Update cached kiosk app crx from usb stick.

chrome/browser/chromeos/app_mode/kiosk_external_update_validator.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_APP_MODE_KIOSK_EXTERNAL_UPDATE_VALIDATOR_H_
+#define CHROME_BROWSER_CHROMEOS_APP_MODE_KIOSK_EXTERNAL_UPDATE_VALIDATOR_H_
+
+#include <string>
+
+#include "base/files/file_path.h"
+#include "base/memory/weak_ptr.h"
+#include "base/sequenced_task_runner.h"
+#include "chrome/browser/extensions/sandboxed_unpacker.h"
+
+namespace extensions {
+class Extension;
+}
+
+namespace chromeos {
+
+// Delegate class for KioskExternalUpdateValidator, derived class must support
+// WeakPtr.
+class KioskExternalUpdateValidatorDelegate {
+ public:
+  virtual void OnExtenalUpdateUnpackSuccess(
+      const std::string& app_id,
+      const std::string& version,
+      const std::string& min_browser_version,
+      const base::FilePath& temp_dir) = 0;
+  virtual void OnExternalUpdateUnpackFailure(const std::string& app_id) = 0;
+
+ protected:
+  virtual ~KioskExternalUpdateValidatorDelegate() {}
+};
+
+// Unpacks the crx file of the kiosk app and validates its signature.
+class KioskExternalUpdateValidator
+    : public extensions::SandboxedUnpackerClient {
+ public:
+  KioskExternalUpdateValidator(
+      const scoped_refptr<base::SequencedTaskRunner>& backend_task_runner,
+      const std::string& app_id,
+      const base::FilePath& crx_path,
+      const base::FilePath& crx_unpack_dir,
+      base::WeakPtr<KioskExternalUpdateValidatorDelegate> delegate);

[xiyuan, 2014/08/27 16:17:02]

nit: use const reference, i.e.
const base::WeakPtr<KioskExternalUpdateValidatorDelegate>& delegate

[jennyz, 2014/08/28 22:41:06]

Done.

+
+  // Starts validating the external crx file.
+  void Start();
+
+ private:
+  virtual ~KioskExternalUpdateValidator();
+
+  // SandboxedUnpackerClient overrides.
+  virtual void OnUnpackFailure(const base::string16& error_message) OVERRIDE;
+  virtual void OnUnpackSuccess(const base::FilePath& temp_dir,
+                               const base::FilePath& extension_dir,
+                               const base::DictionaryValue* original_manifest,
+                               const extensions::Extension* extension,
+                               const SkBitmap& install_icon) OVERRIDE;
+
+  // Task runner for executing file I/O tasks.
+  const scoped_refptr<base::SequencedTaskRunner> backend_task_runner_;
+  std::string app_id_;
+
+  // The directory where the external crx file resides.
+  base::FilePath crx_dir_;
+  // The temporary directory used by SandBoxedUnpacker for unpacking extensions.
+  const base::FilePath crx_unpack_dir_;
+
+  base::WeakPtr<KioskExternalUpdateValidatorDelegate> delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(KioskExternalUpdateValidator);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_APP_MODE_KIOSK_EXTERNAL_UPDATE_VALIDATOR_H_