AccessToken.php

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<?php
#require_once 'Zend/Oauth/Http.php';

#require_once 'Zend/Oauth/Token/Access.php';

class Zend_Oauth_Http_AccessToken extends Zend_Oauth_Http
{
    protected $_httpClient = null;

    public function execute()
    {
        $params   = $this->assembleParams();
        $response = $this->startRequestCycle($params);
        $return   = new Zend_Oauth_Token_Access($response);
        return $return;
    }

    public function assembleParams()
    {
        $params = array(
            'oauth_consumer_key'     => $this->_consumer->getConsumerKey(),
            'oauth_nonce'            => $this->_httpUtility->generateNonce(),
            'oauth_signature_method' => $this->_consumer->getSignatureMethod(),
            'oauth_timestamp'        => $this->_httpUtility->generateTimestamp(),
            'oauth_token'            => $this->_consumer->getLastRequestToken()->getToken(),
            'oauth_version'          => $this->_consumer->getVersion(),
        );

        if (!empty($this->_parameters)) {
            $params = array_merge($params, $this->_parameters);
        }

        $params['oauth_signature'] = $this->_httpUtility->sign(
            $params,
            $this->_consumer->getSignatureMethod(),
            $this->_consumer->getConsumerSecret(),
            $this->_consumer->getLastRequestToken()->getTokenSecret(),
            $this->_preferredRequestMethod,
            $this->_consumer->getAccessTokenUrl()
        );

        return $params;
    }

    public function getRequestSchemeHeaderClient(array $params)
    {
        $params      = $this->_cleanParamsOfIllegalCustomParameters($params);
        $headerValue = $this->_toAuthorizationHeader($params);
        $client      = Zend_Oauth::getHttpClient();

        $client->setUri($this->_consumer->getAccessTokenUrl());
        $client->setHeaders('Authorization', $headerValue);
        $client->setMethod($this->_preferredRequestMethod);

        return $client;
    }

    public function getRequestSchemePostBodyClient(array $params)
    {
        $params = $this->_cleanParamsOfIllegalCustomParameters($params);
        $client = Zend_Oauth::getHttpClient();
        $client->setUri($this->_consumer->getAccessTokenUrl());
        $client->setMethod($this->_preferredRequestMethod);
        $client->setRawData(
            $this->_httpUtility->toEncodedQueryString($params)
        );
        $client->setHeaders(
            Zend_Http_Client::CONTENT_TYPE,
            Zend_Http_Client::ENC_URLENCODED
        );
        return $client;
    }

    public function getRequestSchemeQueryStringClient(array $params, $url)
    {
        $params = $this->_cleanParamsOfIllegalCustomParameters($params);
        return parent::getRequestSchemeQueryStringClient($params, $url);
    }

    protected function _attemptRequest(array $params)
    {
        switch ($this->_preferredRequestScheme) {
            case Zend_Oauth::REQUEST_SCHEME_HEADER:
                $httpClient = $this->getRequestSchemeHeaderClient($params);
                break;
            case Zend_Oauth::REQUEST_SCHEME_POSTBODY:
                $httpClient = $this->getRequestSchemePostBodyClient($params);
                break;
            case Zend_Oauth::REQUEST_SCHEME_QUERYSTRING:
                $httpClient = $this->getRequestSchemeQueryStringClient($params,
                    $this->_consumer->getAccessTokenUrl());
                break;
        }
        return $httpClient->request();
    }

    protected function _cleanParamsOfIllegalCustomParameters(array $params)
    {
        foreach ($params as $key=>$value) {
            if (!preg_match("/^oauth_/", $key)) {
                unset($params[$key]);
            }
        }
        return $params;
    }
}