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<?php

/**
 * This file is part of the CodeIgniter 4 framework.
 *
 * (c) CodeIgniter Foundation <admin@codeigniter.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace CodeIgniter\Session;

use CodeIgniter\Session\Exceptions\SessionException;
use Config\App;
use Psr\Log\LoggerAwareTrait;
use Psr\Log\LoggerInterface;
use SessionHandlerInterface;

/**
 * Implementation of CodeIgniter session container.
 *
 * Session configuration is done through session variables and cookie related
 * variables in app/config/App.php
 */
class Session implements SessionInterface
{
	use LoggerAwareTrait;

	/**
	 * Instance of the driver to use.
	 *
	 * @var SessionHandlerInterface
	 */
	protected $driver;

	/**
	 * The storage driver to use: files, database, redis, memcached
	 *
	 * @var string
	 */
	protected $sessionDriverName;

	/**
	 * The session cookie name, must contain only [0-9a-z_-] characters.
	 *
	 * @var string
	 */
	protected $sessionCookieName = 'ci_session';

	/**
	 * The number of SECONDS you want the session to last.
	 * Setting it to 0 (zero) means expire when the browser is closed.
	 *
	 * @var integer
	 */
	protected $sessionExpiration = 7200;

	/**
	 * The location to save sessions to, driver dependent..
	 *
	 * For the 'files' driver, it's a path to a writable directory.
	 * WARNING: Only absolute paths are supported!
	 *
	 * For the 'database' driver, it's a table name.
	 *
	 * TODO: address memcache & redis needs
	 *
	 * IMPORTANT: You are REQUIRED to set a valid save path!
	 *
	 * @var string
	 */
	protected $sessionSavePath;

	/**
	 * Whether to match the user's IP address when reading the session data.
	 *
	 * WARNING: If you're using the database driver, don't forget to update
	 * your session table's PRIMARY KEY when changing this setting.
	 *
	 * @var boolean
	 */
	protected $sessionMatchIP = false;

	/**
	 * How many seconds between CI regenerating the session ID.
	 *
	 * @var integer
	 */
	protected $sessionTimeToUpdate = 300;

	/**
	 * Whether to destroy session data associated with the old session ID
	 * when auto-regenerating the session ID. When set to FALSE, the data
	 * will be later deleted by the garbage collector.
	 *
	 * @var boolean
	 */
	protected $sessionRegenerateDestroy = false;

	/**
	 * The domain name to use for cookies.
	 * Set to .your-domain.com for site-wide cookies.
	 *
	 * @var string
	 */
	protected $cookieDomain = '';

	/**
	 * Path used for storing cookies.
	 * Typically will be a forward slash.
	 *
	 * @var string
	 */
	protected $cookiePath = '/';

	/**
	 * Cookie will only be set if a secure HTTPS connection exists.
	 *
	 * @var boolean
	 */
	protected $cookieSecure = false;

	/**
	 * Cookie SameSite setting as described in RFC6265
	 * Must be 'None', 'Lax' or 'Strict'.
	 *
	 * @var string 'Lax'|'None'|'Strict'
	 */
	protected $cookieSameSite = 'Lax';

	/**
	 * sid regex expression
	 *
	 * @var string
	 */
	protected $sidRegexp;

	/**
	 * Logger instance to record error messages and warnings.
	 *
	 * @var LoggerInterface
	 */
	protected $logger;

	//--------------------------------------------------------------------

	/**
	 * Constructor.
	 *
	 * Extract configuration settings and save them here.
	 *
	 * @param SessionHandlerInterface $driver
	 * @param App                     $config
	 */
	public function __construct(SessionHandlerInterface $driver, $config)
	{
		$this->driver = $driver;

