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imapserver: Make list of announced capabilities more readable.

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And merge the duplicate list of capabilities. We had each on a line for
cross-referencing with the RFC, and all capabilities again but on a single line
to use in the server greeting. Now it's just one list.
This commit is contained in:
Mechiel Lukkien 2025-03-10 11:48:10 +01:00
parent a553a107f0
commit 397fd1f5e7
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1 changed files with 41 additions and 36 deletions
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77
imapserver/server.go
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@ -136,47 +136,52 @@ func limitersInit() {
var badClientDelay = time.Second // Before reads and after 1-byte writes for probably spammers. var badClientDelay = time.Second // Before reads and after 1-byte writes for probably spammers.
var authFailDelay = time.Second // After authentication failure. var authFailDelay = time.Second // After authentication failure.
// Capabilities (extensions) the server supports. Connections will add a few more, e.g. STARTTLS, LOGINDISABLED, AUTH=PLAIN. // Capabilities (extensions) the server supports. Connections will add a few more,
// ENABLE: ../rfc/5161 // e.g. STARTTLS, LOGINDISABLED, AUTH=PLAIN.
// LITERAL+: ../rfc/7888
// IDLE: ../rfc/2177
// SASL-IR: ../rfc/4959
// BINARY: ../rfc/3516
// UNSELECT: ../rfc/3691
// UIDPLUS: ../rfc/4315
// ESEARCH: ../rfc/4731
// SEARCHRES: ../rfc/5182
// MOVE: ../rfc/6851
// UTF8=ONLY: ../rfc/6855
// LIST-EXTENDED: ../rfc/5258
// SPECIAL-USE CREATE-SPECIAL-USE: ../rfc/6154
// LIST-STATUS: ../rfc/5819
// ID: ../rfc/2971
// AUTH=EXTERNAL: ../rfc/4422:1575
// AUTH=SCRAM-SHA-256-PLUS and AUTH=SCRAM-SHA-256: ../rfc/7677 ../rfc/5802
// AUTH=SCRAM-SHA-1-PLUS and AUTH=SCRAM-SHA-1: ../rfc/5802
// AUTH=CRAM-MD5: ../rfc/2195
// APPENDLIMIT, we support the max possible size, 1<<63 - 1: ../rfc/7889:129
// CONDSTORE: ../rfc/7162:411
// QRESYNC: ../rfc/7162:1323
// STATUS=SIZE: ../rfc/8438 ../rfc/9051:8024
// QUOTA QUOTA=RES-STORAGE: ../rfc/9208:111
// METADATA: ../rfc/5464
// SAVEDATE: ../rfc/8514
// WITHIN: ../rfc/5032
// NAMESPACE: ../rfc/2342
// COMPRESS=DEFLATE: ../rfc/4978
// LIST-METADATA: ../rfc/9590
// MULTIAPPEND: ../rfc/3502
// REPLACE: ../rfc/8508
// //
// We always announce support for SCRAM PLUS-variants, also on connections without // We always announce support for SCRAM PLUS-variants, also on connections without
// TLS. The client should not be selecting PLUS variants on non-TLS connections, // 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 // instead opting to do the bare SCRAM variant without indicating the server claims
// to support the PLUS variant (skipping the server downgrade detection check). // 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 LIST-METADATA MULTIAPPEND REPLACE" var serverCapabilities = strings.Join([]string{
"IMAP4rev2", // ../rfc/9051
// disabled: COMPRESS=DEFLATE, has interoperability issues. The flate reader (inflate) still blocks on partial flushes, preventing progress. "IMAP4rev1", // ../rfc/3501
"ENABLE", // ../rfc/5161
"LITERAL+", // ../rfc/7888
"IDLE", // ../rfc/2177
"SASL-IR", // ../rfc/4959
"BINARY", // ../rfc/3516
"UNSELECT", // ../rfc/3691
"UIDPLUS", // ../rfc/4315
"ESEARCH", // ../rfc/4731
"SEARCHRES", // ../rfc/5182
"MOVE", // ../rfc/6851
"UTF8=ACCEPT", // ../rfc/6855
"LIST-EXTENDED", // ../rfc/5258
"SPECIAL-USE", // ../rfc/6154
"CREATE-SPECIAL-USE", //
"LIST-STATUS", // ../rfc/5819
"AUTH=SCRAM-SHA-256-PLUS", // ../rfc/7677 ../rfc/5802
"AUTH=SCRAM-SHA-256", //
"AUTH=SCRAM-SHA-1-PLUS", // ../rfc/5802
"AUTH=SCRAM-SHA-1", //
"AUTH=CRAM-MD5", // ../rfc/2195
"ID", // ../rfc/2971
"APPENDLIMIT=9223372036854775807", // ../rfc/7889:129, we support the max possible size, 1<<63 - 1
"CONDSTORE", // ../rfc/7162:411
"QRESYNC", // ../rfc/7162:1323
"STATUS=SIZE", // ../rfc/8438 ../rfc/9051:8024
"QUOTA", // ../rfc/9208:111
"QUOTA=RES-STORAGE", //
"METADATA", // ../rfc/5464
"SAVEDATE", // ../rfc/8514
"WITHIN", // ../rfc/5032
"NAMESPACE", // ../rfc/2342
"LIST-METADATA", // ../rfc/9590
"MULTIAPPEND", // ../rfc/3502
"REPLACE", // ../rfc/8508
// "COMPRESS=DEFLATE", // ../rfc/4978, disabled for interoperability issues: The flate reader (inflate) still blocks on partial flushes, preventing progress.
}, " ")
type conn struct { type conn struct {
cid int64 cid int64