# Copyright (C) 2014-2021 all contributors # License: AGPL-3.0+ # # Used for displaying the HTML web interface. # See Documentation/design_www.txt for this. package PublicInbox::View; use strict; use v5.10.1; use List::Util qw(max); use PublicInbox::MsgTime qw(msg_datestamp); use PublicInbox::Hval qw(ascii_html obfuscate_addrs prurl mid_href ts2str fmt_ts); use PublicInbox::Linkify; use PublicInbox::MID qw(id_compress mids mids_for_index references $MID_EXTRACT); use PublicInbox::MsgIter; use PublicInbox::Address; use PublicInbox::WwwStream qw(html_oneshot); use PublicInbox::Reply; use PublicInbox::ViewDiff qw(flush_diff); use PublicInbox::Eml; use Time::Local qw(timegm); use PublicInbox::Smsg qw(subject_normalized); use PublicInbox::ContentHash qw(content_hash); use constant COLS => 72; use constant INDENT => ' '; use constant TCHILD => '` '; sub th_pfx ($) { $_[0] == 0 ? '' : TCHILD }; sub msg_page_i { my ($ctx, $eml) = @_; if ($eml) { # called by WwwStream::async_eml or getline my $smsg = $ctx->{smsg}; my $over = $ctx->{ibx}->over; $ctx->{smsg} = $over ? $over->next_by_mid(@{$ctx->{next_arg}}) : $ctx->gone('over'); $ctx->{mhref} = ($ctx->{nr} || $ctx->{smsg}) ? "../${\mid_href($smsg->{mid})}/" : ''; my $obuf = $ctx->{obuf} = _msg_page_prepare_obuf($eml, $ctx); if (length($$obuf)) { multipart_text_as_html($eml, $ctx); $$obuf .= '
'; } delete $ctx->{obuf}; $$obuf .= html_footer($ctx, $ctx->{first_hdr}) if !$ctx->{smsg}; $$obuf; } else { # called by WwwStream::async_next or getline $ctx->{smsg}; # may be undef } } # /$INBOX/$MSGID/ for unindexed v1 inboxes sub no_over_html ($) { my ($ctx) = @_; my $bref = $ctx->{ibx}->msg_by_mid($ctx->{mid}) or return; # 404 my $eml = PublicInbox::Eml->new($bref); $ctx->{mhref} = ''; PublicInbox::WwwStream::init($ctx); my $obuf = $ctx->{obuf} = _msg_page_prepare_obuf($eml, $ctx); if (length($$obuf)) { multipart_text_as_html($eml, $ctx); $$obuf .= '
'; } delete $ctx->{obuf}; eval { $$obuf .= html_footer($ctx, $eml) }; html_oneshot($ctx, 200, $obuf); } # public functions: (unstable) sub msg_page { my ($ctx) = @_; my $ibx = $ctx->{ibx}; $ctx->{-obfs_ibx} = $ibx->{obfuscate} ? $ibx : undef; my $over = $ibx->over or return no_over_html($ctx); my ($id, $prev); my $next_arg = $ctx->{next_arg} = [ $ctx->{mid}, \$id, \$prev ]; my $smsg = $ctx->{smsg} = $over->next_by_mid(@$next_arg) or return; # undef == 404 # allow user to easily browse the range around this message if # they have ->over $ctx->{-t_max} = $smsg->{ts}; PublicInbox::WwwStream::aresponse($ctx, 200, \&msg_page_i); } # /$INBOX/$MESSAGE_ID/#R sub msg_reply ($$) { my ($ctx, $hdr) = @_; my $se_url = 'https://kernel.org/pub/software/scm/git/docs/git-send-email.html'; my $p_url = 'https://en.wikipedia.org/wiki/Posting_style#Interleaved_style'; my $info = ''; my $ibx = $ctx->{ibx}; if (my $url = $ibx->{infourl}) { $url = prurl($ctx->{env}, $url); $info = qq(\n List information: $url\n); } my ($arg, $link, $reply_to_all) = PublicInbox::Reply::mailto_arg_link($ibx, $hdr); if (ref($arg) eq 'SCALAR') { return '
'.ascii_html($$arg).'
'; } # mailto: link only works if address obfuscation is disabled if ($link) { $link = <In-Reply-To header via mailto: links, try the mailto: link EOF } push @$arg, '/path/to/YOUR_REPLY'; $arg = ascii_html(join(" \\\n ", '', @$arg)); <
Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and $reply_to_all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  $p_url
$info
* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email$arg

  $se_url
$link
EOF } sub in_reply_to { my ($hdr) = @_; my $refs = references($hdr); $refs->[-1]; } sub fold_addresses ($) { return $_[0] if length($_[0]) <= COLS; # try to fold on commas after non-word chars before $lim chars, # Try to get the "," preceded by ">" or ")", but avoid folding # on the comma where somebody uses "Lastname, Firstname". # We also try to keep the last and penultimate addresses in # the list on the same line if possible, hence the extra \z # Fall back to folding on spaces at $lim + 1 chars my $lim = COLS - 8; # 8 = "\t" display width my $too_long = $lim + 1; $_[0] =~ s/\s*\z//s; # Email::Simple doesn't strip trailing spaces $_[0] = join("\n\t", ($_[0] =~ /(.{0,$lim}\W(?:,|\z)| .{1,$lim}(?:,|\z)| .{1,$lim}| .{$too_long,}?)(?:\s|\z)/xgo)); } sub _hdr_names_html ($$) { my ($hdr, $field) = @_; my @vals = $hdr->header($field) or return ''; ascii_html(join(', ', PublicInbox::Address::names(join(',', @vals)))); } sub nr_to_s ($$$) { my ($nr, $singular, $plural) = @_; return "0 $plural" if $nr == 0; $nr == 1 ? "$nr $singular" : "$nr $plural"; } # Displays the text of of the message for /$INBOX/$MSGID/[Tt]/ endpoint # this is already inside a
sub eml_entry {
	my ($ctx, $eml) = @_;
	my $smsg = delete $ctx->{smsg};
	my $subj = delete $smsg->{subject};
	my $mid_raw = $smsg->{mid};
	my $id = id_compress($mid_raw, 1);
	my $id_m = 'm'.$id;
	my $root_anchor = $ctx->{root_anchor} || '';
	my $irt;
	my $obfs_ibx = $ctx->{-obfs_ibx};

