summaryrefslogtreecommitdiff
path: root/net/http/http_stream_parser.cc
blob: 766ebd3f34332cb5fc408f957120640950667ec4 (plain)
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
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "net/http/http_stream_parser.h"

#include <utility>

#include "base/bind.h"
#include "base/compiler_specific.h"
#include "base/logging.h"
#include "base/metrics/histogram_macros.h"
#include "base/profiler/scoped_tracker.h"
#include "base/strings/string_util.h"
#include "base/values.h"
#include "net/base/io_buffer.h"
#include "net/base/ip_endpoint.h"
#include "net/base/upload_data_stream.h"
#include "net/http/http_chunked_decoder.h"
#include "net/http/http_request_headers.h"
#include "net/http/http_request_info.h"
#include "net/http/http_response_headers.h"
#include "net/http/http_status_line_validator.h"
#include "net/http/http_util.h"
#include "net/log/net_log_event_type.h"
#include "net/socket/client_socket_handle.h"
#include "net/socket/ssl_client_socket.h"
#include "net/ssl/token_binding.h"
#include "url/url_canon.h"

namespace net {

namespace {

enum HttpHeaderParserEvent {
  HEADER_PARSER_INVOKED = 0,
  // Obsolete: HEADER_HTTP_09_RESPONSE = 1,
  HEADER_ALLOWED_TRUNCATED_HEADERS = 2,
  HEADER_SKIPPED_WS_PREFIX = 3,
  HEADER_SKIPPED_NON_WS_PREFIX = 4,
  HEADER_HTTP_09_RESPONSE_OVER_HTTP = 5,
  HEADER_HTTP_09_RESPONSE_OVER_SSL = 6,
  HEADER_HTTP_09_ON_REUSED_SOCKET = 7,
  NUM_HEADER_EVENTS
};

void RecordHeaderParserEvent(HttpHeaderParserEvent header_event) {
  UMA_HISTOGRAM_ENUMERATION("Net.HttpHeaderParserEvent", header_event,
                            NUM_HEADER_EVENTS);
}

const uint64_t kMaxMergedHeaderAndBodySize = 1400;
const size_t kRequestBodyBufferSize = 1 << 14;  // 16KB

std::string GetResponseHeaderLines(const HttpResponseHeaders& headers) {
  std::string raw_headers = headers.raw_headers();
  const char* null_separated_headers = raw_headers.c_str();
  const char* header_line = null_separated_headers;
  std::string cr_separated_headers;
  while (header_line[0] != 0) {
    cr_separated_headers += header_line;
    cr_separated_headers += "\n";
    header_line += strlen(header_line) + 1;
  }
  return cr_separated_headers;
}

// Return true if |headers| contain multiple |field_name| fields with different
// values.
bool HeadersContainMultipleCopiesOfField(const HttpResponseHeaders& headers,
                                         const std::string& field_name) {
  size_t it = 0;
  std::string field_value;
  if (!headers.EnumerateHeader(&it, field_name, &field_value))
    return false;
  // There's at least one |field_name| header.  Check if there are any more
  // such headers, and if so, return true if they have different values.
  std::string field_value2;
  while (headers.EnumerateHeader(&it, field_name, &field_value2)) {
    if (field_value != field_value2)
      return true;
  }
  return false;
}

std::unique_ptr<base::Value> NetLogSendRequestBodyCallback(
    uint64_t length,
    bool is_chunked,
    bool did_merge,
    NetLogCaptureMode /* capture_mode */) {
  std::unique_ptr<base::DictionaryValue> dict(new base::DictionaryValue());
  dict->SetInteger("length", static_cast<int>(length));
  dict->SetBoolean("is_chunked", is_chunked);
  dict->SetBoolean("did_merge", did_merge);
  return std::move(dict);
}

// Returns true if |error_code| is an error for which we give the server a
// chance to send a body containing error information, if the error was received
// while trying to upload a request body.
bool ShouldTryReadingOnUploadError(int error_code) {
  return (error_code == ERR_CONNECTION_RESET);
}

}  // namespace

// Similar to DrainableIOBuffer(), but this version comes with its own
// storage. The motivation is to avoid repeated allocations of
// DrainableIOBuffer.
//
// Example:
//
// scoped_refptr<SeekableIOBuffer> buf = new SeekableIOBuffer(1024);
// // capacity() == 1024. size() == BytesRemaining() == BytesConsumed() == 0.
// // data() points to the beginning of the buffer.
//
// // Read() takes an IOBuffer.
// int bytes_read = some_reader->Read(buf, buf->capacity());
// buf->DidAppend(bytes_read);
// // size() == BytesRemaining() == bytes_read. data() is unaffected.
//
// while (buf->BytesRemaining() > 0) {
//   // Write() takes an IOBuffer. If it takes const char*, we could
///  // simply use the regular IOBuffer like buf->data() + offset.
//   int bytes_written = Write(buf, buf->BytesRemaining());
//   buf->DidConsume(bytes_written);
// }
// // BytesRemaining() == 0. BytesConsumed() == size().
// // data() points to the end of the consumed bytes (exclusive).
//
// // If you want to reuse the buffer, be sure to clear the buffer.
// buf->Clear();
// // size() == BytesRemaining() == BytesConsumed() == 0.
// // data() points to the beginning of the buffer.
//
class HttpStreamParser::SeekableIOBuffer : public IOBuffer {
 public:
  explicit SeekableIOBuffer(int capacity)
    : IOBuffer(capacity),
      real_data_(data_),
      capacity_(capacity),
      size_(0),
      used_(0) {
  }

  // DidConsume() changes the |data_| pointer so that |data_| always points
  // to the first unconsumed byte.
  void DidConsume(int bytes) {
    SetOffset(used_ + bytes);
  }

  // Returns the number of unconsumed bytes.
  int BytesRemaining() const {
    return size_ - used_;
  }

