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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "chrome/browser/component_updater/component_patcher.h"
      6 
      7 #include <string>
      8 #include <vector>
      9 
     10 #include "base/file_util.h"
     11 #include "base/json/json_file_value_serializer.h"
     12 #include "base/values.h"
     13 #include "chrome/browser/component_updater/component_patcher_operation.h"
     14 #include "chrome/browser/component_updater/component_updater_service.h"
     15 
     16 namespace {
     17 
     18 // Deserialize the commands file (present in delta update packages). The top
     19 // level must be a list.
     20 base::ListValue* ReadCommands(const base::FilePath& unpack_path) {
     21   const base::FilePath commands =
     22       unpack_path.Append(FILE_PATH_LITERAL("commands.json"));
     23   if (!base::PathExists(commands))
     24     return NULL;
     25 
     26   JSONFileValueSerializer serializer(commands);
     27   scoped_ptr<base::Value> root(serializer.Deserialize(NULL, NULL));
     28 
     29   return (root.get() && root->IsType(base::Value::TYPE_LIST)) ?
     30       static_cast<base::ListValue*>(root.release()) : NULL;
     31 }
     32 
     33 }  // namespace
     34 
     35 
     36 // The patching support is not cross-platform at the moment.
     37 ComponentPatcherCrossPlatform::ComponentPatcherCrossPlatform() {}
     38 
     39 ComponentUnpacker::Error ComponentPatcherCrossPlatform::Patch(
     40     PatchType patch_type,
     41     const base::FilePath& input_file,
     42     const base::FilePath& patch_file,
     43     const base::FilePath& output_file,
     44     int* error) {
     45   return ComponentUnpacker::kDeltaUnsupportedCommand;
     46 }
     47 
     48 
     49 // Takes the contents of a differential component update in input_dir
     50 // and produces the contents of a full component update in unpack_dir
     51 // using input_abs_path_ files that the installer knows about.
     52 ComponentUnpacker::Error DifferentialUpdatePatch(
     53     const base::FilePath& input_dir,
     54     const base::FilePath& unpack_dir,
     55     ComponentPatcher* patcher,
     56     ComponentInstaller* installer,
     57     int* error) {
     58   *error = 0;
     59   scoped_ptr<base::ListValue> commands(ReadCommands(input_dir));
     60   if (!commands.get())
     61     return ComponentUnpacker::kDeltaBadCommands;
     62 
     63   for (base::ValueVector::const_iterator command = commands->begin(),
     64       end = commands->end(); command != end; command++) {
     65     if (!(*command)->IsType(base::Value::TYPE_DICTIONARY))
     66       return ComponentUnpacker::kDeltaBadCommands;
     67     base::DictionaryValue* command_args =
     68         static_cast<base::DictionaryValue*>(*command);
     69     scoped_ptr<DeltaUpdateOp> operation(CreateDeltaUpdateOp(command_args));
     70     if (!operation)
     71       return ComponentUnpacker::kDeltaUnsupportedCommand;
     72 
     73     ComponentUnpacker::Error result = operation->Run(
     74         command_args, input_dir, unpack_dir, patcher, installer, error);
     75     if (result != ComponentUnpacker::kNone)
     76       return result;
     77   }
     78 
     79   return ComponentUnpacker::kNone;
     80 }
     81 
     82