	$subj = '(no subject)' if $subj eq '';
	my $rv = "* ";
	$subj = ''.ascii_html($subj).'';
	obfuscate_addrs($obfs_ibx, $subj) if $obfs_ibx;
	$subj = "$subj" if $root_anchor eq $id_m;
	$rv .= $subj . "\n";
	$rv .= _th_index_lite($mid_raw, \$irt, $id, $ctx);
	my @tocc;
	my $ds = delete $smsg->{ds}; # for v1 non-Xapian/SQLite users

	# Deleting these fields saves about 400K as we iterate across 1K msgs
	delete @$smsg{qw(ts blob)};

	my $from = _hdr_names_html($eml, 'From');
	obfuscate_addrs($obfs_ibx, $from) if $obfs_ibx;
	$rv .= "From: $from @ ".fmt_ts($ds)." UTC";
	my $upfx = $ctx->{-upfx};
	my $mhref = $upfx . mid_href($mid_raw) . '/';
	$rv .= qq{ (permalink / };
	$rv .= qq{raw)\n};
	my $to = fold_addresses(_hdr_names_html($eml, 'To'));
	my $cc = fold_addresses(_hdr_names_html($eml, 'Cc'));
	my ($tlen, $clen) = (length($to), length($cc));
	my $to_cc = '';
	if (($tlen + $clen) > COLS) {
		$to_cc .= '  To: '.$to."\n" if $tlen;
		$to_cc .= '  Cc: '.$cc."\n" if $clen;
	} else {
		if ($tlen) {
			$to_cc .= '  To: '.$to;
			$to_cc .= '; +Cc: '.$cc if $clen;
		} else {
			$to_cc .= '  Cc: '.$cc if $clen;
		}
		$to_cc .= "\n";
	}
	obfuscate_addrs($obfs_ibx, $to_cc) if $obfs_ibx;
	$rv .= $to_cc;

	my $mapping = $ctx->{mapping};
	if (!$mapping && (defined($irt) || defined($irt = in_reply_to($eml)))) {
		my $href = $upfx . mid_href($irt) . '/';
		my $html = ascii_html($irt);
		$rv .= qq(In-Reply-To: <$html>\n)
	}
	$rv .= "\n";

	# scan through all parts, looking for displayable text
	$ctx->{mhref} = $mhref;
	$ctx->{obuf} = \$rv;
	$eml->each_part(\&add_text_body, $ctx, 1);
	delete $ctx->{obuf};

	# add the footer
	$rv .= "\n^ ".
		"permalink" .
		" raw" .
		" reply";

	my $hr;
	if (defined(my $pct = $smsg->{pct})) { # used by SearchView.pm
		$rv .= "\t[relevance $pct%]";
		$hr = 1;
	} elsif ($mapping) {
		my $nested = 'nested';
		my $flat = 'flat';
		if ($ctx->{flat}) {
			$hr = 1;
			$flat = "$flat";
		} else {
			$nested = "$nested";
		}
		$rv .= "\t[$flat";
		$rv .= "|$nested]";
		$rv .= " $ctx->{s_nr}";
	} else {
		$hr = $ctx->{-hr};
	}

