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 component_updater {
  17
  18 namespace {
  19
  20 // Deserialize the commands file (present in delta update packages). The top
  21 // level must be a list.
  22 base::ListValue* ReadCommands(const base::FilePath& unpack_path) {
  23   const base::FilePath commands =
  24       unpack_path.Append(FILE_PATH_LITERAL("commands.json"));
  25   if (!base::PathExists(commands))
  26     return NULL;
  27
  28   JSONFileValueSerializer serializer(commands);
  29   scoped_ptr<base::Value> root(serializer.Deserialize(NULL, NULL));
  30
  31   return (root.get() && root->IsType(base::Value::TYPE_LIST)) ?
  32       static_cast<base::ListValue*>(root.release()) : NULL;
  33 }
  34
  35 }  // namespace
  36
  37
  38 // The patching support is not cross-platform at the moment.
  39 ComponentPatcherCrossPlatform::ComponentPatcherCrossPlatform() {}
  40
  41 ComponentUnpacker::Error ComponentPatcherCrossPlatform::Patch(
  42     PatchType patch_type,
  43     const base::FilePath& input_file,
  44     const base::FilePath& patch_file,
  45     const base::FilePath& output_file,
  46     int* error) {
  47   return ComponentUnpacker::kDeltaUnsupportedCommand;
  48 }
  49
  50
  51 // Takes the contents of a differential component update in input_dir
  52 // and produces the contents of a full component update in unpack_dir
  53 // using input_abs_path_ files that the installer knows about.
  54 ComponentUnpacker::Error DifferentialUpdatePatch(
  55     const base::FilePath& input_dir,
  56     const base::FilePath& unpack_dir,
  57     ComponentPatcher* patcher,
  58     ComponentInstaller* installer,
  59     int* error) {
  60   *error = 0;
  61   scoped_ptr<base::ListValue> commands(ReadCommands(input_dir));
  62   if (!commands.get())
  63     return ComponentUnpacker::kDeltaBadCommands;
  64
  65   for (base::ValueVector::const_iterator command = commands->begin(),
  66       end = commands->end(); command != end; command++) {
  67     if (!(*command)->IsType(base::Value::TYPE_DICTIONARY))
  68       return ComponentUnpacker::kDeltaBadCommands;
  69     base::DictionaryValue* command_args =
  70         static_cast<base::DictionaryValue*>(*command);
  71     scoped_ptr<DeltaUpdateOp> operation(CreateDeltaUpdateOp(command_args));
  72     if (!operation)
  73       return ComponentUnpacker::kDeltaUnsupportedCommand;
  74
  75     ComponentUnpacker::Error result = operation->Run(
  76         command_args, input_dir, unpack_dir, patcher, installer, error);
  77     if (result != ComponentUnpacker::kNone)
  78       return result;
  79   }
  80
  81   return ComponentUnpacker::kNone;
  82 }
  83
  84 }  // namespace component_updater
  85