aerc/worker/imap/fetch.go

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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/logging"
"git.sr.ht/~rjarry/aerc/models"
"git.sr.ht/~rjarry/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,
}
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items := []imap.FetchItem{
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imap.FetchBodyStructure,
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imap.FetchEnvelope,
imap.FetchInternalDate,
imap.FetchFlags,
imap.FetchUid,
section.FetchItem(),
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}
imapw.handleFetchMessages(msg, msg.Uids, items,
func(_msg *imap.Message) error {
reader := _msg.GetBody(section)
textprotoHeader, err := textproto.ReadHeader(bufio.NewReader(reader))
if err != nil {
imapw.worker.Logger.Printf(
"message %v: could not read header: %v", _msg.Uid, err)
imapw.worker.PostMessage(&types.Error{
Message: types.RespondTo(msg),
Error: err,
}, nil)
return nil
}
header := &mail.Header{Header: message.Header{Header: textprotoHeader}}
imapw.worker.PostMessage(&types.MessageInfo{
Message: types.RespondTo(msg),
Info: &models.MessageInfo{
BodyStructure: translateBodyStructure(_msg.BodyStructure),
Envelope: translateEnvelope(_msg.Envelope),
Flags: translateImapFlags(_msg.Flags),
InternalDate: _msg.InternalDate,
RFC822Headers: header,
Uid: _msg.Uid,
},
}, nil)
return nil
})
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}
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func (imapw *IMAPWorker) handleFetchMessageBodyPart(
msg *types.FetchMessageBodyPart) {
imapw.worker.Logger.Printf("Fetching message 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
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 {
headerReader := bufio.NewReader(_msg.GetBody(&partHeaderSection))
h, err := textproto.ReadHeader(headerReader)
if err != nil {
return fmt.Errorf("failed to read part header: %v", err)
}
part, err := message.New(message.Header{Header: h},
_msg.GetBody(&partBodySection))
if err != nil {
return fmt.Errorf("failed to create message reader: %v", 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
})
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}
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,
func(_msg *imap.Message) error {
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
})
}
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func (imapw *IMAPWorker) handleFetchMessages(
msg types.WorkerMessage, uids []uint32, items []imap.FetchItem,
procFunc func(*imap.Message) error) {
messages := make(chan *imap.Message)
done := make(chan error)
go func() {
defer logging.PanicHandler()
var reterr error
for _msg := range messages {
imapw.seqMap[_msg.SeqNum-1] = _msg.Uid
err := procFunc(_msg)
if err != nil {
if reterr == nil {
reterr = err
}
// drain the channel upon error
for range messages {
}
}
}
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 err := <-done; err != nil {
emitErr(err)
return
}
imapw.worker.PostMessage(
&types.Done{Message: types.RespondTo(msg)}, nil)
}