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
29 for my $mod (qw(Email::Address::XS Mail::Address)) {
30 eval "require $mod" or next;
31 $Address = $mod and last;
33 die "neither Email::Address::XS nor Mail::Address loaded: $@" if !$Address;
35 sub LINE_MAX () { 8000 } # RFC 2683 3.2.1.5
37 # changing this will cause grief for clients which cache
38 sub UID_BLOCK () { 50_000 }
40 # these values area also used for sorting
41 sub NEED_SMSG () { 1 }
42 sub NEED_BLOB () { NEED_SMSG|2 }
43 sub NEED_EML () { NEED_BLOB|4 }
44 my $OP_EML_NEW = [ NEED_EML - 1, \&op_eml_new ];
47 'BODY[HEADER]' => [ NEED_EML, \&emit_rfc822_header ],
48 'BODY[TEXT]' => [ NEED_EML, \&emit_rfc822_text ],
49 'BODY[]' => [ NEED_BLOB, \&emit_rfc822 ],
50 'RFC822.HEADER' => [ NEED_EML, \&emit_rfc822_header ],
51 'RFC822.TEXT' => [ NEED_EML, \&emit_rfc822_text ],
52 'RFC822.SIZE' => [ NEED_SMSG, \&emit_rfc822_size ],
53 RFC822 => [ NEED_BLOB, \&emit_rfc822 ],
54 BODY => [ NEED_EML, \&emit_body ],
55 BODYSTRUCTURE => [ NEED_EML, \&emit_bodystructure ],
56 ENVELOPE => [ NEED_EML, \&emit_envelope ],
57 FLAGS => [ 0, \&emit_flags ],
58 INTERNALDATE => [ NEED_SMSG, \&emit_internaldate ],
60 my %FETCH_ATT = map { $_ => [ $_ ] } keys %FETCH_NEED;
62 # aliases (RFC 3501 section 6.4.5)
63 $FETCH_ATT{FAST} = [ qw(FLAGS INTERNALDATE RFC822.SIZE) ];
64 $FETCH_ATT{ALL} = [ @{$FETCH_ATT{FAST}}, 'ENVELOPE' ];
65 $FETCH_ATT{FULL} = [ @{$FETCH_ATT{ALL}}, 'BODY' ];
67 for my $att (keys %FETCH_ATT) {
68 my %h = map { $_ => $FETCH_NEED{$_} } @{$FETCH_ATT{$att}};
69 $FETCH_ATT{$att} = \%h;
73 my $valid_range = '[0-9]+|[0-9]+:[0-9]+|[0-9]+:\*';
74 $valid_range = qr/\A(?:$valid_range)(?:,(?:$valid_range))*\z/;
76 my @MoY = qw(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec);
80 # RFC 3501 5.4. Autologout Timer needs to be >= 30min
81 $PublicInbox::DS::EXPTIME = 60 * 30;
85 my $capa = capa($self);
86 $self->write(\"* OK [$capa] public-inbox-imapd ready\r\n");
90 my ($class, $sock, $imapd) = @_;
91 my $self = fields::new('PublicInbox::IMAP_preauth');
95 if ($sock->can('accept_SSL') && !$sock->accept_SSL) {
96 return CORE::close($sock) if $! != EAGAIN;
97 $ev = PublicInbox::TLS::epollbit();
98 $wbuf = [ \&PublicInbox::DS::accept_tls_step, \&greet ];
100 $self->SUPER::new($sock, $ev | EPOLLONESHOT);
101 $self->{imapd} = $imapd;
103 $self->{wbuf} = $wbuf;
107 $self->update_idle_time;
116 # dovecot advertises IDLE pre-login; perhaps because some clients
117 # depend on it, so we'll do the same
118 my $capa = 'CAPABILITY IMAP4rev1 IDLE';
119 if ($self->logged_in) {
120 $capa .= ' COMPRESS=DEFLATE';
122 if (!($self->{sock} // $self)->can('accept_SSL') &&
123 $self->{imapd}->{accept_tls}) {
124 $capa .= ' STARTTLS';
126 $capa .= ' AUTH=ANONYMOUS';
130 sub login_success ($$) {
131 my ($self, $tag) = @_;
132 bless $self, 'PublicInbox::IMAP';
133 my $capa = capa($self);
134 "$tag OK [$capa] Logged in\r\n";
137 sub auth_challenge_ok ($) {
139 my $tag = delete($self->{-login_tag}) or return;
140 login_success($self, $tag);
143 sub cmd_login ($$$$) {
144 my ($self, $tag) = @_; # ignore ($user, $password) = ($_[2], $_[3])
145 login_success($self, $tag);
149 my ($self, $tag) = @_;
150 delete $self->{uid_base};
151 delete $self->{ibx} ? "$tag OK Close done\r\n"
152 : "$tag BAD No mailbox\r\n";
155 sub cmd_logout ($$) {
156 my ($self, $tag) = @_;
157 delete $self->{-idle_tag};
158 $self->write(\"* BYE logging out\r\n$tag OK Logout done\r\n");
159 $self->shutdn; # PublicInbox::DS::shutdn
163 sub cmd_authenticate ($$$) {
164 my ($self, $tag) = @_; # $method = $_[2], should be "ANONYMOUS"
165 $self->{-login_tag} = $tag;
169 sub cmd_capability ($$) {
170 my ($self, $tag) = @_;
171 '* '.capa($self)."\r\n$tag OK Capability done\r\n";
174 sub cmd_noop ($$) { "$_[1] OK Noop done\r\n" }
176 # called by PublicInbox::InboxIdle
177 sub on_inbox_unlock {
178 my ($self, $ibx) = @_;
179 my $new = $ibx->mm->max;
180 my $uid_base = $self->{uid_base} // 0;
181 my $uid_end = $uid_base + UID_BLOCK;
182 defined(my $old = $self->{-idle_max}) or die 'BUG: -idle_max unset';
183 $new = $uid_end if $new > $uid_end;
185 $self->{-idle_max} = $new;
188 $self->msg_more("* $_ EXISTS\r\n") for (($old + 1)..($new - 1));
189 $self->write(\"* $new EXISTS\r\n");
190 } elsif ($new == $uid_end) { # max exceeded $uid_end
191 # continue idling w/o inotify
192 delete $self->{-idle_max};
193 my $sock = $self->{sock} or return;
194 $ibx->unsubscribe_unlock(fileno($sock));
198 # called every X minute(s) or so by PublicInbox::DS::later
204 for my $i (values %$old) {
205 next if ($i->{wbuf} || !exists($i->{-idle_tag}));
206 $i->update_idle_time or next;
207 $IDLERS->{fileno($i->{sock})} = $i;
208 $i->write(\"* OK Still here\r\n");
210 $idle_timer = scalar keys %$IDLERS ?
