A PHP script for sending URLs to NextDNS deny/allow lists

next.php

<?php

$requestBody = $_REQUEST;

$token = 'INSERT-YOUR-VALUES-HERE';
$apiKey = 'INSERT-YOUR-VALUES-HERE';
$profileId = 'INSERT-YOUR-VALUES-HERE';

$requred = ['token', 'action', 'domain'];

foreach ($requred as $key) {
    if (!isset($requestBody[$key])) {
        send(json_encode(array('error' => $key . ' is required')));
    }
}

if ($requestBody['token'] != $token) {
    send(json_encode(array('error' => 'Invalid token')));
}

$action = $requestBody['action'];

switch ($action) {
    case 'block':
        send(make_request('deny', $requestBody['domain']));
        break;
    case 'allow':
        send(make_request('allow', $requestBody['domain']));
        break;
}

function send($response) {
    header('Content-Type: application/json');
    echo $response;
    exit();
}

function make_request(string $allowOrDeny, string $domain) {
    global $apiKey, $profileId;

    $curl = curl_init();
    $allowOrDeny .= 'list';

    curl_setopt_array($curl, [
        CURLOPT_URL => "https://api.nextdns.io/profiles/$profileId/$allowOrDeny",
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_ENCODING => "",
        CURLOPT_MAXREDIRS => 10,
        CURLOPT_TIMEOUT => 30,
        CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
        CURLOPT_CUSTOMREQUEST => "POST",
        CURLOPT_POSTFIELDS => "{\n\t\"id\": \"$domain\",\n\t\"active\": true\n}",
        CURLOPT_HTTPHEADER => [
            "Content-Type: application/json",
            "X-Api-Key: $apiKey"
        ]
    ]);

    $response = curl_exec($curl);
    $err = curl_error($curl);

    curl_close($curl);

    if ($err) {
        echo "cURL Error #:" . $err;
    } else {
        echo $response;
    }
    
    return $response;
}