<?php
// $Revision: 1.1.4.1.2.4 $
// ------------------------------------------------------------------------- //
//  XooNIps - Neuroinformatics Base Platform System                          //
//  Copyright (C) 2005-2008 RIKEN, Japan All rights reserved.                //
//  http://xoonips.sourceforge.jp/                                           //
// ------------------------------------------------------------------------- //
//  This program is free software; you can redistribute it and/or modify     //
//  it under the terms of the GNU General Public License as published by     //
//  the Free Software Foundation; either version 2 of the License, or        //
//  (at your option) any later version.                                      //
//                                                                           //
//  You may not change or alter any portion of this comment or credits       //
//  of supporting developers from this source code or any supporting         //
//  source code which is considered copyrighted (c) material of the          //
//  original comment or credit authors.                                      //
//                                                                           //
//  This program 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 General Public License for more details.                             //
//                                                                           //
//  You should have received a copy of the GNU General Public License        //
//  along with this program; if not, write to the Free Software              //
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA //
// ------------------------------------------------------------------------- //
if ( ! defined( 'XOOPS_ROOT_PATH' ) ) {
  exit();
}

// class files
require_once XOOPS_ROOT_PATH.'/modules/xoonips/class/base/xmlparser.class.php';

/**
 * The Amazon Product Advertising API data handling class
 * @package xnpbook
 * @author  Yoshihiro OKUMURA <orrisroot@users.sourceforge.jp>,
 *          Masaya KINOSHITA
 */
class XooNIps_Amazon_ECS40 extends XooNIpsXMLParser {

  /**
   * parsed data
   * @var array
   * @access private
   */
  var $_data;

  /**
   * parsing condition
   * @var array
   * @access private
   */
  var $_condition = array();

  /**
   * isbn
   * @var string
   * @access private
   */
  var $_isbn = '';

  /**
   * secret access key for amazon API
   * @var string
   * @access private
   */
  var $_secret_access_key = '';

  function XooNIps_Amazon_ECS40() {
    // get module config
    $mydirname = basename( dirname( dirname( __FILE__ ) ) );
    $mhandler =& xoops_gethandler( 'module' );
    $module =& $mhandler->getByDirname( $mydirname );
    $chandler =& xoops_gethandler( 'config' );
    $mconfig = $chandler->getConfigsByCat( false, $module->mid() );

    // call parent constructor
    parent::XooNIpsXMLParser();
    // set fetcher conditions
    $this->_fetch_url = 'http://webservices.amazon.com/onca/xml';
    $this->_fetch_arguments['Service'] = 'AWSECommerceService';
    $this->_fetch_arguments['Version'] = '2007-07-16';
    $this->_fetch_arguments['Operation'] = 'ItemLookup';
    $this->_fetch_arguments['IdType'] = 'ISBN';
    $this->_fetch_arguments['SearchIndex'] = 'Books';
    $this->_fetch_arguments['ResponseGroup'] = 'Medium';
    $this->_fetch_arguments['AWSAccessKeyId'] = $mconfig['AccessKey'];
    $this->_fetch_arguments['Timestamp'] = gmdate( 'Y-m-d\\TH:i:s\\Z' );
    // secret access key for amazon API
    $this->_secret_access_key = $mconfig['SecretAccessKey'];
    // set parser conditions
    $this->_parser_doctype = '';
    $this->_parser_public_id = '';
  }

  /**
   * set the isbn
   *
   * @access public
   * @param string $isbn isbn10 or isbn13
   * @return bool TRUE if success
   */
  function set_isbn( $isbn ) {
    $tmp = preg_replace( '/[\\- ]/', '', $isbn );
    if ( strlen( $tmp ) == 10 ) {
      $tmp = $this->_isbn10_to_isbn13( $tmp );
    }
    if ( strlen( $tmp ) != 13 ) {
      return false;
    }
    $char = substr( $tmp, 3, 1 );
    switch ( $char ) {
    case '0':
    case '1':
      // us
      $this->_fetch_url = 'http://webservices.amazon.com/onca/xml';
      break;
    case '2':
      // france
      $this->_fetch_url = 'http://webservices.amazon.fr/onca/xml';
      break;
    case '3':
      // german
      $this->_fetch_url = 'http://webservices.amazon.de/onca/xml';
      break;
    case '4':
      // japan
      $this->_fetch_url = 'http://webservices.amazon.co.jp/onca/xml';
      break;
    default:
      // us
      $this->_fetch_url = 'http://webservices.amazon.com/onca/xml';
      break;
    }
    $this->_fetch_arguments['ItemId'] = $tmp;
    $this->_isbn = $isbn;
    return TRUE;
  }

  /**
   * override fetch()
   *
   */
  function fetch() {
    if ( empty( $this->_isbn ) ) {
      $this->_error_message = 'ISBN does not set';
      return false;
    }
    return parent::fetch();
  }

  /**
   * encode url for Amazon API
   *
   * @access protected
   * @param string $str encoding string
   * @return string encoded string
   */
  function encode_url( $str ) {
    // RFC 3986
    return str_replace( '%7E', '~', rawurlencode( $str ) );
  }

