service_dav/lib/Auth/DavAuthBackend.php

<?php

declare(strict_types=1);

namespace KTXM\ServiceDav\Auth;

use KTXC\Service\SecurityService;
use KTXC\SessionIdentity;
use Sabre\DAV\Auth\Backend\AbstractBasic;
use Sabre\HTTP\RequestInterface;
use Sabre\HTTP\ResponseInterface;

class DavAuthBackend extends AbstractBasic
{
    public const PRINCIPAL_PREFIX = 'principals/';

    public function __construct(
        private readonly SessionIdentity $identity,
        private readonly SecurityService $securityService,
        string $realm = 'KTXC DAV',
    ) {
        $this->realm = $realm;
    }

    public function check(RequestInterface $request, ResponseInterface $response): array
    {
        if ($this->identity->identity() !== null) {
            $userId = $this->identity->identifier();
            return [true, self::PRINCIPAL_PREFIX . $userId];
        }

        return parent::check($request, $response);
    }

    protected function validateUserPass($username, $password): bool
    {
        $user = $this->securityService->authenticatePassword($username, $password);
        if ($user === null) {
            return false;
        }

        $this->identity->initialize($user, false);
        return true;
    }
}