		$this->sessionDriverName        = $config->sessionDriver;
		$this->sessionCookieName        = $config->sessionCookieName ?? $this->sessionCookieName;
		$this->sessionExpiration        = $config->sessionExpiration ?? $this->sessionExpiration;
		$this->sessionSavePath          = $config->sessionSavePath;
		$this->sessionMatchIP           = $config->sessionMatchIP ?? $this->sessionMatchIP;
		$this->sessionTimeToUpdate      = $config->sessionTimeToUpdate ?? $this->sessionTimeToUpdate;
		$this->sessionRegenerateDestroy = $config->sessionRegenerateDestroy ?? $this->sessionRegenerateDestroy;

		$this->cookieDomain   = $config->cookieDomain ?? $this->cookieDomain;
		$this->cookiePath     = $config->cookiePath ?? $this->cookiePath;
		$this->cookieSecure   = $config->cookieSecure ?? $this->cookieSecure;
		$this->cookieSameSite = $config->cookieSameSite ?? $this->cookieSameSite;

		if (! in_array(strtolower($this->cookieSameSite), ['', 'none', 'lax', 'strict'], true))
		{
			throw SessionException::forInvalidSameSiteSetting($this->cookieSameSite);
		}

		helper('array');
	}

	//--------------------------------------------------------------------

	/**
	 * Initialize the session container and starts up the session.
	 *
	 * @return mixed
	 */
	public function start()
	{
		if (is_cli() && ENVIRONMENT !== 'testing')
		{
			// @codeCoverageIgnoreStart
			$this->logger->debug('Session: Initialization under CLI aborted.');

			return;
			// @codeCoverageIgnoreEnd
		}

		if ((bool) ini_get('session.auto_start'))
		{
			$this->logger->error('Session: session.auto_start is enabled in php.ini. Aborting.');

			return;
		}

		if (session_status() === PHP_SESSION_ACTIVE)
		{
			$this->logger->warning('Session: Sessions is enabled, and one exists.Please don\'t $session->start();');

			return;
		}

		$this->configure();

		$this->setSaveHandler();

		// Sanitize the cookie, because apparently PHP doesn't do that for userspace handlers
		if (isset($_COOKIE[$this->sessionCookieName]) && (
				! is_string($_COOKIE[$this->sessionCookieName]) || ! preg_match('#\A' . $this->sidRegexp . '\z#', $_COOKIE[$this->sessionCookieName])
				)
		)
		{
			unset($_COOKIE[$this->sessionCookieName]);
		}

		$this->startSession();

		// Is session ID auto-regeneration configured? (ignoring ajax requests)
		if ((empty($_SERVER['HTTP_X_REQUESTED_WITH'])
			|| strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) !== 'xmlhttprequest')
			&& ($regenerateTime = $this->sessionTimeToUpdate) > 0
		)
		{
			if (! isset($_SESSION['__ci_last_regenerate']))
			{
				$_SESSION['__ci_last_regenerate'] = time();
			}
			elseif ($_SESSION['__ci_last_regenerate'] < (time() - $regenerateTime))
			{
				$this->regenerate((bool) $this->sessionRegenerateDestroy);
			}
		}
		// Another work-around ... PHP doesn't seem to send the session cookie
		// unless it is being currently created or regenerated
		elseif (isset($_COOKIE[$this->sessionCookieName]) && $_COOKIE[$this->sessionCookieName] === session_id())
		{
			$this->setCookie();
		}

		$this->initVars();

		$this->logger->info("Session: Class initialized using '" . $this->sessionDriverName . "' driver.");

		return $this;
	}

	//--------------------------------------------------------------------

	/**
	 * Does a full stop of the session:
	 *
	 * - destroys the session
	 * - unsets the session id
	 * - destroys the session cookie
	 */
	public function stop()
	{
		setcookie(
				$this->sessionCookieName, session_id(), 1, $this->cookiePath, $this->cookieDomain, $this->cookieSecure, true
		);

		session_regenerate_id(true);
	}

	//--------------------------------------------------------------------

	/**
	 * Configuration.
	 *
	 * Handle input binds and configuration defaults.
	 */
	protected function configure()
	{
		if (empty($this->sessionCookieName))
		{
			$this->sessionCookieName = ini_get('session.name');
		}
		else
		{
			ini_set('session.name', $this->sessionCookieName);
		}