  // Seeks to an arbitrary point in the buffer. The notion of bytes consumed
  // and remaining are updated appropriately.
  void SetOffset(int bytes) {
    DCHECK_GE(bytes, 0);
    DCHECK_LE(bytes, size_);
    used_ = bytes;
    data_ = real_data_ + used_;
  }

  // Called after data is added to the buffer. Adds |bytes| added to
  // |size_|. data() is unaffected.
  void DidAppend(int bytes) {
    DCHECK_GE(bytes, 0);
    DCHECK_GE(size_ + bytes, 0);
    DCHECK_LE(size_ + bytes, capacity_);
    size_ += bytes;
  }

  // Changes the logical size to 0, and the offset to 0.
  void Clear() {
    size_ = 0;
    SetOffset(0);
  }

  // Returns the logical size of the buffer (i.e the number of bytes of data
  // in the buffer).
  int size() const { return size_; }

  // Returns the capacity of the buffer. The capacity is the size used when
  // the object is created.
  int capacity() const { return capacity_; };

 private:
  ~SeekableIOBuffer() override {
    // data_ will be deleted in IOBuffer::~IOBuffer().
    data_ = real_data_;
  }

  char* real_data_;
  const int capacity_;
  int size_;
  int used_;
};

// 2 CRLFs + max of 8 hex chars.
const size_t HttpStreamParser::kChunkHeaderFooterSize = 12;

HttpStreamParser::HttpStreamParser(ClientSocketHandle* connection,
                                   const HttpRequestInfo* request,
                                   GrowableIOBuffer* read_buffer,
                                   const BoundNetLog& net_log)
    : io_state_(STATE_NONE),
      request_(request),
      request_headers_(nullptr),
      request_headers_length_(0),
      http_09_on_non_default_ports_enabled_(false),
      read_buf_(read_buffer),
      read_buf_unused_offset_(0),
      response_header_start_offset_(-1),
      received_bytes_(0),
      sent_bytes_(0),
      response_(nullptr),
      response_body_length_(-1),
      response_is_keep_alive_(false),
      response_body_read_(0),
      user_read_buf_(nullptr),
      user_read_buf_len_(0),
      connection_(connection),
      net_log_(net_log),
      sent_last_chunk_(false),
      upload_error_(OK),
      weak_ptr_factory_(this) {
  io_callback_ = base::Bind(&HttpStreamParser::OnIOComplete,
                            weak_ptr_factory_.GetWeakPtr());
}

HttpStreamParser::~HttpStreamParser() {
}

int HttpStreamParser::SendRequest(const std::string& request_line,
                                  const HttpRequestHeaders& headers,
                                  HttpResponseInfo* response,
                                  const CompletionCallback& callback) {
  DCHECK_EQ(STATE_NONE, io_state_);
  DCHECK(callback_.is_null());
  DCHECK(!callback.is_null());
  DCHECK(response);

  net_log_.AddEvent(NetLogEventType::HTTP_TRANSACTION_SEND_REQUEST_HEADERS,
                    base::Bind(&HttpRequestHeaders::NetLogCallback,
                               base::Unretained(&headers), &request_line));

  DVLOG(1) << __func__ << "() request_line = \"" << request_line << "\""
           << " headers = \"" << headers.ToString() << "\"";
  response_ = response;

  // Put the peer's IP address and port into the response.
  IPEndPoint ip_endpoint;
  int result = connection_->socket()->GetPeerAddress(&ip_endpoint);
  if (result != OK)
    return result;
  response_->socket_address = HostPortPair::FromIPEndPoint(ip_endpoint);

  std::string request = request_line + headers.ToString();
  request_headers_length_ = request.size();

  if (request_->upload_data_stream != NULL) {
    request_body_send_buf_ = new SeekableIOBuffer(kRequestBodyBufferSize);
    if (request_->upload_data_stream->is_chunked()) {
      // Read buffer is adjusted to guarantee that |request_body_send_buf_| is
      // large enough to hold the encoded chunk.
      request_body_read_buf_ =
          new SeekableIOBuffer(kRequestBodyBufferSize - kChunkHeaderFooterSize);
    } else {
      // No need to encode request body, just send the raw data.
      request_body_read_buf_ = request_body_send_buf_;
    }
  }

  io_state_ = STATE_SEND_HEADERS;

  // If we have a small request body, then we'll merge with the headers into a
  // single write.
  bool did_merge = false;
  if (ShouldMergeRequestHeadersAndBody(request, request_->upload_data_stream)) {
    int merged_size = static_cast<int>(
        request_headers_length_ + request_->upload_data_stream->size());
    scoped_refptr<IOBuffer> merged_request_headers_and_body(
        new IOBuffer(merged_size));
    // We'll repurpose |request_headers_| to store the merged headers and
    // body.
    request_headers_ = new DrainableIOBuffer(
        merged_request_headers_and_body.get(), merged_size);

    memcpy(request_headers_->data(), request.data(), request_headers_length_);
    request_headers_->DidConsume(request_headers_length_);

    uint64_t todo = request_->upload_data_stream->size();
    while (todo) {
      int consumed = request_->upload_data_stream->Read(
          request_headers_.get(), static_cast<int>(todo), CompletionCallback());
      // Read() must succeed synchronously if not chunked and in memory.
      DCHECK_GT(consumed, 0);
      request_headers_->DidConsume(consumed);
      todo -= consumed;
    }
    DCHECK(request_->upload_data_stream->IsEOF());
    // Reset the offset, so the buffer can be read from the beginning.
    request_headers_->SetOffset(0);
    did_merge = true;

    net_log_.AddEvent(NetLogEventType::HTTP_TRANSACTION_SEND_REQUEST_BODY,
                      base::Bind(&NetLogSendRequestBodyCallback,
                                 request_->upload_data_stream->size(),
                                 false, /* not chunked */
                                 true /* merged */));
  }

