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

# cpanel - scripts/email_archive_maintenance       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::email_archive_maintenance;

use strict;
use warnings;

use Cpanel::Config::LoadCpConf ();
use Cpanel::PwCache::Helpers   ();
use Cpanel::FileUtils::Write   ();
use Cpanel::LoadFile           ();
use Cpanel::Logger             ();
use Cpanel::Usage              ();
use Cpanel::Unix::PID::Tiny    ();

use Try::Tiny;

my $pidfile = '/var/run/email_archive_maintenance.pid';

my $MAX_FAILURES_BEFORE_SKIP = 5;
my $MAX_CFG_SIZE             = 32768;

if ( !caller() ) {
    run(@ARGV);
}

sub run {
    my (@args) = @_;

    my $debug   = 0;
    my $verbose = 0;

    my $opts = {
        'debug'   => \$debug,
        'verbose' => \$verbose,
    };

    Cpanel::Usage::wrap_options( \@args, \&usage, $opts );

    my $upid = Cpanel::Unix::PID::Tiny->new();

    if ( !$upid->pid_file($pidfile) ) {
        my $pid = $upid->get_pid_from_pidfile($pidfile);
        print "Another instance of $0 appears to be running at PID '$pid'.\n";
        exit 1;
    }

    $Cpanel::Email::Archive::VERBOSE = 1 if $verbose;

    my $maintenance = scripts::email_archive_maintenance->new();
    $maintenance->{'opts'} = $opts;

    $maintenance->script();

    return;
}

sub usage {
    my $prog = $0;
    print <<USAGE;
Usage: $prog
Run email archive maintenance

    --help      Display this documentation

    --verbose   Show information about the archive maintenance

Sample usages
    Initiate maintenance processing of each user's email archive
    > $prog
USAGE
    exit 1;
}

sub new {
    my $self = bless {}, __PACKAGE__;

    return $self;
}

sub script {
    my $self = shift;

    my $logger     = Cpanel::Logger->new();
    my $cpconf_ref = Cpanel::Config::LoadCpConf::loadcpconf();
    if ( !$cpconf_ref->{'emailarchive'} ) {
        $logger->info('Email archiving is disabled per Tweak Settings.');
        exit;
    }

    my $email_archive_last_run_fname = '/var/cpanel/email_archive_last_run';
    my $email_archive_last_run;
    if ( -e $email_archive_last_run_fname ) {
        $email_archive_last_run = Cpanel::LoadFile::loadfile($email_archive_last_run_fname);
        $email_archive_last_run =~ s/^\s+//;
        $email_archive_last_run =~ s/\s+$//;
    }

    require Cpanel::IONice;
    if ( Cpanel::IONice::ionice( 'best-effort', exists $cpconf_ref->{'ionice_email_archive_maintenance'} ? $cpconf_ref->{'ionice_email_archive_maintenance'} : 7 ) ) {
        print "[email_archive_maintenance] Setting I/O priority to reduce system load: " . Cpanel::IONice::get_ionice() . "\n";
    }

    require Cpanel::OSSys;
    Cpanel::OSSys::nice(10);

    require Cpanel::UserIterator;
    require Cpanel::AccessIds::ReducedPrivileges;
    require Cpanel::Email::Archive;

    {
        no warnings 'once';
        $Cpanel::Email::Archive::VERBOSE = 1;
    }

    Cpanel::PwCache::Helpers::no_uid_cache();    #uid cache only needed if we are going to make lots of getpwuid calls

    my $userit = Cpanel::UserIterator->new( 'cpanel_only' => 1 );

    my $email_archive_types_hashref = Cpanel::Email::Archive::fetch_email_archive_types();
    my @email_archive_types         = sort keys %{$email_archive_types_hashref};

    while ( my $pwref = $userit->pwref() ) {
        my $user    = $userit->user();
        my $homedir = $userit->homedir();
        my @domains = @{ $userit->domains() };
        my %archive_enabled;

        print qq{Processing $user...\n} if $self->{'opts'}{'verbose'};

        foreach my $domain (@domains) {
            foreach my $archive_type (@email_archive_types) {
                $archive_enabled{$domain}{$archive_type} = 1 if ( -e "$homedir/etc/$domain/archive/$archive_type" );
            }
        }
        if ( keys %archive_enabled ) {
            my $ret = Cpanel::AccessIds::ReducedPrivileges::call_as_user(
                sub {
                    for my $domain ( keys %archive_enabled ) {
                        my %retention_periods;
                        foreach my $archive_type (@email_archive_types) {
                            if ( $archive_enabled{$domain}{$archive_type} ) {
                                if ( open( my $cfg_fh, '<', "$homedir/etc/$domain/archive/$archive_type" ) ) {
                                    my $data;
                                    read( $cfg_fh, $data, $MAX_CFG_SIZE );
                                    my %CFG = map { ( split( /:\s+/, $_, 2 ) )[ 0, 1 ] } split( /\n/, $data );
                                    $retention_periods{$archive_type} = $CFG{'retention_period'};
                                }
                            }
                        }

                        try {
                            Cpanel::Email::Archive::purge_archives_outside_retention_period( $user, $homedir, $domain, \%retention_periods ) if keys %retention_periods;
                            Cpanel::Email::Archive::recalculate_disk_usage( $user, $homedir, $domain, $email_archive_last_run )              if keys %retention_periods;
                        }
                        catch {
                            warn $_ if defined $_;
                        };

                        my ( $status, $statusmsg, $failcount, $failref ) = Cpanel::Email::Archive::create_archive_maildirs( $user, $homedir, $domain, \%retention_periods, $email_archive_last_run, undef, $MAX_FAILURES_BEFORE_SKIP );
                        if ( $status == -1 ) {    #fatal event (disk quota exceeded usually)
                            print "[$user/$domain]: $statusmsg\n" . ( $failref ? ( "\t" . join( "\n\t", @{$failref} ) . "\n" ) : '' );
                            return [ $status, $statusmsg, $failcount ];
                        }
                    }
                    return [ 1, "Completed" ];
                },
                $user
            );
        }
        $userit->next();
    }

    Cpanel::FileUtils::Write::overwrite_no_exceptions( $email_archive_last_run_fname, time(), 0600 );

    return;
}

1;