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view core/lib/Drupal/Core/PageCache/ChainRequestPolicy.php @ 19:fa3358dc1485 tip
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author | Chris Cannam |
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date | Wed, 28 Aug 2019 13:14:47 +0100 |
parents | 4c8ae668cc8c |
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<?php namespace Drupal\Core\PageCache; use Symfony\Component\HttpFoundation\Request; /** * Implements a compound request policy. * * When evaluating the compound policy, all of the contained rules are applied * to the request. The overall result is computed according to the following * rules: * * <ol> * <li>Returns static::DENY if any of the rules evaluated to static::DENY</li> * <li>Returns static::ALLOW if at least one of the rules evaluated to * static::ALLOW and none to static::DENY</li> * <li>Otherwise returns NULL</li> * </ol> */ class ChainRequestPolicy implements ChainRequestPolicyInterface { /** * A list of policy rules to apply when this policy is evaluated. * * @var \Drupal\Core\PageCache\RequestPolicyInterface[] */ protected $rules = []; /** * {@inheritdoc} */ public function check(Request $request) { $final_result = NULL; foreach ($this->rules as $rule) { $result = $rule->check($request); if ($result === static::DENY) { return $result; } elseif ($result === static::ALLOW) { $final_result = $result; } elseif (isset($result)) { throw new \UnexpectedValueException('Return value of RequestPolicyInterface::check() must be one of RequestPolicyInterface::ALLOW, RequestPolicyInterface::DENY or NULL'); } } return $final_result; } /** * {@inheritdoc} */ public function addPolicy(RequestPolicyInterface $policy) { $this->rules[] = $policy; return $this; } }