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// Copyright 2018 The Chromium Authors
// 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/memory/weak_ptr.h"
#include "base/time/time.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,
};
class Client : public base::RefCountedThreadSafe<Client> {
public:
// Asks the client for a DataDecoder. Pushing the ownership of the
// DataDecoder to Client implementations help ensure that the same decoder
// can be reused across different decoding kinds (including non-image
// decoding).
virtual data_decoder::DataDecoder* GetDataDecoder() = 0;
// Callback invoked exactly once - when the image sanitization is done. If
// status is an error, |path| points to the file that caused the error.
virtual void OnImageSanitizationDone(Status status,
const base::FilePath& path) = 0;
// Callback invoked on a background thread 0..N times (once per image from
// `image_relative_paths`) whenever an image has been successfully decoded.
virtual void OnImageDecoded(const base::FilePath& path, SkBitmap image) = 0;
protected:
friend class base::RefCountedThreadSafe<Client>;
virtual ~Client();
};
// 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|.
//
// |client| provides the DataDecoder to use for image decoding. |client|'s
// OnImageDecoded and OnImageSanitizationDone methods will be called with
// sanitization results (if the returned ImageSanitizer instance is deleted
// then these callback methods are not called and the sanitization stops
// promptly (some background tasks may still run)).
static std::unique_ptr<ImageSanitizer> CreateAndStart(
scoped_refptr<Client> client,
const base::FilePath& image_dir,
const std::set<base::FilePath>& image_relative_paths,
const scoped_refptr<base::SequencedTaskRunner>& task_runner);
ImageSanitizer(const ImageSanitizer&) = delete;
ImageSanitizer& operator=(const ImageSanitizer&) = delete;
~ImageSanitizer();
private:
ImageSanitizer(
scoped_refptr<Client> client,
const base::FilePath& image_dir,
const std::set<base::FilePath>& image_relative_paths,
const scoped_refptr<base::SequencedTaskRunner>& io_task_runner);
void Start();
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_;
scoped_refptr<Client> client_;
scoped_refptr<base::SequencedTaskRunner> io_task_runner_;
base::WeakPtrFactory<ImageSanitizer> weak_factory_{this};
};
} // namespace extensions
#endif // EXTENSIONS_BROWSER_IMAGE_SANITIZER_H_
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