mod_adhoc: Add support for commands only executable by global administrators

[prosody.git] / util / uuid.lua

diff --git a/util/uuid.lua b/util/uuid.lua
index 0b8526f905ea987ce69285ff852b66e6c5ff8119..796c8ee4c47247dd049e6bb3561ab5223ced74bc 100644 (file)
--- a/util/uuid.lua
+++ b/util/uuid.lua
@@ -1,29 +1,50 @@
--- Prosody IM v0.2
--- Copyright (C) 2008 Matthew Wild
--- Copyright (C) 2008 Waqas Hussain
+-- Prosody IM
+-- Copyright (C) 2008-2010 Matthew Wild
+-- Copyright (C) 2008-2010 Waqas Hussain
 -- 
--- This program is free software; you can redistribute it and/or
--- modify it under the terms of the GNU General Public License
--- as published by the Free Software Foundation; either version 2
--- of the License, or (at your option) any later version.
--- 
--- This program is distributed in the hope that it will be useful,
--- but WITHOUT ANY WARRANTY; without even the implied warranty of
--- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
--- GNU General Public License for more details.
--- 
--- You should have received a copy of the GNU General Public License
--- along with this program; if not, write to the Free Software
--- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+-- This project is MIT/X11 licensed. Please see the
+-- COPYING file in the source package for more information.
 --
 
 
-
 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;
+end
+
+local function new_random(x)
+       return sha1(x..os_clock()..tostring({}), true);
+end
+
+local buffer = new_random(uniq_time());
+local function _seed(x)
+       buffer = new_random(buffer..x);
+end
+local function get_nibbles(n)
+       if #buffer < n then _seed(uniq_time()); end
+       local r = buffer:sub(0, n);
+       buffer = buffer:sub(n+1);
+       return r;
+end
+local function get_twobits()
+       return ("%x"):format(get_nibbles(1):byte() % 4 + 8);
+end
+
 function generate()
-       return m_random(0, 99999999);
+       -- 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
+seed = _seed;
 
-return _M;
\ No newline at end of file
+return _M;