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// Copyright 2018 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 EXTENSIONS_BROWSER_JSON_FILE_SANITIZER_H_
#define EXTENSIONS_BROWSER_JSON_FILE_SANITIZER_H_
#include <memory>
#include <set>
#include <string>
#include <tuple>
#include "base/files/file_path.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/values.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "services/data_decoder/public/mojom/json_parser.mojom.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
namespace data_decoder {
class DataDecoder;
}
namespace extensions {
// This class takes potentially unsafe JSON files, decodes them in a sandboxed
// process, then reencodes them so that they can later be parsed safely from the
// browser process.
// Note that at this time it this is limited to JSON files that contain a
// unique dictionary as their root and will fail with a kDecodingError if that
// is not the case.
class JsonFileSanitizer {
public:
enum class Status {
kSuccess = 0,
kFileReadError,
kFileDeleteError,
kDecodingError,
kSerializingError,
kFileWriteError,
};
// Callback invoked when the JSON sanitization is is done. If status is an
// error, |error_msg| contains the error message.
using Callback =
base::OnceCallback<void(Status status, const std::string& error_msg)>;
// Creates a JsonFileSanitizer and starts the sanitization of the JSON files
// in |file_paths|.
// |decoder| should be a DataDecoder which can be used to talk to a Data
// Decoder service instance. It must be live on the calling sequence and
// it is not retained beyond the extent of this call.
// |callback| is invoked asynchronously when all JSON files have been
// sanitized or if an error occurred.
// If the returned JsonFileSanitizer instance is deleted before |callback| was
// invoked, then |callback| is never invoked and the sanitization stops
// promptly (some background tasks may still run).
static std::unique_ptr<JsonFileSanitizer> CreateAndStart(
data_decoder::DataDecoder* decoder,
const std::set<base::FilePath>& file_paths,
Callback callback,
const scoped_refptr<base::SequencedTaskRunner>& io_task_runner);
~JsonFileSanitizer();
private:
JsonFileSanitizer(
const std::set<base::FilePath>& file_paths,
Callback callback,
const scoped_refptr<base::SequencedTaskRunner>& io_task_runner);
void Start(data_decoder::DataDecoder* decoder);
void JsonFileRead(const base::FilePath& file_path,
std::tuple<std::string, bool, bool> read_and_delete_result);
void JsonParsingDone(const base::FilePath& file_path,
absl::optional<base::Value> json_value,
const absl::optional<std::string>& error);
void JsonFileWritten(const base::FilePath& file_path,
int expected_size,
int actual_size);
void ReportSuccess();
void ReportError(Status status, const std::string& path);
std::set<base::FilePath> file_paths_;
Callback callback_;
scoped_refptr<base::SequencedTaskRunner> io_task_runner_;
mojo::Remote<data_decoder::mojom::JsonParser> json_parser_;
base::WeakPtrFactory<JsonFileSanitizer> weak_factory_{this};
DISALLOW_COPY_AND_ASSIGN(JsonFileSanitizer);
};
} // namespace extensions
#endif // EXTENSIONS_BROWSER_JSON_FILE_SANITIZER_H_
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