Add support for group labels api

Signed-off-by: kirecek <erikjankovic@gmail.com>

group_labels.go

+//
+// Copyright 2017, Sander van Harmelen
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package gitlab
+
+import (
+	"fmt"
+	"net/url"
+)
+
+// GroupLabelsService handles communication with the label related methods of the
+// GitLab API.
+//
+// GitLab API docs: https://docs.gitlab.com/ce/api/group_labels.html
+type GroupLabelsService struct {
+	client *Client
+}
+
+// GroupLabel represents a GitLab group label.
+//
+// GitLab API docs: https://docs.gitlab.com/ce/api/group_labels.html
+type GroupLabel Label
+
+func (l GroupLabel) String() string {
+	return Stringify(l)
+}
+
+// ListGroupLabelsOptions represents the available ListGroupLabels() options.
+//
+// GitLab API docs: https://docs.gitlab.com/ce/api/labels.html#list-labels
+type ListGroupLabelsOptions ListOptions
+
+// ListGroupLabels gets all labels for given group.
+//
+// GitLab API docs: https://docs.gitlab.com/ce/api/group_labels.html#list-group-labels
+func (s *GroupLabelsService) ListGroupLabels(gid interface{}, opt *ListGroupLabelsOptions, options ...OptionFunc) ([]*GroupLabel, *Response, error) {
+	group, err := parseID(gid)
+	if err != nil {
+		return nil, nil, err
+	}
+	u := fmt.Sprintf("groups/%s/labels", url.QueryEscape(group))
+
+	req, err := s.client.NewRequest("GET", u, opt, options)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	var l []*GroupLabel
+	resp, err := s.client.Do(req, &l)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return l, resp, err
+}
+
+// CreateGroupLabelOptions represents the available CreateGroupLabel() options.
+//
+// GitLab API docs: https://docs.gitlab.com/ce/api/group_labels.html#create-a-new-group-label
+type CreateGroupLabelOptions CreateLabelOptions
+
+// CreateGroupLabel creates a new label for given group with given name and
+// color.
+//
+// GitLab API docs: https://docs.gitlab.com/ce/api/group_labels.html#create-a-new-group-label
+func (s *GroupLabelsService) CreateGroupLabel(gid interface{}, opt *CreateGroupLabelOptions, options ...OptionFunc) (*GroupLabel, *Response, error) {
+	group, err := parseID(gid)
+	if err != nil {
+		return nil, nil, err
+	}
+	u := fmt.Sprintf("groups/%s/labels", url.QueryEscape(group))
+
+	req, err := s.client.NewRequest("POST", u, opt, options)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	l := new(GroupLabel)
+	resp, err := s.client.Do(req, l)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return l, resp, err
+}
+
+// DeleteGroupLabelOptions represents the available DeleteGroupLabel() options.
+//
+// GitLab API docs: https://docs.gitlab.com/ce/api/group_labels.html#delete-a-group-label
+type DeleteGroupLabelOptions DeleteLabelOptions
+
+// DeleteGroupLabel deletes a group label given by its name.
+//
+// GitLab API docs: https://docs.gitlab.com/ce/api/labels.html#delete-a-label
+func (s *GroupLabelsService) DeleteGroupLabel(gid interface{}, opt *DeleteGroupLabelOptions, options ...OptionFunc) (*Response, error) {
+	group, err := parseID(gid)
+	if err != nil {
+		return nil, err
+	}
+	u := fmt.Sprintf("groups/%s/labels", url.QueryEscape(group))
+
+	req, err := s.client.NewRequest("DELETE", u, opt, options)
+	if err != nil {
+		return nil, err
+	}
+
+	return s.client.Do(req, nil)
+}
+
+// UpdateGroupLabelOptions represents the available UpdateGroupLabel() options.
+//
+// GitLab API docs: https://docs.gitlab.com/ce/api/group_labels.html#update-a-group-label
+type UpdateGroupLabelOptions UpdateLabelOptions
+
+// UpdateGroupLabel updates an existing label with new name or now color. At least
+// one parameter is required, to update the label.
+//
+// GitLab API docs: https://docs.gitlab.com/ce/api/labels.html#edit-an-existing-label
+func (s *GroupLabelsService) UpdateGroupLabel(gid interface{}, opt *UpdateGroupLabelOptions, options ...OptionFunc) (*GroupLabel, *Response, error) {
+	group, err := parseID(gid)
+	if err != nil {
+		return nil, nil, err
+	}
+	u := fmt.Sprintf("groups/%s/labels", url.QueryEscape(group))
+
+	req, err := s.client.NewRequest("PUT", u, opt, options)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	l := new(GroupLabel)
+	resp, err := s.client.Do(req, l)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return l, resp, err
+}
+
+// SubscribeToGroupLabel 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/group_labels.html#subscribe-to-a-group-label
+func (s *GroupLabelsService) SubscribeToGroupLabel(gid interface{}, labelID interface{}, options ...OptionFunc) (*GroupLabel, *Response, error) {
+	group, err := parseID(gid)
+	if err != nil {
+		return nil, nil, err
+	}
+	label, err := parseID(labelID)
+	if err != nil {
+		return nil, nil, err
+	}
+	u := fmt.Sprintf("groups/%s/labels/%s/subscribe", url.QueryEscape(group), label)
+
+	req, err := s.client.NewRequest("POST", u, nil, options)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	l := new(GroupLabel)
+	resp, err := s.client.Do(req, l)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return l, resp, err
+}
+
+// UnsubscribeFromGroupLabel 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/group_labels.html#unsubscribe-from-a-group-label
+func (s *GroupLabelsService) UnsubscribeFromGroupLabel(gid interface{}, labelID interface{}, options ...OptionFunc) (*Response, error) {
+	group, err := parseID(gid)
+	if err != nil {
+		return nil, err
+	}
+	label, err := parseID(labelID)
+	if err != nil {
+		return nil, err
+	}
+	u := fmt.Sprintf("groups/%s/labels/%s/unsubscribe", url.QueryEscape(group), label)
+
+	req, err := s.client.NewRequest("POST", u, nil, options)
+	if err != nil {
+		return nil, err
+	}
+
+	return s.client.Do(req, nil)
+}