Fix silent Cloudinary upload failure by checking resp.Error.Message

services/cloudinary.go

@@ -58,6 +58,12 @@ func UploadToCloudinary(fileHeader *multipart.FileHeader) (string, error) {
 		return "", fmt.Errorf("gagal upload ke Cloudinary: %v", err)
 	}
 
+	// Cloudinary SDK does not return an error when credentials or cloud name are invalid,
+	// instead it populates the Error field in the response. We must check it!
+	if resp.Error.Message != "" {
+		return "", fmt.Errorf("cloudinary error: %s", resp.Error.Message)
+	}
+
 	log.Printf("[CLOUDINARY] Upload sukses! URL: %s", resp.SecureURL)
 	return resp.SecureURL, nil
 }