[#29] Implement ListObjectsV2

ListObjectsV1 and ListObjectsV2 now simplified and return different results

closes #29

Signed-off-by: Evgeniy Kulikov <kim@nspcc.ru>

api/handler/response.go

@@ -14,6 +14,37 @@ type ListBucketsResponse struct {
 	} // Buckets are nested
 }
 
+// ListObjectsV2Response - format for list objects response.
+type ListObjectsV2Response struct {
+	XMLName xml.Name `xml:"http://s3.amazonaws.com/doc/2006-03-01/ ListBucketResult" json:"-"`
+
+	Name       string
+	Prefix     string
+	StartAfter string `xml:"StartAfter,omitempty"`
+	// When response is truncated (the IsTruncated element value in the response
+	// is true), you can use the key name in this field as marker in the subsequent
+	// request to get next set of objects. Server lists objects in alphabetical
+	// order Note: This element is returned only if you have delimiter request parameter
+	// specified. If response does not include the NextMaker and it is truncated,
+	// you can use the value of the last Key in the response as the marker in the
+	// subsequent request to get the next set of object keys.
+	ContinuationToken     string `xml:"ContinuationToken,omitempty"`
+	NextContinuationToken string `xml:"NextContinuationToken,omitempty"`
+
+	KeyCount  int
+	MaxKeys   int
+	Delimiter string
+	// A flag that indicates whether or not ListObjects returned all of the results
+	// that satisfied the search criteria.
+	IsTruncated bool
+
+	Contents       []Object
+	CommonPrefixes []CommonPrefix
+
+	// Encoding type used to encode object keys in the response.
+	EncodingType string `xml:"EncodingType,omitempty"`
+}
+
 // Bucket container for bucket metadata
 type Bucket struct {
 	Name         string