util/jid.lua

-- Prosody IM v0.4
-- Copyright (C) 2008-2009 Matthew Wild
-- Copyright (C) 2008-2009 Waqas Hussain
-- 
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--


local match = string.match;
local nodeprep = require "util.encodings".stringprep.nodeprep;
local nameprep = require "util.encodings".stringprep.nameprep;
local resourceprep = require "util.encodings".stringprep.resourceprep;

module "jid"

function split(jid)
	if not jid then return; end
	local node, nodepos = match(jid, "^([^@]+)@()");
	local host, hostpos = match(jid, "^([^@/]+)()", nodepos)
	if node and not host then return nil, nil, nil; end
	local resource = match(jid, "^/(.+)$", hostpos);
	if (not host) or ((not resource) and #jid >= hostpos) then return nil, nil, nil; end
	return node, host, resource;
end

function bare(jid)
	local node, host = split(jid);
	if node and host then
		return node.."@"..host;
	end
	return host;
end

function prepped_split(jid)
	local node, host, resource = split(jid);
	if host then
		host = nameprep(host);
		if not host then return; end
		if node then
			node = nodeprep(node);
			if not node then return; end
		end
		if resource then
			resource = resourceprep(resource);
			if not resource then return; end
		end
		return node, host, resource;
	end
end

function prep(jid)
	local node, host, resource = prepped_split(jid);
	if host then
		if node then
			host = node .. "@" .. host;
		end
		if resource then
			host = host .. "/" .. resource;
		end
	end
	return host;
end

return _M;