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Filename : Session.php
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<?php

/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2005 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Session;

use Joomla\CMS\Application\ApplicationHelper;
use Joomla\CMS\Factory;
use Joomla\CMS\Language\Text;
use Joomla\CMS\Router\Route;
use Joomla\Event\DispatcherInterface;
use Joomla\Session\Session as BaseSession;
use Joomla\Session\StorageInterface;

/**
 * Class for managing HTTP sessions
 *
 * @since  1.5
 */
class Session extends BaseSession
{
    /**
     * Constructor
     *
     * @param   StorageInterface     $store       A StorageInterface implementation.
     * @param   DispatcherInterface  $dispatcher  DispatcherInterface for the session to use.
     * @param   array                $options     Optional parameters. Supported keys include:
     *                                            - name: The session name
     *                                            - id: The session ID
     *                                            - expire: The session lifetime in seconds
     *
     * @since   1.0
     */
    public function __construct(StorageInterface $store = null, DispatcherInterface $dispatcher = null, array $options = [])
    {
        // Extra hash the name of the session for b/c with Joomla 3.x or the session is never found.
        if (isset($options['name'])) {
            $options['name'] = md5($options['name']);
        }

        parent::__construct($store, $dispatcher, $options);
    }

    /**
     * Checks for a form token in the request.
     *
     * Use in conjunction with HTMLHelper::_('form.token') or JSession::getFormToken.
     *
     * @param   string  $method  The request method in which to look for the token key.
     *
     * @return  boolean  True if found and valid, false otherwise.
     *
     * @since   2.5.4
     */
    public static function checkToken($method = 'post')
    {
        $app   = Factory::getApplication();
        $token = static::getFormToken();

        // Check from header first
        if ($token === $app->input->server->get('HTTP_X_CSRF_TOKEN', '', 'alnum')) {
            return true;
        }

        // Then fallback to HTTP query
        if (!$app->input->$method->get($token, '', 'alnum')) {
            if ($app->getSession()->isNew()) {
                // Redirect to login screen.
                $app->enqueueMessage(Text::_('JLIB_ENVIRONMENT_SESSION_EXPIRED'), 'warning');
                $app->redirect(Route::_('index.php'));

                return true;
            }

            return false;
        }

        return true;
    }

    /**
     * Method to determine a hash for anti-spoofing variable names
     *
     * @param   boolean  $forceNew  If true, force a new token to be created
     *
     * @return  string  Hashed var name
     *
     * @since   1.6
     */
    public static function getFormToken($forceNew = false)
    {
        $user = Factory::getUser();

        return ApplicationHelper::getHash($user->get('id', 0) . Factory::getApplication()->getSession()->getToken($forceNew));
    }

    /**
     * Get the available session handlers
     *
     * @return  array  An array of available session handlers
     *
     * @since   4.0.0
     */
    public static function getHandlers(): array
    {
        $connectors = [];

        // Get an iterator and loop through the handler classes.
        $iterator = new \DirectoryIterator(JPATH_LIBRARIES . '/vendor/joomla/session/src/Handler');

        foreach ($iterator as $file) {
            $fileName = $file->getFilename();

            // Only load for PHP files.
            if (!$file->isFile() || $file->getExtension() !== 'php') {
                continue;
            }

            // Derive the class name from the type.
            $class = str_ireplace('.php', '', '\\Joomla\\Session\\Handler\\' . $fileName);

            // If the class doesn't exist we have nothing left to do but look at the next type. We did our best.
            if (!class_exists($class)) {
                continue;
            }

            // Sweet!  Our class exists, so now we just need to know if it passes its test method.
            if ($class::isSupported()) {
                // Connector names should not have file the handler suffix or the file extension.
                $connectors[] = str_ireplace('Handler.php', '', $fileName);
            }
        }

        return $connectors;
    }

    /**
     * Returns the global session object.
     *
     * @return  static  The Session object.
     *
     * @since   1.5
     * @deprecated  5.0  Load the session service from the dependency injection container or via $app->getSession()
     */
    public static function getInstance()
    {
        @trigger_error(
            __METHOD__ . '() is deprecated. Load the session from the dependency injection container or via Factory::getApplication()->getSession().',
            E_USER_DEPRECATED
        );

        return Factory::getApplication()->getSession();
    }

    /**
     * Get data from the session store
     *
     * @param   string  $name     Name of a variable
     * @param   mixed   $default  Default value of a variable if not set
     *
     * @return  mixed  Value of a variable
     *
     * @since   1.5
     */
    public function get($name, $default = null)
    {
        // Handle B/C by checking if a namespace was passed to the method, will be removed at 5.0
        if (\func_num_args() > 2) {
            $args = \func_get_args();

            if (!empty($args[2])) {
                @trigger_error(
                    'Passing a namespace as a parameter to ' . __METHOD__ . '() is deprecated. '
                    . 'The namespace should be prepended to the name instead.',
                    E_USER_DEPRECATED
                );

