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-- Prosody IM
-- Copyright (C) 2013 Florian Zeitz
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
local format, char = string.format, string.char;
local pairs, ipairs = pairs, ipairs;
local t_insert, t_concat = table.insert, table.concat;
local url_codes = {};
for i = 0, 255 do
local c = char(i);
local u = format("%%%02x", i);
url_codes[c] = u;
url_codes[u] = c;
url_codes[u:upper()] = c;
end
local function urlencode(s)
return s and (s:gsub("[^a-zA-Z0-9.~_-]", url_codes));
end
local function urldecode(s)
return s and (s:gsub("%%%x%x", url_codes));
end
local function _formencodepart(s)
return s and (urlencode(s):gsub("%%20", "+"));
end
local function formencode(form)
local result = {};
if form[1] then -- Array of ordered { name, value }
for _, field in ipairs(form) do
t_insert(result, _formencodepart(field.name).."=".._formencodepart(field.value));
end
else -- Unordered map of name -> value
for name, value in pairs(form) do
t_insert(result, _formencodepart(name).."=".._formencodepart(value));
end
end
return t_concat(result, "&");
end
local function formdecode(s)
if not s:match("=") then return urldecode(s); end
local r = {};
for k, v in s:gmatch("([^=&]*)=([^&]*)") do
k, v = k:gsub("%+", "%%20"), v:gsub("%+", "%%20");
k, v = urldecode(k), urldecode(v);
t_insert(r, { name = k, value = v });
r[k] = v;
end
return r;
end
local function contains_token(field, token)
field = ","..field:gsub("[ \t]", ""):lower()..",";
return field:find(","..token:lower()..",", 1, true) ~= nil;
end
local function normalize_path(path, is_dir)
if is_dir then
if path:sub(-1,-1) ~= "/" then path = path.."/"; end
else
if path:sub(-1,-1) == "/" then path = path:sub(1, -2); end
end
if path:sub(1,1) ~= "/" then path = "/"..path; end
return path;
end
--- Parse the RFC 7239 Forwarded header into array of key-value pairs.
local function parse_forwarded(forwarded)
if type(forwarded) ~= "string" then
return nil;
end
local fwd = {}; -- array
local cur = {}; -- map, to which we add the next key-value pair
for key, quoted, value, delim in forwarded:gmatch("(%w+)%s*=%s*(\"?)([^,;\"]+)%2%s*(.?)") do
-- FIXME quoted quotes like "foo\"bar"
-- unlikely when only dealing with IP addresses
if quoted == '"' then
value = value:gsub("\\(.)", "%1");
end
cur[key:lower()] = value;
if delim == "" or delim == "," then
t_insert(fwd, cur)
if delim == "" then
-- end of the string
break;
end
cur = {};
elseif delim ~= ";" then
-- misparsed
return false;
end
end
return fwd;
end
return {
urlencode = urlencode, urldecode = urldecode;
formencode = formencode, formdecode = formdecode;
contains_token = contains_token;
normalize_path = normalize_path;
parse_forwarded = parse_forwarded;
};
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