summaryrefslogtreecommitdiffstats
path: root/toolkit/components/url-classifier/nsUrlClassifierStreamUpdater.cpp
blob: e230f6951848b3b7eaea0b76b01c629eca6ceca3 (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
//* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsCRT.h"
#include "nsIHttpChannel.h"
#include "nsIObserverService.h"
#include "nsIStringStream.h"
#include "nsIUploadChannel.h"
#include "nsIURI.h"
#include "nsIUrlClassifierDBService.h"
#include "nsNetUtil.h"
#include "nsStreamUtils.h"
#include "nsStringStream.h"
#include "nsToolkitCompsCID.h"
#include "nsUrlClassifierStreamUpdater.h"
#include "mozilla/BasePrincipal.h"
#include "mozilla/ErrorNames.h"
#include "mozilla/Logging.h"
#include "nsIInterfaceRequestor.h"
#include "mozilla/LoadContext.h"
#include "mozilla/Telemetry.h"
#include "nsContentUtils.h"
#include "nsIURLFormatter.h"

using mozilla::DocShellOriginAttributes;

static const char* gQuitApplicationMessage = "quit-application";

// Limit the list file size to 32mb
const uint32_t MAX_FILE_SIZE = (32 * 1024 * 1024);

#undef LOG

// MOZ_LOG=UrlClassifierStreamUpdater:5
static mozilla::LazyLogModule gUrlClassifierStreamUpdaterLog("UrlClassifierStreamUpdater");
#define LOG(args) TrimAndLog args

// Calls nsIURLFormatter::TrimSensitiveURLs to remove sensitive
// info from the logging message.
static void TrimAndLog(const char* aFmt, ...)
{
  nsString raw;

  va_list ap;
  va_start(ap, aFmt);
  raw.AppendPrintf(aFmt, ap);
  va_end(ap);

  nsCOMPtr<nsIURLFormatter> urlFormatter =
    do_GetService("@mozilla.org/toolkit/URLFormatterService;1");

  nsString trimmed;
  nsresult rv = urlFormatter->TrimSensitiveURLs(raw, trimmed);
  if (NS_FAILED(rv)) {
    trimmed = EmptyString();
  }

  MOZ_LOG(gUrlClassifierStreamUpdaterLog,
          mozilla::LogLevel::Debug,
          (NS_ConvertUTF16toUTF8(trimmed).get()));
}

// This class does absolutely nothing, except pass requests onto the DBService.

///////////////////////////////////////////////////////////////////////////////
// nsIUrlClassiferStreamUpdater implementation
// Handles creating/running the stream listener

nsUrlClassifierStreamUpdater::nsUrlClassifierStreamUpdater()
  : mIsUpdating(false), mInitialized(false), mDownloadError(false),
    mBeganStream(false), mChannel(nullptr)
{
  LOG(("nsUrlClassifierStreamUpdater init [this=%p]", this));
}

NS_IMPL_ISUPPORTS(nsUrlClassifierStreamUpdater,
                  nsIUrlClassifierStreamUpdater,
                  nsIUrlClassifierUpdateObserver,
                  nsIRequestObserver,
                  nsIStreamListener,
                  nsIObserver,
                  nsIInterfaceRequestor,
                  nsITimerCallback)

/**
 * Clear out the update.
 */
void
nsUrlClassifierStreamUpdater::DownloadDone()
{
  LOG(("nsUrlClassifierStreamUpdater::DownloadDone [this=%p]", this));
  mIsUpdating = false;

  mPendingUpdates.Clear();
  mDownloadError = false;
  mSuccessCallback = nullptr;
  mUpdateErrorCallback = nullptr;
  mDownloadErrorCallback = nullptr;
}

///////////////////////////////////////////////////////////////////////////////
// nsIUrlClassifierStreamUpdater implementation

nsresult
nsUrlClassifierStreamUpdater::FetchUpdate(nsIURI *aUpdateUrl,
                                          const nsACString & aRequestPayload,
                                          bool aIsPostRequest,
                                          const nsACString & aStreamTable)
{

