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util/id.lua @ 13461:c673ff1075bd
mod_posix: Move everything to util.startup
This allows greater control over the order of events.
Notably, the internal ordering between daemonization, initialization of
libunbound and setup of signal handling is sensitive.
libunbound starts a separate thread for processing DNS requests.
If this thread is started before signal handling has been set up, it
will not inherit the signal handlers and instead behave as it would have
before signal handlers were set up, i.e. cause the whole process to
immediately exit.
libunbound is usually initialized on the first DNS request, usually
triggered by an outgoing s2s connection attempt.
If daemonization happens before signals have been set up, signals may
not be processed at all.
author | Kim Alvefur <zash@zash.se> |
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date | Sat, 23 Mar 2024 20:48:19 +0100 |
parent | 12975:d10957394a3c |
rev | line source |
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util.id: New util for producing random identifiers of varying sizes
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1 -- Prosody IM |
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2 -- Copyright (C) 2008-2017 Matthew Wild |
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3 -- Copyright (C) 2008-2017 Waqas Hussain |
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4 -- Copyright (C) 2008-2017 Kim Alvefur |
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5 -- |
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6 -- This project is MIT/X11 licensed. Please see the |
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7 -- COPYING file in the source package for more information. |
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8 -- |
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9 |
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10 local s_gsub = string.gsub; |
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11 local random_bytes = require "prosody.util.random".bytes; |
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12 local base64_encode = require "prosody.util.encodings".base64.encode; |
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13 |
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14 local b64url = { ["+"] = "-", ["/"] = "_", ["="] = "" }; |
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15 local function b64url_random(len) |
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16 return (s_gsub(base64_encode(random_bytes(len)), "[+/=]", b64url)); |
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17 end |
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18 |
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19 return { |
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20 -- sizes divisible by 3 fit nicely into base64 without padding== |
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21 |
12111 | 22 -- for short lived things with low risk of collisions |
23 tiny = function() return b64url_random(3); end; | |
24 | |
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25 -- close to 8 bytes, should be good enough for relatively short lived or uses |
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26 -- scoped by host or users, half the size of an uuid |
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27 short = function() return b64url_random(9); end; |
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28 |
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29 -- more entropy than uuid at 2/3 the size |
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30 -- should be okay for globally scoped ids or security token |
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31 medium = function() return b64url_random(18); end; |
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32 |
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33 -- as long as an uuid but MOAR entropy |
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34 long = function() return b64url_random(27); end; |
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35 |
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36 -- pick your own adventure |
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37 custom = function (size) |
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38 return function () return b64url_random(size); end; |
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39 end; |
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40 } |