1 files changed, 56 insertions, 0 deletions
diff --git a/core/lib/Drupal/Core/PageCache/ChainResponsePolicy.php b/core/lib/Drupal/Core/PageCache/ChainResponsePolicy.php
new file mode 100644
index 0000000..20d5e39
--- /dev/null
+++ b/core/lib/Drupal/Core/PageCache/ChainResponsePolicy.php
@@ -0,0 +1,56 @@
+<?php
+/**
+ * @file
+ * Contains \Drupal\Core\PageCache\ChainResponsePolicy.
+ */
+
+namespace Drupal\Core\PageCache;
+
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+
+/**
+ * Implements a compound response policy.
+ *
+ * When evaluating the compound policy, all of the contained rules are applied
+ * to the response. 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>Otherwise returns NULL</li>
+ * </ol>
+ */
+class ChainResponsePolicy implements ChainResponsePolicyInterface {
+
+  /**
+   * A list of policy rules to apply when this policy is checked.
+   *
+   * @var \Drupal\Core\PageCache\ResponsePolicyInterface[]
+   */
+  protected $rules = [];
+
+  /**
+   * {@inheritdoc}
+   */
+  public function check(Response $response, Request $request) {
+    foreach ($this->rules as $rule) {
+      $result = $rule->check($response, $request);
+      if ($result === static::DENY) {
+        return $result;
+      }
+      elseif (isset($result)) {
+        throw new \UnexpectedValueException('Return value of ResponsePolicyInterface::check() must be one of ResponsePolicyInterface::DENY or NULL');
+      }
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function addPolicy(ResponsePolicyInterface $policy) {
+    $this->rules[] = $policy;
+    return $this;
+  }
+
+}