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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 // The basic usage of the Filter interface is described in the comment at | 5 // The basic usage of the Filter interface is described in the comment at |
6 // the beginning of filter.h. If Filter::Factory is passed a vector of | 6 // the beginning of filter.h. If Filter::Factory is passed a vector of |
7 // size greater than 1, that interface is implemented by a series of filters | 7 // size greater than 1, that interface is implemented by a series of filters |
8 // connected in a chain. In such a case the first filter | 8 // connected in a chain. In such a case the first filter |
9 // in the chain proxies calls to ReadData() so that its return values | 9 // in the chain proxies calls to ReadData() so that its return values |
10 // apply to the entire chain. | 10 // apply to the entire chain. |
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21 // next filter needs it, a return value of FILTER_NEED_MORE_DATA from the | 21 // next filter needs it, a return value of FILTER_NEED_MORE_DATA from the |
22 // final filter will apply to the entire chain. | 22 // final filter will apply to the entire chain. |
23 | 23 |
24 #include "net/filter/filter.h" | 24 #include "net/filter/filter.h" |
25 | 25 |
26 #include "base/files/file_path.h" | 26 #include "base/files/file_path.h" |
27 #include "base/strings/string_util.h" | 27 #include "base/strings/string_util.h" |
28 #include "net/base/filename_util_unsafe.h" | 28 #include "net/base/filename_util_unsafe.h" |
29 #include "net/base/io_buffer.h" | 29 #include "net/base/io_buffer.h" |
30 #include "net/base/mime_util.h" | 30 #include "net/base/mime_util.h" |
31 #include "net/base/sdch_net_log_params.h" | |
32 #include "net/filter/gzip_filter.h" | 31 #include "net/filter/gzip_filter.h" |
33 #include "net/filter/sdch_filter.h" | 32 #include "net/filter/sdch_filter.h" |
34 #include "net/url_request/url_request_context.h" | 33 #include "net/url_request/url_request_context.h" |
35 #include "url/gurl.h" | 34 #include "url/gurl.h" |
36 | 35 |
37 namespace net { | |
38 | |
39 namespace { | 36 namespace { |
40 | 37 |
41 // Filter types (using canonical lower case only): | 38 // Filter types (using canonical lower case only): |
42 const char kDeflate[] = "deflate"; | 39 const char kDeflate[] = "deflate"; |
43 const char kGZip[] = "gzip"; | 40 const char kGZip[] = "gzip"; |
44 const char kXGZip[] = "x-gzip"; | 41 const char kXGZip[] = "x-gzip"; |
45 const char kSdch[] = "sdch"; | 42 const char kSdch[] = "sdch"; |
46 // compress and x-compress are currently not supported. If we decide to support | 43 // compress and x-compress are currently not supported. If we decide to support |
47 // them, we'll need the same mime type compatibility hack we have for gzip. For | 44 // them, we'll need the same mime type compatibility hack we have for gzip. For |
48 // more information, see Firefox's nsHttpChannel::ProcessNormal. | 45 // more information, see Firefox's nsHttpChannel::ProcessNormal. |
49 | 46 |
50 // Mime types: | 47 // Mime types: |
51 const char kApplicationXGzip[] = "application/x-gzip"; | 48 const char kApplicationXGzip[] = "application/x-gzip"; |
52 const char kApplicationGzip[] = "application/gzip"; | 49 const char kApplicationGzip[] = "application/gzip"; |
53 const char kApplicationXGunzip[] = "application/x-gunzip"; | 50 const char kApplicationXGunzip[] = "application/x-gunzip"; |
54 const char kTextHtml[] = "text/html"; | 51 const char kTextHtml[] = "text/html"; |
55 | 52 |
56 // Buffer size allocated when de-compressing data. | 53 // Buffer size allocated when de-compressing data. |
57 const int kFilterBufSize = 32 * 1024; | 54 const int kFilterBufSize = 32 * 1024; |
58 | 55 |
