class.paypal_ipn.php

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<?php

// class that works with PayPal Instant Payment Notification. It takes what was
// sent from PayPal and sends an indentical response back to PayPal, then waits
// for verification from PayPal

class paypal_ipn {

	var $paypal_post_vars;
	var $paypal_response;

	var $timeout;

	// error logging info
	var $error_email;
	var $from_email;

	function paypal_ipn($paypal_post_vars, $error_email, $from_email, $timeout = 120) {

		$this->paypal_post_vars = $paypal_post_vars;
		$this->timeout = $timeout;
		$this->error_email=$error_email;
		$this->from_email=$from_email;
		$this->paypal_response = "";
	}

	function request_for_confirmation() {
		$this->send_response();
	}
	
	function send_response_curl() {

		$values=array();
		
		foreach($this->paypal_post_vars as $key => $value) {
    
    		// if magic quotes gpc is on, PHP added slashes to the values so we need
			// to strip them before we send the data back to Paypal.
			if(@get_magic_quotes_gpc())	$value = stripslashes($value);

			// make an array of URL encoded values
			$values[] = $key."=".urlencode($value);
		}

		$request = @implode("&", $values);
            $request .= "&cmd=_notify-validate";

 		//$ch = curl_init("http://www.eliteweaver.co.uk/cgi-bin/webscr");
   		$ch = curl_init("https://www.paypal.com/cgi-bin/webscr");

   		// debug settings
   		curl_setopt($ch, CURLOPT_VERBOSE, 1);
   		curl_setopt($ch, CURLOPT_HEADER, 1);      // to get response header in output
                 
   		curl_setopt($ch, CURLOPT_POST, 1);
   		curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
   		curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    	curl_setopt($ch, CURLOPT_POSTFIELDS, $request);
   		curl_setopt($ch, CURLOPT_TIMEOUT, 90);

    	$this->paypal_response = curl_exec($ch);
    	//echo $this->paypal_response."\n";

    	curl_close($ch);
	}

	// the same as above but without curl
	function send_response_http() {

		if(!($fp = @fsockopen("www.paypal.com", 80, &$errno, &$errstr, 120))) { 
    		echo "error<br>";
			$this->error_out("PHP fsockopen() error: " . $errstr);

		} else {

			$values=array();
			foreach($this->paypal_post_vars as $key => $value) {
				// if magic quotes gpc is on, PHP added slashes to the values so we need
				// to strip them before we send the data back to Paypal.
				if(@get_magic_quotes_gpc())	$value = stripslashes($value);
    			// make an array of URL encoded values
				$values[] = $key."=".urlencode($value);
			}

			// join the values together into one url encoded string
			$request = @implode("&", $values);

			// add paypal cmd variable
			$request .= "&cmd=_notify-validate";

			fputs($fp, "POST /cgi-bin/webscr HTTP/1.0\r\n" );
			fputs($fp, "Host: https://www.paypal.com\r\n" ); 
			if (isset($GLOBALS['HTTP_USER_AGENT']))
			fputs($fp, "User-Agent: ".$GLOBALS['HTTP_USER_AGENT'] ."\r\n" ); 
			fputs($fp, "Accept: */*\r\n" ); 
			fputs($fp, "Accept: image/gif\r\n" ); 
			fputs($fp, "Accept: image/x-xbitmap\r\n" ); 
			fputs($fp, "Accept: image/jpeg\r\n" ); 
			fputs($fp, "Content-type: application/x-www-form-urlencoded\r\n" ); 
			fputs($fp, "Content-length: " . strlen($request) . "\r\n\n" ); 

			// send url encoded string of data
			fputs($fp, "$request\n\r" ); 
			fputs($fp, "\r\n" );

			$this->send_time = time();
			$this->paypal_response = ""; 

			// get response from paypal
			while(!feof($fp)) { 
				$this->paypal_response .= fgets($fp, 1024); 
    			// waited too long?
				if($this->send_time < time()-$this->timeout)
					$this->error_out("Timed out waiting for a response from PayPal. ($this->timeout seconds)");
			}
			fclose( $fp );
		}
	} 
	
	function send_response() {
		if (extension_loaded("curl")) {
			$this->send_response_curl();
		} else {
			$this->send_response_http();
		}
	}

	// returns true if paypal says the order is good, false if not
	function is_verified() {
		return ereg("VERIFIED", $this->paypal_response);
	}

	// returns the paypal payment status
	function get_payment_status() {
		return $this->paypal_post_vars["payment_status"];
	}

	// writes error to logfile, exits script
	function error_out($message) {

		$date = date("D M j G:i:s T Y", time());

		// add on the data we sent:
		$message .= "\n\nThe following input was received from (and sent back to) PayPal:\n\n";

		@reset($this->paypal_post_vars);
		while(@list($key,$value) = @each($this->paypal_post_vars))
			$message .= $key . ':' . " \t$value\n";

		if( $this->error_email ) mail($this->error_email, "[$date] paypay_ipn error", $message, 'From : "'.$this->from_email.'"');
		exit();
	}

} // end class paypal_ipn

?>