	# do we have more messages? start a new 
 if so
	$rv .= scalar(@{$ctx->{msgs}}) ? '

' : '
' if $hr; $rv; } sub pad_link ($$;$) { my ($mid, $level, $s) = @_; $s ||= '...'; my $href = defined($mid) ? ("($s)\n") : "($s)\n"; (' 'x19).indent_for($level).th_pfx($level).$href; } sub _skel_hdr { # my ($mapping, $mid) = @_; ($_[0]->{$_[1] // \'bogus'} // [ "(?)\n" ])->[0]; } sub _th_index_lite { my ($mid_raw, $irt, $id, $ctx) = @_; my $rv = ''; my $mapping = $ctx->{mapping} or return $rv; my $pad = ' '; my $mid_map = $mapping->{$mid_raw}; defined $mid_map or return 'public-inbox BUG: '.ascii_html($mid_raw).' not mapped'; my ($attr, $node, $idx, $level) = @$mid_map; my $children = $node->{children}; my $nr_c = scalar @$children; my $nr_s = 0; my $siblings; # delete saves about 200KB on a 1K message thread if (my $refs = delete $node->{references}) { ($$irt) = ($refs =~ m/$MID_EXTRACT\z/o); } my $irt_map = $mapping->{$$irt} if defined $$irt; if (defined $irt_map) { $siblings = $irt_map->[1]->{children}; $nr_s = scalar(@$siblings) - 1; $rv .= $pad . $irt_map->[0]; if ($idx > 0) { my $prev = $siblings->[$idx - 1]; my $pmid = $prev->{mid}; if ($idx > 2) { my $s = ($idx - 1). ' preceding siblings ...'; $rv .= pad_link($pmid, $level, $s); } elsif ($idx == 2) { $rv .= $pad . _skel_hdr($mapping, $siblings->[0] ? $siblings->[0]->{mid} : undef); } $rv .= $pad . _skel_hdr($mapping, $pmid); } } my $s_s = nr_to_s($nr_s, 'sibling', 'siblings'); my $s_c = nr_to_s($nr_c, 'reply', 'replies'); $attr =~ s!\n\z!\n!s; $attr =~ s! (?:" )?!!s; # no point in dup subject $attr =~ s!]+>([^<]+)!$1!s; # no point linking to self $rv .= "@ $attr"; if ($nr_c) { my $cmid = $children->[0] ? $children->[0]->{mid} : undef; $rv .= $pad . _skel_hdr($mapping, $cmid); if ($nr_c > 2) { my $s = ($nr_c - 1). ' more replies'; $rv .= pad_link($cmid, $level + 1, $s); } elsif (my $cn = $children->[1]) { $rv .= $pad . _skel_hdr($mapping, $cn->{mid}); } } my $next = $siblings->[$idx+1] if $siblings && $idx >= 0; if ($next) { my $nmid = $next->{mid}; $rv .= $pad . _skel_hdr($mapping, $nmid); my $nnext = $nr_s - $idx; if ($nnext > 2) { my $s = ($nnext - 1).' subsequent siblings'; $rv .= pad_link($nmid, $level, $s); } elsif (my $nn = $siblings->[$idx + 2]) { $rv .= $pad . _skel_hdr($mapping, $nn->{mid}); } } $rv .= $pad ."$s_s, $s_c; $ctx->{s_nr}\n"; } # non-recursive thread walker sub walk_thread ($$$) { my ($rootset, $ctx, $cb) = @_; my @q = map { (0, $_, -1) } @$rootset; while (@q) { my ($level, $node, $i) = splice(@q, 0, 3); defined $node or next; $cb->($ctx, $level, $node, $i) or return; ++$level; $i = 0; unshift @q, map { ($level, $_, $i++) } @{$node->{children}}; } } sub pre_thread { # walk_thread callback my ($ctx, $level, $node, $idx) = @_; $ctx->{mapping}->{$node->{mid}} = [ '', $node, $idx, $level ]; skel_dump($ctx, $level, $node); } sub thread_eml_entry { my ($ctx, $eml) = @_; my ($beg, $end) = thread_adj_level($ctx, $ctx->{level}); $beg . '
' . eml_entry($ctx, $eml) . '
' . $end; } sub next_in_queue ($$) { my ($q, $ghost_ok) = @_; while (@$q) { my ($level, $smsg) = splice(@$q, 0, 2); my $cl = $level + 1; unshift @$q, map { ($cl, $_) } @{$smsg->{children}}; return ($level, $smsg) if $ghost_ok || exists($smsg->{blob}); } undef; } sub stream_thread_i { # PublicInbox::WwwStream::getline callback my ($ctx, $eml) = @_; return thread_eml_entry($ctx, $eml) if $eml; return unless exists($ctx->{skel}); my $ghost_ok = $ctx->{nr}++; while (1) { my ($lvl, $smsg) = next_in_queue($ctx->{-queue}, $ghost_ok); if ($smsg) { if (exists $smsg->{blob}) { # next message for cat-file $ctx->{level} = $lvl; if (!$ghost_ok) { # first non-ghost $ctx->{-title_html} = ascii_html($smsg->{subject}); $ctx->zmore($ctx->html_top); } return $smsg; } # buffer the ghost entry and loop $ctx->zmore(ghost_index_entry($ctx, $lvl, $smsg)); } else { # all done $ctx->zmore(join('', thread_adj_level($ctx, 0))); $ctx->zmore(${delete($ctx->{skel})}); return; } } } sub stream_thread ($$) { my ($rootset, $ctx) = @_; $ctx->{-queue} = [ map { (0, $_) } @$rootset ]; PublicInbox::WwwStream::aresponse($ctx, 200, \&stream_thread_i); } # /$INBOX/$MSGID/t/ and /$INBOX/$MSGID/T/ sub thread_html { my ($ctx) = @_; $ctx->{-upfx} = '../../'; my $mid = $ctx->{mid}; my $ibx = $ctx->{ibx}; my ($nr, $msgs) = $ibx->over->get_thread($mid); return missing_thread($ctx) if $nr == 0; # link $INBOX_DIR/description text to "index_topics" view around # the newest message in this thread my $t = ts2str($ctx->{-t_max} = max(map { delete $_->{ts} } @$msgs)); my $t_fmt = fmt_ts($ctx->{-t_max}); my $skel = '
';
	$skel .= $nr == 1 ? 'only message in thread' : 'end of thread';
	$skel .= <~$t_fmt UTC | newest]

EOF
	$skel .= "Thread overview: ";
	$skel .= $nr == 1 ? '(only message)' : "$nr+ messages";
	$skel .= " (download: mbox.gz";
	$skel .= " / follow: Atom feed)\n";
	$skel .= "-- links below jump to the message on this page --\n";
	$ctx->{cur_level} = 0;
	$ctx->{skel} = \$skel;
	$ctx->{prev_attr} = '';
	$ctx->{prev_level} = 0;
	$ctx->{root_anchor} = 'm' . id_compress($mid, 1);
	$ctx->{mapping} = {}; # mid -> [ header_summary, node, idx, level ]
	$ctx->{s_nr} = ($nr > 1 ? "$nr+ messages" : 'only message')
	               .' in thread';

	my $rootset = thread_results($ctx, $msgs);

