google_apis/gaia/identity_provider.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef GOOGLE_APIS_GAIA_IDENTITY_PROVIDER_H_
   6 #define GOOGLE_APIS_GAIA_IDENTITY_PROVIDER_H_
   7
   8 #include <string>
   9
  10 #include "base/compiler_specific.h"
  11 #include "base/macros.h"
  12 #include "base/observer_list.h"
  13 #include "google_apis/gaia/oauth2_token_service.h"
  14
  15 // Helper class that provides access to information about logged-in GAIA
  16 // accounts. Each instance of this class references an entity who may be logged
  17 // in to zero, one or multiple GAIA accounts. The class provides access to the
  18 // OAuth tokens for all logged-in accounts and indicates which of these is
  19 // currently active.
  20 // The main purpose of this abstraction layer is to isolate consumers of GAIA
  21 // information from the different sources and various token service
  22 // implementations. Whenever possible, consumers of GAIA information should be
  23 // provided with an instance of this class instead of accessing other GAIA APIs
  24 // directly.
  25 class IdentityProvider : public OAuth2TokenService::Observer {
  26  public:
  27   class Observer {
  28    public:
  29     // Called when a GAIA account logs in and becomes the active account. All
  30     // account information is available when this method is called and all
  31     // |IdentityProvider| methods will return valid data.
  32     virtual void OnActiveAccountLogin() {}
  33
  34     // Called when the active GAIA account logs out. The account information may
  35     // have been cleared already when this method is called. The
  36     // |IdentityProvider| methods may return inconsistent or outdated
  37     // information if called from within OnLogout().
  38     virtual void OnActiveAccountLogout() {}
  39
  40    protected:
  41     virtual ~Observer();
  42   };
  43
  44   ~IdentityProvider() override;
  45
  46   // Adds and removes observers that will be notified of changes to the refresh
  47   // token availability for the active account.
  48   void AddActiveAccountRefreshTokenObserver(
  49       OAuth2TokenService::Observer* observer);
  50   void RemoveActiveAccountRefreshTokenObserver(
  51       OAuth2TokenService::Observer* observer);
  52
  53   // Gets the active account's user name.
  54   virtual std::string GetActiveUsername() = 0;
  55
  56   // Gets the active account's account ID.
  57   virtual std::string GetActiveAccountId() = 0;
  58
  59   // Gets the token service vending OAuth tokens for all logged-in accounts.
  60   virtual OAuth2TokenService* GetTokenService() = 0;
  61
  62   // Requests login to a GAIA account. Implementations can show a login UI, log
  63   // in automatically if sufficient credentials are available or may ignore the
  64   // request. Returns true if the login request was processed and false if it
  65   // was ignored.
  66   virtual bool RequestLogin() = 0;
  67
  68   void AddObserver(Observer* observer);
  69   void RemoveObserver(Observer* observer);
  70
  71   // OAuth2TokenService::Observer:
  72   void OnRefreshTokenAvailable(const std::string& account_id) override;
  73   void OnRefreshTokenRevoked(const std::string& account_id) override;
  74   void OnRefreshTokensLoaded() override;
  75
  76  protected:
  77   IdentityProvider();
  78
  79   // Fires an OnActiveAccountLogin notification.
  80   void FireOnActiveAccountLogin();
  81
  82   // Fires an OnActiveAccountLogout notification.
  83   void FireOnActiveAccountLogout();
  84
  85  private:
  86   ObserverList<Observer, true> observers_;
  87   ObserverList<OAuth2TokenService::Observer, true> token_service_observers_;
  88   int token_service_observer_count_;
  89
  90   DISALLOW_COPY_AND_ASSIGN(IdentityProvider);
  91 };
  92
  93 #endif  // GOOGLE_APIS_GAIA_IDENTITY_PROVIDER_H_