s3: Force a prefix removal using a special header (#12504)

An S3 client can send `x-minio-force-delete: true` to remove a prefix.

cmd/erasure-object.go

@@ -1014,10 +1014,34 @@ func (er erasureObjects) DeleteObjects(ctx context.Context, bucket string, objec
 	return dobjects, errs
 }
 
+func (er erasureObjects) deletePrefix(ctx context.Context, bucket, prefix string) error {
+	disks := er.getDisks()
+	g := errgroup.WithNErrs(len(disks))
+	for index := range disks {
+		index := index
+		g.Go(func() error {
+			if disks[index] == nil {
+				return nil
+			}
+			return disks[index].Delete(ctx, bucket, prefix, true)
+		}, index)
+	}
+	for _, err := range g.Wait() {
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 // DeleteObject - deletes an object, this call doesn't necessary reply
 // any error as it is not necessary for the handler to reply back a
 // response to the client request.
 func (er erasureObjects) DeleteObject(ctx context.Context, bucket, object string, opts ObjectOptions) (objInfo ObjectInfo, err error) {
+	if opts.DeletePrefix {
+		return ObjectInfo{}, toObjectErr(er.deletePrefix(ctx, bucket, object), bucket, object)
+	}
+
 	versionFound := true
 	objInfo = ObjectInfo{VersionID: opts.VersionID} // version id needed in Delete API response.
 	goi, gerr := er.GetObjectInfo(ctx, bucket, object, opts)