	# reduce hash lookups in pre_thread->skel_dump
	$ctx->{-obfs_ibx} = $ibx->{obfuscate} ? $ibx : undef;
	walk_thread($rootset, $ctx, \&pre_thread);

	$skel .= '
'; return stream_thread($rootset, $ctx) unless $ctx->{flat}; # flat display: lazy load the full message from smsg $ctx->{msgs} = $msgs; $ctx->{-html_tip} = '
';
	PublicInbox::WwwStream::aresponse($ctx, 200, \&thread_html_i);
}

sub thread_html_i { # PublicInbox::WwwStream::getline callback
	my ($ctx, $eml) = @_;
	if ($eml) {
		my $smsg = $ctx->{smsg};
		if (exists $ctx->{-html_tip}) {
			$ctx->{-title_html} = ascii_html($smsg->{subject});
			$ctx->zmore($ctx->html_top);
		}
		return eml_entry($ctx, $eml);
	} else {
		while (my $smsg = shift @{$ctx->{msgs}}) {
			return $smsg if exists($smsg->{blob});
		}
		my $skel = delete($ctx->{skel}) or return; # all done
		$ctx->zmore($$skel);
		undef;
	}
}

sub multipart_text_as_html {
	# ($mime, $ctx) = @_; # each_part may do "$_[0] = undef"

	# scan through all parts, looking for displayable text
	$_[0]->each_part(\&add_text_body, $_[1], 1);
}

sub submsg_hdr ($$) {
	my ($ctx, $eml) = @_;
	my $obfs_ibx = $ctx->{-obfs_ibx};
	my $rv = $ctx->{obuf};
	$$rv .= "\n";
	for my $h (qw(From To Cc Subject Date Message-ID X-Alt-Message-ID)) {
		my @v = $eml->header($h);
		for my $v (@v) {
			obfuscate_addrs($obfs_ibx, $v) if $obfs_ibx;
			$v = ascii_html($v);
			$$rv .= "$h: $v\n";
		}
	}
}

sub attach_link ($$$$;$) {
	my ($ctx, $ct, $p, $fn, $err) = @_;
	my ($part, $depth, $idx) = @$p;

	# Eml iteration clobbers multipart ->{bdy}, so do not offer
	# downloads for 0-byte multipart attachments
	return unless $part->{bdy};

	my $nl = $idx eq '1' ? '' : "\n"; # like join("\n", ...)
	my $size = length($part->body);
	delete $part->{bdy}; # save memory

	# hide attributes normally, unless we want to aid users in
	# spotting MUA problems:
	$ct =~ s/;.*// unless $err;
	$ct = ascii_html($ct);
	my $sfn;
	if (defined $fn && $fn =~ /\A$PublicInbox::Hval::FN\z/o) {
		$sfn = $fn;
	} elsif ($ct eq 'text/plain') {
		$sfn = 'a.txt';
	} else {
		$sfn = 'a.bin';
	}
	my $rv = $ctx->{obuf};
	$$rv .= qq($nl{mhref}$idx-$sfn">);
	if ($err) {
		$$rv .= <header('Content-Description') // $fn // '';
	$desc = ascii_html($desc);
	$$rv .= ($desc eq '') ? "$ts --]" : "$desc --]\n[-- $ts --]";
	$$rv .= "\n";

	submsg_hdr($ctx, $part) if $part->{is_submsg};

	undef;
}

sub add_text_body { # callback for each_part
	my ($p, $ctx) = @_;
	my $upfx = $ctx->{mhref};
	my $ibx = $ctx->{ibx};
	my $l = $ctx->{-linkify} //= PublicInbox::Linkify->new;
	# $p - from each_part: [ Email::MIME-like, depth, $idx ]
	my ($part, $depth, $idx) = @$p;
	my $ct = $part->content_type || 'text/plain';
	my $fn = $part->filename;
	my ($s, $err) = msg_part_text($part, $ct);
	return attach_link($ctx, $ct, $p, $fn) unless defined $s;

	my $rv = $ctx->{obuf};
	if ($part->{is_submsg}) {
		submsg_hdr($ctx, $part);
		$$rv .= "\n";
	}

	# makes no difference to browsers, and don't screw up filename
	# link generation in diffs with the extra '%0D'
	$s =~ s/\r+\n/\n/sg;

	# will be escaped to `•' in HTML
	obfuscate_addrs($ibx, $s, "\x{2022}") if $ibx->{obfuscate};

	# always support diff-highlighting, but we can't linkify hunk
	# headers for solver unless some coderepo are configured:
	my $diff;
	if ($s =~ /^--- [^\n]+\n\+{3} [^\n]+\n@@ /ms) {
		# diffstat anchors do not link across attachments or messages,
		# -apfx is just a stable prefix for making diffstat anchors
		# linkable to the first diff hunk w/o crossing attachments
		$idx =~ tr!.!/!; # compatibility with previous versions
		$ctx->{-apfx} = $upfx . $idx;

