Support custom message filtering on Mojo binding objects

mojo/public/cpp/bindings/lib/binding_state.h

 // Copyright 2015 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_PUBLIC_CPP_BINDINGS_LIB_BINDING_STATE_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_LIB_BINDING_STATE_H_
 
 #include <memory>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/single_thread_task_runner.h"
 #include "mojo/public/cpp/bindings/associated_group.h"
+#include "mojo/public/cpp/bindings/filter_chain.h"
 #include "mojo/public/cpp/bindings/interface_endpoint_client.h"
 #include "mojo/public/cpp/bindings/interface_id.h"
 #include "mojo/public/cpp/bindings/interface_ptr.h"
 #include "mojo/public/cpp/bindings/interface_ptr_info.h"
 #include "mojo/public/cpp/bindings/interface_request.h"
-#include "mojo/public/cpp/bindings/lib/filter_chain.h"
 #include "mojo/public/cpp/bindings/lib/multiplex_router.h"
 #include "mojo/public/cpp/bindings/lib/router.h"
 #include "mojo/public/cpp/bindings/message_header_validator.h"
 #include "mojo/public/cpp/bindings/scoped_interface_endpoint_handle.h"
 #include "mojo/public/cpp/system/core.h"
 
 namespace mojo {
 namespace internal {
 
 // Base class used for templated binding primitives which bind a pipe
 // exclusively to a single interface.
 class SimpleBindingState {
  public:
   SimpleBindingState();
   ~SimpleBindingState();
 
+  void AddFilter(std::unique_ptr<MessageReceiver> filter);
+
   bool HasAssociatedInterfaces() const { return false; }
 
   void PauseIncomingMethodCallProcessing();
   void ResumeIncomingMethodCallProcessing();
 
   bool WaitForIncomingMethodCall(
       MojoDeadline deadline = MOJO_DEADLINE_INDEFINITE);
 
   void Close();
 
@@ skipping 10 matching lines @@
   }
 
   AssociatedGroup* associated_group() { return nullptr; }
 
   void EnableTestingMode();
 
  protected:
   void BindInternal(ScopedMessagePipeHandle handle,
                     scoped_refptr<base::SingleThreadTaskRunner> runner,
                     const char* interface_name,
-                    MessageFilter* request_validator,
+                    std::unique_ptr<MessageReceiver> request_validator,
                     bool has_sync_methods,
                     MessageReceiverWithResponderStatus* stub);
 
   void DestroyRouter();
 
   internal::Router* router_ = nullptr;
   base::Closure connection_error_handler_;
 
  private:
   void RunConnectionErrorHandler();
@@ skipping 11 matching lines @@
  public:
   explicit BindingState(Interface* impl) : impl_(impl) {
     stub_.set_sink(impl_);
   }
 
   ~BindingState() { Close(); }
 
   void Bind(ScopedMessagePipeHandle handle,
             scoped_refptr<base::SingleThreadTaskRunner> runner) {
     DCHECK(!router_);
-    SimpleBindingState::BindInternal(std::move(handle), runner,
-                                     Interface::Name_, new
-                                     typename Interface::RequestValidator_(),
-                                     Interface::HasSyncMethods_, &stub_);
+    SimpleBindingState::BindInternal(
+        std::move(handle), runner, Interface::Name_,
+        base::MakeUnique<typename Interface::RequestValidator_>(),
+        Interface::HasSyncMethods_, &stub_);
   }
 
   InterfaceRequest<Interface> Unbind() {
     InterfaceRequest<Interface> request =
         MakeRequest<Interface>(router_->PassMessagePipe());
     DestroyRouter();
     return std::move(request);
   }
 
   Interface* impl() { return impl_; }
@@ skipping 37 matching lines @@
   AssociatedGroup* associated_group() {
     return endpoint_client_ ? endpoint_client_->associated_group() : nullptr;
   }
 
   void EnableTestingMode();
 
  protected:
   void BindInternal(ScopedMessagePipeHandle handle,
                     scoped_refptr<base::SingleThreadTaskRunner> runner,
                     const char* interface_name,
-                    std::unique_ptr<MessageFilter> request_validator,
+                    std::unique_ptr<MessageReceiver> request_validator,
                     bool has_sync_methods,
                     MessageReceiverWithResponderStatus* stub);
 
   scoped_refptr<internal::MultiplexRouter> router_;
   std::unique_ptr<InterfaceEndpointClient> endpoint_client_;
   base::Closure connection_error_handler_;
 
  private:
   void RunConnectionErrorHandler();
 };
 
 // Uses a multiplexing router. If |Interface| has methods to pass associated
 // interface pointers or requests, this specialization should be used.
 template <typename Interface>
 class BindingState<Interface, true> : public MultiplexedBindingState {
  public:
   explicit BindingState(Interface* impl) : impl_(impl) {
     stub_.set_sink(impl_);
   }
 
   ~BindingState() { Close(); }
 
   void Bind(ScopedMessagePipeHandle handle,
             scoped_refptr<base::SingleThreadTaskRunner> runner) {
     MultiplexedBindingState::BindInternal(
         std::move(handle), runner, Interface::Name_,
-        base::WrapUnique(new typename Interface::RequestValidator_()),
+        base::MakeUnique<typename Interface::RequestValidator_>(),
         Interface::HasSyncMethods_, &stub_);
     stub_.serialization_context()->group_controller = router_;
   }
 
   InterfaceRequest<Interface> Unbind() {
     endpoint_client_.reset();
     InterfaceRequest<Interface> request =
         MakeRequest<Interface>(router_->PassMessagePipe());
     router_ = nullptr;
     connection_error_handler_.Reset();
     return request;
   }
 
   Interface* impl() { return impl_; }
 
  private:
   typename Interface::Stub_ stub_;
   Interface* impl_;
 
   DISALLOW_COPY_AND_ASSIGN(BindingState);
 };
 
 }  // namesapce internal
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_BINDING_STATE_H_