Send reply mail from the post event bus (#16)

Stacks on #15. Handlers only persist and publish; a mail subscriber sends reply email. Unset Resend stays a no-op.

Reviewed-on: #16
Co-authored-by: codegirl-007 <s.raide@gmail.com>

cmd/server/main.go

@@ -37,6 +37,7 @@ func main() {
 		log.Fatalf("mail: %v", err)
 	}
 	bus := events.New()
+	mail.Subscribe(bus, store.NewPostgres(db), notifier)
 	bot, err := discord.FromEnv(store.NewDiscordLinks(db), bus, store.NewPostgres(db), notifier)
 	if err != nil {
 		log.Fatalf("discord: %v", err)
@@ -44,7 +45,7 @@ func main() {
 	if bot != nil {
 		defer bot.Close()
 	}
-	handler := newHandler(db, sessions, uploader, notifier, bus)
+	handler := newHandler(db, sessions, uploader, bus)
 	run(&http.Server{
 		Addr:              listenAddr(),
 		Handler:           handler,
@@ -68,13 +69,12 @@ func openDB() (*sql.DB, *store.SessionStore) {
 	return db, sessions
 }
 
-func newHandler(db *sql.DB, sessions *store.SessionStore, uploader blob.Uploader, notifier mail.Notifier, bus events.Publisher) http.Handler {
+func newHandler(db *sql.DB, sessions *store.SessionStore, uploader blob.Uploader, bus events.Publisher) http.Handler {
 	srv, err := web.New(store.NewPostgres(db), sessions.Store(), plumber.TemplateFS, plumber.StaticFS, web.Config{
 		AdminSetupSecret: strings.TrimSpace(os.Getenv("ADMIN_SETUP_SECRET")),
 		SecureCookie:     secureCookieFromEnv(),
 		TrustedProxies:   parseTrustedProxies(os.Getenv("TRUSTED_PROXY_CIDRS")),
 		Blob:             uploader,
-		Mail:             notifier,
 		Events:           bus,
 		BaseURL:          strings.TrimRight(strings.TrimSpace(os.Getenv("APP_BASE_URL")), "/"),
 	})