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

examples/bank_app/customer.cc

Index: examples/bank_app/customer.cc
diff --git a/examples/bank_app/customer.cc b/examples/bank_app/customer.cc
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+++ b/examples/bank_app/customer.cc
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+// 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.
+
+#include <stdio.h>
+
+#include "examples/bank_app/bank.mojom.h"
+#include "mojo/public/c/system/main.h"
+#include "mojo/public/cpp/application/application_delegate.h"
+#include "mojo/public/cpp/application/application_impl.h"
+#include "mojo/public/cpp/application/application_runner.h"
+#include "mojo/public/cpp/utility/run_loop.h"
+#include "mojo/services/vanadium/security/public/interfaces/principal.mojom.h"
+
+namespace mojo {
+namespace examples {
+
+class BankCustomer : public ApplicationDelegate {
+ public:
+  void Initialize(ApplicationImpl* app) override {
+    // Get user login credentials
+    app->ConnectToService("mojo:principal_service", &login_service_);
+    login_service_->Login(PrincipalService::LoginCallback());
+
+    // Deposit some money and check the balance
+    app->ConnectToService("mojo:bank", &bank_);
+    bank_->Deposit(500/*usd*/);
+    bank_->Withdraw(100/*usd*/);
+    bank_->GetBalance(Bank::GetBalanceCallback());
+  }
+
+  void Quit() override {
+    login_service_->Logout();
+  }
+
+ private:
+  BankPtr bank_;
+  PrincipalServicePtr login_service_;
+};
+
+}  // namespace examples
+}  // namespace mojo
+
+MojoResult MojoMain(MojoHandle application_request) {
+  mojo::ApplicationRunner runner(new mojo::examples::BankCustomer);
+  return runner.Run(application_request);
+}