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by greg
03:12
created

SwitchLocaleController::__construct()   A

Complexity

Conditions 1
Paths 1

Size

Total Lines 4
Code Lines 2

Duplication

Lines 0
Ratio 0 %

Importance

Changes 1
Bugs 0 Features 0
Metric Value
c 1
b 0
f 0
dl 0
loc 4
rs 10
cc 1
eloc 2
nc 1
nop 1
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<?php
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namespace PlaygroundCore\Controller\Frontend;
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use Zend\Mvc\Controller\AbstractActionController;
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use Zend\ServiceManager\ServiceLocatorInterface;
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class SwitchLocaleController extends AbstractActionController
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{
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    /**
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     *
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     * @var ServiceManager
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     */
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    protected $serviceLocator;
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    public function __construct(ServiceLocatorInterface $locator)
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    {
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        $this->serviceLocator = $locator;
0 ignored issues
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Documentation Bug introduced by
It seems like $locator of type object<Zend\ServiceManag...erviceLocatorInterface> is incompatible with the declared type object<PlaygroundCore\Co...rontend\ServiceManager> of property $serviceLocator.

Our type inference engine has found an assignment to a property that is incompatible with the declared type of that property.

Either this assignment is in error or the assigned type should be added to the documentation/type hint for that property..

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    }
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    public function getServiceLocator()
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    {
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        return $this->serviceLocator;
0 ignored issues
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Bug Best Practice introduced by
The return type of return $this->serviceLocator; (PlaygroundCore\Controller\Frontend\ServiceManager) is incompatible with the return type of the parent method Zend\Mvc\Controller\Abst...ller::getServiceLocator of type Zend\ServiceManager\ServiceLocatorInterface.

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:

class Author {
    private $name;

    public function __construct($name) {
        $this->name = $name;
    }

    public function getName() {
        return $this->name;
    }
}

abstract class Post {
    public function getAuthor() {
        return 'Johannes';
    }
}

class BlogPost extends Post {
    public function getAuthor() {
        return new Author('Johannes');
    }
}

class ForumPost extends Post { /* ... */ }

function my_function(Post $post) {
    echo strtoupper($post->getAuthor());
}

Our function my_function expects a Post object, and outputs the author of the post. The base class Post returns a simple string and outputting a simple string will work just fine. However, the child class BlogPost which is a sub-type of Post instead decided to return an object, and is therefore violating the SOLID principles. If a BlogPost were passed to my_function, PHP would not complain, but ultimately fail when executing the strtoupper call in its body.

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    }
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    /**
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    * switchAction : permet de switcher de langue en fonction d'un context (back/front)
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    * locale : locale pour switch
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    * context : (back/front)
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    * referer : retour à la page
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    *
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    * @return Redirect $redirect redirect to referer
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    */
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    public function switchAction()
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    {
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        $lang = $this->getEvent()->getRouteMatch()->getParam('lang');
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        $context = $this->getEvent()->getRouteMatch()->getParam('area');
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        $redirect = (!empty($this->getEvent()->getRouteMatch()->getParam('redirect')))? urldecode($this->getEvent()->getRouteMatch()->getParam('redirect')) : '/'.$lang;
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        $cookie = new \Zend\Http\Header\SetCookie('pg_locale_'.$context, $lang, time() + 60*60*24*365, '/');
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        $this->getResponse()->getHeaders()->addHeader($cookie);
0 ignored issues
show
Bug introduced by
It seems like you code against a concrete implementation and not the interface Zend\Stdlib\ResponseInterface as the method getHeaders() does only exist in the following implementations of said interface: Zend\Http\PhpEnvironment\Response, Zend\Http\Response, Zend\Http\Response\Stream.

Let’s take a look at an example:

interface User
{
    /** @return string */
    public function getPassword();
}

class MyUser implements User
{
    public function getPassword()
    {
        // return something
    }

    public function getDisplayName()
    {
        // return some name.
    }
}

class AuthSystem
{
    public function authenticate(User $user)
    {
        $this->logger->info(sprintf('Authenticating %s.', $user->getDisplayName()));
        // do something.
    }
}

In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different implementation of User which does not have a getDisplayName() method, the code will break.

Available Fixes

  1. Change the type-hint for the parameter:

    class AuthSystem
    {
        public function authenticate(MyUser $user) { /* ... */ }
    }
    
  2. Add an additional type-check:

    class AuthSystem
    {
        public function authenticate(User $user)
        {
            if ($user instanceof MyUser) {
                $this->logger->info(/** ... */);
            }
    
            // or alternatively
            if ( ! $user instanceof MyUser) {
                throw new \LogicException(
                    '$user must be an instance of MyUser, '
                   .'other instances are not supported.'
                );
            }
    
        }
    }
    
Note: PHP Analyzer uses reverse abstract interpretation to narrow down the types inside the if block in such a case.
  1. Add the method to the interface:

    interface User
    {
        /** @return string */
        public function getPassword();
    
        /** @return string */
        public function getDisplayName();
    }
    
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        return $this->redirect()->toUrl($redirect);
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    }
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}
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