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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2020 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
namespace OC\AppFramework\Bootstrap;
use Closure;
use OCP\AppFramework\QueryException;
use Psr\Container\ContainerInterface;
use ReflectionFunction;
use ReflectionParameter;
use function array_map;
class FunctionInjector {
/** @var ContainerInterface */
private $container;
public function __construct(ContainerInterface $container) {
$this->container = $container;
}
public function injectFn(callable $fn) {
$reflected = new ReflectionFunction(Closure::fromCallable($fn));
return $fn(...array_map(function (ReflectionParameter $param) {
// First we try by type (more likely these days)
if (($type = $param->getType()) !== null) {
try {
return $this->container->get($type->getName());
} catch (QueryException $ex) {
// Ignore and try name as well
}
}
// Second we try by name (mostly for primitives)
try {
return $this->container->get($param->getName());
} catch (QueryException $ex) {
// As a last resort we pass `null` if allowed
if ($type !== null && $type->allowsNull()) {
return null;
}
// Nothing worked, time to bail out
throw $ex;
}
}, $reflected->getParameters()));
}
}
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