<?php

/*
 * Copyright (C) 2007 Google Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * 
 */

 /** This class is instantiated everytime any notification or 
  * order processing commands are received.
  * 
  * @version $Id: googlerequest.php 7541 2011-07-07 08:51:35Z gBrunier $
  * It has a SendReq function to post different requests to the Google Server
  * Send functions are provided for most of the commands that are supported
  * by the server for this code
  */
  define('PHP_SAMPLE_CODE_VERSION', 'v1.2.5');
  define('ENTER', "\r\n");
  define('DOUBLE_ENTER', ENTER.ENTER);  
  // Max size of the Google Messsage string
  define('GOOGLE_MESSAGE_LENGTH', 254);
  define('GOOGLE_REASON_LENGTH', 140);
  
  /**
   * Send requests to the Google Checkout server to perform different actions
   */
  // refer demo/responsehandlerdemo.php for different use case scenarios 
  class GoogleRequest {
    var $merchant_id;
    var $merchant_key;
    var $currency;
    var $server_url;
    var $schema_url;
    var $base_url;
    var $checkout_url;
    var $checkout_diagnose_url;
    var $request_url;
    var $request_diagnose_url;
    var $merchant_checkout;
		var $proxy = array();
    
    var $certPath='';
    var $log;

    /**
		 * @param string $id the merchant id
		 * @param string $key the merchant key
		 * @param string $server_type the server type of the server to be used, one 
		 *                            of 'sandbox' or 'production'.
		 *                            defaults to 'sandbox'
		 * @param string $currency the currency of the items to be added to the cart
     *                         , as of now values can be 'USD' or 'GBP'.
     *                         defaults to 'USD'
     */
    function GoogleRequest($id, $key, $server_type="sandbox", $currency="USD") {
      $this->merchant_id = $id;
      $this->merchant_key = $key;
      $this->currency = $currency;

      if (strtolower($server_type) == "sandbox") {
        $this->server_url = "https://sandbox.google.com/checkout/";
      } else {
        $this->server_url = "https://checkout.google.com/";
      }  


      $this->schema_url = "http://checkout.google.com/schema/2";
      $this->base_url = $this->server_url . "api/checkout/v2/"; 
      $this->request_url = $this->base_url . "request/Merchant/" . $this->merchant_id;
      $this->merchant_checkout = $this->base_url . "merchantCheckout/Merchant/" . $this->merchant_id;

      ini_set('include_path', ini_get('include_path').PATH_SEPARATOR.'.');
      require_once('googlelog.php');
      $this->log = new GoogleLog('', '', L_OFF);
      
    }

    function SetLogFiles($errorLogFile, $messageLogFile, $logLevel=L_ERR_RQST) {
      $this->log = new GoogleLog($errorLogFile, $messageLogFile, $logLevel);
    }
    /**
     * Submit a SetCertificatePath request.
     * 
     * GC Accepted SSL Certs:
     * {@link http://googlecheckoutapi.blogspot.com/2007/07/accepting-50-additional-ssl-root-cas.html}
     * 
     * @param string $certPath The name of a file holding one or more certificates
     *  to verify the peer with
     */

    function SetCertificatePath($certPath) {
      $this->certPath = $certPath;
    }

    /**
     * Submit a server-to-server request.
     * 
     * more info:
     * {@link http://code.google.com/apis/checkout/developer/index.html#alternate_technique}
     * 
     * @param string $xml_cart the cart's xml
     * @param bool $die whether to die() or not after performing the request,
     *                  defaults to true
     * 
     * @return array with the returned http status code (200 if OK) in index 0 
     *               and the redirect url returned by the server in index 1
		 */
    public function SendServer2ServerCart($xml_cart, $die=true) {
      list($status, $body) = $this->SendReq($this->merchant_checkout, 
                   $this->GetAuthenticationHeaders(), $xml_cart);
      if ($status != 200 ){
          return array($status, $body);
      } else {
        ini_set('include_path', ini_get('include_path').PATH_SEPARATOR.'.');
        require_once('xml-processing/gc_xmlparser.php');
  
        $xml_parser = new gc_xmlparser($body);
        $root = $xml_parser->GetRoot();
				$data = $xml_parser->GetData();
        
        $this->log->logRequest("Redirecting to: ". 
                        $data[$root]['redirect-url']['VALUE']);
        header('Location: ' . $data[$root]['redirect-url']['VALUE']);
        if ($die) {
          die($data[$root]['redirect-url']['VALUE']);
        }
        else {
          return array(200, $data[$root]['redirect-url']['VALUE']);
        }
      }
		}

