yii, easy and simple user role management using yii's AuthManager

Step 1 : 

Create table :

CREATE TABLE User( 
`id` INT(11) NOT NULL AUTO_INCREMENT,
`username` VARCHAR(45),
`password` VARCHAR(254),
`title` VARCHAR(45),
PRIMARY KEY(`id`))
ENGINE = MyISAM;

Step 2 :

Add following code in config/main.php

'authManager'=>array(
            'class'=>'CDbAuthManager',
            'defaultRoles'=>array('authenticated', 'guest'),
        ),

 Below this code 

'db'=>array(
   'connectionString' => 'mysql:host=localhost;dbname=comocomo',
   'emulatePrepare' => true,
   'username' => 'root',
   'password' => 'abc123',
   'charset' => 'utf8',
  ),

Step 3: 

Create model and crud for user table useing GII or Shell

Step 4: 

You can now go back to the authentication guide and alter your UserIdentity to access the User table and check access like so:

class UserIdentity extends CUserIdentity
{
    private $_id;
    public function authenticate()
    {
        $record=User::model()->findByAttributes(array('username'=>$this->username));
        if($record===null)
            $this->errorCode=self::ERROR_USERNAME_INVALID;
        else if($record->password!==md5($this->password))
            $this->errorCode=self::ERROR_PASSWORD_INVALID;
        else
        {
            $this->_id=$record->id;
            $this->setState('title', $record->title);
            $this->errorCode=self::ERROR_NONE;
        }
        return !$this->errorCode;
    }
 
    public function getId()
    {
        return $this->_id;
    }
}

NOTE the override for getId -- this is VERY important for the authentication systems later.

Step 5 :

Now it's time to add more tables to the database for Authentication rule storage. 

In your main yii directory is a file called framework/web/auth/schema.sql . 

Run this file through your mysql command prompt (or editor of choice) and you will have three new tables set up for Authentication Management.

 They are: AuthAssignment, AuthItem, AuthItemChild

Step 6: 

Run following code once in by placing it an any executabelf ile of your yii web app:

$auth=Yii::app()->authManager;

$bizRule='return !Yii::app()->user->isGuest;';
$auth->createRole('authenticated', 'authenticated user', $bizRule);
 
$bizRule='return Yii::app()->user->isGuest;';
$auth->createRole('guest', 'guest user', $bizRule);

$role = $auth->createRole('admin', 'administrator');
$auth->assign('admin',1); // adding admin to first user created 

$auth->save();

Step 7 : 

In your Controllers (we'll use the User as an example since we created that one above) you can now change the /protected/controllers/UserController.php accessRules function to allow only your admin to delete users as such:
public function accessRules(){
    return array(
        array('allow', // allow anyone to register
              'actions'=>array('create'), 
              'users'=>array('*'), // all users
        ),
        array('allow', // allow authenticated users to update/view
              'actions'=>array('update','view'), 
              'roles'=>array('authenticated')
        ),
        array('allow', // allow admins only to delete
              'actions'=>array('delete'), 
              'roles'=>array('admin'),
        ),
        array('deny', // deny anything else
              'users'=>array('*'),
        ),
    );
}

Step 8:

We need a task which allows users to update their own information. Back to the shell:

$auth=Yii::app()->authManager;
$bizRule = 'return Yii::app()->user->id==$params["User"]->id;';
$auth->createTask('updateSelf', 'update own information', $bizRule);

$role = $auth->getAuthItem('authenticated'); // pull up the authenticated role
$role->addChild('updateSelf'); // assign updateSelf tasks to authenticated users

Step 9:

Finally Open the UserController.php file again and move to the actionUpdate() function. We'll need to modify it as such: 

public function actionUpdate()
{
    $model = $this->loadModel();
    
    // set the parameters for the bizRule
    $params = array('User'=>$model);
    // now check the bizrule for this user
    if (!Yii::app()->user->checkAccess('updateSelf', $params) &&
        !Yii::app()->user->checkAccess('admin'))
    {
        throw new CHttpException(403, 'You are not authorized to perform this action');
    }
    ...