Why os.date() and table.concat() is not safe function

[GYWang1983]

-- Safe packages/functions below

kong/kong/tools/kong-lua-sandbox.lua

Line 73 in 4f5b85d

os.clock os.difftime os.time

os.date is useful for formatting timestamp to date string in http headers

kong/kong/tools/kong-lua-sandbox.lua

Line 79 in 4f5b85d

table.insert table.maxn table.remove table.sort

Use table.concat instead of .. is best practice in openresty, and there have been too many codes use the function to concat string in pre-function or post-function

[kikito]

Thanks for this report. I have studied both functions and I see no reason why they should be blocked by the sandbox. I have created a PR for including those #8081