Version 1

[yaffs-website] / web / core / lib / Drupal / Core / Cache / Context / HeadersCacheContext.php

diff --git a/web/core/lib/Drupal/Core/Cache/Context/HeadersCacheContext.php b/web/core/lib/Drupal/Core/Cache/Context/HeadersCacheContext.php
new file mode 100644 (file)
index 0000000..0a9ac0a
--- /dev/null
+++ b/web/core/lib/Drupal/Core/Cache/Context/HeadersCacheContext.php
@@ -0,0 +1,42 @@
+<?php
+
+namespace Drupal\Core\Cache\Context;
+
+use Drupal\Core\Cache\CacheableMetadata;
+
+/**
+ * Defines the HeadersCacheContext service, for "per header" caching.
+ *
+ * Cache context ID: 'headers' (to vary by all headers).
+ * Calculated cache context ID: 'headers:%name', e.g. 'headers:X-Something' (to
+ * vary by the 'X-Something' header).
+ */
+class HeadersCacheContext extends RequestStackCacheContextBase implements CalculatedCacheContextInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getLabel() {
+    return t('HTTP headers');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getContext($header = NULL) {
+    if ($header === NULL) {
+      return $this->requestStack->getCurrentRequest()->headers->all();
+    }
+    else {
+      return $this->requestStack->getCurrentRequest()->headers->get($header);
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCacheableMetadata($header = NULL) {
+    return new CacheableMetadata();
+  }
+
+}