1 # Copyright (C) 2020 all contributors <meta@public-inbox.org>
2 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
4 # Each instance of this represents an IMAP client connected to
5 # public-inbox-imapd. Much of this was taken from NNTP, but
6 # further refined while experimenting on future ideas to handle
10 # * NNTP article numbers are UIDs
12 package PublicInbox::IMAP;
14 use base qw(PublicInbox::DS);
15 use fields qw(imapd ibx long_cb -login_tag
16 uid_base -idle_tag -idle_max);
18 use PublicInbox::EmlContentFoo qw(parse_content_disposition);
19 use PublicInbox::DS qw(now);
20 use PublicInbox::Syscall qw(EPOLLIN EPOLLONESHOT);
21 use PublicInbox::GitAsyncCat;
22 use Text::ParseWords qw(parse_line);
24 use Time::Local qw(timegm);
25 use POSIX qw(strftime);
26 use Hash::Util qw(unlock_hash); # dependency of fields for perl 5.10+, anyways
27 use PublicInbox::Search;
28 *mdocid = \&PublicInbox::Search::mdocid;
31 for my $mod (qw(Email::Address::XS Mail::Address)) {
32 eval "require $mod" or next;
33 $Address = $mod and last;
35 die "neither Email::Address::XS nor Mail::Address loaded: $@" if !$Address;
37 sub LINE_MAX () { 8000 } # RFC 2683 3.2.1.5
39 # changing this will cause grief for clients which cache
40 sub UID_BLOCK () { 50_000 }
42 # these values area also used for sorting
43 sub NEED_SMSG () { 1 }
44 sub NEED_BLOB () { NEED_SMSG|2 }
45 sub CRLF_BREF () { 4 }
47 sub CRLF_HDR () { 16 }
49 sub CRLF_BDY () { 64 }
50 my $OP_EML_NEW = [ EML_HDR - 1, \&op_eml_new ];
51 my $OP_CRLF_BREF = [ CRLF_BREF, \&op_crlf_bref ];
52 my $OP_CRLF_HDR = [ CRLF_HDR, \&op_crlf_hdr ];
53 my $OP_CRLF_BDY = [ CRLF_BDY, \&op_crlf_bdy ];
56 'BODY[HEADER]' => [ NEED_BLOB|EML_HDR|CRLF_HDR, \&emit_rfc822_header ],
57 'BODY[TEXT]' => [ NEED_BLOB|EML_BDY|CRLF_BDY, \&emit_rfc822_text ],
58 'BODY[]' => [ NEED_BLOB|CRLF_BREF, \&emit_rfc822 ],
59 'RFC822.HEADER' => [ NEED_BLOB|EML_HDR|CRLF_HDR, \&emit_rfc822_header ],
60 'RFC822.TEXT' => [ NEED_BLOB|EML_BDY|CRLF_BDY, \&emit_rfc822_text ],
61 'RFC822.SIZE' => [ NEED_SMSG, \&emit_rfc822_size ],
62 RFC822 => [ NEED_BLOB|CRLF_BREF, \&emit_rfc822 ],
63 BODY => [ NEED_BLOB|EML_HDR|EML_BDY, \&emit_body ],
64 BODYSTRUCTURE => [ NEED_BLOB|EML_HDR|EML_BDY, \&emit_bodystructure ],
65 ENVELOPE => [ NEED_BLOB|EML_HDR, \&emit_envelope ],
66 FLAGS => [ 0, \&emit_flags ],
67 INTERNALDATE => [ NEED_SMSG, \&emit_internaldate ],
69 my %FETCH_ATT = map { $_ => [ $_ ] } keys %FETCH_NEED;
71 # aliases (RFC 3501 section 6.4.5)
72 $FETCH_ATT{FAST} = [ qw(FLAGS INTERNALDATE RFC822.SIZE) ];
73 $FETCH_ATT{ALL} = [ @{$FETCH_ATT{FAST}}, 'ENVELOPE' ];
74 $FETCH_ATT{FULL} = [ @{$FETCH_ATT{ALL}}, 'BODY' ];
76 for my $att (keys %FETCH_ATT) {
77 my %h = map { $_ => $FETCH_NEED{$_} } @{$FETCH_ATT{$att}};
78 $FETCH_ATT{$att} = \%h;
82 my $valid_range = '[0-9]+|[0-9]+:[0-9]+|[0-9]+:\*';
83 $valid_range = qr/\A(?:$valid_range)(?:,(?:$valid_range))*\z/;
85 my @MoY = qw(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec);
89 # RFC 3501 5.4. Autologout Timer needs to be >= 30min
90 $PublicInbox::DS::EXPTIME = 60 * 30;
94 my $capa = capa($self);
95 $self->write(\"* OK [$capa] public-inbox-imapd ready\r\n");
99 my ($class, $sock, $imapd) = @_;
100 my $self = fields::new('PublicInbox::IMAP_preauth');
104 if ($sock->can('accept_SSL') && !$sock->accept_SSL) {
105 return CORE::close($sock) if $! != EAGAIN;
106 $ev = PublicInbox::TLS::epollbit();
107 $wbuf = [ \&PublicInbox::DS::accept_tls_step, \&greet ];
109 $self->SUPER::new($sock, $ev | EPOLLONESHOT);
110 $self->{imapd} = $imapd;
112 $self->{wbuf} = $wbuf;
116 $self->update_idle_time;
125 # dovecot advertises IDLE pre-login; perhaps because some clients
126 # depend on it, so we'll do the same
127 my $capa = 'CAPABILITY IMAP4rev1 IDLE';
128 if ($self->logged_in) {
129 $capa .= ' COMPRESS=DEFLATE';
131 if (!($self->{sock} // $self)->can('accept_SSL') &&
132 $self->{imapd}->{accept_tls}) {
133 $capa .= ' STARTTLS';
135 $capa .= ' AUTH=ANONYMOUS';
139 sub login_success ($$) {
140 my ($self, $tag) = @_;
141 bless $self, 'PublicInbox::IMAP';
142 my $capa = capa($self);
143 "$tag OK [$capa] Logged in\r\n";
146 sub auth_challenge_ok ($) {
148 my $tag = delete($self->{-login_tag}) or return;
149 login_success($self, $tag);
152 sub cmd_login ($$$$) {
153 my ($self, $tag) = @_; # ignore ($user, $password) = ($_[2], $_[3])
154 login_success($self, $tag);
158 my ($self, $tag) = @_;
159 delete $self->{uid_base};
160 delete $self->{ibx} ? "$tag OK Close done\r\n"
161 : "$tag BAD No mailbox\r\n";
164 sub cmd_logout ($$) {
165 my ($self, $tag) = @_;
166 delete $self->{-idle_tag};
167 $self->write(\"* BYE logging out\r\n$tag OK Logout done\r\n");
168 $self->shutdn; # PublicInbox::DS::shutdn
