Move ExtensionDownloader to //extensions

chrome/browser/extensions/updater/extension_downloader_delegate.h

-// Copyright (c) 2012 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_EXTENSIONS_UPDATER_EXTENSION_DOWNLOADER_DELEGATE_H_
-#define CHROME_BROWSER_EXTENSIONS_UPDATER_EXTENSION_DOWNLOADER_DELEGATE_H_
-
-#include <set>
-#include <string>
-
-#include "base/time/time.h"
-#include "extensions/browser/updater/manifest_fetch_data.h"
-
-class GURL;
-
-namespace base {
-class FilePath;
-}
-
-namespace extensions {
-
-class ExtensionDownloaderDelegate {
- public:
-  virtual ~ExtensionDownloaderDelegate();
-
-  // Passed as an argument to ExtensionDownloader::OnExtensionDownloadFailed()
-  // to detail the reason for the failure.
-  enum Error {
-    // Background networking is disabled.
-    DISABLED,
-
-    // Failed to fetch the manifest for this extension.
-    MANIFEST_FETCH_FAILED,
-
-    // The manifest couldn't be parsed.
-    MANIFEST_INVALID,
-
-    // The manifest was fetched and parsed, and there are no updates for
-    // this extension.
-    NO_UPDATE_AVAILABLE,
-
-    // There was an update for this extension but the download of the crx
-    // failed.
-    CRX_FETCH_FAILED,
-  };
-
-  // Passed as an argument to the completion callbacks to signal whether
-  // the extension update sent a ping.
-  struct PingResult {
-    PingResult();
-    ~PingResult();
-
-    // Whether a ping was sent.
-    bool did_ping;
-
-    // The start of day, from the server's perspective. This is only valid
-    // when |did_ping| is true.
-    base::Time day_start;
-  };
-
-  // One of the following 3 methods is always invoked for a given extension
-  // id, if AddExtension() or AddPendingExtension() returned true when that
-  // extension was added to the ExtensionDownloader.
-  // To avoid duplicate work, ExtensionDownloader might merge multiple identical
-  // requests, so there is not necessarily a separate invocation of one of these
-  // methods for each call to AddExtension/AddPendingExtension. If it is
-  // important to be able to match up AddExtension calls with
-  // OnExtensionDownload callbacks, you need to make sure that for every call to
-  // AddExtension/AddPendingExtension the combination of extension id and
-  // request id is unique. The OnExtensionDownload related callbacks will then
-  // be called with all request ids that resulted in that extension being
-  // checked.
-
-  // Invoked if the extension couldn't be downloaded. |error| contains the
-  // failure reason.
-  virtual void OnExtensionDownloadFailed(const std::string& id,
-                                         Error error,
-                                         const PingResult& ping_result,
-                                         const std::set<int>& request_ids);
-
-  // Invoked if the extension had an update available and its crx was
-  // successfully downloaded to |path|. |ownership_passed| is true if delegate
-  // should get ownership of the file.
-  virtual void OnExtensionDownloadFinished(
-      const std::string& id,
-      const base::FilePath& path,
-      bool file_ownership_passed,
-      const GURL& download_url,
-      const std::string& version,
-      const PingResult& ping_result,
-      const std::set<int>& request_ids) = 0;
-
-  // The remaining methods are used by the ExtensionDownloader to retrieve
-  // information about extensions from the delegate.
-
-  // Invoked to fill the PingData for the given extension id. Returns false
-  // if PingData should not be included for this extension's update check
-  // (this is the default).
-  virtual bool GetPingDataForExtension(const std::string& id,
-                                       ManifestFetchData::PingData* ping);
-
-  // Invoked to get the update url data for this extension's update url, if
-  // there is any. The default implementation returns an empty string.
-  virtual std::string GetUpdateUrlData(const std::string& id);
-
-  // Invoked to determine whether extension |id| is currently
-  // pending installation.
-  virtual bool IsExtensionPending(const std::string& id) = 0;
-
-  // Invoked to get the current version of extension |id|. Returns false if
-  // that extension is not installed.
-  virtual bool GetExtensionExistingVersion(const std::string& id,
-                                           std::string* version) = 0;
-
-  // Determines if a given extension should be forced to update and (if so)
-  // what the source of this forcing is (i.e. what string will be passed
-  // in |installsource| as part of the update query parameters). The default
-  // implementation always returns |false|.
-  virtual bool ShouldForceUpdate(const std::string& id,
-                                 std::string* source);
-};
-
-}  // namespace extensions
-
-#endif  // CHROME_BROWSER_EXTENSIONS_UPDATER_EXTENSION_DOWNLOADER_DELEGATE_H_