<?php
// =====================================================================
// Script to delete NinjaFirewall's Pro/Pro+ older logs. You can run it
// from a cron job e.g. `12 0 * * * /usr/bin/php /foo/bar/this_script.php`
// =====================================================================
// More info at http://nin.link/gdpr/
// =====================================================================
// Enter the full path to NinjaFirewall's log folder (no trailing slash):
$nf_log_folder = '/foo/bar/nfwlog';
// Enter how many days you want to keep the logs. Any log older than
// that will be deleted:
$max_days = '45';
// =====================================================================

// Convert to seconds:
$max_days *= 86400;
// Today's date:
$now = time();
// Retrieve the list of all logs:
$glob = glob( $nf_log_folder . '/firewall_*.php' );
if ( is_array( $glob ) ) {
   foreach( $glob as $file ) {
      $lines = array();
      $lines = file( $file, FILE_SKIP_EMPTY_LINES );
      foreach( $lines as $k => $line ) {
         if ( preg_match( '/^\[(\d{10})\]/', $line, $match ) ) {
            if ( $now - $max_days > $match[1] ) {
               // This line is too old, remove it:
               unset( $lines[$k] );
            }
         } else {
            // Not a firewall log line:
            unset( $lines[$k] );
         }
      }
      if ( empty( $lines ) ) {
         // No lines left, delete the file:
         unlink( $file );
      } else {
         // Save the last preserved lines to the log:
         $fh = fopen( $file,'w' );
         fwrite( $fh, "<?php exit; ?>\n" );
         foreach( $lines as $line ) {
            fwrite( $fh, $line );
         }
         fclose( $fh );
      }
   }
}

// =====================================================================
// EOF