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
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
content / browser / android / content_url_loader_factory.cc [blame]
// 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.
#include "content/browser/android/content_url_loader_factory.h"
#include <limits>
#include <string>
#include <vector>
#include "base/android/content_uri_utils.h"
#include "base/command_line.h"
#include "base/files/file.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool.h"
#include "base/time/time.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/browser/file_url_loader.h"
#include "content/public/common/content_client.h"
#include "content/public/common/content_switches.h"
#include "mojo/public/cpp/bindings/receiver.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "mojo/public/cpp/system/data_pipe.h"
#include "mojo/public/cpp/system/data_pipe_producer.h"
#include "mojo/public/cpp/system/file_data_source.h"
#include "mojo/public/cpp/system/file_stream_data_source.h"
#include "net/base/net_errors.h"
#include "net/http/http_byte_range.h"
#include "net/http/http_util.h"
#include "services/network/public/cpp/cors/cors.h"
#include "services/network/public/cpp/resource_request.h"
#include "services/network/public/mojom/url_loader.mojom.h"
#include "services/network/public/mojom/url_response_head.mojom.h"
#include "third_party/blink/public/mojom/loader/resource_load_info.mojom-shared.h"
// TODO(eroman): Add unit-tests for "X-Chrome-intent-type"
// (see url_request_content_job_unittest.cc).
// TODO(eroman): Remove duplication with file_url_loader_factory.cc (notably
// Range header parsing).
namespace content {
namespace {
constexpr size_t kDefaultContentUrlPipeSize = 65536;
// Assigns the byte range that has been requested based on the Range header.
// This assumes the simplest form of the Range header using a single range.
// If no byte range was specified, the output range will cover the entire file.
bool GetRequestedByteRange(const network::ResourceRequest& request,
uint64_t content_size,
uint64_t* first_byte_to_send,
uint64_t* total_bytes_to_send) {
*first_byte_to_send = 0;
*total_bytes_to_send = content_size;
std::optional<std::string> range_header =
request.headers.GetHeader(net::HttpRequestHeaders::kRange);
std::vector<net::HttpByteRange> ranges;
if (!range_header ||
!net::HttpUtil::ParseRangeHeader(*range_header, &ranges)) {
return true;
}
// Only handle a simple Range header for a single range.
if (ranges.size() != 1 || !ranges[0].IsValid() ||
!ranges[0].ComputeBounds(content_size)) {
return false;
}
net::HttpByteRange byte_range = ranges[0];
*first_byte_to_send = byte_range.first_byte_position();
*total_bytes_to_send =
byte_range.last_byte_position() - *first_byte_to_send + 1;
return true;
}
// Gets the mimetype for |content_path| either by asking the content provider,
// or by using the special Chrome request header X-Chrome-intent-type.
void GetMimeType(const network::ResourceRequest& request,
const base::FilePath& content_path,
std::string* out_mime_type) {
out_mime_type->clear();
if (request.resource_type ==
static_cast<int>(blink::mojom::ResourceType::kMainFrame)) {
std::optional<std::string> intent_type_header =
request.headers.GetHeader("X-Chrome-intent-type");
if (intent_type_header) {
*out_mime_type = std::move(intent_type_header).value();
}
}
if (out_mime_type->empty())
*out_mime_type = base::GetContentUriMimeType(content_path);
}
class ContentURLLoader : public network::mojom::URLLoader {
public:
static void CreateAndStart(
const network::ResourceRequest& request,
mojo::PendingReceiver<network::mojom::URLLoader> loader,
mojo::PendingRemote<network::mojom::URLLoaderClient> client_remote) {
// Owns itself. Will live as long as its URLLoader and URLLoaderClient
// bindings are alive - essentially until either the client gives up or all
// file data has been sent to it.
