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Diffstat (limited to 'lib/PublicInbox/IMAP.pm')
| -rw-r--r-- | lib/PublicInbox/IMAP.pm | 1274 |
1 files changed, 1274 insertions, 0 deletions
diff --git a/lib/PublicInbox/IMAP.pm b/lib/PublicInbox/IMAP.pm new file mode 100644 index 00000000..b12533cb --- /dev/null +++ b/lib/PublicInbox/IMAP.pm @@ -0,0 +1,1274 @@ +# Copyright (C) all contributors <meta@public-inbox.org> +# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt> +# +# Each instance of this represents an IMAP client connected to +# public-inbox-imapd. Much of this was taken from NNTP, but +# further refined while experimenting on future ideas to handle +# slow storage. +# +# data notes: +# +# * NNTP article numbers are UIDs, mm->created_at is UIDVALIDITY +# +# * public-inboxes are sliced into mailboxes of 50K messages +# to not overload MUAs: $NEWSGROUP_NAME.$SLICE_INDEX +# Slices are similar in concept to v2 "epochs". Epochs +# are for the limitations of git clients, while slices are +# for the limitations of IMAP clients. +# +# * We also take advantage of slices being only 50K to store +# "UID offset" to message sequence number (MSN) mapping +# as a 50K uint16_t array (via pack("S*", ...)). "UID offset" +# is the offset from {uid_base} which determines the start of +# the mailbox slice. +# +# fields: +# imapd: PublicInbox::IMAPD ref +# ibx: PublicInbox::Inbox ref +# long_cb: long_response private data +# uid_base: base UID for mailbox slice (0-based) +# -login_tag: IMAP TAG for LOGIN +# -idle_tag: IMAP response tag for IDLE +# uo2m: UID-to-MSN mapping +package PublicInbox::IMAP; +use strict; +use parent qw(PublicInbox::DS); +use PublicInbox::Eml; +use PublicInbox::EmlContentFoo qw(parse_content_disposition); +use PublicInbox::DS qw(now); +use PublicInbox::GitAsyncCat; +use Text::ParseWords qw(parse_line); +use Errno qw(EAGAIN); +use PublicInbox::Address; + +sub LINE_MAX () { 8000 } # RFC 2683 3.2.1.5 + +# Changing UID_SLICE will cause grief for clients which cache. +# This also needs to be <64K: we pack it into a uint16_t +# for long_response UID (offset) => MSN mappings +sub UID_SLICE () { 50_000 } + +# these values area also used for sorting +sub NEED_SMSG () { 1 } +sub NEED_BLOB () { NEED_SMSG|2 } +sub CRLF_BREF () { 4 } +sub EML_HDR () { 8 } +sub CRLF_HDR () { 16 } +sub EML_BDY () { 32 } +sub CRLF_BDY () { 64 } +my $OP_EML_NEW = [ EML_HDR - 1, \&op_eml_new ]; +my $OP_CRLF_BREF = [ CRLF_BREF, \&op_crlf_bref ]; +my $OP_CRLF_HDR = [ CRLF_HDR, \&op_crlf_hdr ]; +my $OP_CRLF_BDY = [ CRLF_BDY, \&op_crlf_bdy ]; + +my %FETCH_NEED = ( + 'BODY[HEADER]' => [ NEED_BLOB|EML_HDR|CRLF_HDR, \&emit_rfc822_header ], + 'BODY[TEXT]' => [ NEED_BLOB|EML_BDY|CRLF_BDY, \&emit_rfc822_text ], + 'BODY[]' => [ NEED_BLOB|CRLF_BREF, \&emit_rfc822 ], + 'RFC822.HEADER' => [ NEED_BLOB|EML_HDR|CRLF_HDR, \&emit_rfc822_header ], + 'RFC822.TEXT' => [ NEED_BLOB|EML_BDY|CRLF_BDY, \&emit_rfc822_text ], + 'RFC822.SIZE' => [ NEED_SMSG, \&emit_rfc822_size ], + RFC822 => [ NEED_BLOB|CRLF_BREF, \&emit_rfc822 ], + BODY => [ NEED_BLOB|EML_HDR|EML_BDY, \&emit_body ], + BODYSTRUCTURE => [ NEED_BLOB|EML_HDR|EML_BDY, \&emit_bodystructure ], + ENVELOPE => [ NEED_BLOB|EML_HDR, \&emit_envelope ], + FLAGS => [ 0, \&emit_flags ], + INTERNALDATE => [ NEED_SMSG, \&emit_internaldate ], +); +my %FETCH_ATT = map { $_ => [ $_ ] } keys %FETCH_NEED; + +# aliases (RFC 3501 section 6.4.5) +$FETCH_ATT{FAST} = [ qw(FLAGS INTERNALDATE RFC822.SIZE) ]; +$FETCH_ATT{ALL} = [ @{$FETCH_ATT{FAST}}, 'ENVELOPE' ]; +$FETCH_ATT{FULL} = [ @{$FETCH_ATT{ALL}}, 'BODY' ]; + +for my $att (keys %FETCH_ATT) { + my %h = map { $_ => $FETCH_NEED{$_} } @{$FETCH_ATT{$att}}; + $FETCH_ATT{$att} = \%h; +} +undef %FETCH_NEED; + +my $valid_range = '[0-9]+|[0-9]+:[0-9]+|[0-9]+:\*'; +$valid_range = qr/\A(?:$valid_range)(?:,(?:$valid_range))*\z/; + +sub do_greet { + my ($self) = @_; + my $capa = capa($self); + $self->write(\"* OK [$capa] public-inbox-imapd ready\r\n"); +} + +sub new { + my (undef, $sock, $imapd) = @_; + (bless { imapd => $imapd }, 'PublicInbox::IMAP_preauth')->greet($sock) +} + +sub logged_in { 1 } + +sub capa ($) { + my ($self) = @_; + + # dovecot advertises IDLE pre-login; perhaps because some clients + # depend on it, so we'll do the same + my $capa = 'CAPABILITY IMAP4rev1 IDLE'; + if ($self->logged_in) { + $capa .= ' COMPRESS=DEFLATE'; + } else { + if (!($self->{sock} // $self)->can('accept_SSL') && + $self->{imapd}->{ssl_ctx_opt}) { + $capa .= ' STARTTLS'; + } + $capa .