<?php

/**
* @version 2.7.26
* @package Joomla 1.5
* @subpackage DT Register
* @copyright Copyright (C) 2006 DTH Development
* @copyright contact dthdev@dthdevelopment.com
* @license http://www.gnu.org/copyleft/gpl.html GNU/GPL
*/

/*******************************************************************************

 *                      PHP Paypal IPN Integration Class
 *  DESCRIPTION:
 *
 *      This file provides a neat and simple method to interface with paypal and
 *      The paypal Instant Payment Notification (IPN) interface.  This file is
 *      NOT intended to make the paypal integration "plug 'n' play". It still
 *      requires the developer (that should be you) to understand the paypal
 *      process and know the variables you want/need to pass to paypal to
 *      achieve what you want.
 *
 *      This class handles the submission of an order to paypal aswell as the
 *      processing an Instant Payment Notification.
 *
 *      This code is based on that of the php-toolkit from paypal.  I've taken
 *      the basic principals and put it in to a class so that it is a little
 *      easier--at least for me--to use.  The php-toolkit can be downloaded from
 *      http://sourceforge.net/projects/paypal.
 *
 *      To submit an order to paypal, have your order form POST to a file with:
 *
 *          $p = new paypal_class;
 *          $p->add_field('business', 'somebody@domain.com');
 *          $p->add_field('first_name', $_POST['first_name']);
 *          ... (add all your fields in the same manor)
 *          $p->submit_paypal_post();
 *
 *      To process an IPN, have your IPN processing file contain:
 *
 *          $p = new paypal_class;
 *          if ($p->validate_ipn()) {
 *          ... (IPN is verified.  Details are in the ipn_data() array)
 *          }
 *
 *
 *      In case you are new to paypal, here is some information to help you:
 *
 *      1. Download and read the Merchant User Manual and Integration Guide from
 *         http://www.paypal.com/en_US/pdf/integration_guide.pdf.  This gives
 *         you all the information you need including the fields you can pass to
 *         paypal (using add_field() with this class) aswell as all the fields
 *         that are returned in an IPN post (stored in the ipn_data() array in
 *         this class).  It also diagrams the entire transaction process.
 *
 *      2. Create a "sandbox" account for a buyer and a seller.  This is just
 *         a test account(s) that allow you to test your site from both the
 *         seller and buyer perspective.  The instructions for this is available
 *         at https://developer.paypal.com/ as well as a great forum where you
 *         can ask all your paypal integration questions.  Make sure you follow
 *         all the directions in setting up a sandbox test environment, including
 *         the addition of fake bank accounts and credit cards.
 *
 *******************************************************************************
*/

defined( '_JEXEC' ) or die( 'Direct Access to this location is not allowed.' );

require_once( JPATH_SITE.'/components/com_dtregister/lib/class.payment.php');

class paypal extends Payment{

   var $last_error;                 // holds the last error encountered

   var $ipn_log;                    // bool: log IPN results to text file?

   var $ipn_log_file;               // filename of the IPN log

   var $ipn_response;               // holds the IPN response from paypal

   var $ipn_data = array();         // array contains the POST values for IPN

   var $fields = array();           // array holds the fields to submit to paypal

   var $bywebservice = false;

   function __construct() {

      // initialization constructor.  Called when class is created.

      parent::__construct();
      
      $this->paypal_url = ($this->paymentmode=='test')?'https://www.sandbox.paypal.com/cgi-bin/webscr':'https://www.paypal.com/cgi-bin/webscr';

      $this->last_error = '';

      $this->ipn_log_file = 'ipn_log.txt';

      $this->ipn_log_file = dirname(__FILE__)."/ipnlog.txt";
	  //pr($this->ipn_log_file);

      $this->ipn_log = true;

      $this->ipn_response = '';  

      $this->add_field('rm','2');           // Return method = POST

	  // $this->add_field('item_name',$this->confirmNum);

      $this->add_field('cmd','_xclick');

	 // $this->add_field('button_subtype','services');

	  $this->add_field('no_shipping','1');

	  //$this->add_field('bn','PP-BuyNowBF:btn_buynowCC_LG.gif:NonHosted');
      $this->add_field('charset', "utf-8");
	  $this->add_field('bn','DTHDev_SP');

   }

   function add_field($field, $value) {

      $this->fields["$field"] = $value;

   }

   function process(){

	   global $currency_code,$paypalid,$Itemid;

	   $mosConfig_live_site = JURI::root( false );

	   if($currency_code==""){$currency_code='USD';}

	   $this->paypal_url = ($this->paymentmode=='test')?'https://www.sandbox.paypal.com/cgi-bin/webscr':'https://www.paypal.com/cgi-bin/webscr'; 

	   $session_id = $this->saveSession();

	   $this->add_field('business', "$paypalid");

	   $this->add_field('return', "{$mosConfig_live_site}components/com_dtregister/success.php?return=$session_id&Itemid=$Itemid&task=restore");

	   $this->add_field('cancel_return', "{$mosConfig_live_site}components/com_dtregister/success.php?return=$session_id&Itemid=$Itemid&task=cancel");

	   $this->add_field('notify_url', "{$mosConfig_live_site}components/com_dtregister/success.php?return=$session_id&Itemid=$Itemid&task=notification");
	   
	   $this->add_field('item_name',$this->description);
	   
	   if($this->paymentmode=='test'){

		   $this->add_field('test_ipn', 1);

