mirror of
https://github.com/ProtonMail/proton-bridge.git
synced 2025-12-10 12:46:46 +00:00
103 lines
2.8 KiB
Go
103 lines
2.8 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 currentclient implements setting client's ID to backend.
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package currentclient
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import (
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"sync"
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"time"
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imapid "github.com/ProtonMail/go-imap-id"
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imapserver "github.com/emersion/go-imap/server"
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"github.com/sirupsen/logrus"
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)
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var log = logrus.WithField("pkg", "imap/currentclient") //nolint[gochecknoglobals]
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type currentClientSetter interface {
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SetCurrentClient(name, version string)
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}
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type extension struct {
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backend currentClientSetter
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lastID imapid.ID
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lastIDLocker sync.Locker
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}
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// NewExtension prepares extension reading IMAP ID from connection
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// and setting it to backend. This is not standard IMAP extension.
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func NewExtension(backend currentClientSetter) imapserver.Extension {
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return &extension{
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backend: backend,
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lastID: imapid.ID{imapid.FieldName: ""},
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lastIDLocker: &sync.Mutex{},
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}
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}
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func (ext *extension) Capabilities(conn imapserver.Conn) []string {
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ext.readID(conn)
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return nil
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}
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func (ext *extension) Command(name string) imapserver.HandlerFactory {
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return nil
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}
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func (ext *extension) readID(conn imapserver.Conn) {
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conn.Server().ForEachConn(func(candidate imapserver.Conn) {
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if id, ok := candidate.(imapid.Conn); ok {
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if conn.Context() == candidate.Context() {
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// ID is not available right at the beginning of the connection.
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// Clients send ID quickly after AUTH. We need to wait for it.
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go func() {
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start := time.Now()
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for {
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if id.ID() != nil {
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ext.setLastID(id.ID())
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break
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}
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if time.Since(start) > 10*time.Second {
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break
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}
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time.Sleep(100 * time.Millisecond)
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}
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}()
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}
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}
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})
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}
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func (ext *extension) setLastID(id imapid.ID) {
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ext.lastIDLocker.Lock()
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defer ext.lastIDLocker.Unlock()
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if name, ok := id[imapid.FieldName]; ok && ext.lastID[imapid.FieldName] != name {
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ext.lastID = imapid.ID{}
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for k, v := range id {
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ext.lastID[k] = v
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}
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log.Warn("Mail Client ID changed to ", ext.lastID)
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ext.backend.SetCurrentClient(
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ext.lastID[imapid.FieldName],
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ext.lastID[imapid.FieldVersion],
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)
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}
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}
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