App\Http\Controllers\BotController::authenticate PHP Method

    private function authenticate($input)
    {
        $token = isset($_SERVER['HTTP_AUTHORIZATION']) ? $_SERVER['HTTP_AUTHORIZATION'] : false;
        if (Utils::isNinjaDev()) {
            // skip validation for testing
        } elseif (!$this->validateToken($token)) {
            return false;
        }
        if ($token = Cache::get('msbot_token')) {
            return $token;
        }
        $clientId = env('MSBOT_CLIENT_ID');
        $clientSecret = env('MSBOT_CLIENT_SECRET');
        $scope = 'https://graph.microsoft.com/.default';
        $data = sprintf('grant_type=client_credentials&client_id=%s&client_secret=%s&scope=%s', $clientId, $clientSecret, $scope);
        $response = CurlUtils::post(MSBOT_LOGIN_URL, $data);
        $response = json_decode($response);
        $expires = $response->expires_in / 60 - 5;
        Cache::put('msbot_token', $response->access_token, $expires);
        return $response->access_token;
    }