public function validate(Vanilla\Request $request, Vanilla\User $user = null, Vanilla\Config $config = null)
 {
     $signature = md5($request->getTimestamp() . $config->getSecret());
     if ($request->getSignature() != $signature) {
         return new Response\InvalidSignature($request);
     }
 }
 public function testGetSecret()
 {
     $config = new Config(['clientID' => 1234, 'secret' => 'abcde']);
     $this->assertEquals('abcde', $config->getSecret());
 }