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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * airlock authkey based consultant user provider  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Graviton\SecurityBundle\Authentication\Provider;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use \Graviton\RestBundle\Model\ModelInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Security\Core\Exception\UnsupportedUserException;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Security\Core\User\UserInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Security\Core\User\UserProviderInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Class AirlockAuthenticationKeyConsultantProvider  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author   List of contributors <https://github.com/libgraviton/graviton/graphs/contributors>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @license  http://opensource.org/licenses/gpl-license.php GNU Public License  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @link     http://swisscom.ch  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class AuthenticationProvider implements UserProviderInterface  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var ModelInterface  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $documentModel;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var String  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private $queryField;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param ModelInterface $model The documentModel  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $queryField  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function __construct(ModelInterface $model, $queryField)  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->documentModel = $model;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->queryField = $queryField;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Loads the user for the given username.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * This method must throw UsernameNotFoundException if the user is not  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * found.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $username the consultants username  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return \Symfony\Component\Security\Core\User\UserInterface  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @see \Symfony\Component\Security\Core\Exception\UsernameNotFoundException  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @throws \Symfony\Component\Security\Core\Exception\UsernameNotFoundException if the user is not found  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function loadUserByUsername($username)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ( !$this->queryField ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return false;  | 
            
                            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $user = $this->documentModel->getRepository()->findOneBy(array($this->queryField => $username));  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $user ? $user : false;  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Refreshes the user for the account interface.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * It is up to the implementation to decide if the user data should be  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * totally reloaded (e.g. from the database), or if the UserInterface  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * object can just be merged into some internal array of users / identity  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * map.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param \Symfony\Component\Security\Core\User\UserInterface $user user to refresh  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return \Symfony\Component\Security\Core\User\UserInterface  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @throws \Symfony\Component\Security\Core\Exception\UnsupportedUserException if the account is not supported  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function refreshUser(UserInterface $user)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        // this is used for storing authentication in the session  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        // but in this example, the token is sent in each request,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        // so authentication can be stateless. Throwing this exception  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        // is proper to make things stateless  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        throw new UnsupportedUserException();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Whether this provider supports the given user class.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $class class to check for support  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return bool  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function supportsClass($class)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $class instanceof \Symfony\Component\Security\Core\User\UserInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design.
Let’s take a look at an example:
Our function
my_functionexpects aPostobject, and outputs the author of the post. The base classPostreturns a simple string and outputting a simple string will work just fine. However, the child classBlogPostwhich is a sub-type ofPostinstead decided to return anobject, and is therefore violating the SOLID principles. If aBlogPostwere passed tomy_function, PHP would not complain, but ultimately fail when executing thestrtouppercall in its body.