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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.
#include <cstdint>
#include <memory>
#include <set>
#include <tuple>
#include <vector>
#include "base/files/file_path.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/values.h"
#include "services/data_decoder/public/mojom/image_decoder.mojom.h"
#include "services/service_manager/public/cpp/service_filter.h"
class SkBitmap;
namespace service_manager {
class Connector;
namespace extensions {
// This class takes potentially unsafe images and decodes them in a sandboxed
// process, then reencodes them so that they can later be safely used in the
// browser process.
class ImageSanitizer {
enum class Status {
kSuccess = 0,
kServiceError, // The data-decoder service crashed.
// Callback invoked when the image sanitization is is done. If status is an
// error, |path| points to the file that caused the error.
using SanitizationDoneCallback =
base::OnceCallback<void(Status status, const base::FilePath& path)>;
// Called on a background thread when an image has been decoded.
using ImageDecodedCallback =
base::RepeatingCallback<void(const base::FilePath& path, SkBitmap image)>;
// Creates an ImageSanitizer and starts the sanitization of the images in
// |image_relative_paths|. These paths should be relative and not reference
// their parent dir or an kImagePathError will be reported to |done_callback|.
// These relative paths are resolved against |image_dir|.
// |connector| should be a connector to the ServiceManager usable on the
// current thread. |service_filter| is used when accessing the data decoder
// service which is used internally to decode images. It lets callers
// potentially share a process when doing unrelated data decoding operations.
// |done_callback| is invoked asynchronously when all images have been
// sanitized or if an error occurred.
// If the returned ImageSanitizer instance is deleted, |done_callback| and
// |image_decoded_callback| are not called and the sanitization stops promptly
// (some background tasks may still run).
static std::unique_ptr<ImageSanitizer> CreateAndStart(
service_manager::Connector* connector,
const service_manager::ServiceFilter& service_filter,
const base::FilePath& image_dir,
const std::set<base::FilePath>& image_relative_paths,
ImageDecodedCallback image_decoded_callback,
SanitizationDoneCallback done_callback);
ImageSanitizer(const base::FilePath& image_dir,
const std::set<base::FilePath>& image_relative_paths,
ImageDecodedCallback image_decoded_callback,
SanitizationDoneCallback done_callback);
void Start(service_manager::Connector* connector,
const service_manager::ServiceFilter& service_filter);
void ImageFileRead(
const base::FilePath& image_path,
std::tuple<std::vector<uint8_t>, bool, bool> read_and_delete_result);
void ImageDecoded(const base::FilePath& image_path,
const SkBitmap& decoded_image);
void ImageReencoded(const base::FilePath& image_path,
std::pair<bool, std::vector<unsigned char>> result);
void ImageWritten(const base::FilePath& image_path,
int expected_size,
int actual_size);
void ReportSuccess();
void ReportError(Status status, const base::FilePath& path);
void CleanUp();
base::FilePath image_dir_;
std::set<base::FilePath> image_paths_;
ImageDecodedCallback image_decoded_callback_;
SanitizationDoneCallback done_callback_;
data_decoder::mojom::ImageDecoderPtr image_decoder_ptr_;
base::WeakPtrFactory<ImageSanitizer> weak_factory_;
} // namespace extensions