mirror of
https://github.com/ProtonMail/proton-bridge.git
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110 lines
2.7 KiB
Go
110 lines
2.7 KiB
Go
// Copyright (c) 2023 Proton AG
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//
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// This file is part of Proton Mail Bridge.
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//
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// Proton Mail Bridge is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Proton Mail Bridge is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>.
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package bridge
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import (
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"context"
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"errors"
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"fmt"
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"io"
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"strings"
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"github.com/ProtonMail/proton-bridge/v3/internal/identifier"
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smtpservice "github.com/ProtonMail/proton-bridge/v3/internal/services/smtp"
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"github.com/ProtonMail/proton-bridge/v3/internal/useragent"
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"github.com/emersion/go-smtp"
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"github.com/sirupsen/logrus"
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)
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type smtpBackend struct {
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accounts *smtpservice.Accounts
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userAgent identifier.UserAgentUpdater
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}
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type smtpSession struct {
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accounts *smtpservice.Accounts
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userAgent identifier.UserAgentUpdater
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userID string
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authID string
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from string
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to []string
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}
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func (be *smtpBackend) NewSession(*smtp.Conn) (smtp.Session, error) {
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return &smtpSession{accounts: be.accounts, userAgent: be.userAgent}, nil
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}
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func (s *smtpSession) AuthPlain(username, password string) error {
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userID, authID, err := s.accounts.CheckAuth(username, []byte(password))
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if err != nil {
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if !errors.Is(err, smtpservice.ErrNoSuchUser) {
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return fmt.Errorf("unknown error")
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}
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logrus.WithFields(logrus.Fields{
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"username": username,
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"pkg": "smtp",
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}).Error("Incorrect login credentials.")
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return fmt.Errorf("invalid username or password")
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}
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s.userID = userID
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s.authID = authID
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if strings.Contains(s.userAgent.GetUserAgent(), useragent.DefaultUserAgent) {
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s.userAgent.SetUserAgent(useragent.UnknownClient, useragent.DefaultVersion)
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}
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return nil
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}
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func (s *smtpSession) Reset() {
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s.from = ""
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s.to = nil
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}
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func (s *smtpSession) Logout() error {
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s.Reset()
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return nil
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}
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func (s *smtpSession) Mail(from string, _ *smtp.MailOptions) error {
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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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if len(to) > 0 {
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s.to = append(s.to, to)
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}
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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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err := s.accounts.SendMail(context.Background(), s.userID, s.authID, s.from, s.to, r)
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if err != nil {
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logrus.WithField("pkg", "smtp").WithError(err).Error("Send mail failed.")
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}
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return err
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}
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