wip

smtp/server.go

@@ -0,0 +1,50 @@
+package smtp
+
+import (
+	"log"
+	"os"
+	"time"
+
+	"github.com/emersion/go-smtp"
+	"maunium.net/go/mautrix/id"
+)
+
+type backend struct {
+	domain string
+	rooms  map[string]id.RoomID
+}
+
+func (b *backend) newSession() *session {
+	return &session{
+		domain: b.domain,
+		rooms:  b.rooms,
+	}
+}
+
+func (b *backend) Login(state *smtp.ConnectionState, username, password string) (smtp.Session, error) {
+	return nil, smtp.ErrAuthUnsupported
+}
+
+func (b *backend) AnonymousLogin(state *smtp.ConnectionState) (smtp.Session, error) {
+	return b.newSession(), nil
+}
+
+func NewServer(domain string, mapping map[string]id.RoomID, port string) *smtp.Server {
+	be := &backend{
+		domain: domain,
+		rooms:  mapping,
+	}
+	s := smtp.NewServer(be)
+	s.Addr = ":" + port
+	s.Domain = domain
+	s.AuthDisabled = true
+	s.ReadTimeout = 360 * time.Second
+	s.WriteTimeout = 360 * time.Second
+	s.MaxMessageBytes = 63 * 1024
+	s.MaxRecipients = 50
+	s.Debug = os.Stdout
+
+	log.Println("Starting SMTP server")
+	log.Fatal(s.ListenAndServe())
+	return s
+}

smtp/session.go

@@ -0,0 +1,47 @@
+package smtp
+
+import (
+	"io"
+	"log"
+
+	"github.com/emersion/go-smtp"
+	"maunium.net/go/mautrix/id"
+)
+
+type session struct {
+	domain string
+	rooms  map[string]id.RoomID
+}
+
+func (s *session) Mail(from string, opts smtp.MailOptions) error {
+	log.Println("mail from", from)
+	return nil
+}
+
+func (s *session) Rcpt(to string) error {
+	_, ok := s.rooms[to]
+	if !ok {
+		return smtp.ErrAuthRequired
+	}
+
+	if Domain(to) != s.domain {
+		return smtp.ErrAuthRequired
+	}
+	log.Println("rcpt to", to)
+	return nil
+}
+
+func (s *session) Data(r io.Reader) error {
+	b, err := io.ReadAll(r)
+	if err != nil {
+		return err
+	}
+	log.Println("Data", string(b))
+	return nil
+}
+
+func (s *session) Reset() {}
+
+func (s *session) Logout() error {
+	return nil
+}

smtp/utils.go

@@ -0,0 +1,7 @@
+package smtp
+
+import "strings"
+
+func Domain(email string) string {
+	return email[strings.LastIndex(email, "@")+1:]
+}