fix(server): avoid get object content when syncing (#9402)

packages/backend/server/src/plugins/storage/providers/s3.ts

@@ -1,9 +1,10 @@
-/* eslint-disable @typescript-eslint/no-non-null-assertion */
+/* oxlint-disable @typescript-eslint/no-non-null-assertion */
 import { Readable } from 'node:stream';
 
 import {
   DeleteObjectCommand,
   GetObjectCommand,
+  HeadObjectCommand,
   ListObjectsV2Command,
   NoSuchKey,
   PutObjectCommand,
@@ -75,6 +76,34 @@ export class S3StorageProvider implements StorageProvider {
     }
   }
 
+  async head(key: string) {
+    try {
+      const obj = await this.client.send(
+        new HeadObjectCommand({
+          Bucket: this.bucket,
+          Key: key,
+        })
+      );
+
+      return {
+        contentType: obj.ContentType!,
+        contentLength: obj.ContentLength!,
+        lastModified: obj.LastModified!,
+        checksumCRC32: obj.ChecksumCRC32,
+      };
+    } catch (e) {
+      // 404
+      if (e instanceof NoSuchKey) {
+        this.logger.verbose(`Object \`${key}\` not found`);
+        return undefined;
+      } else {
+        throw new Error(`Failed to head object \`${key}\``, {
+          cause: e,
+        });
+      }
+    }
+  }
+
   async get(key: string): Promise<{
     body?: Readable;
     metadata?: GetObjectMetadata;