172 sub cmd_authenticate ($$$) {
173 my ($self, $tag) = @_; # $method = $_[2], should be "ANONYMOUS"
174 $self->{-login_tag} = $tag;
178 sub cmd_capability ($$) {
179 my ($self, $tag) = @_;
180 '* '.capa($self)."\r\n$tag OK Capability done\r\n";
183 sub cmd_noop ($$) { "$_[1] OK Noop done\r\n" }
185 # called by PublicInbox::InboxIdle
186 sub on_inbox_unlock {
187 my ($self, $ibx) = @_;
188 my $new = $ibx->over->max;
189 my $uid_base = $self->{uid_base} // 0;
190 my $uid_end = $uid_base + UID_BLOCK;
191 defined(my $old = $self->{-idle_max}) or die 'BUG: -idle_max unset';
192 $new = $uid_end if $new > $uid_end;
194 $self->{-idle_max} = $new;
197 $self->msg_more("* $_ EXISTS\r\n") for (($old + 1)..($new - 1));
198 $self->write(\"* $new EXISTS\r\n");
199 } elsif ($new == $uid_end) { # max exceeded $uid_end
200 # continue idling w/o inotify
201 delete $self->{-idle_max};
202 my $sock = $self->{sock} or return;
203 $ibx->unsubscribe_unlock(fileno($sock));
207 # called every X minute(s) or so by PublicInbox::DS::later
213 for my $i (values %$old) {
214 next if ($i->{wbuf} || !exists($i->{-idle_tag}));
215 $i->update_idle_time or next;
216 $IDLERS->{fileno($i->{sock})} = $i;
217 $i->write(\"* OK Still here\r\n");
219 $idle_timer = scalar keys %$IDLERS ?
220 PublicInbox::DS::later(\&idle_tick_all) : undef;
224 my ($self, $tag) = @_;
225 # IDLE seems allowed by dovecot w/o a mailbox selected *shrug*
226 my $ibx = $self->{ibx} or return "$tag BAD no mailbox selected\r\n";
227 $self->{-idle_tag} = $tag;
228 my $max = $ibx->over->max;
229 my $uid_end = $self->{uid_base} + UID_BLOCK;
230 my $sock = $self->{sock} or return;
231 my $fd = fileno($sock);
232 # only do inotify on most recent slice
233 if ($max < $uid_end) {
234 $ibx->subscribe_unlock($fd, $self);
235 $self->{imapd}->idler_start;
236 $self->{-idle_max} = $max;
238 $idle_timer //= PublicInbox::DS::later(\&idle_tick_all);
239 $IDLERS->{$fd} = $self;
245 my $sock = $self->{sock} or return;
246 my $fd = fileno($sock);
247 delete $IDLERS->{$fd};
248 $ibx->unsubscribe_unlock($fd);
252 my ($self, $tag) = @_; # $tag is "DONE" (case-insensitive)
253 defined(my $idle_tag = delete $self->{-idle_tag}) or
254 return "$tag BAD not idle\r\n";
255 my $ibx = $self->{ibx} or do {
256 warn "BUG: idle_tag set w/o inbox";
257 return "$tag BAD internal bug\r\n";
259 stop_idle($self, $ibx);
260 "$idle_tag OK Idle done\r\n";
263 sub ensure_ranges_exist ($$$) {
264 my ($imapd, $ibx, $max) = @_;
265 defined(my $mb_top = $ibx->{newsgroup}) or return;
266 my $mailboxes = $imapd->{mailboxes};
268 for (my $i = int($max/UID_BLOCK); $i >= 0; --$i) {
269 my $sub_mailbox = "$mb_top.$i";
270 last if exists $mailboxes->{$sub_mailbox};
271 $mailboxes->{$sub_mailbox} = $ibx;
272 $sub_mailbox =~ s/\Ainbox\./INBOX./i; # more familiar to users
273 push @created, $sub_mailbox;
275 return unless @created;
276 my $l = $imapd->{inboxlist} or return;
277 push @$l, map { qq[* LIST (\\HasNoChildren) "." $_\r\n] } @created;
280 sub inbox_lookup ($$) {
281 my ($self, $mailbox) = @_;
282 my ($ibx, $exists, $uidnext, $uid_base);
283 if ($mailbox =~ /\A(.+)\.([0-9]+)\z/) {
284 # old mail: inbox.comp.foo.$uid_block_idx
286 $uid_base = $2 * UID_BLOCK;
287 $ibx = $self->{imapd}->{mailboxes}->{lc $mailbox} or return;
289 ($exists, $uidnext, $max) = $ibx->over->imap_status($uid_base,
290 $uid_base + UID_BLOCK);
291 ensure_ranges_exist($self->{imapd}, $ibx, $max);
292 } else { # check for dummy inboxes
293 $mailbox = lc $mailbox;
294 $ibx = $self->{imapd}->{mailboxes}->{$mailbox} or return;
296 # if "INBOX.foo.bar" is selected and "INBOX.foo.bar.0",
297 # check for new UID ranges (e.g. "INBOX.foo.bar.1")
298 if (my $z = $self->{imapd}->{mailboxes}->{"$mailbox.0"}) {
299 ensure_ranges_exist($self->{imapd}, $z, $z->over->max);
302 $uid_base = $exists = 0;
305 ($ibx, $exists, $uidnext, $uid_base);
308 sub cmd_examine ($$$) {
309 my ($self, $tag, $mailbox) = @_;
310 my ($ibx, $exists, $uidnext, $base) = inbox_lookup($self, $mailbox);
311 return "$tag NO Mailbox doesn't exist: $mailbox\r\n" if !$ibx;
312 $self->{uid_base} = $base;
314 # XXX: do we need this? RFC 5162/7162
315 my $ret = $self->{ibx} ? "* OK [CLOSED] previous closed\r\n" : '';
321 * OK [PERMANENTFLAGS ()] Read-only mailbox\r
322 * OK [UNSEEN $exists]\r
323 * OK [UIDNEXT $uidnext]\r
324 * OK [UIDVALIDITY $ibx->{uidvalidity}]\r
325 $tag OK [READ-ONLY] EXAMINE/SELECT done\r
333 } elsif ($v =~ /[{"\r\n%*\\\[]/) { # literal string
334 '{' . length($v) . "}\r\n" . $v;
335 } else { # quoted string
340 sub addr_envelope ($$;$) {
341 my ($eml, $x, $y) = @_;
342 my $v = $eml->header_raw($x) //
343 ($y ? $eml->header_raw($y) : undef) // return 'NIL';
