Add a metadata service to store file metadata

Signed-off-by: Carl Schwan <carl@carlschwan.eu>

2 files changed, 77 insertions, 0 deletions

diff --git a/core/Application.php b/core/Application.php
index 545588ab208..34932cab183 100644
--- a/core/Application.php
+++ b/core/Application.php
@@ -48,12 +48,17 @@ use OC\DB\MissingColumnInformation;
 use OC\DB\MissingIndexInformation;
 use OC\DB\MissingPrimaryKeyInformation;
 use OC\DB\SchemaWrapper;
+use OC\Metadata\FileEventListener;
 use OCP\AppFramework\App;
 use OCP\EventDispatcher\IEventDispatcher;
+use OCP\Files\Events\Node\NodeDeletedEvent;
+use OCP\Files\Events\Node\NodeWrittenEvent;
+use OCP\Files\Events\NodeRemovedFromCache;
 use OCP\IDBConnection;
 use OCP\User\Events\BeforeUserDeletedEvent;
 use OCP\User\Events\UserDeletedEvent;
 use OCP\Util;
+use OCP\IConfig;
 use Symfony\Component\EventDispatcher\GenericEvent;
 
 /**
@@ -301,5 +306,15 @@ class Application extends App {
 		$eventDispatcher->addServiceListener(BeforeUserDeletedEvent::class, UserDeletedFilesCleanupListener::class);
 		$eventDispatcher->addServiceListener(UserDeletedEvent::class, UserDeletedFilesCleanupListener::class);
 		$eventDispatcher->addServiceListener(UserDeletedEvent::class, UserDeletedWebAuthnCleanupListener::class);
+
+		// Metadata
+		/** @var IConfig $config */
+		$config = $container->get(IConfig::class);
+		if ($config->getSystemValueBool('enable_file_metadata', true)) {
+			$eventDispatcher = \OC::$server->get(IEventDispatcher::class);
+			$eventDispatcher->addServiceListener(NodeDeletedEvent::class, FileEventListener::class);
+			$eventDispatcher->addServiceListener(NodeRemovedFromCache::class, FileEventListener::class);
+			$eventDispatcher->addServiceListener(NodeWrittenEvent::class, FileEventListener::class);
+		}
 	}
 }
diff --git a/core/Migrations/Version240000Date20220404230027.php b/core/Migrations/Version240000Date20220404230027.php
new file mode 100644
index 00000000000..f45f8d5b500
--- /dev/null
+++ b/core/Migrations/Version240000Date20220404230027.php
@@ -0,0 +1,62 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * @copyright Copyright 2022 Carl Schwan <carl@carlschwan.eu>
+ *
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program. If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OC\Core\Migrations;
+
+use Closure;
+use OCP\DB\ISchemaWrapper;
+use OCP\DB\Types;
+use OCP\Migration\IOutput;
+use OCP\Migration\SimpleMigrationStep;
+
+/**
+ * Add oc_file_metadata table
+ * @see OC\Metadata\FileMetadata
+ */
+class Version240000Date20220404230027 extends SimpleMigrationStep {
+	/**
+	 * @param IOutput $output
+	 * @param Closure $schemaClosure The `\Closure` returns a `ISchemaWrapper`
+	 * @param array $options
+	 * @return null|ISchemaWrapper
+	 */
+	public function changeSchema(IOutput $output, Closure $schemaClosure, array $options): ?ISchemaWrapper {
+		/** @var ISchemaWrapper $schema */
+		$schema = $schemaClosure();
+
+		if (!$schema->hasTable('file_metadata')) {
+			$table = $schema->createTable('file_metadata');
+			$table->addColumn('id', Types::INTEGER, [
+				'notnull' => true,
+			]);
+			$table->addColumn('group_name', Types::STRING, [
+				'notnull' => true,
+				'length' => 50,
+			]);
+			$table->addColumn('metadata', Types::JSON, [
+				'notnull' => true,
+			]);
+			$table->setPrimaryKey(['id', 'group_name'], 'file_metadata_idx');
+		}
+		return $schema;
+	}
+}