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imapserver: implement UIDONLY extension, RFC 9586

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Once clients enable this extension, commands can no longer refer to "message
sequence numbers" (MSNs), but can only refer to messages with UIDs. This means
both sides no longer have to carefully keep their sequence numbers in sync
(error-prone), and don't have to keep track of a mapping of sequence numbers to
UIDs (saves resources).

With UIDONLY enabled, all FETCH responses are replaced with UIDFETCH response.
This commit is contained in:
Mechiel Lukkien
2025-04-11 11:45:49 +02:00
parent 8bab38eac4
commit 507ca73b96
41 changed files with 2405 additions and 1545 deletions
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9
imapclient/protocol.go
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@ -43,6 +43,7 @@ const (
CapPreview Capability = "PREVIEW" // ../rfc/8970:114
CapMultiSearch Capability = "MULTISEARCH" // ../rfc/7377:187
CapNotify Capability = "NOTIFY" // ../rfc/5465:195
CapUIDOnly Capability = "UIDONLY" // ../rfc/9586:129
)
// Status is the tagged final result of a command.
@ -261,6 +262,14 @@ type UntaggedFetch struct {
Seq uint32
Attrs []FetchAttr
}
// UntaggedUIDFetch is like UntaggedFetch, but with UIDs instead of message
// sequence numbers, and returned instead of regular fetch responses when UIDONLY
// is enabled.
type UntaggedUIDFetch struct {
UID uint32
Attrs []FetchAttr
}
type UntaggedSearch []uint32
// ../rfc/7162:1101