diff core/modules/node/src/Cache/NodeAccessGrantsCacheContext.php @ 0:4c8ae668cc8c

Initial import (non-working)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/modules/node/src/Cache/NodeAccessGrantsCacheContext.php	Wed Nov 29 16:09:58 2017 +0000
@@ -0,0 +1,101 @@
+<?php
+
+namespace Drupal\node\Cache;
+
+use Drupal\Core\Cache\CacheableMetadata;
+use Drupal\Core\Cache\Context\CalculatedCacheContextInterface;
+use Drupal\Core\Cache\Context\UserCacheContextBase;
+
+/**
+ * Defines the node access view cache context service.
+ *
+ * Cache context ID: 'user.node_grants' (to vary by all operations' grants).
+ * Calculated cache context ID: 'user.node_grants:%operation', e.g.
+ * 'user.node_grants:view' (to vary by the view operation's grants).
+ *
+ * This allows for node access grants-sensitive caching when listing nodes.
+ *
+ * @see node_query_node_access_alter()
+ * @ingroup node_access
+ */
+class NodeAccessGrantsCacheContext extends UserCacheContextBase implements CalculatedCacheContextInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getLabel() {
+    return t("Content access view grants");
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getContext($operation = NULL) {
+    // If the current user either can bypass node access then we don't need to
+    // determine the exact node grants for the current user.
+    if ($this->user->hasPermission('bypass node access')) {
+      return 'all';
+    }
+
+    // When no specific operation is specified, check the grants for all three
+    // possible operations.
+    if ($operation === NULL) {
+      $result = [];
+      foreach (['view', 'update', 'delete'] as $op) {
+        $result[] = $this->checkNodeGrants($op);
+      }
+      return implode('-', $result);
+    }
+    else {
+      return $this->checkNodeGrants($operation);
+    }
+  }
+
+  /**
+   * Checks the node grants for the given operation.
+   *
+   * @param string $operation
+   *   The operation to check the node grants for.
+   *
+   * @return string
+   *   The string representation of the cache context.
+   */
+  protected function checkNodeGrants($operation) {
+    // When checking the grants for the 'view' operation and the current user
+    // has a global view grant (i.e. a view grant for node ID 0) — note that
+    // this is automatically the case if no node access modules exist (no
+    // hook_node_grants() implementations) then we don't need to determine the
+    // exact node view grants for the current user.
+    if ($operation === 'view' && node_access_view_all_nodes($this->user)) {
+      return 'view.all';
+    }
+
+    $grants = node_access_grants($operation, $this->user);
+    $grants_context_parts = [];
+    foreach ($grants as $realm => $gids) {
+      $grants_context_parts[] = $realm . ':' . implode(',', $gids);
+    }
+    return $operation . '.' . implode(';', $grants_context_parts);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCacheableMetadata($operation = NULL) {
+    $cacheable_metadata = new CacheableMetadata();
+
+    if (!\Drupal::moduleHandler()->getImplementations('node_grants')) {
+      return $cacheable_metadata;
+    }
+
+    // The node grants may change if the user is updated. (The max-age is set to
+    // zero below, but sites may override this cache context, and change it to a
+    // non-zero value. In such cases, this cache tag is needed for correctness.)
+    $cacheable_metadata->setCacheTags(['user:' . $this->user->id()]);
+
+    // If the site is using node grants, this cache context can not be
+    // optimized.
+    return $cacheable_metadata->setCacheMaxAge(0);
+  }
+
+}