summaryrefslogtreecommitdiffstats
path: root/dom/fetch/Request.cpp
blob: f1ae053b9877ba25569566eb805cb69cad879ef8 (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
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "Request.h"

#include "js/Value.h"
#include "nsIURI.h"
#include "nsNetUtil.h"
#include "nsPIDOMWindow.h"

#include "mozilla/ErrorResult.h"
#include "mozilla/StaticPrefs_network.h"
#include "mozilla/dom/Headers.h"
#include "mozilla/dom/Fetch.h"
#include "mozilla/dom/FetchUtil.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/URL.h"
#include "mozilla/dom/WorkerPrivate.h"
#include "mozilla/dom/WorkerRunnable.h"
#include "mozilla/dom/WindowContext.h"
#include "mozilla/ipc/PBackgroundSharedTypes.h"
#include "mozilla/Unused.h"

#include "mozilla/dom/ReadableStreamDefaultReader.h"

namespace mozilla::dom {

NS_IMPL_ADDREF_INHERITED(Request, FetchBody<Request>)
NS_IMPL_RELEASE_INHERITED(Request, FetchBody<Request>)

// Can't use _INHERITED macro here because FetchBody<Request> is abstract.
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(Request)

NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(Request, FetchBody<Request>)
  NS_IMPL_CYCLE_COLLECTION_UNLINK(mOwner)
  NS_IMPL_CYCLE_COLLECTION_UNLINK(mHeaders)
  NS_IMPL_CYCLE_COLLECTION_UNLINK(mSignal)
  NS_IMPL_CYCLE_COLLECTION_UNLINK(mFetchStreamReader)
  NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_UNLINK_END

NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(Request, FetchBody<Request>)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOwner)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mHeaders)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSignal)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mFetchStreamReader)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Request)
  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_END_INHERITING(FetchBody<Request>)

Request::Request(nsIGlobalObject* aOwner, SafeRefPtr<InternalRequest> aRequest,
                 AbortSignal* aSignal)
    : FetchBody<Request>(aOwner), mRequest(std::move(aRequest)) {
  MOZ_ASSERT(mRequest->Headers()->Guard() == HeadersGuardEnum::Immutable ||
             mRequest->Headers()->Guard() == HeadersGuardEnum::Request ||
             mRequest->Headers()->Guard() == HeadersGuardEnum::Request_no_cors);
  if (aSignal) {
    // If we don't have a signal as argument, we will create it when required by
    // content, otherwise the Request's signal must follow what has been passed.
    JS::Rooted<JS::Value> reason(RootingCx(), aSignal->RawReason());
    mSignal = new AbortSignal(aOwner, aSignal->Aborted(), reason);
    if (!mSignal->Aborted()) {
      mSignal->Follow(aSignal);
    }
  }
}

Request::~Request() = default;

SafeRefPtr<InternalRequest> Request::GetInternalRequest() {
  return mRequest.clonePtr();
}

namespace {
already_AddRefed<nsIURI> ParseURLFromDocument(Document* aDocument,
                                              const nsACString& aInput,
                                              ErrorResult& aRv) {
  MOZ_ASSERT(aDocument);
  MOZ_ASSERT(NS_IsMainThread());

  nsCOMPtr<nsIURI> resolvedURI;
  nsresult rv = NS_NewURI(getter_AddRefs(resolvedURI), aInput, nullptr,
                          aDocument->GetBaseURI());
  if (NS_WARN_IF(NS_FAILED(rv))) {
    aRv.ThrowTypeError<MSG_INVALID_URL>(aInput);
  }
  return resolvedURI.forget();
}
void GetRequestURLFromDocument(Document* aDocument, const nsACString& aInput,
                               nsACString& aRequestURL,
                               nsACString& aURLfragment, ErrorResult& aRv) {
  nsCOMPtr<nsIURI> resolvedURI = ParseURLFromDocument(aDocument, aInput, aRv);
  if (aRv.Failed()) {
    return;
  }
  // This fails with URIs with weird protocols, even when they are valid,
  // so we ignore the failure
  nsAutoCString credentials;
  Unused << resolvedURI->GetUserPass(credentials);
  if (!credentials.IsEmpty()) {
    aRv.ThrowTypeError<MSG_URL_HAS_CREDENTIALS>(aInput);
    return;
  }

  nsCOMPtr<nsIURI> resolvedURIClone;
  aRv = NS_GetURIWithoutRef(resolvedURI, getter_AddRefs(resolvedURIClone));
  if (NS_WARN_IF(aRv.Failed())) {
    return;
  }
  aRv = resolvedURIClone->GetSpec(aRequestURL);
  if (NS_WARN_IF(aRv.Failed())) {
    return;
  }

