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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;
- }
- }
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