= ' AUTH=ANONYMOUS'; + } +} + +sub login_success ($$) { + my ($self, $tag) = @_; + bless $self, 'PublicInbox::IMAP'; + my $capa = capa($self); + "$tag OK [$capa] Logged in\r\n"; +} + +sub auth_challenge_ok ($) { + my ($self) = @_; + my $tag = delete($self->{-login_tag}) or return; + $self->{anon} = 1; + login_success($self, $tag); +} + +sub cmd_login ($$$$) { + my ($self, $tag) = @_; # ignore ($user, $password) = ($_[2], $_[3]) + login_success($self, $tag); +} + +sub cmd_close ($$) { + my ($self, $tag) = @_; + delete @$self{qw(uid_base uo2m)}; + delete $self->{ibx} ? "$tag OK Close done\r\n" + : "$tag BAD No mailbox\r\n"; +} + +sub cmd_logout ($$) { + my ($self, $tag) = @_; + delete $self->{-idle_tag}; + $self->write(\"* BYE logging out\r\n$tag OK Logout done\r\n"); + $self->shutdn; # PublicInbox::DS::shutdn + undef; +} + +sub cmd_authenticate ($$$) { + my ($self, $tag) = @_; # $method = $_[2], should be "ANONYMOUS" + $self->{-login_tag} = $tag; + "+\r\n"; # challenge +} + +sub cmd_capability ($$) { + my ($self, $tag) = @_; + '* '.capa($self)."\r\n$tag OK Capability done\r\n"; +} + +# uo2m: UID Offset to MSN, this is an arrayref by default, +# but uo2m_hibernate can compact and deduplicate it +sub uo2m_ary_new ($;$) { + my ($self, $exists) = @_; + my $ub = $self->{uid_base}; + my $uids = $self->{ibx}->over(1)->uid_range($ub + 1, $ub + UID_SLICE); + + # convert UIDs to offsets from {base} + my @tmp; # [$UID_OFFSET] => $MSN + my $msn = 0; + ++$ub; + $tmp[$_ - $ub] = ++$msn for @$uids; + $$exists = $msn if $exists; + \@tmp; +} + +# changes UID-offset-to-MSN mapping into a deduplicated scalar: +# uint16_t uo2m[UID_SLICE]. +# May be swapped out for idle clients if THP is disabled. +sub uo2m_hibernate ($) { + my ($self) = @_; + ref(my $uo2m = $self->{uo2m}) or return; + my %dedupe = ( uo2m_pack($uo2m) => undef ); + $self->{uo2m} = (keys(%dedupe))[0]; + undef; +} + +sub uo2m_last_uid ($) { + my ($self) = @_; + defined(my $uo2m = $self->{uo2m}) or die 'BUG: uo2m_last_uid w/o {uo2m}'; + (ref($uo2m) ? @$uo2m : (length($uo2m) >> 1)) + $self->{uid_base}; +} + +sub uo2m_pack ($) { + # $_[0] is an arrayref of MSNs, it may have undef gaps if there + # are gaps in the corresponding UIDs: [ msn1, msn2, undef, msn3 ] + no warnings 'uninitialized'; + pack('S*', @{$_[0]}); +} + +# extend {uo2m} to account for new messages which arrived since +# {uo2m} was created. +sub uo2m_extend ($$;$) { + my ($self, $new_uid_max) = @_; + defined(my $uo2m = $self->{uo2m}) or + return($self->{uo2m} = uo2m_ary_new($self)); + my $beg = uo2m_last_uid($self); # last UID we've learned + return $uo2m if $beg >= $new_uid_max; # fast path + + # need to extend the current range: + my $base = $self->{uid_base}; + ++$beg; + my $uids = $self->{ibx}->over(1)->uid_range($beg, $base + UID_SLICE); + return $uo2m if !scalar(@$uids); + my @tmp; # [$UID_OFFSET] => $MSN + my $write_method = $_[2] // 'msg_more'; + if (ref($uo2m)) { + my $msn = $uo2m->[-1]; + $tmp[$_ - $beg] = ++$msn for @$uids; + $self->$write_method("* $msn EXISTS\r\n"); + push @$uo2m, @tmp; + $uo2m; + } else { + my $msn = unpack('S', substr($uo2m, -2, 2)); + $tmp[$_ - $beg] = ++$msn for @$uids; + $self->$write_method("* $msn EXISTS\r\n"); + $uo2m .= uo2m_pack(\@tmp); + my %dedupe = ($uo2m => undef); + $self->{uo2m} = (keys %dedupe)[0]; + } +} + +sub cmd_noop ($$) { + my ($self, $tag) = @_; + defined($self->{uid_base}) and + uo2m_extend($self, $self->{uid_base} + UID_SLICE); + \"$tag OK Noop done\r\n"; +} + +# the flexible version which works on scalars and array refs. +# Must call uo2m_extend before this +sub uid2msn ($$) { + my ($self, $uid) = @_; + my $uo2m = $self->{uo2m}; + my $off = $uid - $self->{uid_base} - 1; + ref($uo2m) ? $uo2m->[$off] : unpack('S', substr($uo2m, $off << 1, 2)); +} + +# returns an arrayref of UIDs, so MSNs can be translated to UIDs via: +# $msn2uid->[$MSN-1] => $UID. The result of this is always ephemeral +# and does not live beyond the event loop. +sub msn2uid ($) { + my ($self) = @_; + my $base = $self->{uid_base}; + my $uo2m = uo2m_extend($self, $base + UID_SLICE); + $uo2m = [ unpack('S*', $uo2m) ] if !ref($uo2m); + + my $uo = 0; + my @msn2uid; + for my $msn (@$uo2m) { + ++$uo; + $msn2uid[$msn - 1] = $uo + $base if $msn; + } + \@msn2uid; +} + +# converts a set of message sequence numbers in requests to UIDs: +sub msn_to_uid_range ($$) { + my $msn2uid = $_[0]; + $_[1] =~ s!([0-9]+)!$msn2uid->[$1 - 1] // ($msn2uid->[-1] // 0 + 1)!sge; +} + +# called by PublicInbox::InboxIdle +sub on_inbox_unlock { + my ($self, $ibx) = @_; + my $uid_end = $self->{uid_base} + UID_SLICE; + uo2m_extend($self, $uid_end, 'write'); + my $new = uo2m_last_uid($self); + if ($new == $uid_end) { # max exceeded $uid_end + # continue idling w/o inotify + my $sock = $self->{sock} or return; + $ibx->unsubscribe_unlock(fileno($sock)); + } +} + +# called every minute or so by PublicInbox::DS::later +my $IDLERS; # fileno($obj->{sock}) => PublicInbox::IMAP +sub idle_tick_all { + my $old = $IDLERS; + $IDLERS = undef; + for my $i (values %$old) { + next if ($i->{wbuf} || !exists($i->{-idle_tag})); + $IDLERS->{fileno($i->{sock})} = $i; + $i->write(\"* OK