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

#                                      Copyright 2025 WebPros International, LLC
#                                                           All rights reserved.
# copyright@cpanel.net                                         http://cpanel.net
# This code is subject to the cPanel license. Unauthorized copying is prohibited.

package scripts::builddovecotconf;

use cPstrict;
use Try::Tiny;

use Cpanel::Config::LoadCpConf        ();
use Cpanel::AdvConfig                 ();
use Cpanel::AdvConfig::dovecot        ();
use Cpanel::AdvConfig::dovecotSNI     ();
use Cpanel::AdvConfig::dovecotSSL     ();
use Cpanel::AdvConfig::dovecot::utils ();
use Cpanel::Usage                     ();
use Cpanel::FileUtils::TouchFile      ();
use Cpanel::Autodie                   ();
use Cpanel::FileUtils::Access         ();
use Cpanel::Mkdir                     ();
use Cpanel::Rand                      ();
use Cpanel::Rand::Get                 ();
use Cpanel::Dovecot                   ();
use DBI                               ();
use DBD::SQLite                       ();
use Cpanel::DBI::SQLite               ();
use Cpanel::LoadModule                ();

our $CONF_PERMS = 0644;
our $itcd_file  = '/var/cpanel/imap_tcp_check_disabled';

__PACKAGE__->script(@ARGV) unless caller();

sub script ( $class, @args ) {
    my ( $force, $leave_broken, $now ) = ( 0, 0, time() );

    Cpanel::Usage::wrap_options(
        \@args, \&usage,
        {
            'force'        => \$force,
            'leave-broken' => \$leave_broken,
        },
    );

    my $cpconf_ref = Cpanel::Config::LoadCpConf::loadcpconf();

    if ( $> != 0 ) {
        die "Insufficient permissions to rebuild dovecot.conf";
    }
    my $dovecot_conf = Cpanel::AdvConfig::dovecot::utils::find_dovecot_conf();

    my $test_dovecot_conf = Cpanel::Rand::get_tmp_file_by_name($dovecot_conf);
    die 'Failed to get a temporary working file!' if ( $test_dovecot_conf eq '/dev/null' );
    chmod( $CONF_PERMS, $test_dovecot_conf ) or die "Could not set permissions on $test_dovecot_conf: $!";

    # make sure the local template is valid
    _check_local_template() if !$leave_broken;

    # It is a good idea to load "our" config and process any changes *before*
    # we rebuild "their" config.
    my $conf_hr = Cpanel::AdvConfig::dovecot::get_config();
    if ( $conf_hr->{'protocols'} =~ /imap(\s|$)/ ) {
        unlink $itcd_file;    # Doesn't matter if it does not exist
    }
    else {
        Cpanel::FileUtils::TouchFile::touchfile('/var/cpanel/imap_tcp_check_disabled');
    }

    # Check if conf values need updating for this upgrade.
    # use save_config as otherwise the changes don't persist in the UI, etc.
    # save_config also processes config changes, so we should invoke that
    # instead of merely process_config_changes.
    # *AMAZINGLY*, this saves a *whole lot more* keys than say whostmgr's UI
    # will save, though that's a consequence of it building config entirely
    # based off the formref instead of augmenting/replacing the existing
    # configuration.
    # This may in fact be a bug in that UI, but is longstanding behavior.
    # All that said, I'm not sure I'm a fan of some of the keys this adds,
    # as things like legacy_wildcard_safe and uniq just seem like garbage.
    Cpanel::AdvConfig::dovecot::save_config();

    my $values_to_change = _generate_config_and_check_syntax( $force, $test_dovecot_conf, $dovecot_conf, $leave_broken );

    # If dovecot complained certain values are too low, we need to adjust them
    if ( scalar keys %$values_to_change ) {
        _generate_config_and_check_syntax( $force, $test_dovecot_conf, $dovecot_conf, $leave_broken, $values_to_change );
    }

    _setup_dovecot_dirs();
    _setup_sqlite_dbs();

    rename $test_dovecot_conf, $dovecot_conf or do {
        warn "Failed to install $dovecot_conf: $!";
    };
    unlink $dovecot_conf . '.datastore';    # Just in case

    _build_includes();

    # Test the config one more time, as the includes may be invalid.
    my @status = Cpanel::AdvConfig::dovecot::check_syntax($dovecot_conf);
    if ( !$status[0] ) {
        print "Configuration test failed. Error details below:\n" . "Status: $status[0]\n" . "$status[1]\n";
        return 0;
    }

    return 1;
}

sub _build_includes {

    for my $include ( 'dovecotSSL', 'dovecotSNI' ) {

        try {
            my $module = "Cpanel::AdvConfig::$include";
            Cpanel::LoadModule::load_perl_module($module);
            $module->new()->rebuild_conf();
        }
        catch {
            warn "The system failed to rebuild Dovecot’s $include configuration file:\n$_";
        };
    }

    return 1;
}

sub _generate_config_and_check_syntax {
    my ( $force, $test_dovecot_conf, $dovecot_conf, $leave_broken, $values_to_change ) = @_;

    my $config_opts_hr = { 'service' => 'dovecot', 'force' => $force, '_target_conf_file' => $test_dovecot_conf };
    if ( $values_to_change and ref $values_to_change eq 'HASH' ) {
        $config_opts_hr->{'values_to_change'} = $values_to_change;
    }

    my ( $returnval, $message ) = Cpanel::AdvConfig::generate_config_file($config_opts_hr);
    if ( !$returnval ) {
        print "Failed to build $dovecot_conf\n$message\n";
        unlink $test_dovecot_conf;
        exit 1;
    }

