Files.app: Add an private API to get a download URL

chrome/browser/chromeos/drive/drive_readonly_token_fetcher.h

+// 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.
+
+#ifndef CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_READONLY_TOKEN_FETCHER_H_
+#define CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_READONLY_TOKEN_FETCHER_H_
+
+#include <queue>
+
+#include "base/basictypes.h"
+#include "base/callback.h"
+#include "base/threading/thread_checker.h"
+#include "base/time/time.h"
+#include "google_apis/drive/auth_service_interface.h"
+#include "google_apis/gaia/oauth2_token_service.h"
+
+namespace drive {
+
+// OAuthTokenFetcher caches OAuth access tokens and refreshes them as needed.
+class DriveReadonlyTokenFetcher : public OAuth2TokenService::Consumer {

[kinaba, 2014/07/09 06:02:47]

This class looks almost functionally identical to google_apis::AuthRequest.
Can we merge them into one? At, least, I think the class can be in
google_apis/drive rather than c/b/drive.

+ public:
+  DriveReadonlyTokenFetcher(
+      const std::string& account_id,
+      OAuth2TokenService* oauth2_token_service,
+      const google_apis::AuthStatusCallback& callback);
+  virtual ~DriveReadonlyTokenFetcher();
+
+ private:
+  // Overridden from OAuth2TokenService::Consumer:
+  virtual void OnGetTokenSuccess(const OAuth2TokenService::Request* request,
+                                 const std::string& access_token,
+                                 const base::Time& expiration_time) OVERRIDE;
+  virtual void OnGetTokenFailure(const OAuth2TokenService::Request* request,
+                                 const GoogleServiceAuthError& error) OVERRIDE;
+
+  google_apis::AuthStatusCallback callback_;
+  scoped_ptr<OAuth2TokenService::Request> request_;
+  base::ThreadChecker thread_checker_;
+
+  DISALLOW_COPY_AND_ASSIGN(DriveReadonlyTokenFetcher);
+};
+
+}  // namespace drive
+
+#endif  // CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_READONLY_TOKEN_FETCHER_H_