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implement the imap metadata extension, rfc 5464

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this allows setting per-mailbox and per-server annotations (metadata). we have
a fixed maximum for total number of annotations (1000) and their total size
(1000000 bytes). this size isn't held against the regular quota for simplicity.
we send unsolicited metadata responses when a connection is in the idle
command and a change to a metadata item is made.

we currently only implement the /private/ namespace.  we should implement the
/shared/ namespace, for mox-global metadata annotations.  only the admin should
be able to configure those, probably through the config file, cli, or admin web
interface.

for issue #290
This commit is contained in:
Mechiel Lukkien
2025-02-17 22:44:51 +01:00
parent 9dff879164
commit f30c44eddb
17 changed files with 820 additions and 41 deletions
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46
imapserver/server.go
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@ -158,12 +158,13 @@ var authFailDelay = time.Second // After authentication failure.
// QRESYNC: ../rfc/7162:1323
// STATUS=SIZE: ../rfc/8438 ../rfc/9051:8024
// QUOTA QUOTA=RES-STORAGE: ../rfc/9208:111
// METADATA: ../rfc/5464
//
// 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,
// 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 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"
const serverCapabilities = "IMAP4rev2 IMAP4rev1 ENABLE LITERAL+ IDLE SASL-IR BINARY UNSELECT UIDPLUS ESEARCH SEARCHRES MOVE UTF8=ACCEPT LIST-EXTENDED 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"
type conn struct {
cid int64
@ -227,6 +228,7 @@ const (
capUTF8Accept capability = "UTF8=ACCEPT"
capCondstore capability = "CONDSTORE"
capQresync capability = "QRESYNC"
capMetadata capability = "METADATA"
)
type lineErr struct {
@ -253,7 +255,7 @@ func stateCommands(cmds ...string) map[string]struct{} {
var (
commandsStateAny = stateCommands("capability", "noop", "logout", "id")
commandsStateNotAuthenticated = stateCommands("starttls", "authenticate", "login")
commandsStateAuthenticated = stateCommands("enable", "select", "examine", "create", "delete", "rename", "subscribe", "unsubscribe", "list", "namespace", "status", "append", "idle", "lsub", "getquotaroot", "getquota")
commandsStateAuthenticated = stateCommands("enable", "select", "examine", "create", "delete", "rename", "subscribe", "unsubscribe", "list", "namespace", "status", "append", "idle", "lsub", "getquotaroot", "getquota", "getmetadata", "setmetadata")
commandsStateSelected = stateCommands("close", "unselect", "expunge", "search", "fetch", "store", "copy", "move", "uid expunge", "uid search", "uid fetch", "uid store", "uid copy", "uid move")
)
@ -286,6 +288,8 @@ var commands = map[string]func(c *conn, tag, cmd string, p *parser){
"idle": (*conn).cmdIdle,
"getquotaroot": (*conn).cmdGetquotaroot,
"getquota": (*conn).cmdGetquota,
"getmetadata": (*conn).cmdGetmetadata,
"setmetadata": (*conn).cmdSetmetadata,
// Selected.
"check": (*conn).cmdCheck,
@ -617,7 +621,7 @@ func (c *conn) readCommand(tag *string) (cmd string, p *parser) {
return cmd, newParser(p.remainder(), c)
}
func (c *conn) xreadliteral(size int64, sync bool) string {
func (c *conn) xreadliteral(size int64, sync bool) []byte {
if sync {
c.writelinef("+ ")
}
@ -633,7 +637,7 @@ func (c *conn) xreadliteral(size int64, sync bool) string {
