Freshdesk Single Sign On URL - Node.js

freshdesk_sso.js

	
	var crypto = require('crypto');

	/**
	 * Generates and returns a Freshdesk Single Sign On URL
	 * {@link https://gist.github.com/derekseymour/26a6fe573c1274642976 Gist}
	 *
	 * @author Derek Seymour <derek@rocketideas.com>
	 * @param {String} name - The name of the user logging in.
	 * @param {String} email - A valid email address to associate with the user.
	 * @param {String} [redirect_to] - An optional URL to redirect to after logging in.
	 * @returns {String} Freshdesk SSO URL.
	 */
	function getSSOUrl(name, email, redirect_to) {
		var freshdesk_secret = '____Place your Single Sign On Shared Secret here____';
		var freshdesk_base_url = 'http://{{your-account}}.freshdesk.com';

		var timestamp = Math.floor(new Date().getTime() / 1000).toString();
		var hmac = crypto.createHmac('md5', freshdesk_secret);
		hmac.update(name + email + timestamp);
		var hash = hmac.digest('hex');
		return freshdesk_base_url + '/login/sso/' +
			'?name=' + escape(name) +
			'&email=' + escape(email) +
			'&timestamp=' + escape(timestamp) +
			'&hash=' + escape(hash) +
			( typeof(redirect_to) === 'string' ? '&redirect_to=' + escape(redirect_to) : '' );
	}

	// Example
	console.log(getSSOUrl('John Smith', 'user@example.com'));	// Under express, use something like res.redirect(getSSOUrl('Name', 'email'));

actually, the secret is missing according to the documentation:
hmac.update(name + freshdesk_secret + email + timestamp);