A simple system for creating multiple-choice questions for an audience to answer on their phones. Responses are tallied and displayed in real-time. https://openquestion.netsyms.com
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<?php
/**
* This file contains global settings and utility functions.
*/
ob_start(); // allow sending headers after content
// Unicode, solves almost all stupid encoding problems
header('Content-Type: text/html; charset=utf-8');
// l33t $ecurity h4x
header('X-Content-Type-Options: nosniff');
header('X-XSS-Protection: 1; mode=block');
header('X-Powered-By: PHP'); // no versions makes it harder to find vulns
header('X-Frame-Options: "DENY"');
header('Referrer-Policy: "no-referrer, strict-origin-when-cross-origin"');
$SECURE_NONCE = base64_encode(random_bytes(8));
session_start(); // stick some cookies in it
header("Content-Security-Policy: "
. "default-src 'self';"
. "object-src 'none'; "
. "img-src * data:; "
. "media-src 'self'; "
. "frame-src 'none'; "
. "font-src 'self'; "
. "connect-src *; "
. "style-src 'self' 'nonce-$SECURE_NONCE'; "
. "script-src 'self' 'nonce-$SECURE_NONCE'");
//
// Composer
require __DIR__ . '/vendor/autoload.php';
// Settings file
require __DIR__ . '/settings.php';
if (!DEBUG) {
error_reporting(0);
} else {
error_reporting(E_ALL);
ini_set('display_errors', 'On');
}
/**
* Kill off the running process and spit out an error message
* @param string $error error message
*/
function sendError($error) {
global $SECURE_NONCE;
die("<!DOCTYPE html>"
. "<meta charset=\"UTF-8\">"
. "<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">"
. "<title>Error</title>"
. "<style nonce=\"" . $SECURE_NONCE . "\">"
. "h1 {color: red; font-family: sans-serif; font-size: 20px; margin-bottom: 0px;} "
. "h2 {font-family: sans-serif; font-size: 16px;} "
. "p {font-family: monospace; font-size: 14px; width: 100%; wrap-style: break-word;} "
. "i {font-size: 12px;}"
. "</style>"
. "<h1>A fatal application error has occurred.</h1>"
. "<i>(This isn't your fault.)</i>"
. "<h2>Details:</h2>"
. "<p>" . htmlspecialchars($error) . "</p>");
}
// Database settings
// Also inits database and stuff
use Medoo\Medoo;
$database;
try {
$database = new Medoo([
'database_type' => DB_TYPE,
'database_name' => DB_NAME,
'server' => DB_SERVER,
'username' => DB_USER,
'password' => DB_PASS,
'charset' => DB_CHARSET
]);
} catch (Exception $ex) {
//header('HTTP/1.1 500 Internal Server Error');
sendError("Database error. Try again later. $ex");
}
$VARS;
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
$VARS = $_POST;
define("GET", false);
} else {
$VARS = $_GET;
define("GET", true);
}