345 my @x = $Address->parse($v) or return 'NIL';
347 map { '(' . join(' ',
348 _esc($_->name), 'NIL',
349 _esc($_->user), _esc($_->host)
355 sub eml_envelope ($) {
358 _esc($eml->header_raw('Date')),
359 _esc($eml->header_raw('Subject')),
360 addr_envelope($eml, 'From'),
361 addr_envelope($eml, 'Sender', 'From'),
362 addr_envelope($eml, 'Reply-To', 'From'),
363 addr_envelope($eml, 'To'),
364 addr_envelope($eml, 'Cc'),
365 addr_envelope($eml, 'Bcc'),
366 _esc($eml->header_raw('In-Reply-To')),
367 _esc($eml->header_raw('Message-ID')),
373 if ($hash && scalar keys %$hash) {
374 $hash = [ %$hash ]; # flatten hash into 1-dimensional array
375 '(' . join(' ', map { _esc($_) } @$hash) . ')';
381 sub body_disposition ($) {
383 my $cd = $eml->header_raw('Content-Disposition') or return 'NIL';
384 $cd = parse_content_disposition($cd);
385 my $buf = '('._esc($cd->{type});
386 $buf .= ' ' . _esc_hash(delete $cd->{attributes});
390 sub body_leaf ($$;$) {
391 my ($eml, $structure, $hold) = @_;
393 $eml->{is_submsg} and # parent was a message/(rfc822|news|global)
394 $buf .= eml_envelope($eml). ' ';
396 $buf .= '('._esc($ct->{type}).' ';
397 $buf .= _esc($ct->{subtype});
398 $buf .= ' ' . _esc_hash(delete $ct->{attributes});
399 $buf .= ' ' . _esc($eml->header_raw('Content-ID'));
400 $buf .= ' ' . _esc($eml->header_raw('Content-Description'));
401 my $cte = $eml->header_raw('Content-Transfer-Encoding') // '7bit';
402 $buf .= ' ' . _esc($cte);
403 $buf .= ' ' . $eml->{imap_body_len};
404 $buf .= ' '.($eml->body_raw =~ tr/\n/\n/) if lc($ct->{type}) eq 'text';
406 # for message/(rfc822|global|news), $hold[0] should have envelope
407 $buf .= ' ' . (@$hold ? join('', @$hold) : 'NIL') if $hold;
410 $buf .= ' '._esc($eml->header_raw('Content-MD5'));
411 $buf .= ' '. body_disposition($eml);
412 $buf .= ' '._esc($eml->header_raw('Content-Language'));
413 $buf .= ' '._esc($eml->header_raw('Content-Location'));
418 sub body_parent ($$$) {
419 my ($eml, $structure, $hold) = @_;
421 my $type = lc($ct->{type});
422 if ($type eq 'multipart') {
424 $buf .= @$hold ? join('', @$hold) : 'NIL';
425 $buf .= ' '._esc($ct->{subtype});
427 $buf .= ' '._esc_hash(delete $ct->{attributes});
428 $buf .= ' '.body_disposition($eml);
429 $buf .= ' '._esc($eml->header_raw('Content-Language'));
430 $buf .= ' '._esc($eml->header_raw('Content-Location'));
434 } else { # message/(rfc822|global|news)
435 @$hold = (body_leaf($eml, $structure, $hold));
439 # this is gross, but we need to process the parent part AFTER
440 # the child parts are done
441 sub bodystructure_prep {
443 my ($eml, $depth) = @$p; # ignore idx
444 # set length here, as $eml->{bdy} gets deleted for message/rfc822
445 $eml->{imap_body_len} = length($eml->body_raw);
446 push @$q, $eml, $depth;
449 # for FETCH BODY and FETCH BODYSTRUCTURE
450 sub fetch_body ($;$) {
451 my ($eml, $structure) = @_;
453 $eml->each_part(\&bodystructure_prep, \@q, 0, 1);
457 my ($part, $depth) = splice(@q, -2);
458 my $is_mp_parent = $depth == ($cur_depth - 1);
462 body_parent($part, $structure, \@hold);
464 unshift @hold, body_leaf($part, $structure);
470 sub requeue_once ($) {
472 # COMPRESS users all share the same DEFLATE context.
473 # Flush it here to ensure clients don't see
477 # no recursion, schedule another call ASAP,
478 # but only after all pending writes are done.
480 my $new_size = push(@{$self->{wbuf}}, \&long_step);
482 # wbuf may be populated by $cb, no need to rearm if so:
483 $self->requeue if $new_size == 1;
486 # my ($msn, $UID) = @_;
487 sub fetch_msn_uid ($$) { '* '.(${$_[0]}++).' FETCH (UID '.$_[1] }
490 my ($self, $msn, $smsg, $bref, $ops, $partial) = @_;
491 $self->msg_more(fetch_msn_uid($msn, $smsg->{num}));
493 for (my $i = 0; $i < @$ops;) {
495 $ops->[$i++]->($self, $k, $smsg, $bref, $eml);
497 partial_emit($self, $partial, $eml) if $partial;
498 $self->msg_more(")\r\n");
501 sub fetch_blob_cb { # called by git->cat_async via git_async_cat
502 my ($bref, $oid, $type, $size, $fetch_arg) = @_;
503 my ($self, undef, $msgs, $range_info, $ops, $partial) = @$fetch_arg;
504 my $smsg = shift @$msgs or die 'BUG: no smsg';
505 if (!defined($oid)) {
506 # it's possible to have TOCTOU if an admin runs
507 # public-inbox-(edit|purge), just move onto the next message
508 return requeue_once($self);
510 $smsg->{blob} eq $oid or die "BUG: $smsg->{blob} != $oid";
512 fetch_run_ops($self, $range_info->[3], $smsg, $bref, $ops, $partial);
517 my ($self, $k, undef, $bref) = @_;
518 $self->msg_more(" $k {" . length($$bref)."}\r\n");
519 $self->msg_more($$bref);
522 # Mail::IMAPClient::message_string cares about this by default,
523 # (->Ignoresizeerrors attribute). Admins are encouraged to
524 # --reindex for IMAP support, anyways.
