Adds an AccessPolicy that is queried to determine what a connection can do

mojo/services/view_manager/access_policy.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MOJO_SERVICES_VIEW_MANAGER_ACCESS_POLICY_H_
+#define MOJO_SERVICES_VIEW_MANAGER_ACCESS_POLICY_H_
+
+#include "mojo/services/public/interfaces/view_manager/view_manager_constants.mojom.h"
+#include "mojo/services/view_manager/ids.h"
+
+namespace mojo {
+namespace service {
+
+class Node;
+class View;
+
+// AccessPolicy is used by ViewManagerServiceImpl to determine what a connection
+// is allowed to do.
+class AccessPolicy {
+ public:
+  virtual ~AccessPolicy() {}
+
+  // Unless otherwise mentioned all arguments have been validated. That is the
+  // |node| and/or |view| arguments are non-null unless otherwise stated (eg
+  // CanSetView() is allowed to take a NULL view).
+  virtual bool CanRemoveNodeFromParent(const Node* node) const = 0;
+  virtual bool CanAddNode(const Node* parent, const Node* child) const = 0;
+  virtual bool CanReorderNode(const Node* node,
+                              const Node* relative_node,
+                              OrderDirection direction) const = 0;
+  virtual bool CanDeleteNode(const Node* node) const = 0;
+  virtual bool CanDeleteView(const View* view) const = 0;
+  // Note |view| may be NULL here.
+  virtual bool CanSetView(const Node* node, const View* view) const = 0;
+  virtual bool CanSetFocus(const Node* node) const = 0;
+  virtual bool CanGetNodeTree(const Node* node) const = 0;
+  // Used when building a node tree (GetNodeTree()) to decide if we should
+  // descend into |node|.
+  virtual bool CanDescendIntoNodeForNodeTree(const Node* node) const = 0;
+  virtual bool CanEmbed(const Node* node) const = 0;
+  virtual bool CanChangeNodeVisibility(const Node* node) const = 0;
+  virtual bool CanSetViewContents(const View* view) const = 0;
+  virtual bool CanSetNodeBounds(const Node* node) const = 0;
+
+  // Returns whether the connection should notify on a hierarchy change.
+  // |new_parent| and |old_parent| are initially set to the new and old parents
+  // but may be altered so that the client only sees a certain set of nodes.
+  virtual bool ShouldNotifyOnHierarchyChange(
+      const Node* node,
+      const Node** new_parent,
+      const Node** old_parent) const = 0;
+
+  // Returns the Id of the view to send to the client. |view| is or was
+  // associated with |node|.
+  virtual Id GetViewIdToSend(const Node* node, const View* view) const = 0;
+
+  virtual bool ShouldSendViewDeleted(const ViewId& view_id) const = 0;
+};
+
+}  // namespace service
+}  // namespace mojo
+
+#endif  // MOJO_SERVICES_VIEW_MANAGER_ACCESS_POLICY_H_