    /**
     * Send a <charge-order> command to the Google Checkout server
     * 
     * info: {@link http://code.google.com/apis/checkout/developer/index.html#charge_order_example}
     * 
     * @param string $google_order the google id of the order
     * @param double $amount the amount to be charged, if empty the whole 
     *                       amount of the order will be charged
     * 
     * @return array the status code and body of the response
     */
    function SendChargeOrder($google_order, $amount='') {
      $postargs = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
                  <charge-order xmlns=\"".$this->schema_url.
                  "\" google-order-number=\"". $google_order. "\">";
      if ($amount != '') {
        $postargs .= "<amount currency=\"" . $this->currency . "\">" .
                      $amount . "</amount>";
      }
      $postargs .= "</charge-order>";
      return $this->SendReq($this->request_url, 
                   $this->GetAuthenticationHeaders(), $postargs); 
    }

    /**
     * Send a <refund-order> command to the Google Checkout server
     * 
     * info: {@link http://code.google.com/apis/checkout/developer/index.html#refund_order_example}
     * 
     * @param string $google_order the google id of the order
     * @param double $amount the amount to be refunded, if empty the whole 
     *                       amount of the order will be refunded 
     * @param string $reason the reason why the refund is taking place
     * @param string $comment a comment about the refund
     * 
     * @return array the status code and body of the response
     */
    function SendRefundOrder($google_order, $amount, $reason, 
                              $comment='') {
      $postargs = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
                  <refund-order xmlns=\"".$this->schema_url.
                  "\" google-order-number=\"". $google_order. "\">" .
                  "<reason>". $reason . "</reason>";
      if ($amount!=0) {
        $postargs .= "<amount currency=\"" . $this->currency . "\">".
                      htmlentities($amount)."</amount>";
      }
      $postargs .= "<comment>". htmlentities($comment) . "</comment>
                  </refund-order>";
      return $this->SendReq($this->request_url, 
                   $this->GetAuthenticationHeaders(), $postargs); 
    }

    /**
     * Send a <cancel-order> command to the Google Checkout server
     * 
     * info: {@link http://code.google.com/apis/checkout/developer/index.html#refund_order_example}
     * 
     * @param string $google_order the google id of the order
     * @param string $reason the reason why the order is being cancelled
     * @param string $comment a comment about the cancellation
     * 
     * @return array the status code and body of the response
     */
    function SendCancelOrder($google_order, $reason, $comment) {
      $postargs = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
                  <cancel-order xmlns=\"".$this->schema_url.
                  "\" google-order-number=\"". $google_order. "\">
                  <reason>".
                    (substr(htmlentities(strip_tags($reason)),0,GOOGLE_REASON_LENGTH)) .
                  "</reason>
                  <comment>".
                    (substr(htmlentities(strip_tags($comment)),0,GOOGLE_REASON_LENGTH)) .                   
                  "</comment>
                  </cancel-order>";
      return $this->SendReq($this->request_url, 
                   $this->GetAuthenticationHeaders(), $postargs); 
    }

    /**
     * Send an <add-tracking-data> command to the Google Checkout server, which
     * will associate a shipper's tracking number with an order.
     * 
     * info: {@link http://code.google.com/apis/checkout/developer/index.html#add_tracking_data_example}
     * 
     * @param string $google_order the google id of the order
     * @param string $carrier the carrier, valid values are "DHL", "FedEx", 
     *                        "UPS", "USPS" and "Other"
     * @param string $tracking_no the shipper's tracking number 
     * 
     * @return array the status code and body of the response
     */
    function SendTrackingData($google_order, $carrier, 
                                              $tracking_no) {
      $postargs = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
                  <add-tracking-data xmlns=\"". $this->schema_url . 
                  "\" google-order-number=\"". $google_order . "\">
                  <tracking-data>
                  <carrier>". htmlentities($carrier) . "</carrier>
                  <tracking-number>". $tracking_no . "</tracking-number>
                  </tracking-data>
                  </add-tracking-data>";
      return $this->SendReq($this->request_url, 
                   $this->GetAuthenticationHeaders(), $postargs); 
    }

