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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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11
imapserver/fetch.go
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@ -404,6 +404,17 @@ func (cmd *fetchCmd) xprocessAtt(a fetchAtt) []token {
m := cmd.xensureMessage()
return []token{bare("INTERNALDATE"), dquote(m.Received.Format("_2-Jan-2006 15:04:05 -0700"))}
case "SAVEDATE":
m := cmd.xensureMessage()
// For messages in storage from before we implemented this extension, we don't have
// a savedate, and we return nil. This is normally meant to be per mailbox, but
// returning it per message should be fine. ../rfc/8514:191
var savedate token = nilt
if m.SaveDate != nil {
savedate = dquote(m.SaveDate.Format("_2-Jan-2006 15:04:05 -0700"))
}
return []token{bare("SAVEDATE"), savedate}
case "BODYSTRUCTURE":
_, part := cmd.xensureParsed()
bs := xbodystructure(part, true)