Support asynchronous patching operations in the component updater.

chrome/browser/component_updater/component_unpacker.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_COMPONENT_UPDATER_COMPONENT_UNPACKER_H_
 #define CHROME_BROWSER_COMPONENT_UPDATER_COMPONENT_UNPACKER_H_
 
 #include <string>
 #include <vector>
-#include "base/basictypes.h"
-#include "base/files/file_path.h"
+#include "base/callback.h"
 
 class ComponentInstaller;
 class ComponentPatcher;
 
-// 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 SandboxedUnpacker.
-// 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.
-  // Add only to the bottom of this enum; the order must be kept stable.
-  enum Error {
-    kNone,
-    kInvalidParams,
-    kInvalidFile,
-    kUnzipPathError,
-    kUnzipFailed,
-    kNoManifest,
-    kBadManifest,
-    kBadExtension,
-    kInvalidId,
-    kInstallerError,
-    kIoError,
-    kDeltaVerificationFailure,
-    kDeltaBadCommands,
-    kDeltaUnsupportedCommand,
-    kDeltaOperationFailure,
-    kDeltaPatchProcessFailure,
-    kDeltaMissingExistingFile,
-    kFingerprintWriteFailed,
-  };
-  // 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 base::FilePath& path,
-                    const std::string& fingerprint,
-                    ComponentPatcher* patcher,
-                    ComponentInstaller* installer);
+namespace base {
+class FilePath;
+}
 
-  // If something went wrong during unpacking or installer invocation, the
-  // destructor will delete the unpacked CRX files.
-  ~ComponentUnpacker();
+namespace component_updater {
 
-  Error error() const { return error_; }
-
-  int extended_error() const { return extended_error_; }
-
- private:
-  base::FilePath unpack_path_;
-  Error error_;
-  int extended_error_;  // Provides additional error information.
+// Possible error conditions.
+// Add only to the bottom of this enum; the order must be kept stable.
+enum Error {
+  kNone,
+  kInvalidParams,
+  kInvalidFile,
+  kUnzipPathError,
+  kUnzipFailed,
+  kNoManifest,
+  kBadManifest,
+  kBadExtension,
+  kInvalidId,
+  kInstallerError,
+  kIoError,
+  kDeltaVerificationFailure,
+  kDeltaBadCommands,
+  kDeltaUnsupportedCommand,
+  kDeltaOperationFailure,
+  kDeltaPatchProcessFailure,
+  kDeltaMissingExistingFile,
+  kFingerprintWriteFailed,
 };
 
+// Asynchronously unpacks, verifies and calls the installer. |pk_hash| is
+// the expected public key SHA256 hash. |path| is the current location of
+// the CRX. When done, runs |callback| with the error and extra error code.
+// The callback will be run on the FILE thread.
+void Unpack(const std::vector<uint8>& pk_hash,
+            const base::FilePath& path,
+            const std::string& fingerprint,
+            ComponentPatcher* patcher,
+            ComponentInstaller* installer,
+            const base::Callback<void(Error, int)>& callback);
+
+}  // namespace component_updater
 #endif  // CHROME_BROWSER_COMPONENT_UPDATER_COMPONENT_UNPACKER_H_