460 lines
9.1 KiB
Go
460 lines
9.1 KiB
Go
package imap
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import (
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"errors"
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"log"
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"strings"
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"sync"
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"time"
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"github.com/emersion/go-imap"
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imapbackend "github.com/emersion/go-imap/backend"
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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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const delimiter = "/"
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type mailbox struct {
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name string
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label string
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flags []string
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u *user
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db *database.Mailbox
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initialized bool
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initializedLock sync.Mutex
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total, unread int
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}
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func (mbox *mailbox) Name() string {
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return mbox.name
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}
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func (mbox *mailbox) Info() (*imap.MailboxInfo, error) {
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return &imap.MailboxInfo{
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Attributes: append(mbox.flags, imap.NoInferiorsAttr),
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Delimiter: delimiter,
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Name: mbox.name,
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}, nil
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}
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func (mbox *mailbox) Status(items []imap.StatusItem) (*imap.MailboxStatus, error) {
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status := imap.NewMailboxStatus(mbox.name, items)
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status.Flags = mbox.flags
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status.PermanentFlags = []string{imap.SeenFlag, imap.FlaggedFlag, imap.DeletedFlag}
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status.UnseenSeqNum = 0 // TODO
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for _, name := range items {
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switch name {
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case imap.StatusMessages:
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status.Messages = uint32(mbox.total)
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case imap.StatusUidNext:
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uidNext, err := mbox.db.UidNext()
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if err != nil {
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return nil, err
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}
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status.UidNext = uidNext
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case imap.StatusUidValidity:
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status.UidValidity = 1
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case imap.StatusRecent:
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status.Recent = 0
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case imap.StatusUnseen:
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status.Unseen = uint32(mbox.unread)
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}
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}
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return status, nil
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}
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func (mbox *mailbox) SetSubscribed(subscribed bool) error {
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return errNotYetImplemented // TODO
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}
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func (mbox *mailbox) Check() error {
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return nil
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}
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func (mbox *mailbox) sync() error {
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log.Printf("Synchronizing mailbox %v...", mbox.name)
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filter := &protonmail.MessageFilter{
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PageSize: 150,
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Label: mbox.label,
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Sort: "ID",
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Asc: true,
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}
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total := -1
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for {
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offset := filter.PageSize * filter.Page
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if total >= 0 && offset > total {
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break
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}
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var page []*protonmail.Message
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var err error
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total, page, err = mbox.u.c.ListMessages(filter)
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if err != nil {
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return err
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}
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if err := mbox.db.Sync(page); err != nil {
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return err
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}
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filter.Page++
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}
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log.Printf("Synchronizing mailbox %v: done.", mbox.name)
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return nil
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}
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func (mbox *mailbox) init() error {
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mbox.initializedLock.Lock()
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defer mbox.initializedLock.Unlock()
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if mbox.initialized {
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return nil
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}
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// TODO: sync only the first time
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if err := mbox.sync(); err != nil {
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return err
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}
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mbox.initialized = true
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return nil
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}
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func (mbox *mailbox) reset() error {
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mbox.initializedLock.Lock()
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defer mbox.initializedLock.Unlock()
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mbox.initialized = false
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return mbox.db.Reset()
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}
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func (mbox *mailbox) fetchMessage(isUid bool, id uint32, items []imap.FetchItem) (*imap.Message, error) {
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var apiID string
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var err error
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if isUid {
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apiID, err = mbox.db.FromUid(id)
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} else {
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apiID, err = mbox.db.FromSeqNum(id)
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}
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if err != nil {
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return nil, err
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}
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seqNum, uid, err := mbox.db.FromApiID(apiID)
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if err != nil {
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return nil, err
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}
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msg, err := mbox.u.db.Message(apiID)
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if err != nil {
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return nil, err
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}
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fetched := imap.NewMessage(seqNum, items)
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for _, item := range items {
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switch item {
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case imap.FetchEnvelope:
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fetched.Envelope = fetchEnvelope(msg)
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case imap.FetchBody, imap.FetchBodyStructure:
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bs, err := mbox.fetchBodyStructure(msg, item == imap.FetchBodyStructure)
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if err != nil {
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return nil, err
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}
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fetched.BodyStructure = bs
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case imap.FetchFlags:
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fetched.Flags = fetchFlags(msg)
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case imap.FetchInternalDate:
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fetched.InternalDate = time.Unix(msg.Time, 0)
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case imap.FetchRFC822Size:
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fetched.Size = uint32(msg.Size)
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case imap.FetchUid:
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fetched.Uid = uid
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default:
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section, err := imap.ParseBodySectionName(item)
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if err != nil {
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break
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}
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l, err := mbox.fetchBodySection(msg, section)
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if err != nil {
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return nil, err
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}
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fetched.Body[section] = l
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}
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}
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return fetched, nil
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}
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func (mbox *mailbox) ListMessages(uid bool, seqSet *imap.SeqSet, items []imap.FetchItem, ch chan<- *imap.Message) error {
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defer close(ch)
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if err := mbox.init(); err != nil {
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return err
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}
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for _, seq := range seqSet.Set {
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start := seq.Start
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if start == 0 {
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start = 1
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}
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stop := seq.Stop
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if stop == 0 {
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if uid {
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uidNext, err := mbox.db.UidNext()
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if err != nil {
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return err
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}
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stop = uidNext - 1
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} else {
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stop = uint32(mbox.total)
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}
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}
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for i := start; i <= stop; i++ {
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msg, err := mbox.fetchMessage(uid, i, items)
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if err == database.ErrNotFound {
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continue
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} else if err != nil {
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return err
