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imapserver: Disable compress=deflate extension

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It still blocks on reading partial flushes from clients, preventing progress
and eventually timing out. The flate library needs more changes to make this
work.

Connections from iOS mail sometimes timed out, not always.

The extension is simply not announced, code is still present.
This commit is contained in:
Mechiel Lukkien
2025-03-06 09:53:34 +01:00
parent e572d01341
commit f6132bdbc0
3 changed files with 4 additions and 6 deletions
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4
imapserver/server.go
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@ -174,7 +174,9 @@ var authFailDelay = time.Second // After authentication failure.
// TLS. The client should not be selecting PLUS variants on non-TLS connections,
// instead opting to do the bare SCRAM variant without indicating the server claims
// to support the PLUS variant (skipping the server downgrade detection check).
const serverCapabilities = "IMAP4rev2 IMAP4rev1 ENABLE LITERAL+ IDLE SASL-IR BINARY UNSELECT UIDPLUS ESEARCH SEARCHRES MOVE UTF8=ACCEPT LIST-EXTENDED SPECIAL-USE CREATE-SPECIAL-USE LIST-STATUS AUTH=SCRAM-SHA-256-PLUS AUTH=SCRAM-SHA-256 AUTH=SCRAM-SHA-1-PLUS AUTH=SCRAM-SHA-1 AUTH=CRAM-MD5 ID APPENDLIMIT=9223372036854775807 CONDSTORE QRESYNC STATUS=SIZE QUOTA QUOTA=RES-STORAGE METADATA SAVEDATE WITHIN NAMESPACE COMPRESS=DEFLATE LIST-METADATA MULTIAPPEND REPLACE"
const serverCapabilities = "IMAP4rev2 IMAP4rev1 ENABLE LITERAL+ IDLE SASL-IR BINARY UNSELECT UIDPLUS ESEARCH SEARCHRES MOVE UTF8=ACCEPT LIST-EXTENDED SPECIAL-USE CREATE-SPECIAL-USE LIST-STATUS AUTH=SCRAM-SHA-256-PLUS AUTH=SCRAM-SHA-256 AUTH=SCRAM-SHA-1-PLUS AUTH=SCRAM-SHA-1 AUTH=CRAM-MD5 ID APPENDLIMIT=9223372036854775807 CONDSTORE QRESYNC STATUS=SIZE QUOTA QUOTA=RES-STORAGE METADATA SAVEDATE WITHIN NAMESPACE LIST-METADATA MULTIAPPEND REPLACE"
// disabled: COMPRESS=DEFLATE, has interoperability issues. The flate reader (inflate) still blocks on partial flushes, preventing progress.
type conn struct {
cid int64