623 lines
18 KiB
Go
623 lines
18 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 user
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import (
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"bytes"
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"context"
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"fmt"
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"net/mail"
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"sync/atomic"
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"time"
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"github.com/ProtonMail/gluon/connector"
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"github.com/ProtonMail/gluon/imap"
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"github.com/ProtonMail/gluon/rfc822"
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"github.com/ProtonMail/go-proton-api"
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"github.com/ProtonMail/gopenpgp/v2/crypto"
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"github.com/ProtonMail/proton-bridge/v3/internal/safe"
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"github.com/ProtonMail/proton-bridge/v3/internal/vault"
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"github.com/ProtonMail/proton-bridge/v3/pkg/message"
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"github.com/ProtonMail/proton-bridge/v3/pkg/message/parser"
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"github.com/bradenaw/juniper/stream"
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"github.com/bradenaw/juniper/xslices"
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"golang.org/x/exp/slices"
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)
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// Verify that *imapConnector implements connector.Connector.
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var _ connector.Connector = (*imapConnector)(nil)
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var (
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defaultFlags = imap.NewFlagSet(imap.FlagSeen, imap.FlagFlagged, imap.FlagDeleted) // nolint:gochecknoglobals
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defaultPermanentFlags = imap.NewFlagSet(imap.FlagSeen, imap.FlagFlagged, imap.FlagDeleted) // nolint:gochecknoglobals
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defaultAttributes = imap.NewFlagSet() // nolint:gochecknoglobals
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)
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const (
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folderPrefix = "Folders"
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labelPrefix = "Labels"
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)
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type imapConnector struct {
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*User
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addrID string
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flags, permFlags, attrs imap.FlagSet
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}
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func newIMAPConnector(user *User, addrID string) *imapConnector {
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return &imapConnector{
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User: user,
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addrID: addrID,
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flags: defaultFlags,
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permFlags: defaultPermanentFlags,
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attrs: defaultAttributes,
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}
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}
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// Authorize returns whether the given username/password combination are valid for this connector.
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func (conn *imapConnector) Authorize(username string, password []byte) bool {
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addrID, err := conn.CheckAuth(username, password)
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if err != nil {
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return false
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}
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if conn.vault.AddressMode() == vault.SplitMode && addrID != conn.addrID {
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return false
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}
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return true
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}
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// CreateMailbox creates a label with the given name.
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func (conn *imapConnector) CreateMailbox(ctx context.Context, name []string) (imap.Mailbox, error) {
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defer conn.goPollAPIEvents(false)
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if len(name) < 2 {
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return imap.Mailbox{}, fmt.Errorf("invalid mailbox name %q", name)
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}
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switch name[0] {
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case folderPrefix:
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return conn.createFolder(ctx, name[1:])
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case labelPrefix:
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return conn.createLabel(ctx, name[1:])
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default:
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return imap.Mailbox{}, fmt.Errorf("invalid mailbox name %q", name)
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}
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}
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func (conn *imapConnector) createLabel(ctx context.Context, name []string) (imap.Mailbox, error) {
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if len(name) != 1 {
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return imap.Mailbox{}, fmt.Errorf("a label cannot have children")
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}
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return safe.LockRetErr(func() (imap.Mailbox, error) {
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label, err := conn.client.CreateLabel(ctx, proton.CreateLabelReq{
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Name: name[0],
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Color: "#f66",
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Type: proton.LabelTypeLabel,
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})
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if err != nil {
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return imap.Mailbox{}, err
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}
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conn.apiLabels[label.ID] = label
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return toIMAPMailbox(label, conn.flags, conn.permFlags, conn.attrs), nil
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}, conn.apiLabelsLock)
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}
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func (conn *imapConnector) createFolder(ctx context.Context, name []string) (imap.Mailbox, error) {
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return safe.LockRetErr(func() (imap.Mailbox, error) {
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var parentID string
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if len(name) > 1 {
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for _, label := range conn.apiLabels {
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if !slices.Equal(label.Path, name[:len(name)-1]) {
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continue
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}
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parentID = label.ID
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break
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}
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if parentID == "" {
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return imap.Mailbox{}, fmt.Errorf("parent folder %q does not exist", name[:len(name)-1])
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}
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}
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label, err := conn.client.CreateLabel(ctx, proton.CreateLabelReq{
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Name: name[len(name)-1],
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Color: "#f66",
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Type: proton.LabelTypeFolder,
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ParentID: parentID,
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})
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if err != nil {
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return imap.Mailbox{}, err
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}
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// Add label to list so subsequent sub folder create requests work correct.