#ifdef DEBUG
  LOG(("Fetching update %s from %s",
       aRequestPayload.Data(), aUpdateUrl->GetSpecOrDefault().get()));
#endif

  nsresult rv;
  uint32_t loadFlags = nsIChannel::INHIBIT_CACHING |
                       nsIChannel::LOAD_BYPASS_CACHE;
  rv = NS_NewChannel(getter_AddRefs(mChannel),
                     aUpdateUrl,
                     nsContentUtils::GetSystemPrincipal(),
                     nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_IS_NULL,
                     nsIContentPolicy::TYPE_OTHER,
                     nullptr,  // aLoadGroup
                     this,     // aInterfaceRequestor
                     loadFlags);

  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<nsILoadInfo> loadInfo = mChannel->GetLoadInfo();
  loadInfo->SetOriginAttributes(mozilla::NeckoOriginAttributes(NECKO_SAFEBROWSING_APP_ID, false));

  mBeganStream = false;

  if (!aIsPostRequest) {
    // We use POST method to send our request in v2. In v4, the request
    // needs to be embedded to the URL and use GET method to send.
    // However, from the Chromium source code, a extended HTTP header has
    // to be sent along with the request to make the request succeed.
    // The following description is from Chromium source code:
    //
    // "The following header informs the envelope server (which sits in
    // front of Google's stubby server) that the received GET request should be
    // interpreted as a POST."
    //
    nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(mChannel, &rv);
    NS_ENSURE_SUCCESS(rv, rv);

    rv = httpChannel->SetRequestHeader(NS_LITERAL_CSTRING("X-HTTP-Method-Override"),
                                       NS_LITERAL_CSTRING("POST"),
                                       false);
    NS_ENSURE_SUCCESS(rv, rv);
  } else if (!aRequestPayload.IsEmpty()) {
    rv = AddRequestBody(aRequestPayload);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  // Set the appropriate content type for file/data URIs, for unit testing
  // purposes.
  // This is only used for testing and should be deleted.
  bool match;
  if ((NS_SUCCEEDED(aUpdateUrl->SchemeIs("file", &match)) && match) ||
      (NS_SUCCEEDED(aUpdateUrl->SchemeIs("data", &match)) && match)) {
    mChannel->SetContentType(NS_LITERAL_CSTRING("application/vnd.google.safebrowsing-update"));
  } else {
    // We assume everything else is an HTTP request.

    // Disable keepalive.
    nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(mChannel, &rv);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = httpChannel->SetRequestHeader(NS_LITERAL_CSTRING("Connection"), NS_LITERAL_CSTRING("close"), false);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  // Create a custom LoadContext for SafeBrowsing, so we can use callbacks on
  // the channel to query the appId which allows separation of safebrowsing
  // cookies in a separate jar.
  DocShellOriginAttributes attrs;
  attrs.mAppId = NECKO_SAFEBROWSING_APP_ID;
  nsCOMPtr<nsIInterfaceRequestor> sbContext = new mozilla::LoadContext(attrs);
  rv = mChannel->SetNotificationCallbacks(sbContext);
  NS_ENSURE_SUCCESS(rv, rv);

  // Make the request.
  rv = mChannel->AsyncOpen2(this);
  NS_ENSURE_SUCCESS(rv, rv);

  mStreamTable = aStreamTable;

  return NS_OK;
}

nsresult
nsUrlClassifierStreamUpdater::FetchUpdate(const nsACString & aUpdateUrl,
                                          const nsACString & aRequestPayload,
                                          bool aIsPostRequest,
                                          const nsACString & aStreamTable)
{
  LOG(("(pre) Fetching update from %s\n", PromiseFlatCString(aUpdateUrl).get()));

  nsCString updateUrl(aUpdateUrl);
  if (!aIsPostRequest) {
    updateUrl.AppendPrintf("&$req=%s", nsCString(aRequestPayload).get());
  }

  nsCOMPtr<nsIURI> uri;
  nsresult rv = NS_NewURI(getter_AddRefs(uri), updateUrl);
  NS_ENSURE_SUCCESS(rv, rv);

  nsAutoCString urlSpec;
  uri->GetAsciiSpec(urlSpec);