211 PublicInbox::DS::later(\&idle_tick_all) : undef;
215 my ($self, $tag) = @_;
216 # IDLE seems allowed by dovecot w/o a mailbox selected *shrug*
217 my $ibx = $self->{ibx} or return "$tag BAD no mailbox selected\r\n";
218 $self->{-idle_tag} = $tag;
219 my $max = $ibx->mm->max // 0;
220 my $uid_end = ($self->{uid_base} // 0) + UID_BLOCK;
221 my $sock = $self->{sock} or return;
222 my $fd = fileno($sock);
223 # only do inotify on most recent slice
224 if ($max < $uid_end) {
225 $ibx->subscribe_unlock($fd, $self);
226 $self->{imapd}->idler_start;
227 $self->{-idle_max} = $max;
229 $idle_timer //= PublicInbox::DS::later(\&idle_tick_all);
230 $IDLERS->{$fd} = $self;
236 my $sock = $self->{sock} or return;
237 my $fd = fileno($sock);
238 delete $IDLERS->{$fd};
239 $ibx->unsubscribe_unlock($fd);
243 my ($self, $tag) = @_; # $tag is "DONE" (case-insensitive)
244 defined(my $idle_tag = delete $self->{-idle_tag}) or
245 return "$tag BAD not idle\r\n";
246 my $ibx = $self->{ibx} or do {
247 warn "BUG: idle_tag set w/o inbox";
248 return "$tag BAD internal bug\r\n";
250 stop_idle($self, $ibx);
251 "$idle_tag OK Idle done\r\n";
254 sub ensure_ranges_exist ($$$) {
255 my ($imapd, $ibx, $max) = @_;
256 defined(my $mb_top = $ibx->{newsgroup}) or return;
257 my $mailboxes = $imapd->{mailboxes};
259 for (my $i = int($max/UID_BLOCK); $i >= 0; --$i) {
260 my $sub_mailbox = "$mb_top.$i";
261 last if exists $mailboxes->{$sub_mailbox};
262 $mailboxes->{$sub_mailbox} = $ibx;
263 $sub_mailbox =~ s/\Ainbox\./INBOX./i; # more familiar to users
264 push @created, $sub_mailbox;
266 return unless @created;
267 my $l = $imapd->{inboxlist} or return;
268 push @$l, map { qq[* LIST (\\HasNoChildren) "." $_\r\n] } @created;
271 sub inbox_lookup ($$) {
272 my ($self, $mailbox) = @_;
273 my ($ibx, $exists, $uidnext);
274 if ($mailbox =~ /\A(.+)\.([0-9]+)\z/) {
275 # old mail: inbox.comp.foo.$uid_block_idx
276 my ($mb_top, $uid_base) = ($1, $2 * UID_BLOCK);
278 $ibx = $self->{imapd}->{mailboxes}->{lc $mailbox} or return;
279 $exists = $ibx->mm->max // 0;
280 $self->{uid_base} = $uid_base;
281 ensure_ranges_exist($self->{imapd}, $ibx, $exists);
282 my $uid_end = $uid_base + UID_BLOCK;
283 $exists = $uid_end if $exists > $uid_end;
284 $uidnext = $exists + 1;
285 $exists -= $uid_base;
286 } else { # check for dummy inboxes
287 $ibx = $self->{imapd}->{mailboxes}->{lc $mailbox} or return;
288 delete $self->{uid_base};
292 ($ibx, $exists, $uidnext);
295 sub cmd_examine ($$$) {
296 my ($self, $tag, $mailbox) = @_;
297 my ($ibx, $exists, $uidnext) = inbox_lookup($self, $mailbox);
298 return "$tag NO Mailbox doesn't exist: $mailbox\r\n" if !$ibx;
300 # XXX: do we need this? RFC 5162/7162
301 my $ret = $self->{ibx} ? "* OK [CLOSED] previous closed\r\n" : '';
307 * OK [PERMANENTFLAGS ()] Read-only mailbox\r
308 * OK [UNSEEN $exists]\r
309 * OK [UIDNEXT $uidnext]\r
310 * OK [UIDVALIDITY $ibx->{uidvalidity}]\r
311 $tag OK [READ-ONLY] EXAMINE/SELECT done\r
319 } elsif ($v =~ /[{"\r\n%*\\\[]/) { # literal string
320 '{' . length($v) . "}\r\n" . $v;
321 } else { # quoted string
326 sub addr_envelope ($$;$) {
327 my ($eml, $x, $y) = @_;
328 my $v = $eml->header_raw($x) //
329 ($y ? $eml->header_raw($y) : undef) // return 'NIL';
331 my @x = $Address->parse($v) or return 'NIL';
333 map { '(' . join(' ',
334 _esc($_->name), 'NIL',
335 _esc($_->user), _esc($_->host)
341 sub eml_envelope ($) {
344 _esc($eml->header_raw('Date')),
345 _esc($eml->header_raw('Subject')),
346 addr_envelope($eml, 'From'),
347 addr_envelope($eml, 'Sender', 'From'),
348 addr_envelope($eml, 'Reply-To', 'From'),
349 addr_envelope($eml, 'To'),
350 addr_envelope($eml, 'Cc'),
351 addr_envelope($eml, 'Bcc'),
352 _esc($eml->header_raw('In-Reply-To')),
353 _esc($eml->header_raw('Message-ID')),
359 if ($hash && scalar keys %$hash) {
360 $hash = [ %$hash ]; # flatten hash into 1-dimensional array
361 '(' . join(' ', map { _esc($_) } @$hash) . ')';
367 sub body_disposition ($) {
369 my $cd = $eml->header_raw('Content-Disposition') or return 'NIL';
370 $cd = parse_content_disposition($cd);