    /**
     * Send an <add-merchant-order-number> command to the Google Checkout
     * server, which will associate a merchant order number with an order
     * 
     * info: {@link http://code.google.com/apis/checkout/developer/index.html#add_merchant_order_number_example}
     * 
     * @param string $google_order the google id of the order
     * @param string $merchant_order the merchant id of the order
     * 
     * @return array the status code and body of the response
     */
    function SendMerchantOrderNumber($google_order, 
                                              $merchant_order, $timeout=false) {
      $postargs = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
                  <add-merchant-order-number xmlns=\"". $this->schema_url . 
                  "\" google-order-number=\"". $google_order . "\">
                  <merchant-order-number>" . $merchant_order . 
                  "</merchant-order-number>
                  </add-merchant-order-number>";     
      return $this->SendReq($this->request_url, 
                   $this->GetAuthenticationHeaders(), $postargs, $timeout); 
    }

    /**
     * Send a <send-buyer-message> command to the Google Checkout
     * server, which will place a message in the customer's Google Checkout
     * account
     * 
     * info: {@link http://code.google.com/apis/checkout/developer/index.html#send_buyer_message_example}
     * 
     * @param string $google_order the google id of the order
     * @param string $message the message to be sent to the customer
     * @param string $send_email whether Google should send an email to
     *                           the buyer, use "true" or"false",
     *                           defaults to "true"
     * 
     * @return array the status code and body of the response
     */
    function SendBuyerMessage($google_order, $message, 
                                      $send_mail="true", $timeout=false) {
      $postargs = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
                  <send-buyer-message xmlns=\"". $this->schema_url . 
                  "\" google-order-number=\"". $google_order . "\">
                  <message>" . 
            (substr(htmlentities(strip_tags($message)),0,GOOGLE_MESSAGE_LENGTH)) 
               . "</message>
                  <send-email>" . strtolower($send_mail) . "</send-email>
                  </send-buyer-message>";     
      return $this->SendReq($this->request_url, 
                   $this->GetAuthenticationHeaders(), $postargs, $timeout); 
    }

    /**
     * Send a <process-order> command to the Google Checkout
     * server, which will update an order's fulfillment state from NEW to
     * PROCESSING
     * 
     * info: {@link http://code.google.com/apis/checkout/developer/index.html#process_order_example}
     * 
     * @param string $google_order the google id of the order
     * 
     * @return array the status code and body of the response
     */
    function SendProcessOrder($google_order) {
      $postargs = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
                  <process-order xmlns=\"".$this->schema_url    .
                  "\" google-order-number=\"". $google_order. "\"/> ";
      return $this->SendReq($this->request_url, 
                   $this->GetAuthenticationHeaders(), $postargs); 
    }

    /**
     * Send a <deliver-order> command to the Google Checkout server, which
     * will update an order's fulfillment state from either NEW or PROCESSING
     * to DELIVERED
     * 
     * info: {@link http://code.google.com/apis/checkout/developer/index.html#deliver_order_example}
     * 
     * @param string $google_order the google id of the order
     * @param string $carrier the carrier, valid values are "DHL", "FedEx", 
     *                        "UPS", "USPS" and "Other"
     * @param string $tracking_no the shipper's tracking number 
     * @param string $send_email whether Google should send an email to
     *                           the buyer, use "true" or"false",
     *                           defaults to "true"
     * 
     * @return array the status code and body of the response
     */
    function SendDeliverOrder($google_order, $carrier="",
                              $tracking_no="", $send_mail = "true") {
      $postargs = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
                  <deliver-order xmlns=\"". $this->schema_url . 
                  "\" google-order-number=\"". $google_order . "\">";
      if ($carrier != "" && $tracking_no != "") {
         $postargs .= "<tracking-data>
                  <carrier>". htmlentities($carrier) . "</carrier>
            <tracking-number>". htmlentities($tracking_no) . "</tracking-number>
                  </tracking-data>";
      }
      $postargs .= "<send-email>". strtolower($send_mail) . "</send-email>
                  </deliver-order>";  
      return $this->SendReq($this->request_url, 
                   $this->GetAuthenticationHeaders(), $postargs); 
    }
    
    /**
     * Send a <archive-order> command to the Google Checkout
     * server, which removes an order from the merchant's Merchant Center Inbox
     * 
     * info: {@link http://code.google.com/apis/checkout/developer/index.html#archive_order_example}
     * 
     * @param string $google_order the google id of the order
     * 
     * @return array the status code and body of the response
     */
    function SendArchiveOrder($google_order) {
      $postargs = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
                  <archive-order xmlns=\"".$this->schema_url.
                  "\" google-order-number=\"". $google_order. "\"/>";
      return $this->SendReq($this->request_url, 
                   $this->GetAuthenticationHeaders(), $postargs); 
    }

