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
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/modules/mediasession/media_metadata_sanitizer.h"
#include "third_party/blink/public/mojom/mediasession/media_session.mojom-blink.h"
#include "third_party/blink/public/platform/web_icon_sizes_parser.h"
#include "third_party/blink/public/platform/web_string.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_media_image.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/core/inspector/console_message.h"
#include "third_party/blink/renderer/modules/mediasession/chapter_information.h"
#include "third_party/blink/renderer/modules/mediasession/media_metadata.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/wtf/text/string_operators.h"
#include "url/url_constants.h"
namespace blink {
namespace {
// Constants used by the sanitizer, must be consistent with
// content::MediaMetdataSanitizer.
// Maximum length of all strings inside MediaMetadata when it is sent over mojo.
const size_t kMaxStringLength = 4 * 1024;
// Maximum type length of MediaImage, which conforms to RFC 4288
// (https://tools.ietf.org/html/rfc4288).
const size_t kMaxImageTypeLength = 2 * 127 + 1;
// Maximum number of MediaImages inside the MediaMetadata.
const size_t kMaxNumberOfMediaImages = 10;
// Maximum number of `ChapterInformation` inside the `MediaMetadata`.
const size_t kMaxNumberOfChapters = 200;
// Maximum of sizes in a MediaImage.
const size_t kMaxNumberOfImageSizes = 10;
bool CheckMediaImageSrcSanity(const KURL& src, ExecutionContext* context) {
// Invalid URLs will be rejected early on.
DCHECK(src.IsValid());
if (!src.ProtocolIs(url::kHttpScheme) && !src.ProtocolIs(url::kHttpsScheme) &&
!src.ProtocolIs(url::kDataScheme) && !src.ProtocolIs(url::kBlobScheme)) {
context->AddConsoleMessage(MakeGarbageCollected<ConsoleMessage>(
mojom::ConsoleMessageSource::kJavaScript,
mojom::ConsoleMessageLevel::kWarning,
"MediaImage src can only be of http/https/data/blob scheme: " +
src.GetString()));
return false;
}
DCHECK(src.GetString().Is8Bit());
if (src.GetString().length() > url::kMaxURLChars) {
context->AddConsoleMessage(MakeGarbageCollected<ConsoleMessage>(
mojom::ConsoleMessageSource::kJavaScript,
mojom::ConsoleMessageLevel::kWarning,
"MediaImage src exceeds maximum URL length: " + src.GetString()));
return false;
}
return true;
}
// Sanitize MediaImage and do mojo serialization. Returns null when
// |image.src()| is bad.
media_session::mojom::blink::MediaImagePtr SanitizeMediaImageAndConvertToMojo(
const MediaImage* image,
ExecutionContext* context) {
media_session::mojom::blink::MediaImagePtr mojo_image;
KURL url = KURL(image->src());
if (!CheckMediaImageSrcSanity(url, context))
return mojo_image;
mojo_image = media_session::mojom::blink::MediaImage::New();
mojo_image->src = url;
mojo_image->type = image->type().Left(kMaxImageTypeLength);
for (const auto& web_size :
WebIconSizesParser::ParseIconSizes(image->sizes())) {
mojo_image->sizes.push_back(web_size);
if (mojo_image->sizes.size() == kMaxNumberOfImageSizes) {
context->AddConsoleMessage(MakeGarbageCollected<ConsoleMessage>(
mojom::ConsoleMessageSource::kJavaScript,
mojom::ConsoleMessageLevel::kWarning,
"The number of MediaImage sizes exceeds the upper limit. "
"All remaining MediaImage will be ignored"));
break;
}
}
return mojo_image;
}
// Sanitize ChapterInformation and do mojo serialization.
media_session::mojom::blink::ChapterInformationPtr
SanitizeChapterInformationAndConvertToMojo(const ChapterInformation* chapter,
ExecutionContext* context) {
media_session::mojom::blink::ChapterInformationPtr mojo_chapter;
if (!chapter) {
return mojo_chapter;
}
mojo_chapter = media_session::mojom::blink::ChapterInformation::New();
mojo_chapter->title = chapter->title().Left(kMaxStringLength);
mojo_chapter->startTime = base::Seconds(chapter->startTime());
for (const MediaImage* image : chapter->artwork()) {
media_session::mojom::blink::MediaImagePtr mojo_image =
SanitizeMediaImageAndConvertToMojo(image, context);
if (!mojo_image.is_null()) {
mojo_chapter->artwork.push_back(std::move(mojo_image));
}
if (mojo_chapter->artwork.size() == kMaxNumberOfMediaImages) {
context->AddConsoleMessage(MakeGarbageCollected<ConsoleMessage>(
mojom::ConsoleMessageSource::kJavaScript,
mojom::ConsoleMessageLevel::kWarning,
"The number of MediaImage sizes exceeds the upper limit in a "
"chapter. All remaining MediaImage will be ignored"));
break;
}
}
return mojo_chapter;
}
} // anonymous namespace
blink::mojom::blink::SpecMediaMetadataPtr
MediaMetadataSanitizer::SanitizeAndConvertToMojo(const MediaMetadata* metadata,
ExecutionContext* context) {
if (!metadata)
return blink::mojom::blink::SpecMediaMetadataPtr();
blink::mojom::blink::SpecMediaMetadataPtr mojo_metadata(
blink::mojom::blink::SpecMediaMetadata::New());
mojo_metadata->title = metadata->title().Left(kMaxStringLength);
mojo_metadata->artist = metadata->artist().Left(kMaxStringLength);
mojo_metadata->album = metadata->album().Left(kMaxStringLength);
for (const MediaImage* image : metadata->artwork()) {
media_session::mojom::blink::MediaImagePtr mojo_image =
SanitizeMediaImageAndConvertToMojo(image, context);
if (!mojo_image.is_null())
mojo_metadata->artwork.push_back(std::move(mojo_image));
if (mojo_metadata->artwork.size() == kMaxNumberOfMediaImages) {
context->AddConsoleMessage(MakeGarbageCollected<ConsoleMessage>(
mojom::ConsoleMessageSource::kJavaScript,
mojom::ConsoleMessageLevel::kWarning,
"The number of MediaImage sizes exceeds the upper limit. "
"All remaining MediaImage will be ignored"));
break;
}
}
if (!RuntimeEnabledFeatures::MediaSessionChapterInformationEnabled()) {
return mojo_metadata;
}
for (const ChapterInformation* chapter : metadata->chapterInfo()) {
media_session::mojom::blink::ChapterInformationPtr mojo_chapter =
SanitizeChapterInformationAndConvertToMojo(chapter, context);
if (!mojo_chapter.is_null()) {
mojo_metadata->chapterInfo.push_back(std::move(mojo_chapter));
}
if (mojo_metadata->chapterInfo.size() == kMaxNumberOfChapters) {
context->AddConsoleMessage(MakeGarbageCollected<ConsoleMessage>(
mojom::ConsoleMessageSource::kJavaScript,
mojom::ConsoleMessageLevel::kWarning,
"The number of ChapterInformation sizes exceeds the upper limit. "
"All remaining ChapterInformation will be ignored"));
break;
}
}
return mojo_metadata;
}
} // namespace blink
|