525 sub emit_rfc822_size {
526 my ($self, $k, $smsg) = @_;
527 $self->msg_more(' RFC822.SIZE ' . $smsg->{bytes});
530 sub emit_internaldate {
531 my ($self, undef, $smsg) = @_;
532 $self->msg_more(' INTERNALDATE "'.$smsg->internaldate.'"');
535 sub emit_flags { $_[0]->msg_more(' FLAGS ()') }
538 my ($self, undef, undef, undef, $eml) = @_;
539 $self->msg_more(' ENVELOPE '.eml_envelope($eml));
542 sub emit_rfc822_header {
543 my ($self, $k, undef, undef, $eml) = @_;
544 $self->msg_more(" $k {".length(${$eml->{hdr}})."}\r\n");
545 $self->msg_more(${$eml->{hdr}});
548 # n.b. this is sorted to be after any emit_eml_new ops
549 sub emit_rfc822_text {
550 my ($self, $k, undef, $bref) = @_;
551 $self->msg_more(" $k {".length($$bref)."}\r\n");
552 $self->msg_more($$bref);
555 sub emit_bodystructure {
556 my ($self, undef, undef, undef, $eml) = @_;
557 $self->msg_more(' BODYSTRUCTURE '.fetch_body($eml, 1));
561 my ($self, undef, undef, undef, $eml) = @_;
562 $self->msg_more(' BODY '.fetch_body($eml));
565 # set $eml once ($_[4] == $eml, $_[3] == $bref)
566 sub op_eml_new { $_[4] = PublicInbox::Eml->new($_[3]) }
568 # s/From / fixes old bug from import (pre-a0c07cba0e5d8b6a)
570 ${$_[0]} =~ s/(?<!\r)\n/\r\n/sg;
571 ${$_[0]} =~ s/\A[\r\n]*From [^\r\n]*\r\n//s;
574 sub op_crlf_bref { to_crlf_full($_[3]) }
576 sub op_crlf_hdr { to_crlf_full($_[4]->{hdr}) }
578 sub op_crlf_bdy { ${$_[4]->{bdy}} =~ s/(?<!\r)\n/\r\n/sg if $_[4]->{bdy} }
580 sub uid_clamp ($$$) {
581 my ($self, $beg, $end) = @_;
582 my $uid_min = $self->{uid_base} + 1;
583 my $uid_end = $uid_min + UID_BLOCK - 1;
584 $$beg = $uid_min if $$beg < $uid_min;
585 $$end = $uid_end if $$end > $uid_end;
588 sub range_step ($$) {
589 my ($self, $range_csv) = @_;
590 my ($beg, $end, $range);
591 if ($$range_csv =~ s/\A([^,]+),//) {
594 $range = $$range_csv;
597 my $uid_base = $self->{uid_base};
598 my $uid_end = $uid_base + UID_BLOCK;
599 if ($range =~ /\A([0-9]+):([0-9]+)\z/) {
600 ($beg, $end) = ($1 + 0, $2 + 0);
601 uid_clamp($self, \$beg, \$end);
602 } elsif ($range =~ /\A([0-9]+):\*\z/) {
604 $end = $self->{ibx}->over->max;
605 $end = $uid_end if $end > $uid_end;
606 $beg = $end if $beg > $end;
607 uid_clamp($self, \$beg, \$end);
608 } elsif ($range =~ /\A[0-9]+\z/) {
609 $beg = $end = $range + 0;
610 # just let the caller do an out-of-range query if a single
611 # UID is out-of-range
612 ++$beg if ($beg <= $uid_base || $end > $uid_end);
614 return 'BAD fetch range';
616 my $msn = $beg - $uid_base;
617 [ $beg, $end, $$range_csv, \$msn ];
620 sub refill_range ($$$) {
621 my ($self, $msgs, $range_info) = @_;
622 my ($beg, $end, $range_csv) = @$range_info;
623 if (scalar(@$msgs = @{$self->{ibx}->over->query_xover($beg, $end)})) {
624 $range_info->[0] = $msgs->[-1]->{num} + 1;
627 return 'OK Fetch done' if !$range_csv;
628 my $next_range = range_step($self, \$range_csv);
629 return $next_range if !ref($next_range); # error
630 @$range_info = @$next_range;
631 undef; # keep looping
634 sub fetch_blob { # long_response
635 my ($self, $tag, $msgs, $range_info, $ops, $partial) = @_;
636 while (!@$msgs) { # rare
637 if (my $end = refill_range($self, $msgs, $range_info)) {
638 $self->write(\"$tag $end\r\n");
642 git_async_cat($self->{ibx}->git, $msgs->[0]->{blob},
643 \&fetch_blob_cb, \@_);
646 sub fetch_smsg { # long_response
647 my ($self, $tag, $msgs, $range_info, $ops) = @_;
648 while (!@$msgs) { # rare
649 if (my $end = refill_range($self, $msgs, $range_info)) {
650 $self->write(\"$tag $end\r\n");
654 fetch_run_ops($self, $range_info->[3], $_, undef, $ops) for @$msgs;
659 sub refill_uids ($$$;$) {
660 my ($self, $uids, $range_info, $sql) = @_;
661 my ($beg, $end, $range_csv) = @$range_info;
662 my $over = $self->{ibx}->over;
664 if (scalar(@$uids = @{$over->uid_range($beg, $end, $sql)})) {
665 $range_info->[0] = $uids->[-1] + 1; # update $beg
667 } elsif (!$range_csv) {
670 my $next_range = range_step($self, \$range_csv);
671 return $next_range if !ref($next_range); # error
672 ($beg, $end, $range_csv) = @$range_info = @$next_range;
678 sub fetch_uid { # long_response
679 my ($self, $tag, $uids, $range_info, $ops) = @_;
680 if (defined(my $err = refill_uids($self, $uids, $range_info))) {
681 $err ||= 'OK Fetch done';
682 $self->write("$tag $err\r\n");
686 my $msn = $range_info->[3];
688 $self->msg_more(fetch_msn_uid($msn, $_));
689 for ($i = 0; $i < @$ops;) {
691 $ops->[$i++]->($self, $k);
693 $self->msg_more(")\r\n");
699 sub cmd_status ($$$;@) {
700 my ($self, $tag, $mailbox, @items) = @_;
701 return "$tag BAD no items\r\n" if !scalar(@items);
702 ($items[0] !~ s/\A\(//s || $items[-1] !~ s/\)\z//s) and
703 return "$tag BAD invalid args\r\n";
704 my ($ibx, $exists, $uidnext) = inbox_lookup($self, $mailbox);
705 return "$tag NO Mailbox doesn't exist: $mailbox\r\n" if !$ibx;
707 for my $it (@items) {
710 if ($it =~ /\A(?:MESSAGES|UNSEEN|RECENT)\z/) {
712 } elsif ($it eq 'UIDNEXT') {
714 } elsif ($it eq 'UIDVALIDITY') {
715 push @it, $ibx->{uidvalidity};
717 return "$tag BAD invalid item\r\n";
720 return "$tag BAD no items\r\n" if !@it;
721 "* STATUS $mailbox (".join(' ', @it).")\r\n" .
