--- Prosody IM v0.4
--- Copyright (C) 2008-2009 Matthew Wild
--- Copyright (C) 2008-2009 Waqas Hussain
---
+-- Prosody IM
+-- Copyright (C) 2008-2010 Matthew Wild
+-- Copyright (C) 2008-2010 Waqas Hussain
+--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
+local random = require "util.random";
+local random_bytes = random.bytes;
+local hex = require "util.hex".to;
+local m_ceil = math.ceil;
-local m_random = math.random;
-local tostring = tostring;
-local os_time = os.time;
-local os_clock = os.clock;
-local sha1 = require "util.hashes".sha1;
-
-module "uuid"
-
-local last_uniq_time = 0;
-local function uniq_time()
- local new_uniq_time = os_time();
- if last_uniq_time >= new_uniq_time then new_uniq_time = last_uniq_time + 1; end
- last_uniq_time = new_uniq_time;
- return new_uniq_time;
+local function get_nibbles(n)
+ return hex(random_bytes(m_ceil(n/2))):sub(1, n);
end
-local function new_random(x)
- return sha1(x..os_clock()..tostring({}), true);
+local function get_twobits()
+ return ("%x"):format(get_nibbles(1):byte() % 4 + 8);
end
-function generate()
- return new_random(uniq_time());
+local function generate()
+ -- generate RFC 4122 complaint UUIDs (version 4 - random)
+ return get_nibbles(8).."-"..get_nibbles(4).."-4"..get_nibbles(3).."-"..(get_twobits())..get_nibbles(3).."-"..get_nibbles(12);
end
-return _M;
+return {
+ get_nibbles=get_nibbles;
+ generate = generate ;
+ -- COMPAT
+ seed = random.seed;
+};