// AssignOwner method assigns the specified user as the owner of the alert at OpsGenie.
func (cli *OpsGenieAlertClient) AssignOwner(req alerts.AssignOwnerAlertRequest) (*alerts.AssignOwnerAlertResponse, error) {
	req.APIKey = cli.apiKey
	resp, err := cli.sendRequest(cli.buildPostRequest(assignOwnershipAlertURL, req))

	if resp == nil {
		return nil, err
	}
	defer resp.Body.Close()

	var assignOwnerAlertResp alerts.AssignOwnerAlertResponse

	if err = resp.Body.FromJsonTo(&assignOwnerAlertResp); err != nil {
		message := "Server response can not be parsed, " + err.Error()
		logging.Logger().Warn(message)
		return nil, errors.New(message)
	}
	return &assignOwnerAlertResp, nil
}