chrome/browser/component_updater/component_unpacker.h

// Copyright (c) 2011 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_COMPONENT_UPDATER_COMPONENT_UNPACKER_H_
#define CHROME_BROWSER_COMPONENT_UPDATER_COMPONENT_UNPACKER_H_
#pragma once

#include <vector>

#include "base/file_path.h"

class ComponentInstaller;

// In charge of unpacking the component CRX package and verifying that it is
// well formed and the cryptographic signature is correct. If there is no
// error the component specific installer will be invoked to proceed with
// the component installation or update.
//
// This class should be used only by the component updater. It is inspired
// and overlaps with code in the extension's SandboxedExtensionUnpacker.
// The main differences are:
// - The public key hash is full SHA256.
// - Does not use a sandboxed unpacker. A valid component is fully trusted.
// - The manifest can have different attributes and resources are not
//   transcoded.
class ComponentUnpacker {
 public:
  // Possible error conditions.
  enum Error {
    kNone,
    kInvalidParams,
    kInvalidFile,
    kUzipPathError,
    kUnzipFailed,
    kNoManifest,
    kBadManifest,
    kBadExtension,
    kInvalidId,
    kInstallerError,
  };
  // Unpacks, verifies and calls the installer. |pk_hash| is the expected
  // public key SHA256 hash. |path| is the current location of the CRX.
  ComponentUnpacker(const std::vector<uint8>& pk_hash,
                    const FilePath& path,
                    ComponentInstaller* installer);

  // If something went wrong during unpacking or installer invocation, the
  // destructor will delete the unpacked CRX files.
  ~ComponentUnpacker();

  Error error() const { return error_; }

 private:
  FilePath unpack_path_;
  Error error_;
};

#endif  // CHROME_BROWSER_COMPONENT_UPDATER_COMPONENT_UNPACKER_H_