    /**
     * Send a <archive-order> command to the Google Checkout
     * server, which returns a previously archived order to the merchant's
     * Merchant Center Inbox
     * 
     * info: {@link http://code.google.com/apis/checkout/developer/index.html#unarchive_order_example}
     * 
     * @param string $google_order the google id of the order
     * 
     * @return array the status code and body of the response
     */
    function SendUnarchiveOrder($google_order) {
      $postargs = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
                  <unarchive-order xmlns=\"".
                  $this->schema_url."\" google-order-number=\"". 
                  $google_order. "\"/>";
      return $this->SendReq($this->request_url, 
                   $this->GetAuthenticationHeaders(), $postargs); 
    }

/**
 * Ship items API Commands
 * info: {@link http://code.google.com/apis/checkout/developer/Google_Checkout_XML_API_Line_Item_Shipping.html}
 * 
 * 
 */
 
    /**
     * Send a <ship-items> command to the Google Checkout
     * server, 
     * 
     * info: {@link http://code.google.com/apis/checkout/developer/Google_Checkout_XML_API_Line_Item_Shipping.html#tag_ship-items}
     * 
     * @param string $google_order the google id of the order
     * @param array $items_list a list of GoogleShipItem classes.
     * @param string $send_email whether Google should send an email to
     *                           the buyer, use "true" or"false",
     *                           defaults to "true"
     * 
     * @return array the status code and body of the response
     */

    function SendShipItems($google_order, $items_list=array(), $send_mail="true") {
      $postargs = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
                  <ship-items xmlns=\"". $this->schema_url . 
                  "\" google-order-number=\"". $google_order . "\">" .
                  "<item-shipping-information-list>\n";
      foreach($items_list as $item) {
        $postargs .= "<item-shipping-information>
                      <item-id>
                        <merchant-item-id>" . $item->merchant_item_id . "</merchant-item-id>
                     </item-id>\n";

        if (count($item->tracking_data_list)) {
          $postargs .= "<tracking-data-list>\n";
          foreach($item->tracking_data_list as $tracking_data) {
            $postargs .= "<tracking-data>
                            <carrier>". htmlentities($tracking_data['carrier']) . "</carrier>
                            <tracking-number>". $tracking_data['tracking-number'] . "</tracking-number>
                          </tracking-data>\n";
          }
          $postargs .= "</tracking-data-list>\n";
        }
        $postargs .= "</item-shipping-information>\n";
      }
      $postargs .= "</item-shipping-information-list>\n" .
                  "<send-email>". strtolower($send_mail) . "</send-email>
                  </ship-items>";
      return $this->SendReq($this->request_url, 
                   $this->GetAuthenticationHeaders(), $postargs);       
      
    }

    /**
     * Send a <backorder-items> command to the Google Checkout
     * 
     * info: {@link http://code.google.com/apis/checkout/developer/Google_Checkout_XML_API_Line_Item_Shipping.html#tag_backorder-items}
     * 
     * @param string $google_order the google id of the order
     * @param array $items_list a list of GoogleShipItem classes.
     * @param string $send_email whether Google should send an email to
     *                           the buyer, use "true" or"false",
     *                           defaults to "true"
     * 
     * @return array the status code and body of the response
     */
    function SendBackorderItems($google_order, $items_list=array(), $send_mail="true") {
      $postargs = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
                  <backorder-items xmlns=\"".
                  $this->schema_url."\" google-order-number=\"". 
                  $google_order. "\">";
      $postargs .= "<item-ids>";
      foreach($items_list as $item) {
        $postargs .= "<item-id>
                        <merchant-item-id>" . $item->merchant_item_id . "</merchant-item-id>
                      </item-id>";
      }
      $postargs .= "</item-ids>";
      $postargs .= "<send-email>". strtolower($send_mail) . "</send-email>
                    </backorder-items>";
      return $this->SendReq($this->request_url, 
                   $this->GetAuthenticationHeaders(), $postargs); 
    }