  // Get the fragment from nsIURI.
  aRv = resolvedURI->GetRef(aURLfragment);
  if (NS_WARN_IF(aRv.Failed())) {
    return;
  }
}
already_AddRefed<nsIURI> ParseURLFromChrome(const nsACString& aInput,
                                            ErrorResult& aRv) {
  MOZ_ASSERT(NS_IsMainThread());

  nsCOMPtr<nsIURI> uri;
  nsresult rv = NS_NewURI(getter_AddRefs(uri), aInput);
  if (NS_FAILED(rv)) {
    aRv.ThrowTypeError<MSG_INVALID_URL>(aInput);
  }
  return uri.forget();
}
void GetRequestURLFromChrome(const nsACString& aInput, nsACString& aRequestURL,
                             nsACString& aURLfragment, ErrorResult& aRv) {
  nsCOMPtr<nsIURI> uri = ParseURLFromChrome(aInput, aRv);
  if (aRv.Failed()) {
    return;
  }
  // This fails with URIs with weird protocols, even when they are valid,
  // so we ignore the failure
  nsAutoCString credentials;
  Unused << uri->GetUserPass(credentials);
  if (!credentials.IsEmpty()) {
    aRv.ThrowTypeError<MSG_URL_HAS_CREDENTIALS>(aInput);
    return;
  }

  nsCOMPtr<nsIURI> uriClone;
  aRv = NS_GetURIWithoutRef(uri, getter_AddRefs(uriClone));
  if (NS_WARN_IF(aRv.Failed())) {
    return;
  }
  aRv = uriClone->GetSpec(aRequestURL);
  if (NS_WARN_IF(aRv.Failed())) {
    return;
  }

  // Get the fragment from nsIURI.
  aRv = uri->GetRef(aURLfragment);
  if (NS_WARN_IF(aRv.Failed())) {
    return;
  }
}
already_AddRefed<URL> ParseURLFromWorker(nsIGlobalObject* aGlobal,
                                         const nsACString& aInput,
                                         ErrorResult& aRv) {
  WorkerPrivate* worker = GetCurrentThreadWorkerPrivate();
  MOZ_ASSERT(worker);
  worker->AssertIsOnWorkerThread();

  const auto& baseURL = worker->GetLocationInfo().mHref;
  RefPtr<URL> url = URL::Constructor(aGlobal, aInput, baseURL, aRv);
  if (NS_WARN_IF(aRv.Failed())) {
    aRv.ThrowTypeError<MSG_INVALID_URL>(aInput);
  }
  return url.forget();
}
void GetRequestURLFromWorker(nsIGlobalObject* aGlobal, const nsACString& aInput,
                             nsACString& aRequestURL, nsACString& aURLfragment,
                             ErrorResult& aRv) {
  RefPtr<URL> url = ParseURLFromWorker(aGlobal, aInput, aRv);
  if (aRv.Failed()) {
    return;
  }
  nsCString username;
  url->GetUsername(username);

  nsCString password;
  url->GetPassword(password);

  if (!username.IsEmpty() || !password.IsEmpty()) {
    aRv.ThrowTypeError<MSG_URL_HAS_CREDENTIALS>(aInput);
    return;
  }

  // Get the fragment from URL.
  nsAutoCString fragment;
  url->GetHash(fragment);

  // Note: URL::GetHash() includes the "#" and we want the fragment with out
  // the hash symbol.
  if (!fragment.IsEmpty()) {
    aURLfragment = Substring(fragment, 1);
  }

  url->SetHash(""_ns);
  url->GetHref(aRequestURL);
}

class ReferrerSameOriginChecker final : public WorkerMainThreadRunnable {
 public:
  ReferrerSameOriginChecker(WorkerPrivate* aWorkerPrivate,
                            const nsACString& aReferrerURL, nsresult& aResult)
      : WorkerMainThreadRunnable(aWorkerPrivate,
                                 "Fetch :: Referrer same origin check"_ns),
        mReferrerURL(aReferrerURL),
        mResult(aResult) {
    mWorkerPrivate->AssertIsOnWorkerThread();
  }

  bool MainThreadRun() override {
    nsCOMPtr<nsIURI> uri;
    if (NS_SUCCEEDED(NS_NewURI(getter_AddRefs(uri), mReferrerURL))) {
      if (nsCOMPtr<nsIPrincipal> principal = mWorkerPrivate->GetPrincipal()) {
        mResult = principal->CheckMayLoad(uri,
                                          /* allowIfInheritsPrincipal */ false);
      }
    }
    return true;
  }

 private:
  const nsCString mReferrerURL;
  nsresult& mResult;
};

