237 lines
6.2 KiB
Go
237 lines
6.2 KiB
Go
// Copyright (c) 2020 Proton Technologies AG
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//
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// This file is part of ProtonMail Bridge.
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//
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// ProtonMail 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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// ProtonMail 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 ProtonMail Bridge. If not, see <https://www.gnu.org/licenses/>.
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package transfer
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import (
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"net"
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"time"
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imapID "github.com/ProtonMail/go-imap-id"
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"github.com/ProtonMail/proton-bridge/pkg/pmapi"
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"github.com/emersion/go-imap"
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imapClient "github.com/emersion/go-imap/client"
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sasl "github.com/emersion/go-sasl"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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)
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const (
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imapDialTimeout = 5 * time.Second
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imapRetries = 10
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imapReconnectTimeout = 30 * time.Minute
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imapReconnectSleep = time.Minute
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)
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type imapErrorLogger struct {
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log *logrus.Entry
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}
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func (l *imapErrorLogger) Printf(f string, v ...interface{}) {
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l.log.Errorf(f, v...)
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}
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func (l *imapErrorLogger) Println(v ...interface{}) {
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l.log.Errorln(v...)
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}
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type imapDebugLogger struct { //nolint[unused]
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log *logrus.Entry
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}
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func (l *imapDebugLogger) Write(data []byte) (int, error) {
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l.log.Trace(string(data))
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return len(data), nil
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}
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func (p *IMAPProvider) ensureConnection(callback func() error) error {
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var callErr error
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for i := 1; i <= imapRetries; i++ {
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callErr = callback()
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if callErr == nil {
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return nil
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}
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log.WithField("attempt", i).WithError(callErr).Warning("Call failed, trying reconnect")
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err := p.tryReconnect()
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if err != nil {
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return err
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}
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}
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return errors.Wrap(callErr, "too many retries")
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}
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func (p *IMAPProvider) tryReconnect() error {
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start := time.Now()
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var previousErr error
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for {
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if time.Since(start) > imapReconnectTimeout {
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return previousErr
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}
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err := pmapi.CheckConnection()
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if err != nil {
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time.Sleep(imapReconnectSleep)
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previousErr = err
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continue
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}
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err = p.reauth()
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if err != nil {
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time.Sleep(imapReconnectSleep)
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previousErr = err
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continue
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}
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break
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}
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return nil
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}
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func (p *IMAPProvider) reauth() error {
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if _, err := p.client.Capability(); err != nil {
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state := p.client.State()
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log.WithField("addr", p.addr).WithField("state", state).WithError(err).Debug("Reconnecting")
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p.client = nil
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}
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return p.auth()
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}
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func (p *IMAPProvider) auth() error { //nolint[funlen]
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log := log.WithField("addr", p.addr)
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log.Info("Connecting to server")
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if _, err := net.DialTimeout("tcp", p.addr, imapDialTimeout); err != nil {
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return errors.Wrap(err, "failed to dial server")
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}
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client, err := imapClient.DialTLS(p.addr, nil)
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if err != nil {
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return errors.Wrap(err, "failed to connect to server")
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}
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client.ErrorLog = &imapErrorLogger{logrus.WithField("pkg", "imap-client")}
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// Logrus have Writer helper but it fails for big messages because of
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// bufio.MaxScanTokenSize limit.
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// This spams a lot, uncomment once needed during development.
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//client.SetDebug(&imapDebugLogger{logrus.WithField("pkg", "imap-client")})
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p.client = client
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log.Info("Connected")
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if (p.client.State() & imap.AuthenticatedState) == imap.AuthenticatedState {
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return nil
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}
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capability, err := p.client.Capability()
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log.WithField("capability", capability).WithError(err).Debug("Server capability")
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if err != nil {
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return errors.Wrap(err, "failed to get capabilities")
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}
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// SASL AUTH PLAIN
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if ok, _ := p.client.SupportAuth("PLAIN"); p.client.State() == imap.NotAuthenticatedState && ok {
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log.Debug("Trying plain auth")
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authPlain := sasl.NewPlainClient("", p.username, p.password)
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if err = p.client.Authenticate(authPlain); err != nil {
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return errors.Wrap(err, "plain auth failed")
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}
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}
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// LOGIN: if the server reports the IMAP4rev1 capability then it is standards conformant and must support login.
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if ok, _ := p.client.Support("IMAP4rev1"); p.client.State() == imap.NotAuthenticatedState && ok {
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log.Debug("Trying login")
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if err = p.client.Login(p.username, p.password); err != nil {
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return errors.Wrap(err, "login failed")
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}
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}
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if p.client.State() == imap.NotAuthenticatedState {
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return errors.New("unknown auth method")
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}
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log.Info("Logged in")
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idClient := imapID.NewClient(p.client)
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if ok, err := idClient.SupportID(); err == nil && ok {
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serverID, err := idClient.ID(imapID.ID{
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imapID.FieldName: "ImportExport",
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imapID.FieldVersion: "beta",
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})
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log.WithField("ID", serverID).WithError(err).Debug("Server info")
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}
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return err
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}
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func (p *IMAPProvider) list() (mailboxes []*imap.MailboxInfo, err error) {
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err = p.ensureConnection(func() error {
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mailboxesCh := make(chan *imap.MailboxInfo)
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doneCh := make(chan error)
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go func() {
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doneCh <- p.client.List("", "*", mailboxesCh)
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}()
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for mailbox := range mailboxesCh {
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mailboxes = append(mailboxes, mailbox)
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}
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return <-doneCh
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})
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return
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}
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func (p *IMAPProvider) selectIn(mailboxName string) (mailbox *imap.MailboxStatus, err error) {
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err = p.ensureConnection(func() error {
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mailbox, err = p.client.Select(mailboxName, true)
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return err
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})
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return
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}
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func (p *IMAPProvider) fetch(seqSet *imap.SeqSet, items []imap.FetchItem, processMessageCallback func(m *imap.Message)) error {
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return p.fetchHelper(false, seqSet, items, processMessageCallback)
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}
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func (p *IMAPProvider) uidFetch(seqSet *imap.SeqSet, items []imap.FetchItem, processMessageCallback func(m *imap.Message)) error {
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return p.fetchHelper(true, seqSet, items, processMessageCallback)
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}
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func (p *IMAPProvider) fetchHelper(uid bool, seqSet *imap.SeqSet, items []imap.FetchItem, processMessageCallback func(m *imap.Message)) error {
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return p.ensureConnection(func() error {
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messagesCh := make(chan *imap.Message)
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doneCh := make(chan error)
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go func() {
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if uid {
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doneCh <- p.client.UidFetch(seqSet, items, messagesCh)
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} else {
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doneCh <- p.client.Fetch(seqSet, items, messagesCh)
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}
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}()
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for message := range messagesCh {
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processMessageCallback(message)
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}
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err := <-doneCh
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return err
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})
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}
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