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