  LOG(("(post) Fetching update from %s\n", urlSpec.get()));

  return FetchUpdate(uri, aRequestPayload, aIsPostRequest, aStreamTable);
}

NS_IMETHODIMP
nsUrlClassifierStreamUpdater::DownloadUpdates(
  const nsACString &aRequestTables,
  const nsACString &aRequestPayload,
  bool aIsPostRequest,
  const nsACString &aUpdateUrl,
  nsIUrlClassifierCallback *aSuccessCallback,
  nsIUrlClassifierCallback *aUpdateErrorCallback,
  nsIUrlClassifierCallback *aDownloadErrorCallback,
  bool *_retval)
{
  NS_ENSURE_ARG(aSuccessCallback);
  NS_ENSURE_ARG(aUpdateErrorCallback);
  NS_ENSURE_ARG(aDownloadErrorCallback);

  if (mIsUpdating) {
    LOG(("Already updating, queueing update %s from %s", aRequestPayload.Data(),
         aUpdateUrl.Data()));
    *_retval = false;
    PendingRequest *request = mPendingRequests.AppendElement();
    request->mTables = aRequestTables;
    request->mRequestPayload = aRequestPayload;
    request->mIsPostRequest = aIsPostRequest;
    request->mUrl = aUpdateUrl;
    request->mSuccessCallback = aSuccessCallback;
    request->mUpdateErrorCallback = aUpdateErrorCallback;
    request->mDownloadErrorCallback = aDownloadErrorCallback;
    return NS_OK;
  }

  if (aUpdateUrl.IsEmpty()) {
    NS_ERROR("updateUrl not set");
    return NS_ERROR_NOT_INITIALIZED;
  }

  nsresult rv;

  if (!mInitialized) {
    // Add an observer for shutdown so we can cancel any pending list
    // downloads.  quit-application is the same event that the download
    // manager listens for and uses to cancel pending downloads.
    nsCOMPtr<nsIObserverService> observerService =
      mozilla::services::GetObserverService();
    if (!observerService)
      return NS_ERROR_FAILURE;

    observerService->AddObserver(this, gQuitApplicationMessage, false);

    mDBService = do_GetService(NS_URLCLASSIFIERDBSERVICE_CONTRACTID, &rv);
    NS_ENSURE_SUCCESS(rv, rv);

    mInitialized = true;
  }

  rv = mDBService->BeginUpdate(this, aRequestTables);
  if (rv == NS_ERROR_NOT_AVAILABLE) {
    LOG(("Service busy, already updating, queuing update %s from %s",
         aRequestPayload.Data(), aUpdateUrl.Data()));
    *_retval = false;
    PendingRequest *request = mPendingRequests.AppendElement();
    request->mTables = aRequestTables;
    request->mRequestPayload = aRequestPayload;
    request->mIsPostRequest = aIsPostRequest;
    request->mUrl = aUpdateUrl;
    request->mSuccessCallback = aSuccessCallback;
    request->mUpdateErrorCallback = aUpdateErrorCallback;
    request->mDownloadErrorCallback = aDownloadErrorCallback;
    return NS_OK;
  }

  if (NS_FAILED(rv)) {
    return rv;
  }

  mSuccessCallback = aSuccessCallback;
  mUpdateErrorCallback = aUpdateErrorCallback;
  mDownloadErrorCallback = aDownloadErrorCallback;

  mIsUpdating = true;
  *_retval = true;

  LOG(("FetchUpdate: %s", aUpdateUrl.Data()));

  return FetchUpdate(aUpdateUrl, aRequestPayload, aIsPostRequest, EmptyCString());
}

///////////////////////////////////////////////////////////////////////////////
// nsIUrlClassifierUpdateObserver implementation

