CZI_presence_detector/public/update.php

67 lines
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PHP
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2023-08-12 17:23:33 +02:00
<?php
$secret_key = 'CHANGE-THIS';
$present_file = 'present.json';
// check for POST request
if ($_SERVER['REQUEST_METHOD'] != 'POST') {
error_log('FAILED - not POST - '. $_SERVER['REQUEST_METHOD']);
http_response_code(405);
exit();
}
// get content type
$content_type = isset($_SERVER['CONTENT_TYPE']) ? strtolower(trim($_SERVER['CONTENT_TYPE'])) : '';
if ($content_type != 'application/json') {
error_log('FAILED - not application/json - '. $content_type);
http_response_code(400);
exit();
}
// get payload
$payload = trim(file_get_contents("php://input"));
if (empty($payload)) {
error_log('FAILED - no payload');
http_response_code(400);
exit();
}
// get header signature
$header_signature = isset($_SERVER['HTTP_X_HMAC_HASH']) ? $_SERVER['HTTP_X_HMAC_HASH'] : '';
if (empty($header_signature)) {
error_log('FAILED - header signature missing');
http_response_code(401);
exit();
}
// calculate payload signature
$payload_signature = hash_hmac('sha256', $payload, $secret_key, false);
// check payload signature against header signature
if ($header_signature !== $payload_signature) {
error_log('FAILED - payload signature');
http_response_code(401);
exit();
}
// convert json to array
$decoded = json_decode($payload, true);
// check for json decode errors
if (json_last_error() !== JSON_ERROR_NONE) {
error_log('FAILED - json decode - '. json_last_error());
http_response_code(400);
exit();
}
// success, do something
http_response_code(200);
$present = array(
"timestamp" => time(),
"identities" => $decoded
);
file_put_contents($present_file, json_encode($present));