feat: store original storage id and path in object store metadata

Signed-off-by: Robin Appelman <robin@icewind.nl>

lib/private/Files/ObjectStore/ObjectStoreStorage.php

@@ -482,6 +482,8 @@ class ObjectStoreStorage extends \OC\Files\Storage\Common implements IChunkedFil
 		$mimetype = $mimetypeDetector->detectPath($path);
 		$metadata = [
 			'mimetype' => $mimetype,
+			'original-storage' => $this->getId(),
+			'original-path' => $path,
 		];
 
 		$stat['mimetype'] = $mimetype;

lib/private/Files/ObjectStore/S3.php

@@ -95,6 +95,16 @@ class S3 implements IObjectStore, IObjectStoreMultiPartUpload, IObjectStoreMetaD
 		]);
 	}
 
+	private function parseS3Metadata(array $metadata): array {
+		$result = [];
+		foreach ($metadata as $key => $value) {
+			if (str_starts_with($key, 'x-amz-meta-')) {
+				$result[substr($key, strlen('x-amz-meta-'))] = $value;
+			}
+		}
+		return $result;
+	}
+
 	public function getObjectMetaData(string $urn): array {
 		$object = $this->getConnection()->headObject([
 			'Bucket' => $this->bucket,
@@ -104,7 +114,7 @@ class S3 implements IObjectStore, IObjectStoreMultiPartUpload, IObjectStoreMetaD
 			'mtime' => $object['LastModified'],
 			'etag' => trim($object['ETag'], '"'),
 			'size' => (int)($object['Size'] ?? $object['ContentLength']),
-		];
+		] + $this->parseS3Metadata($object['Metadata'] ?? []);
 	}
 
 	public function listObjects(string $prefix = ''): \Iterator {

lib/private/Files/ObjectStore/S3ObjectTrait.php

@@ -77,6 +77,13 @@ trait S3ObjectTrait {
 		return $fh;
 	}
 
+	private function buildS3Metadata(array $metadata): array {
+		$result = [];
+		foreach ($metadata as $key => $value) {
+			$result['x-amz-meta-' . $key] = $value;
+		}
+		return $result;
+	}
 
 	/**
 	 * Single object put helper
@@ -87,12 +94,15 @@ trait S3ObjectTrait {
 	 * @throws \Exception when something goes wrong, message will be logged
 	 */
 	protected function writeSingle(string $urn, StreamInterface $stream, array $metaData): void {
+		$mimetype = $metaData['mimetype'] ?? null;
+		unset($metaData['mimetype']);
 		$this->getConnection()->putObject([
 			'Bucket' => $this->bucket,
 			'Key' => $urn,
 			'Body' => $stream,
 			'ACL' => 'private',
-			'ContentType' => $metaData['mimetype'] ?? null,
+			'ContentType' => $mimetype,
+			'Metadata' => $this->buildS3Metadata($metaData),
 			'StorageClass' => $this->storageClass,
 		] + $this->getSSECParameters());
 	}
@@ -107,13 +117,16 @@ trait S3ObjectTrait {
 	 * @throws \Exception when something goes wrong, message will be logged
 	 */
 	protected function writeMultiPart(string $urn, StreamInterface $stream, array $metaData): void {
+		$mimetype = $metaData['mimetype'] ?? null;
+		unset($metaData['mimetype']);
 		$uploader = new MultipartUploader($this->getConnection(), $stream, [
 			'bucket' => $this->bucket,
 			'concurrency' => $this->concurrency,
 			'key' => $urn,
 			'part_size' => $this->uploadPartSize,
 			'params' => [
-				'ContentType' => $metaData['mimetype'] ?? null,
+				'ContentType' => $mimetype,
+				'Metadata' => $this->buildS3Metadata($metaData),
 				'StorageClass' => $this->storageClass,
 			] + $this->getSSECParameters(),
 		]);

lib/public/Files/ObjectStore/IObjectStoreMetaData.php

@@ -9,7 +9,7 @@ namespace OCP\Files\ObjectStore;
 /**
  * Interface IObjectStoreMetaData
  *
- * @psalm-type ObjectMetaData = array{mtime?: \DateTime, etag?: string, size?: int, mimetype?: string, filename?: string}
+ * @psalm-type ObjectMetaData = array{mtime?: \DateTime, etag?: string, size?: int, mimetype?: string, filename?: string, original-path?: string, original-storage?: string}
  *
  * @since 32.0.0
  */