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✏️ Editing: ExtendedContainer.php

<?php
/**
 * ExtendedContainer class file.
 */

namespace Automattic\Kkart\Internal\DependencyManagement;

use Automattic\Kkart\Utilities\StringUtil;
use Automattic\Kkart\Vendor\League\Container\Container as BaseContainer;
use Automattic\Kkart\Vendor\League\Container\Definition\DefinitionInterface;

/**
 * This class extends the original League's Container object by adding some functionality
 * that we need for Kkart.
 */
class ExtendedContainer extends BaseContainer {

/**
	 * The root namespace of all Kkart classes in the `src` directory.
	 *
	 * @var string
	 */
	private $kkart_namespace = 'Automattic\\Kkart\\';

/**
	 * Whitelist of classes that we can register using the container
	 * despite not belonging to the Kkart root namespace.
	 *
	 * In general we allow only the registration of classes in the
	 * Kkart root namespace to prevent registering 3rd party code
	 * (which doesn't really belong to this container) or old classes
	 * (which may be eventually deprecated, also the LegacyProxy
	 * should be used for those).
	 *
	 * @var string[]
	 */
	private $registration_whitelist = array(
		\Psr\Container\ContainerInterface::class,
	);

/**
	 * Register a class in the container.
	 *
	 * @param string    $class_name Class name.
	 * @param mixed     $concrete How to resolve the class with `get`: a factory callback, a concrete instance, another class name, or null to just create an instance of the class.
	 * @param bool|null $shared Whether the resolution should be performed only once and cached.
	 *
	 * @return DefinitionInterface The generated definition for the container.
	 * @throws ContainerException Invalid parameters.
	 */
	public function add( string $class_name, $concrete = null, bool $shared = null ) : DefinitionInterface {
		if ( ! $this->is_class_allowed( $class_name ) ) {
			throw new ContainerException( "You cannot add '$class_name', only classes in the {$this->kkart_namespace} namespace are allowed." );
		}

$concrete_class = $this->get_class_from_concrete( $concrete );
		if ( isset( $concrete_class ) && ! $this->is_class_allowed( $concrete_class ) ) {
			throw new ContainerException( "You cannot add concrete '$concrete_class', only classes in the {$this->kkart_namespace} namespace are allowed." );
		}

// We want to use a definition class that does not support constructor injection to avoid accidental usage.
		if ( ! $concrete instanceof DefinitionInterface ) {
			$concrete = new Definition( $class_name, $concrete );
		}

return parent::add( $class_name, $concrete, $shared );
	}

/**
	 * Replace an existing registration with a different concrete.
	 *
	 * @param string $class_name The class name whose definition will be replaced.
	 * @param mixed  $concrete The new concrete (same as "add").
	 *
	 * @return DefinitionInterface The modified definition.
	 * @throws ContainerException Invalid parameters.
	 */
	public function replace( string $class_name, $concrete ) : DefinitionInterface {
		if ( ! $this->has( $class_name ) ) {
			throw new ContainerException( "The container doesn't have '$class_name' registered, please use 'add' instead of 'replace'." );
		}

$concrete_class = $this->get_class_from_concrete( $concrete );
		if ( isset( $concrete_class ) && ! $this->is_class_allowed( $concrete_class ) ) {
			throw new ContainerException( "You cannot use concrete '$concrete_class', only classes in the {$this->kkart_namespace} namespace are allowed." );
		}

return $this->extend( $class_name )->setConcrete( $concrete );
	}

/**
	 * Reset all the cached resolutions, so any further "get" for shared definitions will generate the instance again.
	 */
	public function reset_all_resolved() {
		foreach ( $this->definitions->getIterator() as $definition ) {
			// setConcrete causes the cached resolved value to be forgotten.
			$concrete = $definition->getConcrete();
			$definition->setConcrete( $concrete );
		}
	}

/**
	 * Get an instance of a registered class.
	 *
	 * @param string $id The class name.
	 * @param bool   $new True to generate a new instance even if the class was registered as shared.
	 *
	 * @return object An instance of the requested class.
	 * @throws ContainerException Attempt to get an instance of a non-namespaced class.
	 */
	public function get( $id, bool $new = false ) {
		if ( false === strpos( $id, '\\' ) ) {
			throw new ContainerException( "Attempt to get an instance of the non-namespaced class '$id' from the container, did you forget to add a namespace import?" );
		}

return parent::get( $id, $new );
	}

/**
	 * Gets the class from the concrete regardless of type.
	 *
	 * @param mixed $concrete The concrete that we want the class from..
	 *
	 * @return string|null The class from the concrete if one is available, null otherwise.
	 */
	protected function get_class_from_concrete( $concrete ) {
		if ( is_object( $concrete ) && ! is_callable( $concrete ) ) {
			if ( $concrete instanceof DefinitionInterface ) {
				return $this->get_class_from_concrete( $concrete->getConcrete() );
			}

return get_class( $concrete );
		}

if ( is_string( $concrete ) && class_exists( $concrete ) ) {
			return $concrete;
		}

return null;
	}

/**
	 * Checks to see whether or not a class is allowed to be registered.
	 *
	 * @param string $class_name The class to check.
	 *
	 * @return bool True if the class is allowed to be registered, false otherwise.
	 */
	protected function is_class_allowed( string $class_name ): bool {
		return StringUtil::starts_with( $class_name, $this->kkart_namespace, false ) || in_array( $class_name, $this->registration_whitelist, true );
	}
}

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