don't iterate files or folders of list objects if they are nil

internal/dao/buck_obj.go

@@ -29,12 +29,12 @@ func (bo *BObj) List(ctx context.Context) ([]Object, error) {
 	bucketInfo := aws.GetInfoAboutBucket(*sess, bucketName, "/", fn)
 	folderArrayInfo, fileArrayInfo := getBucLevelInfo(bucketInfo)
 	var s3Objects []aws.S3Object
-	if len(folderArrayInfo) != 0 || len(fileArrayInfo) != 0 {
-		s3Objects = setFoldersAndFiles(bucketInfo.CommonPrefixes, bucketInfo.Contents)
-	} else {
+	if len(folderArrayInfo) == 0 && len(fileArrayInfo) == 0 {
 		s3Objects = append(s3Objects, aws.S3Object{
 			Name: "No objects found",
 		})
+	} else {
+		s3Objects = setFoldersAndFiles(bucketInfo.CommonPrefixes, bucketInfo.Contents)
 	}
 	objs := make([]Object, len(s3Objects))
 	for i, obj := range s3Objects {
@@ -62,33 +62,37 @@ func getBucLevelInfo(bucketInfo *s3.ListObjectsV2Output) ([]string, []string) {
 	return folderArrayInfo, fileArrayInfo
 }
 
-func setFoldersAndFiles(Folder []*s3.CommonPrefix, File []*s3.Object) []aws.S3Object {
+func setFoldersAndFiles(folders []*s3.CommonPrefix, files []*s3.Object) []aws.S3Object {
 	var s3Objects []aws.S3Object
 	indx := 0
-	for _, bi := range Folder {
-		keyA := strings.Split(*bi.Prefix, "/")
-		o := aws.S3Object{
-			Name:         keyA[len(keyA)-2],
-			ObjectType:   "Folder",
-			LastModified: "-",
-			Size:         "-",
-			StorageClass: "-",
+	if len(folders) != 0 {
+		for _, bi := range folders {
+			keyA := strings.Split(*bi.Prefix, "/")
+			o := aws.S3Object{
+				Name:         keyA[len(keyA)-2],
+				ObjectType:   "Folder",
+				LastModified: "-",
+				Size:         "-",
+				StorageClass: "-",
+			}
+			s3Objects = append(s3Objects, o)
+			indx++
 		}
-		s3Objects = append(s3Objects, o)
-		indx++
 	}
 
-	for _, fi := range File {
-		keyA := strings.Split(*fi.Key, "/")
-		o := aws.S3Object{
-			Name:         keyA[len(keyA)-1],
-			ObjectType:   "File",
-			LastModified: fi.LastModified.String(),
-			Size:         humanize.Bytes(uint64(*fi.Size)),
-			StorageClass: *fi.StorageClass,
+	if len(files) != 0 {
+		for _, fi := range files {
+			keyA := strings.Split(*fi.Key, "/")
+			o := aws.S3Object{
+				Name:         keyA[len(keyA)-1],
+				ObjectType:   "File",
+				LastModified: fi.LastModified.String(),
+				Size:         humanize.Bytes(uint64(*fi.Size)),
+				StorageClass: *fi.StorageClass,
+			}
+			s3Objects = append(s3Objects, o)
+			indx++
 		}
-		s3Objects = append(s3Objects, o)
-		indx++
 	}
 
 	return s3Objects