NS_IMETHODIMP
nsUrlClassifierStreamUpdater::UpdateUrlRequested(const nsACString &aUrl,
                                                 const nsACString &aTable)
{
  LOG(("Queuing requested update from %s\n", PromiseFlatCString(aUrl).get()));

  PendingUpdate *update = mPendingUpdates.AppendElement();
  if (!update)
    return NS_ERROR_OUT_OF_MEMORY;

  // Allow data: and file: urls for unit testing purposes, otherwise assume http
  if (StringBeginsWith(aUrl, NS_LITERAL_CSTRING("data:")) ||
      StringBeginsWith(aUrl, NS_LITERAL_CSTRING("file:"))) {
    update->mUrl = aUrl;
  } else {
    // For unittesting update urls to localhost should use http, not https
    // (otherwise the connection will fail silently, since there will be no
    // cert available).
    if (!StringBeginsWith(aUrl, NS_LITERAL_CSTRING("localhost"))) {
      update->mUrl = NS_LITERAL_CSTRING("https://") + aUrl;
    } else {
      update->mUrl = NS_LITERAL_CSTRING("http://") + aUrl;
    }
  }
  update->mTable = aTable;

  return NS_OK;
}

nsresult
nsUrlClassifierStreamUpdater::FetchNext()
{
  if (mPendingUpdates.Length() == 0) {
    return NS_OK;
  }

  PendingUpdate &update = mPendingUpdates[0];
  LOG(("Fetching update url: %s\n", update.mUrl.get()));
  nsresult rv = FetchUpdate(update.mUrl,
                            EmptyCString(),
                            true, // This method is for v2 and v2 is always a POST.
                            update.mTable);
  if (NS_FAILED(rv)) {
    LOG(("Error fetching update url: %s\n", update.mUrl.get()));
    // We can commit the urls that we've applied so far.  This is
    // probably a transient server problem, so trigger backoff.
    mDownloadErrorCallback->HandleEvent(EmptyCString());
    mDownloadError = true;
    mDBService->FinishUpdate();
    return rv;
  }

  mPendingUpdates.RemoveElementAt(0);

  return NS_OK;
}

nsresult
nsUrlClassifierStreamUpdater::FetchNextRequest()
{
  if (mPendingRequests.Length() == 0) {
    LOG(("No more requests, returning"));
    return NS_OK;
  }

  PendingRequest &request = mPendingRequests[0];
  LOG(("Stream updater: fetching next request: %s, %s",
       request.mTables.get(), request.mUrl.get()));
  bool dummy;
  DownloadUpdates(
    request.mTables,
    request.mRequestPayload,
    request.mIsPostRequest,
    request.mUrl,
    request.mSuccessCallback,
    request.mUpdateErrorCallback,
    request.mDownloadErrorCallback,
    &dummy);
  request.mSuccessCallback = nullptr;
  request.mUpdateErrorCallback = nullptr;
  request.mDownloadErrorCallback = nullptr;
  mPendingRequests.RemoveElementAt(0);

  return NS_OK;
}

NS_IMETHODIMP
nsUrlClassifierStreamUpdater::StreamFinished(nsresult status,
                                             uint32_t requestedDelay)
{
  // We are a service and may not be reset with Init between calls, so reset
  // mBeganStream manually.
  mBeganStream = false;
  LOG(("nsUrlClassifierStreamUpdater::StreamFinished [%x, %d]", status, requestedDelay));
  if (NS_FAILED(status) || mPendingUpdates.Length() == 0) {
    // We're done.
    LOG(("nsUrlClassifierStreamUpdater::Done [this=%p]", this));
    mDBService->FinishUpdate();
    return NS_OK;
  }