  if (!did_merge) {
    // If we didn't merge the body with the headers, then |request_headers_|
    // contains just the HTTP headers.
    scoped_refptr<StringIOBuffer> headers_io_buf(new StringIOBuffer(request));
    request_headers_ =
        new DrainableIOBuffer(headers_io_buf.get(), headers_io_buf->size());
  }

  result = DoLoop(OK);
  if (result == ERR_IO_PENDING)
    callback_ = callback;

  return result > 0 ? OK : result;
}

int HttpStreamParser::ReadResponseHeaders(const CompletionCallback& callback) {
  DCHECK(io_state_ == STATE_NONE || io_state_ == STATE_DONE);
  DCHECK(callback_.is_null());
  DCHECK(!callback.is_null());
  DCHECK_EQ(0, read_buf_unused_offset_);
  DCHECK(SendRequestBuffersEmpty());

  // This function can be called with io_state_ == STATE_DONE if the
  // connection is closed after seeing just a 1xx response code.
  if (io_state_ == STATE_DONE)
    return ERR_CONNECTION_CLOSED;

  int result = OK;
  io_state_ = STATE_READ_HEADERS;

  if (read_buf_->offset() > 0) {
    // Simulate the state where the data was just read from the socket.
    result = read_buf_->offset();
    read_buf_->set_offset(0);
  }
  if (result > 0)
    io_state_ = STATE_READ_HEADERS_COMPLETE;

  result = DoLoop(result);
  if (result == ERR_IO_PENDING)
    callback_ = callback;

  return result > 0 ? OK : result;
}

void HttpStreamParser::Close(bool not_reusable) {
  if (not_reusable && connection_->socket())
    connection_->socket()->Disconnect();
  connection_->Reset();
}

int HttpStreamParser::ReadResponseBody(IOBuffer* buf, int buf_len,
                                       const CompletionCallback& callback) {
  DCHECK(io_state_ == STATE_NONE || io_state_ == STATE_DONE);
  DCHECK(callback_.is_null());
  DCHECK(!callback.is_null());
  DCHECK_LE(buf_len, kMaxBufSize);
  DCHECK(SendRequestBuffersEmpty());
  // Added to investigate crbug.com/499663.
  CHECK(buf);

  if (io_state_ == STATE_DONE)
    return OK;

  user_read_buf_ = buf;
  user_read_buf_len_ = buf_len;
  io_state_ = STATE_READ_BODY;

  int result = DoLoop(OK);
  if (result == ERR_IO_PENDING)
    callback_ = callback;

  return result;
}

void HttpStreamParser::OnIOComplete(int result) {
  result = DoLoop(result);

  // The client callback can do anything, including destroying this class,
  // so any pending callback must be issued after everything else is done.
  if (result != ERR_IO_PENDING && !callback_.is_null()) {
    CompletionCallback c = callback_;
    callback_.Reset();
    c.Run(result);
  }
}

int HttpStreamParser::DoLoop(int result) {
  do {
    DCHECK_NE(ERR_IO_PENDING, result);
    DCHECK_NE(STATE_DONE, io_state_);
    DCHECK_NE(STATE_NONE, io_state_);
    State state = io_state_;
    io_state_ = STATE_NONE;
    switch (state) {
      case STATE_SEND_HEADERS:
        DCHECK_EQ(OK, result);
        result = DoSendHeaders();
        DCHECK_NE(STATE_NONE, io_state_);
        break;
      case STATE_SEND_HEADERS_COMPLETE:
        result = DoSendHeadersComplete(result);
        DCHECK_NE(STATE_NONE, io_state_);
        break;
      case STATE_SEND_BODY:
        DCHECK_EQ(OK, result);
        result = DoSendBody();
        DCHECK_NE(STATE_NONE, io_state_);
        break;
      case STATE_SEND_BODY_COMPLETE:
        result = DoSendBodyComplete(result);
        DCHECK_NE(STATE_NONE, io_state_);
        break;
      case STATE_SEND_REQUEST_READ_BODY_COMPLETE:
        result = DoSendRequestReadBodyComplete(result);
        DCHECK_NE(STATE_NONE, io_state_);
        break;
      case STATE_SEND_REQUEST_COMPLETE:
        result = DoSendRequestComplete(result);
        break;
      case STATE_READ_HEADERS:
        net_log_.BeginEvent(NetLogEventType::HTTP_STREAM_PARSER_READ_HEADERS);
        DCHECK_GE(result, 0);
        result = DoReadHeaders();
        break;
      case STATE_READ_HEADERS_COMPLETE:
        result = DoReadHeadersComplete(result);
        net_log_.EndEventWithNetErrorCode(
            NetLogEventType::HTTP_STREAM_PARSER_READ_HEADERS, result);
        break;
      case STATE_READ_BODY:
        DCHECK_GE(result, 0);
        result = DoReadBody();
        break;
      case STATE_READ_BODY_COMPLETE:
        result = DoReadBodyComplete(result);
        break;
      default:
        NOTREACHED();
        break;
    }
  } while (result != ERR_IO_PENDING &&
           (io_state_ != STATE_DONE && io_state_ != STATE_NONE));

  return result;
}

int HttpStreamParser::DoSendHeaders() {
  // TODO(mmenke): Remove ScopedTracker below once crbug.com/424359 is fixed.
  tracked_objects::ScopedTracker tracking_profile(
      FROM_HERE_WITH_EXPLICIT_FUNCTION(
          "424359 HttpStreamParser::DoSendHeaders"));

  int bytes_remaining = request_headers_->BytesRemaining();
  DCHECK_GT(bytes_remaining, 0);

