41 lines
1.2 KiB
Lua
41 lines
1.2 KiB
Lua
local _M = {}
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-- utility function for checking if table is empty
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function _M.is_table_empty(check)
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-- bind next to local variable to achieve ultimate efficiency
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-- https://stackoverflow.com/a/1252776
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local next = next
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return next(check) == nil
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end
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-- extract full cookie name and value by its name from cookie string
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-- note: name matcher argument is a pattern so you will need to escape
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-- any special characters, read more https://www.lua.org/pil/20.2.html
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function _M.extract_cookie(cookie_string, name_matcher)
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if cookie_string == nil then return nil end -- nil safeguard
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local start, stop = string.find(cookie_string, name_matcher .. "=[^;]+")
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if start then
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return string.sub(cookie_string, start, stop)
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end
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return nil
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end
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-- extract just the cookie value by its name from cookie string
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-- note: name matcher argument is a pattern so you will need to escape
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-- any special characters, read more https://www.lua.org/pil/20.2.html
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function _M.extract_cookie_value(cookie_string, name_matcher)
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local cookie = _M.extract_cookie(cookie_string, name_matcher)
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if cookie == nil then return nil end
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local value_start = string.find(cookie, "=") + 1
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return string.sub(cookie, value_start)
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end
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return _M
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