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in webmail & webapisrv, store bcc header in sent messages

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when sending a message with bcc's, prepend the bcc header to the message we
store in the sent folder. still not in the message we send to the recipients.
This commit is contained in:
Mechiel Lukkien
2024-04-16 17:57:46 +02:00
parent abd098e8c0
commit c9451d4d06
11 changed files with 42 additions and 11 deletions
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17
webmail/api.go
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@ -286,7 +286,8 @@ func xrandom(ctx context.Context, n int) []byte {
// Bcc message header.
//
// If a Sent mailbox is configured, messages are added to it after submitting
// to the delivery queue.
// to the delivery queue. If Bcc addresses were present, a header is prepended
// to the message stored in the Sent mailbox.
func (w Webmail) MessageSubmit(ctx context.Context, m SubmitMessage) {
// Similar between ../smtpserver/server.go:/submit\( and ../webmail/api.go:/MessageSubmit\( and ../webapisrv/server.go:/Send\(
@ -343,9 +344,11 @@ func (w Webmail) MessageSubmit(ctx context.Context, m SubmitMessage) {
recipients = append(recipients, addr.Address)
}
var bccAddrs []message.NameAddress
for _, s := range m.Bcc {
addr, err := parseAddress(s)
xcheckuserf(ctx, err, "parsing Bcc address")
bccAddrs = append(bccAddrs, addr)
recipients = append(recipients, addr.Address)
}
@ -446,6 +449,7 @@ func (w Webmail) MessageSubmit(ctx context.Context, m SubmitMessage) {
}
xc.HeaderAddrs("To", toAddrs)
xc.HeaderAddrs("Cc", ccAddrs)
// We prepend Bcc headers to the message when adding to the Sent mailbox.
if m.Subject != "" {
xc.Subject(m.Subject)
}
@ -750,6 +754,17 @@ func (w Webmail) MessageSubmit(ctx context.Context, m SubmitMessage) {
xcheckf(ctx, err, "next modseq")
}
// If there were bcc headers, prepend those to the stored message only, before the
// DKIM signature. The DKIM-signature oversigns the bcc header, so this stored
// message won't validate with DKIM anymore, which is fine.
if len(bccAddrs) > 0 {
var sb strings.Builder
xbcc := message.NewComposer(&sb, 100*1024, smtputf8)
xbcc.HeaderAddrs("Bcc", bccAddrs)
xbcc.Flush()
msgPrefix = sb.String() + msgPrefix
}
sentm := store.Message{
CreateSeq: modseq,
ModSeq: modseq,