Replace hand-rolled IMAP with go-imap
This commit is contained in:
DonVoo
parent
21aa6e39e1
commit
253435d87f
7 changed files with 449 additions and 346 deletions
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@ -1,72 +1,64 @@
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package backend
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import (
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"bufio"
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"crypto/sha256"
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"crypto/tls"
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"errors"
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"fmt"
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"io"
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"net"
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"net/mail"
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"strconv"
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"strings"
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"time"
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"github.com/emersion/go-imap/v2"
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"github.com/emersion/go-imap/v2/imapclient"
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)
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// RawMessage ist eine 1:1 aus der Quelle geholte Nachricht: der Rohkoerper
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// plus die Metadaten, die den sauberen Umzug ausmachen.
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type RawMessage struct {
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MessageID string // aus Header, Schluessel fuer Idempotenz
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MessageID string // aus Envelope/Header, Schluessel fuer Idempotenz
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Body []byte // kompletter RFC822-Rohtext, wird NICHT umgeschrieben
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Flags []string // \Seen \Answered \Flagged ... 1:1 uebernehmen
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InternalDate time.Time // Original-Zeit, per APPEND erhalten
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}
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// Folder ist ein Ordner der Quelle MIT den Infos, die 11-folders.go fuer die
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// Rollen-Zuordnung braucht: dekodierter Name (Umlaute als Klartext, NICHT
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// modified-UTF-7), SPECIAL-USE-Attribute und der Hierarchie-Trenner.
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// Rollen-Zuordnung braucht: dekodierter Name, SPECIAL-USE-Attribute und der
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// Hierarchie-Trenner.
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type Folder struct {
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Name string // dekodiert, z.B. "Gelöschte Objekte" oder "INBOX.Sent"
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Name string // dekodiert, z.B. "Geloeschte Objekte" oder "INBOX.Sent"
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Attrs []string // z.B. ["\\Sent"] aus SPECIAL-USE
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Delim string // "." oder "/" — servereigener Trenner
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Delim string // "." oder "/" - servereigener Trenner
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}
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// SourceMailbox abstrahiert Quelle (IMAP primaer, POP3 Fallback), damit
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// 07-migrate.go gegen ein Interface arbeitet.
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type SourceMailbox interface {
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Folders() ([]Folder, error) // rekursiver Ordnerbaum
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Fetch(folder string) ([]RawMessage, error) // Stream: BODY[] FLAGS INTERNALDATE
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Fetch(folder string) ([]RawMessage, error) // BODY[] FLAGS INTERNALDATE
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Close() error
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}
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// OpenIMAPSource verbindet die Quelle per go-imap/v2.
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//
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// Verschluesselung nach a.SrcSecurity:
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// - "tls": imapclient.DialTLS (impliziter TLS, Port 993)
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// - "starttls": imapclient.DialStartTLS auf Klartext-Port 143
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// - "none": imapclient.Dial (REINER KLARTEXT, alte Provider!)
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//
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// a.SrcInsecure -> tls.Config{InsecureSkipVerify:true} fuer kaputte/selbst-
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// signierte Zerts. go-imap dekodiert modified-UTF-7-Ordnernamen selbst; wir
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// geben in Folder.Name den Klartext weiter.