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conn.apiLabels[label.ID] = label
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return toIMAPMailbox(label, conn.flags, conn.permFlags, conn.attrs), nil
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}, conn.apiLabelsLock)
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}
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// UpdateMailboxName sets the name of the label with the given ID.
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func (conn *imapConnector) UpdateMailboxName(ctx context.Context, labelID imap.MailboxID, name []string) error {
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defer conn.goPollAPIEvents(false)
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if len(name) < 2 {
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return fmt.Errorf("invalid mailbox name %q", name)
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}
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switch name[0] {
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case folderPrefix:
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return conn.updateFolder(ctx, labelID, name[1:])
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case labelPrefix:
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return conn.updateLabel(ctx, labelID, name[1:])
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default:
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return fmt.Errorf("invalid mailbox name %q", name)
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}
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}
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func (conn *imapConnector) updateLabel(ctx context.Context, labelID imap.MailboxID, name []string) error {
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if len(name) != 1 {
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return fmt.Errorf("a label cannot have children")
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}
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label, err := conn.client.GetLabel(ctx, string(labelID), proton.LabelTypeLabel)
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if err != nil {
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return err
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}
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if _, err := conn.client.UpdateLabel(ctx, label.ID, proton.UpdateLabelReq{
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Name: name[0],
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Color: label.Color,
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}); err != nil {
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return err
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}
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return nil
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}
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func (conn *imapConnector) updateFolder(ctx context.Context, labelID imap.MailboxID, name []string) error {
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return safe.RLockRet(func() error {
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var parentID string
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if len(name) > 1 {
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for _, label := range conn.apiLabels {
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if !slices.Equal(label.Path, name[:len(name)-1]) {
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continue
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}
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parentID = label.ID
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break
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}
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if parentID == "" {
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return fmt.Errorf("parent folder %q does not exist", name[:len(name)-1])
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}
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}
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label, err := conn.client.GetLabel(ctx, string(labelID), proton.LabelTypeFolder)
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if err != nil {
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return err
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}
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if _, err := conn.client.UpdateLabel(ctx, string(labelID), proton.UpdateLabelReq{
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Name: name[len(name)-1],
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Color: label.Color,
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ParentID: parentID,
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}); err != nil {
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return err
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}
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return nil
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}, conn.apiLabelsLock)
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}
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// DeleteMailbox deletes the label with the given ID.
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func (conn *imapConnector) DeleteMailbox(ctx context.Context, labelID imap.MailboxID) error {
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defer conn.goPollAPIEvents(false)
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return conn.client.DeleteLabel(ctx, string(labelID))
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}
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// CreateMessage creates a new message on the remote.
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//
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// nolint:funlen
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func (conn *imapConnector) CreateMessage(
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ctx context.Context,
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mailboxID imap.MailboxID,
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literal []byte,
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flags imap.FlagSet,
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date time.Time,
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) (imap.Message, []byte, error) {
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defer conn.goPollAPIEvents(false)
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// Compute the hash of the message (to match it against SMTP messages).
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hash, err := getMessageHash(literal)
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if err != nil {
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return imap.Message{}, nil, err
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}
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// Check if we already tried to send this message recently.
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if messageID, ok, err := conn.sendHash.hasEntryWait(ctx, hash, time.Now().Add(90*time.Second)); err != nil {
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return imap.Message{}, nil, fmt.Errorf("failed to check send hash: %w", err)
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} else if ok {
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conn.log.WithField("messageID", messageID).Warn("Message already sent")
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message, err := conn.client.GetMessage(ctx, messageID)
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if err != nil {
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return imap.Message{}, nil, fmt.Errorf("failed to fetch message: %w", err)
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}
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return toIMAPMessage(message.MessageMetadata), nil, nil
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}
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wantLabelIDs := []string{string(mailboxID)}
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if flags.Contains(imap.FlagFlagged) {
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wantLabelIDs = append(wantLabelIDs, proton.StarredLabel)
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}
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var wantFlags proton.MessageFlag
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unread := !flags.Contains(imap.FlagSeen)
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if mailboxID != proton.DraftsLabel {
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header, err := rfc822.Parse(literal).ParseHeader()
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if err != nil {
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return imap.Message{}, nil, err
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}
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switch {
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case mailboxID == proton.InboxLabel:
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wantFlags = wantFlags.Add(proton.MessageFlagReceived)
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case mailboxID == proton.SentLabel:
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wantFlags = wantFlags.Add(proton.MessageFlagSent)
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case header.Has("Received"):
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wantFlags = wantFlags.Add(proton.MessageFlagReceived)
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default:
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wantFlags = wantFlags.Add(proton.MessageFlagSent)
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}
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} else {
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unread = false
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}
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if flags.Contains(imap.FlagAnswered) {
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wantFlags = wantFlags.Add(proton.MessageFlagReplied)
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}
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return conn.importMessage(ctx, literal, wantLabelIDs, wantFlags, unread)
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}
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// AddMessagesToMailbox labels the given messages with the given label ID.