371 my $buf = '('._esc($cd->{type});
372 $buf .= ' ' . _esc_hash(delete $cd->{attributes});
376 sub body_leaf ($$;$) {
377 my ($eml, $structure, $hold) = @_;
379 $eml->{is_submsg} and # parent was a message/(rfc822|news|global)
380 $buf .= eml_envelope($eml). ' ';
382 $buf .= '('._esc($ct->{type}).' ';
383 $buf .= _esc($ct->{subtype});
384 $buf .= ' ' . _esc_hash(delete $ct->{attributes});
385 $buf .= ' ' . _esc($eml->header_raw('Content-ID'));
386 $buf .= ' ' . _esc($eml->header_raw('Content-Description'));
387 my $cte = $eml->header_raw('Content-Transfer-Encoding') // '7bit';
388 $buf .= ' ' . _esc($cte);
389 $buf .= ' ' . $eml->{imap_body_len};
390 $buf .= ' '.($eml->body_raw =~ tr/\n/\n/) if lc($ct->{type}) eq 'text';
392 # for message/(rfc822|global|news), $hold[0] should have envelope
393 $buf .= ' ' . (@$hold ? join('', @$hold) : 'NIL') if $hold;
396 $buf .= ' '._esc($eml->header_raw('Content-MD5'));
397 $buf .= ' '. body_disposition($eml);
398 $buf .= ' '._esc($eml->header_raw('Content-Language'));
399 $buf .= ' '._esc($eml->header_raw('Content-Location'));
404 sub body_parent ($$$) {
405 my ($eml, $structure, $hold) = @_;
407 my $type = lc($ct->{type});
408 if ($type eq 'multipart') {
410 $buf .= @$hold ? join('', @$hold) : 'NIL';
411 $buf .= ' '._esc($ct->{subtype});
413 $buf .= ' '._esc_hash(delete $ct->{attributes});
414 $buf .= ' '.body_disposition($eml);
415 $buf .= ' '._esc($eml->header_raw('Content-Language'));
416 $buf .= ' '._esc($eml->header_raw('Content-Location'));
420 } else { # message/(rfc822|global|news)
421 @$hold = (body_leaf($eml, $structure, $hold));
425 # this is gross, but we need to process the parent part AFTER
426 # the child parts are done
427 sub bodystructure_prep {
429 my ($eml, $depth) = @$p; # ignore idx
430 # set length here, as $eml->{bdy} gets deleted for message/rfc822
431 $eml->{imap_body_len} = length($eml->body_raw);
432 push @$q, $eml, $depth;
435 # for FETCH BODY and FETCH BODYSTRUCTURE
436 sub fetch_body ($;$) {
437 my ($eml, $structure) = @_;
439 $eml->each_part(\&bodystructure_prep, \@q, 0, 1);
443 my ($part, $depth) = splice(@q, -2);
444 my $is_mp_parent = $depth == ($cur_depth - 1);
448 body_parent($part, $structure, \@hold);
450 unshift @hold, body_leaf($part, $structure);
456 sub requeue_once ($) {
458 # COMPRESS users all share the same DEFLATE context.
459 # Flush it here to ensure clients don't see
463 # no recursion, schedule another call ASAP,
464 # but only after all pending writes are done.
466 my $new_size = push(@{$self->{wbuf}}, \&long_step);
468 # wbuf may be populated by $cb, no need to rearm if so:
469 $self->requeue if $new_size == 1;
472 # my ($uid_base, $UID) = @_;
473 sub fetch_msn_uid ($$) { '* '.($_[1] - $_[0]).' FETCH (UID '.$_[1] }
476 my ($self, $uid_base, $smsg, $bref, $ops, $partial) = @_;
477 $self->msg_more(fetch_msn_uid($uid_base, $smsg->{num}));
479 for (my $i = 0; $i < @$ops;) {
481 $ops->[$i++]->($self, $k, $smsg, $bref, $eml);
483 partial_emit($self, $partial, $eml) if $partial;
484 $self->msg_more(")\r\n");
487 sub fetch_blob_cb { # called by git->cat_async via git_async_cat
488 my ($bref, $oid, $type, $size, $fetch_arg) = @_;
489 my ($self, undef, $msgs, undef, $ops, $partial) = @$fetch_arg;
490 my $smsg = shift @$msgs or die 'BUG: no smsg';
491 if (!defined($oid)) {
492 # it's possible to have TOCTOU if an admin runs
493 # public-inbox-(edit|purge), just move onto the next message
494 return requeue_once($self);
496 $smsg->{blob} eq $oid or die "BUG: $smsg->{blob} != $oid";
498 $$bref =~ s/(?<!\r)\n/\r\n/sg; # make strict clients happy
500 # fixup old bug from import (pre-a0c07cba0e5d8b6a)
501 $$bref =~ s/\A[\r\n]*From [^\r\n]*\r\n//s;
502 fetch_run_ops($self, $self->{uid_base} // 0,
503 $smsg, $bref, $ops, $partial);
508 my ($self, $k, undef, $bref) = @_;
509 $self->msg_more(" $k {" . length($$bref)."}\r\n");
510 $self->msg_more($$bref);
513 # Mail::IMAPClient::message_string cares about this by default,
514 # (->Ignoresizeerrors attribute). Admins are encouraged to
515 # --reindex for IMAP support, anyways.
