S3: Auto create bucket (#7549)

* auto create buckets

* only admin users can auto create buckets

* Update weed/s3api/s3api_bucket_handlers.go

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* validate bucket name

* refactor

* error handling

* error

* refetch

* ensure owner

* multiple errors

---------

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/weed/s3api/s3api_object_handlers_multipart.go b/weed/s3api/s3api_object_handlers_multipart.go
index ba9886d66..2d9f8e620 100644
--- a/weed/s3api/s3api_object_handlers_multipart.go
+++ b/weed/s3api/s3api_object_handlers_multipart.go
@@ -33,8 +33,14 @@ const (
 func (s3a *S3ApiServer) NewMultipartUploadHandler(w http.ResponseWriter, r *http.Request) {
 	bucket, object := s3_constants.GetBucketAndObject(r)
 
-	// Check if bucket exists before creating multipart upload
-	if err := s3a.checkBucket(r, bucket); err != s3err.ErrNone {
+	// Check if bucket exists, and create it if it doesn't (auto-create bucket)
+	if err := s3a.checkBucket(r, bucket); err == s3err.ErrNoSuchBucket {
+		// Auto-create bucket if it doesn't exist (requires Admin permission)
+		if !s3a.handleAutoCreateBucket(w, r, bucket, "NewMultipartUploadHandler") {
+			return
+		}
+	} else if err != s3err.ErrNone {
+		// Other errors (like access denied) should still fail
 		s3err.WriteErrorResponse(w, r, err)
 		return
 	}