chrome/browser/extensions/updater/extension_downloader_delegate.h

   1 // Copyright (c) 2012 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_EXTENSIONS_UPDATER_EXTENSION_DOWNLOADER_DELEGATE_H_
   6 #define CHROME_BROWSER_EXTENSIONS_UPDATER_EXTENSION_DOWNLOADER_DELEGATE_H_
   7
   8 #include <set>
   9 #include <string>
  10
  11 #include "base/time/time.h"
  12 #include "chrome/browser/extensions/updater/manifest_fetch_data.h"
  13
  14 class GURL;
  15
  16 namespace base {
  17 class FilePath;
  18 }
  19
  20 namespace extensions {
  21
  22 class ExtensionDownloaderDelegate {
  23  public:
  24   virtual ~ExtensionDownloaderDelegate();
  25
  26   // Passed as an argument to ExtensionDownloader::OnExtensionDownloadFailed()
  27   // to detail the reason for the failure.
  28   enum Error {
  29     // Background networking is disabled.
  30     DISABLED,
  31
  32     // Failed to fetch the manifest for this extension.
  33     MANIFEST_FETCH_FAILED,
  34
  35     // The manifest couldn't be parsed.
  36     MANIFEST_INVALID,
  37
  38     // The manifest was fetched and parsed, and there are no updates for
  39     // this extension.
  40     NO_UPDATE_AVAILABLE,
  41
  42     // There was an update for this extension but the download of the crx
  43     // failed.
  44     CRX_FETCH_FAILED,
  45   };
  46
  47   // Passed as an argument to the completion callbacks to signal whether
  48   // the extension update sent a ping.
  49   struct PingResult {
  50     PingResult();
  51     ~PingResult();
  52
  53     // Whether a ping was sent.
  54     bool did_ping;
  55
  56     // The start of day, from the server's perspective. This is only valid
  57     // when |did_ping| is true.
  58     base::Time day_start;
  59   };
  60
  61   // One of the following 3 methods is always invoked for a given extension
  62   // id, if AddExtension() or AddPendingExtension() returned true when that
  63   // extension was added to the ExtensionDownloader.
  64   // To avoid duplicate work, ExtensionDownloader might merge multiple identical
  65   // requests, so there is not necessarily a separate invocation of one of these
  66   // methods for each call to AddExtension/AddPendingExtension. If it is
  67   // important to be able to match up AddExtension calls with
  68   // OnExtensionDownload callbacks, you need to make sure that for every call to
  69   // AddExtension/AddPendingExtension the combination of extension id and
  70   // request id is unique. The OnExtensionDownload related callbacks will then
  71   // be called with all request ids that resulted in that extension being
  72   // checked.
  73
  74   // Invoked if the extension couldn't be downloaded. |error| contains the
  75   // failure reason.
  76   virtual void OnExtensionDownloadFailed(const std::string& id,
  77                                          Error error,
  78                                          const PingResult& ping_result,
  79                                          const std::set<int>& request_ids);
  80
  81   // Invoked if the extension had an update available and its crx was
  82   // successfully downloaded to |path|. Ownership of that file is transferred
  83   // to the delegate.
  84   virtual void OnExtensionDownloadFinished(
  85       const std::string& id,
  86       const base::FilePath& path,
  87       const GURL& download_url,
  88       const std::string& version,
  89       const PingResult& ping_result,
  90       const std::set<int>& request_ids) = 0;
  91
  92   // The remaining methods are used by the ExtensionDownloader to retrieve
  93   // information about extensions from the delegate.
  94
  95   // Invoked to fill the PingData for the given extension id. Returns false
  96   // if PingData should not be included for this extension's update check
  97   // (this is the default).
  98   virtual bool GetPingDataForExtension(const std::string& id,
  99                                        ManifestFetchData::PingData* ping);
 100
 101   // Invoked to get the update url data for this extension's update url, if
 102   // there is any. The default implementation returns an empty string.
 103   virtual std::string GetUpdateUrlData(const std::string& id);
 104
 105   // Invoked to determine whether extension |id| is currently
 106   // pending installation.
 107   virtual bool IsExtensionPending(const std::string& id) = 0;
 108
 109   // Invoked to get the current version of extension |id|. Returns false if
 110   // that extension is not installed.
 111   virtual bool GetExtensionExistingVersion(const std::string& id,
 112                                            std::string* version) = 0;
 113 };
 114
 115 }  // namespace extensions
 116
 117 #endif  // CHROME_BROWSER_EXTENSIONS_UPDATER_EXTENSION_DOWNLOADER_DELEGATE_H_