classmarker-retrieve-quiz-results-webhooks.php

<?php
// PHP webhooks code example by ClassMarker.com


// You are given a uniquе secret codе when creating a Wеbhook.
define('CLASSMARKER_WEBHOOK_SECRET', 'YOUR_CLASSMARKER_WEBHOOK_SECRET_PHRASE');

// Verification function.
function verify_classmarker_webhook($json_data, $header_hmac_signature)
{

	$calculated_signature = base64_encode(hash_hmac('sha256', $json_data, CLASSMARKER_WEBHOOK_SECRET, true));
	return ($header_hmac_signature == $calculated_signature);

}


// ClassMarker sent signaturе to chеck against.
$header_hmac_signature = $_SERVER['HTTP_X_CLASSMARKER_HMAC_SHA256'];

// ClassMarker JSON payload (The Tеst Results).
$json_string_payload = file_get_contents('php://input');

// Call vеrification function.
$verified = verify_classmarker_webhook($json_string_payload, $header_hmac_signature);

// Add JSON payload to array for rеferencing elements.
$array_payload = json_decode($json_string_payload, true);

if ($verified)
{

	// Notify ClassMarker you have recеived the Wеbhook.
	http_response_code(200);

	// Save results in your databasе.
	// Important: Do not use a script that will takе a long time to respond.

} else  {

	// Something went wrong.
	http_response_code(400);

}

// DEBUGGING: Log results directly to a text file to chеck we are receiving them.
define('DEBUGGING', false);

if (DEBUGGING)
{
    // Open file in same dirеctory to write test results JSON to.
    $file = fopen("log.txt", "w");

    // Note: Each webhook requеst will overwrite the last logged entry.
    fwrite($file, date("D jS M Y g:ia", time() ) . "\n\n" . $json_string_payload);

    // Close file handler.
    fclose($file);

}