// Copyright 2013 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.

#include "chrome/common/extensions/manifest_handlers/nacl_modules_handler.h"

#include "base/lazy_instance.h"
#include "base/memory/scoped_ptr.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/utf_string_conversions.h"
#include "base/values.h"
#include "chrome/common/extensions/extension_manifest_constants.h"
#include "extensions/common/error_utils.h"

namespace extensions {

namespace keys = extensions::manifest_keys;
namespace errors = extension_manifest_errors;

namespace {

struct NaClModuleData : Extension::ManifestData {
  // Optional list of NaCl modules and associated properties.
  NaClModuleInfo::List nacl_modules_;
};

}  // namespace

// static
const NaClModuleInfo::List* NaClModuleInfo::GetNaClModules(
    const Extension* extension) {
  NaClModuleData* data = static_cast<NaClModuleData*>(
      extension->GetManifestData(keys::kNaClModules));
  return data ? &data->nacl_modules_ : NULL;
}

NaClModulesHandler::NaClModulesHandler() {
}

NaClModulesHandler::~NaClModulesHandler() {
}

bool NaClModulesHandler::Parse(Extension* extension,
                               string16* error) {
  const base::ListValue* list_value = NULL;
  if (!extension->manifest()->GetList(keys::kNaClModules, &list_value)) {
    *error = ASCIIToUTF16(errors::kInvalidNaClModules);
    return false;
  }

  scoped_ptr<NaClModuleData> nacl_module_data(new NaClModuleData);

  for (size_t i = 0; i < list_value->GetSize(); ++i) {
    const base::DictionaryValue* module_value = NULL;
    if (!list_value->GetDictionary(i, &module_value)) {
      *error = ASCIIToUTF16(errors::kInvalidNaClModules);
      return false;
    }

    // Get nacl_modules[i].path.
    std::string path_str;
    if (!module_value->GetString(keys::kNaClModulesPath, &path_str)) {
      *error = ErrorUtils::FormatErrorMessageUTF16(
          errors::kInvalidNaClModulesPath, base::IntToString(i));
      return false;
    }

    // Get nacl_modules[i].mime_type.
    std::string mime_type;
    if (!module_value->GetString(keys::kNaClModulesMIMEType, &mime_type)) {
      *error = ErrorUtils::FormatErrorMessageUTF16(
          errors::kInvalidNaClModulesMIMEType, base::IntToString(i));
      return false;
    }

    nacl_module_data->nacl_modules_.push_back(NaClModuleInfo());
    nacl_module_data->nacl_modules_.back().url =
        extension->GetResourceURL(path_str);
    nacl_module_data->nacl_modules_.back().mime_type = mime_type;
  }

  extension->SetManifestData(keys::kNaClModules, nacl_module_data.release());
  return true;
}

const std::vector<std::string> NaClModulesHandler::Keys() const {
  return SingleKey(keys::kNaClModules);
}

}  // namespace extensions