  /**
   * create url string for Amazon API
   *
   * @access protected
   * @param string $url fetch url
   * @param array $params url encoded parameters
   * @return string created url string
   */
  function create_url( $url, $arguments ) {
    // load 'hash_hmac()' compatibility function for PHP 4
    if ( ! function_exists( 'hash_hmac' ) ) {
      require_once( dirname( dirname( __FILE__ ) ).'/include/compat/hash_hmac.php' );
    }
    // create sigunature
    sort( $arguments );
    $sign_param = implode( '&', $arguments );
    $parsed_url = parse_url( $url );
    $string_to_sign = "GET\n{$parsed_url['host']}\n{$parsed_url['path']}\n{$sign_param}";
    $signature = base64_encode( hash_hmac( 'sha256', $string_to_sign, $this->_secret_access_key, true ) );

    // create request url
    $arguments[] = $this->encode_url( 'Signature' ).'='.$this->encode_url( $signature );
    sort( $arguments );
    return $url.'?'.implode( '&', $arguments );
  }

  /**
   * override function of start element handler
   *
   * @access private
   * @param resource $parser parser resource
   * @param string $tag xml tag
   */
  function parser_start_element( $attribs ) {
    switch ( $this->_parser_condition ) {
    case '/ItemLookupResponse/Items/Item':
      $this->_condition['item'] = array(
        'ASIN' => '',
        'ISBN' => '',
        'EAN' => '',
        'DetailPageURL' => '',
        'Title' => '',
        'Author' => array(),
        'PublicationDate' => '',
        'Publisher' => '',
      );
      break;
    case '/ItemLookupResponse/Items/Item/ItemAttributes/Author':
      $this->_condition['author'] = '';
      break;
    }
  }

  /**
   * override function of end element handler
   *
   * @access private
   * @param resource $parser parser resource
   * @param string $tag xml tag
   */
  function parser_end_element() {
    switch ( $this->_parser_condition ) {
    case '/ItemLookupResponse/Items/Item':
      $this->_data[$this->_isbn] = $this->_condition['item'];
      break;
    case '/ItemLookupResponse/Items/Item/ItemAttributes/Author':
      $this->_condition['item']['Author'][] = $this->_condition['author'];
      break;
    }
  }

  /**
   * override function of character data handler
   *
   * @access private
   * @param resource $parser parser resource
   * @param string $cdata character data
   */
  function parser_character_data( $cdata ) {
    switch ( $this->_parser_condition ) {
    case '/ItemLookupResponse/Items/Item/ASIN':
      // ASIN
      $this->_condition['item']['ASIN'] .= $cdata;
      break;
    case '/ItemLookupResponse/Items/Item/DetailPageURL':
      // DetailPageURL
      $this->_condition['item']['DetailPageURL'] .= $cdata;
      break;
    case '/ItemLookupResponse/Items/Item/ItemAttributes/Author':
      // Author
      $this->_condition['author'] .= $cdata;
      break;
    case '/ItemLookupResponse/Items/Item/ItemAttributes/EAN':
      // EAN
      $this->_condition['item']['EAN'] .= $cdata;
      break;
    case '/ItemLookupResponse/Items/Item/ItemAttributes/ISBN':
      // ISBN
      $this->_condition['item']['ISBN'] .= $cdata;
      break;
    case '/ItemLookupResponse/Items/Item/ItemAttributes/PublicationDate':
      // PublicationDate
      $this->_condition['item']['PublicationDate'] .= $cdata;
      break;
    case '/ItemLookupResponse/Items/Item/ItemAttributes/Publisher':
      // Publisher
      $this->_condition['item']['Publisher'] .= $cdata;
      break;
    case '/ItemLookupResponse/Items/Item/ItemAttributes/Title':
      // Title
      $this->_condition['item']['Title'] .= $cdata;
      break;
    }
  }

  /**
   * convert isbn10 to isbn13
   *
   * @access private
   * @param string $isbn10
   * @return string isbn13
   */
  function _isbn10_to_isbn13( $isbn10 ) {
    $check = 0;
    $tmp = substr( $isbn10, 0, 9 );
    $ar = str_split( '978'.$tmp, 1 );
    for ( $i = 0; $i < 12; $i++ ) {
      $check += $ar[$i] * ( $i % 2 == 0 ? 1 : 3 );
    }
    $check = ( 10 - ( $check % 10 ) ) % 10;
    $isbn13 = '978'.$tmp.$check;
    return $isbn13;
  }
}

// http://webservices.amazon.co.jp/onca/xml?Service=AWSECommerceService&AWSAccessKeyId=18SQ7EGXWJARBA4JX382&Version=2007-07-16&Operation=ItemLookup&IdType=ISBNResponseGroup=Medium&SearchIndex=Books&ItemId=9784915512636
// $us_isbn10 = '0553212788';
// $us_isbn13 = '9780553212785';
// $fr_isbn10 = '2100511076';
// $fr_isbn13 = '9782100511075';
// $de_isbn10 = '3827417236';
// $de_isbn13 = '9783827417237';
// $ja_isbn10 = '4915512630';
// $ja_isbn13 = '9784915512636';
// $ja_isbn10_2 = '4847040880';
// $ja_isbn13_2 = '9784847040887';
// $isbn = $ja_isbn13_2;
// $amazon = new XooNIps_Amazon_ECS40();
// if ( ! $amazon->set_isbn( $isbn ) ) {
//  die( $amazon->get_error_message() );
// }
// if ( ! $amazon->fetch() ) {
//  die( $amazon->get_error_message() );
// }
// if ( ! $amazon->parse() ) {
//  die( $amazon->get_error_message() );
// }
// $data =& $amazon->_data;
// var_dump( $data );
?>
