Get receiving email a step closer with a modified go-smtp

internal/smtp/server.go

@@ -31,7 +31,7 @@ func NewServer(cancel context.CancelFunc, datastore store.Interface, submission
 	if submission {
 		out.handler = &Sender{}
 		out.server.Addr = ":587"
-		out.allowLogin = true // Only allow login on submission ports
+		out.submission = true // Only allow login on submission ports
 	} else {
 		out.handler = &Receiver{}
 		out.server.Addr = ":25"
@@ -46,7 +46,7 @@ type concrete struct {
 	store      store.Interface
 	server     *smtp.Server
 	handler    Handler
-	allowLogin bool
+	submission bool
 
 	// Session IDs
 	sid uint64
@@ -64,7 +64,7 @@ func (c *concrete) Run() {
 
 // backend implementation for go-smtp
 func (c *concrete) Login(user, pass string) (smtp.User, error) {
-	if !c.allowLogin {
+	if !c.submission {
 		return nil, fmt.Errorf("Login is disabled")
 	}
 
@@ -87,6 +87,23 @@ func (c *concrete) Login(user, pass string) (smtp.User, error) {
 	return session, nil
 }
 
+func (c *concrete) AnonymousLogin() (smtp.User, error) {
+	if c.submission {
+		return nil, smtp.AuthRequiredErr
+	}
+
+	session := &Session{
+		ID:      atomic.AddUint64(&c.sid, uint64(1)),
+		Account: nil,
+		Handler: c.handler,
+	}
+
+	log.Printf("Beginning anonymous %s session %d", c.name, session.ID)
+	// FIXME: TODO: Track ongoing sessions for termination or notifications
+
+	return session, nil
+}
+
 func (c *concrete) Close() error {
 	c.cancel() // FIXME: this doesn't touch the server