Initial service DAV module

lib/Auth/DavAuthBackend.php

@@ -0,0 +1,45 @@
+<?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;
+    }
+}