Adding etag to headers

pkg/storage/inmemory/inmemory.go

@@ -150,3 +150,9 @@ func isValidBucket(bucket string) bool {
 	}
 	return valid
 }
+
+func (storage *Storage) GetObjectMetadata(bucket, key string) mstorage.ObjectMetadata {
+	objectKey := bucket + ":" + key
+
+	return storage.objectdata[objectKey].metadata
+}

pkg/storage/storage.go

@@ -26,6 +26,7 @@ type Storage interface {
 	ListBuckets(prefix string) []BucketMetadata
 
 	// Object Operations
+	GetObjectMetadata(bucket string, object string) ObjectMetadata
 	CopyObjectToWriter(w io.Writer, bucket string, object string) (int64, error)
 	StoreObject(bucket string, key string, data io.Reader) error
 	ListObjects(bucket, prefix string, count int) []ObjectMetadata

pkg/webapi/minioapi/minioapi.go

@@ -55,6 +55,11 @@ func (server *minioApi) getObjectHandler(w http.ResponseWriter, req *http.Reques
 	bucket := vars["bucket"]
 	object := vars["object"]
 
+	metadata := server.storage.GetObjectMetadata(bucket, object)
+	lastModifiedTime := time.Unix(metadata.SecCreated, 0)
+	lastModified := lastModifiedTime.Format(time.RFC1123)
+	w.Header().Set("ETag", metadata.ETag)
+	w.Header().Set("Last-Modified", lastModified)
 	_, err := server.storage.CopyObjectToWriter(w, bucket, object)
 	switch err := err.(type) {
 	case nil: // success