516 sub emit_rfc822_size {
517 my ($self, $k, $smsg) = @_;
518 $self->msg_more(' RFC822.SIZE ' . $smsg->{bytes});
521 sub emit_internaldate {
522 my ($self, undef, $smsg) = @_;
523 $self->msg_more(' INTERNALDATE "'.$smsg->internaldate.'"');
526 sub emit_flags { $_[0]->msg_more(' FLAGS ()') }
529 my ($self, undef, undef, undef, $eml) = @_;
530 $self->msg_more(' ENVELOPE '.eml_envelope($eml));
533 sub emit_rfc822_header {
534 my ($self, $k, undef, undef, $eml) = @_;
535 $self->msg_more(" $k {".length(${$eml->{hdr}})."}\r\n");
536 $self->msg_more(${$eml->{hdr}});
539 # n.b. this is sorted to be after any emit_eml_new ops
540 sub emit_rfc822_text {
541 my ($self, $k, undef, $bref) = @_;
542 $self->msg_more(" $k {".length($$bref)."}\r\n");
543 $self->msg_more($$bref);
546 sub emit_bodystructure {
547 my ($self, undef, undef, undef, $eml) = @_;
548 $self->msg_more(' BODYSTRUCTURE '.fetch_body($eml, 1));
552 my ($self, undef, undef, undef, $eml) = @_;
553 $self->msg_more(' BODY '.fetch_body($eml));
556 # set $eml once ($_[4] == $eml, $_[3] == $bref)
557 sub op_eml_new { $_[4] = PublicInbox::Eml->new($_[3]) }
559 sub uid_clamp ($$$) {
560 my ($self, $beg, $end) = @_;
561 my $uid_min = ($self->{uid_base} // 0) + 1;
562 my $uid_end = $uid_min + UID_BLOCK - 1;
563 $$beg = $uid_min if $$beg < $uid_min;
564 $$end = $uid_end if $$end > $uid_end;
567 sub range_step ($$) {
568 my ($self, $range_csv) = @_;
569 my ($beg, $end, $range);
570 if ($$range_csv =~ s/\A([^,]+),//) {
573 $range = $$range_csv;
576 if ($range =~ /\A([0-9]+):([0-9]+)\z/) {
577 ($beg, $end) = ($1 + 0, $2 + 0);
578 } elsif ($range =~ /\A([0-9]+):\*\z/) {
580 $end = $self->{ibx}->mm->max // 0;
581 my $uid_end = $self->{uid_base} + UID_BLOCK;
582 $end = $uid_end if $end > $uid_end;
583 $beg = $end if $beg > $end;
584 } elsif ($range =~ /\A[0-9]+\z/) {
585 $beg = $end = $range + 0;
588 return 'BAD fetch range';
590 uid_clamp($self, \$beg, \$end) if defined($range);
591 [ $beg, $end, $$range_csv ];
594 sub refill_range ($$$) {
595 my ($self, $msgs, $range_info) = @_;
596 my ($beg, $end, $range_csv) = @$range_info;
597 if (scalar(@$msgs = @{$self->{ibx}->over->query_xover($beg, $end)})) {
598 $range_info->[0] = $msgs->[-1]->{num} + 1;
601 return 'OK Fetch done' if !$range_csv;
602 my $next_range = range_step($self, \$range_csv);
603 return $next_range if !ref($next_range); # error
604 @$range_info = @$next_range;
605 undef; # keep looping
608 sub fetch_blob { # long_response
609 my ($self, $tag, $msgs, $range_info, $ops, $partial) = @_;
610 while (!@$msgs) { # rare
611 if (my $end = refill_range($self, $msgs, $range_info)) {
612 $self->write(\"$tag $end\r\n");
616 git_async_cat($self->{ibx}->git, $msgs->[0]->{blob},
617 \&fetch_blob_cb, \@_);
620 sub fetch_smsg { # long_response
621 my ($self, $tag, $msgs, $range_info, $ops) = @_;
622 while (!@$msgs) { # rare
623 if (my $end = refill_range($self, $msgs, $range_info)) {
624 $self->write(\"$tag $end\r\n");
628 my $uid_base = $self->{uid_base} // 0;
629 fetch_run_ops($self, $uid_base, $_, undef, $ops) for @$msgs;
634 sub fetch_uid { # long_response
635 my ($self, $tag, $uids, $range_info, $ops) = @_;
637 while (!@$uids) { # rare
638 my ($beg, $end, $range_csv) = @$range_info;
639 if (scalar(@$uids = @{$self->{ibx}->over->
640 uid_range($beg, $end)})) {
641 $range_info->[0] = $uids->[-1] + 1;
642 } elsif (!$range_csv) {
643 $self->write(\"$tag OK Fetch done\r\n");
646 my $next_range = range_step($self, \$range_csv);
647 if (!ref($next_range)) { # error
648 $self->write(\"$tag $next_range\r\n");
651 @$range_info = @$next_range;
655 my $uid_base = $self->{uid_base} // 0;
658 $self->msg_more(fetch_msn_uid($uid_base, $_));
659 for ($i = 0; $i < @$ops;) {
661 $ops->[$i++]->($self, $k);
663 $self->msg_more(")\r\n");
669 sub cmd_status ($$$;@) {
670 my ($self, $tag, $mailbox, @items) = @_;
671 return "$tag BAD no items\r\n" if !scalar(@items);
672 ($items[0] !~ s/\A\(//s || $items[-1] !~ s/\)\z//s) and
673 return "$tag BAD invalid args\r\n";
674 my ($ibx, $exists, $uidnext) = inbox_lookup($self, $mailbox);
675 return "$tag NO Mailbox doesn't exist: $mailbox\r\n" if !$ibx;
677 for my $it (@items) {
680 if ($it =~ /\A(?:MESSAGES|UNSEEN|RECENT)\z/) {
682 } elsif ($it eq 'UIDNEXT') {
684 } elsif ($it eq 'UIDVALIDITY') {
685 push @it, $ibx->{uidvalidity};
687 return "$tag BAD invalid item\r\n";
690 return "$tag BAD no items\r\n" if !@it;
691 "* STATUS $mailbox (".join(' ', @it).")\r\n" .
