kernelsession.php

См. документацию.

<?php
 
namespace Bitrix\Main\Session;
 
use Bitrix\Main\NotSupportedException;
use Bitrix\Main\Security\Random;
use Bitrix\Main\Session\Handlers\CookieSessionHandler;
 
class KernelSession implements SessionInterface, \ArrayAccess
{
    use ArrayAccessWithReferences;
 
    public const COOKIE_NAME = 'kernel';

    protected $started;
    protected $sessionHandler;
    private $lifetime = 0;
    private $id;
    private $hash;
 
    public function __construct(int $lifetime = 0)
    {
        $this->lifetime = $lifetime;
    }
 
    public function isActive(): bool
    {
        return $this->isStarted();
    }
 
    public function isAccessible(): bool
    {
        return true;
    }
 
    public function getId(): string
    {
        return $this->id;
    }
 
    public function setId($id)
    {
        throw new NotSupportedException();
    }
 
    public function getName(): string
    {
        throw new NotSupportedException();
    }
 
    public function setName($name)
    {
        throw new NotSupportedException();
    }

    public function getSessionHandler(): \SessionHandlerInterface
    {
        return $this->sessionHandler;
    }
 
    final protected function hashData(string $data): string
    {
        return hash('sha512', $data);
    }
 
    public function start(): bool
    {
        if ($this->isStarted())
        {
            return true;
        }
 
        $this->started = true;
        $this->sessionHandler = new CookieSessionHandler($this->lifetime);
        $data = $this->getSessionHandler()->read(self::COOKIE_NAME);
        $this->hash = $this->hashData($data);
        $this->sessionData = unserialize($data, ['allowed_classes' => false]) ?: [];
        if (!isset($this->sessionData['_id']))
        {
            $this->sessionData['_id'] = Random::getString(32, true);
        }
        $this->id = $this->sessionData['_id'];
 
        return true;
    }
 
    public function regenerateId(): bool
    {
        return true;
    }
 
    public function destroy()
    {
        if ($this->isActive())
        {
            $this->clear();
        }
    }
 
    public function save()
    {
        $this->refineReferencesBeforeSave();
        $data = serialize($this->sessionData);
 
        if ($this->hashData($data) !== $this->hash)
        {
            $this->getSessionHandler()->write(self::COOKIE_NAME, $data);
        }
        $this->started = false;
    }
 
    public function clear()
    {
        $this->sessionData = [];
        $this->nullPointers = [];
    }
 
    public function isStarted()
    {
        return (bool)$this->started;
    }
}