722 "$tag OK Status done\r\n";
725 my %patmap = ('*' => '.*', '%' => '[^\.]*');
726 sub cmd_list ($$$$) {
727 my ($self, $tag, $refname, $wildcard) = @_;
728 my $l = $self->{imapd}->{inboxlist};
729 if ($refname eq '' && $wildcard eq '') {
730 # request for hierarchy delimiter
731 $l = [ qq[* LIST (\\Noselect) "." ""\r\n] ];
732 } elsif ($refname ne '' || $wildcard ne '*') {
733 $wildcard =~ s!([^a-z0-9_])!$patmap{$1} // "\Q$1"!egi;
734 $l = [ grep(/ \Q$refname\E$wildcard\r\n\z/is, @$l) ];
736 \(join('', @$l, "$tag OK List done\r\n"));
739 sub cmd_lsub ($$$$) {
740 my (undef, $tag) = @_; # same args as cmd_list
741 "$tag OK Lsub done\r\n";
744 sub eml_index_offs_i { # PublicInbox::Eml::each_part callback
746 my ($eml, undef, $idx) = @$p;
747 if ($idx && lc($eml->ct->{type}) eq 'multipart') {
748 $eml->{imap_bdy} = $eml->{bdy} // \'';
750 $all->{$idx} = $eml; # $idx => Eml
753 # prepares an index for BODY[$SECTION_IDX] fetches
754 sub eml_body_idx ($$) {
755 my ($eml, $section_idx) = @_;
756 my $idx = $eml->{imap_all_parts} //= do {
758 $eml->each_part(\&eml_index_offs_i, $all, 0, 1);
759 # top-level of multipart, BODY[0] not allowed (nz-number)
763 $idx->{$section_idx};
766 # BODY[($SECTION_IDX)?(.$SECTION_NAME)?]<$offset.$bytes>
768 my ($eml, $section_idx, $section_name) = @_;
769 if (defined $section_idx) {
770 $eml = eml_body_idx($eml, $section_idx) or return;
772 if (defined $section_name) {
773 if ($section_name eq 'MIME') {
774 # RFC 3501 6.4.5 states:
775 # The MIME part specifier MUST be prefixed
776 # by one or more numeric part specifiers
777 return unless defined $section_idx;
778 return $eml->header_obj->as_string . "\r\n";
780 my $bdy = $eml->{bdy} // $eml->{imap_bdy} // \'';
781 $eml = PublicInbox::Eml->new($$bdy);
782 if ($section_name eq 'TEXT') {
783 return $eml->body_raw;
784 } elsif ($section_name eq 'HEADER') {
785 return $eml->header_obj->as_string . "\r\n";
787 die "BUG: bad section_name=$section_name";
790 ${$eml->{bdy} // $eml->{imap_bdy} // \''};
793 # similar to what's in PublicInbox::Eml::re_memo, but doesn't memoize
794 # to avoid OOM with malicious users
795 sub hdrs_regexp ($) {
797 my $names = join('|', map { "\Q$_" } split(/[ \t]+/, $hdrs));
798 qr/^(?:$names):[ \t]*[^\n]*\r?\n # 1st line
799 # continuation lines:
800 (?:[^:\n]*?[ \t]+[^\n]*\r?\n)*
804 # BODY[($SECTION_IDX.)?HEADER.FIELDS.NOT ($HDRS)]<$offset.$bytes>
805 sub partial_hdr_not {
806 my ($eml, $section_idx, $hdrs_re) = @_;
807 if (defined $section_idx) {
808 $eml = eml_body_idx($eml, $section_idx) or return;
810 my $str = $eml->header_obj->as_string;
811 $str =~ s/$hdrs_re//g;
812 $str =~ s/(?<!\r)\n/\r\n/sg;
816 # BODY[($SECTION_IDX.)?HEADER.FIELDS ($HDRS)]<$offset.$bytes>
817 sub partial_hdr_get {
818 my ($eml, $section_idx, $hdrs_re) = @_;
819 if (defined $section_idx) {
820 $eml = eml_body_idx($eml, $section_idx) or return;
822 my $str = $eml->header_obj->as_string;
823 $str = join('', ($str =~ m/($hdrs_re)/g));
824 $str =~ s/(?<!\r)\n/\r\n/sg;
828 sub partial_prepare ($$$$) {
829 my ($need, $partial, $want, $att) = @_;
831 # recombine [ "BODY[1.HEADER.FIELDS", "(foo", "bar)]" ]
832 # back to: "BODY[1.HEADER.FIELDS (foo bar)]"
833 return unless $att =~ /\ABODY\[/s;
834 until (rindex($att, ']') >= 0) {
835 my $next = shift @$want or return;
836 $att .= ' ' . uc($next);
838 if ($att =~ /\ABODY\[([0-9]+(?:\.[0-9]+)*)? # 1 - section_idx
839 (?:\.(HEADER|MIME|TEXT))? # 2 - section_name
840 \](?:<([0-9]+)(?:\.([0-9]+))?>)?\z/sx) { # 3, 4
841 $partial->{$att} = [ \&partial_body, $1, $2, $3, $4 ];
842 $$need |= CRLF_BREF|EML_HDR|EML_BDY;
843 } elsif ($att =~ /\ABODY\[(?:([0-9]+(?:\.[0-9]+)*)\.)? # 1 - section_idx
844 (?:HEADER\.FIELDS(\.NOT)?)\x20 # 2
845 \(([A-Z0-9\-\x20]+)\) # 3 - hdrs
846 \](?:<([0-9]+)(?:\.([0-9]+))?>)?\z/sx) { # 4 5
847 my $tmp = $partial->{$att} = [ $2 ? \&partial_hdr_not
850 $tmp->[2] = hdrs_regexp($3);
852 # don't emit CRLF_HDR instruction, here, partial_hdr_*
853 # will do CRLF conversion with only the extracted result
854 # and not waste time converting lines we don't care about.