  // Record our best estimate of the 'request time' as the time when we send
  // out the first bytes of the request headers.
  if (bytes_remaining == request_headers_->size())
    response_->request_time = base::Time::Now();

  io_state_ = STATE_SEND_HEADERS_COMPLETE;
  return connection_->socket()
      ->Write(request_headers_.get(), bytes_remaining, io_callback_);
}

int HttpStreamParser::DoSendHeadersComplete(int result) {
  if (result < 0) {
    // In the unlikely case that the headers and body were merged, all the
    // the headers were sent, but not all of the body way, and |result| is
    // an error that this should try reading after, stash the error for now and
    // act like the request was successfully sent.
    io_state_ = STATE_SEND_REQUEST_COMPLETE;
    if (request_headers_->BytesConsumed() >= request_headers_length_ &&
        ShouldTryReadingOnUploadError(result)) {
      upload_error_ = result;
      return OK;
    }
    return result;
  }

  sent_bytes_ += result;
  request_headers_->DidConsume(result);
  if (request_headers_->BytesRemaining() > 0) {
    io_state_ = STATE_SEND_HEADERS;
    return OK;
  }

  if (request_->upload_data_stream != NULL &&
      (request_->upload_data_stream->is_chunked() ||
      // !IsEOF() indicates that the body wasn't merged.
      (request_->upload_data_stream->size() > 0 &&
        !request_->upload_data_stream->IsEOF()))) {
    net_log_.AddEvent(NetLogEventType::HTTP_TRANSACTION_SEND_REQUEST_BODY,
                      base::Bind(&NetLogSendRequestBodyCallback,
                                 request_->upload_data_stream->size(),
                                 request_->upload_data_stream->is_chunked(),
                                 false /* not merged */));
    io_state_ = STATE_SEND_BODY;
    return OK;
  }

  // Finished sending the request.
  io_state_ = STATE_SEND_REQUEST_COMPLETE;
  return OK;
}

int HttpStreamParser::DoSendBody() {
  if (request_body_send_buf_->BytesRemaining() > 0) {
    io_state_ = STATE_SEND_BODY_COMPLETE;
    return connection_->socket()
        ->Write(request_body_send_buf_.get(),
                request_body_send_buf_->BytesRemaining(),
                io_callback_);
  }

  if (request_->upload_data_stream->is_chunked() && sent_last_chunk_) {
    // Finished sending the request.
    io_state_ = STATE_SEND_REQUEST_COMPLETE;
    return OK;
  }

  request_body_read_buf_->Clear();
  io_state_ = STATE_SEND_REQUEST_READ_BODY_COMPLETE;
  return request_->upload_data_stream->Read(request_body_read_buf_.get(),
                                            request_body_read_buf_->capacity(),
                                            io_callback_);
}

int HttpStreamParser::DoSendBodyComplete(int result) {
  if (result < 0) {
    // If |result| is an error that this should try reading after, stash the
    // error for now and act like the request was successfully sent.
    io_state_ = STATE_SEND_REQUEST_COMPLETE;
    if (ShouldTryReadingOnUploadError(result)) {
      upload_error_ = result;
      return OK;
    }
    return result;
  }

  sent_bytes_ += result;
  request_body_send_buf_->DidConsume(result);

  io_state_ = STATE_SEND_BODY;
  return OK;
}

int HttpStreamParser::DoSendRequestReadBodyComplete(int result) {
  // |result| is the result of read from the request body from the last call to
  // DoSendBody().
  if (result < 0) {
    io_state_ = STATE_SEND_REQUEST_COMPLETE;
    return result;
  }

  // Chunked data needs to be encoded.
  if (request_->upload_data_stream->is_chunked()) {
    if (result == 0) {  // Reached the end.
      DCHECK(request_->upload_data_stream->IsEOF());
      sent_last_chunk_ = true;
    }
    // Encode the buffer as 1 chunk.
    const base::StringPiece payload(request_body_read_buf_->data(), result);
    request_body_send_buf_->Clear();
    result = EncodeChunk(payload,
                         request_body_send_buf_->data(),
                         request_body_send_buf_->capacity());
  }

  if (result == 0) {  // Reached the end.
    // Reaching EOF means we can finish sending request body unless the data is
    // chunked. (i.e. No need to send the terminal chunk.)
    DCHECK(request_->upload_data_stream->IsEOF());
    DCHECK(!request_->upload_data_stream->is_chunked());
    // Finished sending the request.
    io_state_ = STATE_SEND_REQUEST_COMPLETE;
  } else if (result > 0) {
    request_body_send_buf_->DidAppend(result);
    result = 0;
    io_state_ = STATE_SEND_BODY;
  }
  return result;
}

int HttpStreamParser::DoSendRequestComplete(int result) {
  DCHECK_NE(result, ERR_IO_PENDING);
  request_headers_ = nullptr;
  request_body_send_buf_ = nullptr;
  request_body_read_buf_ = nullptr;

  return result;
}

int HttpStreamParser::DoReadHeaders() {
  io_state_ = STATE_READ_HEADERS_COMPLETE;

  // Grow the read buffer if necessary.
  if (read_buf_->RemainingCapacity() == 0)
    read_buf_->SetCapacity(read_buf_->capacity() + kHeaderBufInitialSize);

  // http://crbug.com/16371: We're seeing |user_buf_->data()| return NULL.
  // See if the user is passing in an IOBuffer with a NULL |data_|.
  CHECK(read_buf_->data());

  return connection_->socket()
      ->Read(read_buf_.get(), read_buf_->RemainingCapacity(), io_callback_);
}

int HttpStreamParser::DoReadHeadersComplete(int result) {
  // DoReadHeadersComplete is called with the result of Socket::Read, which is a
  // (byte_count | error), and returns (error | OK).

  result = HandleReadHeaderResult(result);

  // TODO(mmenke):  The code below is ugly and hacky.  A much better and more
  // flexible long term solution would be to separate out the read and write
  // loops, though this would involve significant changes, both here and
  // elsewhere (WebSockets, for instance).

