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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_IMAGE_SANITIZER_H_
#define EXTENSIONS_BROWSER_IMAGE_SANITIZER_H_
#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 "mojo/public/cpp/bindings/remote.h"
#include "services/data_decoder/public/mojom/image_decoder.mojom.h"
class SkBitmap;
namespace data_decoder {
class DataDecoder;
}
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 {
public:
enum class Status {
kSuccess = 0,
kImagePathError,
kFileReadError,
kFileDeleteError,
kDecodingError,
kEncodingError,
kFileWriteError,
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|.
// |decoder| should be a DataDecoder instance to use for image decoding.
// |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(
data_decoder::DataDecoder* decoder,
const base::FilePath& image_dir,
const std::set<base::FilePath>& image_relative_paths,
ImageDecodedCallback image_decoded_callback,
SanitizationDoneCallback done_callback,
const scoped_refptr<base::SequencedTaskRunner>& task_runner);
~ImageSanitizer();
private:
ImageSanitizer(
const base::FilePath& image_dir,
const std::set<base::FilePath>& image_relative_paths,
ImageDecodedCallback image_decoded_callback,
SanitizationDoneCallback done_callback,
const scoped_refptr<base::SequencedTaskRunner>& io_task_runner);
void Start(data_decoder::DataDecoder* decoder);
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_;
scoped_refptr<base::SequencedTaskRunner> io_task_runner_;
mojo::Remote<data_decoder::mojom::ImageDecoder> image_decoder_;
base::WeakPtrFactory<ImageSanitizer> weak_factory_{this};
DISALLOW_COPY_AND_ASSIGN(ImageSanitizer);
};
} // namespace extensions
#endif // EXTENSIONS_BROWSER_IMAGE_SANITIZER_H_
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