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local rawget, rawset, setmetatable =
rawget, rawset, setmetatable
local str_gsub = string.gsub
local str_lower = string.lower
local _M = {
_VERSION = '0.01',
}
-- Returns an empty headers table with internalised case normalisation.
-- Supports the same cases as in ngx_lua:
--
-- headers.content_length
-- headers["content-length"]
-- headers["Content-Length"]
function _M.new(self)
local mt = {
normalised = {},
}
mt.__index = function(t, k)
local k_hyphened = str_gsub(k, "_", "-")
local matched = rawget(t, k)
if matched then
return matched
else
local k_normalised = str_lower(k_hyphened)
return rawget(t, mt.normalised[k_normalised])
end
end
-- First check the normalised table. If there's no match (first time) add an entry for
-- our current case in the normalised table. This is to preserve the human (prettier) case
-- instead of outputting lowercased header names.
--
-- If there's a match, we're being updated, just with a different case for the key. We use
-- the normalised table to give us the original key, and perorm a rawset().
mt.__newindex = function(t, k, v)
-- we support underscore syntax, so always hyphenate.
local k_hyphened = str_gsub(k, "_", "-")
-- lowercase hyphenated is "normalised"
local k_normalised = str_lower(k_hyphened)
if not mt.normalised[k_normalised] then
mt.normalised[k_normalised] = k_hyphened
rawset(t, k_hyphened, v)
else
rawset(t, mt.normalised[k_normalised], v)
end
end
return setmetatable({}, mt)
end
return _M
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