                $name = $args[2] . '.' . $name;
            }
        }

        if (parent::has($name)) {
            // Parent is used because of b/c, can be changed in Joomla 5
            return parent::get($name, $default);
        }

        /*
         * B/C for retrieving sessions that originated in Joomla 3.
         * A namespace before Joomla 4 has a prefix of 2 underscores (__).
         * This is no longer the case in Joomla 4 and will be converted
         * when saving new values in `self::set()`
         */
        if (strpos($name, '.') !== false && parent::has('__' . $name)) {
            return parent::get('__' . $name, $default);
        }

        // More b/c for retrieving sessions that originated in Joomla 3. This will be removed in Joomla 5
        // as no sessions should have this format anymore!
        if (parent::has('__default.' . $name)) {
            return parent::get('__default.' . $name, $default);
        }

        return $default;
    }

    /**
     * Set data into the session store.
     *
     * @param   string  $name   Name of a variable.
     * @param   mixed   $value  Value of a variable.
     *
     * @return  mixed  Old value of a variable.
     *
     * @since   1.5
     */
    public function set($name, $value = null)
    {
        // Handle B/C by checking if a namespace was passed to the method, will be removed at 5.0
        if (\func_num_args() > 2) {
            $args = \func_get_args();

            if (!empty($args[2])) {
                @trigger_error(
                    'Passing a namespace as a parameter to ' . __METHOD__ . '() is deprecated. '
                    . 'The namespace should be prepended to the name instead.',
                    E_USER_DEPRECATED
                );

                $name = $args[2] . '.' . $name;
            }
        }

        return parent::set($name, $value);
    }

    /**
     * Check whether data exists in the session store
     *
     * @param   string  $name  Name of variable
     *
     * @return  boolean  True if the variable exists
     *
     * @since   1.5
     */
    public function has($name)
    {
        // Handle B/C by checking if a namespace was passed to the method, will be removed at 5.0
        if (\func_num_args() > 1) {
            $args = \func_get_args();

            if (!empty($args[1])) {
                @trigger_error(
                    'Passing a namespace as a parameter to ' . __METHOD__ . '() is deprecated. '
                    . 'The namespace should be prepended to the name instead.',
                    E_USER_DEPRECATED
                );

                $name = $args[1] . '.' . $name;
            }
        }

        if (parent::has($name)) {
            return true;
        }

        /*
         * B/C for retrieving sessions that originated in Joomla 3.
         * A namespace before Joomla 4 has a prefix of 2 underscores (__).
         * This is no longer the case in Joomla 4 and will be converted
         * when saving new values in `self::set()`
         */
        if (strpos($name, '.') !== false && parent::has('__' . $name)) {
            return true;
        }

        // More b/c for retrieving sessions that originated in Joomla 3. This will be removed in Joomla 5
        // as no sessions should have this format anymore!
        return parent::has('__default.' . $name);
    }

    /**
     * Clears all variables from the session store
     *
     * @return  void
     *
     * @since   1.5
     */
    public function clear()
    {
        // Handle B/C by checking if parameters were passed to this method; if so proxy to the new remove() method, will be removed at 5.0
        if (\func_num_args() >= 1) {
            $args = \func_get_args();

            if (!empty($args[0])) {
                @trigger_error(
                    'Using ' . __METHOD__ . '() to remove a single element from the session is deprecated.  Use ' . __CLASS__ . '::remove() instead.',
                    E_USER_DEPRECATED
                );

                $name = $args[0];

                // Also check for a namespace
                if (\func_num_args() > 1 && !empty($args[1])) {
                    @trigger_error(
                        'Passing a namespace as a parameter to ' . __METHOD__ . '() is deprecated. '
                         . 'The namespace should be prepended to the name instead.',
                        E_USER_DEPRECATED
                    );

                    $name = $args[1] . '.' . $name;
                }

                $this->remove($name);

                /*
                 * B/C for cleaning sessions that originated in Joomla 3.
                 * A namespace before Joomla 4 has a prefix of 2 underscores (__).
                 * This is no longer the case in Joomla 4 so we clean both variants.
                 */
                $this->remove('__' . $name);

                return;
            }
        }

        parent::clear();
    }
}