Turn AccountManager into pure abstract interface.

PiperOrigin-RevId: 591143389

internal/platform/implementation/BUILD

@@ -16,6 +16,7 @@ licenses(["notice"])
 cc_library(
     name = "types",
     hdrs = [
+        "account_manager.h",
         "atomic_boolean.h",
         "atomic_reference.h",
         "bluetooth_adapter.h",
@@ -41,6 +42,7 @@ cc_library(
     visibility = [
         "//connections/implementation/analytics:__subpackages__",
         "//fastpair:__subpackages__",
+        "//internal/account:__pkg__",
         "//internal/crypto_cros:__pkg__",
         "//internal/platform:__pkg__",
         "//internal/platform/implementation:__subpackages__",
@@ -57,6 +59,7 @@ cc_library(
         "//internal/platform:base",
         "@com_google_absl//absl/base:core_headers",
         "@com_google_absl//absl/functional:any_invocable",
+        "@com_google_absl//absl/status",
         "@com_google_absl//absl/strings",
         "@com_google_absl//absl/time",
         "@com_google_absl//absl/types:span",

internal/platform/implementation/account_manager.h

@@ -0,0 +1,84 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef PLATFORM_API_ACCOUNT_MANAGER_H_
+#define PLATFORM_API_ACCOUNT_MANAGER_H_
+
+#include <optional>
+#include <string>
+
+#include "absl/functional/any_invocable.h"
+#include "absl/status/status.h"
+#include "absl/strings/string_view.h"
+
+namespace nearby {
+
+// AccountManager manages the accounts are used to access Nearby backend.
+// In current design, AccountManager only support one active account.
+class AccountManager {
+ public:
+  // Describes a Nearby account. The account class will have more properties
+  // and methods in the future based on the new feature added.
+  struct Account {
+    std::string id;  // The unique identify of the account.
+    std::string display_name;
+    std::string family_name;
+    std::string given_name;
+    std::string picture_url;
+    std::string email;
+  };
+
+  // Observes the activity of the account manager.
+  class Observer {
+   public:
+    virtual ~Observer() = default;
+
+    virtual void OnLoginSucceeded(absl::string_view account_id) = 0;
+    virtual void OnLogoutSucceeded(absl::string_view account_id) = 0;
+  };
+
+  virtual ~AccountManager() = default;
+
+  // Gets current active account. If no login user, return std::nullopt.
+  virtual std::optional<Account> GetCurrentAccount() = 0;
+
+  // Initializes the login process for a Google account.
+  // |login_success_callback| is called when the login succeeded. Account
+  // information is passed to callback.
+  // |login_failure_callback| is called when the login fails.
+  virtual void Login(absl::AnyInvocable<void(Account)> login_success_callback,
+                     absl::AnyInvocable<void()> login_failure_callback) = 0;
+
+  // Logs out current active account. |logout_callback| is called when logout is
+  // completed.
+  virtual void Logout(
+      absl::AnyInvocable<void(absl::Status)> logout_callback) = 0;
+
+  // Gets access token for the active account.
+  // |success_callback| is called when an access token is fetched successfully.
+  // |failure_callback| is called when fetching an access token failed.
+  //
+  // Returns false if account_id is empty or callback is null.
+  virtual bool GetAccessToken(
+      absl::string_view account_id,
+      absl::AnyInvocable<void(absl::string_view)> success_callback,
+      absl::AnyInvocable<void(absl::Status)> failure_callback) = 0;
+
+  virtual void AddObserver(Observer* observer) = 0;
+  virtual void RemoveObserver(Observer* observer) = 0;
+};
+
+}  // namespace nearby
+
+#endif  // PLATFORM_API_ACCOUNT_MANAGER_H_