		if (PHP_VERSION_ID < 70300)
		{
			$sameSite = '';
			if ($this->cookieSameSite !== '')
			{
				$sameSite = '; samesite=' . $this->cookieSameSite;
			}

			session_set_cookie_params(
				$this->sessionExpiration,
				$this->cookiePath . $sameSite, // Hacky way to set SameSite for PHP 7.2 and earlier
				$this->cookieDomain,
				$this->cookieSecure,
				true // HTTP only; Yes, this is intentional and not configurable for security reasons.
			);
		}
		else
		{
			// PHP 7.3 adds support for setting samesite in session_set_cookie_params()
			$params = [
				'lifetime' => $this->sessionExpiration,
				'path'     => $this->cookiePath,
				'domain'   => $this->cookieDomain,
				'secure'   => $this->cookieSecure,
				'httponly' => true, // HTTP only; Yes, this is intentional and not configurable for security reasons.
			];

			if ($this->cookieSameSite !== '')
			{
				$params['samesite'] = $this->cookieSameSite;
				ini_set('session.cookie_samesite', $this->cookieSameSite);
			}

			session_set_cookie_params($params);
		}

		//if (empty($this->sessionExpiration))
		if (! isset($this->sessionExpiration))
		{
			$this->sessionExpiration = (int) ini_get('session.gc_maxlifetime');
		}
		else
		{
			ini_set('session.gc_maxlifetime', (string) $this->sessionExpiration);
		}

		if (! empty($this->sessionSavePath))
		{
			ini_set('session.save_path', $this->sessionSavePath);
		}

		// Security is king
		ini_set('session.use_trans_sid', '0');
		ini_set('session.use_strict_mode', '1');
		ini_set('session.use_cookies', '1');
		ini_set('session.use_only_cookies', '1');

		$this->configureSidLength();
	}

	// ------------------------------------------------------------------------

	/**
	 * Configure session ID length
	 *
	 * To make life easier, we used to force SHA-1 and 4 bits per
	 * character on everyone. And of course, someone was unhappy.
	 *
	 * Then PHP 7.1 broke backwards-compatibility because ext/session
	 * is such a mess that nobody wants to touch it with a pole stick,
	 * and the one guy who does, nobody has the energy to argue with.
	 *
	 * So we were forced to make changes, and OF COURSE something was
	 * going to break and now we have this pile of shit. -- Narf
	 *
	 * @return void
	 */
	protected function configureSidLength()
	{
		$bitsPerCharacter = (int) (ini_get('session.sid_bits_per_character') !== false
			? ini_get('session.sid_bits_per_character')
			: 4);

		$sidLength = (int) (ini_get('session.sid_length') !== false
			? ini_get('session.sid_length')
			: 40);

		if (($sidLength * $bitsPerCharacter) < 160)
		{
			$bits = ($sidLength * $bitsPerCharacter);
			// Add as many more characters as necessary to reach at least 160 bits
			$sidLength += (int) ceil((160 % $bits) / $bitsPerCharacter);
			ini_set('session.sid_length', (string) $sidLength);
		}

		// Yes, 4,5,6 are the only known possible values as of 2016-10-27
		switch ($bitsPerCharacter)
		{
			case 4:
				$this->sidRegexp = '[0-9a-f]';
				break;
			case 5:
				$this->sidRegexp = '[0-9a-v]';
				break;
			case 6:
				$this->sidRegexp = '[0-9a-zA-Z,-]';
				break;
		}

		$this->sidRegexp .= '{' . $sidLength . '}';
	}

	//--------------------------------------------------------------------

	/**
	 * Handle temporary variables
	 *
	 * Clears old "flash" data, marks the new one for deletion and handles
	 * "temp" data deletion.
	 */
	protected function initVars()
	{
		if (empty($_SESSION['__ci_vars']))
		{
			return;
		}