861 sub partial_emit ($$$) {
862 my ($self, $partial, $eml) = @_;
864 my ($k, $cb, @args) = @$_;
865 my ($offset, $len) = splice(@args, -2);
866 # $cb is partial_body|partial_hdr_get|partial_hdr_not
867 my $str = $cb->($eml, @args) // '';
868 if (defined $offset) {
870 $str = substr($str, $offset, $len);
871 $k =~ s/\.$len>\z/>/ or warn
872 "BUG: unable to remove `.$len>' from `$k'";
874 $str = substr($str, $offset);
880 $self->msg_more(" $k {$len}\r\n");
881 $self->msg_more($str);
885 sub fetch_compile ($) {
887 if ($want->[0] =~ s/\A\(//s) {
888 $want->[-1] =~ s/\)\z//s or return 'BAD no rparen';
890 my (%partial, %seen, @op);
892 while (defined(my $att = shift @$want)) {
894 next if $att eq 'UID'; # always returned
895 $att =~ s/\ABODY\.PEEK\[/BODY\[/; # we're read-only
896 my $x = $FETCH_ATT{$att};
898 while (my ($k, $fl_cb) = each %$x) {
900 $need |= $fl_cb->[0];
901 push @op, [ @$fl_cb, $k ];
903 } elsif (!partial_prepare(\$need, \%partial, $want, $att)) {
904 return "BAD param: $att";
909 # stabilize partial order for consistency and ease-of-debugging:
910 if (scalar keys %partial) {
912 $r[2] = [ map { [ $_, @{$partial{$_}} ] } sort keys %partial ];
915 push @op, $OP_EML_NEW if ($need & (EML_HDR|EML_BDY));
917 # do we need CRLF conversion?
918 if ($need & CRLF_BREF) {
919 push @op, $OP_CRLF_BREF;
920 } elsif (my $crlf = ($need & (CRLF_HDR|CRLF_BDY))) {
921 if ($crlf == (CRLF_HDR|CRLF_BDY)) {
922 push @op, $OP_CRLF_BREF;
923 } elsif ($need & CRLF_HDR) {
924 push @op, $OP_CRLF_HDR;
926 push @op, $OP_CRLF_BDY;
930 $r[0] = $need & NEED_BLOB ? \&fetch_blob :
931 ($need & NEED_SMSG ? \&fetch_smsg : \&fetch_uid);
933 # r[1] = [ $key1, $cb1, $key2, $cb2, ... ]
934 use sort 'stable'; # makes output more consistent
935 $r[1] = [ map { ($_->[2], $_->[1]) } sort { $a->[0] <=> $b->[0] } @op ];
939 sub cmd_uid_fetch ($$$$;@) {
940 my ($self, $tag, $range_csv, @want) = @_;
941 my $ibx = $self->{ibx} or return "$tag BAD No mailbox selected\r\n";
942 my ($cb, $ops, $partial) = fetch_compile(\@want);
943 return "$tag $cb\r\n" unless $ops;
945 $range_csv = 'bad' if $range_csv !~ $valid_range;
946 my $range_info = range_step($self, \$range_csv);
947 return "$tag $range_info\r\n" if !ref($range_info);
948 long_response($self, $cb, $tag, [], $range_info, $ops, $partial);
951 sub msn_to_uid_range ($$) {
952 my $uid_base = $_[0]->{uid_base};
953 $_[1] =~ s/([0-9]+)/$uid_base + $1/sge;
956 sub cmd_fetch ($$$$;@) {
957 my ($self, $tag, $range_csv, @want) = @_;
958 my $ibx = $self->{ibx} or return "$tag BAD No mailbox selected\r\n";
959 my ($cb, $ops, $partial) = fetch_compile(\@want);
960 return "$tag $cb\r\n" unless $ops;
962 # cb is one of fetch_blob, fetch_smsg, fetch_uid
963 $range_csv = 'bad' if $range_csv !~ $valid_range;
964 msn_to_uid_range($self, $range_csv);
965 my $range_info = range_step($self, \$range_csv);
966 return "$tag $range_info\r\n" if !ref($range_info);
967 long_response($self, $cb, $tag, [], $range_info, $ops, $partial);
970 sub parse_date ($) { # 02-Oct-1993
971 my ($date_text) = @_;
972 my ($dd, $mon, $yyyy) = split(/-/, $_[0], 3);
973 defined($yyyy) or return;
974 my $mm = $MoY{$mon} // return;
975 $dd =~ /\A[0123]?[0-9]\z/ or return;
976 $yyyy =~ /\A[0-9]{4,}\z/ or return; # Y10K-compatible!
977 timegm(0, 0, 0, $dd, $mm, $yyyy);
980 sub msn_convert ($$) {
981 my ($self, $uids) = @_;
982 my $adj = $self->{uid_base};
983 $_ -= $adj for @$uids;
986 sub search_uid_range { # long_response
987 my ($self, $tag, $sql, $range_info, $want_msn) = @_;
989 if (defined(my $err = refill_uids($self, $uids, $range_info, $sql))) {
990 $err ||= 'OK Search done';
991 $self->write("\r\n$tag $err\r\n");
994 msn_convert($self, $uids) if $want_msn;
995 $self->msg_more(join(' ', '', @$uids));
1000 my ($q, $k, $d) = @_;
1001 my $sql = $q->{sql};
1004 if ($k eq 'SENTON') {
1005 my $end = $d + 86399; # no leap day...
1006 my $da = strftime('%Y%m%d%H%M%S', gmtime($d));
1007 my $db = strftime('%Y%m%d%H%M%S', gmtime($end));
1008 $q->{xap} .= " dt:$da..$db";
1009 $$sql .= " AND ds >= $d AND ds <= $end" if defined($sql);
1010 } elsif ($k eq 'SENTBEFORE') {
1011 $q->{xap} .= ' d:..'.strftime('%Y%m%d', gmtime($d));
1012 $$sql .= " AND ds <= $d" if defined($sql);
1013 } elsif ($k eq 'SENTSINCE') {
1014 $q->{xap} .= ' d:'.strftime('%Y%m%d', gmtime($d)).'..';
1015 $$sql .= " AND ds >= $d" if defined($sql);
1017 # INTERNALDATE (Received)
1018 } elsif ($k eq 'ON') {
1019 my $end = $d + 86399; # no leap day...
