FunctionInjector.php 2.0 KB

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  1. <?php
  2. declare(strict_types=1);
  3. /**
  4. * @copyright 2020 Christoph Wurst <christoph@winzerhof-wurst.at>
  5. *
  6. * @author Christoph Wurst <christoph@winzerhof-wurst.at>
  7. *
  8. * @license GNU AGPL version 3 or any later version
  9. *
  10. * This program is free software: you can redistribute it and/or modify
  11. * it under the terms of the GNU Affero General Public License as
  12. * published by the Free Software Foundation, either version 3 of the
  13. * License, or (at your option) any later version.
  14. *
  15. * This program is distributed in the hope that it will be useful,
  16. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18. * GNU Affero General Public License for more details.
  19. *
  20. * You should have received a copy of the GNU Affero General Public License
  21. * along with this program. If not, see <http://www.gnu.org/licenses/>.
  22. *
  23. */
  24. namespace OC\AppFramework\Bootstrap;
  25. use Closure;
  26. use OCP\AppFramework\QueryException;
  27. use Psr\Container\ContainerInterface;
  28. use ReflectionFunction;
  29. use ReflectionParameter;
  30. use function array_map;
  31. class FunctionInjector {
  32. /** @var ContainerInterface */
  33. private $container;
  34. public function __construct(ContainerInterface $container) {
  35. $this->container = $container;
  36. }
  37. public function injectFn(callable $fn) {
  38. $reflected = new ReflectionFunction(Closure::fromCallable($fn));
  39. return $fn(...array_map(function (ReflectionParameter $param) {
  40. // First we try by type (more likely these days)
  41. if (($type = $param->getType()) !== null) {
  42. try {
  43. return $this->container->get($type->getName());
  44. } catch (QueryException $ex) {
  45. // Ignore and try name as well
  46. }
  47. }
  48. // Second we try by name (mostly for primitives)
  49. try {
  50. return $this->container->get($param->getName());
  51. } catch (QueryException $ex) {
  52. // As a last resort we pass `null` if allowed
  53. if ($type !== null && $type->allowsNull()) {
  54. return null;
  55. }
  56. // Nothing worked, time to bail out
  57. throw $ex;
  58. }
  59. }, $reflected->getParameters()));
  60. }
  61. }