auto mail generation

main.go

@@ -442,7 +442,28 @@ func main() {
 	// ASSISTANT_AGENTS_DIR replaces the compiled-in agent definitions wholesale.
 	// Empty uses the embedded ones, so a deployment cannot be broken by a missing
 	// directory.
-	f := facade.NewFacade(db.DB, db.CatalogueDB, embedder, chat, os.Getenv("ASSISTANT_AGENTS_DIR"), cfg.Assistant.Why())
+	// Mail, for the invitation a newly onboarded merchant is sent.
+	//
+	// Optional in the same way as the model and the embedder: without it the
+	// server still boots and still onboards tenants, and the create response
+	// says the invitation was not sent and which variable is missing. Refusing
+	// to start would make a mail relay a hard dependency of creating a shop,
+	// which it is not.
+	mailer, err := utils.NewMailer(cfg.Mail)
+	if err != nil {
+		// A configured-but-invalid sender, as opposed to no mail at all. That
+		// fails every message, so it is worth stopping for rather than
+		// discovering one silent invitation at a time.
+		log.Fatal("mail:", err)
+	}
+	if mailer == nil {
+		log.Printf("mail: OFF — %s", cfg.Mail.Why())
+	} else {
+		log.Printf("mail: sending as %s via %s", cfg.Mail.FromAddress, cfg.Mail.Address())
+	}
+
+	f := facade.NewFacade(db.DB, db.CatalogueDB, embedder, chat,
+		os.Getenv("ASSISTANT_AGENTS_DIR"), cfg.Assistant.Why(), mailer, cfg.Mail)
 
 	routes.RegisterRoutes(app, f)