		$currentTime = time();

		foreach ($_SESSION['__ci_vars'] as $key => &$value)
		{
			if ($value === 'new')
			{
				$_SESSION['__ci_vars'][$key] = 'old';
			}
			// DO NOT move this above the 'new' check!
			elseif ($value === 'old' || $value < $currentTime)
			{
				unset($_SESSION[$key], $_SESSION['__ci_vars'][$key]);
			}
		}

		if (empty($_SESSION['__ci_vars']))
		{
			unset($_SESSION['__ci_vars']);
		}
	}

	//--------------------------------------------------------------------
	//--------------------------------------------------------------------
	// Session Utility Methods
	//--------------------------------------------------------------------

	/**
	 * Regenerates the session ID.
	 *
	 * @param boolean $destroy Should old session data be destroyed?
	 */
	public function regenerate(bool $destroy = false)
	{
		$_SESSION['__ci_last_regenerate'] = time();
		session_regenerate_id($destroy);
	}

	//--------------------------------------------------------------------

	/**
	 * Destroys the current session.
	 */
	public function destroy()
	{
		session_destroy();
	}

	//--------------------------------------------------------------------
	//--------------------------------------------------------------------
	// Basic Setters and Getters
	//--------------------------------------------------------------------

	/**
	 * Sets user data into the session.
	 *
	 * If $data is a string, then it is interpreted as a session property
	 * key, and  $value is expected to be non-null.
	 *
	 * If $data is an array, it is expected to be an array of key/value pairs
	 * to be set as session properties.
	 *
	 * @param string|array $data  Property name or associative array of properties
	 * @param mixed        $value Property value if single key provided
	 */
	public function set($data, $value = null)
	{
		if (is_array($data))
		{
			foreach ($data as $key => &$value)
			{
				if (is_int($key))
				{
					$_SESSION[$value] = null;
				}
				else
				{
					$_SESSION[$key] = $value;
				}
			}

			return;
		}

		$_SESSION[$data] = $value;
	}

	//--------------------------------------------------------------------

	/**
	 * Get user data that has been set in the session.
	 *
	 * If the property exists as "normal", returns it.
	 * Otherwise, returns an array of any temp or flash data values with the
	 * property key.
	 *
	 * Replaces the legacy method $session->userdata();
	 *
	 * @param  string|null $key Identifier of the session property to retrieve
	 * @return mixed	The property value(s)
	 */
	public function get(string $key = null)
	{
		if (! empty($key) && (! is_null($value = isset($_SESSION[$key]) ? $_SESSION[$key] : null) || ! is_null($value = dot_array_search($key, $_SESSION ?? []))))
		{
			return $value;
		}

		if (empty($_SESSION))
		{
			return $key === null ? [] : null;
		}

		if (! empty($key))
		{
			return null;
		}

		$userdata = [];
		$_exclude = array_merge(
			['__ci_vars'], $this->getFlashKeys(), $this->getTempKeys()
		);

		$keys = array_keys($_SESSION);
		foreach ($keys as $key)
		{
			if (! in_array($key, $_exclude, true))
			{
				$userdata[$key] = $_SESSION[$key];
			}
		}

		return $userdata;
	}

	//--------------------------------------------------------------------

	/**
	 * Returns whether an index exists in the session array.
	 *
	 * @param string $key Identifier of the session property we are interested in.
	 *
	 * @return boolean
	 */
	public function has(string $key): bool
	{
		return isset($_SESSION[$key]);
	}

	   //--------------------------------------------------------------------

	/**
	 * Push new value onto session value that is array.
	 *
	 * @param string $key  Identifier of the session property we are interested in.
	 * @param array  $data value to be pushed to existing session key.
	 *
	 * @return void
	 */
	public function push(string $key, array $data)
	{
		if ($this->has($key) && is_array($value = $this->get($key)))
		{
			$this->set($key, array_merge($value, $data));
		}
	}

