package maildir
import (
"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/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
worker *types.Worker
watcher *fsnotify.Watcher
}
// 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)
}
}
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.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
}
w.worker.PostMessage(&types.DirectoryContents{
Uids: uids,
}, 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) 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.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.ReadMessages:
return w.handleReadMessages(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 {
defer w.done(msg)
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)
}
w.c = NewContainer(dir, w.worker.Logger)
w.worker.Logger.Printf("configured base maildir: %s", dir)
return nil
}
func (w *Worker) handleConnect(msg *types.Connect) error {
w.done(msg)
return nil
}
func (w *Worker) handleListDirectories(msg *types.ListDirectories) error {
defer w.done(msg)
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)
}
return nil
}
func (w *Worker) handleOpenDirectory(msg *types.OpenDirectory) error {
defer w.done(msg)
w.worker.Logger.Printf("opening %s", msg.Directory)
// 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)
}
}
// open the directory
dir, err := w.c.OpenDirectory(msg.Directory)
if err != nil {
return err
}
w.selected = &dir
// 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)
}
// TODO: why does this need to be sent twice??
info := &types.DirectoryInfo{
Info: &models.DirectoryInfo{
Name: msg.Directory,
Flags: []string{},
ReadOnly: false,
// total messages
Exists: 0,
// new messages since mailbox was last opened
Recent: 0,
// total unread
Unseen: 0,
},
}
w.worker.PostMessage(info, nil)
w.worker.PostMessage(info, nil)
return nil
}
func (w *Worker) handleFetchDirectoryContents(
msg *types.FetchDirectoryContents) error {
defer w.done(msg)
uids, err := w.c.UIDs(*w.selected)
if err != nil {
w.worker.Logger.Printf("error scanning uids: %v", err)
return err
}
w.worker.PostMessage(&types.DirectoryContents{
Message: types.RespondTo(msg),
Uids: uids,
}, nil)
return nil
}
func (w *Worker) handleCreateDirectory(msg *types.CreateDirectory) error {
dir := w.c.Dir(msg.Directory)
defer w.done(msg)
if err := dir.Create(); err != nil {
w.worker.Logger.Printf("could not create directory %s: %v",
msg.Directory, err)
return err
}
return nil
}
func (w *Worker) handleFetchMessageHeaders(
msg *types.FetchMessageHeaders) error {
defer w.done(msg)
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 {
defer w.done(msg)
// 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)
// mark message as read
if err := m.MarkRead(true); err != nil {
w.worker.Logger.Printf("could not mark message as read: %v", err)
return err
}
// send updated flags to ui
info, err := m.MessageInfo()
if err != nil {
w.worker.Logger.Printf("could not fetch message info: %v", err)
return err
}
w.worker.PostMessage(&types.MessageInfo{
Message: types.RespondTo(msg),
Info: info,
}, nil)
return nil
}
func (w *Worker) handleFetchFullMessages(msg *types.FetchFullMessages) error {
defer w.done(msg)
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 {
defer w.done(msg)
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
}
return nil
}
func (w *Worker) handleReadMessages(msg *types.ReadMessages) error {
defer w.done(msg)
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.MarkRead(msg.Read); err != nil {
w.worker.Logger.Printf("could not mark message as read: %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) handleCopyMessages(msg *types.CopyMessages) error {
defer w.done(msg)
dest := w.c.Dir(msg.Destination)
return w.c.CopyAll(dest, *w.selected, msg.Uids)
}
func (w *Worker) handleAppendMessage(msg *types.AppendMessage) error {
defer w.done(msg)
dest := w.c.Dir(msg.Destination)
delivery, err := dest.NewDelivery()
if err != nil {
w.worker.Logger.Printf("could not deliver message to %s: %v",
msg.Destination, err)
return err
}
defer delivery.Close()
if _, err := io.Copy(delivery, msg.Reader); err != nil {
w.worker.Logger.Printf("could not write message to destination: %v", err)
return err
}
return nil
}
func (w *Worker) handleSearchDirectory(msg *types.SearchDirectory) error {
return errUnsupported
}