auto* content_url_loader = new ContentURLLoader;
content_url_loader->Start(request, std::move(loader),
std::move(client_remote));
}
ContentURLLoader(const ContentURLLoader&) = delete;
ContentURLLoader& operator=(const ContentURLLoader&) = delete;
// network::mojom::URLLoader:
void FollowRedirect(
const std::vector<std::string>& removed_headers,
const net::HttpRequestHeaders& modified_headers,
const net::HttpRequestHeaders& modified_cors_exempt_headers,
const std::optional<GURL>& new_url) override {}
void SetPriority(net::RequestPriority priority,
int32_t intra_priority_value) override {}
void PauseReadingBodyFromNet() override {}
void ResumeReadingBodyFromNet() override {}
private:
ContentURLLoader() = default;
~ContentURLLoader() override = default;
void Start(
const network::ResourceRequest& request,
mojo::PendingReceiver<network::mojom::URLLoader> loader,
mojo::PendingRemote<network::mojom::URLLoaderClient> client_remote) {
bool disable_web_security =
base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kDisableWebSecurity);
network::mojom::FetchResponseType response_type =
network::cors::CalculateResponseType(request.mode,
disable_web_security);
// Don't allow content:// requests with kSameOrigin or kCors* unless the
// web security is turned off.
if ((!disable_web_security &&
request.mode == network::mojom::RequestMode::kSameOrigin) ||
response_type == network::mojom::FetchResponseType::kCors) {
mojo::Remote<network::mojom::URLLoaderClient>(std::move(client_remote))
->OnComplete(
network::URLLoaderCompletionStatus(network::CorsErrorStatus(
network::mojom::CorsError::kCorsDisabledScheme)));
return;
}
auto head = network::mojom::URLResponseHead::New();
head->request_start = head->response_start = base::TimeTicks::Now();
head->response_type = response_type;
receiver_.Bind(std::move(loader));
receiver_.set_disconnect_handler(base::BindOnce(
&ContentURLLoader::OnMojoDisconnect, base::Unretained(this)));
mojo::Remote<network::mojom::URLLoaderClient> client(
std::move(client_remote));
DCHECK(request.url.SchemeIs("content"));
base::FilePath path = base::FilePath(request.url.spec());
// Get the file length.
base::File::Info info;
if (!base::GetFileInfo(path, &info))
return CompleteWithFailure(std::move(client), net::ERR_FILE_NOT_FOUND);
uint64_t first_byte_to_send;
uint64_t total_bytes_to_send;
if (!GetRequestedByteRange(request, (info.size > 0) ? info.size : 0,
&first_byte_to_send, &total_bytes_to_send) ||
(std::numeric_limits<int64_t>::max() < first_byte_to_send) ||
(std::numeric_limits<int64_t>::max() < total_bytes_to_send)) {
return CompleteWithFailure(std::move(client),
net::ERR_REQUEST_RANGE_NOT_SATISFIABLE);
}
mojo::ScopedDataPipeProducerHandle producer_handle;
mojo::ScopedDataPipeConsumerHandle consumer_handle;
if (mojo::CreateDataPipe(kDefaultContentUrlPipeSize, producer_handle,
consumer_handle) != MOJO_RESULT_OK) {
return CompleteWithFailure(std::move(client), net::ERR_FAILED);
}
base::File file(path, base::File::FLAG_OPEN | base::File::FLAG_READ);
if (!file.IsValid()) {
return CompleteWithFailure(
std::move(client), net::FileErrorToNetError(file.error_details()));
}
head->content_length = total_bytes_to_send;
total_bytes_written_ = total_bytes_to_send;
// Set the mimetype of the response.
GetMimeType(request, path, &head->mime_type);
if (!head->mime_type.empty()) {
head->headers = base::MakeRefCounted<net::HttpResponseHeaders>("");
head->headers->SetHeader(net::HttpRequestHeaders::kContentType,
head->mime_type);
}
client->OnReceiveResponse(std::move(head), std::move(consumer_handle),
std::nullopt);
client_ = std::move(client);
if (total_bytes_to_send == 0) {
// There's no more data, so we're already done.