692 "$tag OK Status done\r\n";
695 my %patmap = ('*' => '.*', '%' => '[^\.]*');
696 sub cmd_list ($$$$) {
697 my ($self, $tag, $refname, $wildcard) = @_;
698 my $l = $self->{imapd}->{inboxlist};
699 if ($refname eq '' && $wildcard eq '') {
700 # request for hierarchy delimiter
701 $l = [ qq[* LIST (\\Noselect) "." ""\r\n] ];
702 } elsif ($refname ne '' || $wildcard ne '*') {
703 $wildcard =~ s!([^a-z0-9_])!$patmap{$1} // "\Q$1"!egi;
704 $l = [ grep(/ \Q$refname\E$wildcard\r\n\z/is, @$l) ];
706 \(join('', @$l, "$tag OK List done\r\n"));
709 sub cmd_lsub ($$$$) {
710 my (undef, $tag) = @_; # same args as cmd_list
711 "$tag OK Lsub done\r\n";
714 sub eml_index_offs_i { # PublicInbox::Eml::each_part callback
716 my ($eml, undef, $idx) = @$p;
717 if ($idx && lc($eml->ct->{type}) eq 'multipart') {
718 $eml->{imap_bdy} = $eml->{bdy} // \'';
720 $all->{$idx} = $eml; # $idx => Eml
723 # prepares an index for BODY[$SECTION_IDX] fetches
724 sub eml_body_idx ($$) {
725 my ($eml, $section_idx) = @_;
726 my $idx = $eml->{imap_all_parts} //= do {
728 $eml->each_part(\&eml_index_offs_i, $all, 0, 1);
729 # top-level of multipart, BODY[0] not allowed (nz-number)
733 $idx->{$section_idx};
736 # BODY[($SECTION_IDX)?(.$SECTION_NAME)?]<$offset.$bytes>
738 my ($eml, $section_idx, $section_name) = @_;
739 if (defined $section_idx) {
740 $eml = eml_body_idx($eml, $section_idx) or return;
742 if (defined $section_name) {
743 if ($section_name eq 'MIME') {
744 # RFC 3501 6.4.5 states:
745 # The MIME part specifier MUST be prefixed
746 # by one or more numeric part specifiers
747 return unless defined $section_idx;
748 return $eml->header_obj->as_string . "\r\n";
750 my $bdy = $eml->{bdy} // $eml->{imap_bdy} // \'';
751 $eml = PublicInbox::Eml->new($$bdy);
752 if ($section_name eq 'TEXT') {
753 return $eml->body_raw;
754 } elsif ($section_name eq 'HEADER') {
755 return $eml->header_obj->as_string . "\r\n";
757 die "BUG: bad section_name=$section_name";
760 ${$eml->{bdy} // $eml->{imap_bdy} // \''};
763 # similar to what's in PublicInbox::Eml::re_memo, but doesn't memoize
764 # to avoid OOM with malicious users
765 sub hdrs_regexp ($) {
767 my $names = join('|', map { "\Q$_" } split(/[ \t]+/, $hdrs));
768 qr/^(?:$names):[ \t]*[^\n]*\r?\n # 1st line
769 # continuation lines:
770 (?:[^:\n]*?[ \t]+[^\n]*\r?\n)*
774 # BODY[($SECTION_IDX.)?HEADER.FIELDS.NOT ($HDRS)]<$offset.$bytes>
775 sub partial_hdr_not {
776 my ($eml, $section_idx, $hdrs_re) = @_;
777 if (defined $section_idx) {
778 $eml = eml_body_idx($eml, $section_idx) or return;
780 my $str = $eml->header_obj->as_string;
781 $str =~ s/$hdrs_re//g;
785 # BODY[($SECTION_IDX.)?HEADER.FIELDS ($HDRS)]<$offset.$bytes>
786 sub partial_hdr_get {
787 my ($eml, $section_idx, $hdrs_re) = @_;
788 if (defined $section_idx) {
789 $eml = eml_body_idx($eml, $section_idx) or return;
791 my $str = $eml->header_obj->as_string;
792 join('', ($str =~ m/($hdrs_re)/g), "\r\n");
795 sub partial_prepare ($$$) {
796 my ($partial, $want, $att) = @_;
798 # recombine [ "BODY[1.HEADER.FIELDS", "(foo", "bar)]" ]
799 # back to: "BODY[1.HEADER.FIELDS (foo bar)]"
800 return unless $att =~ /\ABODY\[/s;
801 until (rindex($att, ']') >= 0) {
802 my $next = shift @$want or return;
803 $att .= ' ' . uc($next);
805 if ($att =~ /\ABODY\[([0-9]+(?:\.[0-9]+)*)? # 1 - section_idx
806 (?:\.(HEADER|MIME|TEXT))? # 2 - section_name
807 \](?:<([0-9]+)(?:\.([0-9]+))?>)?\z/sx) { # 3, 4
808 $partial->{$att} = [ \&partial_body, $1, $2, $3, $4 ];
809 } elsif ($att =~ /\ABODY\[(?:([0-9]+(?:\.[0-9]+)*)\.)? # 1 - section_idx
810 (?:HEADER\.FIELDS(\.NOT)?)\x20 # 2
811 \(([A-Z0-9\-\x20]+)\) # 3 - hdrs
812 \](?:<([0-9]+)(?:\.([0-9]+))?>)?\z/sx) { # 4 5
813 my $tmp = $partial->{$att} = [ $2 ? \&partial_hdr_not
816 $tmp->[2] = hdrs_regexp($3);
822 sub partial_emit ($$$) {
823 my ($self, $partial, $eml) = @_;
825 my ($k, $cb, @args) = @$_;
826 my ($offset, $len) = splice(@args, -2);
827 # $cb is partial_body|partial_hdr_get|partial_hdr_not
