Make listen address configurable

README.md

@@ -17,6 +17,7 @@ Check https://github.com/tmsmr/xmpp-webhook/blob/master/parser/ to learn how to
     - `XMPP_RECEIVERS` - Comma-seperated list of JID's
     - `XMPP_SKIP_VERIFY` - Skip TLS verification (Optional)
     - `XMPP_OVER_TLS` - Use dedicated TLS port (Optional)
+    - `XMPP_WEBHOOK_LISTEN_ADDRESS` - Bind address (Optional)
 - After startup, `xmpp-webhook` tries to connect to the XMPP server and provides the implemented HTTP enpoints (on `:4321`). e.g.:
 
 ```

main.go

@@ -75,6 +75,12 @@ func main() {
 	_, skipTLSVerify := os.LookupEnv("XMPP_SKIP_VERIFY")
 	_, useXMPPS := os.LookupEnv("XMPP_OVER_TLS")
 
+	// get listen address
+	listenAddress := os.Getenv("XMPP_WEBHOOK_LISTEN_ADDRESS")
+	if len(listenAddress) == 0 {
+		listenAddress = ":4321"
+	}
+
 	// check if xmpp credentials and receiver list are supplied
 	if xi == "" || xp == "" || xr == "" {
 		log.Fatal("XMPP_ID, XMPP_PASS or XMPP_RECEIVERS not set")
@@ -157,5 +163,5 @@ func main() {
 	http.Handle("/alertmanager", newMessageHandler(messages, parser.AlertmanagerParserFunc))
 
 	// listen for requests
-	_ = http.ListenAndServe(":4321", nil)
+	_ = http.ListenAndServe(listenAddress, nil)
 }