publish: Try to decode ntfy error string

main.go

@@ -58,6 +58,10 @@ type notification struct {
 	status       string
 }
 
+type ntfyError struct {
+	Error string `json:"error"`
+}
+
 func (br *bridge) singleAlertNotifications(p *payload) []*notification {
 	var notifications []*notification
 	for _, alert := range p.Alerts {
@@ -321,9 +325,15 @@ func (br *bridge) publish(n *notification) error {
 
 	defer resp.Body.Close()
 	if resp.StatusCode != http.StatusOK {
+		var ntfyError ntfyError
+		if err := json.NewDecoder(resp.Body).Decode(&ntfyError); err != nil {
+			br.logger.Debugf("Publish: failed to decode error: %v", err)
 			return fmt.Errorf("ntfy: received status code %d", resp.StatusCode)
 		}
 
+		return fmt.Errorf("ntfy: %s (status code %d)", ntfyError.Error, resp.StatusCode)
+	}
+
 	return nil
 }