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func (conn *imapConnector) AddMessagesToMailbox(ctx context.Context, messageIDs []imap.MessageID, mailboxID imap.MailboxID) error {
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defer conn.goPollAPIEvents(false)
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return conn.client.LabelMessages(ctx, mapTo[imap.MessageID, string](messageIDs), string(mailboxID))
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}
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// RemoveMessagesFromMailbox unlabels the given messages with the given label ID.
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func (conn *imapConnector) RemoveMessagesFromMailbox(ctx context.Context, messageIDs []imap.MessageID, mailboxID imap.MailboxID) error {
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defer conn.goPollAPIEvents(false)
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if err := conn.client.UnlabelMessages(ctx, mapTo[imap.MessageID, string](messageIDs), string(mailboxID)); err != nil {
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return err
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}
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if mailboxID == proton.TrashLabel || mailboxID == proton.DraftsLabel {
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var metadata []proton.MessageMetadata
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// There's currently no limit on how many IDs we can filter on,
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// but to be nice to API, let's chunk it by 150.
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for _, messageIDs := range xslices.Chunk(messageIDs, 150) {
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m, err := conn.client.GetMessageMetadata(ctx, proton.MessageFilter{
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ID: mapTo[imap.MessageID, string](messageIDs),
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})
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if err != nil {
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return err
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}
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// If a message is not preset in any other label other than AllMail, AllDrafts and AllSent, it can be
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// permanently deleted.
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m = xslices.Filter(m, func(m proton.MessageMetadata) bool {
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labelsThatMatter := xslices.Filter(m.LabelIDs, func(id string) bool {
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return id != proton.AllDraftsLabel && id != proton.AllMailLabel && id != proton.AllSentLabel
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})
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return len(labelsThatMatter) == 0
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})
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metadata = append(metadata, m...)
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}
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if err := conn.client.DeleteMessage(ctx, xslices.Map(metadata, func(m proton.MessageMetadata) string {
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return m.ID
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})...); err != nil {
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return err
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}
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}
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return nil
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}
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// MoveMessages removes the given messages from one label and adds them to the other label.
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func (conn *imapConnector) MoveMessages(ctx context.Context, messageIDs []imap.MessageID, labelFromID imap.MailboxID, labelToID imap.MailboxID) (bool, error) {
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defer conn.goPollAPIEvents(false)
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if (labelFromID == proton.InboxLabel && labelToID == proton.SentLabel) ||
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(labelFromID == proton.SentLabel && labelToID == proton.InboxLabel) {
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return false, fmt.Errorf("not allowed")
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}
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shouldExpungeOldLocation := func() bool {
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conn.apiLabelsLock.RLock()
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defer conn.apiLabelsLock.RUnlock()
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var result bool
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if v, ok := conn.apiLabels[string(labelFromID)]; ok && v.Type == proton.LabelTypeLabel {
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result = result || true
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}
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if v, ok := conn.apiLabels[string(labelToID)]; ok && v.Type == proton.LabelTypeFolder {
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result = result || true
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}
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return result
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}()
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if err := conn.client.LabelMessages(ctx, mapTo[imap.MessageID, string](messageIDs), string(labelToID)); err != nil {
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return false, fmt.Errorf("labeling messages: %w", err)
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}
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if shouldExpungeOldLocation {
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if err := conn.client.UnlabelMessages(ctx, mapTo[imap.MessageID, string](messageIDs), string(labelFromID)); err != nil {
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return false, fmt.Errorf("unlabeling messages: %w", err)
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}
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}
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return shouldExpungeOldLocation, nil
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}
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// MarkMessagesSeen sets the seen value of the given messages.