    /**
     * Send a <cancel-items> command to the Google Checkout
     * 
     * info: {@link http://code.google.com/apis/checkout/developer/Google_Checkout_XML_API_Line_Item_Shipping.html#tag_cancel-items}
     * 
     * @param string $google_order the google id of the order
     * @param array $items_list a list of GoogleShipItem classes.
     * @param string $reason the reason why the refund is taking place
     * @param string $comment a comment about the refund
     * @param string $send_email whether Google should send an email to
     *                           the buyer, use "true" or"false",
     *                           defaults to "true"
     * 
     * @return array the status code and body of the response
     */
    function SendCancelItems($google_order, $items_list=array(), $reason, 
                                               $comment='', $send_mail="true") {
      $postargs = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
                  <cancel-items xmlns=\"".
                  $this->schema_url."\" google-order-number=\"". 
                  $google_order. "\">";
      $postargs .= "<item-ids>";
      foreach($items_list as $item) {
        $postargs .= "<item-id>
                        <merchant-item-id>" . $item->merchant_item_id . "</merchant-item-id>
                      </item-id>";
      }
      $postargs .= "</item-ids>";
      $postargs .= "<send-email>". strtolower($send_mail) . "</send-email>
                  <reason>".
                    (substr(htmlentities(strip_tags($reason)),0,GOOGLE_REASON_LENGTH)) .
                  "</reason>
                  <comment>".
                    (substr(htmlentities(strip_tags($comment)),0,GOOGLE_REASON_LENGTH)) .                   
                  "</comment>
                  </cancel-items>";
      return $this->SendReq($this->request_url, 
                   $this->GetAuthenticationHeaders(), $postargs); 
    }

    /**
     * Send a <return-items> command to the Google Checkout
     * 
     * info: {@link http://code.google.com/apis/checkout/developer/Google_Checkout_XML_API_Line_Item_Shipping.html#tag_return-items}
     * 
     * @param string $google_order the google id of the order
     * @param array $items_list a list of GoogleShipItem classes.
     * @param string $send_email whether Google should send an email to
     *                           the buyer, use "true" or"false",
     *                           defaults to "true"
     * 
     * @return array the status code and body of the response
     */
    function SendReturnItems($google_order, $items_list=array(), $send_mail="true") {
      $postargs = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
                  <return-items xmlns=\"".
                  $this->schema_url."\" google-order-number=\"". 
                  $google_order. "\">";
      $postargs .= "<item-ids>";
      foreach($items_list as $item) {
        $postargs .= "<item-id>
                        <merchant-item-id>" . $item->merchant_item_id . "</merchant-item-id>
                      </item-id>";
      }
      $postargs .= "</item-ids>";
      $postargs .= "<send-email>". strtolower($send_mail) . "</send-email>
                    </return-items>";
      return $this->SendReq($this->request_url, 
                   $this->GetAuthenticationHeaders(), $postargs); 
    }

    /**
     * Send a <reset-items-shipping-information> command to the Google Checkout
     * 
     * info: {@link http://code.google.com/apis/checkout/developer/Google_Checkout_XML_API_Line_Item_Shipping.html#tag_reset-items-shipping-information}
     * 
     * @param string $google_order the google id of the order
     * @param array $items_list a list of GoogleShipItem classes.
     * @param string $send_email whether Google should send an email to
     *                           the buyer, use "true" or"false",
     *                           defaults to "true"
     * 
     * @return array the status code and body of the response
     */
    function SendResetItemsShippingInformation($google_order, $items_list=array(), $send_mail="true") {
      $postargs = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
                  <reset-items-shipping-information xmlns=\"".
                  $this->schema_url."\" google-order-number=\"". 
                  $google_order. "\">";
      $postargs .= "<item-ids>";
      foreach($items_list as $item) {
        $postargs .= "<item-id>
                        <merchant-item-id>" . $item->merchant_item_id . "</merchant-item-id>
                      </item-id>";
      }
      $postargs .= "</item-ids>";
      $postargs .= "<send-email>". strtolower($send_mail) . "</send-email>
                    </reset-items-shipping-information>";
      return $this->SendReq($this->request_url, 
                   $this->GetAuthenticationHeaders(), $postargs); 
    }

    /**
     * @access private
     */
    function GetAuthenticationHeaders() {
      $headers = array();
      $headers[] = "Authorization: Basic ".base64_encode(
          $this->merchant_id.':'.$this->merchant_key);
      $headers[] = "Content-Type: application/xml; charset=UTF-8";
      $headers[] = "Accept: application/xml; charset=UTF-8";
      $headers[] = "User-Agent: GC-PHP-Sample_code (" . PHP_SAMPLE_CODE_VERSION . "/ropu)";
      return $headers; 
    }
    /**
     * Set the proxy to be used by the connections to the outside
     * 
     * @param array $proxy Array('host' => 'proxy-host', 'port' => 'proxy-port')
     * 
     */
    function SetProxy($proxy=array()) {
      if (is_array($proxy) && count($proxy)) {
        $this->proxy['host'] = $proxy['host'];
        $this->proxy['port'] = $proxy['port'];
      }
    }

