires,
];

$pathAndQuery = $stringToSign. '?' . http_build_query($queryparams);

$token = hash_hmac('sha1', $pathAndQuery, $signSecret, false);

// Now you can use $token and $expires and append to license server URLs

// Widevine
echo 'https://widevine.gumlet.com/licence/' . $orgId . '/' . $assetId . '?expires=' . $expires . '&token=' . $token;

// FairPlay
echo 'https://fairplay.gumlet.com/licence/' . $orgId . '/' . $assetId . '?expires=' . $expires . '&token=' . $token;
// FairPlay Certificate URL
echo 'https://fairplay.gumlet.com/certificate/' . $orgId . '/';