		# do attr => filename mappings for diffstats in git diffs:
		$ctx->{-anchors} = {} if $s =~ /^diff --git /sm;
		$diff = 1;
		delete $ctx->{-long_path};
		my $spfx;
		# absolute URL (Atom feeds)
		if ($ibx->{coderepo}) {
			if (index($upfx, '//') >= 0) {
				$spfx = $upfx;
				$spfx =~ s!/([^/]*)/\z!/!;
			} else {
				my $n_slash = $upfx =~ tr!/!/!;
				if ($n_slash == 0) {
					$spfx = '../';
				} elsif ($n_slash == 1) {
					$spfx = '';
				} else { # nslash == 2
					$spfx = '../../';
				}
			}
		}
		$ctx->{-spfx} = $spfx;
	};

	# split off quoted and unquoted blocks:
	my @sections = PublicInbox::MsgIter::split_quotes($s);
	undef $s; # free memory
	if (defined($fn) || ($depth > 0 && !$part->{is_submsg}) || $err) {
		# badly-encoded message with $err? tell the world about it!
		attach_link($ctx, $ct, $p, $fn, $err);
		$$rv .= "\n";
	}
	delete $part->{bdy}; # save memory
	foreach my $cur (@sections) {
		if ($cur =~ /\A>/) {
			# we use a  here to allow users to specify
			# their own color for quoted text
			$$rv .= qq();
			$$rv .= $l->to_html($cur);
			$$rv .= '';
		} elsif ($diff) {
			flush_diff($ctx, \$cur);
		} else {
			# regular lines, OK
			$$rv .= $l->to_html($cur);
		}
		undef $cur; # free memory
	}
}

sub _msg_page_prepare_obuf {
	my ($eml, $ctx) = @_;
	my $over = $ctx->{ibx}->over;
	my $obfs_ibx = $ctx->{-obfs_ibx};
	my $rv = '';
	my $mids = mids_for_index($eml);
	my $nr = $ctx->{nr}++;
	if ($nr) { # unlikely
		if ($ctx->{chash} eq content_hash($eml)) {
			warn "W: BUG? @$mids not deduplicated properly\n";
			return \$rv;
		}
		$rv .=
"
WARNING: multiple messages have this Message-ID\n
"; $rv .= '
';
	} else {
		$ctx->{first_hdr} = $eml->header_obj;
		$ctx->{chash} = content_hash($eml) if $ctx->{smsg}; # reused MID
		$rv .= ""; # anchor for body start
	}
	$ctx->{-upfx} = '../' if $over;
	my @title; # (Subject[0], From[0])
	for my $v ($eml->header('From')) {
		my @n = PublicInbox::Address::names($v);
		$v = ascii_html($v);
		$title[1] //= ascii_html(join(', ', @n));
		if ($obfs_ibx) {
			obfuscate_addrs($obfs_ibx, $v);
			obfuscate_addrs($obfs_ibx, $title[1]);
		}
		$rv .= "From: $v\n" if $v ne '';
	}
	foreach my $h (qw(To Cc)) {
		for my $v ($eml->header($h)) {
			fold_addresses($v);
			$v = ascii_html($v);
			obfuscate_addrs($obfs_ibx, $v) if $obfs_ibx;
			$rv .= "$h: $v\n" if $v ne '';
		}
	}
	my @subj = $eml->header('Subject');
	if (@subj) {
		my $v = ascii_html(shift @subj);
		obfuscate_addrs($obfs_ibx, $v) if $obfs_ibx;
		$rv .= 'Subject: ';
		$rv .= $over ? qq($v\n) : "$v\n";
		$title[0] = $v;
		for $v (@subj) { # multi-Subject message :<
			$v = ascii_html($v);
			obfuscate_addrs($obfs_ibx, $v) if $obfs_ibx;
			$rv .= "Subject: $v\n";
		}
	} else { # dummy anchor for thread skeleton at bottom of page
		$rv .= qq() if $over;
		$title[0] = '(no subject)';
	}
	for my $v ($eml->header('Date')) {
		$v = ascii_html($v);
		obfuscate_addrs($obfs_ibx, $v) if $obfs_ibx; # possible :P
		$rv .= qq{Date: $v\t[thread overview]\n};
	}
	if (!$nr) { # first (and only) message, common case
		$ctx->{-title_html} = join(' - ', @title);
		$rv = $ctx->html_top . $rv;
	}
	if (scalar(@$mids) == 1) { # common case
		my $mhtml = ascii_html($mids->[0]);
		$rv .= "Message-ID: <$mhtml> ";
		$rv .= "(raw)\n";
	} else {
		# X-Alt-Message-ID can happen if a message is injected from
		# public-inbox-nntpd because of multiple Message-ID headers.
		my $lnk = PublicInbox::Linkify->new;
		my $s = '';
		for my $h (qw(Message-ID X-Alt-Message-ID)) {
			$s .= "$h: $_\n" for ($eml->header_raw($h));
		}
		$lnk->linkify_mids('..', \$s, 1);
		$rv .= $s;
	}
	$rv .= _parent_headers($eml, $over);
	$rv .= "\n";
	\$rv;
}

sub SKEL_EXPAND () {
	qq(expand[flat) .
		qq(|nested]  ) .
		qq(mbox.gz  ) .
		qq(Atom feed);
}

sub thread_skel ($$$) {
	my ($skel, $ctx, $hdr) = @_;
	my $mid = mids($hdr)->[0];
	my $ibx = $ctx->{ibx};
	my ($nr, $msgs) = $ibx->over->get_thread($mid);
	my $parent = in_reply_to($hdr);
	$$skel .= "\nThread overview: ";
	if ($nr <= 1) {
		if (defined $parent) {
			$$skel .= SKEL_EXPAND."\n ";
			$$skel .= ghost_parent('../', $parent) . "\n";
		} else {
			$$skel .= "[no followups] ".
					SKEL_EXPAND."\n";
		}
		$ctx->{next_msg} = undef;
		$ctx->{parent_msg} = $parent;
		return;
	}

	$$skel .= $nr;
	$$skel .= '+ messages / '.SKEL_EXPAND.qq!  top\n!;

