package imap
import (
"bufio"
"fmt"
"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/~rjarry/aerc/lib/log"
"git.sr.ht/~rjarry/aerc/lib/parse"
"git.sr.ht/~rjarry/aerc/models"
"git.sr.ht/~rjarry/aerc/worker/types"
)
func (imapw *IMAPWorker) handleFetchMessageHeaders(
msg *types.FetchMessageHeaders,
) {
if msg.Context.Err() != nil {
imapw.worker.PostMessage(&types.Cancelled{
Message: types.RespondTo(msg),
}, nil)
return
}
toFetch := msg.Uids
if imapw.config.cacheEnabled && imapw.cache != nil {
toFetch = imapw.getCachedHeaders(msg)
}
if len(toFetch) == 0 {
imapw.worker.PostMessage(&types.Done{Message: types.RespondTo(msg)},
nil)
return
}
imapw.worker.Tracef("Fetching message headers: %v", toFetch)
hdrBodyPart := imap.BodyPartName{
Specifier: imap.HeaderSpecifier,
}
switch {
case len(imapw.config.headersExclude) > 0:
hdrBodyPart.NotFields = true
hdrBodyPart.Fields = imapw.config.headersExclude
case len(imapw.config.headers) > 0:
hdrBodyPart.Fields = imapw.config.headers
}
section := &imap.BodySectionName{
BodyPartName: hdrBodyPart,
Peek: true,
}
items := []imap.FetchItem{
imap.FetchBodyStructure,
imap.FetchEnvelope,
imap.FetchInternalDate,
imap.FetchFlags,
imap.FetchUid,
imap.FetchRFC822Size,
section.FetchItem(),
}
imapw.handleFetchMessages(msg, toFetch, items,
func(_msg *imap.Message) error {
if len(_msg.Body) == 0 {
// ignore duplicate messages with only flag updates
return nil
}
reader := _msg.GetBody(section)
if reader == nil {
return fmt.Errorf("failed to find part: %v", section)
}
textprotoHeader, err := textproto.ReadHeader(bufio.NewReader(reader))
if err != nil {
return fmt.Errorf("failed to read part header: %w", err)
}
header := &mail.Header{Header: message.Header{Header: textprotoHeader}}
info := &models.MessageInfo{
BodyStructure: translateBodyStructure(_msg.BodyStructure),
Envelope: translateEnvelope(_msg.Envelope),
Flags: translateImapFlags(_msg.Flags),
InternalDate: _msg.InternalDate,
RFC822Headers: header,
Refs: parse.MsgIDList(header, "references"),
Size: _msg.Size,
Uid: _msg.Uid,
}
imapw.worker.PostMessage(&types.MessageInfo{
Message: types.RespondTo(msg),
Info: info,
}, nil)
if imapw.config.cacheEnabled && imapw.cache != nil {
imapw.cacheHeader(info)
}
return nil
})
}
func (imapw *IMAPWorker) handleFetchMessageBodyPart(
msg *types.FetchMessageBodyPart,
) {
imapw.worker.Tracef("Fetching message %d part: %v", msg.Uid, msg.Part)
var partHeaderSection imap.BodySectionName
partHeaderSection.Peek = true
if len(msg.Part) > 0 {
partHeaderSection.Specifier = imap.MIMESpecifier
} else {
partHeaderSection.Specifier = imap.HeaderSpecifier
}
partHeaderSection.Path = msg.Part
var partBodySection imap.BodySectionName
if len(msg.Part) > 0 {
partBodySection.Specifier = imap.EntireSpecifier
} else {
partBodySection.Specifier = imap.TextSpecifier
}
partBodySection.Path = msg.Part
partBodySection.Peek = true
items := []imap.FetchItem{
imap.FetchEnvelope,
imap.FetchUid,
imap.FetchBodyStructure,
imap.FetchFlags,
partHeaderSection.FetchItem(),
partBodySection.FetchItem(),
}
imapw.handleFetchMessages(msg, []uint32{msg.Uid}, items,
func(_msg *imap.Message) error {
if len(_msg.Body) == 0 {
// ignore duplicate messages with only flag updates
return nil
}
body := _msg.GetBody(&partHeaderSection)
if body == nil {
return fmt.Errorf("failed to find part: %v", partHeaderSection)
}
h, err := textproto.ReadHeader(bufio.NewReader(body))
if err != nil {
return fmt.Errorf("failed to read part header: %w", err)
}
part, err := message.New(message.Header{Header: h},
_msg.GetBody(&partBodySection))
if message.IsUnknownCharset(err) {
imapw.worker.Warnf("unknown charset encountered "+
"for uid %d", _msg.Uid)
} else if err != nil {
return fmt.Errorf("failed to create message reader: %w", err)
}
imapw.worker.PostMessage(&types.MessageBodyPart{
Message: types.RespondTo(msg),
Part: &models.MessageBodyPart{
Reader: part.Body,
Uid: _msg.Uid,
},
}, nil)
// Update flags (to mark message as read)
imapw.worker.PostMessage(&types.MessageInfo{
Message: types.RespondTo(msg),
Info: &models.MessageInfo{
Flags: translateImapFlags(_msg.Flags),
Uid: _msg.Uid,
},
}, nil)
return nil
})
}
func (imapw *IMAPWorker) handleFetchFullMessages(
msg *types.FetchFullMessages,
) {
imapw.worker.Tracef("Fetching full messages: %v", msg.Uids)
section := &imap.BodySectionName{
Peek: true,
}
items := []imap.FetchItem{
imap.FetchEnvelope,
imap.FetchFlags,
imap.FetchUid,
section.FetchItem(),
}
imapw.handleFetchMessages(msg, msg.Uids, items,
func(_msg *imap.Message) error {
if len(_msg.Body) == 0 {
// ignore duplicate messages with only flag updates
return nil
}
r := _msg.GetBody(section)
if r == nil {
return fmt.Errorf("could not get section %#v", section)
}
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: translateImapFlags(_msg.Flags),
Uid: _msg.Uid,
},
}, nil)
return nil
})
}
func (imapw *IMAPWorker) handleFetchMessageFlags(msg *types.FetchMessageFlags) {
items := []imap.FetchItem{
imap.FetchFlags,
imap.FetchUid,
}
if msg.Context.Err() != nil {
imapw.worker.PostMessage(&types.Cancelled{
Message: types.RespondTo(msg),
}, nil)
return
}
imapw.handleFetchMessages(msg, msg.Uids, items,
func(_msg *imap.Message) error {
imapw.worker.PostMessage(&types.MessageInfo{
Message: types.RespondTo(msg),
Info: &models.MessageInfo{
Flags: translateImapFlags(_msg.Flags),
Uid: _msg.Uid,
},
}, nil)
return nil
})
}
func (imapw *IMAPWorker) handleFetchMessages(
msg types.WorkerMessage, uids []uint32, items []imap.FetchItem,
procFunc func(*imap.Message) error,
) {
var err error
messages := make(chan *imap.Message)
done := make(chan []error)
go func() {
defer log.PanicHandler()
var reterr []error
for msg := range messages {
err := procFunc(msg)
if err != nil {
log.Errorf("failed to process message <%d>: %v", msg.Uid, err)
reterr = append(reterr, err)
}
}
done <- reterr
}()
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 errs := <-done; len(errs) != 0 {
err = errs[0]
if len(errs) > 1 {
err = fmt.Errorf("parsing of %d messages failed", len(errs))
}
emitErr(err)
return
}
imapw.worker.PostMessage(
&types.Done{Message: types.RespondTo(msg)}, nil)
}
