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<?php
session_name("a3e0f0ee-9f5a-4be2-88cb-3b7ceb626d00");
session_start();
function get(string $id, string $name): ?string {
$file = __DIR__ . "/../_runners/$id/results/" . $name;
if (!is_file($file))
return null;
return file_get_contents($file);
}
function csrf_token(): string {
return $_SESSION["csrf-token"] = base64_encode(random_bytes(30));
}
function getid(): string {
return str_pad(bin2hex(random_bytes(16)), 32, "0", STR_PAD_LEFT);
}
function delTree($dir) {
foreach (scandir($dir) as $ent) {
if ($ent === "." || $ent === "..")
continue;
$path = $dir . DIRECTORY_SEPARATOR . $ent;
if (is_dir($path))
delTree($path);
else
unlink($path);
}
return rmdir($dir);
}
function file_cachebuster(string $filename): string {
return htmlentities(urlencode(md5(
strval(filemtime($filename)) .
strval(filesize($filename))
)));
}
$defaultCode = <<<java
public class Program {
public static void main(String[] args) {
// Your code here
System.out.println("Hello, world!");
}
}
java;
const CODE_MAXLENGTH = 16383;
$code = null;
if (!empty($_GET["c"])) {
$compressedCode = @base64_decode($_GET["c"], true);
if ($compressedCode !== false) {
$uncompressedCode = @gzinflate($compressedCode, CODE_MAXLENGTH);
if ($compressedCode !== false) {
$code = &$uncompressedCode;
}
}
}
$result = null;
if (isset($_POST["code"]) && strlen($_POST["code"]) <= CODE_MAXLENGTH) {
header("Content-Type: application/json");
$code = $_POST["code"];
$csrf = $_POST["csrf"] ?? null;
if ($csrf === null || $csrf !== $_SESSION["csrf-token"]) {
echo json_encode([
"ok" => false,
"message" => "CSRF token mismatch",
"csrf" => csrf_token(),
]);
exit;
}
if (($_POST["permalink"] ?? "") === "1") {
echo json_encode([
"ok" => true,
"data" => base64_encode(gzdeflate($code, 9, ZLIB_ENCODING_RAW)),
]);
exit;
}
$id = getid();
$runnerDir = __DIR__ . "/../_runners/$id";
$srcDir = $runnerDir . "/src";
mkdir($srcDir, recursive: true);
file_put_contents($srcDir . "/Program.java", $code);
$isInDocker = getenv("IS_IN_DOCKER") === "1";
if ($isInDocker)
file_put_contents("php://stderr", "[debug] In Docker\n");
chdir(__DIR__ . "/..");
$stderrFile = sys_get_temp_dir() . "/tmp{$id}.2";
exec(
($isInDocker ? "su-exec root " : "") .
"./compile-and-run.sh '$id' Program 2>'$stderrFile'", $resultStr, $code);
$resultStr = implode("\n", $resultStr);
if (is_file($stderrFile)) {
$stderrContents = file_get_contents($stderrFile);
unlink($stderrFile);
if (!empty($stderrContents)) {
file_put_contents("php://stderr", "compile-and-run.sh failed: $stderrContents\n");
if ($code != 0) {
echo json_encode([
"ok" => false,
"message" => "Execution failed:\n$stderrContents",
"csrf" => csrf_token(),
]);
delTree($runnerDir);
exit;
}
}
}
chdir(__DIR__);
file_put_contents("php://stderr", "result: $result\n");
$csrf = csrf_token();
$result = [
"compile" => [
"status" => get($id, "c.s"),
"stdout" => get($id, "c.0"),
"stderr" => get($id, "c.1"),
],
"run" => [
"status" => get($id, "r.s"),
"stdout" => get($id, "r.0"),
"stderr" => get($id, "r.1"),
],
"runner" => $id,
"ok" => true,
"csrf" => $csrf,
];
if ($isInDocker)
exec("su-exec root rm -rf '$runnerDir'");
else
delTree($runnerDir);
echo json_encode($result);
exit;
}
$csrf = csrf_token();
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Java</title>
<link rel="stylesheet" href="dist/codemirror.css">
<link rel="stylesheet" href="dist/eclipse.css">
<link rel="stylesheet" href="site.css?_=<?= file_cachebuster(__DIR__ . "/site.css") ?>">
<script src="dist/jquery-1.12.4.min.js"></script>
<script src="dist/codemirror.js"></script>
<script src="dist/clike.js"></script>
<script src="site.js?_=<?= file_cachebuster(__DIR__ . "/site.js") ?>"></script>
</head>
<body>
<div id="loader" style="display: none;">
<div id="spinner"></div>
</div>
<h1>☕️ Java Compiler</h1>
<p>Powered by Eclipse Temurin 23.</p>
<p>
<strong>Limitations:</strong>
Compilation and execution time is limited to 30 seconds each.
Your program won't have any network access and RAM is limited to 32 MiB.
Source code size is limited to 16 KiB. Files will not be persisted between executions.
Your program's main method needs to be contained inside a class named <code>Program</code>,
as the code gets written to a file named <code>Program.java</code>.
</p>
<form method="POST">
<input name="csrf" id="csrf-token" type="hidden" value="<?= htmlentities($csrf) ?>">
<textarea maxlength="<?= CODE_MAXLENGTH ?>" id="editor" name="code" rows="20"><?= htmlentities($code ?? $defaultCode) ?></textarea>
<div id="toolbar">
<button type="submit">▶️ Compile & run</button>
<button type="button" id="dlCodeButton">💾️ Download code as file</button>
<button type="button" id="permalink">🔗️ Permalink</button>
</div>
</form>
<div id="output" style="display: none;"></div>
<div id="footer">
© <?= date("Y") ?> <a href="https://jkohl.link/" target="_blank">Jonas Kohl</a>.
<a href="https://git.jkohl.link/online-java-compiler.git" target="_blank">Source code</a>.
<a href="javascript:;" id="toggleFullWidth">Toggle full width</a>
</div>
</body>
</html>
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