-- Prosody IM

-- Copyright (C) 2008-2010 Matthew Wild

-- Copyright (C) 2008-2010 Waqas Hussain

-- Copyright (C) 2010 Jeff Mitchell

--

-- This project is MIT/X11 licensed. Please see the

-- COPYING file in the source package for more information.

--

local datamanager = require "util.datamanager";

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

local type = type;

local error = error;

local ipairs = ipairs;

local hashes = require "util.hashes";

local jid_bare = require "util.jid".bare;

local config = require "core.configmanager";

local hosts = hosts;

local prosody = _G.prosody;

function new_default_provider(host)

	local provider = { name = "default" };

	function provider.test_password(username, password)

		log("debug", "test password for user %s at host %s", username, host);

		if is_cyrus(host) then return nil, "Legacy auth not supported with Cyrus SASL."; end

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

		if password == credentials.password then

			return true;

		else

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

		end

	end

	function provider.get_password(username)

		log("debug", "get password for user %s at host %s", username, host);

		if is_cyrus(host) then return nil, "Passwords unavailable for Cyrus SASL."; end

		return (datamanager.load(username, host, "accounts") or {}).password;

	end

	function provider.set_password(username, password)

		if is_cyrus(host) then return nil, "Passwords unavailable for Cyrus SASL."; end

		local account = datamanager.load(username, host, "accounts");

		if account then

			account.password = password;

			return datamanager.store(username, host, "accounts", account);

		end

		return nil, "Account not available.";

	end

	function provider.user_exists(username)

		if is_cyrus(host) then return true; end

		local account = datamanager.load(username, host, "accounts");

		if not account then

			log("debug", "account not found for username '%s' at host '%s'", username, host);

			return nil, "Auth failed. Invalid username";

		end

		if account.password == nil or string.len(account.password) == 0 then

			log("debug", "account password not set or zero-length for username '%s' at host '%s'", username, host);

			return nil, "Auth failed. Password invalid.";

		end

		return true;

	end

	function provider.create_user(username, password)

		if is_cyrus(host) then return nil, "Account creation/modification not available with Cyrus SASL."; end

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

	end

	function provider.get_supported_methods()

		return {["PLAIN"] = true, ["DIGEST-MD5"] = true}; -- TODO this should be taken from the config

	end

	function provider.is_admin(jid)

		local admins = config.get(host, "core", "admins");

		if admins ~= config.get("*", "core", "admins") and type(admins) == "table" then

			jid = jid_bare(jid);

			for _,admin in ipairs(admins) do

				if admin == jid then return true; end

			end

		elseif admins then

			log("error", "Option 'admins' for host '%s' is not a table", host);

		end

		return is_admin(jid); -- Test whether it's a global admin instead

	end

	return provider;

end

module:add_item("auth-provider", new_default_provider(module.host));