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func (conn *imapConnector) MarkMessagesSeen(ctx context.Context, messageIDs []imap.MessageID, seen bool) error {
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defer conn.goPollAPIEvents(false)
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if seen {
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return conn.client.MarkMessagesRead(ctx, mapTo[imap.MessageID, string](messageIDs)...)
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}
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return conn.client.MarkMessagesUnread(ctx, mapTo[imap.MessageID, string](messageIDs)...)
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}
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// MarkMessagesFlagged sets the flagged value of the given messages.
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func (conn *imapConnector) MarkMessagesFlagged(ctx context.Context, messageIDs []imap.MessageID, flagged bool) error {
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defer conn.goPollAPIEvents(false)
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if flagged {
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return conn.client.LabelMessages(ctx, mapTo[imap.MessageID, string](messageIDs), proton.StarredLabel)
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}
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return conn.client.UnlabelMessages(ctx, mapTo[imap.MessageID, string](messageIDs), proton.StarredLabel)
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}
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|
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// GetUpdates returns a stream of updates that the gluon server should apply.
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// It is recommended that the returned channel is buffered with at least constants.ChannelBufferCount.
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func (conn *imapConnector) GetUpdates() <-chan imap.Update {
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return safe.RLockRet(func() <-chan imap.Update {
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return conn.updateCh[conn.addrID].GetChannel()
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}, conn.updateChLock)
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}
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|
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// GetUIDValidity returns the default UID validity for this user.
|
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func (conn *imapConnector) GetUIDValidity() imap.UID {
|
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return conn.vault.GetUIDValidity(conn.addrID)
|
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}
|
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|
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// SetUIDValidity sets the default UID validity for this user.
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func (conn *imapConnector) SetUIDValidity(validity imap.UID) error {
|
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return conn.vault.SetUIDValidity(conn.addrID, validity)
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}
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|
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// IsMailboxVisible returns whether this mailbox should be visible over IMAP.
|
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func (conn *imapConnector) IsMailboxVisible(_ context.Context, mailboxID imap.MailboxID) bool {
|
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return atomic.LoadUint32(&conn.showAllMail) != 0 || mailboxID != proton.AllMailLabel
|
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}
|
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|
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// Close the connector will no longer be used and all resources should be closed/released.
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func (conn *imapConnector) Close(ctx context.Context) error {
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return nil
|
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}
|
|
|
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func (conn *imapConnector) importMessage(
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ctx context.Context,
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literal []byte,
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labelIDs []string,
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flags proton.MessageFlag,
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unread bool,
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) (imap.Message, []byte, error) {
|
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var full proton.FullMessage
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|
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if err := safe.RLockRet(func() error {
|
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return withAddrKR(conn.apiUser, conn.apiAddrs[conn.addrID], conn.vault.KeyPass(), func(_, addrKR *crypto.KeyRing) error {
|
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messageID := ""
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|
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if slices.Contains(labelIDs, proton.DraftsLabel) {
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msg, err := conn.createDraft(ctx, literal, addrKR, conn.apiAddrs[conn.addrID])
|
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if err != nil {
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return fmt.Errorf("failed to create draft: %w", err)
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}
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// apply labels
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messageID = msg.ID
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} else {
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res, err := stream.Collect(ctx, conn.client.ImportMessages(ctx, addrKR, 1, 1, []proton.ImportReq{{
|
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Metadata: proton.ImportMetadata{
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AddressID: conn.addrID,
|
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LabelIDs: labelIDs,
|
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Unread: proton.Bool(unread),
|
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Flags: flags,
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},
|
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Message: literal,
|
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}}...))
