# Extensions

API Platform Core provides a system to extend queries on items and collections.

Extensions are specific to Doctrine, and therefore, the Doctrine ORM support must be enabled to use this feature. If you use custom providers it’s up to you to implement your own extension system or not.

# Custom Extension

Custom extensions must implement the ApiPlatform\Core\Bridge\Doctrine\Orm\Extension\QueryCollectionExtensionInterface and / or the ApiPlatform\Core\Bridge\Doctrine\Orm\Extension\QueryItemExtensionInterface interfaces, to be run when querying for a collection of items and when querying for an item respectively.

If you use custom data providers, they must support extensions and be aware of active extensions to work properly.

# Example

In the following example, we will see how to always get the offers owned by the current user. We will set up an exception, whenever the user has the ROLE_ADMIN.

Given these two entities:

<?php
// src/AppBundle/Entity/User.php

namespace AppBundle\Entity;

use ApiPlatform\Core\Annotation\ApiResource;

/**
 * @ApiResource
 */
class User
{
    // ...
}

<?php
// src/AppBundle/Entity/Offer.php

namespace AppBundle\Entity;

use ApiPlatform\Core\Annotation\ApiResource;

/**
 * @ApiResource
 */
class Offer
{
   /**
     * @var User
     * @ORM\ManyToOne(targetEntity="User")
     */
    private $user;

    //...
}

<?php
// src/AppBundle/Doctrine/ORM/Extension/CurrentUserExtension.php

namespace AppBundle\Doctrine\ORM\Extension;

use ApiPlatform\Core\Bridge\Doctrine\Orm\Extension\QueryCollectionExtensionInterface;
use ApiPlatform\Core\Bridge\Doctrine\Orm\Extension\QueryItemExtensionInterface;
use ApiPlatform\Core\Bridge\Doctrine\Orm\Util\QueryNameGeneratorInterface;
use AppBundle\Entity\Offer;
use AppBundle\Entity\User;
use Doctrine\ORM\QueryBuilder;
use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
use Symfony\Component\Security\Core\Authorization\AuthorizationCheckerInterface;

final class CurrentUserExtension implements QueryCollectionExtensionInterface, QueryItemExtensionInterface
{
    private $tokenStorage;
    private $authorizationChecker;

    public function __construct(TokenStorageInterface $tokenStorage, AuthorizationCheckerInterface $checker)
    {
        $this->tokenStorage = $tokenStorage;
        $this->authorizationChecker = $checker;
    }

    /**
     * {@inheritdoc}
     */
    public function applyToCollection(QueryBuilder $queryBuilder, QueryNameGeneratorInterface $queryNameGenerator, string $resourceClass, string $operationName = null)
    {
        $this->addWhere($queryBuilder, $resourceClass);
    }

    /**
     * {@inheritdoc}
     */
    public function applyToItem(QueryBuilder $queryBuilder, QueryNameGeneratorInterface $queryNameGenerator, string $resourceClass, array $identifiers, string $operationName = null, array $context = [])
    {
        $this->addWhere($queryBuilder, $resourceClass);
    }

    /**
     *
     * @param QueryBuilder $queryBuilder
     * @param string       $resourceClass
     */
    private function addWhere(QueryBuilder $queryBuilder, string $resourceClass)
    {
        $user = $this->tokenStorage->getToken()->getUser();
        if ($user instanceof User && Offer::class === $resourceClass && !$this->authorizationChecker->isGranted('ROLE_ADMIN')) {
            $rootAlias = $queryBuilder->getRootAliases()[0];
            $queryBuilder->andWhere(sprintf('%s.user = :current_user', $rootAlias));
            $queryBuilder->setParameter('current_user', $user->getId());
        }
    }
}

Finally register the custom extension:

# app/config/services.yml
services:

    # ...

    'AppBundle\Doctrine\ORM\Extension\CurrentUserExtension':
        tags:
            - { name: api_platform.doctrine.orm.query_extension.collection, priority: 9 }
            - { name: api_platform.doctrine.orm.query_extension.item }

Thanks to the api_platform.doctrine.orm.query_extension.collection tag, API Platform will register this service as a collection extension. The api_platform.doctrine.orm.query_extension.item do the same thing for items.

Notice the priority level for the api_platform.doctrine.orm.query_extension.collection tag. When an extension implements the ApiPlatform\Core\Bridge\Doctrine\Orm\Extension\QueryResultCollectionExtensionInterface or the ApiPlatform\Core\Bridge\Doctrine\Orm\Extension\QueryResultItemExtensionInterface interface to return results by itself, any lower priority extension will not be executed. Because the pagination is enabled by default with a priority of 8, the priority of the app.doctrine.orm.query_extension.current_user service must be at least 9 to ensure its execution.

# Blocking Anonymous Users

This example adds a WHERE clause condition only when a fully authenticated user without ROLE_ADMIN tries to access to a resource. It means that anonymous users will be able to access to all data. To prevent this potential security issue, the API must ensure that the current user is authenticated.

To secure the access to endpoints, use the following access control rule:

# app/config/security.yml
security:
    # ...

    access_control:
        # ...

        - { path: ^/offers, roles: IS_AUTHENTICATED_FULLY }
        - { path: ^/users, roles: IS_AUTHENTICATED_FULLY }

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# Extensions

# Custom Extension

# Example

# Blocking Anonymous Users