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package backendutil
import (
"io"
"github.com/emersion/go-sasl"
"github.com/emersion/go-smtp"
)
// TransformBackend is a backend that transforms messages.
type TransformBackend struct {
Backend smtp.Backend
TransformMail func(from string) (string, error)
TransformRcpt func(to string) (string, error)
TransformData func(r io.Reader) (io.Reader, error)
}
func (be *TransformBackend) NewSession(c *smtp.Conn) (smtp.Session, error) {
sess, err := be.Backend.NewSession(c)
if err != nil {
return nil, err
}
return &transformSession{Session: sess, be: be}, nil
}
type transformSession struct {
Session smtp.Session
be *TransformBackend
}
func (s *transformSession) Reset() {
s.Session.Reset()
}
func (s *transformSession) AuthMechanisms() []string {
if authSession, ok := s.Session.(smtp.AuthSession); ok {
return authSession.AuthMechanisms()
}
return nil
}
func (s *transformSession) Auth(mech string) (sasl.Server, error) {
if authSession, ok := s.Session.(smtp.AuthSession); ok {
return authSession.Auth(mech)
}
return nil, smtp.ErrAuthUnsupported
}
func (s *transformSession) Mail(from string, opts *smtp.MailOptions) error {
if s.be.TransformMail != nil {
var err error
from, err = s.be.TransformMail(from)
if err != nil {
return err
}
}
return s.Session.Mail(from, opts)
}
func (s *transformSession) Rcpt(to string, opts *smtp.RcptOptions) error {
if s.be.TransformRcpt != nil {
var err error
to, err = s.be.TransformRcpt(to)
if err != nil {
return err
}
}
return s.Session.Rcpt(to, opts)
}
func (s *transformSession) Data(r io.Reader) error {
if s.be.TransformData != nil {
var err error
r, err = s.be.TransformData(r)
if err != nil {
return err
}
}
return s.Session.Data(r)
}
func (s *transformSession) Logout() error {
return s.Session.Logout()
}
|