1020 $q->{xap} .= " ts:$d..$end";
1021 $$sql .= " AND ts >= $d AND ts <= $end" if defined($sql);
1022 } elsif ($k eq 'BEFORE') {
1023 $q->{xap} .= " ts:..$d";
1024 $$sql .= " AND ts <= $d" if defined($sql);
1025 } elsif ($k eq 'SINCE') {
1026 $q->{xap} .= " ts:$d..";
1027 $$sql .= " AND ts >= $d" if defined($sql);
1029 die "BUG: $k not recognized";
1033 # IMAP to Xapian search key mapping
1038 TEXT => '', # n.b. does not include all headers
1041 # BCC => 'bcc:', # TODO
1042 # KEYWORD # TODO ? dfpre,dfpost,...
1045 # IMAP allows searching arbitrary headers via "HEADER $HDR_NAME $HDR_VAL"
1046 # which gets silly expensive. We only allow the headers we already index.
1047 my %H2X = (%I2X, 'MESSAGE-ID' => 'm:', 'LIST-ID' => 'l:');
1049 sub xap_append ($$$$) {
1050 my ($q, $rest, $k, $xk) = @_;
1051 delete $q->{sql}; # can't use over.sqlite3
1052 defined(my $arg = shift @$rest) or return "BAD $k no arg";
1054 # AFAIK Xapian can't handle [*"] in probabilistic terms
1056 ${$q->{xap}} .= qq[ $xk"$arg"];
1061 my ($self, $rest) = @_;
1062 if (uc($rest->[0]) eq 'CHARSET') {
1064 defined(my $c = shift @$rest) or return 'BAD missing charset';
1065 $c =~ /\A(?:UTF-8|US-ASCII)\z/ or return 'NO [BADCHARSET]';
1068 my $sql = ''; # date conditions, {sql} deleted if Xapian is needed
1070 my $q = { sql => \$sql, xap => \$xap };
1072 my $k = uc(shift @$rest);
1074 next if $k =~ /\A(?:ALL|RECENT|UNSEEN|NEW)\z/;
1075 next if $k eq 'AND'; # the default, until we support OR
1076 if ($k =~ $valid_range) { # convert sequence numbers to UIDs
1077 msn_to_uid_range($self, $k);
1078 push @{$q->{uid}}, $k;
1079 } elsif ($k eq 'UID') {
1080 $k = shift(@$rest) // '';
1081 $k =~ $valid_range or return 'BAD UID range';
1082 push @{$q->{uid}}, $k;
1083 } elsif ($k =~ /\A(?:SENT)?(?:SINCE|ON|BEFORE)\z/) {
1084 my $d = parse_date(shift(@$rest) // '');
1085 defined $d or return "BAD $k date format";
1086 date_search($q, $k, $d);
1087 } elsif ($k =~ /\A(?:SMALLER|LARGER)\z/) {
1088 delete $q->{sql}; # can't use over.sqlite3
1089 my $bytes = shift(@$rest) // '';
1090 $bytes =~ /\A[0-9]+\z/ or return "BAD $k not a number";
1091 $xap .= ' bytes:' . ($k eq 'SMALLER' ?
1094 } elsif ($k eq 'HEADER') {
1095 $k = uc(shift(@$rest) // '');
1096 my $xk = $H2X{$k} or
1097 return "BAD HEADER $k not supported";
1098 my $err = xap_append($q, $rest, $k, $xk);
1099 return $err if $err;
1100 } elsif (defined(my $xk = $I2X{$k})) {
1101 my $err = xap_append($q, $rest, $k, $xk);
1102 return $err if $err;
1104 # TODO: parentheses, OR, NOT ...
1105 return "BAD $k not supported (yet?)";
1109 # favor using over.sqlite3 if possible, since Xapian is optional
1110 if (exists $q->{sql}) {
1112 delete($q->{sql}) if $sql eq '';
1113 } elsif (!$self->{ibx}->search) {
1114 return 'BAD Xapian not configured for mailbox';
1116 my $max = $self->{ibx}->over->max;
1117 if (my $uid = delete $q->{uid}) {
1118 my $range_csv = join(',', @$uid);
1120 my $nxt = range_step($self, \$range_csv);
1121 my ($beg, $end) = @$nxt;
1123 $xap .= " uid:$beg..$end";
1124 } elsif ($beg == $end) {
1125 $sql .= " AND num = $beg";
1127 $sql .= " AND num >= $beg AND num <= $end";
1129 } while ($range_csv);
1132 uid_clamp($self, \$beg, \$max);
1133 $q->{range_info} = [ $beg, $max ];
1137 sub refill_xap ($$$$) {
1138 my ($self, $uids, $range_info, $q) = @_;
1139 my ($beg, $end) = @$range_info;
1140 my $srch = $self->{ibx}->search;
1141 my $opt = { mset => 2, limit => 1000 };
1142 my $nshard = $srch->{nshard} // 1;
1144 my $mset = $srch->query("$$q uid:$beg..$end", $opt);
1145 @$uids = map { mdocid($nshard, $_) } $mset->items;
1147 $range_info->[0] = $uids->[-1] + 1; # update $beg
1155 sub search_xap_range { # long_response
1156 my ($self, $tag, $q, $range_info, $want_msn) = @_;
1158 if (defined(my $err = refill_xap($self, $uids, $range_info, $q))) {
1159 $err ||= 'OK Search done';
1160 $self->write("\r\n$tag $err\r\n");
1163 msn_convert($self, $uids) if $want_msn;
1164 $self->msg_more(join(' ', '', @$uids));
1169 my ($self, $tag, $rest, $want_msn) = @_;
1170 my $ibx = $self->{ibx} or return "$tag BAD No mailbox selected\r\n";
1171 my $q = parse_query($self, $rest);
1172 return "$tag $q\r\n" if !ref($q);
1173 my ($sql, $range_info) = delete @$q{qw(sql range_info)};
1174 if (!scalar(keys %$q)) { # overview.sqlite3
1175 $self->msg_more('* SEARCH');
1176 long_response($self, \&search_uid_range,
1177 $tag, $sql, $range_info, $want_msn);
1178 } elsif ($q = $q->{xap}) {
1179 $self->msg_more('* SEARCH');
1180 long_response($self, \&search_xap_range,
1181 $tag, $q, $range_info, $want_msn);
1183 "$tag BAD Error\r\n";
1187 sub cmd_uid_search ($$$;) {
1188 my ($self, $tag) = splice(@_, 0, 2);
1189 search_common($self, $tag, \@_);
1192 sub cmd_search ($$$;) {
1193 my ($self, $tag) = splice(@_, 0, 2);
1194 search_common($self, $tag, \@_, 1);
1197 sub args_ok ($$) { # duplicated from PublicInbox::NNTP
1198 my ($cb, $argc) = @_;
1199 my $tot = prototype $cb;
1200 my ($nreq, undef) = split(';', $tot);
1201 $nreq = ($nreq =~ tr/$//) - 1;
1202 $tot = ($tot =~ tr/$//) - 1;
1203 ($argc <= $tot && $argc >= $nreq);
1206 # returns 1 if we can continue, 0 if not due to buffered writes or disconnect
1207 sub process_line ($$) {
1208 my ($self, $l) = @_;
1209 my ($tag, $req, @args) = parse_line('[ \t]+', 0, $l);
1210 pop(@args) if (@args && !defined($args[-1]));
1211 if (@args && uc($req) eq 'UID') {
1212 $req .= "_".(shift @args);
1215 if (my $cmd = $self->can('cmd_'.lc($req // ''))) {
1216 defined($self->{-idle_tag}) ?
