/**
* Process HTTP request object and prepare for token validation
*
* @param RequestInterface $httpRequest
* @return array
*/
public function prepareRequest($httpRequest)
{
$oauthParams = $this->_processRequest($httpRequest->getHeader('Authorization'), $httpRequest->getHeader(\Zend_Http_Client::CONTENT_TYPE), $httpRequest->getContent(), $this->getRequestUrl($httpRequest));
return $oauthParams;
}