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}
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if msg != nil {
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ch <- msg
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}
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}
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}
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return nil
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}
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func matchString(s, substr string) bool {
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return strings.Contains(strings.ToLower(s), strings.ToLower(substr))
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}
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func (mbox *mailbox) SearchMessages(isUID bool, c *imap.SearchCriteria) ([]uint32, error) {
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if err := mbox.init(); err != nil {
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return nil, err
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}
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// TODO: c.Not, c.Or
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if c.Not != nil || c.Or != nil {
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return nil, errors.New("search queries with NOT or OR clauses or not yet implemented")
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}
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var results []uint32
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err := mbox.db.ForEach(func(seqNum, uid uint32, apiID string) error {
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if c.SeqNum != nil && !c.SeqNum.Contains(seqNum) {
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return nil
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}
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if c.Uid != nil && !c.Uid.Contains(uid) {
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return nil
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}
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// TODO: fetch message from local DB only if needed
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msg, err := mbox.u.db.Message(apiID)
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if err != nil {
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return err
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}
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flags := make(map[string]bool)
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for _, flag := range fetchFlags(msg) {
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flags[flag] = true
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}
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for _, f := range c.WithFlags {
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if !flags[f] {
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return nil
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}
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}
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for _, f := range c.WithoutFlags {
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if flags[f] {
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return nil
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}
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}
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date := time.Unix(msg.Time, 0).Round(24 * time.Hour)
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if !c.Since.IsZero() && !date.After(c.Since) {
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return nil
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}
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if !c.Before.IsZero() && !date.Before(c.Before) {
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return nil
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}
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// TODO: this date should be from the Date MIME header
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if !c.SentBefore.IsZero() && !date.Before(c.SentBefore) {
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return nil
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}
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if !c.SentSince.IsZero() && !date.After(c.SentSince) {
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return nil
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}
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h := messageHeader(msg)
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for key, wantValues := range c.Header {
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values, ok := h[key]
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for _, wantValue := range wantValues {
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if wantValue == "" && !ok {
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return nil
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}
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if wantValue != "" {
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ok := false
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for _, v := range values {
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if matchString(v, wantValue) {
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ok = true
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break
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}
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}
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if !ok {
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return nil
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}
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}
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}
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}
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// TODO: c.Body, c.Text
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if c.Larger > 0 && uint32(msg.Size) < c.Larger {
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return nil
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}
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if c.Smaller > 0 && uint32(msg.Size) > c.Smaller {
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return nil
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}
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if isUID {
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results = append(results, uid)
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} else {
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results = append(results, seqNum)
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}
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return nil
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})
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if err != nil {
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return nil, err
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}
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return results, nil
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}
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func (mbox *mailbox) CreateMessage(flags []string, date time.Time, body imap.Literal) error {
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if mbox.label != protonmail.LabelDraft {
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return errors.New("cannot create messages outside the Drafts mailbox")
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}
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return errNotYetImplemented
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}
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func (mbox *mailbox) fromSeqSet(isUID bool, seqSet *imap.SeqSet) ([]string, error) {
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var apiIDs []string
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err := mbox.db.ForEach(func(seqNum, uid uint32, apiID string) error {
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var id uint32
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if isUID {
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id = uid
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} else {
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id = seqNum
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}
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if seqSet.Contains(id) {
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apiIDs = append(apiIDs, apiID)
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}
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return nil
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})
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return apiIDs, err
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}
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func (mbox *mailbox) UpdateMessagesFlags(uid bool, seqSet *imap.SeqSet, op imap.FlagsOp, flags []string) error {
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if err := mbox.init(); err != nil {
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return err
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}
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apiIDs, err := mbox.fromSeqSet(uid, seqSet)
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if err != nil {
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return err
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}
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// TODO: imap.SetFlags should remove currently set flags
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for _, flag := range flags {
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var err error
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switch flag {
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case imap.SeenFlag:
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switch op {
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case imap.SetFlags, imap.AddFlags:
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err = mbox.u.c.MarkMessagesRead(apiIDs)
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case imap.RemoveFlags:
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err = mbox.u.c.MarkMessagesUnread(apiIDs)
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}
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case imap.FlaggedFlag:
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switch op {
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case imap.SetFlags, imap.AddFlags:
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err = mbox.u.c.LabelMessages(protonmail.LabelStarred, apiIDs)
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case imap.RemoveFlags:
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err = mbox.u.c.UnlabelMessages(protonmail.LabelStarred, apiIDs)
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}
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case imap.DeletedFlag:
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// TODO
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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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}
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return nil
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}
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func (mbox *mailbox) CopyMessages(uid bool, seqSet *imap.SeqSet, destName string) error {
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if err := mbox.init(); err != nil {
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return err
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}
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apiIDs, err := mbox.fromSeqSet(uid, seqSet)
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if err != nil {
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return err
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}
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dest := mbox.u.getMailboxByLabel(destName)
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if dest == nil {
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return imapbackend.ErrNoSuchMailbox
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}
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if err := mbox.u.c.LabelMessages(dest.label, apiIDs); 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 (mbox *mailbox) MoveMessages(uid bool, seqSet *imap.SeqSet, destName string) error {
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if err := mbox.init(); err != nil {
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return err
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}
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apiIDs, err := mbox.fromSeqSet(uid, seqSet)
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if err != nil {
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return err
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}
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dest := mbox.u.getMailboxByLabel(destName)
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if dest == nil {
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return imapbackend.ErrNoSuchMailbox
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}
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if err := mbox.u.c.LabelMessages(dest.label, apiIDs); err != nil {
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return err
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}
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if err := mbox.u.c.UnlabelMessages(mbox.label, apiIDs); 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 (mbox *mailbox) Expunge() error {
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return errNotYetImplemented // TODO
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}
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