#!/usr/bin/perl

# $Id$

# small script to show in an intuitive way who signed which of your user ids
#
# Copyright (c) 2004 Uli Martens <uli@youam.net>
# Copyright (c) 2005 Peter Palfrader <peter@palfrader.org>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. The name of the author may not be used to endorse or promote products
#    derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

=pod

=head1 NAME

gpglist -- show who signed which of your UIDs

=head1 SYNOPSIS

=over

=item B<gpglist> I<keyid>

=back

=head1 DESCRIPTION

B<gpglist> takes a keyid and creates a listing showing who signed your user IDs.

	$ gpglist 6D8ABE71
	+-----  1 Christoph Berg <cb@df7cb.de>
	|  +--  2 Christoph Berg <cb@cs.uni-sb.de>
	1  2  
	x     7929AB90F7AC3AF0 Martin Helas <mhelas@helas.net>
	x  x  29BE5D2268FD549F Martin Michlmayr <tbm@cyrius.com>
	   x  7DDB2B8DB4B462C5 Martin Wanke <mawan@mawan.de>

=head1 AUTHORS

=over

=item Uli Martens <uli@youam.net>

=item Peter Palfrader <peter@palfrader.org>

=back

=head1 WEBSITE

http://pgp-tools.alioth.debian.org/

=head1 SEE ALSO

gpgsigs(1), gpg(1), caff(1).

=cut

use strict;
use warnings;
use English '-no_match_vars';

my $now = time;
my $key=shift @ARGV;
unless (defined $key) {
	die "Usage: $PROGRAM_NAME <keyid>\n";
}

open SIGS, '-|', $ENV{GNUPGBIN} // 'gpg', qw/--no-auto-check-trustdb --list-options show-sig-subpackets --fixed-list-mode --with-colons --list-sigs/, $key
	or die "can't get gpg listing";

my ($uid, $id) = ('', '');
my (%uids, @uids);
my %sigs;
my %revs;
my %ids;
my $longkey;
while (<SIGS>) {
	if (/^uid:(?:[^:]*:){6}([0-9A-F]{40}):[^:]*:([^:]+)/) {
		$uid = $1; # use the hash to have proper distinction between UATs
		push @uids, $uid; # preserve the order
		$uids{$uid} = $2;
	}
	elsif (/^sig:(?:[^:]*:){3}([0-9A-F]{16}):(\d+):(\d*):(?:[^:]*:){2}([^:]+):(1[0-3][lx])(?::.*)?$/) {
		$id = $1;
		next if $3 ne '' and $3 < $now; # expired
		$ids{$id} = $4;
		# keep only the most recent sig (a more recent sig might appear anywhere in the list)
		$sigs{$id}->{$uid} = $2 unless defined $sigs{$id}->{$uid} and
									  ($sigs{$id}->{$uid} < 0 or # non revocable sig
									  $sigs{$id}->{$uid} > $2);
	}
	elsif (/^spk:7:1:1:%00$/) { # non-revocable signature
		$sigs{$id}->{$uid} = -1;
	}
	elsif (/^rev:(?:[^:]*:){3}([0-9A-F]{16}):(\d+):(?:[^:]*:){4}30x(?::.*)?$/) {
		$revs{$1}->{$uid} = $2;
	}
	elsif (/^uat:(?:[^:]*:){6}([0-9A-F]{40}):/) {
		$uid = $1;
		push @uids, $uid; # preserve the order
		$uids{$uid} = "Photo ID"; # XXX [jpeg image of size ...]
	}
	elsif (/^pub:(?:[^:]*:){3}([0-9A-F]{16}):/) {
		$longkey = $1;
	}
	elsif (/^sub:/) {
		last;
	}
	elsif (!/^(?:fpr|tru|rvk|spk):/) {
		print STDERR "hi, i'm a bug. please report me to my owner\n";
		die "input: $_, key: $key";
	}
}
close SIGS;

# XXX: Add an option for this
@uids = grep { !defined $revs{$longkey}->{$_} } @uids;

for ( my $a=0; $a <= $#uids; $a++ ) {
	printf "|  " x $a
	     . "+--"
	     . "---" x ($#uids-$a)
	     . (defined $revs{$longkey}->{$uids[$a]} ? "R" : " ") # revuid
	     . "%2i $uids{$uids[$a]}\n", $a+1;
}

for ( my $a=0; $a <= $#uids; $a++ ) {
	printf "%-2i ", $a+1;
}
print "\n";

for my $id (sort {$ids{$a} cmp $ids{$b}} keys %ids) {
	foreach my $uid (@uids) {
		if (defined $revs{$id}->{$uid} and defined $sigs{$id}->{$uid} and
				$sigs{$id}->{$uid} > 0 and # < 0 means non-revocable
				$revs{$id}->{$uid} > $sigs{$id}->{$uid}) {
			print 'R';
		} else {
			print (defined $sigs{$id}->{$uid} ? 'x' : ' ');
		}
		print '  ';
	}
	print "$id $ids{$id}\n";
}