	//--------------------------------------------------------------------

	/**
	 * Remove one or more session properties.
	 *
	 * If $key is an array, it is interpreted as an array of string property
	 * identifiers to remove. Otherwise, it is interpreted as the identifier
	 * of a specific session property to remove.
	 *
	 * @param string|array $key Identifier of the session property or properties to remove.
	 */
	public function remove($key)
	{
		if (is_array($key))
		{
			foreach ($key as $k)
			{
				unset($_SESSION[$k]);
			}

			return;
		}

		unset($_SESSION[$key]);
	}

	//--------------------------------------------------------------------

	/**
	 * Magic method to set variables in the session by simply calling
	 *  $session->foo = bar;
	 *
	 * @param string       $key   Identifier of the session property to set.
	 * @param string|array $value
	 */
	public function __set(string $key, $value)
	{
		$_SESSION[$key] = $value;
	}

	//--------------------------------------------------------------------

	/**
	 * Magic method to get session variables by simply calling
	 *  $foo = $session->foo;
	 *
	 * @param string $key Identifier of the session property to remove.
	 *
	 * @return null|string
	 */
	public function __get(string $key)
	{
		// Note: Keep this order the same, just in case somebody wants to
		//       use 'session_id' as a session data key, for whatever reason
		if (isset($_SESSION[$key]))
		{
			return $_SESSION[$key];
		}

		if ($key === 'session_id')
		{
			return session_id();
		}

		return null;
	}

	//--------------------------------------------------------------------

	/**
	 * Magic method to check for session variables.
	 * Different from has() in that it will validate 'session_id' as well.
	 * Mostly used by internal PHP functions, users should stick to has()
	 *
	 * @param string $key Identifier of the session property to remove.
	 *
	 * @return boolean
	 */
	public function __isset(string $key): bool
	{
		return isset($_SESSION[$key]) || ($key === 'session_id');
	}

	//--------------------------------------------------------------------
	//--------------------------------------------------------------------
	// Flash Data Methods
	//--------------------------------------------------------------------

	/**
	 * Sets data into the session that will only last for a single request.
	 * Perfect for use with single-use status update messages.
	 *
	 * If $data is an array, it is interpreted as an associative array of
	 * key/value pairs for flashdata properties.
	 * Otherwise, it is interpreted as the identifier of a specific
	 * flashdata property, with $value containing the property value.
	 *
	 * @param array|string $data  Property identifier or associative array of properties
	 * @param string|array $value Property value if $data is a scalar
	 */
	public function setFlashdata($data, $value = null)
	{
		$this->set($data, $value);
		$this->markAsFlashdata(is_array($data) ? array_keys($data) : $data);
	}

	//--------------------------------------------------------------------

	/**
	 * Retrieve one or more items of flash data from the session.
	 *
	 * If the item key is null, return all flashdata.
	 *
	 * @param  string $key Property identifier
	 * @return array|null	The requested property value, or an associative array of them
	 */
	public function getFlashdata(string $key = null)
	{
		if (isset($key))
		{
			return (isset($_SESSION['__ci_vars'], $_SESSION['__ci_vars'][$key], $_SESSION[$key]) &&
					! is_int($_SESSION['__ci_vars'][$key])) ? $_SESSION[$key] : null;
		}

		$flashdata = [];

		if (! empty($_SESSION['__ci_vars']))
		{
			foreach ($_SESSION['__ci_vars'] as $key => &$value)
			{
				is_int($value) || $flashdata[$key] = $_SESSION[$key];
			}
		}

		return $flashdata;
	}

	//--------------------------------------------------------------------

	/**
	 * Keeps a single piece of flash data alive for one more request.
	 *
	 * @param array|string $key Property identifier or array of them
	 */
	public function keepFlashdata($key)
	{
		$this->markAsFlashdata($key);
	}

	//--------------------------------------------------------------------

	/**
	 * Mark a session property or properties as flashdata.
	 *
	 * @param array|string $key Property identifier or array of them
	 *
	 * @return boolean False if any of the properties are not already set
	 */
	public function markAsFlashdata($key): bool
	{
		if (is_array($key))
		{
			foreach ($key as $sessionKey)
			{
				if (! isset($_SESSION[$sessionKey]))
				{
					return false;
				}
			}