828 my $str = $cb->($eml, @args) // '';
829 if (defined $offset) {
831 $str = substr($str, $offset, $len);
832 $k =~ s/\.$len>\z/>/ or warn
833 "BUG: unable to remove `.$len>' from `$k'";
835 $str = substr($str, $offset);
841 $self->msg_more(" $k {$len}\r\n");
842 $self->msg_more($str);
846 sub fetch_compile ($) {
848 if ($want->[0] =~ s/\A\(//s) {
849 $want->[-1] =~ s/\)\z//s or return 'BAD no rparen';
851 my (%partial, %seen, @op);
853 while (defined(my $att = shift @$want)) {
855 next if $att eq 'UID'; # always returned
856 $att =~ s/\ABODY\.PEEK\[/BODY\[/; # we're read-only
857 my $x = $FETCH_ATT{$att};
859 while (my ($k, $fl_cb) = each %$x) {
861 $need |= $fl_cb->[0];
863 # insert a special op to convert $bref to $eml
864 # the first time we need it
865 if ($need == NEED_EML && !$seen{$need}++) {
866 push @op, $OP_EML_NEW;
868 # $fl_cb = [ flags, \&emit_foo ]
869 push @op, [ @$fl_cb , $k ];
871 } elsif (!partial_prepare(\%partial, $want, $att)) {
872 return "BAD param: $att";
877 # stabilize partial order for consistency and ease-of-debugging:
878 if (scalar keys %partial) {
880 push @op, $OP_EML_NEW if !$seen{$need}++;
881 $r[2] = [ map { [ $_, @{$partial{$_}} ] } sort keys %partial ];
884 $r[0] = $need & NEED_BLOB ? \&fetch_blob :
885 ($need & NEED_SMSG ? \&fetch_smsg : \&fetch_uid);
887 # r[1] = [ $key1, $cb1, $key2, $cb2, ... ]
888 use sort 'stable'; # makes output more consistent
889 $r[1] = [ map { ($_->[2], $_->[1]) } sort { $a->[0] <=> $b->[0] } @op ];
893 sub cmd_uid_fetch ($$$$;@) {
894 my ($self, $tag, $range_csv, @want) = @_;
895 my $ibx = $self->{ibx} or return "$tag BAD No mailbox selected\r\n";
896 my ($cb, $ops, $partial) = fetch_compile(\@want);
897 return "$tag $cb\r\n" unless $ops;
899 $range_csv = 'bad' if $range_csv !~ $valid_range;
900 my $range_info = range_step($self, \$range_csv);
901 return "$tag $range_info\r\n" if !ref($range_info);
902 long_response($self, $cb, $tag, [], $range_info, $ops, $partial);
905 sub msn_to_uid_range ($$) {
906 my $uid_base = $_[0]->{uid_base} // 0;
907 $_[1] =~ s/([0-9]+)/$uid_base + $1/sge;
910 sub cmd_fetch ($$$$;@) {
911 my ($self, $tag, $range_csv, @want) = @_;
912 my $ibx = $self->{ibx} or return "$tag BAD No mailbox selected\r\n";
913 my ($cb, $ops, $partial) = fetch_compile(\@want);
914 return "$tag $cb\r\n" unless $ops;
916 # cb is one of fetch_blob, fetch_smsg, fetch_uid
917 $range_csv = 'bad' if $range_csv !~ $valid_range;
918 msn_to_uid_range($self, $range_csv);
919 my $range_info = range_step($self, \$range_csv);
920 return "$tag $range_info\r\n" if !ref($range_info);
921 long_response($self, $cb, $tag, [], $range_info, $ops, $partial);
924 sub parse_date ($) { # 02-Oct-1993
925 my ($date_text) = @_;
926 my ($dd, $mon, $yyyy) = split(/-/, $_[0], 3);
927 defined($yyyy) or return;
928 my $mm = $MoY{$mon} // return;
929 $dd =~ /\A[0123]?[0-9]\z/ or return;
930 $yyyy =~ /\A[0-9]{4,}\z/ or return; # Y10K-compatible!
931 timegm(0, 0, 0, $dd, $mm, $yyyy);
934 sub uid_search_uid_range { # long_response
935 my ($self, $tag, $beg, $end, $sql) = @_;
936 my $uids = $self->{ibx}->over->uid_range($$beg, $end, $sql);
938 $$beg = $uids->[-1] + 1;
939 $self->msg_more(join(' ', '', @$uids));
941 $self->write(\"\r\n$tag OK Search done\r\n");
947 my ($q, $k, $d) = @_;
951 if ($k eq 'SENTON') {
952 my $end = $d + 86399; # no leap day...
953 my $da = strftime('%Y%m%d%H%M%S', gmtime($d));
954 my $db = strftime('%Y%m%d%H%M%S', gmtime($end));
955 $q->{xap} .= " dt:$da..$db";
956 $$sql .= " AND ds >= $d AND ds <= $end" if defined($sql);
957 } elsif ($k eq 'SENTBEFORE') {
958 $q->{xap} .= ' d:..'.strftime('%Y%m%d', gmtime($d));
959 $$sql .= " AND ds <= $d" if defined($sql);
960 } elsif ($k eq 'SENTSINCE') {
961 $q->{xap} .= ' d:'.strftime('%Y%m%d', gmtime($d)).'..';
962 $$sql .= " AND ds >= $d" if defined($sql);
964 # INTERNALDATE (Received)
965 } elsif ($k eq 'ON') {
966 my $end = $d + 86399; # no leap day...
