require "util.datamanager"

local datamanager = datamanager;

local log = require "util.logger".init("usermanager");

local error = error;

local hashes = require "util.hashes";

module "usermanager"

function validate_credentials(host, username, password, method)

	log("debug", "User '%s' is being validated", username);

	local credentials = datamanager.load(username, host, "accounts") or {};

	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

	-- make credentials md5

	local pwd = credentials.password;

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

	-- make password md5

	if method == "PLAIN" then

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

	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

end

function user_exists(username, host)

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

end

function create_user(username, password, host)

	return datamanager.store(username, host, "accounts", {password = password});

end

function get_supported_methods(host)

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

	methods["DIGEST-MD5"] = true;

	return methods;

end

return _M;