Add the beginnings of SMTP session management

internal/smtp/server.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"io"
 	"log"
+	"sync/atomic"
 
 	"github.com/emersion/go-smtp"
 
@@ -27,8 +28,10 @@ func NewServer(cancel context.CancelFunc, datastore store.Interface, submission
 	out.server.TLSConfig = datastore.TLSConfig()
 
 	if submission {
+		out.name = "submission"
 		out.server.Addr = ":587"
 	} else {
+		out.name = "SMTP"
 		out.server.Addr = ":25"
 	}
 
@@ -36,9 +39,13 @@ func NewServer(cancel context.CancelFunc, datastore store.Interface, submission
 }
 
 type concrete struct {
+	name   string
 	cancel context.CancelFunc
 	store  store.Interface
 	server *smtp.Server
+
+	// Session IDs
+	sid uint64
 }
 
 func (c *concrete) Run() {
@@ -52,8 +59,17 @@ func (c *concrete) Run() {
 }
 
 // backend implementation for go-smtp
-func (c *concrete) Login(string, string) (smtp.User, error) {
-	return nil, nil
+func (c *concrete) Login(user, pass string) (smtp.User, error) {
+	// FIXME: TODO: Check for account existence and correct password(!)
+	session := &Session{
+		ID:          atomic.AddUint64(&c.sid, uint64(1)),
+		AccountName: user,
+		ServiceName: c.name,
+	}
+
+	log.Printf("Beginning %s session %d for %s", c.name, session.ID, user)
+
+	return session, nil
 }
 
 func (c *concrete) Close() error {