109 lines
2.3 KiB
Go
109 lines
2.3 KiB
Go
package server
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import (
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"bytes"
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"errors"
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"github.com/emersion/go-smtp"
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"io"
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"io/ioutil"
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"log"
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"net/mail"
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"strings"
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"sync"
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)
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// smtpBackend implements SMTP server methods.
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type smtpBackend struct {
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config *Config
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sub subscriber
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}
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func newMailBackend(conf *Config, sub subscriber) *smtpBackend {
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return &smtpBackend{
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config: conf,
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sub: sub,
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}
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}
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func (b *smtpBackend) Login(state *smtp.ConnectionState, username, password string) (smtp.Session, error) {
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return &smtpSession{config: b.config, sub: b.sub}, nil
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}
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func (b *smtpBackend) AnonymousLogin(state *smtp.ConnectionState) (smtp.Session, error) {
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return &smtpSession{config: b.config, sub: b.sub}, nil
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}
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// smtpSession is returned after EHLO.
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type smtpSession struct {
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config *Config
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sub subscriber
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from, to string
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mu sync.Mutex
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}
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func (s *smtpSession) AuthPlain(username, password string) error {
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return nil
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}
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func (s *smtpSession) Mail(from string, opts smtp.MailOptions) error {
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s.mu.Lock()
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defer s.mu.Unlock()
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s.from = from
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return nil
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}
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func (s *smtpSession) Rcpt(to string) error {
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s.mu.Lock()
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defer s.mu.Unlock()
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addressList, err := mail.ParseAddressList(to)
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if err != nil {
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return err
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} else if len(addressList) != 1 {
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return errors.New("only one recipient supported")
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} else if !strings.HasSuffix(addressList[0].Address, "@"+s.config.SMTPServerDomain) {
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return errors.New("invalid domain")
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} else if s.config.SMTPServerAddrPrefix != "" && !strings.HasPrefix(addressList[0].Address, s.config.SMTPServerAddrPrefix) {
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return errors.New("invalid address")
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}
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// FIXME check topic format
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s.to = addressList[0].Address
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return nil
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}
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func (s *smtpSession) Data(r io.Reader) error {
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s.mu.Lock()
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defer s.mu.Unlock()
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b, err := ioutil.ReadAll(r)
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if err != nil {
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return err
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}
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log.Println("Data:", string(b))
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msg, err := mail.ReadMessage(bytes.NewReader(b))
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if err != nil {
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return err
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}
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body, err := io.ReadAll(msg.Body)
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if err != nil {
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return err
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}
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topic := strings.TrimSuffix(s.to, "@"+s.config.SMTPServerDomain)
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m := newDefaultMessage(topic, string(body))
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subject := msg.Header.Get("Subject")
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if subject != "" {
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m.Title = subject
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}
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return s.sub(m)
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}
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func (s *smtpSession) Reset() {
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s.mu.Lock()
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s.from = ""
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s.to = ""
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s.mu.Unlock()
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}
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func (s *smtpSession) Logout() error {
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return nil
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}
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