  // If still reading the headers, or there was no error uploading the request
  // body, just return the result.
  if (io_state_ == STATE_READ_HEADERS || upload_error_ == OK)
    return result;

  // If the result is ERR_IO_PENDING, |io_state_| should be STATE_READ_HEADERS.
  DCHECK_NE(ERR_IO_PENDING, result);

  // On errors, use the original error received when sending the request.
  // The main cases where these are different is when there's a header-related
  // error code, or when there's an ERR_CONNECTION_CLOSED, which can result in
  // special handling of partial responses and HTTP/0.9 responses.
  if (result < 0) {
    // Nothing else to do.  In the HTTP/0.9 or only partial headers received
    // cases, can normally go to other states after an error reading headers.
    io_state_ = STATE_DONE;
    // Don't let caller see the headers.
    response_->headers = nullptr;
    return upload_error_;
  }

  // Skip over 1xx responses as usual, and allow 4xx/5xx error responses to
  // override the error received while uploading the body.
  int response_code_class = response_->headers->response_code() / 100;
  if (response_code_class == 1 || response_code_class == 4 ||
      response_code_class == 5) {
    return result;
  }

  // All other status codes are not allowed after an error during upload, to
  // make sure the consumer has some indication there was an error.

  // Nothing else to do.
  io_state_ = STATE_DONE;
  // Don't let caller see the headers.
  response_->headers = nullptr;
  return upload_error_;
}

int HttpStreamParser::DoReadBody() {
  io_state_ = STATE_READ_BODY_COMPLETE;

  // Added to investigate crbug.com/499663.
  CHECK(user_read_buf_.get());

  // There may be some data left over from reading the response headers.
  if (read_buf_->offset()) {
    int available = read_buf_->offset() - read_buf_unused_offset_;
    if (available) {
      CHECK_GT(available, 0);
      int bytes_from_buffer = std::min(available, user_read_buf_len_);
      memcpy(user_read_buf_->data(),
             read_buf_->StartOfBuffer() + read_buf_unused_offset_,
             bytes_from_buffer);
      read_buf_unused_offset_ += bytes_from_buffer;
      if (bytes_from_buffer == available) {
        read_buf_->SetCapacity(0);
        read_buf_unused_offset_ = 0;
      }
      return bytes_from_buffer;
    } else {
      read_buf_->SetCapacity(0);
      read_buf_unused_offset_ = 0;
    }
  }

  // Check to see if we're done reading.
  if (IsResponseBodyComplete())
    return 0;

  DCHECK_EQ(0, read_buf_->offset());
  return connection_->socket()
      ->Read(user_read_buf_.get(), user_read_buf_len_, io_callback_);
}

int HttpStreamParser::DoReadBodyComplete(int result) {
  // When the connection is closed, there are numerous ways to interpret it.
  //
  //  - If a Content-Length header is present and the body contains exactly that
  //    number of bytes at connection close, the response is successful.
  //
  //  - If a Content-Length header is present and the body contains fewer bytes
  //    than promised by the header at connection close, it may indicate that
  //    the connection was closed prematurely, or it may indicate that the
  //    server sent an invalid Content-Length header. Unfortunately, the invalid
  //    Content-Length header case does occur in practice and other browsers are
  //    tolerant of it. We choose to treat it as an error for now, but the
  //    download system treats it as a non-error, and URLRequestHttpJob also
  //    treats it as OK if the Content-Length is the post-decoded body content
  //    length.
  //
  //  - If chunked encoding is used and the terminating chunk has been processed
  //    when the connection is closed, the response is successful.
  //
  //  - If chunked encoding is used and the terminating chunk has not been
  //    processed when the connection is closed, it may indicate that the
  //    connection was closed prematurely or it may indicate that the server
  //    sent an invalid chunked encoding. We choose to treat it as
  //    an invalid chunked encoding.
  //
  //  - If a Content-Length is not present and chunked encoding is not used,
  //    connection close is the only way to signal that the response is
  //    complete. Unfortunately, this also means that there is no way to detect
  //    early close of a connection. No error is returned.
  if (result == 0 && !IsResponseBodyComplete() && CanFindEndOfResponse()) {
    if (chunked_decoder_.get())
      result = ERR_INCOMPLETE_CHUNKED_ENCODING;
    else
      result = ERR_CONTENT_LENGTH_MISMATCH;
  }

  if (result > 0)
    received_bytes_ += result;

  // Filter incoming data if appropriate.  FilterBuf may return an error.
  if (result > 0 && chunked_decoder_.get()) {
    result = chunked_decoder_->FilterBuf(user_read_buf_->data(), result);
    if (result == 0 && !chunked_decoder_->reached_eof()) {
      // Don't signal completion of the Read call yet or else it'll look like
      // we received end-of-file.  Wait for more data.
      io_state_ = STATE_READ_BODY;
      return OK;
    }
  }

  if (result > 0)
    response_body_read_ += result;

  if (result <= 0 || IsResponseBodyComplete()) {
    io_state_ = STATE_DONE;

    // Save the overflow data, which can be in two places.  There may be
    // some left over in |user_read_buf_|, plus there may be more
    // in |read_buf_|.  But the part left over in |user_read_buf_| must have
    // come from the |read_buf_|, so there's room to put it back at the
    // start first.
    int additional_save_amount = read_buf_->offset() - read_buf_unused_offset_;
    int save_amount = 0;
    if (chunked_decoder_.get()) {
      save_amount = chunked_decoder_->bytes_after_eof();
    } else if (response_body_length_ >= 0) {
      int64_t extra_data_read = response_body_read_ - response_body_length_;
      if (extra_data_read > 0) {
        save_amount = static_cast<int>(extra_data_read);
        if (result > 0)
          result -= save_amount;
      }
    }

