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#!/usr/bin/perl -w

use strict;
use Template;
use Net::LDAP;
use File::Slurp;
use YAML qw/LoadFile/;
use LWP::UserAgent;

my $config_file = '/etc/mgapeople.conf';
my $config = LoadFile($ENV{MGAPEOPLE_CONF} ?  $ENV{MGAPEOPLE_CONF} : $config_file);

my %maintdb;
my %groups;
my %users;

sub process_template {
    my ($template, $src, $vars, $dest) = @_;
    for my $extension (@{$config->{output_format}}) {
        next unless -f "$config->{tmpl_dir}/$src.$extension";
        $template->process("$src.$extension", $vars, "$dest.$extension");
    }
}

sub loadmaintdb {
    return unless $config->{maintdburl};
    my $ua = LWP::UserAgent->new;
    my $r = $ua->get($config->{maintdburl});
    return unless $r->is_success;
    for my $line (split /^/, $r->decoded_content) {
        my ($pkg, $user) = split ' ', $line;
        push @{$maintdb{$user}}, $pkg;
    }
}

sub loaduser {
    my ($ldap, $user) = @_;
    my $m = $ldap->search(
        base   => $user,
        scope  => 'base',
        filter => '(objectClass=inetOrgPerson)',
    );
    die $m->error if $m->is_error;
    my $res = $m->as_struct;
    if (exists $res->{$user}) {
        $res->{$user}->{groups} = [];
        $users{$user} = $res->{$user};
    }
}

sub loadgroups {
    my ($ldap) = @_;
    my $m = $ldap->search(
        base   => $config->{groupbase},
        filter => '(objectClass=groupOfNames)',
    );
    die $m->error if $m->is_error;
    my $res = $m->as_struct;
    for my $groupname (keys %$res) {
        $groups{$groupname} = $res->{$groupname};
        for my $user (@{$groups{$groupname}->{member}}) {
            loaduser($ldap, $user) unless exists $users{$user};
            if (exists $users{$user}) {
                push @{$users{$user}->{groups}}, $groupname;
            }
        }
        $res->{$groupname}->{member} =
            [ grep { exists $users{$_} } @{$groups{$groupname}->{member}} ];
    }
}

sub output_users {
    my $template = Template->new({
        INCLUDE_PATH => $config->{tmpl_dir},
        OUTPUT_PATH => "$config->{output_dir}/u",
    });
    for my $user (keys %users) {
        my $vars = {
            config  => $config,
            user    => $user,
            users   => \%users,
            groups  => \%groups,
            maintdb => \%maintdb,
        };
        my $uid = $users{$user}->{uid}->[0];
        process_template($template, 'user', $vars, $uid);
    }

    my $vars = {
        config  => $config,
        users   => \%users,
        groups  => \%groups,
        maintdb => \%maintdb,
    };
    process_template($template, 'userindex', $vars, 'index');
}

sub output_groups {
    my $template = Template->new({
        INCLUDE_PATH => $config->{tmpl_dir},
        OUTPUT_PATH => "$config->{output_dir}/g",
    });
    for my $group (keys %groups) {
        my $vars = {
            config  => $config,
            group   => $group,
            users   => \%users,
            groups  => \%groups,
            maintdb => \%maintdb,
        };
        my $cn = $groups{$group}->{cn}->[0];
        process_template($template, 'group', $vars, $cn);
    }

    my $vars = {
        config  => $config,
        users   => \%users,
        groups  => \%groups,
        maintdb => \%maintdb,
    };
    process_template($template, 'groupindex', $vars, 'index');
}

sub output_index {
    my $template = Template->new({
        INCLUDE_PATH => $config->{tmpl_dir},
        OUTPUT_PATH => "$config->{output_dir}",
    });
    my $vars = {
        config  => $config,
        users   => \%users,
        groups  => \%groups,
        maintdb => \%maintdb,
    };
    process_template($template, 'index', $vars, 'index');
}

my $bindpw = read_file($config->{bindpwfile});
chomp $bindpw;
my $ldap = Net::LDAP->new($config->{ldapserver}) or die "$@";
my $m;
$m = $ldap->start_tls(verify => 'none');
die $m->error if $m->is_error;
$m = $ldap->bind($config->{binddn}, password => $bindpw);
die $m->error if $m->is_error;
loadmaintdb;
loadgroups($ldap);
output_users();
output_groups();
output_index();