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|
package imap
import (
"crypto/tls"
"crypto/x509"
"fmt"
"log"
"net/url"
"strings"
"github.com/emersion/go-imap"
"github.com/emersion/go-imap-idle"
"github.com/emersion/go-imap/client"
"git.sr.ht/~sircmpwn/aerc2/worker/types"
)
var errUnsupported = fmt.Errorf("unsupported command")
type imapClient struct {
*client.Client
*idle.IdleClient
}
type IMAPWorker struct {
messages chan types.WorkerMessage
actions chan types.WorkerMessage
config struct {
scheme string
insecure bool
addr string
user *url.Userinfo
}
client *imapClient
updates chan client.Update
logger *log.Logger
}
func NewIMAPWorker(logger *log.Logger) *IMAPWorker {
return &IMAPWorker{
messages: make(chan types.WorkerMessage, 50),
actions: make(chan types.WorkerMessage, 50),
updates: make(chan client.Update, 50),
logger: logger,
}
}
func (w *IMAPWorker) GetMessages() chan types.WorkerMessage {
return w.messages
}
func (w *IMAPWorker) PostAction(msg types.WorkerMessage) {
w.actions <- msg
}
func (w *IMAPWorker) postMessage(msg types.WorkerMessage) {
w.logger.Printf("=> %T\n", msg)
w.messages <- msg
}
func (w *IMAPWorker) verifyPeerCert(msg types.WorkerMessage) func(
rawCerts [][]byte, _ [][]*x509.Certificate) error {
return func(rawCerts [][]byte, _ [][]*x509.Certificate) error {
pool := x509.NewCertPool()
for _, rawCert := range rawCerts {
cert, err := x509.ParseCertificate(rawCert)
if err != nil {
return err
}
pool.AddCert(cert)
}
request := types.ApproveCertificate{
Message: types.RespondTo(msg),
CertPool: pool,
}
w.postMessage(request)
response := <-w.actions
if response.InResponseTo() != request {
return fmt.Errorf("Expected UI to answer cert request")
}
switch response.(type) {
case types.Ack:
return nil
case types.Disconnect:
return fmt.Errorf("UI rejected certificate")
default:
return fmt.Errorf("Expected UI to answer cert request")
}
}
}
func (w *IMAPWorker) handleMessage(msg types.WorkerMessage) error {
switch msg := msg.(type) {
case types.Ping:
// No-op
case types.Configure:
u, err := url.Parse(msg.Config.Source)
if err != nil {
return err
}
w.config.scheme = u.Scheme
if strings.HasSuffix(w.config.scheme, "+insecure") {
w.config.scheme = strings.TrimSuffix(w.config.scheme, "+insecure")
w.config.insecure = true
}
w.config.addr = u.Host
if !strings.ContainsRune(w.config.addr, ':') {
w.config.addr += ":" + u.Scheme
}
w.config.scheme = u.Scheme
w.config.user = u.User
case types.Connect:
var (
c *client.Client
err error
)
tlsConfig := &tls.Config{
InsecureSkipVerify: true,
VerifyPeerCertificate: w.verifyPeerCert(&msg),
}
switch w.config.scheme {
case "imap":
c, err = client.Dial(w.config.addr)
if err != nil {
return err
}
if !w.config.insecure {
if err := c.StartTLS(tlsConfig); err != nil {
return err
}
}
case "imaps":
c, err = client.DialTLS(w.config.addr, tlsConfig)
if err != nil {
return err
}
default:
return fmt.Errorf("Unknown IMAP scheme %s", w.config.scheme)
}
if w.config.user != nil {
username := w.config.user.Username()
password, hasPassword := w.config.user.Password()
if !hasPassword {
// TODO: ask password
}
if err := c.Login(username, password); err != nil {
return err
}
}
if _, err := c.Select(imap.InboxName, false); err != nil {
return err
}
c.Updates = w.updates
w.client = &imapClient{c, idle.NewClient(c)}
// TODO: don't idle right away
go w.client.IdleWithFallback(nil, 0)
default:
return errUnsupported
}
return nil
}
func (w *IMAPWorker) Run() {
for {
select {
case msg := <-w.actions:
w.logger.Printf("<= %T\n", msg)
if err := w.handleMessage(msg); err == errUnsupported {
w.postMessage(types.Unsupported{
Message: types.RespondTo(msg),
})
} else if err != nil {
w.postMessage(types.Error{
Message: types.RespondTo(msg),
Error: err,
})
} else {
w.postMessage(types.Ack{
Message: types.RespondTo(msg),
})
}
case update := <-w.updates:
w.logger.Printf("[= %T", update)
}
}
}
|