    /**
     * @access private
     */
    function SendReq($url, $header_arr, $postargs, $timeout=false) {
      // Get the curl session object
      $session = curl_init($url);
      $this->log->LogRequest($postargs);
      // Set the POST options.
      curl_setopt($session, CURLOPT_POST, true);
      curl_setopt($session, CURLOPT_HTTPHEADER, $header_arr);
      curl_setopt($session, CURLOPT_POSTFIELDS, $postargs);
      curl_setopt($session, CURLOPT_HEADER, true);
      curl_setopt($session, CURLOPT_RETURNTRANSFER, true);

      if (!empty($this->certPath) && file_exists($this->certPath)) {
        curl_setopt($session, CURLOPT_SSL_VERIFYPEER, true);
        curl_setopt($session, CURLOPT_CAINFO, $this->certPath);
      }
      else {
        curl_setopt($session, CURLOPT_SSL_VERIFYPEER, false);
      }

      if (is_array($this->proxy) && count($this->proxy)) {
         curl_setopt($session, CURLOPT_PROXY, 
                            $this->proxy['host'] . ":" . $this->proxy['port']);
      }
      if ($timeout != false){
        curl_setopt($session, CURLOPT_TIMEOUT, $timeout);
        
      }
      // Do the POST and then close the session
      $response = curl_exec($session);
      if (curl_errno($session)) {
         $this->log->LogError(curl_error($session));
        return array("CURL_ERR", curl_error($session));
      } else {
        curl_close($session);
      }
      $heads = $this->parse_headers($response);
      $body = $this->get_body_x($response);
            
//      // Get HTTP Status code from the response
      $status_code = array();
      preg_match('/\d\d\d/', $heads[0], $status_code);
      
      // Check for errors
      switch( $status_code[0] ) {
        case 200:
          // Success
            $this->log->LogResponse($response);          
            return array(200, $body);
          break;
        case 503:
            $this->log->LogError($response);
            return array(503, htmlentities($body));
          break;
        case 403:
            $this->log->LogError($response);
            return array(403, htmlentities($body));
          break;
        case 400:
            $this->log->LogError($response);
            return array(400, htmlentities($body));
          break;
        default:
            $this->log->LogError($response);
            return array("ERR", htmlentities($body));
          break;
      }
    }

// Private functions
// Function to get HTTP headers,
// will also work with HTTP 200 status added by some proxy servers
    /**
     * @access private
     */
    function parse_headers($message) {
      $head_end = strpos($message, DOUBLE_ENTER);
      $headers = $this->get_headers_x(substr($message,0,
                                             $head_end + strlen(DOUBLE_ENTER)));
      if (!is_array($headers) || empty($headers)){
        return null;
      }
      if (!preg_match('%[HTTP/\d\.\d] (\d\d\d)%', $headers[0], $status_code)) {
        return null;
      }
      switch( $status_code[1] ) {
        case '200':
          $parsed = $this->parse_headers(substr($message,
                                             $head_end + strlen(DOUBLE_ENTER)));
          return is_null($parsed)?$headers:$parsed;
        break;
        default:
          return $headers;
        break;
      }
    }
    
    /**
     * @access private
     */
    function get_headers_x($heads, $format=0) {
      $fp = explode(ENTER, $heads);
      foreach($fp as $header){
        if ($header == "") {
          $eoheader = true;
          break;
        } else {
          $header = trim($header);
        }
    
        if ($format == 1) {
          $key = array_shift(explode(':',$header));
          if ($key == $header) {
            $headers[] = $header;
          } else {
            $headers[$key]=substr($header,strlen($key)+2);
          }
          unset($key);
        } else {
         $headers[] = $header;
        }
      }
      return $headers;
    }
    
    /**
     * @access private
     */
    function get_body_x($heads){
      $fp = explode(DOUBLE_ENTER, $heads, 2);
      return $fp[1];
    }
  }
  
class GoogleShipItem {
  var $merchant_item_id;
  var $tracking_data_list;
  var $tracking_no;
  
  function GoogleShipItem($merchant_item_id, $tracking_data_list=array()) {
    $this->merchant_item_id = $merchant_item_id;
    $this->tracking_data_list = $tracking_data_list;
  }
  
  function AddTrackingData($carrier, $tracking_no) {
    if ($carrier != "" && $tracking_no != "") {
      $this->tracking_data_list[] = array('carrier' => $carrier, 
                                          'tracking-number' => $tracking_no);
    }
  }
}