panic(fmt.Errorf("reading literal: %s (%w)", err, errIO))
}
}
return string(buf)
return buf
}
func (c *conn) xhighestModSeq(tx *bstore.Tx, mailboxID int64) store.ModSeq {
@ -1541,6 +1545,14 @@ func (c *conn) applyChanges(changes []store.Change, initial bool) {
case store.ChangeRemoveMailbox, store.ChangeAddMailbox, store.ChangeRenameMailbox, store.ChangeAddSubscription:
n = append(n, change)
continue
case store.ChangeAnnotation:
// note: annotations may have a mailbox associated with them, but we pass all
// changes on.
// Only when the metadata capability was enabled. ../rfc/5464:660
if c.enabled[capMetadata] {
n = append(n, change)
continue
}
case store.ChangeMailboxCounts, store.ChangeMailboxSpecialUse, store.ChangeMailboxKeywords, store.ChangeThread:
default:
panic(fmt.Errorf("missing case for %#v", change))
@ -1651,6 +1663,9 @@ func (c *conn) applyChanges(changes []store.Change, initial bool) {
c.bwritelinef(`* LIST (%s) "/" %s%s`, strings.Join(ch.Flags, " "), astring(c.encodeMailbox(ch.NewName)).pack(c), oldname)
case store.ChangeAddSubscription:
c.bwritelinef(`* LIST (%s) "/" %s`, strings.Join(append([]string{`\Subscribed`}, ch.Flags...), " "), astring(c.encodeMailbox(ch.Name)).pack(c))
case store.ChangeAnnotation:
// ../rfc/5464:807 ../rfc/5464:788
c.bwritelinef(`* METADATA %s %s`, astring(c.encodeMailbox(ch.MailboxName)).pack(c), astring(ch.Key).pack(c))
default:
panic(fmt.Sprintf("internal error, missing case for %#v", change))
}
@ -2325,6 +2340,9 @@ func (c *conn) cmdEnable(tag, cmd string, p *parser) {
c.enabled[cap] = true
enabled += " " + s
qresync = true
case capMetadata:
c.enabled[cap] = true
enabled += " " + s
}
}
// QRESYNC enabled CONDSTORE too ../rfc/7162:1391
@ -2713,7 +2731,7 @@ func (c *conn) cmdCreate(tag, cmd string, p *parser) {
c.ok(tag, cmd)
}
// Delete removes a mailbox and all its messages.
// Delete removes a mailbox and all its messages and annotations.
// Inbox cannot be removed.
//
// State: Authenticated and selected.
@ -2760,7 +2778,8 @@ func (c *conn) cmdDelete(tag, cmd string, p *parser) {
}
// Rename changes the name of a mailbox.
// Renaming INBOX is special, it moves the inbox messages to a new mailbox, leaving inbox empty.
// Renaming INBOX is special, it moves the inbox messages to a new mailbox, leaving
// inbox empty, but copying metadata annotations.
// Renaming a mailbox with submailboxes also renames all submailboxes.
// Subscriptions stay with the old name, though newly created missing parent
// mailboxes for the destination name are automatically subscribed.
@ -2865,10 +2884,25 @@ func (c *conn) cmdRename(tag, cmd string, p *parser) {
if tx.Get(&store.Subscription{Name: dstMB.Name}) == nil {
dstFlags = []string{`\Subscribed`}
}
// Copy any annotations. ../rfc/5464:368
annotations, err := bstore.QueryTx[store.Annotation](tx).FilterNonzero(store.Annotation{MailboxID: srcMB.ID}).List()
xcheckf(err, "get annotations to copy for inbox")
for i := range annotations {
annotations[i].ID = 0
annotations[i].MailboxID = dstMB.ID
err := tx.Insert(&annotations[i])
xcheckf(err, "copy annotation to destination mailbox")
}
changes[0] = store.ChangeRemoveUIDs{MailboxID: srcMB.ID, UIDs: oldUIDs, ModSeq: modseq}
changes[1] = store.ChangeAddMailbox{Mailbox: dstMB, Flags: dstFlags}
// changes[2:...] are ChangeAddUIDs
changes = append(changes, srcMB.ChangeCounts(), dstMB.ChangeCounts())
for _, a := range annotations {
changes = append(changes, a.Change(dstMB.Name))
}
return
}