967 $q->{xap} .= " ts:$d..$end";
968 $$sql .= " AND ts >= $d AND ts <= $end" if defined($sql);
969 } elsif ($k eq 'BEFORE') {
970 $q->{xap} .= " ts:..$d";
971 $$sql .= " AND ts <= $d" if defined($sql);
972 } elsif ($k eq 'SINCE') {
973 $q->{xap} .= " ts:$d..";
974 $$sql .= " AND ts >= $d" if defined($sql);
976 die "BUG: $k not recognized";
980 # IMAP to Xapian search key mapping
985 TEXT => '', # n.b. does not include all headers
988 # BCC => 'bcc:', # TODO
989 # KEYWORD # TODO ? dfpre,dfpost,...
993 my ($self, $rest) = @_;
994 if (uc($rest->[0]) eq 'CHARSET') {
996 defined(my $c = shift @$rest) or return 'BAD missing charset';
997 $c =~ /\A(?:UTF-8|US-ASCII)\z/ or return 'NO [BADCHARSET]';
1000 my $sql = ''; # date conditions, {sql} deleted if Xapian is needed
1001 my $q = { xap => '', sql => \$sql };
1003 my $k = uc(shift @$rest);
1005 next if $k =~ /\A(?:ALL|RECENT|UNSEEN|NEW)\z/;
1006 next if $k eq 'AND'; # the default, until we support OR
1007 if ($k =~ $valid_range) { # convert sequence numbers to UIDs
1008 msn_to_uid_range($self, $k);
1009 push @{$q->{uid}}, $k;
1010 } elsif ($k eq 'UID') {
1011 $k = shift(@$rest) // '';
1012 $k =~ $valid_range or return 'BAD UID range';
1013 push @{$q->{uid}}, $k;
1014 } elsif ($k =~ /\A(?:SENT)?(?:SINCE|ON|BEFORE)\z/) {
1015 my $d = parse_date(shift(@$rest) // '');
1016 defined $d or return "BAD $k date format";
1017 date_search($q, $k, $d);
1018 } elsif ($k =~ /\A(?:SMALLER|LARGER)\z/) {
1019 delete $q->{sql}; # can't use over.sqlite3
1020 my $bytes = shift(@$rest) // '';
1021 $bytes =~ /\A[0-9]+\z/ or return "BAD $k not a number";
1022 $q->{xap} .= ' bytes:' . ($k eq 'SMALLER' ?
1025 } elsif (defined(my $xk = $I2X{$k})) {
1026 delete $q->{sql}; # can't use over.sqlite3
1027 my $arg = shift @$rest;
1028 defined($arg) or return "BAD $k no arg";
1030 # Xapian can't handle [*"] in probabilistic terms
1032 $q->{xap} .= qq[ $xk:"$arg"];
1034 # TODO: parentheses, OR, NOT ...
1035 return "BAD $k not supported (yet?)";
1039 # favor using over.sqlite3 if possible, since Xapian is optional
1040 if (exists $q->{sql}) {
1042 delete($q->{sql}) if $sql eq '';
1043 } elsif (!$self->{ibx}->search) {
1044 return 'BAD Xapian not configured for mailbox';
1047 if (my $uid = $q->{uid}) {
1048 ((@$uid > 1) || $uid->[0] =~ /,/) and
1049 return 'BAD multiple ranges not supported, yet';
1050 ($q->{sql} // $q->{xap}) and
1051 return 'BAD ranges and queries do not mix, yet';
1052 $q->{uid} = join(',', @$uid); # TODO: multiple ranges
1057 sub cmd_uid_search ($$$;) {
1058 my ($self, $tag) = splice(@_, 0, 2);
1059 my $ibx = $self->{ibx} or return "$tag BAD No mailbox selected\r\n";
1060 my $q = parse_query($self, \@_);
1061 return "$tag $q\r\n" if !ref($q);
1062 my $sql = delete $q->{sql};
1064 if (!scalar(keys %$q)) {
1065 $self->msg_more('* SEARCH');
1067 my $end = $ibx->mm->max // 0;
1068 uid_clamp($self, \$beg, \$end);
1069 long_response($self, \&uid_search_uid_range,
1070 $tag, \$beg, $end, $sql);
1071 } elsif (my $uid = $q->{uid}) {
1072 if ($uid =~ /\A([0-9]+):([0-9]+|\*)\z/s) {
1073 my ($beg, $end) = ($1, $2);
1074 $end = $ibx->mm->max if $end eq '*';
1075 uid_clamp($self, \$beg, \$end);
1076 $self->msg_more('* SEARCH');
1077 long_response($self, \&uid_search_uid_range,
1078 $tag, \$beg, $end, $sql);
1079 } elsif ($uid =~ /\A[0-9]+\z/s) {
1080 $uid = $ibx->over->get_art($uid) ? " $uid" : '';
1081 "* SEARCH$uid\r\n$tag OK Search done\r\n";
1083 "$tag BAD Error\r\n";
1086 "$tag BAD Error\r\n";
1090 sub args_ok ($$) { # duplicated from PublicInbox::NNTP
1091 my ($cb, $argc) = @_;
1092 my $tot = prototype $cb;
1093 my ($nreq, undef) = split(';', $tot);
1094 $nreq = ($nreq =~ tr/$//) - 1;
1095 $tot = ($tot =~ tr/$//) - 1;
1096 ($argc <= $tot && $argc >= $nreq);
1099 # returns 1 if we can continue, 0 if not due to buffered writes or disconnect
1100 sub process_line ($$) {
1101 my ($self, $l) = @_;
1102 my ($tag, $req, @args) = parse_line('[ \t]+', 0, $l);
1103 pop(@args) if (@args && !defined($args[-1]));
1104 if (@args && uc($req) eq 'UID') {
1105 $req .= "_".(shift @args);
1108 if (my $cmd = $self->can('cmd_'.lc($req // ''))) {
1109 defined($self->{-idle_tag}) ?