    CHECK_LE(save_amount + additional_save_amount, kMaxBufSize);
    if (read_buf_->capacity() < save_amount + additional_save_amount) {
      read_buf_->SetCapacity(save_amount + additional_save_amount);
    }

    if (save_amount) {
      received_bytes_ -= save_amount;
      memcpy(read_buf_->StartOfBuffer(), user_read_buf_->data() + result,
             save_amount);
    }
    read_buf_->set_offset(save_amount);
    if (additional_save_amount) {
      memmove(read_buf_->data(),
              read_buf_->StartOfBuffer() + read_buf_unused_offset_,
              additional_save_amount);
      read_buf_->set_offset(save_amount + additional_save_amount);
    }
    read_buf_unused_offset_ = 0;
  } else {
    // Now waiting for more of the body to be read.
    user_read_buf_ = NULL;
    user_read_buf_len_ = 0;
  }

  return result;
}

int HttpStreamParser::HandleReadHeaderResult(int result) {
  DCHECK_EQ(0, read_buf_unused_offset_);

  if (result == 0)
    result = ERR_CONNECTION_CLOSED;

  if (result == ERR_CONNECTION_CLOSED) {
    // The connection closed without getting any more data.
    if (read_buf_->offset() == 0) {
      io_state_ = STATE_DONE;
      // If the connection has not been reused, it may have been a 0-length
      // HTTP/0.9 responses, but it was most likely an error, so just return
      // ERR_EMPTY_RESPONSE instead. If the connection was reused, just pass
      // on the original connection close error, as rather than being an
      // empty HTTP/0.9 response it's much more likely the server closed the
      // socket before it received the request.
      if (!connection_->is_reused())
        return ERR_EMPTY_RESPONSE;
      return result;
    }

    // Accepting truncated headers over HTTPS is a potential security
    // vulnerability, so just return an error in that case.
    //
    // If response_header_start_offset_ is -1, this may be a < 8 byte HTTP/0.9
    // response. However, accepting such a response over HTTPS would allow a
    // MITM to truncate an HTTP/1.x status line to look like a short HTTP/0.9
    // response if the peer put a record boundary at the first 8 bytes. To
    // ensure that all response headers received over HTTPS are pristine, treat
    // such responses as errors.
    //
    // TODO(mmenke):  Returning ERR_RESPONSE_HEADERS_TRUNCATED when a response
    // looks like an HTTP/0.9 response is weird.  Should either come up with
    // another error code, or, better, disable HTTP/0.9 over HTTPS (and give
    // that a new error code).
    if (request_->url.SchemeIsCryptographic()) {
      io_state_ = STATE_DONE;
      return ERR_RESPONSE_HEADERS_TRUNCATED;
    }

    // Parse things as well as we can and let the caller decide what to do.
    int end_offset;
    if (response_header_start_offset_ >= 0) {
      // The response looks to be a truncated set of HTTP headers.
      io_state_ = STATE_READ_BODY_COMPLETE;
      end_offset = read_buf_->offset();
      RecordHeaderParserEvent(HEADER_ALLOWED_TRUNCATED_HEADERS);
    } else {
      // The response is apparently using HTTP/0.9.  Treat the entire response
      // as the body.
      end_offset = 0;
    }
    int rv = ParseResponseHeaders(end_offset);
    if (rv < 0)
      return rv;
    return result;
  }

  if (result < 0) {
    io_state_ = STATE_DONE;
    return result;
  }

  // Record our best estimate of the 'response time' as the time when we read
  // the first bytes of the response headers.
  if (read_buf_->offset() == 0)
    response_->response_time = base::Time::Now();

  read_buf_->set_offset(read_buf_->offset() + result);
  DCHECK_LE(read_buf_->offset(), read_buf_->capacity());
  DCHECK_GT(result, 0);

  int end_of_header_offset = FindAndParseResponseHeaders();

  // Note: -1 is special, it indicates we haven't found the end of headers.
  // Anything less than -1 is a net::Error, so we bail out.
  if (end_of_header_offset < -1)
    return end_of_header_offset;

  if (end_of_header_offset == -1) {
    io_state_ = STATE_READ_HEADERS;
    // Prevent growing the headers buffer indefinitely.
    if (read_buf_->offset() >= kMaxHeaderBufSize) {
      io_state_ = STATE_DONE;
      return ERR_RESPONSE_HEADERS_TOO_BIG;
    }
  } else {
    CalculateResponseBodySize();

    // If the body is zero length, the caller may not call ReadResponseBody,
    // which is where any extra data is copied to read_buf_, so we move the
    // data here.
    if (response_body_length_ == 0) {
      int extra_bytes = read_buf_->offset() - end_of_header_offset;
      if (extra_bytes) {
        CHECK_GT(extra_bytes, 0);
        memmove(read_buf_->StartOfBuffer(),
                read_buf_->StartOfBuffer() + end_of_header_offset,
                extra_bytes);
      }
      read_buf_->SetCapacity(extra_bytes);
      if (response_->headers->response_code() / 100 == 1) {
        // After processing a 1xx response, the caller will ask for the next
        // header, so reset state to support that. We don't completely ignore a
        // 1xx response because it cannot be returned in reply to a CONNECT
        // request so we return OK here, which lets the caller inspect the
        // response and reject it in the event that we're setting up a CONNECT
        // tunnel.
        response_header_start_offset_ = -1;
        response_body_length_ = -1;
        // Now waiting for the second set of headers to be read.
      } else {
        // Only set keep-alive based on final set of headers.
        response_is_keep_alive_ = response_->headers->IsKeepAlive();

        io_state_ = STATE_DONE;
      }
      return OK;
    }

    // Only set keep-alive based on final set of headers.
    response_is_keep_alive_ = response_->headers->IsKeepAlive();

    // Note where the headers stop.
    read_buf_unused_offset_ = end_of_header_offset;
    // Now waiting for the body to be read.
  }
  return OK;
}

int HttpStreamParser::FindAndParseResponseHeaders() {
  int end_offset = -1;
  DCHECK_EQ(0, read_buf_unused_offset_);

