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headers.lua
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237 lines (206 loc) · 4.88 KB
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--[[
HTTP Header data structure/type
Design criteria:
- the same header field is allowed more than once
- must be able to fetch seperate occurences (important for some headers e.g. Set-Cookie)
- optionally available as comma seperated list
- http2 adds flag to headers that they should never be indexed
- header order should be recoverable
I chose to implement headers as an array of entries.
An index of field name => array indices is kept.
]]
local unpack = table.unpack or unpack -- luacheck: ignore 113 143
local entry_methods = {}
local entry_mt = {
__name = "http.headers.entry";
__index = entry_methods;
}
local never_index_defaults = {
authorization = true;
["proxy-authorization"] = true;
cookie = true;
["set-cookie"] = true;
}
local function new_entry(name, value, never_index)
if never_index == nil then
never_index = never_index_defaults[name] or false
end
return setmetatable({
name = name;
value = value;
never_index = never_index;
}, entry_mt)
end
function entry_methods:modify(value, never_index)
self.value = value
if never_index == nil then
never_index = never_index_defaults[self.name] or false
end
self.never_index = never_index
end
function entry_methods:unpack()
return self.name, self.value, self.never_index
end
function entry_methods:clone()
return new_entry(self.name, self.value, self.never_index)
end
local headers_methods = {}
local headers_mt = {
__name = "http.headers";
__index = headers_methods;
}
local function new_headers()
return setmetatable({
_n = 0;
_data = {};
_index = {};
}, headers_mt)
end
function headers_methods:len()
return self._n
end
headers_mt.__len = headers_methods.len
function headers_mt:__tostring()
return string.format("http.headers{%d headers}", self._n)
end
local function add_to_index(_index, name, i)
local dex = _index[name]
if dex == nil then
dex = {n=1, i}
_index[name] = dex
else
local n = dex.n + 1
dex[n] = i
dex.n = n
end
end
local function rebuild_index(self)
local index = {}
for i=1, self._n do
local entry = self._data[i]
add_to_index(index, entry.name, i)
end
self._index = index
end
function headers_methods:clone()
local index, new_data = {}, {}
for i=1, self._n do
local entry = self._data[i]
new_data[i] = entry:clone()
add_to_index(index, entry.name, i)
end
return setmetatable({
_n = self._n;
_data = new_data;
_index = index;
}, headers_mt)
end
function headers_methods:append(name, ...)
local n = self._n + 1
self._data[n] = new_entry(name, ...)
add_to_index(self._index, name, n)
self._n = n
end
function headers_methods:each()
local i = 0
return function(self) -- luacheck: ignore 432
if i >= self._n then return end
i = i + 1
local entry = self._data[i]
return entry:unpack()
end, self
end
headers_mt.__pairs = headers_methods.each
function headers_methods:has(name)
local dex = self._index[name]
return dex ~= nil
end
function headers_methods:delete(name)
local dex = self._index[name]
if dex then
local n = dex.n
for i=n, 1, -1 do
table.remove(self._data, dex[i])
end
self._n = self._n - n
rebuild_index(self)
return true
else
return false
end
end
function headers_methods:geti(i)
local e = self._data[i]
if e == nil then return nil end
return e:unpack()
end
function headers_methods:get_as_sequence(name)
local dex = self._index[name]
if dex == nil then return { n = 0; } end
local r = { n = dex.n; }
for i=1, r.n do
r[i] = self._data[dex[i]].value
end
return r
end
function headers_methods:get(name)
local r = self:get_as_sequence(name)
return unpack(r, 1, r.n)
end
function headers_methods:get_comma_separated(name)
local r = self:get_as_sequence(name)
if r.n == 0 then
return nil
else
return table.concat(r, ",", 1, r.n)
end
end
function headers_methods:modifyi(i, ...)
local e = self._data[i]
if e == nil then error("invalid index") end
e:modify(...)
end
function headers_methods:upsert(name, ...)
local dex = self._index[name]
if dex == nil then
self:append(name, ...)
else
assert(dex[2] == nil, "Cannot upsert multi-valued field")
self:modifyi(dex[1], ...)
end
end
local function default_cmp(a, b)
if a.name ~= b.name then
-- Things with a colon *must* be before others
local a_is_colon = a.name:sub(1,1) == ":"
local b_is_colon = b.name:sub(1,1) == ":"
if a_is_colon and not b_is_colon then
return true
elseif not a_is_colon and b_is_colon then
return false
else
return a.name < b.name
end
end
if a.value ~= b.value then
return a.value < b.value
end
return a.never_index
end
function headers_methods:sort()
table.sort(self._data, default_cmp)
rebuild_index(self)
end
function headers_methods:dump(file, prefix)
file = file or io.stderr
prefix = prefix or ""
for name, value in self:each() do
assert(file:write(string.format("%s%s: %s\n", prefix, name, value)))
end
assert(file:flush())
end
return {
new = new_headers;
methods = headers_methods;
mt = headers_mt;
}