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Pull Request — master (#11)
by Pavel
08:20
created

Adapters/Symfony/SymfonyNormalizerAdapter.php (3 issues)

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Code
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<?php
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namespace Bankiru\Api\JsonRpc\Adapters\Symfony;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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use Bankiru\Api\JsonRpc\NormalizerInterface;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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use Symfony\Component\Serializer\Normalizer\NormalizerInterface as SymfonyNormalizerInterface;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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final class SymfonyNormalizerAdapter implements NormalizerInterface

            


            
                                                                                                            
                            
            
                                    
            
            

                
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{

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    /** @var SymfonyNormalizerInterface */

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    private $normalizer;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    /**

            


            
                                                                                                            
                            
            
                                    
            
            

                
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     * SymfonyNormalizerAdapter constructor.

            


            
                                                                                                            
                            
            
                                    
            
            

                
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     *

            


            
                                                                                                            
                            
            
                                    
            
            

                
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     * @param SymfonyNormalizerInterface $normalizer

            


            
                                                                                                            
                            
            
                                    
            
            

                
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     */

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    public function __construct(SymfonyNormalizerInterface $normalizer)

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    {

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        $this->normalizer = $normalizer;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    }

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    /** {@inheritdoc} */

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    public function normalize($entity, array $context = [])

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    {

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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        if (null === $entity) {

            


            
                                                        
            
                                    
            
            

                
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            return null;

            


            
                                                        
            
                                    
            
            

                
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        }

            


            
                                                        
            
                                    
            
            

                
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        return $this->normalizer->normalize($entity, ['groups' => $context]);

            


                            

                    
                        
                    
                    
                    
                    
                                                                                                                                                                                                            
                        

                            
                            
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It seems like $entity defined by parameter $entity on line 24 can also be of type array; however, Symfony\Component\Serial...rInterface::normalize() does only seem to accept object, maybe add an additional type check?
                                                                                                                                                                                                                                                                                                                                                                    

                    
                                            

                            

                            

                                
                                    
                                
                            


                            
This check looks at variables that have been passed in as parameters and are passed out again
to other methods.


If the outgoing method call has stricter type requirements than the method itself, an issue is raised.


An additional type check may prevent trouble.


                        

                                                    

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array('groups' => $context) is of type array<string,array,{"groups":"array"}>, but the function expects a string|null.
                                                                                                                                                                                                        

                    
                                            

                            

                            

                                
                                    
                                
                            


                            
It seems like the type of the argument is not accepted by the function/method
which you are calling.


In some cases, in particular if PHP’s automatic type-juggling kicks in this
might be fine. In other cases, however this might be a bug.


We suggest to add an explicit type cast like in the following example:


function acceptsInteger($int) { }

$x = '123'; // string "123"

// Instead of
acceptsInteger($x);

// we recommend to use
acceptsInteger((integer) $x);





                        

                                                    

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The return type of return $this->normalizer...'groups' => $context)); (array|integer|double|string|boolean) is incompatible with the return type declared by the interface Bankiru\Api\JsonRpc\NormalizerInterface::normalize of type array|null.
                                                                                                                                                                                                                                                                                                                

                    
                                            

                            

                            

                                
                                    
                                
                            


                            
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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