Still here\r\n"); + } + $IDLERS and + PublicInbox::DS::add_uniq_timer('idle', 60, \&idle_tick_all); +} + +sub cmd_idle ($$) { + my ($self, $tag) = @_; + # IDLE seems allowed by dovecot w/o a mailbox selected *shrug* + my $ibx = $self->{ibx} or return "$tag BAD no mailbox selected\r\n"; + my $uid_end = $self->{uid_base} + UID_SLICE; + uo2m_extend($self, $uid_end); + my $sock = $self->{sock} or return; + my $fd = fileno($sock); + $self->{-idle_tag} = $tag; + # only do inotify on most recent slice + if ($ibx->over(1)->max < $uid_end) { + $ibx->subscribe_unlock($fd, $self); + $self->{imapd}->idler_start; + } + PublicInbox::DS::add_uniq_timer('idle', 60, \&idle_tick_all); + $IDLERS->{$fd} = $self; + \"+ idling\r\n" +} + +sub stop_idle ($$) { + my ($self, $ibx) = @_; + my $sock = $self->{sock} or return; + my $fd = fileno($sock); + delete $IDLERS->{$fd}; + $ibx->unsubscribe_unlock($fd); +} + +sub idle_done ($$) { + my ($self, $tag) = @_; # $tag is "DONE" (case-insensitive) + defined(my $idle_tag = delete $self->{-idle_tag}) or + return "$tag BAD not idle\r\n"; + my $ibx = $self->{ibx} or do { + warn "BUG: idle_tag set w/o inbox"; + return "$tag BAD internal bug\r\n"; + }; + stop_idle($self, $ibx); + "$idle_tag OK Idle done\r\n"; +} + +sub ensure_slices_exist ($$) { + my ($imapd, $ibx) = @_; + my $mb_top = $ibx->{newsgroup} // return; + my $mailboxes = $imapd->{mailboxes}; + my $list = $imapd->{mailboxlist}; # may be undef, just autoviv + noop + for (my $i = int($ibx->art_max/UID_SLICE); $i >= 0; --$i) { + my $sub_mailbox = "$mb_top.$i"; + last if exists $mailboxes->{$sub_mailbox}; + $mailboxes->{$sub_mailbox} = $ibx; + $sub_mailbox =~ s/\Ainbox\./INBOX./i; # more familiar to users + push @$list, qq[* LIST (\\HasNoChildren) "." $sub_mailbox\r\n] + } +} + +sub inbox_lookup ($$;$) { + my ($self, $mailbox, $examine) = @_; + my ($ibx, $exists, $uidmax, $uid_base) = (undef, 0, 0, 0); + $mailbox = lc $mailbox; + $ibx = $self->{imapd}->{mailboxes}->{$mailbox} or return; + my $over = $ibx->over(1); + if ($over != $ibx) { # not a dummy + $mailbox =~ /\.([0-9]+)\z/ or + die "BUG: unexpected dummy mailbox: $mailbox\n"; + $uid_base = $1 * UID_SLICE; + + $uidmax = $ibx->mm->num_highwater // 0; + if ($examine) { + $self->{uid_base} = $uid_base; + $self->{ibx} = $ibx; + $self->{uo2m} = uo2m_ary_new($self, \$exists); + } else { + my $uid_end = $uid_base + UID_SLICE; + $exists = $over->imap_exists($uid_base, $uid_end); + } + delete $ibx->{-art_max}; + ensure_slices_exist($self->{imapd}, $ibx); + } else { + if ($examine) { + $self->{uid_base} = $uid_base; + $self->{ibx} = $ibx; + delete $self->{uo2m}; + } + # if "INBOX.foo.bar" is selected and "INBOX.foo.bar.0", + # check for new UID ranges (e.g. "INBOX.foo.bar.1") + if (my $ibx = $self->{imapd}->{mailboxes}->{"$mailbox.0"}) { + delete $ibx->{-art_max}; + ensure_slices_exist($self->{imapd}, $ibx); + } + } + ($ibx, $exists, $uidmax + 1, $uid_base); +} + +sub cmd_examine ($$$) { + my ($self, $tag, $mailbox) = @_; + # XXX: do we need this? RFC 5162/7162 + my $ret = $self->{ibx} ? "* OK [CLOSED] previous closed\r\n" : ''; + my ($ibx, $exists, $uidnext, $base) = inbox_lookup($self, $mailbox, 1); + return "$tag NO Mailbox doesn't exist: $mailbox\r\n" if !$ibx; + $ret .= <<EOF; +* $exists EXISTS\r +* $exists RECENT\r +* FLAGS (\\Seen)\r +* OK [PERMANENTFLAGS ()] Read-only mailbox\r +* OK [UNSEEN $exists]\r +* OK [UIDNEXT $uidnext]\r +* OK [UIDVALIDITY $ibx->{uidvalidity}]\r +$tag OK [READ-ONLY] EXAMINE/SELECT done\r +EOF +} + +sub _esc ($) { + my ($v) = @_; + if (!defined($v)) { + 'NIL'; + } elsif ($v =~ /[{"\r\n%*\\\[]/) { # literal string + utf8::encode($v); + '{' . length($v) . "}\r\n" . $v; + } else { # quoted string + utf8::encode($v); + qq{"$v"} + } +} + +sub addr_envelope ($$;$) { + my ($eml, $x, $y) = @_; + my $v = $eml->header_raw($x) // + ($y ? $eml->header_raw($y) : undef) // return 'NIL'; + + my @x = PublicInbox::Address::objects($v) or return 'NIL'; + '(' . join('', + map { '(' . join(' ', + _esc($_->name), 'NIL', + _esc($_->user), _esc($_->host) + ) . ')' + } @x) . + ')'; +} + +sub eml_envelope ($) { + my ($eml) = @_; + '(' . join(' ', + _esc($eml->header_raw('Date')), + _esc($eml->header_raw('Subject')), + addr_envelope($eml, 'From'), + addr_envelope($eml, 'Sender', 'From'), + addr_envelope($eml, 'Reply-To', 'From'), + addr_envelope($eml, 'To'), + addr_envelope($eml, 'Cc'), + addr_envelope($eml, 'Bcc'), + _esc($eml->header_raw('In-Reply-To')), + _esc($eml->header_raw('Message-ID')), + ) . ')'; +} + +sub _esc_hash ($) { + my ($hash) = @_; + if ($hash && scalar keys %$hash) { + $hash = [ %$hash ]; # flatten hash into 1-dimensional array + '(' . join(' ', map { _esc($_) } @$hash) . ')'; + } else { + 'NIL'; + } +} + +sub body_disposition ($) { + my ($eml) = @_; + my $cd = $eml->header_raw('Content-Disposition') or return 'NIL'; + $cd = parse_content_disposition($cd); + my $buf = '('._esc($cd->{type}); + $buf .