mirror of
https://github.com/mjl-/mox.git
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73 lines
2.2 KiB
Go
73 lines
2.2 KiB
Go
package smtpserver
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import (
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"bytes"
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"context"
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"crypto/sha256"
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"fmt"
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"io"
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"log/slog"
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"os"
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"github.com/mjl-/bstore"
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"github.com/mjl-/mox/message"
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"github.com/mjl-/mox/mlog"
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"github.com/mjl-/mox/moxio"
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"github.com/mjl-/mox/store"
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)
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// rejectPresent returns whether the message is already present in the rejects mailbox.
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func rejectPresent(log mlog.Log, acc *store.Account, rejectsMailbox string, m *store.Message, f *os.File) (present bool, msgID string, hash []byte, rerr error) {
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if p, err := message.Parse(log.Logger, false, store.FileMsgReader(m.MsgPrefix, f)); err != nil {
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log.Infox("parsing reject message for message-id", err)
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} else if header, err := p.Header(); err != nil {
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log.Infox("parsing reject message header for message-id", err)
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} else {
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msgID, _, err = message.MessageIDCanonical(header.Get("Message-Id"))
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if err != nil {
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log.Debugx("parsing message-id for reject", err, slog.String("messageid", header.Get("Message-Id")))
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}
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}
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// We must not read MsgPrefix, it will likely change for subsequent deliveries.
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h := sha256.New()
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if _, err := io.Copy(h, &moxio.AtReader{R: f}); err != nil {
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log.Infox("copying reject message to hash", err)
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} else {
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hash = h.Sum(nil)
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}
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if msgID == "" && len(hash) == 0 {
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return false, "", nil, fmt.Errorf("no message-id or hash for determining reject message presence")
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}
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var exists bool
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var err error
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acc.WithRLock(func() {
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err = acc.DB.Read(context.TODO(), func(tx *bstore.Tx) error {
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mbq := bstore.QueryTx[store.Mailbox](tx)
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mbq.FilterNonzero(store.Mailbox{Name: rejectsMailbox})
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mb, err := mbq.Get()
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if err == bstore.ErrAbsent {
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return nil
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}
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if err != nil {
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return fmt.Errorf("looking for rejects mailbox: %w", err)
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}
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q := bstore.QueryTx[store.Message](tx)
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q.FilterNonzero(store.Message{MailboxID: mb.ID})
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q.FilterEqual("Expunged", false)
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q.FilterFn(func(m store.Message) bool {
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return msgID != "" && m.MessageID == msgID || len(hash) > 0 && bytes.Equal(m.MessageHash, hash)
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})
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exists, err = q.Exists()
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return err
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})
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})
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if err != nil {
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return false, "", nil, fmt.Errorf("querying for presence of reject message: %w", err)
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}
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return exists, msgID, hash, nil
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}
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