func (a *API) FetchContactGroup(cid CIDType) (*ContactGroup, error) {
	if cid == nil || *cid == "" {
		return nil, fmt.Errorf("Invalid contact group CID [none]")
	}

	groupCID := string(*cid)

	matched, err := regexp.MatchString(config.ContactGroupCIDRegex, groupCID)
	if err != nil {
		return nil, err
	}
	if !matched {
		return nil, fmt.Errorf("Invalid contact group CID [%s]", groupCID)
	}

	result, err := a.Get(groupCID)
	if err != nil {
		return nil, err
	}

	if a.Debug {
		a.Log.Printf("[DEBUG] fetch contact group, received JSON: %s", string(result))
	}

	group := new(ContactGroup)
	if err := json.Unmarshal(result, group); err != nil {
		return nil, err
	}

	return group, nil
}
func (a *API) FetchContactGroup(cid CIDType) (*ContactGroup, error) {
	if cid == nil || *cid == "" {
		return nil, fmt.Errorf("Invalid contact group CID [none]")
	}

	groupCID := string(*cid)

	matched, err := regexp.MatchString(config.ContactGroupCIDRegex, groupCID)
	if err != nil {
		return nil, err
	}
	if !matched {
		return nil, fmt.Errorf("Invalid contact group CID [%s]", groupCID)
	}

	result, err := a.Get(groupCID)
	if err != nil {
		return nil, err
	}

	if a.Debug {
		a.Log.Printf("[DEBUG] fetch contact group, received JSON: %s", string(result))
	}

	group := new(ContactGroup)
	if err := json.Unmarshal(result, group); err != nil {
		return nil, err
	}

	return group, nil
}
// FetchContactGroup retrieves contact group with passed cid.