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func OpenIMAPSource(a Account) (SourceMailbox, error) {
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c, err := dialIMAP(a.SrcHost, a.SrcPort, a.SrcSecurity, a.SrcInsecure)
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c, err := dialIMAPClient(a.SrcHost, a.SrcPort, a.SrcSecurity, a.SrcInsecure)
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if err != nil {
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return nil, err
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}
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if err := c.login(a.SrcUser, a.SrcPass); err != nil {
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if err := c.Login(a.SrcUser, a.SrcPass).Wait(); err != nil {
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_ = c.Close()
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return nil, err
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}
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return &imapSource{c: c}, nil
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return &imapSource{mailbox: &imapClientMailbox{c: c}}, nil
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}
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type imapSource struct {
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c *simpleIMAP
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mailbox *imapClientMailbox
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}
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func (s *imapSource) Folders() ([]Folder, error) {
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boxes, err := s.c.listMailboxes()
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boxes, err := s.mailbox.listMailboxes()
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if err != nil {
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return nil, err
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}
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@ -84,132 +76,15 @@ func (s *imapSource) Folders() ([]Folder, error) {
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}
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func (s *imapSource) Fetch(folder string) ([]RawMessage, error) {
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if err := s.c.selectMailbox(folder); err != nil {
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return nil, err
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}
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return s.c.fetchAll()
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return s.mailbox.fetchAll(folder)
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}
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func (s *imapSource) Close() error {
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return s.c.Close()
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return s.mailbox.Close()
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}
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type simpleIMAP struct {
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conn net.Conn
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r *bufio.Reader
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w *bufio.Writer
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tag int
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}
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func dialIMAP(host string, port int, security string, insecure bool) (*simpleIMAP, error) {
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addr := net.JoinHostPort(host, strconv.Itoa(port))
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tlsCfg := &tls.Config{ServerName: host, InsecureSkipVerify: insecure} //nolint:gosec // explicit legacy-provider option
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var conn net.Conn
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var err error
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if security == "tls" {
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conn, err = tls.Dial("tcp", addr, tlsCfg)
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} else {
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conn, err = net.DialTimeout("tcp", addr, 30*time.Second)
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}
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if err != nil {
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return nil, err
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}
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c := &simpleIMAP{conn: conn, r: bufio.NewReader(conn), w: bufio.NewWriter(conn)}
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if _, err := c.r.ReadString('\n'); err != nil {
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_ = conn.Close()
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return nil, err
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}
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if security == "starttls" {
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if err := c.simple("STARTTLS"); err != nil {
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_ = conn.Close()
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return nil, err
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}
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tlsConn := tls.Client(conn, tlsCfg)
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if err := tlsConn.Handshake(); err != nil {
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_ = conn.Close()
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return nil, err
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}
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c.conn = tlsConn
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c.r = bufio.NewReader(tlsConn)
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c.w = bufio.NewWriter(tlsConn)
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}
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return c, nil
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}
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func (c *simpleIMAP) login(user, pass string) error {
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return c.simpleLabel("LOGIN "+imapQuote(user)+" "+imapQuote(pass), "LOGIN "+imapQuote(user)+" <redacted>")
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}
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func (c *simpleIMAP) selectMailbox(name string) error {
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return c.simple("SELECT " + imapQuote(name))
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}
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func (c *simpleIMAP) simple(cmd string) error {
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return c.simpleLabel(cmd, cmd)
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}
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func (c *simpleIMAP) simpleLabel(cmd, label string) error {
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tag := c.nextTag()
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if _, err := fmt.Fprintf(c.w, "%s %s\r\n", tag, cmd); err != nil {
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return err
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}
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if err := c.w.Flush(); err != nil {
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return err
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}
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for {
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line, err := c.r.ReadString('\n')
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if err != nil {
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return err
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}
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if strings.HasPrefix(line, tag+" ") {
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if strings.Contains(line, " OK") {
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return nil
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}
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return fmt.Errorf("imap %s failed: %s", label, strings.TrimSpace(line))
