1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
// 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/task/sequenced_task_runner.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::optional<std::vector<uint8_t>> result);
void ImageWritten(const base::FilePath& image_path, bool success);
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_
|
