package maildir import ( "errors" "fmt" "io" "net/url" "os" "path/filepath" "github.com/emersion/go-maildir" "github.com/fsnotify/fsnotify" "git.sr.ht/~sircmpwn/aerc/models" "git.sr.ht/~sircmpwn/aerc/worker/handlers" "git.sr.ht/~sircmpwn/aerc/worker/lib" "git.sr.ht/~sircmpwn/aerc/worker/types" ) func init() { handlers.RegisterWorkerFactory("maildir", NewWorker) } var errUnsupported = fmt.Errorf("unsupported command") // A Worker handles interfacing between aerc's UI and a group of maildirs. type Worker struct { c *Container selected *maildir.Dir selectedName string worker *types.Worker watcher *fsnotify.Watcher currentSortCriteria []*types.SortCriterion } // NewWorker creates a new maildir worker with the provided worker. func NewWorker(worker *types.Worker) (types.Backend, error) { watch, err := fsnotify.NewWatcher() if err != nil { return nil, fmt.Errorf("could not create file system watcher: %v", err) } return &Worker{worker: worker, watcher: watch}, nil } // Run starts the worker's message handling loop. func (w *Worker) Run() { for { select { case action := <-w.worker.Actions: w.handleAction(action) case ev := <-w.watcher.Events: w.handleFSEvent(ev) } } } func (w *Worker) handleAction(action types.WorkerMessage) { msg := w.worker.ProcessAction(action) if err := w.handleMessage(msg); err == errUnsupported { w.worker.PostMessage(&types.Unsupported{ Message: types.RespondTo(msg), }, nil) } else if err != nil { w.worker.PostMessage(&types.Error{ Message: types.RespondTo(msg), Error: err, }, nil) } else { w.done(msg) } } func (w *Worker) handleFSEvent(ev fsnotify.Event) { // we only care about files being created if ev.Op != fsnotify.Create { return } // if there's not a selected directory to rescan, ignore if w.selected == nil { return } newUnseen, err := w.selected.Unseen() if err != nil { w.worker.Logger.Printf("could not move new to cur : %v", err) return } uids, err := w.c.UIDs(*w.selected) if err != nil { w.worker.Logger.Printf("could not scan UIDs: %v", err) return } sortedUids, err := w.sort(uids, w.currentSortCriteria) if err != nil { w.worker.Logger.Printf("error sorting directory: %v", err) return } w.worker.PostMessage(&types.DirectoryContents{ Uids: sortedUids, }, nil) dirInfo := w.getDirectoryInfo(w.selectedName) dirInfo.Recent = len(newUnseen) w.worker.PostMessage(&types.DirectoryInfo{ Info: dirInfo, }, nil) } func (w *Worker) done(msg types.WorkerMessage) { w.worker.PostMessage(&types.Done{types.RespondTo(msg)}, nil) } func (w *Worker) err(msg types.WorkerMessage, err error) { w.worker.PostMessage(&types.Error{ Message: types.RespondTo(msg), Error: err, }, nil) } func (w *Worker) getDirectoryInfo(name string) *models.DirectoryInfo { dirInfo := &models.DirectoryInfo{ Name: name, Flags: []string{}, ReadOnly: false, // total messages Exists: 0, // new messages since mailbox was last opened Recent: 0, // total unread Unseen: 0, AccurateCounts: true, } dir := w.c.Dir(name) uids, err := w.c.UIDs(dir) if err != nil { w.worker.Logger.Printf("could not get uids: %v", err) return dirInfo } recent, err := dir.UnseenCount() if err != nil { w.worker.Logger.Printf("could not get unseen count: %v", err) } dirInfo.Recent = recent for _, uid := range uids { message, err := w.c.Message(dir, uid) if err != nil { w.worker.Logger.Printf("could not get message: %v", err) continue } flags, err := message.Flags() if err != nil { w.worker.Logger.Printf("could not get flags: %v", err) continue } seen := false for _, flag := range flags { if flag == maildir.FlagSeen { seen = true } } if !seen { dirInfo.Unseen++ } } dirInfo.Unseen += dirInfo.Recent dirInfo.Exists = len(uids) + recent return dirInfo } func (w *Worker) handleMessage(msg types.WorkerMessage) error { switch msg := msg.