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}
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}
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}
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func (c *simpleIMAP) fetchAll() ([]RawMessage, error) {
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tag := c.nextTag()
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if _, err := fmt.Fprintf(c.w, "%s UID FETCH 1:* (UID FLAGS INTERNALDATE BODY.PEEK[])\r\n", tag); err != nil {
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return nil, err
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}
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if err := c.w.Flush(); err != nil {
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return nil, err
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}
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var out []RawMessage
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for {
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line, err := c.r.ReadString('\n')
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if err != nil {
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return nil, err
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}
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if strings.HasPrefix(line, tag+" ") {
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if strings.Contains(line, " OK") {
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return out, nil
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}
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return out, fmt.Errorf("imap fetch failed: %s", strings.TrimSpace(line))
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}
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if !strings.HasPrefix(line, "* ") || !strings.Contains(line, " FETCH ") {
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continue
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}
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m := RawMessage{
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Flags: parseFlags(line),
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InternalDate: parseInternalDate(line),
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}
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if n, ok := literalSize(line); ok {
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body := make([]byte, n)
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if _, err := io.ReadFull(c.r, body); err != nil {
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return out, err
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}
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m.Body = body
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m.MessageID = messageID(body)
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if rest, err := c.r.ReadString('\n'); err == nil {
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_ = rest
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}
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out = append(out, m)
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}
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}
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type imapClientMailbox struct {
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c *imapclient.Client
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}
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type imapListMailbox struct {
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@ -218,93 +93,100 @@ type imapListMailbox struct {
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Delim string
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}
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func (c *simpleIMAP) listMailboxes() ([]imapListMailbox, error) {
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tag := c.nextTag()
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if _, err := fmt.Fprintf(c.w, "%s LIST \"\" \"*\"\r\n", tag); err != nil {
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return nil, err
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func dialIMAPClient(host string, port int, security string, insecure bool) (*imapclient.Client, error) {
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addr := net.JoinHostPort(host, strconv.Itoa(port))
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opts := &imapclient.Options{
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TLSConfig: &tls.Config{
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ServerName: host,
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MinVersion: tls.VersionTLS12,
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InsecureSkipVerify: insecure, //nolint:gosec // explicit legacy-provider option
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},
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}
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if err := c.w.Flush(); err != nil {
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return nil, err
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switch strings.ToLower(strings.TrimSpace(security)) {
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case "tls", "":
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return imapclient.DialTLS(addr, opts)
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case "starttls":
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return imapclient.DialStartTLS(addr, opts)
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case "none":
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return imapclient.DialInsecure(addr, opts)
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default:
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return nil, fmt.Errorf("unbekannter IMAP-Security-Modus %q", security)
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}
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}
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func (m *imapClientMailbox) listMailboxes() ([]imapListMailbox, error) {
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cmd := m.c.List("", "*", &imap.ListOptions{ReturnSpecialUse: true})
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defer cmd.Close()
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var out []imapListMailbox
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for {
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line, err := c.r.ReadString('\n')
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data := cmd.Next()
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if data == nil {
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break
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}
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out = append(out, imapListMailbox{
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Name: data.Mailbox,
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Attrs: mailboxAttrsToStrings(data.Attrs),
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Delim: delimString(data.Delim),
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})
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}
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if err := cmd.Close(); err != nil {
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return out, err
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}
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return out, nil
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}
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func (m *imapClientMailbox) fetchAll(folder string) ([]RawMessage, error) {
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if _, err := m.c.Select(folder, &imap.SelectOptions{ReadOnly: true}).Wait(); err != nil {
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return nil, err
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}
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section := &imap.FetchItemBodySection{Peek: true}
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seqSet := imap.SeqSet{}
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seqSet.AddRange(1, 0)
