use postmoogle as general purpose SMTP server and allow other apps or scripts to send emails through it

smtp/msa.go

@@ -2,10 +2,13 @@ package smtp
 
 import (
 	"context"
+	"errors"
 
 	"github.com/emersion/go-smtp"
 	"github.com/getsentry/sentry-go"
 	"gitlab.com/etke.cc/go/logger"
+
+	"gitlab.com/etke.cc/postmoogle/utils"
 )
 
 // msa is mail submission agent, implements smtp.Backend
@@ -13,11 +16,15 @@ type msa struct {
 	log    *logger.Logger
 	domain string
 	bot    Bot
+	mta    utils.MTA
 }
 
-func (m *msa) newSession() *msasession {
+func (m *msa) newSession(from string, local bool) *msasession {
 	return &msasession{
 		ctx:    sentry.SetHubOnContext(context.Background(), sentry.CurrentHub().Clone()),
+		mta:    m.mta,
+		from:   from,
+		local:  local,
 		log:    m.log,
 		bot:    m.bot,
 		domain: m.domain,
@@ -25,9 +32,18 @@ func (m *msa) newSession() *msasession {
 }
 
 func (m *msa) Login(state *smtp.ConnectionState, username, password string) (smtp.Session, error) {
-	return nil, smtp.ErrAuthUnsupported
+	if !utils.AddressValid(username) {
+		return nil, errors.New("please, provide email address")
+	}
+
+	mailbox := utils.Mailbox(username)
+	if !m.bot.AllowAuth(mailbox, password) {
+		return nil, errors.New("email or password is invalid")
+	}
+
+	return m.newSession(username, false), nil
 }
 
 func (m *msa) AnonymousLogin(state *smtp.ConnectionState) (smtp.Session, error) {
-	return m.newSession(), nil
+	return m.newSession("", true), nil
 }