59 void LogSdchProblem(const FilterContext& filter_context, | 56 } // namespace |
60 SdchProblemCode problem) { | |
61 SdchManager::SdchErrorRecovery(problem); | |
62 filter_context.GetNetLog().AddEvent( | |
63 NetLog::TYPE_SDCH_DECODING_ERROR, | |
64 base::Bind(&NetLogSdchResourceProblemCallback, problem)); | |
65 } | |
66 | 57 |
67 } // namespace | 58 namespace net { |
68 | 59 |
69 FilterContext::~FilterContext() { | 60 FilterContext::~FilterContext() { |
70 } | 61 } |
71 | 62 |
72 Filter::~Filter() {} | 63 Filter::~Filter() {} |
73 | 64 |
74 // static | 65 // static |
75 Filter* Filter::Factory(const std::vector<FilterType>& filter_types, | 66 Filter* Filter::Factory(const std::vector<FilterType>& filter_types, |
76 const FilterContext& filter_context) { | 67 const FilterContext& filter_context) { |
77 if (filter_types.empty()) | 68 if (filter_types.empty()) |
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235 !IsSupportedMimeType(mime_type)) | 226 !IsSupportedMimeType(mime_type)) |
236 encoding_types->clear(); | 227 encoding_types->clear(); |
237 } | 228 } |
238 } | 229 } |
239 | 230 |
240 // If the request was for SDCH content, then we might need additional fixups. | 231 // If the request was for SDCH content, then we might need additional fixups. |
241 if (!filter_context.SdchResponseExpected()) { | 232 if (!filter_context.SdchResponseExpected()) { |
242 // It was not an SDCH request, so we'll just record stats. | 233 // It was not an SDCH request, so we'll just record stats. |
243 if (1 < encoding_types->size()) { | 234 if (1 < encoding_types->size()) { |
244 // Multiple filters were intended to only be used for SDCH (thus far!) | 235 // Multiple filters were intended to only be used for SDCH (thus far!) |
245 LogSdchProblem(filter_context, SDCH_MULTIENCODING_FOR_NON_SDCH_REQUEST); | 236 SdchManager::SdchErrorRecovery( |
| 237 SdchManager::MULTIENCODING_FOR_NON_SDCH_REQUEST); |
246 } | 238 } |
247 if ((1 == encoding_types->size()) && | 239 if ((1 == encoding_types->size()) && |
248 (FILTER_TYPE_SDCH == encoding_types->front())) { | 240 (FILTER_TYPE_SDCH == encoding_types->front())) { |
249 LogSdchProblem(filter_context, | 241 SdchManager::SdchErrorRecovery( |
250 SDCH_SDCH_CONTENT_ENCODE_FOR_NON_SDCH_REQUEST); | 242 SdchManager::SDCH_CONTENT_ENCODE_FOR_NON_SDCH_REQUEST); |
251 } | 243 } |
252 return; | 244 return; |
253 } | 245 } |
254 | 246 |
255 // The request was tagged as an SDCH request, which means the server supplied | 247 // The request was tagged as an SDCH request, which means the server supplied |
256 // a dictionary, and we advertised it in the request. Some proxies will do | 248 // a dictionary, and we advertised it in the request. Some proxies will do |
257 // very strange things to the request, or the response, so we have to handle | 249 // very strange things to the request, or the response, so we have to handle |
258 // them gracefully. | 250 // them gracefully. |
259 | 251 |
260 // If content encoding included SDCH, then everything is "relatively" fine. | 252 // If content encoding included SDCH, then everything is "relatively" fine. |
261 if (!encoding_types->empty() && | 253 if (!encoding_types->empty() && |
262 (FILTER_TYPE_SDCH == encoding_types->front())) { | 254 (FILTER_TYPE_SDCH == encoding_types->front())) { |
263 // Some proxies (found currently in Argentina) strip the Content-Encoding | 255 // Some proxies (found currently in Argentina) strip the Content-Encoding |
264 // text from "sdch,gzip" to a mere "sdch" without modifying the compressed | 256 // text from "sdch,gzip" to a mere "sdch" without modifying the compressed |
265 // payload. To handle this gracefully, we simulate the "probably" deleted | 257 // payload. To handle this gracefully, we simulate the "probably" deleted |