  // This timer is for fetching indirect updates ("forwards") from any "u:" lines
  // that we encountered while processing the server response. It is NOT for
  // scheduling the next time we pull the list from the server. That's a different
  // timer in listmanager.js (see bug 1110891).
  nsresult rv;
  mTimer = do_CreateInstance("@mozilla.org/timer;1", &rv);
  if (NS_SUCCEEDED(rv)) {
    rv = mTimer->InitWithCallback(this, requestedDelay,
                                  nsITimer::TYPE_ONE_SHOT);
  }

  if (NS_FAILED(rv)) {
    NS_WARNING("Unable to initialize timer, fetching next safebrowsing item immediately");
    return FetchNext();
  }

  return NS_OK;
}

NS_IMETHODIMP
nsUrlClassifierStreamUpdater::UpdateSuccess(uint32_t requestedTimeout)
{
  LOG(("nsUrlClassifierStreamUpdater::UpdateSuccess [this=%p]", this));
  if (mPendingUpdates.Length() != 0) {
    NS_WARNING("Didn't fetch all safebrowsing update redirects");
  }

  // DownloadDone() clears mSuccessCallback, so we save it off here.
  nsCOMPtr<nsIUrlClassifierCallback> successCallback = mDownloadError ? nullptr : mSuccessCallback.get();
  DownloadDone();

  nsAutoCString strTimeout;
  strTimeout.AppendInt(requestedTimeout);
  if (successCallback) {
    LOG(("nsUrlClassifierStreamUpdater::UpdateSuccess callback [this=%p]",
         this));
    successCallback->HandleEvent(strTimeout);
  } else {
    LOG(("nsUrlClassifierStreamUpdater::UpdateSuccess skipping callback [this=%p]",
         this));
  }
  // Now fetch the next request
  LOG(("stream updater: calling into fetch next request"));
  FetchNextRequest();

  return NS_OK;
}

NS_IMETHODIMP
nsUrlClassifierStreamUpdater::UpdateError(nsresult result)
{
  LOG(("nsUrlClassifierStreamUpdater::UpdateError [this=%p]", this));

  // DownloadDone() clears mUpdateErrorCallback, so we save it off here.
  nsCOMPtr<nsIUrlClassifierCallback> errorCallback = mDownloadError ? nullptr : mUpdateErrorCallback.get();

  DownloadDone();

  nsAutoCString strResult;
  strResult.AppendInt(static_cast<uint32_t>(result));
  if (errorCallback) {
    errorCallback->HandleEvent(strResult);
  }

  return NS_OK;
}

nsresult
nsUrlClassifierStreamUpdater::AddRequestBody(const nsACString &aRequestBody)
{
  nsresult rv;
  nsCOMPtr<nsIStringInputStream> strStream =
    do_CreateInstance(NS_STRINGINPUTSTREAM_CONTRACTID, &rv);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = strStream->SetData(aRequestBody.BeginReading(),
                          aRequestBody.Length());
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<nsIUploadChannel> uploadChannel = do_QueryInterface(mChannel, &rv);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = uploadChannel->SetUploadStream(strStream,
                                      NS_LITERAL_CSTRING("text/plain"),
                                      -1);
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(mChannel, &rv);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = httpChannel->SetRequestMethod(NS_LITERAL_CSTRING("POST"));
  NS_ENSURE_SUCCESS(rv, rv);

