# Copyright (C) 2015-2020 all contributors # License: AGPL-3.0+ # # Used by the web interface to link to messages outside of the our # public-inboxes. Mail threads may cross projects/threads; so # we should ensure users can find more easily find them on other # sites. package PublicInbox::ExtMsg; use strict; use warnings; use PublicInbox::Hval qw(ascii_html prurl mid_href); use PublicInbox::WwwStream; use PublicInbox::Smsg; our $MIN_PARTIAL_LEN = 16; # TODO: user-configurable our @EXT_URL = map { ascii_html($_) } ( # leading "//" denotes protocol-relative (http:// or https://) '//marc.info/?i=%s', '//www.mail-archive.com/search?l=mid&q=%s', 'nntp://news.gmane.io/%s', 'https://lists.debian.org/msgid-search/%s', '//docs.FreeBSD.org/cgi/mid.cgi?db=mid&id=%s', 'https://www.w3.org/mid/%s', 'http://www.postgresql.org/message-id/%s', 'https://lists.debconf.org/cgi-lurker/keyword.cgi?'. 'doc-url=/lurker&format=en.html&query=id:%s' ); sub PARTIAL_MAX () { 100 } sub mids_from_mset { # Search::retry_reopen callback [ map { PublicInbox::Smsg::from_mitem($_)->mid } $_[0]->items ]; } sub search_partial ($$) { my ($srch, $mid) = @_; return if length($mid) < $MIN_PARTIAL_LEN; my $opt = { limit => PARTIAL_MAX, mset => 2 }; my @try = ("m:$mid*"); my $chop = $mid; if ($chop =~ s/(\W+)(\w*)\z//) { my ($delim, $word) = ($1, $2); if (length($word)) { push @try, "m:$chop$delim"; push @try, "m:$chop$delim*"; } push @try, "m:$chop"; push @try, "m:$chop*"; } # break out long words individually to search for, because # too many messages begin with "Pine.LNX." (or "alpine" or "nycvar") if ($mid =~ /\w{9,}/) { my @long = ($mid =~ m!(\w{3,})!g); push(@try, join(' ', map { "m:$_" } @long)); # is the last element long enough to not trigger excessive # wildcard matches? if (length($long[-1]) > 8) { $long[-1] .= '*'; push(@try, join(' ', map { "m:$_" } @long)); } } foreach my $m (@try) { # If Xapian can't handle the wildcard since it # has too many results. $@ can be # Search::Xapian::QueryParserError or even: # "something terrible happened at ../Search/Xapian/Enquire.pm" my $mset = eval { $srch->query($m, $opt) } or next; my $mids = $srch->retry_reopen(\&mids_from_mset, $mset); return $mids if scalar(@$mids); } } sub ext_msg_i { my ($other, $arg) = @_; my ($cur, $mid, $ibxs, $found) = @$arg; return if $other->{name} eq $cur->{name} || !$other->base_url; my $mm = $other->mm or return; # try to find the URL with Msgmap to avoid forking my $num = $mm->num_for($mid); if (defined $num) { push @$found, $other; } else { # no point in trying the fork fallback if we # know Xapian is up-to-date but missing the # message in the current repo push @$ibxs, $other; } } sub ext_msg { my ($ctx) = @_; my $cur = $ctx->{-inbox}; my $mid = $ctx->{mid}; eval { require PublicInbox::Msgmap }; my $ibxs = []; my $found = []; my $arg = [ $cur, $mid, $ibxs, $found ]; $ctx->{www}->{pi_config}->each_inbox(\&ext_msg_i, $arg); return exact($ctx, $found, $mid) if @$found; # fall back to partial MID matching my @partial; my $n_partial = 0; my $srch = $cur->search; my $mids = search_partial($srch, $mid) if $srch; if ($mids) { $n_partial = scalar(@$mids); push @partial, [ $cur, $mids ]; } # can't find a partial match in current inbox, try the others: if (!$n_partial && length($mid) >= $MIN_PARTIAL_LEN) { foreach my $ibx (@$ibxs) { $srch = $ibx->search or next; $mids = search_partial($srch, $mid) or next; $n_partial += scalar(@$mids); push @partial, [ $ibx, $mids]; last if $n_partial >= PARTIAL_MAX; } } my $code = 404; my $href = mid_href($mid); my $html = ascii_html($mid); my $title = "<$html> not found"; my $s = "
Message-ID <$html>\nnot found\n";
	if ($n_partial) {
		$code = 300;
		my $es = $n_partial == 1 ? '' : 'es';
		$n_partial .= '+' if ($n_partial == PARTIAL_MAX);
		$s .= "\n$n_partial partial match$es found:\n\n";
		my $cur_name = $cur->{name};
		foreach my $pair (@partial) {
			my ($ibx, $res) = @$pair;
			my $env = $ctx->{env} if $ibx->{name} eq $cur_name;
			my $u = $ibx->base_url($env) or next;
			foreach my $m (@$res) {
				my $href = mid_href($m);
				my $html = ascii_html($m);
				$s .= qq{$u$html/\n};
			}
		}
	}
	my $ext = ext_urls($ctx, $mid, $href, $html);
	if ($ext ne '') {
		$s .= $ext;
		$code = 300;
	}
	$ctx->{-html_tip} = $s .= '
'; $ctx->{-title_html} = $title; $ctx->{-upfx} = '../'; PublicInbox::WwwStream->response($ctx, $code); } sub ext_urls { my ($ctx, $mid, $href, $html) = @_; # Fall back to external repos if configured if (@EXT_URL && index($mid, '@') >= 0) { my $env = $ctx->{env}; my $e = "\nPerhaps try an external site:\n\n"; foreach my $url (@EXT_URL) { my $u = prurl($env, $url); my $r = sprintf($u, $href); my $t = sprintf($u, $html); $e .= qq{$t\n}; } return $e; } '' } sub exact { my ($ctx, $found, $mid) = @_; my $href = mid_href($mid); my $html = ascii_html($mid); my $title = "<$html> found in "; my $end = @$found == 1 ? 'another inbox' : 'other inboxes'; $ctx->{-title_html} = $title . $end; $ctx->{-upfx} = '../'; my $ext_urls = ext_urls($ctx, $mid, $href, $html); my $code = (@$found == 1 && $ext_urls eq '') ? 200 : 300; $ctx->{-html_tip} = join('', "
Message-ID: <$html>\nfound in $end:\n\n",
				(map {
					my $u = $_->base_url;
					qq($u$html/\n)
				} @$found),
			$ext_urls, '
'); PublicInbox::WwwStream->response($ctx, $code); } 1;