arc: Pass auth token from Chrome to ARC instance.

chrome/browser/chromeos/arc/arc_auth_service.h

 // Copyright 2016 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 CHROME_BROWSER_CHROMEOS_ARC_ARC_AUTH_SERVICE_H_
 #define CHROME_BROWSER_CHROMEOS_ARC_ARC_AUTH_SERVICE_H_
 
 #include "base/macros.h"
+#include "base/observer_list.h"
+#include "base/threading/thread_checker.h"
+#include "chrome/browser/chromeos/arc/arc_auth_fetcher.h"
+#include "chrome/browser/chromeos/arc/arc_auth_ui.h"
 #include "components/arc/arc_bridge_service.h"
 #include "components/arc/arc_service.h"
 #include "components/arc/common/auth.mojom.h"
 #include "mojo/public/cpp/bindings/binding.h"
 
+class Profile;
+
 namespace arc {
 
 // This class proxies the request from the client to fetch an auth code from
 // LSO.
 class ArcAuthService : public ArcService,
                        public AuthHost,
-                       public ArcBridgeService::Observer {
+                       public ArcBridgeService::Observer,
+                       public ArcAuthFetcher::Delegate,
+                       public ArcAuthUI::Delegate {
  public:
+  enum class State {
+    DISABLE,        // ARC is not allowed to run (default).
+    FETCHING_CODE,  // ARC is allowed, receiving  auth_2 code.
+    NO_CODE,        // ARC is allowed, auth_2 code was not received.
+    ENABLE,         // ARC is allowed, auth_2 code was received.
+  };
+
+  class Observer {
+   public:
+    // Called whenever Opt-In state of the ARC has been changed.
+    virtual void OnOptInChanged(State state) = 0;
+  };
+
   explicit ArcAuthService(ArcBridgeService* bridge_service);
   ~ArcAuthService() override;
 
- private:
+  static ArcAuthService* Get();
+
+  static void DisableUIForTesting();
+
+  void SetProfile(Profile* profile);
+
+  State state() const { return state_; }
+
+  // Sets the auth code. Can be set from internally or from external component
+  // that accepts user's credentials. This actually starts ARC bridge service.
+  void SetAuthCodeAndStartArc(const std::string auth_code);
+
+  std::string GetAuthCode();
+
+  // Adds or removes observers.
+  void AddObserver(Observer* observer);
+  void RemoveObserver(Observer* observer);
+
   // Overrides ArcBridgeService::Observer.
   void OnAuthInstanceReady() override;
 
-  // Overrides AuthHost.
+  // Overrides AuthHost.  For security reason this code can be used only
+  // once and exists for specific period of time.
   void GetAuthCode(const GetAuthCodeCallback& callback) override;
 
+  // Overrides ArcAuthFetcher::Delegate.
+  void OnAuthCodeFetched(const std::string& auth_code) override;
+  void OnAuthCodeNeedUI() override;
+  void OnAuthCodeFailed() override;
+
+  // Overrides ArcAuthUI::Delegate.
+  void OnAuthUIClosed() override;
+
+ private:
+  void FetchAuthCode();
+  void CloseUI();
+
+  // Unowned pointer. Keeps current profile.
+  Profile* profile_ = nullptr;
+
+  // Owned by view hierarchy.
+  ArcAuthUI* auth_ui_ = nullptr;
+
   mojo::Binding<AuthHost> binding_;
+  base::ThreadChecker thread_checker_;
+  State state_ = State::DISABLE;
+  base::ObserverList<Observer> observer_list_;
+  scoped_ptr<ArcAuthFetcher> auth_fetcher_;
+  std::string auth_code_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcAuthService);
 };
 
 }  // namespace arc
 
 #endif  // CHROME_BROWSER_CHROMEOS_ARC_ARC_AUTH_SERVICE_H_