Paypal IPN stopped functioning as of March 13, 2013 - paypal

Question

I am using the script below. Everything was working perfectly fine until 3/13/2013.. I have been pulling my hair out for the past few hours and cannot find the problem at all...
<?php
/**
* PayPal IPN Listener
*
* A class to listen for and handle Instant Payment Notifications (IPN) from
* the PayPal server.
*
* https://github.com/Quixotix/PHP-PayPal-IPN
*
* #package PHP-PayPal-IPN
* #author Micah Carrick
* #copyright (c) 2012 - Micah Carrick
* #version 2.1.0
*/
class IpnListener {
/**
* 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 = true;
/**
* 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 = '';
private $response = '';
const PAYPAL_HOST = 'www.paypal.com';
const SANDBOX_HOST = 'www.sandbox.paypal.com';
/**
* Post Back Using cURL
*
* Sends the post back to PayPal using the cURL library. Called by
* the processIpn() method if the use_curl property is true. Throws an
* exception if the post fails. Populates the response, response_status,
* and post_uri properties on success.
*
* #param string The post data as a URL encoded string
*/
protected function curlPost($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) {
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";
$header .= "Connection: Close\r\n";
fputs($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() {
$r = '';
// date and POST url
for ($i=0; $i<80; $i++) { $r .= '-'; }
$r .= "\n[".date('m/d/Y g:i A').'] - '.$this->getPostUri();
if ($this->use_curl) $r .= " (curl)\n";
else $r .= " (fsockopen)\n";
// HTTP Response
for ($i=0; $i<80; $i++) { $r .= '-'; }
$r .= "\n{$this->getResponse()}\n";
// POST vars
for ($i=0; $i<80; $i++) { $r .= '-'; }
$r .= "\n";
foreach ($this->post_data as $key => $value) {
$r .= str_pad($key, 25)."$value\n";
}
$r .= "\n\n";
return $r;
}
/**
* Process IPN
*
* Handles the IPN post back to PayPal and parsing the response. Call this
* method from your IPN listener script. Returns true if the response came
* back as "VERIFIED", false if the response came back "INVALID", and
* throws an exception if there is an error.
*
* #param array
*
* #return boolean
*/
public function processIpn($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.");
}
}
}

Answer 1

Look at this link. It seems Paypal changed IPN codes. I'm no expert on this but been struggling to get this resolved until I stumbled upon that link. It seem to be working now, my only problem is the MySQL insert Into code which doesn't seem to insert new record.
http://www.johnboy.com/blog/http-11-paypal-ipn-example-php-code

Answer 2

I had the same problem here, PayPal IPN Listener won't work anymore and found this fix, that maybe can help you.
at near of the end of your IPN Listener,
if (strpos($this->response, "VERIFIED") !== false) {
return true;
} elseif (strpos($this->response, "INVALID") !== false) {
return false;
} else {
throw new Exception("Unexpected response from PayPal.");
}
change "!== false" with "== 0" (equal to zero); in both IF conditions. It works for me!
Now I've just written my ask/self-answer that i've linked up and wait some programmer more experienced than me can confirm and explain this problem (and if I have done right).