feat: Add ListBucketsWithMetadata extension API (#13219)

cmd/api-response.go

@@ -240,6 +240,16 @@ type CommonPrefix struct {
 type Bucket struct {
 	Name         string
 	CreationDate string // time string of format "2006-01-02T15:04:05.000Z"
+
+	// Usage size of the bucket not reflective of
+	// actual usage atomically, but an ever increasing
+	// value.
+	Usage *BucketUsageInfo `xml:"Usage,omitempty"`
+
+	// Provides information about various bucket features
+	// enabled such as versioning, object locking, tagging
+	// quota, replication config etc.
+	Details *BucketDetailsInfo `xml:"Details,omitempty"`
 }
 
 // ObjectVersion container for object version metadata
@@ -263,7 +273,7 @@ func (o ObjectVersion) MarshalXML(e *xml.Encoder, start xml.StartElement) error
 	return e.EncodeElement(objectVersionWrapper(o), start)
 }
 
-// StringMap is a map[string]string.
+// StringMap is a map[string]string
 type StringMap map[string]string
 
 // MarshalXML - StringMap marshals into XML.
@@ -424,10 +434,12 @@ func generateListBucketsResponse(buckets []BucketInfo) ListBucketsResponse {
 	}
 
 	for _, bucket := range buckets {
-		var listbucket = Bucket{}
-		listbucket.Name = bucket.Name
-		listbucket.CreationDate = bucket.Created.UTC().Format(iso8601TimeFormat)
-		listbuckets = append(listbuckets, listbucket)
+		listbuckets = append(listbuckets, Bucket{
+			Name:         bucket.Name,
+			CreationDate: bucket.Created.UTC().Format(iso8601TimeFormat),
+			Usage:        bucket.Usage,
+			Details:      bucket.Details,
+		})
 	}
 
 	data.Owner = owner