Change Amazon URLs to affiliate links

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?php

function affiliate_filter($op, $delta = 0, $format = -1, $text = '') {
  switch ($op) {
    case 'list':
      return array(0 => t('Affiliate filter'));
    case 'description':
      return t('Create affiliates links from Amazon links.');
    case 'process':
      if (preg_match('|http://www.amazon.com/.*/([0-9A-Z]{10})/\S*|', $text, $m)) {
        $item_id = $m[1];
        $affiliate_id = variable_get('affiliate_id', '');
        $access_key = variable_get('access_key', '');
        $xml = simplexml_load_file("http://ecs.amazonaws.com/onca/xml?Service=AWSECommerceService&AWSAccessKeyId=$access_key&Operation=ItemLookup&ItemId=$item_id");
        $url = "http://www.amazon.com/dp/$item_id/?tag=$affiliate_id";
        $link = l($xml->Items->Item->ItemAttributes->Title, $url);
        $text = str_replace($m[0], $link, $text);
      }
      return $text;
    default:
      return $text;
  }
}

function affiliate_filter_tips() {
  return t('Changes Amazon URLs to affiliate links');
}
?>

Talked to EATON, will be included into the D6 project...