  // Look for the start of the status line, if it hasn't been found yet.
  if (response_header_start_offset_ < 0) {
    response_header_start_offset_ = HttpUtil::LocateStartOfStatusLine(
        read_buf_->StartOfBuffer(), read_buf_->offset());
  }

  if (response_header_start_offset_ >= 0) {
    end_offset = HttpUtil::LocateEndOfHeaders(read_buf_->StartOfBuffer(),
                                              read_buf_->offset(),
                                              response_header_start_offset_);
  } else if (read_buf_->offset() >= 8) {
    // Enough data to decide that this is an HTTP/0.9 response.
    // 8 bytes = (4 bytes of junk) + "http".length()
    end_offset = 0;
  }

  if (end_offset == -1)
    return -1;

  int rv = ParseResponseHeaders(end_offset);
  if (rv < 0)
    return rv;
  return end_offset;
}

int HttpStreamParser::ParseResponseHeaders(int end_offset) {
  scoped_refptr<HttpResponseHeaders> headers;
  DCHECK_EQ(0, read_buf_unused_offset_);

  RecordHeaderParserEvent(HEADER_PARSER_INVOKED);

  if (response_header_start_offset_ > 0) {
    bool has_non_whitespace_in_prefix = false;
    for (int i = 0; i < response_header_start_offset_; ++i) {
      if (!strchr(" \t\r\n", read_buf_->StartOfBuffer()[i])) {
        has_non_whitespace_in_prefix = true;
        break;
      }
    }
    if (has_non_whitespace_in_prefix) {
      RecordHeaderParserEvent(HEADER_SKIPPED_NON_WS_PREFIX);
    } else {
      RecordHeaderParserEvent(HEADER_SKIPPED_WS_PREFIX);
    }
  }

  if (response_header_start_offset_ >= 0) {
    received_bytes_ += end_offset;
    std::string raw_headers =
        HttpUtil::AssembleRawHeaders(read_buf_->StartOfBuffer(), end_offset);
    ValidateStatusLine(
        std::string(read_buf_->StartOfBuffer(), raw_headers.find('\0')));
    headers = new HttpResponseHeaders(raw_headers);
  } else {
    // Enough data was read -- there is no status line, so this is HTTP/0.9, or
    // the server is broken / doesn't speak HTTP.

    // If the port is not the default for the scheme, assume it's not a real
    // HTTP/0.9 response, and fail the request.
    // TODO(crbug.com/624462):  Further restrict the cases in which we allow
    // HTTP/0.9.
    std::string scheme(request_->url.scheme());
    if (!http_09_on_non_default_ports_enabled_ &&
        url::DefaultPortForScheme(scheme.c_str(), scheme.length()) !=
            request_->url.EffectiveIntPort()) {
      return ERR_INVALID_HTTP_RESPONSE;
    }

    headers = new HttpResponseHeaders(std::string("HTTP/0.9 200 OK"));

    if (request_->url.SchemeIsCryptographic()) {
      RecordHeaderParserEvent(HEADER_HTTP_09_RESPONSE_OVER_SSL);
    } else {
      RecordHeaderParserEvent(HEADER_HTTP_09_RESPONSE_OVER_HTTP);
    }
    if (connection_->is_reused())
      RecordHeaderParserEvent(HEADER_HTTP_09_ON_REUSED_SOCKET);
  }

  // Check for multiple Content-Length headers when the response is not
  // chunked-encoded.  If they exist, and have distinct values, it's a potential
  // response smuggling attack.
  if (!headers->IsChunkEncoded()) {
    if (HeadersContainMultipleCopiesOfField(*headers, "Content-Length"))
      return ERR_RESPONSE_HEADERS_MULTIPLE_CONTENT_LENGTH;
  }

  // Check for multiple Content-Disposition or Location headers.  If they exist,
  // it's also a potential response smuggling attack.
  if (HeadersContainMultipleCopiesOfField(*headers, "Content-Disposition"))
    return ERR_RESPONSE_HEADERS_MULTIPLE_CONTENT_DISPOSITION;
  if (HeadersContainMultipleCopiesOfField(*headers, "Location"))
    return ERR_RESPONSE_HEADERS_MULTIPLE_LOCATION;

  response_->headers = headers;
  if (headers->GetHttpVersion() == HttpVersion(0, 9)) {
    response_->connection_info = HttpResponseInfo::CONNECTION_INFO_HTTP0_9;
  } else if (headers->GetHttpVersion() == HttpVersion(1, 0)) {
    response_->connection_info = HttpResponseInfo::CONNECTION_INFO_HTTP1_0;
  } else if (headers->GetHttpVersion() == HttpVersion(1, 1)) {
    response_->connection_info = HttpResponseInfo::CONNECTION_INFO_HTTP1_1;
  }
  response_->vary_data.Init(*request_, *response_->headers);
  DVLOG(1) << __func__ << "() content_length = \""
           << response_->headers->GetContentLength() << "\n\""
           << " headers = \"" << GetResponseHeaderLines(*response_->headers)
           << "\"";
  return OK;
}

void HttpStreamParser::CalculateResponseBodySize() {
  // Figure how to determine EOF:

