refactor: replace custom CRM with Monica fork

app/Http/Controllers/DAV/Auth/AuthBackend.php

@@ -0,0 +1,80 @@
+<?php
+
+namespace App\Http\Controllers\DAV\Auth;
+
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+use Illuminate\Support\Facades\Auth;
+use Sabre\DAV\Auth\Backend\BackendInterface;
+use App\Http\Controllers\DAV\DAVACL\PrincipalBackend;
+
+class AuthBackend implements BackendInterface
+{
+    /**
+     * Authentication Realm.
+     *
+     * The realm is often displayed by browser clients when showing the
+     * authentication dialog.
+     *
+     * @var string
+     */
+    protected $realm = 'sabre/dav';
+
+    /**
+     * Sets the authentication realm for this backend.
+     *
+     * @param  string  $realm
+     * @return void
+     */
+    public function setRealm($realm)
+    {
+        $this->realm = $realm;
+    }
+
+    /**
+     * Check Laravel authentication.
+     *
+     * @param  RequestInterface  $request
+     * @param  ResponseInterface  $response
+     * @return array
+     */
+    public function check(RequestInterface $request, ResponseInterface $response)
+    {
+        if (! Auth::check()) {
+            return [false, 'User is not authenticated'];
+        }
+
+        return [true, PrincipalBackend::getPrincipalUser(Auth::user())];
+    }
+
+    /**
+     * This method is called when a user could not be authenticated, and
+     * authentication was required for the current request.
+     *
+     * This gives you the opportunity to set authentication headers. The 401
+     * status code will already be set.
+     *
+     * In this case of Bearer Auth, this would for example mean that the
+     * following header needs to be set:
+     *
+     * $response->addHeader('WWW-Authenticate', 'Bearer realm=SabreDAV');
+     *
+     * Keep in mind that in the case of multiple authentication backends, other
+     * WWW-Authenticate headers may already have been set, and you'll want to
+     * append your own WWW-Authenticate header instead of overwriting the
+     * existing one.
+     *
+     * @param  RequestInterface  $request
+     * @param  ResponseInterface  $response
+     * @return void
+     */
+    public function challenge(RequestInterface $request, ResponseInterface $response)
+    {
+        $auth = new \Sabre\HTTP\Auth\Bearer(
+            $this->realm,
+            $request,
+            $response
+        );
+        $auth->requireLogin();
+    }
+}