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mailbox.go
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mailbox.go
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package mbox
import (
"io"
"net/mail"
"os"
"time"
"github.com/blabber/mbox"
"github.com/emersion/go-imap"
"github.com/emersion/go-imap/backend/backendutil"
"github.com/emersion/go-message"
)
type mailbox struct {
info *imap.MailboxInfo
f *os.File
readOnly bool
subscribed bool
}
func (m *mailbox) Name() string {
return m.info.Name
}
func (m *mailbox) Info() (*imap.MailboxInfo, error) {
return m.info, nil
}
func (m *mailbox) scanner() (*mbox.Scanner, error) {
if _, err := m.f.Seek(0, io.SeekStart); err != nil {
return nil, err
}
return mbox.NewScanner(m.f), nil
}
func (m *mailbox) Status(items []string) (*imap.MailboxStatus, error) {
status := imap.NewMailboxStatus(m.info.Name, items)
status.ReadOnly = m.readOnly
status.PermanentFlags = []string{imap.SeenFlag, imap.AnsweredFlag, imap.FlaggedFlag, imap.DeletedFlag, imap.DraftFlag}
s, err := m.scanner()
if err != nil {
return nil, err
}
for s.Next() {
msg := s.Message()
status.Messages++
if uid, err := getUID(message.Header(msg.Header)); err == nil && uid > status.UidNext {
status.UidNext = uid
}
}
if err := s.Err(); err != nil {
return nil, err
}
status.UidNext++
status.UidValidity = 1
return status, nil
}
func (m *mailbox) Subscribe() error {
m.subscribed = true
return nil
}
func (m *mailbox) Unsubscribe() error {
m.subscribed = false
return nil
}
func (m *mailbox) Check() error {
return m.f.Sync()
}
func (m *mailbox) ListMessages(isUID bool, seqset *imap.SeqSet, items []string, ch chan<- *imap.Message) error {
defer close(ch)
s, err := m.scanner()
if err != nil {
return err
}
var seqnum uint32
for s.Next() {
msg := s.Message()
seqnum++
uid, err := getUID(message.Header(msg.Header))
if err != nil {
continue
}
// Filter messages with seqset
if (isUID && !seqset.Contains(uid)) || (!isUID && !seqset.Contains(seqnum)) {
continue
}
e := message.NewEntity(message.Header(msg.Header), msg.Body)
imapMsg := imap.NewMessage(seqnum, items)
imapMsg.Uid = uid
if err := getMessage(e, imapMsg, items); err != nil {
return err
}
ch <- imapMsg
}
return s.Err()
}
func (m *mailbox) SearchMessages(isUID bool, criteria *imap.SearchCriteria) ([]uint32, error) {
s, err := m.scanner()
if err != nil {
return nil, err
}
var matches []uint32
var seqnum uint32
for s.Next() {
msg := s.Message()
seqnum++
h := message.Header(msg.Header)
uid, err := getUID(h)
if err != nil {
continue
}
if !backendutil.MatchSeqNumAndUid(seqnum, uid, criteria) {
continue
}
if flags := getFlags(h); !backendutil.MatchFlags(flags, criteria) {
continue
}
e := message.NewEntity(h, msg.Body)
if ok, err := backendutil.Match(e, criteria); err != nil || !ok {
continue
}
if isUID {
matches = append(matches, uid)
} else {
matches = append(matches, seqnum)
}
}
return matches, s.Err()
}
func (m *mailbox) CreateMessage(flags []string, date time.Time, body imap.Literal) error {
if _, err := m.f.Seek(0, io.SeekEnd); err != nil {
return err
}
e, err := message.Read(body)
if err != nil {
return err
}
setFlags(e.Header, flags)
// TODO: write date to a header field too
msg := &mail.Message{
Header: mail.Header(e.Header),
Body: e.Body,
}
w := mbox.NewWriter(m.f)
_, err = w.WriteMessage(msg)
return err
}
func (m *mailbox) UpdateMessagesFlags(isUID bool, seqset *imap.SeqSet, operation imap.FlagsOp, flags []string) error {
return nil // TODO
}
func (m *mailbox) CopyMessages(isUID bool, seqset *imap.SeqSet, dest string) error {
return nil // TODO
}
func (m *mailbox) Expunge() error {
return nil // TODO
}