  return NS_OK;
}

// Map the HTTP response code to a Telemetry bucket
static uint32_t HTTPStatusToBucket(uint32_t status)
{
  uint32_t statusBucket;
  switch (status) {
  case 100:
  case 101:
    // Unexpected 1xx return code
    statusBucket = 0;
    break;
  case 200:
    // OK - Data is available in the HTTP response body.
    statusBucket = 1;
    break;
  case 201:
  case 202:
  case 203:
  case 205:
  case 206:
    // Unexpected 2xx return code
    statusBucket = 2;
    break;
  case 204:
    // No Content
    statusBucket = 3;
    break;
  case 300:
  case 301:
  case 302:
  case 303:
  case 304:
  case 305:
  case 307:
  case 308:
    // Unexpected 3xx return code
    statusBucket = 4;
    break;
  case 400:
    // Bad Request - The HTTP request was not correctly formed.
    // The client did not provide all required CGI parameters.
    statusBucket = 5;
    break;
  case 401:
  case 402:
  case 405:
  case 406:
  case 407:
  case 409:
  case 410:
  case 411:
  case 412:
  case 414:
  case 415:
  case 416:
  case 417:
  case 421:
  case 426:
  case 428:
  case 429:
  case 431:
  case 451:
    // Unexpected 4xx return code
    statusBucket = 6;
    break;
  case 403:
    // Forbidden - The client id is invalid.
    statusBucket = 7;
    break;
  case 404:
    // Not Found
    statusBucket = 8;
    break;
  case 408:
    // Request Timeout
    statusBucket = 9;
    break;
  case 413:
    // Request Entity Too Large - Bug 1150334
    statusBucket = 10;
    break;
  case 500:
  case 501:
  case 510:
    // Unexpected 5xx return code
    statusBucket = 11;
    break;
  case 502:
  case 504:
  case 511:
    // Local network errors, we'll ignore these.
    statusBucket = 12;
    break;
  case 503:
    // Service Unavailable - The server cannot handle the request.
    // Clients MUST follow the backoff behavior specified in the
    // Request Frequency section.
    statusBucket = 13;
    break;
  case 505:
    // HTTP Version Not Supported - The server CANNOT handle the requested
    // protocol major version.
    statusBucket = 14;
    break;
  default:
    statusBucket = 15;
  };
  return statusBucket;
}

///////////////////////////////////////////////////////////////////////////////
// nsIStreamListenerObserver implementation

NS_IMETHODIMP
nsUrlClassifierStreamUpdater::OnStartRequest(nsIRequest *request,
                                             nsISupports* context)
{
  nsresult rv;
  bool downloadError = false;
  nsAutoCString strStatus;
  nsresult status = NS_OK;

  // Only update if we got http success header
  nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(request);
  if (httpChannel) {
    rv = httpChannel->GetStatus(&status);
    NS_ENSURE_SUCCESS(rv, rv);

    if (MOZ_LOG_TEST(gUrlClassifierStreamUpdaterLog, mozilla::LogLevel::Debug)) {
      nsAutoCString errorName, spec;
      mozilla::GetErrorName(status, errorName);
      nsCOMPtr<nsIURI> uri;
      rv = httpChannel->GetURI(getter_AddRefs(uri));
      if (NS_SUCCEEDED(rv) && uri) {
        uri->GetAsciiSpec(spec);
      }
      LOG(("nsUrlClassifierStreamUpdater::OnStartRequest "
           "(status=%s, uri=%s, this=%p)", errorName.get(),
           spec.get(), this));
    }

    if (NS_FAILED(status)) {
      // Assume we're overloading the server and trigger backoff.
      downloadError = true;
    } else {
      bool succeeded = false;
      rv = httpChannel->GetRequestSucceeded(&succeeded);
      NS_ENSURE_SUCCESS(rv, rv);

      uint32_t requestStatus;
      rv = httpChannel->GetResponseStatus(&requestStatus);
      NS_ENSURE_SUCCESS(rv, rv);
      LOG(("nsUrlClassifierStreamUpdater::OnStartRequest %s (%d)", succeeded ?
           "succeeded" : "failed", requestStatus));
      if (!succeeded) {
        // 404 or other error, pass error status back
        strStatus.AppendInt(requestStatus);
        downloadError = true;
      }
    }
  }

  if (downloadError) {
    LOG(("nsUrlClassifierStreamUpdater::Download error [this=%p]", this));

    // It's possible for mDownloadErrorCallback to be null on shutdown.
    if (mDownloadErrorCallback) {
      mDownloadErrorCallback->HandleEvent(strStatus);
    }

    mDownloadError = true;
    status = NS_ERROR_ABORT;
  } else if (NS_SUCCEEDED(status)) {
    MOZ_ASSERT(mDownloadErrorCallback);
    mBeganStream = true;
    LOG(("nsUrlClassifierStreamUpdater::Beginning stream [this=%p]", this));
    rv = mDBService->BeginStream(mStreamTable);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  mStreamTable.Truncate();

  return status;
}

NS_IMETHODIMP
nsUrlClassifierStreamUpdater::OnDataAvailable(nsIRequest *request,
                                              nsISupports* context,
                                              nsIInputStream *aIStream,
                                              uint64_t aSourceOffset,
                                              uint32_t aLength)
{
  if (!mDBService)
    return NS_ERROR_NOT_INITIALIZED;

