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<?php
class paypal_class {

   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

   function paypal_class() {

      // initialization constructor.  Called when class is created.

      $this->paypal_url = 'https://www.paypal.com/cgi-bin/webscr';

      $this->last_error = '';

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

      // populate $fields array with a few default values.  See the paypal
      // documentation for a list of fields and their data types. These defaul
      // values can be overwritten by the calling script.

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

   }

   function add_field($field, $value) {

      // adds a key=>value pair to the fields array, which is what will be
      // sent to paypal as POST variables.  If the value is already in the
      // array, it will be overwritten.

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

   function submit_paypal_post() {

      // this function actually generates an entire HTML page consisting of
      // a form with hidden elements which is submitted to paypal via the
      // BODY element's onLoad attribute.  We do this so that you can validate
      // any POST vars from you custom form before submitting to paypal.  So
      // basically, you'll have your own form which is submitted to your script
      // to validate the data, which in turn calls this function to create
      // another hidden form and submit to paypal.

      // The user will briefly see a message on the screen that reads:
      // "Please wait, your order is being processed..." and then immediately
      // is redirected to paypal.
      //echo '<pre>';print_r($this->fields);die();

      echo "<html>\n";
      echo "<head><title>Processing Payment...</title></head>\n";
      echo "<body onLoad=\"document.form.submit();\">\n";
      echo "<center class=\"paypalheading\"><h3>Please wait, your order is being processed...</h3><br /><img src='' width='50px'/><br />Loading......
      </center>\n";
      echo "<form method=\"post\" name=\"form\" action=\"".$this->paypal_url."\">\n";

      foreach ($this->fields as $name => $value) {
         echo "<input type=\"hidden\" name=\"$name\" value=\"$value\">";
      }

      echo "</form>\n";
      echo "</body></html>\n";
      echo die();

   }

   function validate_ipn() {

      // parse the paypal URL
      $url_parsed=parse_url($this->paypal_url);

      // generate the post string from the _POST vars aswell as load the
      // _POST vars into an arry so we can play with them from the calling
      // script.
      $post_string = '';
      foreach ($_POST as $field=>$value) {
         $this->ipn_data["$field"] = $value;
         $post_string .= $field.'='.urlencode($value).'&';
      }
      $post_string.="cmd=_notify-validate"; // append ipn command

      // open the connection to paypal
      $fp = fsockopen($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->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->log_ipn_results(false);
         return false;

      }

   }

   function log_ipn_results($success) {

      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");

      fclose($fp);  // close file
   }

   function dump_fields() {

      // Used for debugging, this function will output all the field/value pairs
      // that are currently defined in the instance of the class using the
      // add_field() function.

      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>";
   }
}
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