			$new = array_fill_keys($key, 'new');

			$_SESSION['__ci_vars'] = isset($_SESSION['__ci_vars']) ? array_merge($_SESSION['__ci_vars'], $new) : $new;

			return true;
		}

		if (! isset($_SESSION[$key]))
		{
			return false;
		}

		$_SESSION['__ci_vars'][$key] = 'new';

		return true;
	}

	//--------------------------------------------------------------------

	/**
	 * Unmark data in the session as flashdata.
	 *
	 * @param mixed $key Property identifier or array of them
	 */
	public function unmarkFlashdata($key)
	{
		if (empty($_SESSION['__ci_vars']))
		{
			return;
		}

		is_array($key) || $key = [$key]; // @phpstan-ignore-line

		foreach ($key as $k)
		{
			if (isset($_SESSION['__ci_vars'][$k]) && ! is_int($_SESSION['__ci_vars'][$k]))
			{
				unset($_SESSION['__ci_vars'][$k]);
			}
		}

		if (empty($_SESSION['__ci_vars']))
		{
			unset($_SESSION['__ci_vars']);
		}
	}

	//--------------------------------------------------------------------

	/**
	 * Retrieve all of the keys for session data marked as flashdata.
	 *
	 * @return array	The property names of all flashdata
	 */
	public function getFlashKeys(): array
	{
		if (! isset($_SESSION['__ci_vars']))
		{
			return [];
		}

		$keys = [];
		foreach (array_keys($_SESSION['__ci_vars']) as $key)
		{
			is_int($_SESSION['__ci_vars'][$key]) || $keys[] = $key;
		}

		return $keys;
	}

	//--------------------------------------------------------------------
	//--------------------------------------------------------------------
	// Temp Data Methods
	//--------------------------------------------------------------------

	/**
	 * Sets new data into the session, and marks it as temporary data
	 * with a set lifespan.
	 *
	 * @param string|array $data  Session data key or associative array of items
	 * @param null         $value Value to store
	 * @param integer      $ttl   Time-to-live in seconds
	 */
	public function setTempdata($data, $value = null, int $ttl = 300)
	{
		$this->set($data, $value);
		$this->markAsTempdata($data, $ttl);
	}

	//--------------------------------------------------------------------

	/**
	 * Returns either a single piece of tempdata, or all temp data currently
	 * in the session.
	 *
	 * @param  string $key Session data key
	 * @return mixed  Session data value or null if not found.
	 */
	public function getTempdata(string $key = null)
	{
		if (isset($key))
		{
			return (isset($_SESSION['__ci_vars'], $_SESSION['__ci_vars'][$key], $_SESSION[$key]) &&
					is_int($_SESSION['__ci_vars'][$key])) ? $_SESSION[$key] : null;
		}

		$tempdata = [];

		if (! empty($_SESSION['__ci_vars']))
		{
			foreach ($_SESSION['__ci_vars'] as $key => &$value)
			{
				is_int($value) && $tempdata[$key] = $_SESSION[$key];
			}
		}

		return $tempdata;
	}

	//--------------------------------------------------------------------

	/**
	 * Removes a single piece of temporary data from the session.
	 *
	 * @param string $key Session data key
	 */
	public function removeTempdata(string $key)
	{
		$this->unmarkTempdata($key);
		unset($_SESSION[$key]);
	}

