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Check if candidate uuid does not already exist before returning it

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Athozus 2024-03-30 21:13:45 +01:00
parent f57473abd0
commit 1c57939c79
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1 changed files with 30 additions and 5 deletions
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27
util/uuid.lua
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@ -1,9 +1,34 @@
-- source: https://gist.github.com/jrus/3197011
local random = math.random
local function is_uuid_unexisting(uuid)
for p, _ in minetest.get_auth_handler().iterate() do
local e = mail.get_storage_entry(p)
for _, m in ipairs(e.inbox) do
if m.id == uuid then return false end
end
for _, m in ipairs(e.outbox) do
if m.id == uuid then return false end
end
for _, m in ipairs(e.drafts) do
if m.id == uuid then return false end
end
for _, m in ipairs(e.trash) do
if m.id == uuid then return false end
end
end
return true
end
function mail.new_uuid()
local template ='xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'
return string.gsub(template, '[xy]', function (c)
local candidate_uuid = ""
repeat
candidate_uuid = string.gsub(template, '[xy]',
function (c)
local v = (c == 'x') and random(0, 0xf) or random(8, 0xb)
return string.format('%x', v)
end)
until is_uuid_unexisting(candidate_uuid)
return candidate_uuid
end