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----------------------------------------------------------------------------
-- Utility functions for encoding/decoding of URLs.
--
-- @release $Id: urlcode.lua,v 1.10 2008/01/21 16:11:32 carregal Exp $
----------------------------------------------------------------------------
module('nginx.urlcode', package.seeall)
----------------------------------------------------------------------------
-- Decode an URL-encoded string (see RFC 2396)
----------------------------------------------------------------------------
function unescape (str)
str = string.gsub (str, "+", " ")
str = string.gsub (str, "%%(%x%x)", function(h) return string.char(tonumber(h,16)) end)
str = string.gsub (str, "\r\n", "\n")
return str
end
----------------------------------------------------------------------------
-- URL-encode a string (see RFC 2396)
----------------------------------------------------------------------------
function escape (str)
str = string.gsub (str, "\n", "\r\n")
str = string.gsub (str, "([^0-9a-zA-Z ])", -- locale independent
function (c) return string.format ("%%%02X", string.byte(c)) end)
str = string.gsub (str, " ", "+")
return str
end
----------------------------------------------------------------------------
-- Insert a (name=value) pair into table [[args]]
-- @param args Table to receive the result.
-- @param name Key for the table.
-- @param value Value for the key.
-- Multi-valued names will be represented as tables with numerical indexes
-- (in the order they came).
----------------------------------------------------------------------------
function insertfield (args, name, value)
if not args[name] then
args[name] = value
else
local t = type (args[name])
if t == "string" then
args[name] = {
args[name],
value,
}
elseif t == "table" then
table.insert (args[name], value)
else
error ("CGILua fatal error (invalid args table)!")
end
end
end
----------------------------------------------------------------------------
-- Parse url-encoded request data
-- (the query part of the script URL or url-encoded post data)
--
-- Each decoded (name=value) pair is inserted into table [[args]]
-- @param query String to be parsed.
-- @param args Table where to store the pairs.
----------------------------------------------------------------------------
function parsequery (query, args)
if type(query) == "string" then
local insertfield, unescape = insertfield, unescape
string.gsub (query, "([^&=]+)=([^&=]*)&?",
function (key, val)
insertfield (args, unescape(key), unescape(val))
end)
end
end
----------------------------------------------------------------------------
-- URL-encode the elements of a table creating a string to be used in a
-- URL for passing data/parameters to another script
-- @param args Table where to extract the pairs (name=value).
-- @return String with the resulting encoding.
----------------------------------------------------------------------------
function encodetable (args)
if args == nil or next(args) == nil then -- no args or empty args?
return ""
end
local strp = ""
for key, vals in pairs(args) do
if type(vals) ~= "table" then
vals = {vals}
end
for i,val in ipairs(vals) do
strp = strp.."&"..escape(key).."="..escape(val)
end
end
-- remove first &
return string.sub(strp,2)
end
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