Function decodedAPIError

cmd/cmd.go:84–129

decodedAPIError decodes and returns the error message from the API response. If the message is blank, it returns a fallback message with the status code.

(resp *http.Response)

// decodedAPIError decodes and returns the error message from the API response.
// If the message is blank, it returns a fallback message with the status code.
func decodedAPIError(resp *http.Response) error {
	// First and foremost, handle Retry-After headers; if set, show this to the user.
	if retryAfter := resp.Header.Get("Retry-After"); retryAfter != "" {
		// The Retry-After header can be an HTTP Date or delay seconds.
		// The date can be used as-is. The delay seconds should have "seconds" appended.
		if delay, err := strconv.Atoi(retryAfter); err == nil {
			retryAfter = fmt.Sprintf("%d seconds", delay)
		}
		return fmt.Errorf(
			"request failed with status %s; please try again after %s",
			resp.Status,
			retryAfter,
		)
	}

	// Check for JSON data. On non-JSON data, show the status and content type then bail.
	// Otherwise, extract the message details from the JSON.
	if contentType := resp.Header.Get("Content-Type"); !jsonContentTypeRe.MatchString(contentType) {
		return fmt.Errorf(
			"expected response with Content-Type \"application/json\" but got status %q with Content-Type %q",
			resp.Status,
			contentType,
		)
	}
	var apiError struct {
		Error struct {
			Type             string   `json:"type"`
			Message          string   `json:"message"`
			PossibleTrackIDs []string `json:"possible_track_ids"`
		} `json:"error,omitempty"`
	}
	if err := json.NewDecoder(resp.Body).Decode(&apiError); err != nil {
		return fmt.Errorf("failed to parse API error response: %s", err)
	}
	if apiError.Error.Message != "" {
		if apiError.Error.Type == "track_ambiguous" {
			return fmt.Errorf(
				"%s: %s",
				apiError.Error.Message,
				strings.Join(apiError.Error.PossibleTrackIDs, ", "),
			)
		}
		return errors.New(apiError.Error.Message)
	}
	return fmt.Errorf("unexpected API response: %d", resp.StatusCode)
}