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<?php
declare(strict_types=1);
/**
* @copyright 2020 Christoph Wurst <christoph@winzerhof-wurst.at>
*
* @author Christoph Wurst <christoph@winzerhof-wurst.at>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
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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