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

# cpanel - scripts/remove_dovecot_index_files      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::remove_dovecot_index_files;

use strict;

use File::Find   ();
use File::Spec   ();
use Getopt::Long ();

use Cpanel::Config::LoadCpConf           ();
use Cpanel::PwCache                      ();
use Cpanel::Reseller                     ();
use Cpanel::Config::Users                ();
use Cpanel::Config::LoadUserOwners       ();
use Cpanel::AccessIds::ReducedPrivileges ();

exit run(@ARGV) unless caller();

my $verbose = 0;

sub run {
    my @cmdline_args = @_;
    return usage(1) if !@cmdline_args;

    unless ( $> == 0 && $< == 0 ) {
        return usage( 1, "[!] This program can only be run by root!\n" );
    }

    my $opts = {};
    Getopt::Long::GetOptionsFromArray(
        \@cmdline_args,
        'all'         => \$opts->{'all'},
        'reseller=s@' => \$opts->{'reseller'},
        'user=s@'     => \$opts->{'user'},
        'verbose'     => \$verbose,
        'help|h'      => \$opts->{'help'},
    );

    return usage(0) if $opts->{'help'};

    my $cpconf_ref = Cpanel::Config::LoadCpConf::loadcpconf();
    if ( $cpconf_ref->{'mailserver'} ne 'dovecot' ) {
        return usage( 1, "[!] The configured mailserver is not Dovecot. Action aborted.\n" );
    }

    return process_all_users_on_server()    if $opts->{'all'};
    process_reseller( $opts->{'reseller'} ) if $opts->{'reseller'} && scalar @{ $opts->{'reseller'} };
    process_cpanel_user( $opts->{'user'} )  if $opts->{'user'}     && scalar @{ $opts->{'user'} };

    return 0;
}

sub process_cpanel_user {
    my $cpusers_to_process = shift;

    my ( $index, $total ) = ( 1, scalar @{$cpusers_to_process} );
    foreach my $cpuser ( @{$cpusers_to_process} ) {
        print "[*] ($index/$total) Processing cPanel user: '$cpuser' …\n";

        $index++;
        my $homedir = Cpanel::PwCache::gethomedir($cpuser);
        my $maildir = File::Spec->catfile( $homedir, 'mail' );
        if ( !-d $maildir ) {
            print "[!] User's maildir was not found: $maildir - $!\n";
            next;
        }

        my $maxdepth                 = File::Spec->splitdir($maildir) + 4;
        my $purge_index_files_codref = sub {
            File::Find::find(
                {
                    'wanted' => sub {

                        # Dovecot index files are in "$homedir/mail/domain.tld/emailuser/<dirname>".
                        # So we limit the depth here to what was determined above.
                        return if File::Spec->splitdir($File::Find::name) > $maxdepth;

                        # Remove files that match:
                        # dovecot.index
                        # dovecot.index.cache
                        # dovecot.index.log
                        # dovecot.index.log.\d+ (rotated log files)
                        return if $_ !~ m/^dovecot\.index(\.cache|\.log(\.\d+)?)?$/;

                        print "Unlinking '$File::Find::name' …\n" if $verbose;

                        if ( -e $File::Find::name && -f $File::Find::name ) {
                            unlink $File::Find::name or print "Failed to unlink '$File::Find::name': $!\n";
                        }
                    },
                    'no_chdir'    => 0,    # default, but setting to be explicit about the usage.
                    'follow_skip' => 2,    # ignore any duplicate files and directories
                },
                $maildir
            );
        };
        eval { Cpanel::AccessIds::ReducedPrivileges::call_as_user( $purge_index_files_codref, $cpuser ) };

        print "[+] '$cpuser' processed.\n";
    }
    return;
}

sub process_reseller {
    my $resellers_to_process = shift;

    foreach my $reseller ( @{$resellers_to_process} ) {
        print "[*] Processing Reseller: '$reseller' …\n";
        if ( !Cpanel::Reseller::isreseller($reseller) ) {
            print "[!] '$reseller' is not reseller.\n\n";
            next;
        }

        my $owners_hr = Cpanel::Config::LoadUserOwners::loadtrueuserowners( {} );
        if ( !( $owners_hr->{$reseller} && 'ARRAY' eq ref $owners_hr->{$reseller} ) ) {
            print "[!] Failed to fetch list of accounts owned by reseller, '$reseller'.\n\n";
            return;
        }

        print "\n";
        process_cpanel_user( $owners_hr->{$reseller} );
        print "\n";
    }

    return;
}

sub process_all_users_on_server {
    my $cpusers = Cpanel::Config::Users::getcpusers();
    if ( !( $cpusers && 'ARRAY' eq ref $cpusers ) ) {
        print "[!] Failed to fetch list of cPanel accounts on server.\n";
        return;
    }

    print "[*] Processing all cPanel users on the server …\n\n";
    process_cpanel_user($cpusers);
    print "\n[+] Finished processing all cPanel users on the server.\n";

    return 0;
}

sub usage {
    my ( $retval, $msg ) = @_;
    my $fh = $retval ? \*STDERR : \*STDOUT;

    if ( !defined $msg ) {
        $msg = <<USAGE;
$0

Utility to remove Dovecot index files. Available options:

    --user [cPanel username]

        Remove Dovecot index files from all email accounts setup under the specified cPanel user.
        Can be specified more than once, to process multiple users at once.

    --reseller [reseller username]

        Remove Dovecot index files from all email accounts setup under all the cPanel accounts owned by the specified Reseller.
        Can be specified more than once, to process multiple resellers at once.

    --all

        Remove Dovecot index files from all email accounts setup on the server.

    --verbose

        Prints the full paths of the files being removed.

    --help

        Prints this help text.
USAGE
    }

    print {$fh} $msg;
    return $retval;
}

1;