2 files changed, 13 insertions(+), 4 deletions(-)

M config.scfg
M main.go

@@ 69,6 69,8 @@ ntfy {
     server https://ntfy.sh
     # Name of the ntfy topic. For backwards compatibility you can specify the full URL of the
     # topic (e.g. https://ntfy.sh/alertmanager-alerts) and the server will be parsed from it.
+    # Furthermore the topic name can be optionally set by using URL parameters with the webhook
+    # endpoint: https://ntfy-alertmanager.example.com/?topic=foobar
     # This setting is required.
     # Default: ""
     topic alertmanager-alerts

@@ 304,8 304,13 @@ func (br *bridge) multiAlertNotification(p *payload) *notification {
 	return n
 }
 
-func (br *bridge) publish(n *notification) error {
-	url, err := br.topicURL(n.topic)
+func (br *bridge) publish(n *notification, topicParam string) error {
+	// precedence: topicParam > n.topic > cfg.Ntfy.Topic
+	if topicParam == "" {
+		topicParam = n.topic
+	}
+
+	url, err := br.topicURL(topicParam)
 	if err != nil {
 		return err
 	}


@@ 437,6 442,8 @@ func (br *bridge) handleWebhooks(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	topicParam := r.URL.Query().Get("topic")
+
 	var event payload
 	if err := json.NewDecoder(r.Body).Decode(&event); err != nil {
 		http.Error(w, "Failed to parse payload", http.StatusInternalServerError)


@@ 451,7 458,7 @@ func (br *bridge) handleWebhooks(w http.ResponseWriter, r *http.Request) {
 	if br.cfg.AlertMode == config.Single {
 		notifications := br.singleAlertNotifications(&event)
 		for _, n := range notifications {
-			err := br.publish(n)
+			err := br.publish(n, topicParam)
 			if err != nil {
 				logger.Error("Failed to publish notification",
 					slog.String("error", err.Error()))


@@ 465,7 472,7 @@ func (br *bridge) handleWebhooks(w http.ResponseWriter, r *http.Request) {
 		}
 	} else {
 		notification := br.multiAlertNotification(&event)
-		err := br.publish(notification)
+		err := br.publish(notification, topicParam)
 		if err != nil {
 			logger.Error("Failed to publish notification",
 				slog.String("error", err.Error()))