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

examples/bank_app/bank.cc

Index: examples/bank_app/bank.cc
diff --git a/examples/bank_app/bank.cc b/examples/bank_app/bank.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 "examples/bank_app/bank.mojom.h"
+#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_impl.h"
+#include "mojo/public/cpp/application/application_runner.h"
+#include "mojo/public/cpp/application/interface_factory.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+#include "mojo/public/cpp/utility/run_loop.h"
+#include "mojo/services/vanadium/security/public/interfaces/principal.mojom.h"
+
+namespace mojo {
+namespace examples {
+
+class BankImpl : public Bank {
+ public:
+  BankImpl() : balance_(0) {
+  }
+  void Deposit(const int32_t usd) override { balance_ += usd; }
+  void Withdraw(const int32_t usd) override { balance_ -= usd; }
+  void GetBalance(const GetBalanceCallback& callback) override {
+    callback.Run(balance_);
+  }
+  void Run(const BlessingPtr& b) const {
+    user_.clear();
+    if (b.get()) {
+      for (size_t i = 0; i < b.get()->chain.size(); i++) {
+        user_ += "/";
+        user_ += b.get()->chain[i].get()->extension;
+      }
+    }
+    RunLoop::current()->Quit();  // All done!
+  }
+ private:
+  mutable std::string user_;
+  int32_t balance_;
+};
+
+class BankApp : public mojo::ApplicationDelegate,
+                public mojo::InterfaceFactory<Bank> {
+ public:
+  BankApp() : binding_(&bank_impl_) {}
+
+  void Initialize(ApplicationImpl* app) override {
+    app->ConnectToService("mojo:principal_service", &login_service_);
+  }
+
+  // From ApplicationDelegate
+  bool ConfigureIncomingConnection(
+      mojo::ApplicationConnection* connection) override {
+    AppInstanceNamePtr app(AppInstanceName::New());
+    app->url = connection->GetRemoteApplicationURL();
+    // Authorize user access to the bank account
+    login_service_->GetUserBlessing(app.Pass(), bank_impl_);
+    connection->AddService<Bank>(this);
+    return true;
+  }
+
+  void Create(mojo::ApplicationConnection* connection,
+              mojo::InterfaceRequest<Bank> request) override {
+    binding_.Bind(request.Pass());
+  }
+
+ private:
+  BankImpl bank_impl_;
+  mojo::Binding<Bank> binding_;
+  PrincipalServicePtr login_service_;
+};
+
+}  // namespace examples
+}  // namespace mojo
+
+MojoResult MojoMain(MojoHandle application_request) {
+  mojo::ApplicationRunner runner(new mojo::examples::BankApp());
+  return runner.Run(application_request);
+}