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cmd := m.c.Fetch(seqSet, &imap.FetchOptions{
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Envelope: true,
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Flags: true,
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InternalDate: true,
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BodySection: []*imap.FetchItemBodySection{section},
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})
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defer cmd.Close()
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var out []RawMessage
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for {
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data := cmd.Next()
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if data == nil {
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break
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}
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buf, err := data.Collect()
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if err != nil {
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return nil, err
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return out, err
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}
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if strings.HasPrefix(line, tag+" ") {
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if strings.Contains(line, " OK") {
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return out, nil
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}
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return out, fmt.Errorf("imap list failed: %s", strings.TrimSpace(line))
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}
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if !strings.HasPrefix(line, "* LIST ") {
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continue
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}
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if box, ok := parseListMailbox(strings.TrimSpace(line)); ok {
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out = append(out, box)
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body := buf.FindBodySection(section)
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if body == nil {
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body = []byte{}
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}
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out = append(out, RawMessage{
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MessageID: messageIDFromFetch(buf, body),
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Body: body,
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Flags: flagsToStrings(sanitizeIMAPFlags(buf.Flags)),
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InternalDate: buf.InternalDate,
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})
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}
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if err := cmd.Close(); err != nil {
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return out, err
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}
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return out, nil
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}
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func parseListMailbox(line string) (imapListMailbox, bool) {
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rest := strings.TrimSpace(strings.TrimPrefix(line, "* LIST "))
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if !strings.HasPrefix(rest, "(") {
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return imapListMailbox{}, false
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func (m *imapClientMailbox) Close() error {
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if m == nil || m.c == nil {
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return nil
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}
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endAttrs := strings.Index(rest, ")")
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if endAttrs < 0 {
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return imapListMailbox{}, false
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if err := m.c.Logout().Wait(); err != nil {
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return m.c.Close()
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}
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attrs := strings.Fields(rest[1:endAttrs])
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rest = strings.TrimSpace(rest[endAttrs+1:])
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delim, next, ok := parseIMAPAtomOrQuoted(rest)
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if !ok {
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return imapListMailbox{}, false
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}
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if strings.EqualFold(delim, "NIL") {
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delim = "/"
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}
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rest = strings.TrimSpace(rest[next:])
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name, _, ok := parseIMAPAtomOrQuoted(rest)
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if !ok || name == "" {
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return imapListMailbox{}, false
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}
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return imapListMailbox{Name: name, Attrs: attrs, Delim: delim}, true
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}
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func parseIMAPAtomOrQuoted(s string) (string, int, bool) {
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s = strings.TrimLeft(s, " \t")
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trimmed := len(s)
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if s == "" {
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return "", 0, false
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}
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if s[0] != '"' {
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end := strings.IndexAny(s, " \t\r\n")
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if end < 0 {
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end = len(s)
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}
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return s[:end], trimmed - len(s) + end, true
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}
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var b strings.Builder
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escaped := false
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for i := 1; i < len(s); i++ {
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ch := s[i]
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if escaped {
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b.WriteByte(ch)
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escaped = false
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continue
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}
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if ch == '\\' {
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escaped = true
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continue
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}
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if ch == '"' {
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return b.String(), trimmed - len(s) + i + 1, true
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}
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b.WriteByte(ch)
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}
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return "", 0, false
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return m.c.Close()
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}
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func hasIMAPAttr(attrs []string, want string) bool {
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@ -316,111 +198,60 @@ func hasIMAPAttr(attrs []string, want string) bool {
