2 -- Copyright (C) 2013 Florian Zeitz
4 -- This project is MIT/X11 licensed. Please see the
5 -- COPYING file in the source package for more information.
8 local format, char = string.format, string.char;
9 local pairs, ipairs, tonumber = pairs, ipairs, tonumber;
10 local t_insert, t_concat = table.insert, table.concat;
12 local function urlencode(s)
13 return s and (s:gsub("[^a-zA-Z0-9.~_-]", function (c) return format("%%%02x", c:byte()); end));
15 local function urldecode(s)
16 return s and (s:gsub("%%(%x%x)", function (c) return char(tonumber(c,16)); end));
19 local function _formencodepart(s)
20 return s and (s:gsub("%W", function (c)
22 return format("%%%02x", c:byte());
29 local function formencode(form)
31 if form[1] then -- Array of ordered { name, value }
32 for _, field in ipairs(form) do
33 t_insert(result, _formencodepart(field.name).."=".._formencodepart(field.value));
35 else -- Unordered map of name -> value
36 for name, value in pairs(form) do
37 t_insert(result, _formencodepart(name).."=".._formencodepart(value));
40 return t_concat(result, "&");
43 local function formdecode(s)
44 if not s:match("=") then return urldecode(s); end
46 for k, v in s:gmatch("([^=&]*)=([^&]*)") do
47 k, v = k:gsub("%+", "%%20"), v:gsub("%+", "%%20");
48 k, v = urldecode(k), urldecode(v);
49 t_insert(r, { name = k, value = v });
55 local function contains_token(field, token)
56 field = ","..field:gsub("[ \t]", ""):lower()..",";
57 return field:find(","..token:lower()..",", 1, true) ~= nil;
61 urlencode = urlencode, urldecode = urldecode;
62 formencode = formencode, formdecode = formdecode;
63 contains_token = contains_token;