Donovan Graham donovan-graham

Sublime Text 2 – Useful Shortcuts (Mac OS X)

	/*

	This example shows how you can use your data structure as a basis for
	your Firebase security rules to implement role-based security. We store
	each user by their Twitter uid, and use the following simplistic approach
	for user roles:

	0 - GUEST
	10 - USER
	20 - MODERATOR

	/**
	* Fancy ID generator that creates 20-character string identifiers with the following properties:
	*
	* 1. They're based on timestamp so that they sort after any existing ids.
	* 2. They contain 72-bits of random data after the timestamp so that IDs won't collide with other clients' IDs.
	* 3. They sort lexicographically (so the timestamp is converted to characters that will sort properly).
	* 4. They're monotonically increasing. Even if you generate more than one in the same timestamp, the
	* latter ones will sort after the former ones. We do this by using the previous random bits
	* but "incrementing" them by 1 (only in the case of a timestamp collision).
	*/