= ' ' . _esc_hash($cd->{attributes}); + $buf .= ')'; +} + +sub body_leaf ($$;$) { + my ($eml, $structure, $hold) = @_; + my $buf = ''; + $eml->{is_submsg} and # parent was a message/(rfc822|news|global) + $buf .= eml_envelope($eml). ' '; + my $ct = $eml->ct; + $buf .= '('._esc($ct->{type}).' '; + $buf .= _esc($ct->{subtype}); + $buf .= ' ' . _esc_hash($ct->{attributes}); + $buf .= ' ' . _esc($eml->header_raw('Content-ID')); + $buf .= ' ' . _esc($eml->header_raw('Content-Description')); + my $cte = $eml->header_raw('Content-Transfer-Encoding') // '7bit'; + $buf .= ' ' . _esc($cte); + $buf .= ' ' . $eml->{imap_body_len}; + $buf .= ' '.($eml->body_raw =~ tr/\n/\n/) if lc($ct->{type}) eq 'text'; + + # for message/(rfc822|global|news), $hold[0] should have envelope + $buf .= ' ' . (@$hold ? join('', @$hold) : 'NIL') if $hold; + + if ($structure) { + $buf .= ' '._esc($eml->header_raw('Content-MD5')); + $buf .= ' '. body_disposition($eml); + $buf .= ' '._esc($eml->header_raw('Content-Language')); + $buf .= ' '._esc($eml->header_raw('Content-Location')); + } + $buf .= ')'; +} + +sub body_parent ($$$) { + my ($eml, $structure, $hold) = @_; + my $ct = $eml->ct; + my $type = lc($ct->{type}); + if ($type eq 'multipart') { + my $buf = '('; + $buf .= @$hold ? join('', @$hold) : 'NIL'; + $buf .= ' '._esc($ct->{subtype}); + if ($structure) { + $buf .= ' '._esc_hash($ct->{attributes}); + $buf .= ' '.body_disposition($eml); + $buf .= ' '._esc($eml->header_raw('Content-Language')); + $buf .= ' '._esc($eml->header_raw('Content-Location')); + } + $buf .= ')'; + @$hold = ($buf); + } else { # message/(rfc822|global|news) + @$hold = (body_leaf($eml, $structure, $hold)); + } +} + +# this is gross, but we need to process the parent part AFTER +# the child parts are done +sub bodystructure_prep { + my ($p, $q) = @_; + my ($eml, $depth) = @$p; # ignore idx + # set length here, as $eml->{bdy} gets deleted for message/rfc822 + $eml->{imap_body_len} = length($eml->body_raw); + push @$q, $eml, $depth; +} + +# for FETCH BODY and FETCH BODYSTRUCTURE +sub fetch_body ($;$) { + my ($eml, $structure) = @_; + my @q; + $eml->each_part(\&bodystructure_prep, \@q, 0, 1); + my $cur_depth = 0; + my @hold; + do { + my ($part, $depth) = splice(@q, -2); + my $is_mp_parent = $depth == ($cur_depth - 1); + $cur_depth = $depth; + + if ($is_mp_parent) { + body_parent($part, $structure, \@hold); + } else { + unshift @hold, body_leaf($part, $structure); + } + } while (@q); + join('', @hold); +} + +sub fetch_run_ops { + my ($self, $smsg, $bref, $ops, $partial) = @_; + my $uid = $smsg->{num}; + $self->msg_more('* '.uid2msn($self, $uid)." FETCH (UID $uid"); + my ($eml, $k); + for (my $i = 0; $i < @$ops;) { + $k = $ops->[$i++]; + $ops->[$i++]->($self, $k, $smsg, $bref, $eml); + } + partial_emit($self, $partial, $eml) if $partial; + $self->msg_more(")\r\n"); +} + +sub requeue { # overrides PublicInbox::DS::requeue + my ($self) = @_; + if ($self->{anon}) { # AUTH=ANONYMOUS gets high priority + $self->SUPER::requeue; + } else { # low priority + push(@{$self->{imapd}->{-authed_q}}, $self) == 1 and + PublicInbox::DS::requeue($self->{imapd}); + } +} + +sub fetch_blob_cb { # called by git->cat_async via ibx_async_cat + my ($bref, $oid, $type, $size, $fetch_arg) = @_; + my ($self, undef, $msgs, $range_info, $ops, $partial) = @$fetch_arg; + my $ibx = $self->{ibx} or return $self->close; # client disconnected + my $smsg = shift @$msgs or die 'BUG: no smsg'; + if (!defined($type)) { + warn "E: git aborted on $oid / $smsg->{blob} $ibx->{inboxdir}"; + return $self->close; + } elsif ($type ne 'blob') { + # it's possible to have TOCTOU if an admin runs + # public-inbox-(edit|purge), just move onto the next message + warn "E: $smsg->{blob} $type in $ibx->{inboxdir}\n"; + return $self->requeue_once; + } + $smsg->{blob} eq $oid or die "BUG: $smsg->{blob} != $oid"; + my $pre; + ($self->{anon} && !$self->{wbuf} && $msgs->[0]) and + $pre = ibx_async_prefetch($ibx, $msgs->[0]->{blob}, + \&fetch_blob_cb, $fetch_arg); + fetch_run_ops($self, $smsg, $bref, $ops, $partial); + $pre ? $self->dflush : $self->requeue_once; +} + +sub emit_rfc822 { + my ($self, $k, undef, $bref) = @_; + $self->msg_more(" $k {" . length($$bref)."}\r\n"); + $self->msg_more($$bref); +} + +# Mail::IMAPClient::message_string cares about this by default, +# (->Ignoresizeerrors attribute). Admins are encouraged to +# --reindex for IMAP support, anyways. +sub emit_rfc822_size { + my ($self, $k, $smsg) = @_; + $self->msg_more(' RFC822.SIZE ' . $smsg->{bytes}); +} + +sub emit_internaldate { + my ($self, undef, $smsg) = @_; + $self->msg_more(' INTERNALDATE "'.