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

# cpanel - scripts/rebuild_dbmap                   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::rebuild_dbmap;

use strict;
use warnings;

use autodie;

use Getopt::Long qw(:config auto_help);
use Pod::Usage;

use YAML::Syck ();

use Cpanel::Autodie                      ();
use Cpanel::DB::Map                      ();
use Cpanel::DB::Map::Path                ();
use Cpanel::DB::Map::Rebuild::Mysql      ();    # PPI USE OK - dynamic usage
use Cpanel::DB::Map::Rebuild::Postgresql ();    # PPI USE OK - dynamic usage
use Cpanel::DB::Map::Remove              ();
use Cpanel::Time                         ();
use Cpanel::Config::HasCpUserFile        ();
use Cpanel::Services::Enabled            ();

my %pretty_engine_name = qw(
  MYSQL   MariaDB/MySQL
  PGSQL   PostgreSQL
);

my %engine_name_module = qw(
  MYSQL   Mysql
  PGSQL   Postgresql
);

my %engine_name_service = qw(
  MYSQL   mysql
  PGSQL   postgresql
);

script(@ARGV) if !caller;

sub script {
    my @script_args = @_;

    local $| = 1;

    my $noop = 0;
    Getopt::Long::GetOptionsFromArray( \@script_args, 'noop' => \$noop );

    my ($username) = @script_args;

    pod2usage(1) if !length $username || !Cpanel::Config::HasCpUserFile::has_cpuser_file($username);

    if ($noop) {
        print "Operating in no-op mode; no changes will be made to your system.\n\n";
    }

    print "Reading access rights for the cPanel user “$username” from live data:\n";

    my %new_data;
    for my $engine ( sort keys %pretty_engine_name ) {
        print " $pretty_engine_name{$engine} …";

        if ( !Cpanel::Services::Enabled::is_provided( $engine_name_service{$engine} ) ) {
            print " $pretty_engine_name{$engine} is disabled, skipping …\n";
            next;
        }

        my $module = "Cpanel::DB::Map::Rebuild::$engine_name_module{$engine}";
        $new_data{$engine} = $module->can('read_dbmap_data')->($username);
    }

    print " Done.\n\n";

    if ( !scalar keys %new_data ) {
        print "No active database engines were found, DB map will not be re-written.\n";
        return;
    }

    if ($noop) {
        print "Without the “--noop” flag, this script would generate and install\n";
        print "the following database map data:\n\n";
        print YAML::Syck::Dump( \%new_data );
    }
    else {
        my $path = Cpanel::DB::Map::Path::data_file_for_username($username);

        if ( -e $path ) {
            my $timestamp = sprintf(
                '%d-%02d-%02d_%02d:%02d:%02d_%d',
                reverse( ( Cpanel::Time::localtime() )[ 0 .. 5 ] ),
                $$,
            );

            my $backup_path = $path;
            $backup_path =~ s<[.][^./]+\z><>;    #strip off last extension in the filename
            $backup_path = "${backup_path}_backup_${timestamp}.json";

            Cpanel::Autodie::link( $path, $backup_path );

            print "Old DB map file backed up at:\n\t$backup_path\n\n";

            Cpanel::DB::Map::Remove::remove_cpuser($username);

            print "Old DB map file removed.\n\n";
        }

        print "Saving:";

        for my $engine ( sort keys %new_data ) {
            print " $pretty_engine_name{$engine} …";

            my $map   = Cpanel::DB::Map->new_allow_create( { db => $engine, cpuser => $username } );
            my $owner = $map->get_owner();

            for my $db ( keys %{ $new_data{$engine} } ) {
                $owner->add_db($db);
                for my $dbuser ( @{ $new_data{$engine}{$db} } ) {
                    $owner->add_dbuser( { dbuser => $dbuser } );
                    $owner->add_db_for_dbuser( $db, $dbuser );
                }
            }

            $map->save();
        }
        print " Done!\n\n";

        print "Rebuild complete.\n";
    }

    return;
}

=pod

=encoding utf-8

=head1 NAME

rebuild_dbmap - rebuild the database map

=head1 SYNOPSIS

    rebuild_dbmap [options] username

    Options:

        --noop   Print the DB map that this would create
                 without actually changing anything.

        --help   Print this message.

    NOTE: This script is EXPERIMENTAL. Use with caution!

=head1 DESCRIPTION

!!!! EXPERIMENTAL !!!!

B<rebuild_dbmap> will query the active database cluster(s) for the
currently active access rights, then (normally) write those to a
new database map file after having backed up the old one in
the operator’s home directory.

This should correctly restore the mapping of all databases with their
cPanel user and DB users. It does so by “harvesting” the databases to which
the cPanel user has access, then assigning other DB users who can access
those databases as the cPanel user’s DB users.

CAVEATS

=over 4

=item * This cannot recover DB users that don’t have access to at least one
database. Those DB users will still exist in the actual database,
of course, but the cPanel user will no longer have control of them via
cPanel or WHM.

=item * If, for some reason, two DB users, owned by B<different> cPanel users,
have access to a given database, and this script restores one of those
cPanel users’ DB maps, then the newly-restored DB map will indicate ownership
of BOTH DB users. For example: “cpuser1” has a DB user “john” who can
access “cpuser1”’s DB “stuff”. “cpuser2” has a DB user “jane” to whom you
have manually given access to “stuff” within the DB engine itself. (NOTE:
cPanel and WHM do not support this!) If, then, you run this script on
“cpuser1”, then “cpuser1” will own BOTH “john” and “jane”, since both of
those DB users have access to “cpuser1”’s DB “stuff”.

=back

=cut

1;
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