266 // ",gzip" by appending a tentative gzip decode, which will default to a | 258 // ",gzip" by appending a tentative gzip decode, which will default to a |
267 // no-op pass through filter if it doesn't get gzip headers where expected. | 259 // no-op pass through filter if it doesn't get gzip headers where expected. |
268 if (1 == encoding_types->size()) { | 260 if (1 == encoding_types->size()) { |
269 encoding_types->push_back(FILTER_TYPE_GZIP_HELPING_SDCH); | 261 encoding_types->push_back(FILTER_TYPE_GZIP_HELPING_SDCH); |
270 LogSdchProblem(filter_context, SDCH_OPTIONAL_GUNZIP_ENCODING_ADDED); | 262 SdchManager::SdchErrorRecovery( |
| 263 SdchManager::OPTIONAL_GUNZIP_ENCODING_ADDED); |
271 } | 264 } |
272 return; | 265 return; |
273 } | 266 } |
274 | 267 |
275 // There are now several cases to handle for an SDCH request. Foremost, if | 268 // There are now several cases to handle for an SDCH request. Foremost, if |
276 // the outbound request was stripped so as not to advertise support for | 269 // the outbound request was stripped so as not to advertise support for |
277 // encodings, we might get back content with no encoding, or (for example) | 270 // encodings, we might get back content with no encoding, or (for example) |
278 // just gzip. We have to be sure that any changes we make allow for such | 271 // just gzip. We have to be sure that any changes we make allow for such |
279 // minimal coding to work. That issue is why we use TENTATIVE filters if we | 272 // minimal coding to work. That issue is why we use TENTATIVE filters if we |
280 // add any, as those filters sniff the content, and act as pass-through | 273 // add any, as those filters sniff the content, and act as pass-through |
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294 // The one unresolved failure mode comes when we advertise a dictionary, and | 287 // The one unresolved failure mode comes when we advertise a dictionary, and |
295 // the server tries to *send* a gzipped file (not gzip encode content), and | 288 // the server tries to *send* a gzipped file (not gzip encode content), and |
296 // then we could do a gzip decode :-(. Since SDCH is only (currently) | 289 // then we could do a gzip decode :-(. Since SDCH is only (currently) |
297 // supported server side on paths that only send HTML content, this mode has | 290 // supported server side on paths that only send HTML content, this mode has |
298 // never surfaced in the wild (and is unlikely to). | 291 // never surfaced in the wild (and is unlikely to). |
299 // We will gather a lot of stats as we perform the fixups | 292 // We will gather a lot of stats as we perform the fixups |
300 if (StartsWithASCII(mime_type, kTextHtml, false)) { | 293 if (StartsWithASCII(mime_type, kTextHtml, false)) { |
301 // Suspicious case: Advertised dictionary, but server didn't use sdch, and | 294 // Suspicious case: Advertised dictionary, but server didn't use sdch, and |
302 // we're HTML tagged. | 295 // we're HTML tagged. |
303 if (encoding_types->empty()) { | 296 if (encoding_types->empty()) { |
304 LogSdchProblem(filter_context, SDCH_ADDED_CONTENT_ENCODING); | 297 SdchManager::SdchErrorRecovery( |
| 298 SdchManager::ADDED_CONTENT_ENCODING); |
305 } else if (1 == encoding_types->size()) { | 299 } else if (1 == encoding_types->size()) { |
306 LogSdchProblem(filter_context, SDCH_FIXED_CONTENT_ENCODING); | 300 SdchManager::SdchErrorRecovery( |
| 301 SdchManager::FIXED_CONTENT_ENCODING); |
307 } else { | 302 } else { |
308 LogSdchProblem(filter_context, SDCH_FIXED_CONTENT_ENCODINGS); | 303 SdchManager::SdchErrorRecovery( |
| 304 SdchManager::FIXED_CONTENT_ENCODINGS); |
309 } | 305 } |
310 } else { | 306 } else { |
311 // Remarkable case!?! We advertised an SDCH dictionary, content-encoding | 307 // Remarkable case!?! We advertised an SDCH dictionary, content-encoding |
