#!/usr/local/cpanel/3rdparty/bin/perl

# cpanel - scripts/exim_tidydb                     Copyright 2022 cPanel, L.L.C.
#                                                           All rights reserved.
# copyright@cpanel.net                                         http://cpanel.net
# This code is subject to the cPanel license. Unauthorized copying is prohibited

package scripts::exim_tidydb;

use strict;
use warnings;

use File::Glob                           ();
use File::Basename                       ();
use Umask::Local                         ();
use Cpanel::Autodie                      ();
use Cpanel::FileUtils::TouchFile         ();
use Cpanel::NameVariant                  ();
use Cpanel::Time::ISO                    ();
use Cpanel::Binaries                     ();
use Cpanel::SafeRun::Object              ();
use Cpanel::AccessIds::ReducedPrivileges ();

our @exim_dirs = qw(/var/spool/exim_incoming /var/spool/exim);

use constant VALID_STATIC_DB_NAMES => (
    'retry',
    'misc',
    'callout',
    'ratelimit',
);

__PACKAGE__->script() unless caller();

sub script {

    my $exim_tidydb = Cpanel::Binaries::path('exim_tidydb');
    if ( !-x $exim_tidydb ) { die 'Cannot find exim_tidydb'; }

    foreach my $dir (@exim_dirs) {
        next if ( !-d $dir );
        my @dbs = File::Glob::bsd_glob("$dir/db/*");
        foreach my $db (@dbs) {
            my $basedb = File::Basename::basename($db);
            next if ( $basedb =~ /^\.|\.lock(file)?$/ );

            # Valid database names = retry | misc | wait-<transport-name> | callout | ratelimit
            my $is_valid = grep { $_ eq $basedb } VALID_STATIC_DB_NAMES();
            $is_valid ||= $basedb =~ m{^wait-};
            next if !$is_valid;

            my $dbpath = "$dir/db/$basedb";
            my $lock   = "$dbpath.lockfile";
            unless ( -e $lock ) {
                my $privs = Cpanel::AccessIds::ReducedPrivileges->new(qw/mailnull mail/);
                my $umask = Umask::Local->new(027);
                Cpanel::FileUtils::TouchFile::touchfile($lock);
            }

            my $run = Cpanel::SafeRun::Object->new(
                'program' => $exim_tidydb,
                'args'    => [ ( $basedb eq 'ratelimit' ? ( '-t', '1d' ) : () ), $dir, $basedb ]
            );

            print $run->stdout();

            if ( $run->CHILD_ERROR() && $run->error_code() == 1 ) {
                my $new_filename = Cpanel::NameVariant::find_name_variant(
                    max_length => 254,
                    name       => $dbpath . '.broken.' . Cpanel::Time::ISO::unix2iso(),
                    test       => sub {
                        Cpanel::Autodie::link_if_no_conflict( $dbpath, $_[0] );
                    },
                );

                unlink $dbpath or warn "unlink($dbpath): $!";

                print "Renamed corrupt “$dbpath” to “$new_filename”.\n";
            }
        }
    }

    Cpanel::SafeRun::Object->new( 'program' => '/usr/local/cpanel/scripts/cleanmsglog' );
    return;
}

1;