(type) { case *types.Unsupported: // No-op case *types.Configure: return w.handleConfigure(msg) case *types.Connect: return w.handleConnect(msg) case *types.ListDirectories: return w.handleListDirectories(msg) case *types.OpenDirectory: return w.handleOpenDirectory(msg) case *types.FetchDirectoryContents: return w.handleFetchDirectoryContents(msg) case *types.CreateDirectory: return w.handleCreateDirectory(msg) case *types.RemoveDirectory: return w.handleRemoveDirectory(msg) case *types.FetchMessageHeaders: return w.handleFetchMessageHeaders(msg) case *types.FetchMessageBodyPart: return w.handleFetchMessageBodyPart(msg) case *types.FetchFullMessages: return w.handleFetchFullMessages(msg) case *types.DeleteMessages: return w.handleDeleteMessages(msg) case *types.FlagMessages: return w.handleFlagMessages(msg) case *types.AnsweredMessages: return w.handleAnsweredMessages(msg) case *types.CopyMessages: return w.handleCopyMessages(msg) case *types.AppendMessage: return w.handleAppendMessage(msg) case *types.SearchDirectory: return w.handleSearchDirectory(msg) } return errUnsupported } func (w *Worker) handleConfigure(msg *types.Configure) error { u, err := url.Parse(msg.Config.Source) if err != nil { w.worker.Logger.Printf("error configuring maildir worker: %v", err) return err } dir := u.Path if u.Host == "~" { home, err := os.UserHomeDir() if err != nil { return fmt.Errorf("could not resolve home directory: %v", err) } dir = filepath.Join(home, u.Path) } if len(dir) == 0 { return fmt.Errorf("could not resolve maildir from URL '%s'", msg.Config.Source) } c, err := NewContainer(dir, w.worker.Logger) if err != nil { w.worker.Logger.Printf("could not configure maildir: %s", dir) return err } w.c = c w.worker.Logger.Printf("configured base maildir: %s", dir) return nil } func (w *Worker) handleConnect(msg *types.Connect) error { return nil } func (w *Worker) handleListDirectories(msg *types.ListDirectories) error { // TODO If handleConfigure has returned error, w.c is nil. // It could be better if we skip directory listing completely // when configure fails. if w.c == nil { return errors.New("Incorrect maildir directory") } dirs, err := w.c.ListFolders() if err != nil { w.worker.Logger.Printf("error listing directories: %v", err) return err } for _, name := range dirs { w.worker.PostMessage(&types.Directory{ Message: types.RespondTo(msg), Dir: &models.Directory{ Name: name, Attributes: []string{}, }, }, nil) w.worker.PostMessage(&types.DirectoryInfo{ Info: w.getDirectoryInfo(name), }, nil) } return nil } func (w *Worker) handleOpenDirectory(msg *types.OpenDirectory) error { w.worker.Logger.Printf("opening %s", msg.Directory) // open the directory dir, err := w.c.OpenDirectory(msg.Directory) if err != nil { return err } // remove existing watch path if w.selected != nil { prevDir := filepath.Join(string(*w.selected), "new") if err := w.watcher.Remove(prevDir); err != nil { return fmt.Errorf("could not unwatch previous directory: %v", err) } } w.selected = &dir w.selectedName = msg.Directory // add watch path newDir := filepath.Join(string(*w.selected), "new") if err := w.watcher.Add(newDir); err != nil { return fmt.Errorf("could not