local error = error;

local hashes = require "util.hashes";

function validate_credentials(host, username, password, method)

	if method == nil then method = "PLAIN"; end

	if method == "PLAIN" and credentials.password then -- PLAIN, do directly

		if password == credentials.password then

			return true;

		else

			return nil, "Auth failed. Invalid username or password.";

		end

	end

	-- must do md5

	if not hashes.md5 then

		return nil, "Server misconfiguration, the md5 library is not available.";

	end

	-- make credentials md5

	local pwd = credentials.password;

	if not pwd then pwd = credentials.md5; else pwd = hashes.md5(pwd); end

	-- make password md5

	if method == "PLAIN" then

		password = hashes.md5(password or "");

	elseif method ~= "DIGEST-MD5" then

		return nil, "Unsupported auth method";

	end

	-- compare

	if password == pwd then

		return true;

	else

		return nil, "Auth failed. Invalid username or password.";

	end

	return datamanager.load(username, host, "accounts") ~= nil; -- FIXME also check for empty credentials

function get_supported_methods(host)

	local methods = {["PLAIN"] = true}; -- TODO this should be taken from the config

	if hashes.md5 then

		methods["DIGEST-MD5"] = true;

	end

	return methods;

end

return _M;