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Edit File: Provider_Model_OAuth2.php

<?php
/**
* HybridAuth
* http://hybridauth.sourceforge.net | http://github.com/hybridauth/hybridauth
* (c) 2009-2014, HybridAuth authors | http://hybridauth.sourceforge.net/licenses.html 
*/

/**
 * To implement an OAuth 2 based service provider, Hybrid_Provider_Model_OAuth2
 * can be used to save the hassle of the authentication flow. 
 * 
 * Each class that inherit from Hybrid_Provider_Model_OAuth2 have to implement
 * at least 2 methods:
 *   Hybrid_Providers_{provider_name}::initialize()     to setup the provider api end-points urls
 *   Hybrid_Providers_{provider_name}::getUserProfile() to grab the user profile
 *
 * Hybrid_Provider_Model_OAuth2 use OAuth2Client v0.1 which can be found on
 * Hybrid/thirdparty/OAuth/OAuth2Client.php
 */
class Hybrid_Provider_Model_OAuth2 extends Hybrid_Provider_Model
{ 
	/**
	 * default permissions
	 * @var string
	 */
	public $scope = "";

/**
	* Try to get the error message from provider api
	* @param Numeric $code
	*/ 
	function errorMessageByStatus( $code = null ) { 
		$http_status_codes = ARRAY(
			200 => "OK: Success!",
			304 => "Not Modified: There was no new data to return.",
			400 => "Bad Request: The request was invalid.",
			401 => "Unauthorized.",
			403 => "Forbidden: The request is understood, but it has been refused.",
			404 => "Not Found: The URI requested is invalid or the resource requested does not exists.",
			406 => "Not Acceptable.", 
			500 => "Internal Server Error: Something is broken.",
			502 => "Bad Gateway.",
			503 => "Service Unavailable."
		);

if( ! $code && $this->api ) 
			$code = $this->api->http_code;

if( isset( $http_status_codes[ $code ] ) )
			return $code . " " . $http_status_codes[ $code ];
	}

// --------------------------------------------------------------------

/**
	* adapter initializer 
	*/
	function initialize() 
	{
		if ( ! $this->config["keys"]["id"] || ! $this->config["keys"]["secret"] ){
			throw new Exception( "Your application id and secret are required in order to connect to {$this->providerId}.", 4 );
		}

// override requested scope
		if( isset( $this->config["scope"] ) && ! empty( $this->config["scope"] ) ){
			$this->scope = $this->config["scope"];
		}

// include OAuth2 client
		require_once Hybrid_Auth::$config["path_libraries"] . "OAuth/OAuth2Client.php";

// create a new OAuth2 client instance
		$this->api = new OAuth2Client( $this->config["keys"]["id"], $this->config["keys"]["secret"], $this->endpoint );

// If we have an access token, set it
		if( $this->token( "access_token" ) ){
			$this->api->access_token            = $this->token( "access_token" );
			$this->api->refresh_token           = $this->token( "refresh_token" );
			$this->api->access_token_expires_in = $this->token( "expires_in" );
			$this->api->access_token_expires_at = $this->token( "expires_at" ); 
		}

// Set curl proxy if exist
		if( isset( Hybrid_Auth::$config["proxy"] ) ){
			$this->api->curl_proxy = Hybrid_Auth::$config["proxy"];
		}
	}

// --------------------------------------------------------------------

/**
	* begin login step 
	*/
	function loginBegin()
	{
		// redirect the user to the provider authentication url
		Hybrid_Auth::redirect( $this->api->authorizeUrl( array( "scope" => $this->scope ) ) ); 
	}

// --------------------------------------------------------------------

/**
	* finish login step 
	*/
	function loginFinish()
	{
		$error = (array_key_exists('error',$_REQUEST))?$_REQUEST['error']:"";

// check for errors
		if ( $error ){ 
			throw new Exception( "Authentication failed! {$this->providerId} returned an error: $error", 5 );
		}

// try to authenticate user
		$code = (array_key_exists('code',$_REQUEST))?$_REQUEST['code']:"";

try{
			$this->api->authenticate( $code ); 
		}
		catch( Exception $e ){
			throw new Exception( "User profile request failed! {$this->providerId} returned an error: $e", 6 );
		}

// check if authenticated
		if ( ! $this->api->access_token ){ 
			throw new Exception( "Authentication failed! {$this->providerId} returned an invalid access token.", 5 );
		}

// store tokens
		$this->token( "access_token" , $this->api->access_token  );
		$this->token( "refresh_token", $this->api->refresh_token );
		$this->token( "expires_in"   , $this->api->access_token_expires_in );
		$this->token( "expires_at"   , $this->api->access_token_expires_at );

// set user connected locally
		$this->setUserConnected();
	}
	
	function refreshToken()
	{
		// have an access token?
		if( $this->api->access_token ){

// have to refresh?
			if( $this->api->refresh_token && $this->api->access_token_expires_at ){

// expired?
				if( $this->api->access_token_expires_at <= time() ){ 
					$response = $this->api->refreshToken( array( "refresh_token" => $this->api->refresh_token ) );

if( ! isset( $response->access_token ) || ! $response->access_token ){
						// set the user as disconnected at this point and throw an exception
						$this->setUserUnconnected();

throw new Exception( "The Authorization Service has return an invalid response while requesting a new access token. " . (string) $response->error ); 
					}

// set new access_token
					$this->api->access_token = $response->access_token;

if( isset( $response->refresh_token ) ) 
					$this->api->refresh_token = $response->refresh_token;

if( isset( $response->expires_in ) ){
						$this->api->access_token_expires_in = $response->expires_in;

// even given by some idp, we should calculate this
						$this->api->access_token_expires_at = time() + $response->expires_in; 
					}
				}
			}

// re store tokens
			$this->token( "access_token" , $this->api->access_token  );
			$this->token( "refresh_token", $this->api->refresh_token );
			$this->token( "expires_in"   , $this->api->access_token_expires_in );
			$this->token( "expires_at"   , $this->api->access_token_expires_at );
		}
	}
}

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