package maildir
import (
"errors"
"fmt"
"io"
"net/url"
"os"
"path/filepath"
"github.com/emersion/go-maildir"
"github.com/fsnotify/fsnotify"
"git.sr.ht/~rjarry/aerc/models"
"git.sr.ht/~rjarry/aerc/worker/handlers"
"git.sr.ht/~rjarry/aerc/worker/lib"
"git.sr.ht/~rjarry/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
}
err := w.c.SyncNewMail(*w.selected)
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)
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
}
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++
}
if w.c.IsRecent(uid) {
dirInfo.Recent++
}
}
dirInfo.Unseen += dirInfo.Recent
dirInfo.Exists = len(uids) + dirInfo.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 {
info, err := w.msgInfoFromUid(uid)
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 {
info, err := w.msgInfoFromUid(uid)
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.c.ClearRecentFlag(uid)
}
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
}
func (w *Worker) msgInfoFromUid(uid uint32) (*models.MessageInfo, error) {
m, err := w.c.Message(*w.selected, uid)
if err != nil {
return nil, err
}
info, err := m.MessageInfo()
if err != nil {
return nil, err
}
if w.c.IsRecent(uid) {
info.Flags = append(info.Flags, models.RecentFlag)
}
return info, nil
}