$smsg->internaldate.'"'); +} + +sub emit_flags { $_[0]->msg_more(' FLAGS ()') } + +sub emit_envelope { + my ($self, undef, undef, undef, $eml) = @_; + $self->msg_more(' ENVELOPE '.eml_envelope($eml)); +} + +sub emit_rfc822_header { + my ($self, $k, undef, undef, $eml) = @_; + $self->msg_more(" $k {".length(${$eml->{hdr}})."}\r\n"); + $self->msg_more(${$eml->{hdr}}); +} + +# n.b. this is sorted to be after any emit_eml_new ops +sub emit_rfc822_text { + my ($self, $k, undef, $bref) = @_; + $self->msg_more(" $k {".length($$bref)."}\r\n"); + $self->msg_more($$bref); +} + +sub emit_bodystructure { + my ($self, undef, undef, undef, $eml) = @_; + $self->msg_more(' BODYSTRUCTURE '.fetch_body($eml, 1)); +} + +sub emit_body { + my ($self, undef, undef, undef, $eml) = @_; + $self->msg_more(' BODY '.fetch_body($eml)); +} + +# set $eml once ($_[4] == $eml, $_[3] == $bref) +sub op_eml_new { $_[4] = PublicInbox::Eml->new($_[3]) } + +# s/From / fixes old bug from import (pre-a0c07cba0e5d8b6a) +sub to_crlf_full { + ${$_[0]} =~ s/(?<!\r)\n/\r\n/sg; + PublicInbox::Eml::strip_from(${$_[0]}); +} + +sub op_crlf_bref { to_crlf_full($_[3]) } + +sub op_crlf_hdr { to_crlf_full($_[4]->{hdr}) } + +sub op_crlf_bdy { ${$_[4]->{bdy}} =~ s/(?<!\r)\n/\r\n/sg if $_[4]->{bdy} } + +sub uid_clamp ($$$) { + my ($self, $beg, $end) = @_; + my $uid_min = $self->{uid_base} + 1; + my $uid_end = $uid_min + UID_SLICE - 1; + $$beg = $uid_min if $$beg < $uid_min; + $$end = $uid_end if $$end > $uid_end; +} + +sub range_step ($$) { + my ($self, $range_csv) = @_; + my ($beg, $end, $range); + if ($$range_csv =~ s/\A([^,]+),//) { + $range = $1; + } else { + $range = $$range_csv; + $$range_csv = undef; + } + my $uid_base = $self->{uid_base}; + my $uid_end = $uid_base + UID_SLICE; + if ($range =~ /\A([0-9]+):([0-9]+)\z/) { + ($beg, $end) = ($1 + 0, $2 + 0); + uid_clamp($self, \$beg, \$end); + } elsif ($range =~ /\A([0-9]+):\*\z/) { + $beg = $1 + 0; + $end = $self->{ibx}->over(1)->max; + $end = $uid_end if $end > $uid_end; + $beg = $end if $beg > $end; + uid_clamp($self, \$beg, \$end); + } elsif ($range =~ /\A[0-9]+\z/) { + $beg = $end = $range + 0; + # just let the caller do an out-of-range query if a single + # UID is out-of-range + ++$beg if ($beg <= $uid_base || $end > $uid_end); + } else { + return 'BAD fetch range'; + } + [ $beg, $end, $$range_csv ]; +} + +sub refill_range ($$$) { + my ($self, $msgs, $range_info) = @_; + my ($beg, $end, $range_csv) = @$range_info; + if (scalar(@$msgs = @{$self->{ibx}->over(1)->query_xover($beg, $end)})){ + $range_info->[0] = $msgs->[-1]->{num} + 1; + return; + } + return 'OK Fetch done' if !$range_csv; + my $next_range = range_step($self, \$range_csv); + return $next_range if !ref($next_range); # error + @$range_info = @$next_range; + undef; # keep looping +} + +sub fetch_blob { # long_response + my ($self, $tag, $msgs, $range_info, $ops, $partial) = @_; + while (!@$msgs) { # rare + if (my $end = refill_range($self, $msgs, $range_info)) { + $self->write(\"$tag $end\r\n"); + return; + } + } + uo2m_extend($self, $msgs->[-1]->{num}); + ibx_async_cat($self->{ibx}, $msgs->[0]->{blob}, + \&fetch_blob_cb, \@_); +} + +sub fetch_smsg { # long_response + my ($self, $tag, $msgs, $range_info, $ops) = @_; + while (!@$msgs) { # rare + if (my $end = refill_range($self, $msgs, $range_info)) { + $self->write(\"$tag $end\r\n"); + return; + } + } + uo2m_extend($self, $msgs->[-1]->{num}); + fetch_run_ops($self, $_, undef, $ops) for @$msgs; + @$msgs = (); + 1; # more +} + +sub refill_uids ($$$;$) { + my ($self, $uids, $range_info, $sql) = @_; + my ($beg, $end, $range_csv) = @$range_info; + my $over = $self->{ibx}->over(1); + while (1) { + if (scalar(@$uids = @{$over->uid_range($beg, $end, $sql)})) { + $range_info->[0] = $uids->[-1] + 1; # update $beg + return; + } elsif (!$range_csv) { + return 0; + } else { + my $next_range = range_step($self, \$range_csv); + return $next_range if !ref($next_range); # error + ($beg, $end, $range_csv) = @$range_info = @$next_range; + # continue looping + } + } +} + +sub fetch_uid { # long_response + my ($self, $tag, $uids, $range_info, $ops) = @_; + if (defined(my $err = refill_uids($self, $uids, $range_info))) { + $err ||= 'OK Fetch done'; + $self->write("$tag $err\r\n"); + return; + } + my $adj = $self->{uid_base} + 1; + my $uo2m = uo2m_extend($self, $uids->[-1]); + $uo2m = [ unpack('S*', $uo2m) ] if !ref($uo2m); + my ($i, $k); + for (@$uids) { + $self->msg_more("* $uo2m->[$_ - $adj] FETCH (UID $_"); + for ($i = 0; $i < @$ops;) { + $k = $ops->[$i++]; + $ops->[$i++]->($self, $k); + } + $self->msg_more(")\r\n"); + } + @$uids = (); + 1; # more +} + +sub cmd_status ($$$;@) { + my ($self, $tag, $mailbox, @items) = @_; + return "$tag BAD no items\r\n" if !scalar(@items); + ($items[0] !~ s/\A\(//s || $items[-1] !