|
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if err != nil {
|
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return fmt.Errorf("failed to import message: %w", err)
|
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}
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|
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messageID = res[0].MessageID
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}
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|
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var err error
|
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|
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if full, err = conn.client.GetFullMessage(ctx, messageID); err != nil {
|
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return fmt.Errorf("failed to fetch message: %w", err)
|
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}
|
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|
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if literal, err = message.BuildRFC822(addrKR, full.Message, full.AttData, defaultJobOpts()); err != nil {
|
|
return fmt.Errorf("failed to build message: %w", err)
|
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}
|
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|
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return nil
|
|
})
|
|
}, conn.apiUserLock, conn.apiAddrsLock); err != nil {
|
|
return imap.Message{}, nil, err
|
|
}
|
|
|
|
return toIMAPMessage(full.MessageMetadata), literal, nil
|
|
}
|
|
|
|
func toIMAPMessage(message proton.MessageMetadata) imap.Message {
|
|
flags := imap.NewFlagSet()
|
|
|
|
if !message.Unread {
|
|
flags = flags.Add(imap.FlagSeen)
|
|
}
|
|
|
|
if slices.Contains(message.LabelIDs, proton.StarredLabel) {
|
|
flags = flags.Add(imap.FlagFlagged)
|
|
}
|
|
|
|
if slices.Contains(message.LabelIDs, proton.DraftsLabel) {
|
|
flags = flags.Add(imap.FlagDraft)
|
|
}
|
|
|
|
var date time.Time
|
|
|
|
if message.Time > 0 {
|
|
date = time.Unix(message.Time, 0)
|
|
} else {
|
|
date = time.Now()
|
|
}
|
|
|
|
return imap.Message{
|
|
ID: imap.MessageID(message.ID),
|
|
Flags: flags,
|
|
Date: date,
|
|
}
|
|
}
|
|
|
|
func (conn *imapConnector) createDraft(ctx context.Context, literal []byte, addrKR *crypto.KeyRing, sender proton.Address) (proton.Message, error) { //nolint:funlen
|
|
// Create a new message parser from the reader.
|
|
parser, err := parser.New(bytes.NewReader(literal))
|
|
if err != nil {
|
|
return proton.Message{}, fmt.Errorf("failed to create parser: %w", err)
|
|
}
|
|
|
|
message, err := message.ParseWithParser(parser)
|
|
if err != nil {
|
|
return proton.Message{}, fmt.Errorf("failed to parse message: %w", err)
|
|
}
|
|
|
|
decBody := string(message.PlainBody)
|
|
if message.RichBody != "" {
|
|
decBody = string(message.RichBody)
|
|
}
|
|
|
|
draft, err := conn.client.CreateDraft(ctx, addrKR, proton.CreateDraftReq{
|
|
Message: proton.DraftTemplate{
|
|
Subject: message.Subject,
|
|
Body: decBody,
|
|
MIMEType: message.MIMEType,
|
|
|
|
Sender: &mail.Address{Name: sender.DisplayName, Address: sender.Email},
|
|
ToList: message.ToList,
|
|
CCList: message.CCList,
|
|
BCCList: message.BCCList,
|
|
|
|
ExternalID: message.ExternalID,
|
|
},
|
|
})
|
|
|
|
if err != nil {
|
|
return proton.Message{}, fmt.Errorf("failed to create draft: %w", err)
|
|
}
|
|
|
|
for _, att := range message.Attachments {
|
|
disposition := proton.AttachmentDisposition
|
|
if att.Disposition == "inline" && att.ContentID != "" {
|
|
disposition = proton.InlineDisposition
|
|
}
|
|
|
|
if _, err := conn.client.UploadAttachment(ctx, addrKR, proton.CreateAttachmentReq{
|
|
MessageID: draft.ID,
|
|
Filename: att.Name,
|
|
MIMEType: rfc822.MIMEType(att.MIMEType),
|
|
Disposition: disposition,
|
|
ContentID: att.ContentID,
|
|
Body: att.Data,
|
|
}); err != nil {
|
|
return proton.Message{}, fmt.Errorf("failed to add attachment to draft: %w", err)
|
|
}
|
|
}
|
|
|
|
return draft, nil
|
|
}
|
|
|
|
func toIMAPMailbox(label proton.Label, flags, permFlags, attrs imap.FlagSet) imap.Mailbox {
|
|
if label.Type == proton.LabelTypeLabel {
|
|
label.Path = append([]string{labelPrefix}, label.Path...)
|
|
} else if label.Type == proton.LabelTypeFolder {
|
|
label.Path = append([]string{folderPrefix}, label.Path...)
|
|
}
|
|
|
|
return imap.Mailbox{
|
|
ID: imap.MailboxID(label.ID),
|
|
Name: label.Path,
|
|
Flags: flags,
|
|
PermanentFlags: permFlags,
|
|
Attributes: attrs,
|
|
}
|
|
}
|