<?
/**
 * ThunderbirdJunkLogToPostfixHeaderCheck
 * Copyright (C) 2009 Basilio Briceno Hernandez <hide@address.com>
 *
 * ThunderbirdJunkLogToPostfixHeaderCheck is free software: you can redistribute
 * it and/or modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation, version 3 of the License.
 *
 * ThunderbirdJunkLogToPostfixHeaderCheck is distributed in the hope that it
 * will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with ThunderbirdJunkLogToPostfixHeaderCheck.
 * If not, see <http://www.gnu.org/licenses/lgpl.html>.
 */

/**
 * Provides a way to convert the Mozilla Thunderbird's JunkLog into a Postfix's header_check file
 *
 * @author Basilio Briceno <hide@address.com>
 * @license http://www.gnu.org/licenses/lgpl.html
 * @copyright Copyright (c) 2009, Basilio Briceno
 * @version 1.0
 */
class ThunderbirdJunkLogToPostfixHeaderCheck {

  /**
   * @var string Junklog's location
   */
  public $junklog;

  /**
   * Sets the location of the junklog
   */
  public function __construct ( $junklog )
  {
    $this->junklog = $junklog;
  }

  /**
   * Parses the junklog and returns the headercheck string
   *
   * @return string
   */
  public function parse ()
  {
    $file = file_get_contents( $this->junklog );
    preg_match_all( '/.*\-\s(.*)\sat\s(.*)$/m', $file, $match );
    unset( $file );

    $array = array_unique( $match[1] );
    unset( $match );

    $response = '';
    foreach( $array as $item ) {
      $response .= '/^Subject: ' . self::clearString( $item ) .
                   "/\tREJECT Your email is considered SPAM.\n";
    }
    return $response;
  }

  /**
   * Returns the parsed junklog
   *
   * @return string
   */
  public function getParsedJunkLog ()
  {
    return $this->parse();
  }

  /**
   * Write headercheck into file
   *
   * @param $path
   */
  public function writeParsedJunkLog ( $path )
  {
    if ( !is_writable( $path ) ) {
      return false;
    }
    if ( !file_put_contents( $path, $this->parse() ) ) {
      return false;
    }
    return true;
  }

  /**
   * Clear string from special characters
   *
   * @param string $log
   * @return string
   */
  public static function clearString ( $log )
  {
    $str = str_replace( '$', '\$', $str );
    $str = str_replace( '?', '\?', $str );
    $str = str_replace( '!', '\!', $str );
    $str = str_replace( '-', '\-', $str );
    $str = str_replace( '*', '\*', $str );
    $str = str_replace( '#', '\#', $str );
    $str = str_replace( "'", '\'', $str );
    $str = str_replace( '"', '\"', $str );
    $str = str_replace( '(', '\(', $str );
    $str = str_replace( ')', '\)', $str );
    $str = str_replace( '&', '\&', $str );
    $str = str_replace( '.', '\.', $str );
    $str = str_replace( '=', '\=', $str );
    $str = str_replace( '[', '\[', $str );
    $str = str_replace( ']', '\]', $str );
    $str = str_replace( '{', '\{', $str );
    $str = str_replace( '}', '\}', $str );
    $str = str_replace( '~', '\~', $str );
    return str_replace( '/', '\/', $str );
  }
}