add watch to directory: %v", err) } if err := dir.Clean(); err != nil { return fmt.Errorf("could not clean directory: %v", err) } info := &types.DirectoryInfo{ Info: w.getDirectoryInfo(msg.Directory), } w.worker.PostMessage(info, nil) return nil } func (w *Worker) handleFetchDirectoryContents( msg *types.FetchDirectoryContents) error { uids, err := w.c.UIDs(*w.selected) if err != nil { w.worker.Logger.Printf("error scanning uids: %v", err) return err } sortedUids, err := w.sort(uids, msg.SortCriteria) if err != nil { w.worker.Logger.Printf("error sorting directory: %v", err) return err } w.currentSortCriteria = msg.SortCriteria w.worker.PostMessage(&types.DirectoryContents{ Message: types.RespondTo(msg), Uids: sortedUids, }, nil) return nil } func (w *Worker) sort(uids []uint32, criteria []*types.SortCriterion) ([]uint32, error) { if len(criteria) == 0 { return uids, nil } var msgInfos []*models.MessageInfo for _, uid := range uids { m, err := w.c.Message(*w.selected, uid) if err != nil { w.worker.Logger.Printf("could not get message: %v", err) continue } info, err := m.MessageInfo() if err != nil { w.worker.Logger.Printf("could not get message info: %v", err) continue } msgInfos = append(msgInfos, info) } sortedUids, err := lib.Sort(msgInfos, criteria) if err != nil { w.worker.Logger.Printf("could not sort the messages: %v", err) return nil, err } return sortedUids, nil } func (w *Worker) handleCreateDirectory(msg *types.CreateDirectory) error { dir := w.c.Dir(msg.Directory) if err := dir.Init(); err != nil { w.worker.Logger.Printf("could not create directory %s: %v", msg.Directory, err) return err } return nil } func (w *Worker) handleRemoveDirectory(msg *types.RemoveDirectory) error { dir := w.c.Dir(msg.Directory) if err := os.RemoveAll(string(dir)); err != nil { w.worker.Logger.Printf("could not remove directory %s: %v", msg.Directory, err) return err } return nil } func (w *Worker) handleFetchMessageHeaders( msg *types.FetchMessageHeaders) error { for _, uid := range msg.Uids { m, err := w.c.Message(*w.selected, uid) if err != nil { w.worker.Logger.Printf("could not get message: %v", err) w.err(msg, err) continue } info, err := m.MessageInfo() if err != nil { w.worker.Logger.Printf("could not get message info: %v", err) w.err(msg, err) continue } w.worker.PostMessage(&types.MessageInfo{ Message: types.RespondTo(msg), Info: info, }, nil) } return nil } func (w *Worker) handleFetchMessageBodyPart( msg *types.FetchMessageBodyPart) error { // get reader m, err := w.c.Message(*w.selected, msg.Uid) if err != nil { w.worker.Logger.Printf("could not get message %d: %v", msg.Uid, err) return err } r, err := m.NewBodyPartReader(msg.Part) if err != nil { w.worker.Logger.Printf( "could not get body part reader for message=%d, parts=%#v: %v", msg.Uid, msg.Part, err) return err } w.worker.PostMessage(&types.MessageBodyPart{ Message: types.RespondTo(msg), Part: &models.MessageBodyPart{ Reader: r, Uid: msg.Uid, }, }, nil) return nil } func (w *Worker) handleFetchFullMessages(msg *types.FetchFullMessages) error { for _, uid := range msg.Uids { m, err := w.c.Message(*w.selected, uid) if err != nil { w.worker.Logger.Printf("could not get message %d: %v", uid, err) return err } r, err := m.NewReader() if err != nil { w.worker.Logger.Printf("could not get message reader: %v", err) return err } w.worker.PostMessage(&types.FullMessage{ Message: types.RespondTo(msg), Content: &models.FullMessage{ Uid: uid, Reader: r, }, }, nil) } return nil } func (w *Worker) handleDeleteMessages(msg *types.DeleteMessages) error { deleted, err := w.c.DeleteAll(*w.selected, msg.Uids) if len(deleted) > 0 { w.worker.PostMessage(&types.MessagesDeleted{ Message: types.RespondTo(msg), Uids: deleted, }, nil) } if err != nil { w.worker.Logger.Printf("error removing some messages: %v", err) return err } w.worker.PostMessage(&types.DirectoryInfo{ Info: w.getDirectoryInfo(w.selectedName), }, nil) return nil } func (w *Worker) handleAnsweredMessages(msg *types.AnsweredMessages) error { for _, uid := range msg.Uids { m, err := w.c.Message(*w.selected, uid) if err != nil { w.worker.Logger.Printf("could not get message: %v", err) w.err(msg, err) continue } if err := m.MarkReplied(msg.Answered); err != nil { w.worker.Logger.Printf( "could not mark message as answered: %v", err) w.err(msg, err) continue } info, err := m.MessageInfo() if err != nil { w.worker.Logger.Printf("could not get message info: %v", err) w.err(msg, err) continue } w.worker.PostMessage(&types.MessageInfo{ Message: types.RespondTo(msg), Info: info, }, nil) w.worker.PostMessage(&types.DirectoryInfo{ Info: w.getDirectoryInfo(w.selectedName), }, nil) } return nil } func (w *Worker) handleFlagMessages(msg *types.FlagMessages) error { for _, uid := range msg.Uids { m, err := w.c.Message(*w.selected, uid) if err != nil { w.worker.Logger.Printf("could not get message: %v", err) w.err(msg, err) continue } flag := flagToMaildir[msg.Flag] if err := m.SetOneFlag(flag, msg.Enable); err != nil { w.worker.Logger.Printf("could change flag %v to %v on message: %v", flag, msg.Enable, err) w.err(msg, err) continue } info, err := m.MessageInfo() if err != nil { w.worker.Logger.Printf("could not get message info: %v", err) w.err(msg, err) continue } w.worker.PostMessage(&types.MessageInfo{ Message: types.RespondTo(msg), Info: info, }, nil) } w.worker.PostMessage(&types.DirectoryInfo{ Info: w.getDirectoryInfo(w.selectedName), }, nil) return nil } func (w *Worker) handleCopyMessages(msg *types.CopyMessages) error { dest := w.c.Dir(msg.Destination) err := w.c.CopyAll(dest, *w.selected, msg.Uids) if err != nil { return err } w.worker.PostMessage(&types.DirectoryInfo{ Info: w.getDirectoryInfo(w.selectedName), }, nil) w.worker.PostMessage(&types.DirectoryInfo{ Info: w.getDirectoryInfo(msg.Destination), }, nil) return nil } func (w *Worker) handleAppendMessage(msg *types.AppendMessage) error { // since we are the "master" maildir process, we can modify the maildir directly dest := w.c.Dir(msg.Destination) _, writer, err := dest.Create(translateFlags(msg.Flags)) if err != nil { w.worker.Logger.Printf("could not create message at %s: %v", msg.Destination, err) return err } defer writer.Close() if _, err := io.Copy(writer, msg.Reader); err != nil { w.worker.Logger.Printf("could not write message to destination: %v", err) return err } w.worker.PostMessage(&types.DirectoryInfo{ Info: w.getDirectoryInfo(msg.Destination), }, nil) return nil } func (w *Worker) handleSearchDirectory(msg *types.SearchDirectory) error { w.worker.Logger.Printf("Searching directory %v with args: %v", *w.selected, msg.Argv) criteria, err := parseSearch(msg.Argv) if err != nil { return err } w.worker.Logger.Printf("Searching with parsed criteria: %#v", criteria) uids, err := w.search(criteria) if err != nil { return err } w.worker.PostMessage(&types.SearchResults{ Message: types.RespondTo(msg), Uids: uids, }, nil) return nil }