Initial skeletal implementation of the PrincipalService. Also, use the Login()/GetUserBlessing()

services/vanadium/security/principal_service.cc

+// 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.
+
+#include <cstdlib>
+
+#include "mojo/common/binding_set.h"
+#include "mojo/public/c/system/main.h"
+#include "mojo/public/cpp/application/application_connection.h"
+#include "mojo/public/cpp/application/application_delegate.h"
+#include "mojo/public/cpp/application/application_runner.h"
+#include "mojo/public/cpp/application/interface_factory.h"
+#include "mojo/services/vanadium/security/public/interfaces/principal.mojom.h"
+
+namespace mojo {
+namespace services {
+namespace vanadium {
+namespace security {
+
+// This is a native Mojo application which implements |PrincipalService|
+// interface for Linux.
+class PrincipalServiceImpl : public ApplicationDelegate,
+                             public PrincipalService,
+                             public InterfaceFactory<PrincipalService> {
+ public:
+  PrincipalServiceImpl() {
+    CertificatePtr cert(Certificate::New());
+    cert->extension = "default";
+    default_blessing_.chain.push_back(cert.Pass());
+  }
+
+  void Login(const LoginCallback& callback) override {
+    callback.Run(default_blessing_.Clone());
+  }
+
+  void Logout() override {
+  }
+
+  void Sign(mojo::Array<uint8_t> message,
+            const SignCallback& callback) override {
+  }
+
+  void GetUserBlessing(AppInstanceNamePtr app,
+                       const GetUserBlessingCallback& callback) override {
+    callback.Run(default_blessing_.Clone());
+  }
+
+  // |ApplicationDelegate| override.
+  bool ConfigureIncomingConnection(
+      mojo::ApplicationConnection* connection) override {
+    connection->AddService<mojo::PrincipalService>(this);
+    return true;
+  }
+
+  // |InterfaceFactory<PrincipalService>| implementation.
+  void Create(mojo::ApplicationConnection* connection,
+              mojo::InterfaceRequest<mojo::PrincipalService> request) override {
+    binding_.AddBinding(this, request.Pass());
+  }
+
+ private:
+  mojo::BindingSet<mojo::PrincipalService> binding_;
+  mojo::Blessing default_blessing_;
+};
+
+}  // namespace security
+}  // namespace vanadium
+}  // namespace services
+}  // namespace mojo
+
+MojoResult MojoMain(MojoHandle application_request) {
+  mojo::ApplicationRunner runner(
+         new mojo::services::vanadium::security::PrincipalServiceImpl());
+  return runner.Run(application_request);
+}