<?php
/**
 * @package     Joomla.Plugin
 * @subpackage  User.joomla
 *
 * @copyright   Copyright (C) 2005 - 2019 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('_JEXEC') or die;

use Joomla\CMS\Component\ComponentHelper;
use Joomla\CMS\Factory;
use Joomla\CMS\Language\Text;
use Joomla\CMS\Uri\Uri;
use Joomla\CMS\User\User;
use Joomla\CMS\User\UserHelper;
use Joomla\Registry\Registry;

/**
 * Joomla User plugin
 *
 * @since  1.5
 */
class PlgUserJoomla extends JPlugin
{
	/**
	 * Application object
	 *
	 * @var    JApplicationCms
	 * @since  3.2
	 */
	protected $app;

	/**
	 * Database object
	 *
	 * @var    JDatabaseDriver
	 * @since  3.2
	 */
	protected $db;

	/**
	 * Remove all sessions for the user name
	 *
	 * Method is called after user data is deleted from the database
	 *
	 * @param   array    $user     Holds the user data
	 * @param   boolean  $success  True if user was successfully stored in the database
	 * @param   string   $msg      Message
	 *
	 * @return  boolean
	 *
	 * @since   1.6
	 */
	public function onUserAfterDelete($user, $success, $msg)
	{
		if (!$success)
		{
			return false;
		}

		$query = $this->db->getQuery(true)
			->delete($this->db->quoteName('#__session'))
			->where($this->db->quoteName('userid') . ' = ' . (int) $user['id']);

		try
		{
			$this->db->setQuery($query)->execute();
		}
		catch (JDatabaseExceptionExecuting $e)
		{
			return false;
		}

		$query = $this->db->getQuery(true)
			->delete($this->db->quoteName('#__messages'))
			->where($this->db->quoteName('user_id_from') . ' = ' . (int) $user['id']);

		try
		{
			$this->db->setQuery($query)->execute();
		}
		catch (JDatabaseExceptionExecuting $e)
		{
			return false;
		}

		return true;
	}

	/**
	 * Utility method to act on a user after it has been saved.
	 *
	 * This method sends a registration email to new users created in the backend.
	 *
	 * @param   array    $user     Holds the new user data.
	 * @param   boolean  $isnew    True if a new user is stored.
	 * @param   boolean  $success  True if user was successfully stored in the database.
	 * @param   string   $msg      Message.
	 *
	 * @return  void
	 *
	 * @since   1.6
	 */
	public function onUserAfterSave($user, $isnew, $success, $msg)
	{
		$mail_to_user = $this->params->get('mail_to_user', 1);

		if (!$isnew || !$mail_to_user)
		{
			return;
		}

		// TODO: Suck in the frontend registration emails here as well. Job for a rainy day.
		// The method check here ensures that if running as a CLI Application we don't get any errors
		if (method_exists($this->app, 'isClient') && !$this->app->isClient('administrator'))
		{
			return;
		}

		// Check if we have a sensible from email address, if not bail out as mail would not be sent anyway
		if (strpos($this->app->get('mailfrom'), '@') === false)
		{
			$this->app->enqueueMessage(Text::_('JERROR_SENDING_EMAIL'), 'warning');

			return;
		}

		$lang = Factory::getLanguage();
		$defaultLocale = $lang->getTag();

		/**
		 * Look for user language. Priority:
		 * 	1. User frontend language
		 * 	2. User backend language
		 */
		$userParams = new Registry($user['params']);
		$userLocale = $userParams->get('language', $userParams->get('admin_language', $defaultLocale));

		if ($userLocale !== $defaultLocale)
		{
			$lang->setLanguage($userLocale);
		}

		$lang->load('plg_user_joomla', JPATH_ADMINISTRATOR);

		// Compute the mail subject.
		$emailSubject = Text::sprintf(
			'PLG_USER_JOOMLA_NEW_USER_EMAIL_SUBJECT',
			$user['name'],
			$this->app->get('sitename')
		);

		// Compute the mail body.
		$emailBody = Text::sprintf(
			'PLG_USER_JOOMLA_NEW_USER_EMAIL_BODY',
			$user['name'],
			$this->app->get('sitename'),
			Uri::root(),
			$user['username'],
			$user['password_clear']
		);

		$res = Factory::getMailer()->sendMail(
			$this->app->get('mailfrom'),
			$this->app->get('fromname'),
			$user['email'],
			$emailSubject,
			$emailBody
		);

		if ($res === false)
		{
			$this->app->enqueueMessage(Text::_('JERROR_SENDING_EMAIL'), 'warning');
		}

		// Set application language back to default if we changed it
		if ($userLocale !== $defaultLocale)
		{
			$lang->setLanguage($defaultLocale);
		}
	}

	/**
	 * This method should handle any login logic and report back to the subject
	 *
	 * @param   array  $user     Holds the user data
	 * @param   array  $options  Array holding options (remember, autoregister, group)
	 *
	 * @return  boolean  True on success
	 *
	 * @since   1.5
	 */
	public function onUserLogin($user, $options = array())
	{
		$instance = $this->_getUser($user, $options);

