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- package koushin
-
- import (
- "bufio"
- "fmt"
- "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, ".")
- }
-
- type IMAPPartNode struct {
- Path []int
- MIMEType string
- Filename string
- Children []IMAPPartNode
- }
-
- func (node IMAPPartNode) PathString() string {
- l := make([]string, len(node.Path))
- for i, partNum := range node.Path {
- l[i] = strconv.Itoa(partNum)
- }
-
- return strings.Join(l, ".")
- }
-
- func (node IMAPPartNode) IsText() bool {
- return strings.HasPrefix(strings.ToLower(node.MIMEType), "text/")
- }
-
- func (node IMAPPartNode) String() string {
- if node.Filename != "" {
- return fmt.Sprintf("%s (%s)", node.Filename, node.MIMEType)
- } else {
- return node.MIMEType
- }
- }
-
- func imapPartTree(bs *imap.BodyStructure, path []int) *IMAPPartNode {
- if !strings.EqualFold(bs.MIMEType, "multipart") && len(path) == 0 {
- path = []int{1}
- }
-
- var filename string
- if strings.EqualFold(bs.Disposition, "attachment") {
- filename = bs.DispositionParams["filename"]
- }
-
- node := &IMAPPartNode{
- Path: path,
- MIMEType: strings.ToLower(bs.MIMEType + "/" + bs.MIMESubType),
- Filename: filename,
- Children: make([]IMAPPartNode, len(bs.Parts)),
- }
-
- for i, part := range bs.Parts {
- num := i + 1
-
- partPath := append([]int(nil), path...)
- partPath = append(partPath, num)
-
- node.Children[i] = *imapPartTree(part, partPath)
- }
-
- return node
- }
-
- func (msg *imapMessage) PartTree() *IMAPPartNode {
- if msg.BodyStructure == nil {
- return nil
- }
-
- return imapPartTree(msg.BodyStructure, nil)
- }
-
- func listMessages(conn *imapclient.Client, mboxName string) ([]imapMessage, error) {
- if err := ensureMailboxSelected(conn, mboxName); err != nil {
- return nil, err
- }
-
- n := uint32(50)
-
- 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
- }
-
- func getMessagePart(conn *imapclient.Client, mboxName string, uid uint32, partPath []int) (*imapMessage, *message.Entity, error) {
- if err := ensureMailboxSelected(conn, mboxName); err != nil {
- return nil, nil, err
- }
-
- seqSet := new(imap.SeqSet)
- seqSet.AddNum(uid)
-
- var partHeaderSection imap.BodySectionName
- partHeaderSection.Peek = true
- partHeaderSection.Specifier = imap.HeaderSpecifier
- partHeaderSection.Path = partPath
-
- var partBodySection imap.BodySectionName
- partBodySection.Peek = true
- partBodySection.Specifier = imap.TextSpecifier
- partBodySection.Path = partPath
-
- fetch := []imap.FetchItem{
- imap.FetchEnvelope,
- imap.FetchUid,
- imap.FetchBodyStructure,
- partHeaderSection.FetchItem(),
- partBodySection.FetchItem(),
- }
-
- ch := make(chan *imap.Message, 1)
- if err := conn.UidFetch(seqSet, fetch, ch); err != nil {
- return nil, nil, err
- }
-
- msg := <-ch
- if msg == nil {
- return nil, nil, fmt.Errorf("server didn't return message")
- }
-
- headerReader := bufio.NewReader(msg.GetBody(&partHeaderSection))
- h, err := textproto.ReadHeader(headerReader)
- if err != nil {
- return nil, nil, err
- }
-
- part, err := message.New(message.Header{h}, msg.GetBody(&partBodySection))
- if err != nil {
- return nil, nil, err
- }
-
- return &imapMessage{msg}, part, nil
- }
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