	# nb: mutt only shows the first Subject in the index pane
	# when multiple Subject: headers are present, so we follow suit:
	my $subj = $hdr->header('Subject') // '';
	$subj = '(no subject)' if $subj eq '';
	$ctx->{prev_subj} = [ split(/ /, subject_normalized($subj)) ];
	$ctx->{cur} = $mid;
	$ctx->{prev_attr} = '';
	$ctx->{prev_level} = 0;
	$ctx->{skel} = $skel;

	# reduce hash lookups in skel_dump
	$ctx->{-obfs_ibx} = $ibx->{obfuscate} ? $ibx : undef;
	walk_thread(thread_results($ctx, $msgs), $ctx, \&skel_dump);

	$ctx->{parent_msg} = $parent;
}

sub _parent_headers {
	my ($hdr, $over) = @_;
	my $rv = '';
	my @irt = $hdr->header_raw('In-Reply-To');
	my $refs;
	if (@irt) {
		my $lnk = PublicInbox::Linkify->new;
		$rv .= "In-Reply-To: $_\n" for @irt;
		$lnk->linkify_mids('..', \$rv);
	} else {
		$refs = references($hdr);
		my $irt = pop @$refs;
		if (defined $irt) {
			my $html = ascii_html($irt);
			my $href = mid_href($irt);
			$rv .= "In-Reply-To: <";
			$rv .= "$html>\n";
		}
	}

	# do not display References: if search is present,
	# we show the thread skeleton at the bottom, instead.
	return $rv if $over;

	$refs //= references($hdr);
	if (@$refs) {
		@$refs = map { linkify_ref_no_over($_) } @$refs;
		$rv .= 'References: '. join("\n\t", @$refs) . "\n";
	}
	$rv;
}

# returns a string buffer
sub html_footer {
	my ($ctx, $hdr) = @_;
	my $ibx = $ctx->{ibx};
	my $upfx = '../';
	my $skel;
	my $rv = '
';
	if ($ibx->over) {
		my $t = ts2str($ctx->{-t_max});
		my $t_fmt = fmt_ts($ctx->{-t_max});
		$skel .= <~$t_fmt UTC|newest]
EOF

		thread_skel(\$skel, $ctx, $hdr);
		my ($next, $prev);
		my $parent = '       ';
		$next = $prev = '    ';

