extensions/common/features/json_feature_provider_source.cc

   1 // Copyright 2014 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 "extensions/common/features/json_feature_provider_source.h"
   6
   7 #include "base/json/json_reader.h"
   8 #include "base/logging.h"
   9 #include "ui/base/resource/resource_bundle.h"
  10
  11 namespace extensions {
  12
  13 JSONFeatureProviderSource::JSONFeatureProviderSource(const std::string& name)
  14     : name_(name) {
  15 }
  16
  17 JSONFeatureProviderSource::~JSONFeatureProviderSource() {
  18 }
  19
  20 void JSONFeatureProviderSource::LoadJSON(int resource_id) {
  21   const std::string& features_file = ResourceBundle::GetSharedInstance()
  22                                          .GetRawDataResource(resource_id)
  23                                          .as_string();
  24   int error_code = 0;
  25   std::string error_message;
  26   scoped_ptr<base::Value> value(base::JSONReader::ReadAndReturnError(
  27       features_file, base::JSON_PARSE_RFC, &error_code, &error_message));
  28   DCHECK(value) << "Could not load features: " << name_ << " " << error_message;
  29
  30   scoped_ptr<base::DictionaryValue> value_as_dict;
  31   if (value) {
  32     CHECK(value->IsType(base::Value::TYPE_DICTIONARY)) << name_;
  33     value_as_dict.reset(static_cast<base::DictionaryValue*>(value.release()));
  34   } else {
  35     // There was some error loading the features file.
  36     // http://crbug.com/176381
  37     value_as_dict.reset(new base::DictionaryValue());
  38   }
  39
  40   // Ensure there are no key collisions.
  41   for (base::DictionaryValue::Iterator iter(*value_as_dict); !iter.IsAtEnd();
  42        iter.Advance()) {
  43     if (dictionary_.GetWithoutPathExpansion(iter.key(), NULL))
  44       LOG(FATAL) << "Key " << iter.key() << " is defined in " << name_
  45                  << " JSON feature files more than once.";
  46   }
  47
  48   // Merge.
  49   dictionary_.MergeDictionary(value_as_dict.get());
  50 }
  51
  52 }  // namespace extensions