Cakephp 3 Paypal IPN not reading post data - php

Question

I have integrated Paypal IPN into my Cakephp but no matter what I do, the file_get_contents('php://input') function is not reading the data coming back from the Paypal.
If I run the same code natively outside the Cakephp framework, it works perfectly.
In my error log, the last text I get says [2017-06-16 17:19 UTC] Invalid IPN: cmd=_notify-validate
Any ideas as to what I'm doing wrong? Thanks in advance.
public function jawaab()
{
define("DEBUG", 1);
// Set to 0 once you're ready to go live
define("USE_SANDBOX", 1);
define("LOG_FILE", "master_error.log");
// Read POST data
// reading posted data directly from $_POST causes serialization
// issues with array data in POST. Reading raw POST data from input stream instead.
$raw_post_data = file_get_contents('php://input');
$raw_post_array = explode('&', $raw_post_data);
$counter = 0;
$myPost = array();
foreach ($raw_post_array as $keyval) {
$keyval = explode ('=', $keyval);
if (count($keyval) == 2)
$myPost[$keyval[0]] = urldecode($keyval[1]);
}
// read the post from PayPal system and add 'cmd'
$req = 'cmd=_notify-validate';
if(function_exists('get_magic_quotes_gpc')) {
$get_magic_quotes_exists = true;
}
foreach ($myPost as $key => $value) {
if($get_magic_quotes_exists == true && get_magic_quotes_gpc() == 1) {
$value = urlencode(stripslashes($value));
} else {
$value = urlencode($value);
}
$req .= "&$key=$value";
}
// Post IPN data back to PayPal to validate the IPN data is genuine
// Without this step anyone can fake IPN data
if(USE_SANDBOX == true) {
$paypal_url = "https://www.sandbox.paypal.com/cgi-bin/webscr";
} else {
$paypal_url = "https://www.paypal.com/cgi-bin/webscr";
}
$ch = curl_init($paypal_url);
if ($ch == FALSE) {
return FALSE;
}
curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $req);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
curl_setopt($ch, CURLOPT_FORBID_REUSE, 1);
if(DEBUG == true) {
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLINFO_HEADER_OUT, 1);
}
// CONFIG: Optional proxy configuration
//curl_setopt($ch, CURLOPT_PROXY, $proxy);
//curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, 1);
// Set TCP timeout to 30 seconds
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Connection: Close'));
// This is mandatory for some environments.
//$cert = __DIR__ . "./cacert.pem";
//curl_setopt($ch, CURLOPT_CAINFO, $cert);
$res = curl_exec($ch);
if (curl_errno($ch) != 0) // cURL error
{
if(DEBUG == true) {
error_log(date('[Y-m-d H:i e] '). "Can't connect to PayPal to validate IPN message: " . curl_error($ch) . PHP_EOL, 3, LOG_FILE);
}
curl_close($ch);
exit;
} else {
// Log the entire HTTP response if debug is switched on.
if(DEBUG == true) {
error_log(date('[Y-m-d H:i e] '). "HTTP request of validation request:". curl_getinfo($ch, CURLINFO_HEADER_OUT) ." for IPN payload: $req" . PHP_EOL, 3, LOG_FILE);
error_log(date('[Y-m-d H:i e] '). "HTTP response of validation request: $res" . PHP_EOL, 3, LOG_FILE);
}
curl_close($ch);
}
// Inspect IPN validation result and act accordingly
// Split response headers and payload, a better way for strcmp
$tokens = explode("\r\n\r\n", trim($res));
$res = trim(end($tokens));
if ($res == "VERIFIED"){
error_log("\r\n\r\n I AM IN -- \r\n\r\n " . PHP_EOL, 3, LOG_FILE);
// assign posted variables to local variables
$item_name = $_POST['item_name'];
$item_number = $_POST['item_number'];
$payment_status = $_POST['payment_status'];
$payment_amount = $_POST['mc_gross'];
$payment_currency = $_POST['mc_currency'];
$txn_id = $_POST['txn_id'];
$receiver_email = $_POST['receiver_email'];
$payer_email = $_POST['payer_email'];
// include("dbcontroller.php");
// $db = new DBController();
// check whether the payment_status is Completed
$isPaymentCompleted = false;
if($payment_status == "Completed") {
$isPaymentCompleted = true;
}
// check that txn_id has not been previously processed
$isUniqueTxnId = false;
$result = $this->Payments->find('all', ['conditions' => ['txn_id = ' => '$txn_id' ]]);
if(empty($result)) {
$isUniqueTxnId = true;
}
// check that receiver_email is your PayPal email
// check that payment_amount/payment_currency are correct
if($isPaymentCompleted && $isUniqueTxnId) {
$paymentsTable = TableRegistry::get('Payments');
$paymnt = $paymentsTable->newEntity();
$paymnt->booking_id = $item_number;
$paymnt->item_name = $item_name;
$paymnt->payment_status = $payment_status;
$paymnt->payment_amount = $payment_amount;
$paymnt->payment_currency = $payment_currency;
$paymnt->txn_id = $txn_id;
if ($paymentsTable->save($paymnt)) {
// The $payment entity contains the id now
$id = $paymnt->id;
}
if(($paymentsTable->save($paymnt)))
{
$bookingsTable = TableRegistry::get('Bookings');
$bookngs = $bookingsTable->get($item_number); // Return article with id 12
$bookngs->status = 1;
$bookingsTable->save($bookngs);
}
// else
//{
// $errori = $qry;
//}
}
else
{
error_log(date('[Y-m-d H:i e] '). "\r\n\r\n Something is not true - $isPaymentCompleted -- $isUniqueTxnId -- \r\n\r\n " . PHP_EOL, 3, LOG_FILE);
}
// process payment and mark item as paid.
if(DEBUG == true) {
error_log(date('[Y-m-d H:i e] '). "Verified IPN: $req $errori". PHP_EOL, 3, LOG_FILE);
}
}
else
{
error_log("\r\n\r\n $res $counter \r\n\r\n". PHP_EOL, 3, LOG_FILE);
$counter = $counter+1;
}
if (strcmp ($res, "INVALID") == 0) {
// log for manual investigation
// Add business logic here which deals with invalid IPN messages
if(DEBUG == true) {
error_log(date('[Y-m-d H:i e] '). "Invalid IPN: $req $errori" . PHP_EOL, 3, LOG_FILE);
}
}
}