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util.id: Adjust entropy levels, with rationales

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Modules using ids for logging should not need the now pretty large
medium one.
This commit is contained in:
Kim Alvefur 2021-12-02 01:14:55 +01:00
parent 5797a3f65d
commit a3ea469ed9
4 changed files with 17 additions and 6 deletions
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2
net/server_epoll.lua
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@ -26,7 +26,7 @@ local createtable = require "util.table".create;
local inet = require "util.net";
local inet_pton = inet.pton;
local _SOCKETINVALID = socket._SOCKETINVALID or -1;
local new_id = require "util.id".medium;
local new_id = require "util.id".short;
local xpcall = require "util.xpcall".xpcall;
local poller = require "util.poll"

2
net/unbound.lua
View file

@ -18,7 +18,7 @@ local log = logger.init("unbound");
local net_server = require "net.server";
local libunbound = require"lunbound";
local promise = require"util.promise";
local new_id = require "util.id".medium;
local new_id = require "util.id".short;
local gettime = require"socket".gettime;
local dns_utils = require"util.dns";

2
plugins/mod_scansion_record.lua
View file

@ -8,7 +8,7 @@ local dt = require "util.datetime";
local dm = require "util.datamanager";
local st = require "util.stanza";
local record_id = id.medium():lower();
local record_id = id.short():lower();
local record_date = os.date("%Y%b%d"):lower();
local header_file = dm.getpath(record_id, "scansion", record_date, "scs", true);
local record_file = dm.getpath(record_id, "scansion", record_date, "log", true);

17
util/id.lua
View file

@ -17,9 +17,20 @@ local function b64url_random(len)
end
return {
short = function () return b64url_random(6); end;
medium = function () return b64url_random(12); end;
long = function () return b64url_random(24); end;
-- sizes divisible by 3 fit nicely into base64 without padding==
-- close to 8 bytes, should be good enough for relatively short lived or uses
-- scoped by host or users, half the size of an uuid
short = function() return b64url_random(9); end;
-- more entropy than uuid at 2/3 the size
-- should be okay for globally scoped ids or security token
medium = function() return b64url_random(18); end;
-- as long as an uuid but MOAR entropy
long = function() return b64url_random(27); end;
-- pick your own adventure
custom = function (size)
return function () return b64url_random(size); end;
end;