Read topic from config

config.go

@@ -1,10 +1,15 @@
 package main
 
-import "git.sr.ht/~emersion/go-scfg"
+import (
+	"fmt"
+
+	"git.sr.ht/~emersion/go-scfg"
+)
 
 type config struct {
 	HTTPAddress string
 	LogLevel    string
+	Topic       string
 }
 
 func readConfig(path string) (*config, error) {
@@ -32,5 +37,13 @@ func readConfig(path string) (*config, error) {
 		}
 	}
 
+	d = cfg.Get("topic")
+	if d == nil {
+		return nil, fmt.Errorf("%q missing from config", "topic")
+	}
+	if err := d.ParseParams(&config.Topic); err != nil {
+		return nil, err
+	}
+
 	return config, nil
 }

main.go

@@ -83,8 +83,7 @@ func (rcv *receiver) handleWebhooks(w http.ResponseWriter, r *http.Request) {
 	}
 
 	client := &http.Client{Timeout: time.Second * 3}
-	url := "https://ntfy.sh/alertmanager_test"
+	req, err := http.NewRequest(http.MethodPost, rcv.cfg.Topic, strings.NewReader(body))
-	req, err := http.NewRequest(http.MethodPost, url, strings.NewReader(body))
 	if err != nil {
 		rcv.logger.Error(err)
 	}