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refactor(tools/rand): speed up random string generation #13150

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refactor(tools/rand): speed up random string generation #13150

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ff8aea6
find before gsub
chronolaw Jun 4, 2024
4805bde
clean
chronolaw Jun 4, 2024
3e0a707
remove gsub for "="
chronolaw Jun 6, 2024
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17 changes: 13 additions & 4 deletions kong/tools/rand.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -120,10 +120,19 @@ do
-- get 24 bytes, which will return a 32 char string after encoding
-- this is done in attempt to maintain backwards compatibility as
-- much as possible while improving the strength of this function
return encode_base64(get_rand_bytes(24, true))
:gsub("/", char(rand(48, 57))) -- 0 - 10
:gsub("+", char(rand(65, 90))) -- A - Z
:gsub("=", char(rand(97, 122))) -- a - z
local str = encode_base64(get_rand_bytes(24, true))

if str:find("/", 1, true) then
str = str:gsub("/", char(rand(48, 57))) -- 0 - 10
end

if str:find("+", 1, true) then
str = str:gsub("+", char(rand(65, 90))) -- A - Z
end

-- no gsub for "=" since no padding

return str
end

end
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