  LOG(("OnDataAvailable (%d bytes)", aLength));

  if (aSourceOffset > MAX_FILE_SIZE) {
    LOG(("OnDataAvailable::Abort because exceeded the maximum file size(%lld)", aSourceOffset));
    return NS_ERROR_FILE_TOO_BIG;
  }

  nsresult rv;

  // Copy the data into a nsCString
  nsCString chunk;
  rv = NS_ConsumeStream(aIStream, aLength, chunk);
  NS_ENSURE_SUCCESS(rv, rv);

  //LOG(("Chunk (%d): %s\n\n", chunk.Length(), chunk.get()));
  rv = mDBService->UpdateStream(chunk);
  NS_ENSURE_SUCCESS(rv, rv);

  return NS_OK;
}

NS_IMETHODIMP
nsUrlClassifierStreamUpdater::OnStopRequest(nsIRequest *request, nsISupports* context,
                                            nsresult aStatus)
{
  if (!mDBService)
    return NS_ERROR_NOT_INITIALIZED;

  LOG(("OnStopRequest (status %x, beganStream %s, this=%p)", aStatus,
       mBeganStream ? "true" : "false", this));

  nsresult rv;

  if (NS_SUCCEEDED(aStatus)) {
    // Success, finish this stream and move on to the next.
    rv = mDBService->FinishStream();
  } else if (mBeganStream) {
    LOG(("OnStopRequest::Canceling update [this=%p]", this));
    // We began this stream and couldn't finish it.  We have to cancel the
    // update, it's not in a consistent state.
    rv = mDBService->CancelUpdate();
  } else {
    LOG(("OnStopRequest::Finishing update [this=%p]", this));
    // The fetch failed, but we didn't start the stream (probably a
    // server or connection error).  We can commit what we've applied
    // so far, and request again later.
    rv = mDBService->FinishUpdate();
  }

  mChannel = nullptr;

  // If the fetch failed, return the network status rather than NS_OK, the
  // result of finishing a possibly-empty update
  if (NS_SUCCEEDED(aStatus)) {
    return rv;
  }
  return aStatus;
}

///////////////////////////////////////////////////////////////////////////////
// nsIObserver implementation

NS_IMETHODIMP
nsUrlClassifierStreamUpdater::Observe(nsISupports *aSubject, const char *aTopic,
                                      const char16_t *aData)
{
  if (nsCRT::strcmp(aTopic, gQuitApplicationMessage) == 0) {
    if (mIsUpdating && mChannel) {
      LOG(("Cancel download"));
      nsresult rv;
      rv = mChannel->Cancel(NS_ERROR_ABORT);
      NS_ENSURE_SUCCESS(rv, rv);
      mIsUpdating = false;
      mChannel = nullptr;
    }
    if (mTimer) {
      mTimer->Cancel();
      mTimer = nullptr;
    }
  }
  return NS_OK;
}

///////////////////////////////////////////////////////////////////////////////
// nsIInterfaceRequestor implementation

NS_IMETHODIMP
nsUrlClassifierStreamUpdater::GetInterface(const nsIID & eventSinkIID, void* *_retval)
{
  return QueryInterface(eventSinkIID, _retval);
}


///////////////////////////////////////////////////////////////////////////////
// nsITimerCallback implementation
NS_IMETHODIMP
nsUrlClassifierStreamUpdater::Notify(nsITimer *timer)
{
  LOG(("nsUrlClassifierStreamUpdater::Notify [%p]", this));

  mTimer = nullptr;

  // Start the update process up again.
  FetchNext();

  return NS_OK;
}