Kelunik\AcmeClient\Stores\ChallengeStore::doPut PHP Method

    private function doPut($token, $payload, $user = null)
    {
        Assert::string($token, "Token must be a string. Got: %s");
        Assert::string($payload, "Payload must be a string. Got: %s");
        Assert::nullOrString($user, "User must be a string or null. Got: %s");
        $path = $this->docroot . "/.well-known/acme-challenge";
        $realpath = realpath($path);
        if (!realpath($this->docroot)) {
            throw new ChallengeStoreException("Document root doesn't exist: '{$this->docroot}'");
        }
        if (!$realpath && !@mkdir($path, 0755, true)) {
            throw new ChallengeStoreException("Couldn't create public directory to serve the challenges: '{$path}'");
        }
        if ($user) {
            if (!($userInfo = posix_getpwnam($user))) {
                throw new ChallengeStoreException("Unknown user: '{$user}'");
            }
        }
        if (isset($userInfo)) {
            (yield \Amp\File\chown($this->docroot . "/.well-known", $userInfo["uid"], -1));
            (yield \Amp\File\chown($this->docroot . "/.well-known/acme-challenge", $userInfo["uid"], -1));
        }
        (yield \Amp\File\put("{$path}/{$token}", $payload));
        if (isset($userInfo)) {
            (yield \Amp\File\chown("{$path}/{$token}", $userInfo["uid"], -1));
        }
        (yield \Amp\File\chmod("{$path}/{$token}", 0644));
    }