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<?php
session_start();
function main() {
if ($_SERVER["REQUEST_METHOD"] == "POST"
&& $_SERVER["REQUEST_URI"] == "/submit") {
if (!isset($_SESSION["expiry"])) {
echo "Invalid session!";
return;
}
if (time() > $_SESSION["expiry"]) {
echo "You're too slow!";
return;
}
if (intval($_POST["next"]) != $_SESSION["next"]) {
echo "Wrong prediction!";
return;
}
echo "FLAG " . getenv("FLAG");
} else {
srand(random_int(0, 4294967295));
$t = time();
echo strval($t) . "\n";
echo strval(rand()) . "\n";
for ($i = 0; $i < 300; $i++) {
if (($i % 60) == ($t % 60)) {
echo strval(rand()) . "\n";
} else {
rand();
}
}
$_SESSION["next"] = rand();
$_SESSION["expiry"] = time() + 60;
echo "Good luck :P";
}
}
main();
?>
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