324 lines
8.7 KiB
Go
324 lines
8.7 KiB
Go
package imap
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import (
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"log"
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"sync"
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"github.com/emersion/go-imap"
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"github.com/emersion/go-imap-specialuse"
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imapbackend "github.com/emersion/go-imap/backend"
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"golang.org/x/crypto/openpgp"
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"github.com/emersion/hydroxide/events"
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"github.com/emersion/hydroxide/imap/database"
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"github.com/emersion/hydroxide/protonmail"
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)
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var systemMailboxes = []struct {
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name string
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label string
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flags []string
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}{
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{imap.InboxName, protonmail.LabelInbox, nil},
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{"All Mail", protonmail.LabelAllMail, []string{specialuse.All}},
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{"Archive", protonmail.LabelArchive, []string{specialuse.Archive}},
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{"Drafts", protonmail.LabelDraft, []string{specialuse.Drafts}},
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{"Starred", protonmail.LabelStarred, []string{specialuse.Flagged}},
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{"Spam", protonmail.LabelSpam, []string{specialuse.Junk}},
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{"Sent", protonmail.LabelSent, []string{specialuse.Sent}},
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{"Trash", protonmail.LabelTrash, []string{specialuse.Trash}},
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}
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type user struct {
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c *protonmail.Client
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u *protonmail.User
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privateKeys openpgp.EntityList
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addrs []*protonmail.Address
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db *database.User
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eventsReceiver *events.Receiver
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locker sync.Mutex
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mailboxes map[string]*mailbox
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done chan<- struct{}
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eventSent chan struct{}
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}
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func newUser(be *backend, c *protonmail.Client, u *protonmail.User, privateKeys openpgp.EntityList, addrs []*protonmail.Address) (*user, error) {
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uu := &user{
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c: c,
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u: u,
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privateKeys: privateKeys,
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addrs: addrs,
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eventSent: make(chan struct{}),
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}
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db, err := database.Open(u.Name + ".db")
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if err != nil {
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return nil, err
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}
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uu.db = db
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if err := uu.initMailboxes(); err != nil {
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return nil, err
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}
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done := make(chan struct{})
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uu.done = done
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ch := make(chan *protonmail.Event)
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go uu.receiveEvents(be.updates, ch)
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uu.eventsReceiver = be.eventsManager.Register(c, u.Name, ch, done)
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return uu, nil
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}
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func (u *user) initMailboxes() error {
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u.locker.Lock()
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defer u.locker.Unlock()
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u.mailboxes = make(map[string]*mailbox)
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for _, data := range systemMailboxes {
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mboxDB, err := u.db.Mailbox(data.label)
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if err != nil {
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return err
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}
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u.mailboxes[data.label] = &mailbox{
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name: data.name,
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label: data.label,
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flags: data.flags,
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u: u,
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db: mboxDB,
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deleted: make(map[string]struct{}),
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}
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}
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counts, err := u.c.CountMessages("")
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if err != nil {
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return err
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}
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for _, count := range counts {
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if mbox, ok := u.mailboxes[count.LabelID]; ok {
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mbox.total = count.Total
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mbox.unread = count.Unread
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}
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}
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return nil
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}
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func (u *user) Username() string {
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return u.u.Name
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}
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func (u *user) ListMailboxes(subscribed bool) ([]imapbackend.Mailbox, error) {
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u.locker.Lock()
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defer u.locker.Unlock()
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list := make([]imapbackend.Mailbox, 0, len(u.mailboxes))
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for _, mbox := range u.mailboxes {
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list = append(list, mbox)
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}
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return list, nil
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}
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func (u *user) getMailboxByLabel(labelID string) *mailbox {
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u.locker.Lock()
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defer u.locker.Unlock()
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return u.mailboxes[labelID]
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}
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func (u *user) getMailbox(name string) *mailbox {
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u.locker.Lock()
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defer u.locker.Unlock()
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for _, mbox := range u.mailboxes {
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if mbox.name == name {
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return mbox
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}
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}
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return nil
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}
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func (u *user) GetMailbox(name string) (imapbackend.Mailbox, error) {
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mbox := u.getMailbox(name)
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if mbox == nil {
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return nil, imapbackend.ErrNoSuchMailbox
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}
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return mbox, nil
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}
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func (u *user) CreateMailbox(name string) error {
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return errNotYetImplemented // TODO
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}
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func (u *user) DeleteMailbox(name string) error {
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return errNotYetImplemented // TODO
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}
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func (u *user) RenameMailbox(existingName, newName string) error {
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return errNotYetImplemented // TODO
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}
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func (u *user) Logout() error {
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close(u.done)
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if err := u.db.Close(); err != nil {
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return err
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}
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u.c = nil
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u.u = nil
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u.privateKeys = nil
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return nil
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}
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func (u *user) poll() {
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go u.eventsReceiver.Poll()
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<-u.eventSent
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}
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func (u *user) receiveEvents(updates chan<- imapbackend.Update, events <-chan *protonmail.Event) {
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for event := range events {
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var eventUpdates []imapbackend.Update
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if event.Refresh&protonmail.EventRefreshMail != 0 {
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log.Println("Reinitializing the whole IMAP database")
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u.locker.Lock()
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for _, mbox := range u.mailboxes {
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if err := mbox.reset(); err != nil {
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log.Printf("cannot reset mailbox %s: %v", mbox.name, err)
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}
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}
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u.locker.Unlock()
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if err := u.db.ResetMessages(); err != nil {
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log.Printf("cannot reset user: %v", err)
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}
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if err := u.initMailboxes(); err != nil {
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log.Printf("cannot reinitialize mailboxes: %v", err)
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}
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} else {
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for _, eventMessage := range event.Messages {
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switch eventMessage.Action {
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case protonmail.EventCreate:
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log.Println("Received create event for message", eventMessage.ID)
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seqNums, err := u.db.CreateMessage(eventMessage.Created)
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if err != nil {
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log.Printf("cannot handle create event for message %s: cannot create message in local DB: %v", eventMessage.ID, err)
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break
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}
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// TODO: what if the message was already in the local DB?
