other: add describe API

Signed-off-by: Varun Patil <radialapps@gmail.com>

appinfo/routes.php

@@ -86,6 +86,7 @@ return [
         // Config
         ['name' => 'Other#setUserConfig', 'url' => '/api/config/{key}', 'verb' => 'PUT'],
         ['name' => 'Other#getUserConfig', 'url' => '/api/config', 'verb' => 'GET'],
+        ['name' => 'Other#describeApi', 'url' => '/api/describe', 'verb' => 'GET'],
 
         // Admin
         ['name' => 'Admin#getSystemStatus', 'url' => '/api/system-status', 'verb' => 'GET'],

lib/Controller/GenericApiController.php

@@ -27,7 +27,7 @@ use OCA\Memories\AppInfo\Application;
 use OCA\Memories\Db\FsManager;
 use OCA\Memories\Db\TimelineQuery;
 use OCP\App\IAppManager;
-use OCP\AppFramework\Controller;
+use OCP\AppFramework\ApiController;
 use OCP\Files\IRootFolder;
 use OCP\IConfig;
 use OCP\IDBConnection;
@@ -35,7 +35,7 @@ use OCP\IRequest;
 use OCP\IUserSession;
 use Psr\Log\LoggerInterface;
 
-abstract class GenericApiController extends Controller
+abstract class GenericApiController extends ApiController
 {
     protected IConfig $config;
     protected IUserSession $userSession;

lib/Controller/OtherController.php

@@ -98,6 +98,31 @@ class OtherController extends GenericApiController
         });
     }
 
+    /**
+     * @NoAdminRequired
+     *
+     * @PublicPage
+     *
+     * @NoCSRFRequired
+     */
+    public function describeApi(): JSONResponse
+    {
+        return Util::guardEx(function () {
+            $appManager = \OC::$server->get(\OCP\App\IAppManager::class);
+            $urlGenerator = \OC::$server->get(\OCP\IURLGenerator::class);
+
+            $res = new JSONResponse([
+                'version' => $appManager->getAppInfo('memories')['version'],
+                'baseUrl' => $urlGenerator->linkToRouteAbsolute('memories.Page.main'),
+            ]);
+
+            // This is public information
+            $res->addHeader('Access-Control-Allow-Origin', '*');
+
+            return $res;
+        });
+    }
+
     /**
      * @NoAdminRequired
      *