func (a *API) FetchWorksheet(cid CIDType) (*Worksheet, error) {
	if cid == nil || *cid == "" {
		return nil, fmt.Errorf("Invalid worksheet CID [none]")
	}

	worksheetCID := string(*cid)

	matched, err := regexp.MatchString(config.WorksheetCIDRegex, worksheetCID)
	if err != nil {
		return nil, err
	}
	if !matched {
		return nil, fmt.Errorf("Invalid worksheet CID [%s]", worksheetCID)
	}

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

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

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

	return worksheet, nil
}
func (a *API) FetchWorksheet(cid CIDType) (*Worksheet, error) {
	if cid == nil || *cid == "" {
		return nil, fmt.Errorf("Invalid worksheet CID [none]")
	}

	worksheetCID := string(*cid)

	matched, err := regexp.MatchString(config.WorksheetCIDRegex, worksheetCID)
	if err != nil {
		return nil, err
	}
	if !matched {
		return nil, fmt.Errorf("Invalid worksheet CID [%s]", worksheetCID)
	}

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

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

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

	return worksheet, nil
}
// FetchWorksheet retrieves worksheet with passed cid.