	//--------------------------------------------------------------------

	/**
	 * Mark one of more pieces of data as being temporary, meaning that
	 * it has a set lifespan within the session.
	 *
	 * @param string|array $key Property identifier or array of them
	 * @param integer      $ttl Time to live, in seconds
	 *
	 * @return boolean    False if any of the properties were not set
	 */
	public function markAsTempdata($key, int $ttl = 300): bool
	{
		$ttl += time();

		if (is_array($key))
		{
			$temp = [];

			foreach ($key as $k => $v)
			{
				// Do we have a key => ttl pair, or just a key?
				if (is_int($k))
				{
					$k = $v;
					$v = $ttl;
				}
				elseif (is_string($v))
				{
					$v = time() + $ttl;
				}
				else
				{
					$v += time();
				}

				if (! array_key_exists($k, $_SESSION))
				{
					return false;
				}

				$temp[$k] = $v;
			}

			$_SESSION['__ci_vars'] = isset($_SESSION['__ci_vars']) ? array_merge($_SESSION['__ci_vars'], $temp) : $temp;

			return true;
		}

		if (! isset($_SESSION[$key]))
		{
			return false;
		}

		$_SESSION['__ci_vars'][$key] = $ttl;

		return true;
	}

	//--------------------------------------------------------------------

	/**
	 * Unmarks temporary data in the session, effectively removing its
	 * lifespan and allowing it to live as long as the session does.
	 *
	 * @param string|array $key	Property identifier or array of them
	 */
	public function unmarkTempdata($key)
	{
		if (empty($_SESSION['__ci_vars']))
		{
			return;
		}

		is_array($key) || $key = [$key]; // @phpstan-ignore-line

		foreach ($key as $k)
		{
			if (isset($_SESSION['__ci_vars'][$k]) && is_int($_SESSION['__ci_vars'][$k]))
			{
				unset($_SESSION['__ci_vars'][$k]);
			}
		}

		if (empty($_SESSION['__ci_vars']))
		{
			unset($_SESSION['__ci_vars']);
		}
	}

	//--------------------------------------------------------------------

	/**
	 * Retrieve the keys of all session data that have been marked as temporary data.
	 *
	 * @return array
	 */
	public function getTempKeys(): array
	{
		if (! isset($_SESSION['__ci_vars']))
		{
			return [];
		}

		$keys = [];
		foreach (array_keys($_SESSION['__ci_vars']) as $key)
		{
			is_int($_SESSION['__ci_vars'][$key]) && $keys[] = $key;
		}

		return $keys;
	}

	//--------------------------------------------------------------------

	/**
	 * Sets the driver as the session handler in PHP.
	 * Extracted for easier testing.
	 */
	protected function setSaveHandler()
	{
		session_set_save_handler($this->driver, true);
	}

	//--------------------------------------------------------------------

	/**
	 * Starts the session.
	 * Extracted for testing reasons.
	 */
	protected function startSession()
	{
		if (ENVIRONMENT === 'testing')
		{
			$_SESSION = [];
			return;
		}

		// @codeCoverageIgnoreStart
		session_start();
		// @codeCoverageIgnoreEnd
	}

	//--------------------------------------------------------------------

	/**
	 * Takes care of setting the cookie on the client side.
	 * Extracted for testing reasons.
	 */
	protected function setCookie()
	{
		if (PHP_VERSION_ID < 70300)
		{
			$sameSite = '';
			if ($this->cookieSameSite !== '')
			{
				$sameSite = '; samesite=' . $this->cookieSameSite;
			}

			setcookie(
				$this->sessionCookieName,
				session_id(),
				empty($this->sessionExpiration) ? 0 : time() + $this->sessionExpiration,
				$this->cookiePath . $sameSite, // Hacky way to set SameSite for PHP 7.2 and earlier
				$this->cookieDomain,
				$this->cookieSecure,
				true
			);
		}
		else
		{
			// PHP 7.3 adds another function signature allowing setting of samesite
			$params = [
				'expires'  => empty($this->sessionExpiration) ? 0 : time() + $this->sessionExpiration,
				'path'     => $this->cookiePath,
				'domain'   => $this->cookieDomain,
				'secure'   => $this->cookieSecure,
				'httponly' => true,
			];

			if ($this->cookieSameSite !== '')
			{
				$params['samesite'] = $this->cookieSameSite;
			}

			// @phpstan-ignore-next-line @todo ignore to be removed in 4.1 with rector 0.9
			setcookie($this->sessionCookieName, session_id(), $params);
		}
	}

	//--------------------------------------------------------------------
}

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