  // For certain responses, we know the content length is always 0. From
  // RFC 7230 Section 3.3 Message Body:
  //
  // The presence of a message body in a response depends on both the
  // request method to which it is responding and the response status code
  // (Section 3.1.2).  Responses to the HEAD request method (Section 4.3.2
  // of [RFC7231]) never include a message body because the associated
  // response header fields (e.g., Transfer-Encoding, Content-Length,
  // etc.), if present, indicate only what their values would have been if
  // the request method had been GET (Section 4.3.1 of [RFC7231]). 2xx
  // (Successful) responses to a CONNECT request method (Section 4.3.6 of
  // [RFC7231]) switch to tunnel mode instead of having a message body.
  // All 1xx (Informational), 204 (No Content), and 304 (Not Modified)
  // responses do not include a message body.  All other responses do
  // include a message body, although the body might be of zero length.
  //
  // From RFC 7231 Section 6.3.6 205 Reset Content:
  //
  // Since the 205 status code implies that no additional content will be
  // provided, a server MUST NOT generate a payload in a 205 response.
  if (response_->headers->response_code() / 100 == 1) {
    response_body_length_ = 0;
  } else {
    switch (response_->headers->response_code()) {
      case 204:  // No Content
      case 205:  // Reset Content
      case 304:  // Not Modified
        response_body_length_ = 0;
        break;
    }
  }
  if (request_->method == "HEAD")
    response_body_length_ = 0;

  if (response_body_length_ == -1) {
    // "Transfer-Encoding: chunked" trumps "Content-Length: N"
    if (response_->headers->IsChunkEncoded()) {
      chunked_decoder_.reset(new HttpChunkedDecoder());
    } else {
      response_body_length_ = response_->headers->GetContentLength();
      // If response_body_length_ is still -1, then we have to wait
      // for the server to close the connection.
    }
  }
}

bool HttpStreamParser::IsResponseBodyComplete() const {
  if (chunked_decoder_.get())
    return chunked_decoder_->reached_eof();
  if (response_body_length_ != -1)
    return response_body_read_ >= response_body_length_;

  return false;  // Must read to EOF.
}

bool HttpStreamParser::CanFindEndOfResponse() const {
  return chunked_decoder_.get() || response_body_length_ >= 0;
}

bool HttpStreamParser::IsMoreDataBuffered() const {
  return read_buf_->offset() > read_buf_unused_offset_;
}

bool HttpStreamParser::IsConnectionReused() const {
  ClientSocketHandle::SocketReuseType reuse_type = connection_->reuse_type();
  return connection_->is_reused() ||
         reuse_type == ClientSocketHandle::UNUSED_IDLE;
}

void HttpStreamParser::SetConnectionReused() {
  connection_->set_reuse_type(ClientSocketHandle::REUSED_IDLE);
}

bool HttpStreamParser::CanReuseConnection() const {
  if (!CanFindEndOfResponse())
    return false;

  if (!response_is_keep_alive_)
    return false;

  // Check if extra data was received after reading the entire response body. If
  // extra data was received, reusing the socket is not a great idea. This does
  // have the down side of papering over certain server bugs, but seems to be
  // the best option here.
  //
  // TODO(mmenke): Consider logging this - hard to decipher socket reuse
  //     behavior makes NetLogs harder to read.
  if (IsResponseBodyComplete() && IsMoreDataBuffered())
    return false;

  return connection_->socket() && connection_->socket()->IsConnected();
}

void HttpStreamParser::GetSSLInfo(SSLInfo* ssl_info) {
  if (request_->url.SchemeIsCryptographic() && connection_->socket()) {
    SSLClientSocket* ssl_socket =
        static_cast<SSLClientSocket*>(connection_->socket());
    ssl_socket->GetSSLInfo(ssl_info);
  }
}

void HttpStreamParser::GetSSLCertRequestInfo(
    SSLCertRequestInfo* cert_request_info) {
  if (request_->url.SchemeIsCryptographic() && connection_->socket()) {
    SSLClientSocket* ssl_socket =
        static_cast<SSLClientSocket*>(connection_->socket());
    ssl_socket->GetSSLCertRequestInfo(cert_request_info);
  }
}

Error HttpStreamParser::GetSignedEKMForTokenBinding(crypto::ECPrivateKey* key,
                                                    std::vector<uint8_t>* out) {
  if (!request_->url.SchemeIsCryptographic() || !connection_->socket()) {
    NOTREACHED();
    return ERR_FAILED;
  }
  SSLClientSocket* ssl_socket =
      static_cast<SSLClientSocket*>(connection_->socket());
  return ssl_socket->GetSignedEKMForTokenBinding(key, out);
}

int HttpStreamParser::EncodeChunk(const base::StringPiece& payload,
                                  char* output,
                                  size_t output_size) {
  if (output_size < payload.size() + kChunkHeaderFooterSize)
    return ERR_INVALID_ARGUMENT;

  char* cursor = output;
  // Add the header.
  const int num_chars = base::snprintf(output, output_size,
                                       "%X\r\n",
                                       static_cast<int>(payload.size()));
  cursor += num_chars;
  // Add the payload if any.
  if (payload.size() > 0) {
    memcpy(cursor, payload.data(), payload.size());
    cursor += payload.size();
  }
  // Add the trailing CRLF.
  memcpy(cursor, "\r\n", 2);
  cursor += 2;

  return cursor - output;
}

// static
bool HttpStreamParser::ShouldMergeRequestHeadersAndBody(
    const std::string& request_headers,
    const UploadDataStream* request_body) {
  if (request_body != NULL &&
      // IsInMemory() ensures that the request body is not chunked.
      request_body->IsInMemory() &&
      request_body->size() > 0) {
    uint64_t merged_size = request_headers.size() + request_body->size();
    if (merged_size <= kMaxMergedHeaderAndBodySize)
      return true;
  }
  return false;
}

void HttpStreamParser::ValidateStatusLine(const std::string& status_line) {
  HttpStatusLineValidator::StatusLineStatus status =
      HttpStatusLineValidator::ValidateStatusLine(status_line);
  UMA_HISTOGRAM_ENUMERATION("Net.HttpStatusLineStatus", status,
                            HttpStatusLineValidator::STATUS_LINE_MAX);
}

bool HttpStreamParser::SendRequestBuffersEmpty() {
  return request_headers_ == nullptr && request_body_send_buf_ == nullptr &&
         request_body_send_buf_ == nullptr;
}

}  // namespace net