0) {
$numCharacters = 26 + 26 + 10; // a-z + A-Z + 0-9
for ($i = 0; $i < $length; $i++) {
try {
$num = random_int(0, $numCharacters - 1);
} catch (Exception $e) {
$num = rand(0, $numCharacters - 1);
}
if ($num < 26) $randomString .= chr(ord('a') + $num);
else if ($num - 26 < 26) $randomString .= chr(ord('A') + $num - 26);
else $randomString .= chr(ord('0') + $num - 26 - 26);
}
}
return $randomString;
}
function startsWith($haystack, $needle) {
$length = strlen($needle);
return (substr($haystack, 0, $length) === $needle);
}
function endsWith($haystack, $needle) {
$length = strlen($needle);
if ($length == 0)
return true;
return (substr($haystack, -$length) === $needle);
}
function intendCode($code, $escape = true) {
$newCode = "";
$first = true;
$brackets = array();
$intend = 0;
foreach (explode("\n", $code) as $line) {
if (!$first) $newCode .= "\n";
if ($escape) $line = htmlspecialchars($line);
$line = trim($line);
if (count($brackets) > 0 && startsWith($line, current($brackets))) {
$intend = max(0, $intend - 2);
array_pop($brackets);
}
$newCode .= str_repeat(" ", $intend);
$newCode .= $line;
$first = false;
if (endsWith($line, "{")) {
$intend += 2;
array_push($brackets, "}");
} else if (endsWith($line, "(")) {
$intend += 2;
array_push($brackets, ")");
}
}
return $newCode;
}
function replaceCssSelector($sel) {
return preg_replace("~[.#<>]~", "_", preg_replace("~[:\-]~", "", $sel));
}
function getClassPath($class, $suffix = true) {
$path = str_replace('\\', '/', $class);
$path = array_values(array_filter(explode("/", $path)));
if (strcasecmp($path[0], "api") === 0 && count($path) > 2 && strcasecmp($path[1], "Parameter") !== 0) {
$path = "Api/" . $path[1] . "API";
} else {
$path = implode("/", $path);
}
$suffix = ($suffix ? ".class" : "");
return "core/$path$suffix.php";
}
function createError($msg) {
return json_encode(array("success" => false, "msg" => $msg));
}
function serveStatic(string $webRoot, string $file) {
$path = realpath($webRoot . "/" . $file);
if (!startsWith($path, $webRoot . "/")) {
http_response_code(406);
return "Access restricted, requested file outside web root: " . htmlspecialchars($path);
}
if (!file_exists($path) || !is_file($path) || !is_readable($path)) {
http_response_code(500);
return "Unable to read file: " . htmlspecialchars($path);
}
$pathInfo = pathinfo($path);
// TODO: add more file extensions here
$allowedExtension = array("html", "htm");
$ext = $pathInfo["extension"] ?? "";
if (!in_array($ext, $allowedExtension)) {
http_response_code(406);
return "Access restricted: Extension '" . htmlspecialchars($ext) . "' not allowed.";
}
$size = filesize($path);
$mimeType = mime_content_type($path);
header("Content-Type: $mimeType"); // TODO: do we need to check mime type?
header("Content-Length: $size");
header('Accept-Ranges: bytes');
if (strcasecmp($_SERVER["REQUEST_METHOD"], "HEAD") !== 0) {
$bufferSize = 1024*16;
$handle = fopen($path, "rb");
if($handle === false) {
http_response_code(500);
return "Unable to read file: " . htmlspecialchars($path);
}
$offset = 0;
$length = $size;
if (isset($_SERVER['HTTP_RANGE'])) {
$partialContent = true;
preg_match('/bytes=(\d+)-(\d+)?/', $_SERVER['HTTP_RANGE'], $matches);
$offset = intval($matches[1]);
$length = intval($matches[2]) - $offset;
http_response_code(206);
header('Content-Range: bytes ' . $offset . '-' . ($offset + $length) . '/' . $size);
}
if ($offset > 0) {
fseek($handle, $offset);
}
$bytesRead = 0;
while (!feof($handle) && $bytesRead < $length) {
$chunkSize = min($length - $bytesRead, $bufferSize);
echo fread($handle, $chunkSize);
}
fclose($handle);
}
return "";
}