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package koushin
import (
"bufio"
"fmt"
"io/ioutil"
"sort"
"strconv"
"strings"
"github.com/emersion/go-imap"
imapclient "github.com/emersion/go-imap/client"
"github.com/emersion/go-message"
"github.com/emersion/go-message/textproto"
)
func (s *Server) connectIMAP() (*imapclient.Client, error) {
var c *imapclient.Client
var err error
if s.imap.tls {
c, err = imapclient.DialTLS(s.imap.host, nil)
if err != nil {
return nil, err
}
} else {
c, err = imapclient.Dial(s.imap.host)
if err != nil {
return nil, err
}
if !s.imap.insecure {
if err := c.StartTLS(nil); err != nil {
c.Close()
return nil, err
}
}
}
return c, err
}
func listMailboxes(conn *imapclient.Client) ([]*imap.MailboxInfo, error) {
ch := make(chan *imap.MailboxInfo, 10)
done := make(chan error, 1)
go func() {
done <- conn.List("", "*", ch)
}()
var mailboxes []*imap.MailboxInfo
for mbox := range ch {
mailboxes = append(mailboxes, mbox)
}
if err := <-done; err != nil {
return nil, err
}
sort.Slice(mailboxes, func(i, j int) bool {
return mailboxes[i].Name < mailboxes[j].Name
})
return mailboxes, nil
}
func ensureMailboxSelected(conn *imapclient.Client, mboxName string) error {
mbox := conn.Mailbox()
if mbox == nil || mbox.Name != mboxName {
if _, err := conn.Select(mboxName, false); err != nil {
return err
}
}
return nil
}
type imapMessage struct {
*imap.Message
}
func textPartPath(bs *imap.BodyStructure) ([]int, bool) {
if bs.Disposition != "" && !strings.EqualFold(bs.Disposition, "inline") {
return nil, false
}
if strings.EqualFold(bs.MIMEType, "text") {
return []int{1}, true
}
if !strings.EqualFold(bs.MIMEType, "multipart") {
return nil, false
}
textPartNum := -1
for i, part := range bs.Parts {
num := i + 1
if strings.EqualFold(part.MIMEType, "multipart") {
if subpath, ok := textPartPath(part); ok {
return append([]int{num}, subpath...), true
}
}
if !strings.EqualFold(part.MIMEType, "text") {
continue
}
var pick bool
switch strings.ToLower(part.MIMESubType) {
case "plain":
pick = true
case "html":
pick = textPartNum < 0
}
if pick {
textPartNum = num
}
}
if textPartNum > 0 {
return []int{textPartNum}, true
}
return nil, false
}
func (msg *imapMessage) TextPartName() string {
if msg.BodyStructure == nil {
return ""
}
path, ok := textPartPath(msg.BodyStructure)
if !ok {
return ""
}
l := make([]string, len(path))
for i, partNum := range path {
l[i] = strconv.Itoa(partNum)
}
return strings.Join(l, ".")
}
func listMessages(conn *imapclient.Client, mboxName string) ([]imapMessage, error) {
if err := ensureMailboxSelected(conn, mboxName); err != nil {
return nil, err
}
n := uint32(10)
mbox := conn.Mailbox()
from := uint32(1)
to := mbox.Messages
if mbox.Messages > n {
from = mbox.Messages - n
}
seqSet := new(imap.SeqSet)
seqSet.AddRange(from, to)
fetch := []imap.FetchItem{imap.FetchEnvelope, imap.FetchUid, imap.FetchBodyStructure}
ch := make(chan *imap.Message, 10)
done := make(chan error, 1)
go func() {
done <- conn.Fetch(seqSet, fetch, ch)
}()
msgs := make([]imapMessage, 0, n)
for msg := range ch {
msgs = append(msgs, imapMessage{msg})
}
if err := <-done; err != nil {
return nil, err
}
// Reverse list of messages
for i := len(msgs)/2 - 1; i >= 0; i-- {
opp := len(msgs) - 1 - i
msgs[i], msgs[opp] = msgs[opp], msgs[i]
}
return msgs, nil
}
var _ = message.Read
func getMessage(conn *imapclient.Client, mboxName string, uid uint32, partPath []int) (*imap.Message, string, error) {
if err := ensureMailboxSelected(conn, mboxName); err != nil {
return nil, "", err
}
seqSet := new(imap.SeqSet)
seqSet.AddNum(uid)
var textHeaderSection imap.BodySectionName
textHeaderSection.Peek = true
textHeaderSection.Specifier = imap.HeaderSpecifier
textHeaderSection.Path = partPath
var textBodySection imap.BodySectionName
textBodySection.Peek = true
textBodySection.Path = partPath
fetch := []imap.FetchItem{
imap.FetchEnvelope,
imap.FetchUid,
imap.FetchBodyStructure,
textHeaderSection.FetchItem(),
textBodySection.FetchItem(),
}
ch := make(chan *imap.Message, 1)
if err := conn.UidFetch(seqSet, fetch, ch); err != nil {
return nil, "", err
}
msg := <-ch
if msg == nil {
return nil, "", fmt.Errorf("server didn't return message")
}
headerReader := bufio.NewReader(msg.GetBody(&textHeaderSection))
h, err := textproto.ReadHeader(headerReader)
if err != nil {
return nil, "", err
}
text, err := message.New(message.Header{h}, msg.GetBody(&textBodySection))
if err != nil {
return nil, "", err
}
b, err := ioutil.ReadAll(text.Body)
if err != nil {
return nil, "", err
}
return msg, string(b), nil
}
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