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

# cpanel - scripts/cleansessions                   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::cleansessions;

use strict;
use warnings;

use Getopt::Long           ();
use Cpanel::PwCache        ();
use Cpanel::PwCache::Build ();
use Cpanel::Locale 'lh';

# Constants
use constant ONEDAY => 60 * 60 * 24;    # 24 hours - time in seconds

use constant MAX_PHP_SESSION_AGE => ONEDAY;    # 24 hours

use constant MAX_PASSRESET_SESSION_AGE => ONEDAY * 2;                            # 48 hours
use constant MAX_PASSRESET_FLOOD_AGE   => MAX_PASSRESET_SESSION_AGE + ONEDAY;    # 72 hours

use constant MAX_INVITE_SESSION_AGE => ONEDAY * 2;                               # 48 hours
use constant MAX_INVITE_FLOOD_AGE   => MAX_INVITE_SESSION_AGE + ONEDAY;          # 72 hours

our $flood_pattern = qr/^\.floodprotect-/;

sub RESET_DIR       { return '/var/cpanel/passreset' }
sub INVITE_DIR      { return '/var/cpanel/invites' }
sub TEAM_INVITE_DIR { return '/var/cpanel/team_invites' }

# Application state
our $VERBOSE = 0;
our $HELP    = 0;

run(@ARGV) unless caller;

sub run {
    my (@args) = @_;
    Getopt::Long::GetOptionsFromArray(
        \@args,
        verbose => \$VERBOSE,
        help    => \$HELP
    ) or _die_usage();

    _die_usage() if $HELP;

    Cpanel::PwCache::Build::init_passwdless_pwcache();

    clean_php_app_sessions();

    clean_password_reset_sessions();

    clean_invite_sessions();

    print "Done\n" if $VERBOSE;

    return;
}

sub clean_php_app_sessions {
    my $now = time();

    my @APPS = qw( horde phpmyadmin phppgadmin roundcube );
    foreach my $app (@APPS) {
        print lh()->maketext( 'Searching for “[_1]” sessions more than [quant,_2,day,days] old …', $app, MAX_PHP_SESSION_AGE / ONEDAY ) . "\n" if $VERBOSE;

        ## The correct name is e.g. cpanelroundcube without the dash.
        my $homedir = _gethomedir( 'cpanel' . $app );
        next if !$homedir;

        my $tmpdir = $homedir . '/tmp';

        opendir( my $session_files, $tmpdir )
          or next;

        while ( my $qf = readdir($session_files) ) {
            $qf =~ s/\///g;    #not really possible
            next if ( $qf !~ /^sess/ );
            my $abs_path = $tmpdir . '/' . $qf;
            my $mtime    = ( stat($abs_path) )[9];

            if ( $now - $mtime > MAX_PHP_SESSION_AGE() ) {
                remove($abs_path);
            }
        }
        closedir $session_files;
    }
    return;
}

sub clean_password_reset_sessions {
    print lh()->maketext( 'Searching for reset password sessions more than [quant,_1,day,days] old …', MAX_PASSRESET_SESSION_AGE / ONEDAY ) . "\n" if $VERBOSE;

    # Clean the session files: anything not matching .floodprotect-
    clean_expired_files( RESET_DIR, $flood_pattern, 1, MAX_PASSRESET_SESSION_AGE );

    print lh()->maketext( 'Searching for reset password flood control files more than [quant,_1,day,days] old …', MAX_PASSRESET_FLOOD_AGE / ONEDAY ) . "\n" if $VERBOSE;

    # Clean the flood control files: : anything matching .floodprotect-
    clean_expired_files( RESET_DIR, $flood_pattern, 0, MAX_PASSRESET_FLOOD_AGE );

    return;
}

sub clean_invite_sessions {

    print lh()->maketext( 'Searching for invitation sessions more than [quant,_1,day,days] old …', MAX_INVITE_SESSION_AGE / ONEDAY ) . "\n" if $VERBOSE;

    # Clean the session files: anything not matching .floodprotect-
    clean_expired_files( INVITE_DIR,      $flood_pattern, 1, MAX_INVITE_SESSION_AGE );
    clean_expired_files( TEAM_INVITE_DIR, $flood_pattern, 1, MAX_INVITE_SESSION_AGE );

    print lh()->maketext( 'Searching for invitation flood control files more than [quant,_1,day,days] old …', MAX_INVITE_FLOOD_AGE / ONEDAY ) . "\n" if $VERBOSE;

    # Clean the flood control files: : anything matching .floodprotect-
    clean_expired_files( INVITE_DIR,      $flood_pattern, 0, MAX_INVITE_FLOOD_AGE );
    clean_expired_files( TEAM_INVITE_DIR, $flood_pattern, 0, MAX_INVITE_FLOOD_AGE );

    return;
}

sub clean_expired_files {
    my ( $dir, $match, $not, $max_age ) = @_;
    my $now = time();
    if ( opendir my $dh, $dir ) {
        while ( my $item = readdir $dh ) {

            # skip these items, which are not sessions:
            #   . and ..
            next if $item =~ /^\.$|^\.\.$/;

            my $check = $not ? $item !~ $match : $item =~ $match;
            if ($check) {

                my $abs_path = $dir . '/' . $item;
                my $mtime    = ( stat $abs_path )[9];
                if ( $now - $mtime > $max_age ) {
                    remove($abs_path);
                }
            }
        }
        closedir $dh;
    }
}

sub remove {
    my ($abs_path) = @_;
    my $ok         = unlink $abs_path;
    my $err        = $!;
    if ( $ok && $VERBOSE ) {
        print "    " . lh()->maketext( 'The system removed “[_1]”.', $abs_path ) . "\n";
    }
    elsif ( !$ok ) {
        print STDERR "    " if $VERBOSE;
        print STDERR lh()->maketext( 'The system failed to remove “[_1]” because of the following error: [_2]', $abs_path, $err ) . "\n";
    }
    return;
}

sub _gethomedir {
    my ($user) = @_;
    return Cpanel::PwCache::gethomedir($user);
}

sub _die_usage {
    die <<EOF;
usage: $0 [--verbose] [--help]

Cleans up the various session files for the following:

 * application session files for the following apps if installed:
    - horde
    - phpmyadmin
    - phppgadmin
    - roundcube

 * expired cPanel Password Reset session files and flood protection files.

 * expired cPanel Subaccount Invitation session files and flood protection files.

If you specify --verbose, you will get detailed output indicating what files were
removed from the system.

If you specify --help, you will get this help output.
EOF
}