Cross Device Promo - Main Eligibility Flow

components/signin/core/browser/device_activity_fetcher.h

+// Copyright 2015 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 COMPONENTS_SIGNIN_CORE_BROWSER_DEVICE_ACTVITIY_FETCHER_H_
+#define COMPONENTS_SIGNIN_CORE_BROWSER_DEVICE_ACTVITIY_FETCHER_H_
+
+#include <vector>
+
+#include "base/time/time.h"
+#include "base/timer/timer.h"
+#include "google_apis/gaia/gaia_auth_consumer.h"
+#include "net/base/backoff_entry.h"
+#include "net/url_request/url_fetcher_delegate.h"
+
+class GaiaAuthFetcher;
+class SigninClient;
+
+namespace net {
+class URLFetcher;
+}
+
+class DeviceActivityFetcher : public GaiaAuthConsumer,
+                              public net::URLFetcherDelegate {
+ public:
+  struct DeviceActivity {
+     base::Time last_active;
+     std::string name;
+  };
+
+  class Observer {
+   public:
+    virtual void OnFetchDeviceActivitySuccess(
+        const std::vector<DeviceActivityFetcher::DeviceActivity>& devices) = 0;
+    virtual void OnFetchDeviceActivityFailure() {}
+  };
+
+  DeviceActivityFetcher(SigninClient* signin_client,
+                        DeviceActivityFetcher::Observer* observer);
+  ~DeviceActivityFetcher() override;
+
+  void Start();
+
+  // Overridden from GaiaAuthConsumer
+  void OnListIdpSessionsSuccess(const std::string& login_hint) override;
+  void OnListIdpSessionsError(const GoogleServiceAuthError& error) override;
+  void OnGetTokenResponseSuccess(const ClientOAuthResult& result) override;
+  void OnGetTokenResponseError(const GoogleServiceAuthError& error) override;
+
+  // Overridden from URLFetcherDelegate
+  void OnURLFetchComplete(const net::URLFetcher* source) override;
+
+ private:
+  void StartFetchingListIdpSessions();
+  void StartFetchingGetTokenResponse();
+  void StartFetchingListDevices();
+
+  // Gaia fetcher used for acquiring an access token.
+  scoped_ptr<GaiaAuthFetcher> gaia_auth_fetcher_;
+  // URL Fetcher used for calling List Devices.
+  scoped_ptr<net::URLFetcher> url_fetcher_;
+
+  // If either fetcher fails, retry with exponential backoff.
+  net::BackoffEntry fetcher_backoff_;
+  base::OneShotTimer<DeviceActivityFetcher> fetcher_timer_;
+  int fetcher_retries_;
+
+  std::string access_token_;
+  std::string login_hint_;
+
+  SigninClient* signin_client_;  // Weak pointer.
+  Observer* observer_;
+
+  DISALLOW_COPY_AND_ASSIGN(DeviceActivityFetcher);
+};
+
+#endif  // COMPONENTS_SIGNIN_CORE_BROWSER_DEVICE_ACTVITIY_FETCHER_H_