~ s/\)\z//s) and + return "$tag BAD invalid args\r\n"; + my ($ibx, $exists, $uidnext) = inbox_lookup($self, $mailbox); + return "$tag NO Mailbox doesn't exist: $mailbox\r\n" if !$ibx; + my @it; + for my $it (@items) { + $it = uc($it); + push @it, $it; + if ($it =~ /\A(?:MESSAGES|UNSEEN|RECENT)\z/) { + push @it, $exists; + } elsif ($it eq 'UIDNEXT') { + push @it, $uidnext; + } elsif ($it eq 'UIDVALIDITY') { + push @it, $ibx->{uidvalidity}; + } else { + return "$tag BAD invalid item\r\n"; + } + } + return "$tag BAD no items\r\n" if !@it; + "* STATUS $mailbox (".join(' ', @it).")\r\n" . + "$tag OK Status done\r\n"; +} + +my %patmap = ('*' => '.*', '%' => '[^\.]*'); +sub cmd_list ($$$$) { + my ($self, $tag, $refname, $wildcard) = @_; + my $l = $self->{imapd}->{mailboxlist}; + if ($refname eq '' && $wildcard eq '') { + # request for hierarchy delimiter + $l = [ qq[* LIST (\\Noselect) "." ""\r\n] ]; + } elsif ($refname ne '' || $wildcard ne '*') { + $wildcard =~ s!([^a-z0-9_])!$patmap{$1} // "\Q$1"!egi; + $l = [ grep(/ \Q$refname\E$wildcard\r\n\z/is, @$l) ]; + } + \(join('', @$l, "$tag OK List done\r\n")); +} + +sub cmd_lsub ($$$$) { + my (undef, $tag) = @_; # same args as cmd_list + "$tag OK Lsub done\r\n"; +} + +sub eml_index_offs_i { # PublicInbox::Eml::each_part callback + my ($p, $all) = @_; + my ($eml, undef, $idx) = @$p; + if ($idx && lc($eml->ct->{type}) eq 'multipart') { + $eml->{imap_bdy} = $eml->{bdy} // \''; + } + $all->{$idx} = $eml; # $idx => Eml +} + +# prepares an index for BODY[$SECTION_IDX] fetches +sub eml_body_idx ($$) { + my ($eml, $section_idx) = @_; + my $idx = $eml->{imap_all_parts} // do { + my $all = {}; + $eml->each_part(\&eml_index_offs_i, $all, 0, 1); + # top-level of multipart, BODY[0] not allowed (nz-number) + delete $all->{0}; + $eml->{imap_all_parts} = $all; + }; + $idx->{$section_idx}; +} + +# BODY[($SECTION_IDX)?(.$SECTION_NAME)?]<$offset.$bytes> +sub partial_body { + my ($eml, $section_idx, $section_name) = @_; + if (defined $section_idx) { + $eml = eml_body_idx($eml, $section_idx) or return; + } + if (defined $section_name) { + if ($section_name eq 'MIME') { + # RFC 3501 6.4.5 states: + # The MIME part specifier MUST be prefixed + # by one or more numeric part specifiers + return unless defined $section_idx; + return $eml->header_obj->as_string . "\r\n"; + } + my $bdy = $eml->{bdy} // $eml->{imap_bdy} // \''; + $eml = PublicInbox::Eml->new($$bdy); + if ($section_name eq 'TEXT') { + return $eml->body_raw; + } elsif ($section_name eq 'HEADER') { + return $eml->header_obj->as_string . "\r\n"; + } else { + die "BUG: bad section_name=$section_name"; + } + } + ${$eml->{bdy} // $eml->{imap_bdy} // \''}; +} + +# similar to what's in PublicInbox::Eml::re_memo, but doesn't memoize +# to avoid OOM with malicious users +sub hdrs_regexp ($) { + my ($hdrs) = @_; + my $names = join('|', map { "\Q$_" } split(/[ \t]+/, $hdrs)); + qr/^(?:$names):[ \t]*[^\n]*\r?\n # 1st line + # continuation lines: + (?:[^:\n]*?[ \t]+[^\n]*\r?\n)* + /ismx; +} + +# BODY[($SECTION_IDX.)?HEADER.FIELDS.NOT ($HDRS)]<$offset.$bytes> +sub partial_hdr_not { + my ($eml, $section_idx, $hdrs_re) = @_; + if (defined $section_idx) { + $eml = eml_body_idx($eml, $section_idx) or return; + } + my $str = $eml->header_obj->as_string; + $str =~ s/$hdrs_re//g; + $str =~ s/(?<!\r)\n/\r\n/sg; + $str .= "\r\n"; +} + +# BODY[($SECTION_IDX.)?HEADER.FIELDS ($HDRS)]<$offset.$bytes> +sub partial_hdr_get { + my ($eml, $section_idx, $hdrs_re) = @_; + if (defined $section_idx) { + $eml = eml_body_idx($eml, $section_idx) or return; + } + my $str = $eml->header_obj->as_string; + $str = join('', ($str =~ m/($hdrs_re)/g)); + $str =~ s/(?<!\r)\n/\r\n/sg; + $str .= "\r\n"; +} + +sub partial_prepare ($$$$) { + my ($need, $partial, $want, $att) = @_; + + # recombine [ "BODY[1.HEADER.FIELDS", "(foo", "bar)]" ] + # back to: "BODY[1.HEADER.FIELDS (foo bar)]" + return unless $att =~ /\ABODY\[/s; + until (rindex($att, ']') >= 0) { + my $next = shift @$want or return; + $att .= ' ' . uc($next); + } + if ($att =~ /\ABODY\[([0-9]+(?:\.[0-9]+)*)? # 1 - section_idx + (?:\.(HEADER|MIME|TEXT))? # 2 - section_name + \](?:<([0-9]+)(?:\.([0-9]+))?>)?\z/sx) { # 3, 4 + $partial->{$att} = [ \&partial_body, $1, $2, $3, $4 ]; + $$need |= CRLF_BREF|EML_HDR|EML_BDY; + } elsif ($att =~ /\ABODY\[(?:([0-9]+(?:\.[0-9]+)*)\.)? # 1 - section_idx + (?:HEADER\.FIELDS(\.NOT)?)\x20 # 2 + \(([A-Z0-9\-\x20]+)\) # 3 - hdrs + \](?:<([0-9]+)(?:\.([0-9]+))?>)?\z/sx) { # 4 5 + my $tmp = $partial->{$att} = [ $2 ? \&partial_hdr_not + : \&partial_hdr_get, + $1, undef, $4, $5 ]; + $tmp->[2] = hdrs_regexp($3); + + # don't emit CRLF_HDR instruction, here, partial_hdr_* + # will do CRLF conversion with only the extracted result + # and not waste time converting lines we don't care about. + $$need |= EML_HDR; + } else { + undef; + } +} + +sub partial_emit ($$$) { + my ($self, $partial, $eml) = @_; + for (@$partial) { + my ($k, $cb, @args) = @$_; + my ($offset, $len) = splice(@args, -2); + # $cb is partial_body|partial_hdr_get|partial_hdr_not + my $str = $cb->($eml, @args) // ''; + if (defined $offset) { + if (defined $len) { + $str = substr($str, $offset, $len); + $k =~ s/\.