src/chrome/browser/component_updater/component_patcher.cc

   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