Add a metadata service to store file metadata

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

1 files changed, 100 insertions, 0 deletions

diff --git a/lib/private/Metadata/MetadataManager.php b/lib/private/Metadata/MetadataManager.php
new file mode 100644
index 00000000000..69e9cb3c852
--- /dev/null
+++ b/lib/private/Metadata/MetadataManager.php
@@ -0,0 +1,100 @@
+<?php
+/**
+ * @copyright Copyright 2022 Carl Schwan <carl@carlschwan.eu>
+ * @license AGPL-3.0-or-later
+ *
+ * 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\Metadata;
+
+use OC\Metadata\Provider\ExifProvider;
+use OCP\Files\File;
+use OCP\IConfig;
+use Psr\Log\LoggerInterface;
+
+class MetadataManager implements IMetadataManager {
+	/** @var array<string, IMetadataProvider> */
+	private array $providers;
+	private array $providerClasses;
+	private FileMetadataMapper $fileMetadataMapper;
+	private IConfig $config;
+	private LoggerInterface $logger;
+
+	public function __construct(
+		FileMetadataMapper $fileMetadataMapper,
+		IConfig $config,
+		LoggerInterface $logger
+	) {
+		$this->providers = [];
+		$this->providerClasses = [];
+		$this->fileMetadataMapper = $fileMetadataMapper;
+		$this->config = $config;
+		$this->logger = $logger;
+
+		// TODO move to another place, where?
+		$this->registerProvider(ExifProvider::class);
+	}
+
+	/**
+	 * @param class-string<IMetadataProvider> $className
+	 */
+	public function registerProvider(string $className):void {
+		if (in_array($className, $this->providerClasses)) {
+			return;
+		}
+
+		if (call_user_func([$className, 'isAvailable'])) {
+			$this->providers[call_user_func([$className, 'getMimetypesSupported'])] = \OC::$server->get($className);
+		}
+	}
+
+	public function generateMetadata(File $file, bool $checkExisting = false): void {
+		$existingMetadataGroups = [];
+
+		if ($checkExisting) {
+			$existingMetadata = $this->fileMetadataMapper->findForFile($file->getId());
+			foreach ($existingMetadata as $metadata) {
+				$existingMetadataGroups[] = $metadata->getGroupName();
+			}
+		}
+
+		foreach ($this->providers as $supportedMimetype => $provider) {
+			if (preg_match($supportedMimetype, $file->getMimeType())) {
+				if (count(array_diff($provider::groupsProvided(), $existingMetadataGroups)) > 0) {
+					$metaDataGroup = $provider->execute($file);
+					foreach ($metaDataGroup as $group => $metadata) {
+						$this->fileMetadataMapper->insertOrUpdate($metadata);
+					}
+				}
+			}
+		}
+	}
+
+	public function clearMetadata(int $fileId): void {
+		$this->fileMetadataMapper->clear($fileId);
+	}
+
+	public function fetchMetadataFor(string $group, array $fileIds): array {
+		return $this->fileMetadataMapper->findForGroupForFiles($fileIds, $group);
+	}
+
+	public function getCapabilities(): array {
+		$capabilities = [];
+		foreach ($this->providers as $supportedMimetype => $provider) {
+			$capabilities[$supportedMimetype] = $provider::groupsProvided();
+		}
+		return $capabilities;
+	}
+}