1110 "$self->{-idle_tag} BAD expected DONE\r\n" :
1111 $cmd->($self, $tag, @args);
1112 } elsif (uc($tag // '') eq 'DONE' && !defined($req)) {
1113 cmd_done($self, $tag);
1114 } else { # this is weird
1115 auth_challenge_ok($self) //
1117 ' BAD Error in IMAP command '.
1119 ": Unknown command\r\n";
1123 if ($err && $self->{sock}) {
1125 err($self, 'error from: %s (%s)', $l, $err);
1127 $res = "$tag BAD program fault - command not performed\r\n";
1129 return 0 unless defined $res;
1135 # wbuf is unset or empty, here; {long} may add to it
1136 my ($fd, $cb, $t0, @args) = @{$self->{long_cb}};
1137 my $more = eval { $cb->($self, @args) };
1138 if ($@ || !$self->{sock}) { # something bad happened...
1139 delete $self->{long_cb};
1140 my $elapsed = now() - $t0;
1143 "%s during long response[$fd] - %0.6f",
1146 out($self, " deferred[$fd] aborted - %0.6f", $elapsed);
1148 } elsif ($more) { # $self->{wbuf}:
1149 $self->update_idle_time;
1151 # control passed to $more may be a GitAsyncCat object
1152 requeue_once($self) if !ref($more);
1153 } else { # all done!
1154 delete $self->{long_cb};
1155 my $elapsed = now() - $t0;
1156 my $fd = fileno($self->{sock});
1157 out($self, " deferred[$fd] done - %0.6f", $elapsed);
1158 my $wbuf = $self->{wbuf}; # do NOT autovivify
1160 $self->requeue unless $wbuf && @$wbuf;
1165 my ($self, $fmt, @args) = @_;
1166 printf { $self->{imapd}->{err} } $fmt."\n", @args;
1170 my ($self, $fmt, @args) = @_;
1171 printf { $self->{imapd}->{out} } $fmt."\n", @args;
1174 sub long_response ($$;@) {
1175 my ($self, $cb, @args) = @_; # cb returns true if more, false if done
1177 my $sock = $self->{sock} or return;
1178 # make sure we disable reading during a long response,
1179 # clients should not be sending us stuff and making us do more
1180 # work while we are stream a response to them
1181 $self->{long_cb} = [ fileno($sock), $cb, now(), @args ];
1182 long_step($self); # kick off!
1186 # callback used by PublicInbox::DS for any (e)poll (in/out/hup/err)
1190 return unless $self->flush_write && $self->{sock} && !$self->{long_cb};
1192 $self->update_idle_time;
1193 # only read more requests if we've drained the write buffer,
1194 # otherwise we can be buffering infinitely w/o backpressure
1196 my $rbuf = $self->{rbuf} // \(my $x = '');
1197 my $line = index($$rbuf, "\n");
1199 if (length($$rbuf) >= LINE_MAX) {
1200 $self->write(\"\* BAD request too long\r\n");
1201 return $self->close;
1203 $self->do_read($rbuf, LINE_MAX, length($$rbuf)) or return;
1204 $line = index($$rbuf, "\n");
1206 $line = substr($$rbuf, 0, $line + 1, '');
1207 $line =~ s/\r?\n\z//s;
1208 return $self->close if $line =~ /[[:cntrl:]]/s;
1210 my $fd = fileno($self->{sock});
1211 my $r = eval { process_line($self, $line) };
1212 my $pending = $self->{wbuf} ? ' pending' : '';
1213 out($self, "[$fd] %s - %0.6f$pending - $r", $line, now() - $t0);
1215 return $self->close if $r < 0;
1216 $self->rbuf_idle($rbuf);
1217 $self->update_idle_time;
1219 # maybe there's more pipelined data, or we'll have
1220 # to register it for socket-readiness notifications
1221 $self->requeue unless $pending;
1224 sub compressed { undef }
1226 sub zflush {} # overridden by IMAPdeflate
1229 sub cmd_compress ($$$) {
1230 my ($self, $tag, $alg) = @_;
1231 return "$tag BAD DEFLATE only\r\n" if uc($alg) ne "DEFLATE";
1232 return "$tag BAD COMPRESS active\r\n" if $self->compressed;
1234 # CRIME made TLS compression obsolete
1235 # return "$tag NO [COMPRESSIONACTIVE]\r\n" if $self->tls_compressed;
1237 PublicInbox::IMAPdeflate->enable($self, $tag);
1242 sub cmd_starttls ($$) {
1243 my ($self, $tag) = @_;
1244 my $sock = $self->{sock} or return;
1245 if ($sock->can('stop_SSL') || $self->compressed) {
1246 return "$tag BAD TLS or compression already enabled\r\n";
1248 my $opt = $self->{imapd}->{accept_tls} or
1249 return "$tag BAD can not initiate TLS negotiation\r\n";
1250 $self->write(\"$tag OK begin TLS negotiation now\r\n");
1251 $self->{sock} = IO::Socket::SSL->start_SSL($sock, %$opt);
1252 $self->requeue if PublicInbox::DS::accept_tls_step($self);
1256 # for graceful shutdown in PublicInbox::Daemon:
1258 my ($self, $now) = @_;
1259 ($self->{rbuf} || $self->{wbuf} || $self->not_idle_long($now));
1264 if (my $ibx = delete $self->{ibx}) {
1265 stop_idle($self, $ibx);
1267 $self->SUPER::close; # PublicInbox::DS::close
1270 # we're read-only, so SELECT and EXAMINE do the same thing
1272 *cmd_select = \&cmd_examine;
1274 package PublicInbox::IMAP_preauth;
1275 our @ISA = qw(PublicInbox::IMAP);