when initializing slack, stash token in driver

main.go

@@ -196,24 +196,33 @@ func basicAuth(cfg Config, w http.ResponseWriter, r *http.Request) bool {
 
 func newHandlerPostAPIV1EventsSlack(cfg Config) http.HandlerFunc {
 	if cfg.InitializeSlack {
-		return handlerPostAPIV1EventsSlackInitialize
+		return handlerPostAPIV1EventsSlackInitialize(cfg)
 	}
 	return _newHandlerPostAPIV1EventsSlack(cfg)
 }
 
-func handlerPostAPIV1EventsSlackInitialize(w http.ResponseWriter, r *http.Request) {
-	b, _ := io.ReadAll(r.Body)
-	var challenge struct {
-		Token     string
-		Challenge string
-		Type      string
+func handlerPostAPIV1EventsSlackInitialize(cfg Config) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		b, _ := io.ReadAll(r.Body)
+		var challenge struct {
+			Token     string
+			Challenge string
+			Type      string
+		}
+		if err := json.Unmarshal(b, &challenge); err != nil {
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+		if _, err := cfg.driver.ExecContext(r.Context(), `
+			CREATE TABLE IF NOT EXISTS initialization (label TEXT, token TEXT, updated TIMESTAMP);
+			INSERT INTO initialization (token, updated) VALUES ('slack_events_webhook_token', $1, $2);
+		`, challenge.Token, time.Now().UTC()); err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+		log.Println("stashed new slack initialization token")
+		encodeResponse(w, r, map[string]any{"challenge": challenge.Challenge})
 	}
-	if err := json.Unmarshal(b, &challenge); err != nil {
-		http.Error(w, err.Error(), http.StatusBadRequest)
-		return
-	}
-
-	encodeResponse(w, r, map[string]any{"challenge": challenge.Challenge})
 }
 
 func _newHandlerPostAPIV1EventsSlack(cfg Config) http.HandlerFunc {