chrome/browser/supervised_user/experimental/supervised_user_blacklist_downloader.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 CHROME_BROWSER_SUPERVISED_USER_EXPERIMENTAL_SUPERVISED_USER_BLACKLIST_DOWNLOADER_H_
   6 #define CHROME_BROWSER_SUPERVISED_USER_EXPERIMENTAL_SUPERVISED_USER_BLACKLIST_DOWNLOADER_H_
   7
   8 #include "base/callback.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "base/memory/weak_ptr.h"
  11 #include "net/url_request/url_fetcher_delegate.h"
  12
  13 namespace base {
  14 class FilePath;
  15 }  // namespace base
  16
  17 namespace net {
  18 class URLFetcher;
  19 class URLRequestContextGetter;
  20 }  // namespace net
  21
  22 class GURL;
  23
  24 // Helper class to download a blacklist file from a given URL and store it in a
  25 // local file. If the local file already exists, reports success without
  26 // downloading anything.
  27 class SupervisedUserBlacklistDownloader : public net::URLFetcherDelegate {
  28  public:
  29   typedef base::Callback<void(bool /* success */)> DownloadFinishedCallback;
  30
  31   // Directly starts the download (if necessary) and runs |callback| when done.
  32   // If the instance is destroyed before it is finished, |callback| is not run.
  33   SupervisedUserBlacklistDownloader(
  34       const GURL& url,
  35       const base::FilePath& path,
  36       net::URLRequestContextGetter* request_context,
  37       const DownloadFinishedCallback& callback);
  38   ~SupervisedUserBlacklistDownloader() override;
  39
  40  private:
  41   // net::URLFetcherDelegate implementation.
  42   void OnURLFetchComplete(const net::URLFetcher* source) override;
  43
  44   void OnFileExistsCheckDone(bool exists);
  45
  46   DownloadFinishedCallback callback_;
  47
  48   scoped_ptr<net::URLFetcher> fetcher_;
  49
  50   base::WeakPtrFactory<SupervisedUserBlacklistDownloader> weak_ptr_factory_;
  51
  52   DISALLOW_COPY_AND_ASSIGN(SupervisedUserBlacklistDownloader);
  53 };
  54
  55 #endif  // CHROME_BROWSER_SUPERVISED_USER_EXPERIMENTAL_SUPERVISED_USER_BLACKLIST_DOWNLOADER_H_