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implement imap savedate extension, rfc 8514

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it makes a new field available on stored messages. not when they they were
received (over smtp) or appended to the mailbox (over imap), but when they were
last "saved" in the mailbox. copy/move of a message (eg to the trash) resets
the "savedate" value. this helps implement "remove messages from trash after X
days".
This commit is contained in:
Mechiel Lukkien
2025-02-19 17:11:20 +01:00
parent cbe5bb235c
commit 7288e038e6
16 changed files with 136 additions and 10 deletions
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25
imapserver/search.go
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@ -514,6 +514,31 @@ func (s *search) match0(sk searchKey) bool {
case "MODSEQ":
// ../rfc/7162:1045
return s.m.ModSeq.Client() >= *sk.clientModseq
case "SAVEDBEFORE", "SAVEDON", "SAVEDSINCE":
// If we don't have a savedate for this message (for messages received before we
// implemented this feature), we use the "internal date" (received timestamp) of
// the message. ../rfc/8514:237
rt := s.m.Received
if s.m.SaveDate != nil {
rt = *s.m.SaveDate
}
skdt := sk.date.Format("2006-01-02")
rdt := rt.Format("2006-01-02")
switch sk.op {
case "SAVEDBEFORE":
return rdt < skdt
case "SAVEDON":
return rdt == skdt
case "SAVEDSINCE":
return rdt >= skdt
}
panic("missing case")
case "SAVEDATESUPPORTED":
// We return whether we have a savedate for this message. We support it on all
// mailboxes, but we only have this metadata from the time we implemented this
// feature.
return s.m.SaveDate != nil
}
if s.p == nil {