add option to use an existing s3 client.

storage.go

@@ -42,6 +42,9 @@ type Config struct {
 	S3AccessKey string
 
 	S3BucketName string
+
+	// Override default s3 client.
+	MinioClient *minio.Client
 }
 
 // New creates a new storage interface
@@ -54,6 +57,9 @@ func New(config Config) (*Storage, error) {
 
 	switch config.Type {
 	case "minio", "s3":
+		if config.MinioClient != nil {
+			newStorage.s3Client = config.MinioClient
+		} else {
 			s3Client, err := minio.New(config.S3Endpoint, &minio.Options{
 				Creds:  credentials.NewStaticV4(config.S3AccessID, config.S3AccessKey, ""),
 				Secure: config.S3Secure,
@@ -61,19 +67,19 @@ func New(config Config) (*Storage, error) {
 			if err != nil {
 				return nil, err
 			}
+			newStorage.s3Client = s3Client
+		}
 
-		bucketExists, err := s3Client.BucketExists(newStorage.ctx, config.S3BucketName)
+		bucketExists, err := newStorage.s3Client.BucketExists(newStorage.ctx, config.S3BucketName)
 		if err != nil {
 			return nil, err
 		}
 
 		if !bucketExists {
-			if err := s3Client.MakeBucket(newStorage.ctx, config.S3BucketName, minio.MakeBucketOptions{}); err != nil {
+			if err := newStorage.s3Client.MakeBucket(newStorage.ctx, config.S3BucketName, minio.MakeBucketOptions{}); err != nil {
 				return nil, err
 			}
 		}
-
-		newStorage.s3Client = s3Client
 	case "local":
 		if statInfo, err := os.Stat(config.Path); err != nil && errors.Is(err, fs.ErrNotExist) {
 			if err := os.MkdirAll(config.Path, 0740); err != nil {