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return false
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}
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func (c *simpleIMAP) appendMessage(folder string, m RawMessage) error {
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tag := c.nextTag()
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flags := ""
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if len(m.Flags) > 0 {
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flags = " (" + strings.Join(m.Flags, " ") + ")"
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func mailboxAttrsToStrings(attrs []imap.MailboxAttr) []string {
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out := make([]string, 0, len(attrs))
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for _, attr := range attrs {
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out = append(out, string(attr))
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}
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date := ""
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if !m.InternalDate.IsZero() {
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date = " " + imapQuote(m.InternalDate.Format("02-Jan-2006 15:04:05 -0700"))
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return out
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}
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func delimString(delim rune) string {
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if delim == 0 {
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return "/"
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}
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if _, err := fmt.Fprintf(c.w, "%s APPEND %s%s%s {%d}\r\n", tag, imapQuote(folder), flags, date, len(m.Body)); err != nil {
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return err
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}
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if err := c.w.Flush(); err != nil {
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return err
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}
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line, err := c.r.ReadString('\n')
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if err != nil {
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return err
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}
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if !strings.HasPrefix(line, "+") {
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return fmt.Errorf("imap append literal rejected: %s", strings.TrimSpace(line))
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}
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if _, err := c.w.Write(m.Body); err != nil {
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return err
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}
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if _, err := c.w.WriteString("\r\n"); err != nil {
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return err
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}
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if err := c.w.Flush(); err != nil {
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return err
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}
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for {
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line, err := c.r.ReadString('\n')
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if err != nil {
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return err
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return string(delim)
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}
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func sanitizeIMAPFlags(in []imap.Flag) []imap.Flag {
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out := make([]imap.Flag, 0, len(in))
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for _, flag := range in {
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switch strings.ToLower(string(flag)) {
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case `\recent`, `\*`:
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continue
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default:
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out = append(out, flag)
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}
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if strings.HasPrefix(line, tag+" ") {
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if strings.Contains(line, " OK") {
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return nil
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}
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return out
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}
|
||||
|
||||
func flagsToStrings(flags []imap.Flag) []string {
|
||||
out := make([]string, 0, len(flags))
|
||||
for _, flag := range flags {
|
||||
out = append(out, string(flag))
|
||||
}
|
||||
return out
|
||||
}
|
||||
|
||||
func stringsToFlags(flags []string) []imap.Flag {
|
||||
return sanitizeIMAPFlags(func() []imap.Flag {
|
||||
out := make([]imap.Flag, 0, len(flags))
|
||||
for _, flag := range flags {
|
||||
flag = strings.TrimSpace(flag)
|
||||
if flag != "" {
|
||||
out = append(out, imap.Flag(flag))
|
||||
}
|
||||
return fmt.Errorf("imap append failed: %s", strings.TrimSpace(line))
|
||||
}
|
||||
}
|
||||
return out
|
||||
}())
|
||||
}
|
||||
|
||||
func (c *simpleIMAP) nextTag() string {
|
||||
c.tag++
|
||||
return fmt.Sprintf("A%04d", c.tag)
|
||||
}
|
||||
|
||||
func (c *simpleIMAP) Close() error {
|
||||
_ = c.simple("LOGOUT")
|
||||
return c.conn.Close()
|
||||
}
|
||||
|
||||
func imapQuote(s string) string {
|
||||
s = strings.ReplaceAll(s, `\`, `\\`)
|
||||
s = strings.ReplaceAll(s, `"`, `\"`)
|
||||
return `"` + s + `"`
|
||||
}
|
||||
|
||||
func literalSize(line string) (int, bool) {
|
||||
end := strings.LastIndex(line, "}")
|
||||
start := strings.LastIndex(line[:end+1], "{")
|
||||
if start < 0 || end < 0 || end <= start+1 {
|
||||
return 0, false
|
||||
func messageIDFromFetch(buf *imapclient.FetchMessageBuffer, body []byte) string {
|
||||
if buf != nil && buf.Envelope != nil && strings.TrimSpace(buf.Envelope.MessageID) != "" {
|
||||
return strings.TrimSpace(buf.Envelope.MessageID)
|
||||
}
|
||||
n, err := strconv.Atoi(line[start+1 : end])
|
||||
return n, err == nil
|
||||
}
|
||||
|
||||
func parseFlags(line string) []string {
|
||||
i := strings.Index(line, "FLAGS (")
|
||||
if i < 0 {
|
||||
return nil
|
||||
}
|
||||
i += len("FLAGS (")
|
||||
j := strings.Index(line[i:], ")")
|
||||
if j < 0 {
|
||||
return nil
|
||||
}
|
||||
fields := strings.Fields(line[i : i+j])
|
||||
return fields
|
||||
}
|
||||
|
||||
func parseInternalDate(line string) time.Time {
|
||||
i := strings.Index(line, "INTERNALDATE ")
|
||||
if i < 0 {
|
||||
return time.Now()
|
||||
}
|
||||
rest := line[i+len("INTERNALDATE "):]
|
||||
if !strings.HasPrefix(rest, `"`) {
|
||||
return time.Now()
|
||||
}
|
||||
rest = rest[1:]
|
||||
j := strings.Index(rest, `"`)
|
||||
if j < 0 {
|
||||
return time.Now()
|
||||
}
|
||||
t, err := time.Parse("02-Jan-2006 15:04:05 -0700", rest[:j])
|
||||
if err != nil {
|
||||
return time.Now()
|
||||
}
|
||||
return t
|
||||
return messageID(body)
|
||||
}
|
||||
|
||||
func messageID(body []byte) string {
|
||||
|
|
@ -430,10 +261,15 @@ func messageID(body []byte) string {
|
|||
return id
|
||||
}
|
||||
}
|
||||
return fmt.Sprintf("sha256:%x", sha256Bytes(body))
|
||||
return fmt.Sprintf("sha256:%x", sha256.Sum256(body))
|
||||
}
|
||||
|
||||
func sha256Bytes(b []byte) []byte {
|
||||
h := sha256.Sum256(b)
|
||||
return h[:]
|
||||
func isAlreadyExistsError(err error) bool {
|
||||
var imapErr *imap.Error
|
||||
if errors.As(err, &imapErr) {
|
||||
text := strings.ToLower(imapErr.Text)
|
||||
return strings.Contains(text, "exist") || strings.Contains(text, "already")
|
||||
}
|
||||
text := strings.ToLower(err.Error())
|
||||
return strings.Contains(text, "exist") || strings.Contains(text, "already")
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue