package imap
import (
"bufio"
"encoding/base64"
"fmt"
"io"
"mime/quotedprintable"
"strings"
"github.com/emersion/go-imap"
"github.com/emersion/go-message"
_ "github.com/emersion/go-message/charset"
"github.com/emersion/go-message/mail"
"github.com/emersion/go-message/textproto"
"git.sr.ht/~sircmpwn/aerc/models"
"git.sr.ht/~sircmpwn/aerc/worker/types"
)
func (imapw *IMAPWorker) handleFetchMessageHeaders(
msg *types.FetchMessageHeaders) {
imapw.worker.Logger.Printf("Fetching message headers")
section := &imap.BodySectionName{
BodyPartName: imap.BodyPartName{
Specifier: imap.HeaderSpecifier,
},
Peek: true,
}
items := []imap.FetchItem{
imap.FetchBodyStructure,
imap.FetchEnvelope,
imap.FetchInternalDate,
imap.FetchFlags,
imap.FetchUid,
section.FetchItem(),
}
imapw.handleFetchMessages(msg, msg.Uids, items, section)
}
func (imapw *IMAPWorker) handleFetchMessageBodyPart(
msg *types.FetchMessageBodyPart) {
imapw.worker.Logger.Printf("Fetching message part")
section := &imap.BodySectionName{}
section.Path = msg.Part
items := []imap.FetchItem{
imap.FetchFlags,
imap.FetchUid,
section.FetchItem(),
}
imapw.handleFetchMessages(msg, []uint32{msg.Uid}, items, section)
}
func (imapw *IMAPWorker) handleFetchFullMessages(
msg *types.FetchFullMessages) {
imapw.worker.Logger.Printf("Fetching full messages")
section := &imap.BodySectionName{}
items := []imap.FetchItem{
imap.FetchEnvelope,
imap.FetchFlags,
imap.FetchUid,
section.FetchItem(),
}
imapw.handleFetchMessages(msg, msg.Uids, items, section)
}
func (imapw *IMAPWorker) handleFetchMessages(
msg types.WorkerMessage, uids []uint32, items []imap.FetchItem,
section *imap.BodySectionName) {
messages := make(chan *imap.Message)
done := make(chan error)
go func() {
for _msg := range messages {
imapw.seqMap[_msg.SeqNum-1] = _msg.Uid
switch msg := msg.(type) {
case *types.FetchMessageHeaders:
reader := _msg.GetBody(section)
textprotoHeader, err := textproto.ReadHeader(bufio.NewReader(reader))
var header *mail.Header
if err == nil {
header = &mail.Header{message.Header{textprotoHeader}}
}
imapw.worker.PostMessage(&types.MessageInfo{
Message: types.RespondTo(msg),
Info: &models.MessageInfo{
BodyStructure: translateBodyStructure(_msg.BodyStructure),
Envelope: translateEnvelope(_msg.Envelope),
Flags: translateFlags(_msg.Flags),
InternalDate: _msg.InternalDate,
RFC822Headers: header,
Uid: _msg.Uid,
},
}, nil)
case *types.FetchFullMessages:
r := _msg.GetBody(section)
if r == nil {
done <- fmt.Errorf("could not get section %#v", section)
return
}
imapw.worker.PostMessage(&types.FullMessage{
Message: types.RespondTo(msg),
Content: &models.FullMessage{
Reader: bufio.NewReader(r),
Uid: _msg.Uid,
},
}, nil)
// Update flags (to mark message as read)
imapw.worker.PostMessage(&types.MessageInfo{
Message: types.RespondTo(msg),
Info: &models.MessageInfo{
Flags: translateFlags(_msg.Flags),
Uid: _msg.Uid,
},
}, nil)
case *types.FetchMessageBodyPart:
reader, err := getDecodedPart(msg, _msg, section)
if err != nil {
done <- err
return
}
imapw.worker.PostMessage(&types.MessageBodyPart{
Message: types.RespondTo(msg),
Part: &models.MessageBodyPart{
Reader: reader,
Uid: _msg.Uid,
},
}, nil)
// Update flags (to mark message as read)
imapw.worker.PostMessage(&types.MessageInfo{
Message: types.RespondTo(msg),
Info: &models.MessageInfo{
Flags: translateFlags(_msg.Flags),
Uid: _msg.Uid,
},
}, nil)
}
}
done <- nil
}()
emitErr := func(err error) {
imapw.worker.PostMessage(&types.Error{
Message: types.RespondTo(msg),
Error: err,
}, nil)
}
set := toSeqSet(uids)
if err := imapw.client.UidFetch(set, items, messages); err != nil {
emitErr(err)
return
}
if err := <-done; err != nil {
emitErr(err)
return
}
imapw.worker.PostMessage(
&types.Done{types.RespondTo(msg)}, nil)
}
func getDecodedPart(task *types.FetchMessageBodyPart, msg *imap.Message,
section *imap.BodySectionName) (io.Reader, error) {
var r io.Reader
var err error
r = msg.GetBody(section)
if r == nil {
return nil, fmt.Errorf("getDecodedPart: no message body")
}
r = encodingReader(task.Encoding, r)
if task.Charset != "" {
r, err = message.CharsetReader(task.Charset, r)
}
if err != nil {
return nil, err
}
return r, err
}
func encodingReader(encoding string, r io.Reader) io.Reader {
reader := r
// email parts are encoded as 7bit (plaintext), quoted-printable, or base64
if strings.EqualFold(encoding, "base64") {
reader = base64.NewDecoder(base64.StdEncoding, r)
} else if strings.EqualFold(encoding, "quoted-printable") {
reader = quotedprintable.NewReader(r)
}
return reader
}