		if (my $n = $ctx->{next_msg}) {
			$n = mid_href($n);
			$next = "next";
		}
		my $u;
		my $par = $ctx->{parent_msg};
		if ($par) {
			$u = mid_href($par);
			$u = "$upfx$u/";
		}
		if (my $p = $ctx->{prev_msg}) {
			$prev = mid_href($p);
			if ($p && $par && $p eq $par) {
				$prev = "prev parent';
				$parent = '';
			} else {
				$prev = "prev';
				$parent = " parent" if $u;
			}
		} elsif ($u) { # unlikely
			$parent = " parent";
		}
		$rv .= "$next $prev$parent ";
	} else { # unindexed inboxes w/o over
		$skel = qq( latest);
	}
	$rv .= qq(reply);
	$rv .= $skel;
	$rv .= '
'; $rv .= msg_reply($ctx, $hdr); } sub linkify_ref_no_over { my ($mid) = @_; my $href = mid_href($mid); my $html = ascii_html($mid); "<$html>"; } sub ghost_parent { my ($upfx, $mid) = @_; my $href = mid_href($mid); my $html = ascii_html($mid); qq{[parent not found: <$html>]}; } sub indent_for { my ($level) = @_; $level ? INDENT x ($level - 1) : ''; } sub find_mid_root { my ($ctx, $level, $node, $idx) = @_; ++$ctx->{root_idx} if $level == 0; if ($node->{mid} eq $ctx->{mid}) { $ctx->{found_mid_at} = $ctx->{root_idx}; return 0; # stop iterating } 1; } sub strict_loose_note ($) { my ($nr) = @_; my $msg = " -- strict thread matches above, loose matches on Subject: below --\n"; if ($nr > PublicInbox::Over::DEFAULT_LIMIT()) { $msg .= " -- use mbox.gz link to download all $nr messages --\n"; } $msg; } sub thread_results { my ($ctx, $msgs) = @_; require PublicInbox::SearchThread; my $rootset = PublicInbox::SearchThread::thread($msgs, \&sort_ds, $ctx); # FIXME: `tid' is broken on --reindex, so that needs to be fixed # and preserved in the future. This bug is hidden by `sid' matches # in get_thread, so we never noticed it until now. And even when # reindexing is fixed, we'll keep this code until a SCHEMA_VERSION # bump since reindexing is expensive and users may not do it # loose threading could've returned too many results, # put the root the message we care about at the top: my $mid = $ctx->{mid}; if (defined($mid) && scalar(@$rootset) > 1) { $ctx->{root_idx} = -1; my $nr = scalar @$msgs; walk_thread($rootset, $ctx, \&find_mid_root); my $idx = $ctx->{found_mid_at}; if (defined($idx) && $idx != 0) { my $tip = splice(@$rootset, $idx, 1); @$rootset = reverse @$rootset; unshift @$rootset, $tip; $ctx->{sl_note} = strict_loose_note($nr); } } $rootset } sub missing_thread { my ($ctx) = @_; require PublicInbox::ExtMsg; PublicInbox::ExtMsg::ext_msg($ctx); } sub dedupe_subject { my ($prev_subj, $subj, $val) = @_; my $omit; # '"' denotes identical text omitted my (@prev_pop, @curr_pop); while (@$prev_subj && @$subj && $subj->[-1] eq $prev_subj->[-1]) { push(@prev_pop, pop(@$prev_subj)); push(@curr_pop, pop(@$subj)); $omit //= $val; } pop @$subj if @$subj && $subj->[-1] =~ /^re:\s*/i; if (scalar(@curr_pop) == 1) { $omit = undef; push @$prev_subj, @prev_pop; push @$subj, @curr_pop; } $omit // ''; } sub skel_dump { # walk_thread callback my ($ctx, $level, $smsg) = @_; $smsg->{blob} or return _skel_ghost($ctx, $level, $smsg); my $skel = $ctx->{skel}; my $cur = $ctx->{cur}; my $mid = $smsg->{mid}; if ($level == 0 && $ctx->{skel_dump_roots}++) { $$skel .= delete($ctx->{sl_note}) || ''; } my $f = ascii_html(delete $smsg->{from_name}); my $obfs_ibx = $ctx->{-obfs_ibx}; obfuscate_addrs($obfs_ibx, $f) if $obfs_ibx; my $d = fmt_ts($smsg->{ds}); my $unmatched; # if lazy-loaded by SearchThread::Msg::visible() if (exists $ctx->{searchview}) { if (defined(my $pct = $smsg->{pct})) { $d .= (sprintf(' % 2u', $pct) . '%'); } else { $unmatched = 1; $d .= ' '; } } $d .= ' ' . indent_for($level) . th_pfx($level); my $attr = $f; $ctx->{first_level} ||= $level; if ($attr ne $ctx->{prev_attr} || $ctx->{prev_level} > $level) { $ctx->{prev_attr} = $attr; } $ctx->{prev_level} = $level; if ($cur) { if ($cur eq $mid) { delete $ctx->{cur}; $$skel .= "$d". "$attr [this message]\n"; return 1; } else { $ctx->{prev_msg} = $mid; } } else { $ctx->{next_msg} ||= $mid; } # Subject is never undef, this mail was loaded from # our Xapian which would've resulted in '' if it were # really missing (and Filter rejects empty subjects) my @subj = split(/ /, subject_normalized($smsg->{subject})); # remove common suffixes from the subject if it matches the previous, # so we do not show redundant text at the end. my $prev_subj = $ctx->{prev_subj} || []; $ctx->{prev_subj} = [ @subj ]; my $omit = dedupe_subject($prev_subj, \@subj, '" '); my $end; if (@subj) { my $subj = join(' ', @subj); $subj = ascii_html($subj); obfuscate_addrs($obfs_ibx, $subj) if $obfs_ibx; $end = "$subj $omit$f\n" } else { $end = "$f\n"; } my $m; my $id = ''; my $mapping = $unmatched ? undef : $ctx->{mapping}; if ($mapping) { my $map = $mapping->{$mid}; $id = id_compress($mid, 1); $m = '#m'.$id; $map->[0] = "$d$end"; $id = "\nid=r".$id; } else { $m = $ctx->{-upfx}.mid_href($mid).'/'; } $$skel .= $d . "" . $end; 1; } sub _skel_ghost { my ($ctx, $level, $node) = @_; my $mid = $node->{mid}; my $d = ' [not found] '; $d .= ' ' if exists $ctx->{searchview}; $d .= indent_for($level) . th_pfx($level); my $upfx = $ctx->{-upfx}; my $href = $upfx . mid_href($mid) . '/'; my $html = ascii_html($mid); my $mapping = $ctx->{mapping}; my $map = $mapping->{$mid} if $mapping; if ($map) { my $id = id_compress($mid, 1); $map->[0] = $d . qq{<$html>\n}; $d .= qq{<$html>\n}; } else { $d .= qq{<$html>\n}; } ${$ctx->{skel}} .