OnFileWritten(MOJO_RESULT_OK);
return;
}
// Content-URIs backed by local files usually support range requests using
// seek(), but not all do, so we prefer to use FileStreamDataSource.
std::unique_ptr<mojo::DataPipeProducer::DataSource> data_source;
if (first_byte_to_send == 0 &&
total_bytes_to_send == static_cast<uint64_t>(info.size)) {
data_source = std::make_unique<mojo::FileStreamDataSource>(
std::move(file), info.size);
} else {
auto file_data_source =
std::make_unique<mojo::FileDataSource>(std::move(file));
file_data_source->SetRange(first_byte_to_send,
first_byte_to_send + total_bytes_to_send);
data_source = std::move(file_data_source);
}
data_producer_ =
std::make_unique<mojo::DataPipeProducer>(std::move(producer_handle));
data_producer_->Write(std::move(data_source),
base::BindOnce(&ContentURLLoader::OnFileWritten,
base::Unretained(this)));
}
void CompleteWithFailure(mojo::Remote<network::mojom::URLLoaderClient> client,
net::Error net_error) {
client->OnComplete(network::URLLoaderCompletionStatus(net_error));
MaybeDeleteSelf();
}
void OnMojoDisconnect() {
receiver_.reset();
MaybeDeleteSelf();
}
void MaybeDeleteSelf() {
if (!receiver_.is_bound() && !client_.is_bound())
delete this;
}
void OnFileWritten(MojoResult result) {
// All the data has been written now. Close the data pipe. The consumer will
// be notified that there will be no more data to read from now.
data_producer_.reset();
if (result == MOJO_RESULT_OK) {
network::URLLoaderCompletionStatus status(net::OK);
status.encoded_data_length = total_bytes_written_;
status.encoded_body_length = total_bytes_written_;
status.decoded_body_length = total_bytes_written_;
client_->OnComplete(status);
} else {
client_->OnComplete(network::URLLoaderCompletionStatus(net::ERR_FAILED));
}
client_.reset();
MaybeDeleteSelf();
}
std::unique_ptr<mojo::DataPipeProducer> data_producer_;
mojo::Receiver<network::mojom::URLLoader> receiver_{this};
mojo::Remote<network::mojom::URLLoaderClient> client_;
// In case of successful loads, this holds the total of bytes written.
// It is used to set some of the URLLoaderCompletionStatus data passed back
// to the URLLoaderClients (eg SimpleURLLoader).
size_t total_bytes_written_ = 0;
};
} // namespace
ContentURLLoaderFactory::ContentURLLoaderFactory(
scoped_refptr<base::SequencedTaskRunner> task_runner,
mojo::PendingReceiver<network::mojom::URLLoaderFactory> factory_receiver)
: network::SelfDeletingURLLoaderFactory(std::move(factory_receiver)),
task_runner_(std::move(task_runner)) {}
ContentURLLoaderFactory::~ContentURLLoaderFactory() = default;
void ContentURLLoaderFactory::CreateLoaderAndStart(
mojo::PendingReceiver<network::mojom::URLLoader> loader,
int32_t request_id,
uint32_t options,
const network::ResourceRequest& request,
mojo::PendingRemote<network::mojom::URLLoaderClient> client,
const net::MutableNetworkTrafficAnnotationTag& traffic_annotation) {
task_runner_->PostTask(
FROM_HERE, base::BindOnce(&ContentURLLoader::CreateAndStart, request,
std::move(loader), std::move(client)));
}
// static
mojo::PendingRemote<network::mojom::URLLoaderFactory>
ContentURLLoaderFactory::Create() {
mojo::PendingRemote<network::mojom::URLLoaderFactory> pending_remote;
// The ContentURLLoaderFactory will delete itself when there are no more
// receivers - see the network::SelfDeletingURLLoaderFactory::OnDisconnect
// method.
new ContentURLLoaderFactory(
base::ThreadPool::CreateSequencedTaskRunner(
{base::MayBlock(), base::TaskPriority::BEST_EFFORT,
base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN}),
pending_remote.InitWithNewPipeAndPassReceiver());
return pending_remote;
}
} // namespace content