forked from Silverfish/proton-bridge
0f125196a6
There was a race condition internal to the go-smtp library. In order to fix it, a version bump was necessary. However, this significantly changed the library interface.
100 lines
2.2 KiB
Go
100 lines
2.2 KiB
Go
// Copyright (c) 2022 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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"fmt"
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"io"
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"github.com/ProtonMail/proton-bridge/v2/internal/user"
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"github.com/emersion/go-smtp"
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)
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type smtpBackend struct {
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bridge *Bridge
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}
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type smtpSession struct {
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bridge *Bridge
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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{
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bridge: be.bridge,
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}, nil
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}
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func (s *smtpSession) AuthPlain(username, password string) error {
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return s.bridge.users.ValuesErr(func(users []*user.User) error {
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for _, user := range users {
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addrID, err := user.CheckAuth(username, []byte(password))
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if err != nil {
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continue
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}
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s.userID = user.ID()
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s.authID = addrID
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return nil
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}
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return fmt.Errorf("invalid username or password")
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})
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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, opts *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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if ok, err := s.bridge.users.GetErr(s.userID, func(user *user.User) error {
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return user.SendMail(s.authID, s.from, s.to, r)
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}); !ok {
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return fmt.Errorf("no such user %q", s.userID)
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} else if err != nil {
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return fmt.Errorf("failed to send mail: %w", err)
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}
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return nil
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}
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