aerys-oauth.php

<?php

$expectedState = ...; // oauth state to prevent CSRF

$url = Amp\Promise\wait(Amp\call(function () {
    $deferred = new Amp\Deferred;
    $deferredPromise = $deferred->promise();

    $host = (new Aerys\Host)
        ->name("localhost")
        ->expose("127.0.0.1", 8080)
        ->use(function (Aerys\Request $request, Aerys\Response $response) use ($expectedState, &$deferred) {
            if (!$deferred) {
                return;
            }

            if (hash_equals($request->getParam("state"), $expectedState)) {
                $deferred->resolve($request->getParam("code"));
                $deferred = null;
            }
        });

    $server = Aerys\initServer(new NullLogger, [$host]);
    yield $server->start();
    
    $code = yield Amp\Promise\first([
        $deferredPromise,
        new Amp\Delayed(30000), // <-- 30 second timeout, $code is null in case of a timeout
    ]);
    
    yield $server->stop();

    return $code;
}));