image processing lambda

backend/services/s3Service.js

@@ -106,6 +106,15 @@ class S3Service {
     }
   }
 
+  /**
+   * Check if image processing (metadata stripping) is enabled
+   * When enabled, uploads go to staging/ prefix and Lambda processes them
+   * @returns {boolean}
+   */
+  isImageProcessingEnabled() {
+    return process.env.IMAGE_PROCESSING_ENABLED === "true";
+  }
+
   /**
    * Get a presigned URL for uploading a file directly to S3
    * @param {string} uploadType - Type of upload (profile, item, message, forum, condition-check)
@@ -113,7 +122,7 @@ class S3Service {
    * @param {string} fileName - Original filename (used for extension)
    * @param {number} fileSize - File size in bytes (required for size enforcement)
    * @param {string} [baseKey] - Optional base key (UUID) for coordinated variant uploads
-   * @returns {Promise<{uploadUrl: string, key: string, publicUrl: string, expiresAt: Date}>}
+   * @returns {Promise<{uploadUrl: string, key: string, stagingKey: string|null, publicUrl: string, expiresAt: Date}>}
    */
   async getPresignedUploadUrl(uploadType, contentType, fileName, fileSize, baseKey = null) {
     if (!this.enabled) {
@@ -150,12 +159,19 @@ class S3Service {
 
     // Use provided baseKey or generate new UUID
     const uuid = baseKey || uuidv4();
-    const key = `${config.folder}/${uuid}${suffix}${ext}`;
+
+    // Final key is where the processed image will be (what frontend stores in DB)
+    const finalKey = `${config.folder}/${uuid}${suffix}${ext}`;
+
+    // When image processing is enabled, upload to staging/ prefix
+    // Lambda will process and move to final location
+    const useStaging = this.isImageProcessingEnabled();
+    const uploadKey = useStaging ? `staging/${finalKey}` : finalKey;
 
     const cacheDirective = config.public ? "public" : "private";
     const command = new PutObjectCommand({
       Bucket: this.bucket,
-      Key: key,
+      Key: uploadKey,
       ContentType: contentType,
       ContentLength: fileSize, // Enforce exact file size
       CacheControl: `${cacheDirective}, max-age=${config.cacheMaxAge}`,
@@ -167,9 +183,10 @@ class S3Service {
 
     return {
       uploadUrl,
-      key,
+      key: finalKey, // Frontend stores this in database
+      stagingKey: useStaging ? uploadKey : null, // Actual upload location (if staging enabled)
       publicUrl: config.public
-        ? `https://${this.bucket}.s3.${this.region}.amazonaws.com/${key}`
+        ? `https://${this.bucket}.s3.${this.region}.amazonaws.com/${finalKey}`
         : null,
       expiresAt: new Date(Date.now() + PRESIGN_EXPIRY * 1000),
     };