1217 "$self->{-idle_tag} BAD expected DONE\r\n" :
1218 $cmd->($self, $tag, @args);
1219 } elsif (uc($tag // '') eq 'DONE' && !defined($req)) {
1220 cmd_done($self, $tag);
1221 } else { # this is weird
1222 auth_challenge_ok($self) //
1224 ' BAD Error in IMAP command '.
1226 ": Unknown command\r\n";
1230 if ($err && $self->{sock}) {
1232 err($self, 'error from: %s (%s)', $l, $err);
1234 $res = "$tag BAD program fault - command not performed\r\n";
1236 return 0 unless defined $res;
1242 # wbuf is unset or empty, here; {long} may add to it
1243 my ($fd, $cb, $t0, @args) = @{$self->{long_cb}};
1244 my $more = eval { $cb->($self, @args) };
1245 if ($@ || !$self->{sock}) { # something bad happened...
1246 delete $self->{long_cb};
1247 my $elapsed = now() - $t0;
1250 "%s during long response[$fd] - %0.6f",
1253 out($self, " deferred[$fd] aborted - %0.6f", $elapsed);
1255 } elsif ($more) { # $self->{wbuf}:
1256 $self->update_idle_time;
1258 # control passed to $more may be a GitAsyncCat object
1259 requeue_once($self) if !ref($more);
1260 } else { # all done!
1261 delete $self->{long_cb};
1262 my $elapsed = now() - $t0;
1263 my $fd = fileno($self->{sock});
1264 out($self, " deferred[$fd] done - %0.6f", $elapsed);
1265 my $wbuf = $self->{wbuf}; # do NOT autovivify
1267 $self->requeue unless $wbuf && @$wbuf;
1272 my ($self, $fmt, @args) = @_;
1273 printf { $self->{imapd}->{err} } $fmt."\n", @args;
1277 my ($self, $fmt, @args) = @_;
1278 printf { $self->{imapd}->{out} } $fmt."\n", @args;
1281 sub long_response ($$;@) {
1282 my ($self, $cb, @args) = @_; # cb returns true if more, false if done
1284 my $sock = $self->{sock} or return;
1285 # make sure we disable reading during a long response,
1286 # clients should not be sending us stuff and making us do more
1287 # work while we are stream a response to them
1288 $self->{long_cb} = [ fileno($sock), $cb, now(), @args ];
1289 long_step($self); # kick off!
1293 # callback used by PublicInbox::DS for any (e)poll (in/out/hup/err)
1297 return unless $self->flush_write && $self->{sock} && !$self->{long_cb};
1299 $self->update_idle_time;
1300 # only read more requests if we've drained the write buffer,
1301 # otherwise we can be buffering infinitely w/o backpressure
1303 my $rbuf = $self->{rbuf} // \(my $x = '');
1304 my $line = index($$rbuf, "\n");
1306 if (length($$rbuf) >= LINE_MAX) {
1307 $self->write(\"\* BAD request too long\r\n");
1308 return $self->close;
1310 $self->do_read($rbuf, LINE_MAX, length($$rbuf)) or return;
1311 $line = index($$rbuf, "\n");
1313 $line = substr($$rbuf, 0, $line + 1, '');
1314 $line =~ s/\r?\n\z//s;
1315 return $self->close if $line =~ /[[:cntrl:]]/s;
1317 my $fd = fileno($self->{sock});
1318 my $r = eval { process_line($self, $line) };
1319 my $pending = $self->{wbuf} ? ' pending' : '';
1320 out($self, "[$fd] %s - %0.6f$pending - $r", $line, now() - $t0);
1322 return $self->close if $r < 0;
1323 $self->rbuf_idle($rbuf);
1324 $self->update_idle_time;
1326 # maybe there's more pipelined data, or we'll have
1327 # to register it for socket-readiness notifications
1328 $self->requeue unless $pending;
1331 sub compressed { undef }
1333 sub zflush {} # overridden by IMAPdeflate
1336 sub cmd_compress ($$$) {
1337 my ($self, $tag, $alg) = @_;
1338 return "$tag BAD DEFLATE only\r\n" if uc($alg) ne "DEFLATE";
1339 return "$tag BAD COMPRESS active\r\n" if $self->compressed;
1341 # CRIME made TLS compression obsolete
1342 # return "$tag NO [COMPRESSIONACTIVE]\r\n" if $self->tls_compressed;
1344 PublicInbox::IMAPdeflate->enable($self, $tag);
1349 sub cmd_starttls ($$) {
1350 my ($self, $tag) = @_;
1351 my $sock = $self->{sock} or return;
1352 if ($sock->can('stop_SSL') || $self->compressed) {
1353 return "$tag BAD TLS or compression already enabled\r\n";
1355 my $opt = $self->{imapd}->{accept_tls} or
1356 return "$tag BAD can not initiate TLS negotiation\r\n";
1357 $self->write(\"$tag OK begin TLS negotiation now\r\n");
1358 $self->{sock} = IO::Socket::SSL->start_SSL($sock, %$opt);
1359 $self->requeue if PublicInbox::DS::accept_tls_step($self);
1363 # for graceful shutdown in PublicInbox::Daemon:
1365 my ($self, $now) = @_;
1366 ($self->{rbuf} || $self->{wbuf} || $self->not_idle_long($now));
1371 if (my $ibx = delete $self->{ibx}) {
1372 stop_idle($self, $ibx);
1374 $self->SUPER::close; # PublicInbox::DS::close
1377 # we're read-only, so SELECT and EXAMINE do the same thing
1379 *cmd_select = \&cmd_examine;
1381 package PublicInbox::IMAP_preauth;
1382 our @ISA = qw(PublicInbox::IMAP);