gnu-social/actions/login.php

<?php
/*
 * Laconica - a distributed open-source microblogging tool
 * Copyright (C) 2008, Controlez-Vous, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

if (!defined('LACONICA')) { exit(1); }

class LoginAction extends Action {

	function handle($args) {
		parent::handle($args);
		if (common_is_real_login()) {
			common_user_error(_t('Already logged in.'));
		} else if ($_SERVER['REQUEST_METHOD'] == 'POST') {
			$this->check_login();
		} else {
			$this->show_form();
		}
	}
	
	function check_login() {
		# XXX: form token in $_SESSION to prevent XSS
		# XXX: login throttle
		$nickname = $this->arg('nickname');
		$password = $this->arg('password');
		$user = common_check_user($nickname, $password);

		if (!$user) {
			$this->show_form(_t('Incorrect username or password.'));
			return;
		}
		
		# success!
		if (!common_set_user($user)) {
			common_server_error(_t('Error setting user.'));
			return;
		}
		
		common_real_login(true);
		
		if ($this->boolean('rememberme')) {
			common_debug('Adding rememberme cookie for ' . $nickname);
			common_rememberme($user);
		}
		# success!
		$url = common_get_returnto();
		if ($url) {
			# We don't have to return to it again
			common_set_returnto(NULL);
		} else {
			$url = common_local_url('all',
									array('nickname' =>
										  $nickname));
		}
		common_redirect($url);
	}

	function show_form($error=NULL) {
		common_show_header(_t('Login'), NULL, $error, array($this, 'show_top'));
		common_element_start('form', array('method' => 'post',
										   'id' => 'login',
										   'action' => common_local_url('login')));
		common_input('nickname', _t('Nickname'));
		common_password('password', _t('Password'));
		common_checkbox('rememberme', _t('Remember me'), false,
		                _t('Automatically login in the future; ' .
		                   'not for shared computers!'));
		common_submit('submit', _t('Login'));
		common_element_end('form');
		common_element_start('p');
		common_element('a', array('href' => common_local_url('recoverpassword')),
					   _t('Lost or forgotten password?'));
		common_element_end('p');
		common_show_footer();
	}

	function get_instructions() {
		if (common_logged_in() &&
			!common_is_real_login() &&
			common_get_returnto())
		{
			# rememberme logins have to reauthenticate before
			# changing any profile settings (cookie-stealing protection)
			return _t('For security reasons, ' . 
					  'please re-enter your ' .
					  'user name and password ' . 
  					  'before changing your settings. ');
		} else {
			return _t('Login with your username and password. ' .
					  'Don\'t have a username yet? ' .
					  '[Register](%%action.register%%) a new account, or ' .
					  'try [OpenID](%%action.openidlogin%%). ');
		}
	}

	function show_top($error=NULL) {
		if ($error) {
			common_element('p', 'error', $error);
		} else {
			$instr = $this->get_instructions();
			$output = common_markup_to_html($instr);
			common_element_start('div', 'instructions');
			common_raw($output);
			common_element_end('p');
		}
	}
}
#