Add support for labels: subscribeTo / unsubscribeFrom (#287)

labels.go

@@ -162,3 +162,59 @@ func (s *LabelsService) UpdateLabel(pid interface{}, opt *UpdateLabelOptions, op
 
 	return l, resp, err
 }
+
+// SubscribeToLabel subscribes the authenticated user to a label to receive
+// notifications. If the user is already subscribed to the label,
+// the status code 304 is returned.
+//
+// GitLab API docs:
+// https://docs.gitlab.com/ce/api/labels.html#subscribe-to-a-label
+func (s *LabelsService) SubscribeToLabel(pid interface{}, labelID interface{}, options ...OptionFunc) (*Label, *Response, error) {
+	project, err := parseID(pid)
+	if err != nil {
+		return nil, nil, err
+	}
+	label, err := parseID(labelID)
+	if err != nil {
+		return nil, nil, err
+	}
+	u := fmt.Sprintf("projects/%s/labels/%s/subscribe", url.QueryEscape(project), label)
+
+	req, err := s.client.NewRequest("POST", u, nil, options)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	l := new(Label)
+	resp, err := s.client.Do(req, l)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return l, resp, err
+}
+
+// UnsubscribeFromLabel unsubscribes the authenticated user from a label
+// to not receive notifications from it. If the user is not subscribed
+// to the label, the status code 304 is returned.
+//
+// GitLab API docs:
+// https://docs.gitlab.com/ce/api/labels.html#unsubscribe-from-a-label
+func (s *LabelsService) UnsubscribeFromLabel(pid interface{}, labelID interface{}, options ...OptionFunc) (*Response, error) {
+	project, err := parseID(pid)
+	if err != nil {
+		return nil, err
+	}
+	label, err := parseID(labelID)
+	if err != nil {
+		return nil, err
+	}
+	u := fmt.Sprintf("projects/%s/labels/%s/unsubscribe", url.QueryEscape(project), label)
+
+	req, err := s.client.NewRequest("POST", u, nil, options)
+	if err != nil {
+		return nil, err
+	}
+
+	return s.client.Do(req, nil)
+}