$len>\z/>/ or warn +"BUG: unable to remove `.$len>' from `$k'"; + } else { + $str = substr($str, $offset); + $len = length($str); + } + } else { + $len = length($str); + } + $self->msg_more(" $k {$len}\r\n"); + $self->msg_more($str); + } +} + +sub fetch_compile ($) { + my ($want) = @_; + if ($want->[0] =~ s/\A\(//s) { + $want->[-1] =~ s/\)\z//s or return 'BAD no rparen'; + } + my (%partial, %seen, @op); + my $need = 0; + while (defined(my $att = shift @$want)) { + $att = uc($att); + next if $att eq 'UID'; # always returned + $att =~ s/\ABODY\.PEEK\[/BODY\[/; # we're read-only + my $x = $FETCH_ATT{$att}; + if ($x) { + while (my ($k, $fl_cb) = each %$x) { + next if $seen{$k}++; + $need |= $fl_cb->[0]; + push @op, [ @$fl_cb, $k ]; + } + } elsif (!partial_prepare(\$need, \%partial, $want, $att)) { + return "BAD param: $att"; + } + } + my @r; + + # stabilize partial order for consistency and ease-of-debugging: + if (scalar keys %partial) { + $need |= NEED_BLOB; + @{$r[2]} = map { [ $_, @{$partial{$_}} ] } sort keys %partial; + } + + push @op, $OP_EML_NEW if ($need & (EML_HDR|EML_BDY)); + + # do we need CRLF conversion? + if ($need & CRLF_BREF) { + push @op, $OP_CRLF_BREF; + } elsif (my $crlf = ($need & (CRLF_HDR|CRLF_BDY))) { + if ($crlf == (CRLF_HDR|CRLF_BDY)) { + push @op, $OP_CRLF_BREF; + } elsif ($need & CRLF_HDR) { + push @op, $OP_CRLF_HDR; + } else { + push @op, $OP_CRLF_BDY; + } + } + + $r[0] = $need & NEED_BLOB ? \&fetch_blob : + ($need & NEED_SMSG ? \&fetch_smsg : \&fetch_uid); + + # r[1] = [ $key1, $cb1, $key2, $cb2, ... ] + use sort 'stable'; # makes output more consistent + @{$r[1]} = map { ($_->[2], $_->[1]) } sort { $a->[0] <=> $b->[0] } @op; + @r; +} + +sub cmd_uid_fetch ($$$$;@) { + my ($self, $tag, $range_csv, @want) = @_; + my $ibx = $self->{ibx} or return "$tag BAD No mailbox selected\r\n"; + my ($cb, $ops, $partial) = fetch_compile(\@want); + return "$tag $cb\r\n" unless $ops; + + # cb is one of fetch_blob, fetch_smsg, fetch_uid + $range_csv = 'bad' if $range_csv !~ $valid_range; + my $range_info = range_step($self, \$range_csv); + return "$tag $range_info\r\n" if !ref($range_info); + uo2m_hibernate($self) if $cb == \&fetch_blob; # slow, save RAM + $self->long_response($cb, $tag, [], $range_info, $ops, $partial); +} + +sub cmd_fetch ($$$$;@) { + my ($self, $tag, $range_csv, @want) = @_; + my $ibx = $self->{ibx} or return "$tag BAD No mailbox selected\r\n"; + my ($cb, $ops, $partial) = fetch_compile(\@want); + return "$tag $cb\r\n" unless $ops; + + # cb is one of fetch_blob, fetch_smsg, fetch_uid + $range_csv = 'bad' if $range_csv !~ $valid_range; + msn_to_uid_range(msn2uid($self), $range_csv); + my $range_info = range_step($self, \$range_csv); + return "$tag $range_info\r\n" if !ref($range_info); + uo2m_hibernate($self) if $cb == \&fetch_blob; # slow, save RAM + $self->long_response($cb, $tag, [], $range_info, $ops, $partial); +} + +sub msn_convert ($$) { + my ($self, $uids) = @_; + my $adj = $self->{uid_base} + 1; + my $uo2m = uo2m_extend($self, $uids->[-1]); + $uo2m = [ unpack('S*', $uo2m) ] if !ref($uo2m); + $_ = $uo2m->[$_ - $adj] for @$uids; +} + +sub search_uid_range { # long_response + my ($self, $tag, $sql, $range_info, $want_msn) = @_; + my $uids = []; + if (defined(my $err = refill_uids($self, $uids, $range_info, $sql))) { + $err ||= 'OK Search done'; + $self->write("\r\n$tag $err\r\n"); + return; + } + msn_convert($self, $uids) if $want_msn; + $self->msg_more(join(' ', '', @$uids)); + 1; # more +} + +sub parse_imap_query ($$) { + my ($self, $query) = @_; + # IMAPsearchqp gets loaded in IMAPD->refresh_groups + my $q = PublicInbox::IMAPsearchqp::parse($self, $query); + if (ref($q)) { + my $max = $self->{ibx}->over(1)->max; + my $beg = 1; + uid_clamp($self, \$beg, \$max); + $q->{range_info} = [ $beg, $max ]; + } + $q; +} + +sub search_common { + my ($self, $tag, $query, $want_msn) = @_; + my $ibx = $self->{ibx} or return "$tag BAD No mailbox selected\r\n"; + my $q = parse_imap_query($self, $query); + return "$tag $q\r\n" if !ref($q); + my ($sql, $range_info) = delete @$q{qw(sql range_info)}; + if (!scalar(keys %$q)) { # overview.sqlite3 + $self->msg_more('* SEARCH'); + $self->long_response(\&search_uid_range, + $tag, $sql, $range_info, $want_msn); + } elsif ($q = $q->{xap}) { + my $srch = $self->{ibx}->isrch or + return "$tag BAD search not available for mailbox\r\n"; + my $opt = { + relevance => -1, + limit => UID_SLICE, + uid_range => $range_info + }; + my $mset = $srch->mset($q, $opt); + my $uids = $srch->mset_to_artnums($mset, $opt); + msn_convert($self, $uids) if scalar(@$uids) && $want_msn; + "* SEARCH @$uids\r\n$tag OK Search done\r\n"; + } else { + "$tag BAD Error\r\n"; + } +} + +sub cmd_uid_search ($$$) { + my ($self, $tag, $query) = @_; + search_common($self, $tag, $query); +} + +sub cmd_search ($$$;) { + my ($self, $tag, $query) = @_; + search_common($self, $tag, $query, 1); +} + +# returns 1 if we can continue, 0 if not due to buffered writes or disconnect +sub process_line ($$) { + my ($self, $l) = @_; + + # TODO: IMAP allows literals for big requests to upload messages + # (which we don't support) but maybe some big search queries use it. + # RFC 3501 9 (2) doesn't permit TAB or multiple SP + my ($tag, $req, @args) = parse_line('[ \t]+', 0, $l); + pop(@args) if (@args && !defined($args[-1])); + if (@args && uc($req) eq 'UID') { + $req .= "_".(shift @args); + } + my $res = eval { + if (defined(my $idle_tag = $self->{-idle_tag})) { + (uc($tag // '') eq 'DONE' && !defined($req)) ? + idle_done($self, $tag) : + "$idle_tag BAD expected DONE\r\n"; + } elsif (my $cmd = $self->can('cmd_'.lc($req // ''))) { + if ($cmd == \&cmd_uid_search || $cmd == \&cmd_search) { + # preserve user-supplied quotes for search + (undef, @args) = split(/ search /i, $l, 2); + } + $cmd->($self, $tag, @args); + } else { # this is weird + auth_challenge_ok($self) // + ($tag // '*') . + ' BAD Error in IMAP command '. + ($req // '(???)'). + ": Unknown command\r\n"; + } + }; + my $err = $@; + if ($err && $self->{sock}) { + $l =~ s/\r?\n//s; + warn("error from: $l ($err)\n"); + $tag //= '*'; + $res = \"$tag BAD program fault - command not performed\r\n"; + } + defined($res) ? $self->write($res) : 0; +} + +sub out ($$;@) { + my ($self, $fmt, @args) = @_; + printf { $self->{imapd}->{out} } $fmt."\n", @args; +} + +# callback used by PublicInbox::DS for any (e)poll (in/out/hup/err) +sub event_step { + my ($self) = @_; + local $SIG{__WARN__} = $self->{imapd}->{warn_cb}; + return unless $self->flush_write && $self->{sock} && !$self->{long_cb}; + + # only read more requests if we've drained the write buffer, + # otherwise we can be buffering infinitely w/o backpressure + + my $rbuf = $self->{rbuf} // \(my $x = ''); + my $line = index($$rbuf, "\n"); + while ($line < 0) { + if (length($$rbuf) >= LINE_MAX) { + $self->write(\"\* BAD request too long\r\n"); + return $self->close; + } + $self->do_read($rbuf, LINE_MAX, length($$rbuf)) or + return uo2m_hibernate($self); + $line = index($$rbuf, "\n"); + } + $line = substr($$rbuf, 0, $line + 1, ''); + $line =~ s/\r?\n\z//s; + return $self->close if $line =~ /[[:cntrl:]]/s; + my $t0 = now(); + my $fd = fileno($self->{sock}); + my $r = eval { process_line($self, $line) }; + my $pending = $self->{wbuf} ? ' pending' : ''; + out($self, "[$fd] %s - %0.6f$pending - $r", $line, now() - $t0); + + return $self->close if $r < 0; + $self->rbuf_idle($rbuf); + + # maybe there's more pipelined data, or we'll have + # to register it for socket-readiness notifications + $self->requeue unless $pending; +} + +# RFC 4978 +sub cmd_compress ($$$) { + my ($self, $tag, $alg) = @_; + return "$tag BAD DEFLATE only\r\n" if uc($alg) ne "DEFLATE"; + return "$tag BAD COMPRESS active\r\n" if $self->compressed; + + # CRIME made TLS compression obsolete + # return "$tag NO [COMPRESSIONACTIVE]\r\n" if $self->tls_compressed; + + PublicInbox::IMAPdeflate->enable($self) or return + \"$tag BAD failed to activate compression\r\n"; + PublicInbox::DS::write($self, \"$tag OK DEFLATE active\r\n"); + $self->requeue; + undef +} + +sub cmd_starttls ($$) { + my ($self, $tag) = @_; + (($self->{sock} // return)->can('stop_SSL') || $self->compressed) and + return "$tag BAD TLS or compression already enabled\r\n"; + $self->{imapd}->{ssl_ctx_opt} or + return "$tag BAD can not initiate TLS negotiation\r\n"; + $self->write(\"$tag OK begin TLS negotiation now\r\n"); + PublicInbox::TLS::start($self->{sock}, $self->{imapd}); + $self->requeue if PublicInbox::DS::accept_tls_step($self); + undef; +} + +sub busy { # for graceful shutdown in PublicInbox::Daemon: + my ($self) = @_; + if (defined($self->{-idle_tag})) { + $self->write(\"* BYE server shutting down\r\n"); + return; # not busy anymore + } + defined($self->{rbuf}) || defined($self->{wbuf}) || + !$self->write(\"* BYE server shutting down\r\n"); +} + +sub close { + my ($self) = @_; + if (my $ibx = delete $self->{ibx}) { + stop_idle($self, $ibx); + } + $self->SUPER::close; # PublicInbox::DS::close +} + +# we're read-only, so SELECT and EXAMINE do the same thing +no warnings 'once'; +*cmd_select = \&cmd_examine; + +package PublicInbox::IMAP_preauth; +our @ISA = qw(PublicInbox::IMAP); + +sub logged_in { 0 } + +package PublicInbox::IMAPdeflate; +use PublicInbox::DSdeflate; +our @ISA = qw(PublicInbox::DSdeflate PublicInbox::IMAP); + +1; |