312 // was not marked for SDCH processing: Why did the server suggest an SDCH | 308 // was not marked for SDCH processing: Why did the server suggest an SDCH |
313 // dictionary in the first place??. Also, the content isn't | 309 // dictionary in the first place??. Also, the content isn't |
314 // tagged as HTML, despite the fact that SDCH encoding is mostly likely for | 310 // tagged as HTML, despite the fact that SDCH encoding is mostly likely for |
315 // HTML: Did some anti-virus system strip this tag (sometimes they strip | 311 // HTML: Did some anti-virus system strip this tag (sometimes they strip |
316 // accept-encoding headers on the request)?? Does the content encoding not | 312 // accept-encoding headers on the request)?? Does the content encoding not |
317 // start with "text/html" for some other reason?? We'll report this as a | 313 // start with "text/html" for some other reason?? We'll report this as a |
318 // fixup to a binary file, but it probably really is text/html (some how). | 314 // fixup to a binary file, but it probably really is text/html (some how). |
319 if (encoding_types->empty()) { | 315 if (encoding_types->empty()) { |
320 LogSdchProblem(filter_context, SDCH_BINARY_ADDED_CONTENT_ENCODING); | 316 SdchManager::SdchErrorRecovery( |
| 317 SdchManager::BINARY_ADDED_CONTENT_ENCODING); |
321 } else if (1 == encoding_types->size()) { | 318 } else if (1 == encoding_types->size()) { |
322 LogSdchProblem(filter_context, SDCH_BINARY_FIXED_CONTENT_ENCODING); | 319 SdchManager::SdchErrorRecovery( |
| 320 SdchManager::BINARY_FIXED_CONTENT_ENCODING); |
323 } else { | 321 } else { |
324 LogSdchProblem(filter_context, SDCH_BINARY_FIXED_CONTENT_ENCODINGS); | 322 SdchManager::SdchErrorRecovery( |
| 323 SdchManager::BINARY_FIXED_CONTENT_ENCODINGS); |
325 } | 324 } |
326 } | 325 } |
327 | 326 |
328 // Leave the existing encoding type to be processed first, and add our | 327 // Leave the existing encoding type to be processed first, and add our |
329 // tentative decodings to be done afterwards. Vodaphone UK reportedyl will | 328 // tentative decodings to be done afterwards. Vodaphone UK reportedyl will |
330 // perform a second layer of gzip encoding atop the server's sdch,gzip | 329 // perform a second layer of gzip encoding atop the server's sdch,gzip |
331 // encoding, and then claim that the content encoding is a mere gzip. As a | 330 // encoding, and then claim that the content encoding is a mere gzip. As a |
332 // result we'll need (in that case) to do the gunzip, plus our tentative | 331 // result we'll need (in that case) to do the gunzip, plus our tentative |
333 // gunzip and tentative SDCH decoding. | 332 // gunzip and tentative SDCH decoding. |
334 // This approach nicely handles the empty() list as well, and should work with | 333 // This approach nicely handles the empty() list as well, and should work with |
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424 | 423 |
425 void Filter::PushDataIntoNextFilter() { | 424 void Filter::PushDataIntoNextFilter() { |
426 IOBuffer* next_buffer = next_filter_->stream_buffer(); | 425 IOBuffer* next_buffer = next_filter_->stream_buffer(); |
427 int next_size = next_filter_->stream_buffer_size(); | 426 int next_size = next_filter_->stream_buffer_size(); |
428 last_status_ = ReadFilteredData(next_buffer->data(), &next_size); | 427 last_status_ = ReadFilteredData(next_buffer->data(), &next_size); |
429 if (FILTER_ERROR != last_status_) | 428 if (FILTER_ERROR != last_status_) |
430 next_filter_->FlushStreamBuffer(next_size); | 429 next_filter_->FlushStreamBuffer(next_size); |
431 } | 430 } |
432 | 431 |
433 } // namespace net | 432 } // namespace net |
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