fix: don't download when there are no files for the specified Key

internal/data-service/s3.go

@@ -38,6 +38,7 @@ func (s3Service *S3Service) Fetch(netAppKey, targetDir string) error {
 	// List all objects in the bucket
 	resp, err := s3Service.s3.ListObjectsV2(context.TODO(), &s3.ListObjectsV2Input{
 		Bucket: aws.String(s3Service.bucket),
+		Prefix: aws.String(netAppKey),
 	}, func(o *s3.Options) {
 		o.Region = s3Service.region
 	})
@@ -46,6 +47,15 @@ func (s3Service *S3Service) Fetch(netAppKey, targetDir string) error {
 		return err
 	}
 
+	if len(resp.Contents) == 0 {
+		path := filepath.Join(targetDir, netAppKey)
+		errCreateDir := util.EnsurePathExists(path)
+		if errCreateDir != nil {
+			return errCreateDir
+		}
+		fmt.Printf("No files to be downloaded")
+	}
+
 	for _, obj := range resp.Contents {
 		// Specify the local file path to save the object
 		sanitized := strings.Replace(*obj.Key, netAppKey+"/", "", 1)

internal/util/path-util.go

@@ -10,6 +10,10 @@ func EnsurePathToFileExists(path string) error {
 	return os.MkdirAll(dir, 0755)
 }
 
+func EnsurePathExists(path string) error {
+	return os.MkdirAll(path, 0755)
+}
+
 // ReadAllFiles lists all files form the directory including subdirectories
 func ReadAllFiles(root string) ([]os.DirEntry, error) {
 	var files []os.DirEntry