Parse messages.json in ExtensionUnpacker (like we do for manifest)....

chrome/browser/extensions/sandboxed_extension_unpacker.h

 // Copyright (c) 2009 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_SANDBOXED_EXTENSION_UNPACKER_H_
 #define CHROME_BROWSER_EXTENSIONS_SANDBOXED_EXTENSION_UNPACKER_H_
 
 #include <string>
 
 #include "base/file_path.h"
 #include "base/ref_counted.h"
 #include "base/scoped_temp_dir.h"
 #include "base/values.h"
 #include "chrome/browser/utility_process_host.h"
 
 class Extension;
 class MessageLoop;
 class ResourceDispatcherHost;
 
 class SandboxedExtensionUnpackerClient
     : public base::RefCountedThreadSafe<SandboxedExtensionUnpackerClient> {
  public:
-  // temp_dir - A temporary directoy containing the results of the extension
+  // temp_dir - A temporary directory containing the results of the extension
   // unpacking. The client is responsible for deleting this directory.
   //
   // extension_root - The path to the extension root inside of temp_dir.
   //
   // extension - The extension that was unpacked. The client is responsible
   // for deleting this memory.
   virtual void OnUnpackSuccess(const FilePath& temp_dir,
                                const FilePath& extension_root,
                                Extension* extension) = 0;
   virtual void OnUnpackFailure(const std::string& error) = 0;
 
  protected:
   friend class base::RefCountedThreadSafe<SandboxedExtensionUnpackerClient>;
 
   virtual ~SandboxedExtensionUnpackerClient() {}
 };
 
 // SandboxedExtensionUnpacker unpacks extensions from the CRX format into a
 // directory. This is done in a sandboxed subprocess to protect the browser
 // process from parsing complex formats like JPEG or JSON from untrusted
 // sources.
 //
 // Unpacking an extension using this class makes minor changes to its source,
-// such as transcoding all images to PNG and rewriting the manifest JSON. As
-// such, it should not be used when the output is not intended to be given back
-// to the author.
+// such as transcoding all images to PNG, parsing all message catalogs
+// and rewriting the manifest JSON. As such, it should not be used when the
+// output is not intended to be given back to the author.
 //
 //
 // Lifetime management:
 //
 // This class is ref-counted by each call it makes to itself on another thread,
 // and by UtilityProcessHost.
 //
 // Additionally, we hold a reference to our own client so that it lives at least
 // long enough to receive the result of unpacking.
 //
@@ skipping 35 matching lines @@
   SandboxedExtensionUnpacker(const FilePath& crx_path,
                              ResourceDispatcherHost* rdh,
                              SandboxedExtensionUnpackerClient* cilent);
 
   // Start unpacking the extension. The client is called with the results.
   void Start();
 
  private:
   class ProcessHostClient;
   friend class ProcessHostClient;
+  friend class SandboxedExtensionUnpackerTest;
 
   ~SandboxedExtensionUnpacker() {}
 
   // Validates the signature of the extension and extract the key to
   // |public_key_|. Returns true if the signature validates, false otherwise.
   //
   // NOTE: Having this method here is a bit ugly. This code should really live
   // in ExtensionUnpacker as it is not specific to sandboxed unpacking. It was
   // put here because we cannot run windows crypto code in the sandbox. But we
   // could still have this method statically on ExtensionUnpacker so that code
   // just for unpacking is there and code just for sandboxing of unpacking is
   // here.
   bool ValidateSignature();
 
   // Starts the utility process that unpacks our extension.
   void StartProcessOnIOThread(const FilePath& temp_crx_path);
 
   // SandboxedExtensionUnpacker
-  void OnUnpackExtensionSucceeded(const DictionaryValue& manifest);
+  void OnUnpackExtensionSucceeded(const DictionaryValue& manifest,
+                                  const DictionaryValue& catalogs);
   void OnUnpackExtensionFailed(const std::string& error_message);
   void OnProcessCrashed();
 
   void ReportFailure(const std::string& message);
   void ReportSuccess();
 
+  // Overwrites original manifest with safe result from utility process.
+  // Returns NULL on error. Caller owns the returned object.
+  DictionaryValue* RewriteManifestFile(const DictionaryValue& manifest);
+
+  // Overwrites original files with safe results from utility process.
+  // Reports error and returns false if it fails.
+  bool RewriteImageFiles();
+  bool RewriteCatalogFiles(const DictionaryValue& parsed_catalogs);
+
   FilePath crx_path_;
   ChromeThread::ID thread_identifier_;
   ResourceDispatcherHost* rdh_;
   scoped_refptr<SandboxedExtensionUnpackerClient> client_;
   ScopedTempDir temp_dir_;
   FilePath extension_root_;
   scoped_ptr<Extension> extension_;
   bool got_response_;
   std::string public_key_;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_SANDBOXED_EXTENSION_UNPACKER_H_