	    }
		
	  if(isset($this->firstname) && $this->firstname !="" ){
	  	 $this->add_field('first_name', $this->firstname);
	  }
	  
	   if(isset($this->lastname) && $this->lastname !="" ){
	  	 $this->add_field('last_name', $this->lastname);
	  }
	  
	   if(isset($this->address) && $this->address !="" ){
	  	 $this->add_field('address1', $this->address);
	  }
	  
	   if(isset($this->city) && $this->city !="" ){
	  	 $this->add_field('city', $this->city);
	  }
	  if(isset($this->state) && $this->state !="" ){
	  	 $this->add_field('state', $this->state);
	  }
	  
	   if(isset($this->zip) && $this->zip !="" ){
	  	 $this->add_field('zip', $this->zip);
	  }
	  
	   if(isset($this->email) && $this->email !="" ){
	  	 $this->add_field('email', $this->email);
	  }
		
	   $this->add_field('amount', $this->cart->getAmount());

	   $this->add_field('currency_code', "$currency_code");

	   //$this->add_field('custom', "test|session=$session_id");
	   
	   $this->add_field('custom', "");

	   $this->submit_paypal_post();

   }

   function submit_paypal_post() {

      echo "<center><h3>".JText::_( 'DT_PAYPAL_REDIRECT_MSG')."</h3></center>\n";

      echo "<form method=\"post\" name=\"formRegister\" action=\"".$this->paypal_url."\">\n";

      foreach ($this->fields as $name => $value) {

         echo "<input type=\"hidden\" name=\"$name\" value=\"$value\">";

      }

?>

		<script language="javascript">

			function rg_direc_to_paypal(){

				document.formRegister.submit();

			}

			setTimeout("rg_direc_to_paypal()",5000);

		</script>

<?php

      echo "</form>\n";

   }

   function validate_ipn() {

      // parse the paypal URL

      $url_parsed=parse_url($this->paypal_url);

      $post_string = '';

      foreach ($_POST as $field=>$value) {
         if($field == "controller") {
		 	continue;
		 }
         $this->ipn_data["$field"] = $value;

         $post_string .= $field.'='.urlencode($value).'&';

      }

      $post_string.="cmd=_notify-validate"; // append ipn command

      $fp = fsockopen($url_parsed[host],"80",$err_num,$err_str,30);

      if(!$fp) {

         // could not open the connection.  If loggin is on, the error message

         // will be in the log.

         $this->last_error = "fsockopen error no. $errnum: $errstr".$this->paypal_url. $post_string;

         $this->log_ipn_results(false);

         return false;

      } else {

         // Post the data back to paypal

         fputs($fp, "POST $url_parsed[path] HTTP/1.1\r\n");

         fputs($fp, "Host: $url_parsed[host]\r\n");

         fputs($fp, "Content-type: application/x-www-form-urlencoded\r\n");

         fputs($fp, "Content-length: ".strlen($post_string)."\r\n");

         fputs($fp, "Connection: close\r\n\r\n");

         fputs($fp, $post_string . "\r\n\r\n");

         // loop through the response from the server and append to variable

         while(!feof($fp)) {

            $this->ipn_response .= fgets($fp, 1024);

         }

         fclose($fp); // close connection

      }

     if (eregi("VERIFIED",$this->ipn_response)) {

         // Valid IPN transaction.

         $this->log_ipn_results(true);

       return true;

      } else {

         // Invalid IPN transaction.  Check the log for details.

         $this->last_error = 'IPN Validation Failed.'.$this->paypal_url." ". $post_string;

         $this->log_ipn_results(false);

         return true;

      }

   }

   function log_ipn_results($success) {
       return;
    //  if (!$this->ipn_log) return;  // is logging turned off?

      // Timestamp

      $text = '['.date('m/d/Y g:i A').'] - ';

      // Success or failure being logged?

      if ($success) $text .= "SUCCESS!\n";

      else $text .= 'FAIL: '.$this->last_error."\n";

      // Log the POST variables

      $text .= "IPN POST Vars from Paypal:\n";

      foreach ($this->ipn_data as $key=>$value) {

         $text .= "$key=$value, ";

      }

      // Log the response from the paypal server

      $text .= "\nIPN Response from Paypal Server:\n ".$this->ipn_response;

      // Write to log

      $fp=fopen($this->ipn_log_file,'a');

      fwrite($fp, $text . "\n\n");
	  
	   fwrite($fp, var_export($_SESSION,true). "\n\n");

      fclose($fp);  // close file

   }

   function dump_fields() {

      echo "<h3>paypal_class->dump_fields() Output:</h3>";

      echo "<table width=\"95%\" border=\"1\" cellpadding=\"2\" cellspacing=\"0\">

            <tr>

               <td bgcolor=\"black\"><b><font color=\"white\">Field Name</font></b></td>

               <td bgcolor=\"black\"><b><font color=\"white\">Value</font></b></td>

            </tr>";

      ksort($this->fields);

      foreach ($this->fields as $key => $value) {

         echo "<tr><td>$key</td><td>".urldecode($value)."&nbsp;</td></tr>";

      }

      echo "</table><br>";

   }
   
   function notify(){
	   
	 //  pr($_SESSION);
	   if($this->validate_ipn() && ($_REQUEST['payment_status']=='Completed' || $_REQUEST['payment_status']=='Pending' || $_REQUEST['payment_status']=='Processed')){
		   $this->transactionId = $_REQUEST['txn_id'];
		   $process = DT_Session::get('Setting.process') ;
		   DT_Session::set($process.'.payment.transactionId', $this->transactionId);
		   return true;
	   }else{
		   pr($this->validate_ipn());
		   return false;
	   }
	      
   }

}