    ( $returnval, $message, my $new_values_to_change ) = Cpanel::AdvConfig::dovecot::check_syntax($test_dovecot_conf);

    if ( !$returnval ) {
        print <<"EOM";
Configuration generation failed with the following message:

$message

EOM
        unless ($force) {
            unlink $test_dovecot_conf unless ($leave_broken);
            exit 1;
        }
    }

    return $new_values_to_change;
}

sub usage {
    print <<EO_USAGE;
Usage: builddovecotconf [options]

    Options:
      --help          Brief help message
      --force         Force installation of new conf file even if syntax check fails
      --leave-broken  Leave broken dovecot.conf on the disk so that it can be manually examined
EO_USAGE
    exit 0;
}

# Check the local template to make sure it is valid
sub _check_local_template {

    my %results;
    my $do_short_circuit = 1;

    for my $module_short (qw/dovecot dovecotSNI dovecotSSL/) {
        my $module = "Cpanel::AdvConfig::$module_short";

        # If we are a class, pass an object as the first argument:
        my @args_prefix;
        if ( $module->can('new') ) {
            $results{$module_short}->{'obj'} = $module->new();
            push @args_prefix, $results{$module_short}->{'obj'};
        }

        my ( $valid_or_not_found, @errs ) = $module->can('check_if_local_template_is_valid')->(@args_prefix);
        $do_short_circuit &&= $valid_or_not_found;    # If anything is invalid, don't return early.
        $results{$module_short}->@{ 'valid_or_not_found', 'errs' } = ( $valid_or_not_found, [@errs] );

        # If the main template is invalid, force all valid (and thus present) templates to be invalid too:
        if ( $module_short ne 'dovecot' && $module->can('has_local_template')->(@args_prefix) && !$results{'dovecot'}->{'valid_or_not_found'} ) {
            $results{$module_short}->{'valid_or_not_found'} = 0;
            push $results{$module_short}->{'errs'}->@*, 'Parent configuration file is invalid, so assuming included config file is invalid too.';
        }
    }

    return 1 if $do_short_circuit;

    for my $module_short ( keys %results ) {
        my $module = "Cpanel::AdvConfig::$module_short";

        # Skip if not invalid:
        next if $results{$module_short}->{'valid_or_not_found'};

        # Again, if we are a class, pass an object as the first argument:
        my @args_prefix;
        if ( defined $results{$module_short}->{'obj'} ) {
            push @args_prefix, $results{$module_short}->{'obj'};
        }

        my ( $local_template, $error ) = $module->can('get_template_file')->(@args_prefix);
        if ( !$local_template ) {
            print $error . "\n";
            next;
        }

        my $attempts        = 1;
        my $broken_template = _generate_broken_local_template_name($local_template);
        while ( -e $broken_template && $attempts < 11 ) {
            sleep(1);
            $broken_template = _generate_broken_local_template_name($local_template);
        }

        if ( -e $broken_template ) {
            print "The local template file '$local_template' is invalid, but the system was unable to determine an unused filename to rename it to.\n";
            next;
        }

        print "The local template file '$local_template' is invalid. The system will rename it to $broken_template.\n";

        # yes, there is a small race condition here, but I'm betting we never hit it unless we start calling this script a lot more
        rename $local_template, $broken_template;

        # FIXME: Getting up to three iContact notices about the same thing is probably more annoying than it should be.
        $module->can('send_icontact')->( @args_prefix, $broken_template, $results{$module_short}->{'errs'}->@* );
    }

    return;
}

sub _generate_broken_local_template_name {
    my ($local_template) = @_;

    return $local_template . '.broken.' . time . '.' . Cpanel::Rand::Get::getranddata(16);
}

sub _setup_dovecot_dirs {
    Cpanel::Mkdir::ensure_directory_existence_and_mode( $Cpanel::Dovecot::CP_DOVECOT_STORAGE, 0770 );
    Cpanel::FileUtils::Access::ensure_mode_and_owner( $Cpanel::Dovecot::CP_DOVECOT_STORAGE, 0770, 'dovecot' );
    Cpanel::Mkdir::ensure_directory_existence_and_mode( $Cpanel::Dovecot::LASTLOGIN_DIR, 0700 );
    Cpanel::FileUtils::Access::ensure_mode_and_owner( $Cpanel::Dovecot::LASTLOGIN_DIR, 0700, 'dovecot' );
    return 1;
}

sub _setup_sqlite_dbs {
    Cpanel::Autodie::unlink_if_exists($Cpanel::Dovecot::SQLITE_LASTLOGIN_DB_FILE);

    return 1;
}

1;
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