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<?php
/**
 * @package     Joomla.Plugin
 * @subpackage  User.joomla
 *
 * @copyright   (C) 2006 Open Source Matters, Inc. <https://www.joomla.org>
 * @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\LanguageFactoryInterface;
use Joomla\CMS\Language\Text;
use Joomla\CMS\Log\Log;
use Joomla\CMS\Mail\MailTemplate;
use Joomla\CMS\Plugin\CMSPlugin;
use Joomla\CMS\Uri\Uri;
use Joomla\CMS\User\User;
use Joomla\CMS\User\UserHelper;
use Joomla\Database\Exception\ExecutionFailureException;
use Joomla\Database\ParameterType;
use Joomla\Registry\Registry;

/**
 * Joomla User plugin
 *
 * @since  1.5
 */
class PlgUserJoomla extends CMSPlugin
{
	/**
	 * Application object
	 *
	 * @var    \Joomla\CMS\Application\CMSApplicationInterface
	 * @since  3.2
	 */
	protected $app;

/**
	 * Database object
	 *
	 * @var    \Joomla\Database\DatabaseInterface
	 * @since  3.2
	 */
	protected $db;

/**
	 * Set as required the passwords fields when mail to user is set to No
	 *
	 * @param   JForm  $form  The form to be altered.
	 * @param   mixed  $data  The associated data for the form.
	 *
	 * @return  boolean
	 *
	 * @since   4.0.0
	 */
	public function onContentPrepareForm($form, $data)
	{
		// Check we are manipulating a valid user form before modifying it.
		$name = $form->getName();

if ($name === 'com_users.user')
		{
			// In case there is a validation error (like duplicated user), $data is an empty array on save.
			// After returning from error, $data is an array but populated
			if (!$data)
			{
				$data = Factory::getApplication()->input->get('jform', array(), 'array');
			}

if (is_array($data))
			{
				$data = (object) $data;
			}

// Passwords fields are required when mail to user is set to No
			if (empty($data->id) && !$this->params->get('mail_to_user', 1))
			{
				$form->setFieldAttribute('password', 'required', 'true');
				$form->setFieldAttribute('password2', 'required', 'true');
			}
		}

return true;
	}

/**
	 * 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   $msg      Message
	 *
	 * @return  void
	 *
	 * @since   1.6
	 */
	public function onUserAfterDelete($user, $success, $msg): void
	{
		if (!$success)
		{
			return;
		}

$userId = (int) $user['id'];

// Only execute this if the session metadata is tracked
		if ($this->app->get('session_metadata', true))
		{
			UserHelper::destroyUserSessions($userId, true);
		}

try
		{
			$this->db->setQuery(
				$this->db->getQuery(true)
					->delete($this->db->quoteName('#__messages'))
					->where($this->db->quoteName('user_id_from') . ' = :userId')
					->bind(':userId', $userId, ParameterType::INTEGER)
			)->execute();
		}
		catch (ExecutionFailureException $e)
		{
			// Do nothing.
		}
	}

/**
	 * 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): void
	{
		$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;
		}

$defaultLanguage = Factory::getLanguage();
		$defaultLocale   = $defaultLanguage->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));

// Temporarily set application language to user's language.
		if ($userLocale !== $defaultLocale)
		{
			Factory::$language = Factory::getContainer()
				->get(LanguageFactoryInterface::class)
				->createLanguage($userLocale, $this->app->get('debug_lang', false));
		}

// Load plugin language files.
		$this->loadLanguage();

// Collect data for mail
		$data = [
			'name' => $user['name'],
			'sitename' => $this->app->get('sitename'),
			'url' => Uri::root(),
			'username' => $user['username'],
			'password' => $user['password_clear'],
			'email' => $user['email'],
		];

$mailer = new MailTemplate('plg_user_joomla.mail', $userLocale);
		$mailer->addTemplateData($data);
		$mailer->addRecipient($user['email'], $user['name']);

try
		{
			$res = $mailer->send();
		}
		catch (\Exception $exception)
		{
			try
			{
				Log::add(Text::_($exception->getMessage()), Log::WARNING, 'jerror');

$res = false;
			}
			catch (\RuntimeException $exception)
			{
				$this->app->enqueueMessage(Text::_($exception->errorMessage()), 'warning');

$res = false;
			}
		}

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

// Set application language back to default if we changed it
		if ($userLocale !== $defaultLocale)
		{
			Factory::$language = $defaultLanguage;
		}
	}

/**
	 * 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 = [])
	{
		$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;

// Load the logged in user to the application
		$this->app->loadIdentity($instance);

$session = $this->app->getSession();

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

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

// Register the needed session variables
		$session->set('user', $instance);

// Update the user related fields for the Joomla sessions table if tracking session metadata.
		if ($this->app->get('session_metadata', true))
		{
			$this->app->checkSession();
		}

// Purge the old session
		$query = $this->db->getQuery(true)
			->delete($this->db->quoteName('#__session'))
			->where($this->db->quoteName('session_id') . ' = :sessionid')
			->bind(':sessionid', $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 = [])
	{
		$my      = Factory::getUser();
		$session = Factory::getSession();

$userid = (int) $user['id'];

// 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 == $userid && ($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, but only if session metadata is tracked
		$forceLogout = $this->params->get('forceLogout', 1) && $this->app->get('session_metadata', true);

if ($forceLogout)
		{
			$clientId = $sharedSessions ? null : (int) $options['clientid'];
			UserHelper::destroyUserSessions($user['id'], false, $clientId);
		}

// 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 = [])
	{
		$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'];
		$instance->groups = [$defaultUserGroup];

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

if ($autoregister)
		{
			if (!$instance->save())
			{
				Log::add('Failed to automatically create account for user ' . $user['username'] . '.', Log::WARNING, 'error');
			}
		}
		else
		{
			// No existing user and autoregister off, this is a temporary user.
			$instance->set('tmp_user', true);
		}

return $instance;
	}
}