= $d; 1; } sub sort_ds { @{$_[0]} = sort { (eval { $a->topmost->{ds} } || 0) <=> (eval { $b->topmost->{ds} } || 0) } @{$_[0]}; } # accumulate recent topics if search is supported # returns 200 if done, 404 if not sub acc_topic { # walk_thread callback my ($ctx, $level, $smsg) = @_; my $mid = $smsg->{mid}; my $has_blob = $smsg->{blob} // do { if (my $by_mid = $ctx->{ibx}->smsg_by_mid($mid)) { %$smsg = (%$smsg, %$by_mid); 1; } }; if ($has_blob) { my $subj = subject_normalized($smsg->{subject}); $subj = '(no subject)' if $subj eq ''; my $ds = $smsg->{ds}; if ($level == 0) { # new, top-level topic my $topic = [ $ds, 1, { $subj => $mid }, $subj ]; $ctx->{-cur_topic} = $topic; push @{$ctx->{order}}, $topic; return 1; } # continue existing topic my $topic = $ctx->{-cur_topic}; # should never be undef $topic->[0] = $ds if $ds > $topic->[0]; $topic->[1]++; # bump N+ message counter my $seen = $topic->[2]; if (scalar(@$topic) == 3) { # parent was a ghost push @$topic, $subj; } elsif (!defined($seen->{$subj})) { push @$topic, $level, $subj; # @extra messages } $seen->{$subj} = $mid; # latest for subject } else { # ghost message return 1 if $level != 0; # ignore child ghosts my $topic = $ctx->{-cur_topic} = [ -666, 0, {} ]; push @{$ctx->{order}}, $topic; } 1; } sub dump_topics { my ($ctx) = @_; my $order = delete $ctx->{order}; # [ ds, subj1, subj2, subj3, ... ] unless ($order) { $ctx->{-html_tip} = '
[No topics in range]
'; return 404; } my @out; my $ibx = $ctx->{ibx}; my $obfs_ibx = $ibx->{obfuscate} ? $ibx : undef; # sort by recency, this allows new posts to "bump" old topics... foreach my $topic (sort { $b->[0] <=> $a->[0] } @$order) { my ($ds, $n, $seen, $top_subj, @extra) = @$topic; @$topic = (); next unless defined $top_subj; # ghost topic my $mid = delete $seen->{$top_subj}; my $href = mid_href($mid); my $prev_subj = [ split(/ /, $top_subj) ]; $top_subj = ascii_html($top_subj); $ds = fmt_ts($ds); # $n isn't the total number of posts on the topic, # just the number of posts in the current results window my $anchor; if ($n == 1) { $n = ''; $anchor = '#u'; # top of only message } else { $n = " ($n+ messages)"; $anchor = '#t'; # thread skeleton } my $s = "$top_subj\n" . " $ds UTC $n\n"; for (my $i = 0; $i < scalar(@extra); $i += 2) { my $level = $extra[$i]; my $subj = $extra[$i + 1]; # already normalized $mid = delete $seen->{$subj}; my @subj = split(/ /, $subj); my @next_prev = @subj; # full copy my $omit = dedupe_subject($prev_subj, \@subj, ' "'); $prev_subj = \@next_prev; $subj = join(' ', @subj); $subj = ascii_html($subj); obfuscate_addrs($obfs_ibx, $subj) if $obfs_ibx; $href = mid_href($mid); $s .= indent_for($level) . TCHILD; $s .= qq($subj$omit\n); } push @out, $s; } $ctx->{-html_tip} = '
' . join("\n", @out) . '
'; 200; } sub str2ts ($) { my ($yyyy, $mon, $dd, $hh, $mm, $ss) = unpack('A4A2A2A2A2A2', $_[0]); timegm($ss || 0, $mm || 0, $hh || 0, $dd, $mon - 1, $yyyy); } sub pagination_footer ($$) { my ($ctx, $latest) = @_; my $next = $ctx->{next_page} || ''; my $prev = $ctx->{prev_page} || ''; if ($prev) { # aligned padding for: 'next (older) | ' $next = $next ? "$next | " : ' | '; $prev .= qq[ | latest]; } "
page: $next$prev
"; } sub paginate_recent ($$) { my ($ctx, $lim) = @_; my $t = $ctx->{qp}->{t} || ''; my $opts = { limit => $lim }; my ($after, $before); # Xapian uses '..' but '-' is perhaps friendier to URL linkifiers # if only $after exists "YYYYMMDD.." because "." could be skipped # if interpreted as an end-of-sentence $t =~ s/\A([0-9]{8,14})-// and $after = str2ts($1); $t =~ /\A([0-9]{8,14})\z/ and $before = str2ts($1); my $ibx = $ctx->{ibx}; my $msgs = $ibx->recent($opts, $after, $before); my $nr = scalar @$msgs; if ($nr < $lim && defined($after)) { $after = $before = undef; $msgs = $ibx->recent($opts); $nr = scalar @$msgs; } my $more = $nr == $lim; my ($newest, $oldest); if ($nr) { $newest = $msgs->[0]->{ts}; $oldest = $msgs->[-1]->{ts}; # if we only had $after, our SQL query in ->recent ordered if ($newest < $oldest) { ($oldest, $newest) = ($newest, $oldest); $more = 0 if defined($after) && $after < $oldest; } } if (defined($oldest) && $more) { my $s = ts2str($oldest); $ctx->{next_page} = qq[] . 'next (older)'; } if (defined($newest) && (defined($before) || defined($after))) { my $s = ts2str($newest); $ctx->{prev_page} = qq[] . 'prev (newer)'; } $msgs; } # GET /$INBOX - top-level inbox view for indexed inboxes sub index_topics { my ($ctx) = @_; my $msgs = paginate_recent($ctx, 200); # 200 is our window if (@$msgs) { walk_thread(thread_results($ctx, $msgs), $ctx, \&acc_topic); } html_oneshot($ctx, dump_topics($ctx), \pagination_footer($ctx, '.')); } sub thread_adj_level { my ($ctx, $level) = @_; my $max = $ctx->{cur_level}; if ($level <= 0) { return ('', '') if $max == 0; # flat output # reset existing lists my $beg = $max > 1 ? ('' x ($max - 1)) : ''; $ctx->{cur_level} = 0; ("$beg", ''); } elsif ($level == $max) { # continue existing list qw(
  • ); } elsif ($level < $max) { my $beg = $max > 1 ? ('' x ($max - $level)) : ''; $ctx->{cur_level} = $level; ("$beg
  • ", '
  • '); } else { # ($level > $max) # start a new level $ctx->{cur_level} = $level; my $beg = ($max ? '
  • ' : '') . '
    • '; ($beg, '
    • '); } } sub ghost_index_entry { my ($ctx, $level, $node) = @_; my ($beg, $end) = thread_adj_level($ctx, $level); $beg . '
      '. ghost_parent($ctx->{-upfx}, $node->{mid} // '?')
      		. '
      ' . $end; } 1;