jgoogleapi Follow @yiiframework

// application components
    'components' => array(
        'JGoogleAPI' => array(
            'class' => 'ext.JGoogleAPI.JGoogleAPI',
            //Default authentication type to be used by the extension
            'defaultAuthenticationType'=>'serviceAPI',
 
            //Account type Authentication data
            'serviceAPI' => array(
                'clientId' => 'YOUR_SERVICE_ACCOUNT_CLIENT_ID',
                'clientEmail' => 'YOUR_SERVICE_ACCOUNT_CLIENT_EMAIL',
                'keyFilePath' => 'THE_PATH_TO_YOUR_KEY_FILE',
            ),
            /*
            //You can define one of the authentication types or both (for a Service Account or Web Application Account) 
            webAppAPI = array(
                'clientId' => 'YOUR_WEB_APPLICATION_CLIENT_ID',
                'clientEmail' => 'YOUR_WEB_APPLICATION_CLIENT_EMAIL',
                'clientSecret' => 'YOUR_WEB_APPLICATION_CLIENT_SECRET',
                'redirectUri' => 'YOUR_WEB_APPLICATION_REDIRECT_URI',
                'javascriptOrigins' => 'YOUR_WEB_APPLICATION_JAVASCRIPT_ORIGINS',
            ),
            */
            'simpleApiKey' => 'YOUR_SIMPLE_API_KEY',
 
            //Scopes needed to access the API data defined by authentication type
            'scopes' => array(
                'serviceAPI' => array(
                    'drive' => array(
                        'https://www.googleapis.com/auth/drive.file',
                    ),
                ),
                'webappAPI' => array(
                    'drive' => array(
                        'https://www.googleapis.com/auth/drive.file',
                    ),
                ),
            ),
            //Use objects when retriving data from api if true or an array if false
            'useObjects'=>true,
        ),
        ...
    ),

$service = Yii::app()->JGoogleAPI->getService('Drive');
 
    or
 
    $service = Yii::app()->JGoogleAPI->getService('Drive','webappAPI');
    //if the authentication type is diferent of the default

$file = Yii::app()->JGoogleAPI->getObject('DriveFile','Drive');
    //we pass the object name that we want to create and the service where it belongs
 
    //or
 
    $file = Yii::app()->JGoogleAPI->getObject('DriveFile','Drive','webappAPI');
    //if the authentication type is different of the default

//Create an extension Instance
    $jgoogleapi = Yii::app()->JGoogleAPI;
 
    try {
        if(!isset(Yii::app()->session['auth_token'])) {
            //Get the instance of the client from the api
            $client = $jgoogleapi->getClient();
            //or
            //$client = Yii::app()->JGoogleAPI->getClient();    #Without creating an extension instance            
 
            //Web Application User authentication
            //You want to use a persistence layer like the DB or memcached to store the token for the current user
            $client->authenticate();
            //or
            //$jgoogleapi->getClient()->authenticate();
            //or
            //Yii::app()->JGoogleAPI->getClient()->authenticate();
 
            Yii::app()->session['auth_token']=$client->getAccessToken();
 
        } else {
            $client->setAccessToken(Yii::app()->session['auth_token']);
            //List files from Google Drive
            $files = $jgoogleapi->getService('Drive')->files->listFiles();
            //Check the api documentation to see other ways to interact with api
 
            // We're not done yet. Remember to update the cached access token.
            // Remember to replace $_SESSION with a real database or memcached.
            Yii::app()->session['auth_token'] = $client->getAccessToken();
        }
    }catch(Exception $exc) {
        //Becarefull because the Exception you catch may not be from invalid token
        Yii::app()->session['auth_token']=null;
        throw $exc;
    }