diff core/lib/Drupal/Core/PageCache/ChainRequestPolicy.php @ 0:4c8ae668cc8c

Initial import (non-working)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/lib/Drupal/Core/PageCache/ChainRequestPolicy.php	Wed Nov 29 16:09:58 2017 +0000
@@ -0,0 +1,60 @@
+<?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;
+  }
+
+}