sub check_privacy
	{
	my ($t, $k) = @_;
	$k = -1 unless (defined($k));
	if ($USER == -1 && $t->{private} > 0)
		{ return 0; }
	if ($t->{private} < 2)
		{ return 1; }
	if ($t->{username} eq $USER->{username})
		{ return 1; }
	if (check_key($t->{allowed}, $USER->{id}))
		{ return 1; }
	if ($USER->{ulevel} == 3)   # A:.H:.
		{ return 1; }
	if ($k != -1)
		{
		if ($k->{owner} eq $USER->{username})
			{ return 1; }
		if ($k->{public} == 1 && $t->{private} != 2)
			{ return 1; }
		if (check_key($k->{ops}, $USER->{id}))
			{ return 1; }
		}
	return 0;
	}

sub check_participation
	{
	my ($files, $comments) = @_;
	foreach my $f (@$files)
		{
		return 2 if ($f->{username} eq $USER->{username});
		}
	foreach my $c (@$comments)
		{
		return 1 if ($c->{username} eq $USER->{username});
		}
	return 0;
	}

sub check_keyword
	{
	my ($k) = @_;
	if ($k != -1)
		{
		print "keyword: $k->{keyword}<br>owner: $k->{owner}<br>" if ($DEBUG);
		print "ops: $k->{ops}<br>" if ($DEBUG);
		print "public: $k->{public}<br>" if ($DEBUG);
		if ($k->{public} == 1)
			{ return 1; }
		return 0 if ($USER == -1);
		if ($k->{owner} eq $USER->{username})
			{ return 1; }
		if (check_key($k->{ops}, $USER->{id}))
			{ return 1; }
		}
	return 0;
	}
sub check_op
	{
	my ($k) = @_;
	if ($k != -1)
		{
		print "keyword: $k->{keyword}<br>owner: $k->{owner}<br>" if ($DEBUG);
		print "ops: $k->{ops}<br>" if ($DEBUG);
		print "public: $k->{public}<br>" if ($DEBUG);
		if ($k->{owner} eq $USER->{username})
			{ return 1; }
		if (check_key($k->{ops}, $USER->{id}))
			{ return 1; }
		if ($k->{public} == 1)
			{ return 0; }
		}
	return 0;
	}

sub user_checkerboard
	{
	my ($selected, $skip, $owner) = @_;
	my $users = get_all_users((time - 2*28*24*3600));
	my $i = 0;
	my $j = 0;
	my $r = 0;

	print qq!<table border=1 cellpadding=3 cellspacing=0>!;

	foreach my $duder (sort { $a->{username} cmp $b->{username} } @$users)
		{
		next if (check_key($skip, $duder->{id}));
		$checked = check_key($selected, $duder->{id});

		print qq[<tr>\n] if ($j == 0);
		print qq[<td class="row$r" nobreak><nobr>];
		print qq[<input type="checkbox" name="user$i" value="$duder->{username}"];
		print " checked" if ($checked);
		print qq[>&nbsp;<a href="$BUCKY/profile/$duder->{username}" class="quietlink">$duder->{username}</a>];
		print qq[</nobr></td>\n];
		print qq[</tr>\n] if ($j == 3);

		$r = $r ? 0 : 1;
		$r = $j == 3 ? int(!$r) : $r;
		$j = $j == 3 ? 0 : $j+1;
		$i++;
		$checked = 0;
		}

	print "</table>\n";
	}

sub update_whitelist
	{
	my $whitelist = make_whitelist();
	if ($whitelist eq " ")
		{ print "whitelist cleared<br>"; }
	else
		{ print "new whitelist: $whitelist<br>"; }
	switch_whitelist($id, $whitelist);
	return $whitelist;
	}

sub make_whitelist
	{
	my $whitelist = " ";
	foreach my $name (corral($input, "user"))
		{
		my $nextid = get_uid($name);
		$whitelist .= $nextid." ";
		}
	return $whitelist;
	}

1;