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for labelID, seqNum := range seqNums {
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if mbox := u.getMailboxByLabel(labelID); mbox != nil {
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update := new(imapbackend.MailboxUpdate)
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update.Update = imapbackend.NewUpdate(u.u.Name, mbox.name)
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update.MailboxStatus = imap.NewMailboxStatus(mbox.name, []imap.StatusItem{imap.StatusMessages})
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update.MailboxStatus.Messages = seqNum
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eventUpdates = append(eventUpdates, update)
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}
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}
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case protonmail.EventUpdate, protonmail.EventUpdateFlags:
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log.Println("Received update event for message", eventMessage.ID)
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createdSeqNums, deletedSeqNums, err := u.db.UpdateMessage(eventMessage.ID, eventMessage.Updated)
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if err != nil {
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log.Printf("cannot handle update event for message %s: cannot update message in local DB: %v", eventMessage.ID, err)
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break
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}
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for labelID, seqNum := range createdSeqNums {
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if mbox := u.getMailboxByLabel(labelID); mbox != nil {
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update := new(imapbackend.MailboxUpdate)
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update.Update = imapbackend.NewUpdate(u.u.Name, mbox.name)
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update.MailboxStatus = imap.NewMailboxStatus(mbox.name, []imap.StatusItem{imap.StatusMessages})
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update.MailboxStatus.Messages = seqNum
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eventUpdates = append(eventUpdates, update)
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}
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}
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for labelID, seqNum := range deletedSeqNums {
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if mbox := u.getMailboxByLabel(labelID); mbox != nil {
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update := new(imapbackend.ExpungeUpdate)
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update.Update = imapbackend.NewUpdate(u.u.Name, mbox.name)
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update.SeqNum = seqNum
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eventUpdates = append(eventUpdates, update)
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}
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}
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// Send message updates
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msg, err := u.db.Message(eventMessage.ID)
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if err != nil {
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log.Printf("cannot handle update event for message %s: cannot get updated message from local DB: %v", eventMessage.ID, err)
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break
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}
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for _, labelID := range msg.LabelIDs {
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if _, created := createdSeqNums[labelID]; created {
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// This message has been added to the label's mailbox
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// No need to send a message update
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continue
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}
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if mbox := u.getMailboxByLabel(labelID); mbox != nil {
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seqNum, _, err := mbox.db.FromApiID(eventMessage.ID)
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if err != nil {
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log.Printf("cannot handle update event for message %s: cannot get message sequence number in %s: %v", eventMessage.ID, mbox.name, err)
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continue
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}
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update := new(imapbackend.MessageUpdate)
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update.Update = imapbackend.NewUpdate(u.u.Name, mbox.name)
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update.Message = imap.NewMessage(seqNum, []imap.FetchItem{imap.FetchFlags})
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update.Message.Flags = fetchFlags(msg)
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eventUpdates = append(eventUpdates, update)
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}
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}
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case protonmail.EventDelete:
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log.Println("Received delete event for message", eventMessage.ID)
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seqNums, err := u.db.DeleteMessage(eventMessage.ID)
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if err != nil {
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log.Printf("cannot handle delete event for message %s: cannot delete message from local DB: %v", eventMessage.ID, err)
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break
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}
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for labelID, seqNum := range seqNums {
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if mbox := u.getMailboxByLabel(labelID); mbox != nil {
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update := new(imapbackend.ExpungeUpdate)
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update.Update = imapbackend.NewUpdate(u.u.Name, mbox.name)
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update.SeqNum = seqNum
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eventUpdates = append(eventUpdates, update)
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}
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}
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}
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}
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u.locker.Lock()
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for _, count := range event.MessageCounts {
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if mbox, ok := u.mailboxes[count.LabelID]; ok {
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mbox.total = count.Total
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mbox.unread = count.Unread
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}
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}
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u.locker.Unlock()
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}
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for _, update := range eventUpdates {
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updates <- update
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}
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go func() {
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for _, update := range eventUpdates {
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<-update.Done()
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}
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select {
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case u.eventSent <- struct{}{}:
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default:
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}
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}()
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}
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}
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