		// If _getUser returned an error, then pass it back.
		if ($instance instanceof Exception)
		{
			return false;
		}

		// If the user is blocked, redirect with an error
		if ($instance->block == 1)
		{
			$this->app->enqueueMessage(Text::_('JERROR_NOLOGIN_BLOCKED'), 'warning');

			return false;
		}

		// Authorise the user based on the group information
		if (!isset($options['group']))
		{
			$options['group'] = 'USERS';
		}

		// Check the user can login.
		$result = $instance->authorise($options['action']);

		if (!$result)
		{
			$this->app->enqueueMessage(Text::_('JERROR_LOGIN_DENIED'), 'warning');

			return false;
		}

		// Mark the user as logged in
		$instance->guest = 0;

		$session = Factory::getSession();

		// Grab the current session ID
		$oldSessionId = $session->getId();

		// Fork the session
		$session->fork();

		$session->set('user', $instance);

		// Ensure the new session's metadata is written to the database
		$this->app->checkSession();

		// Purge the old session
		$query = $this->db->getQuery(true)
			->delete('#__session')
			->where($this->db->quoteName('session_id') . ' = ' . $this->db->quoteBinary($oldSessionId));

		try
		{
			$this->db->setQuery($query)->execute();
		}
		catch (RuntimeException $e)
		{
			// The old session is already invalidated, don't let this block logging in
		}

		// Hit the user last visit field
		$instance->setLastVisit();

		// Add "user state" cookie used for reverse caching proxies like Varnish, Nginx etc.
		if ($this->app->isClient('site'))
		{
			$this->app->input->cookie->set(
				'joomla_user_state',
				'logged_in',
				0,
				$this->app->get('cookie_path', '/'),
				$this->app->get('cookie_domain', ''),
				$this->app->isHttpsForced(),
				true
			);
		}

		return true;
	}

	/**
	 * This method should handle any logout logic and report back to the subject
	 *
	 * @param   array  $user     Holds the user data.
	 * @param   array  $options  Array holding options (client, ...).
	 *
	 * @return  boolean  True on success
	 *
	 * @since   1.5
	 */
	public function onUserLogout($user, $options = array())
	{
		$my      = Factory::getUser();
		$session = Factory::getSession();

		// Make sure we're a valid user first
		if ($user['id'] == 0 && !$my->get('tmp_user'))
		{
			return true;
		}

		$sharedSessions = $this->app->get('shared_session', '0');

		// Check to see if we're deleting the current session
		if ($my->id == $user['id'] && ($sharedSessions || (!$sharedSessions && $options['clientid'] == $this->app->getClientId())))
		{
			// Hit the user last visit field
			$my->setLastVisit();

			// Destroy the php session for this user
			$session->destroy();
		}

		// Enable / Disable Forcing logout all users with same userid
		$forceLogout = $this->params->get('forceLogout', 1);

		if ($forceLogout)
		{
			$query = $this->db->getQuery(true)
				->delete($this->db->quoteName('#__session'))
				->where($this->db->quoteName('userid') . ' = ' . (int) $user['id']);

			if (!$sharedSessions)
			{
				$query->where($this->db->quoteName('client_id') . ' = ' . (int) $options['clientid']);
			}

			try
			{
				$this->db->setQuery($query)->execute();
			}
			catch (RuntimeException $e)
			{
				return false;
			}
		}

		// Delete "user state" cookie used for reverse caching proxies like Varnish, Nginx etc.
		if ($this->app->isClient('site'))
		{
			$this->app->input->cookie->set('joomla_user_state', '', 1, $this->app->get('cookie_path', '/'), $this->app->get('cookie_domain', ''));
		}

		return true;
	}

	/**
	 * This method will return a user object
	 *
	 * If options['autoregister'] is true, if the user doesn't exist yet they will be created
	 *
	 * @param   array  $user     Holds the user data.
	 * @param   array  $options  Array holding options (remember, autoregister, group).
	 *
	 * @return  User
	 *
	 * @since   1.5
	 */
	protected function _getUser($user, $options = array())
	{
		$instance = User::getInstance();
		$id = (int) UserHelper::getUserId($user['username']);

		if ($id)
		{
			$instance->load($id);

			return $instance;
		}

		// TODO : move this out of the plugin
		$params = ComponentHelper::getParams('com_users');

		// Read the default user group option from com_users
		$defaultUserGroup = $params->get('new_usertype', $params->get('guest_usergroup', 1));

		$instance->id = 0;
		$instance->name = $user['fullname'];
		$instance->username = $user['username'];
		$instance->password_clear = $user['password_clear'];

		// Result should contain an email (check).
		$instance->email = $user['email'];
		$instance->groups = array($defaultUserGroup);

		// If autoregister is set let's register the user
		$autoregister = isset($options['autoregister']) ? $options['autoregister'] : $this->params->get('autoregister', 1);

		if ($autoregister)
		{
			if (!$instance->save())
			{
				JLog::add('Error in autoregistration for user ' . $user['username'] . '.', JLog::WARNING, 'error');
			}
		}
		else
		{
			// No existing user and autoregister off, this is a temporary user.
			$instance->set('tmp_user', true);
		}

		return $instance;
	}
}