components/safe_json/safe_json_parser.h

// 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.

#ifndef COMPONENTS_SAFE_JSON_SAFE_JSON_PARSER_H_
#define COMPONENTS_SAFE_JSON_SAFE_JSON_PARSER_H_

#include <memory>
#include <string>

#include "base/callback.h"

namespace base {
class Value;
}

namespace safe_json {

// SafeJsonParser parses a given JSON safely via a platform-dependent mechanism
// (like parsing it in a utility process or in a memory-safe environment).
// Internally, an instance of this class is created when Parse() is called and
// is kept alive until one of the two callbacks is called, after which it
// deletes itself.
class SafeJsonParser {
 public:
  using SuccessCallback = base::Callback<void(std::unique_ptr<base::Value>)>;
  using ErrorCallback = base::Callback<void(const std::string&)>;

  using Factory = SafeJsonParser* (*)(const std::string& unsafe_json,
                                      const SuccessCallback& success_callback,
                                      const ErrorCallback& error_callback);

  // Starts parsing the passed in |unsafe_json| and calls either
  // |success_callback| or |error_callback| when finished.
  static void Parse(const std::string& unsafe_json,
                    const SuccessCallback& success_callback,
                    const ErrorCallback& error_callback);

  static void SetFactoryForTesting(Factory factory);

 protected:
  virtual ~SafeJsonParser() {}

 private:
  virtual void Start() = 0;
};

}  // namespace safe_json

#endif  // COMPONENTS_SAFE_JSON_SAFE_JSON_PARSER_H_