}  // namespace

/*static*/
SafeRefPtr<Request> Request::Constructor(const GlobalObject& aGlobal,
                                         const RequestOrUTF8String& aInput,
                                         const RequestInit& aInit,
                                         ErrorResult& aRv) {
  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(aGlobal.GetAsSupports());
  return Constructor(global, aGlobal.Context(), aInput, aInit,
                     aGlobal.CallerType(), aRv);
}

/*static*/
SafeRefPtr<Request> Request::Constructor(
    nsIGlobalObject* aGlobal, JSContext* aCx, const RequestOrUTF8String& aInput,
    const RequestInit& aInit, CallerType aCallerType, ErrorResult& aRv) {
  bool hasCopiedBody = false;
  SafeRefPtr<InternalRequest> request;

  RefPtr<AbortSignal> signal;
  bool bodyFromInit = false;

  if (aInput.IsRequest()) {
    RefPtr<Request> inputReq = &aInput.GetAsRequest();
    nsCOMPtr<nsIInputStream> body;

    if (aInit.mBody.WasPassed() && !aInit.mBody.Value().IsNull()) {
      bodyFromInit = true;
      hasCopiedBody = true;
    } else {
      inputReq->GetBody(getter_AddRefs(body));
      if (inputReq->BodyUsed()) {
        aRv.ThrowTypeError<MSG_FETCH_BODY_CONSUMED_ERROR>();
        return nullptr;
      }

      // The body will be copied when GetRequestConstructorCopy() is executed.
      if (body) {
        hasCopiedBody = true;
      }
    }

    request = inputReq->GetInternalRequest();
    signal = inputReq->GetOrCreateSignal();
  } else {
    // aInput is UTF8String.
    // We need to get url before we create a InternalRequest.
    const nsACString& input = aInput.GetAsUTF8String();
    nsAutoCString requestURL;
    nsCString fragment;
    if (NS_IsMainThread()) {
      nsCOMPtr<nsPIDOMWindowInner> inner(do_QueryInterface(aGlobal));
      Document* doc = inner ? inner->GetExtantDoc() : nullptr;
      if (doc) {
        GetRequestURLFromDocument(doc, input, requestURL, fragment, aRv);
      } else {
        // If we don't have a document, we must assume that this is a full URL.
        GetRequestURLFromChrome(input, requestURL, fragment, aRv);
      }
    } else {
      GetRequestURLFromWorker(aGlobal, input, requestURL, fragment, aRv);
    }
    if (aRv.Failed()) {
      return nullptr;
    }
    request = MakeSafeRefPtr<InternalRequest>(requestURL, fragment);
  }
  request = request->GetRequestConstructorCopy(aGlobal, aRv);
  if (NS_WARN_IF(aRv.Failed())) {
    return nullptr;
  }
  Maybe<RequestMode> mode;
  if (aInit.mMode.WasPassed()) {
    if (aInit.mMode.Value() == RequestMode::Navigate) {
      aRv.ThrowTypeError<MSG_INVALID_REQUEST_MODE>("navigate");
      return nullptr;
    }

    mode.emplace(aInit.mMode.Value());
  }
  Maybe<RequestCredentials> credentials;
  if (aInit.mCredentials.WasPassed()) {
    credentials.emplace(aInit.mCredentials.Value());
  }
  Maybe<RequestCache> cache;
  if (aInit.mCache.WasPassed()) {
    cache.emplace(aInit.mCache.Value());
  }
  if (aInput.IsUTF8String()) {
    if (mode.isNothing()) {
      mode.emplace(RequestMode::Cors);
    }
    if (credentials.isNothing()) {
      if (aCallerType == CallerType::System &&
          StaticPrefs::network_fetch_systemDefaultsToOmittingCredentials()) {
        credentials.emplace(RequestCredentials::Omit);
      } else {
        credentials.emplace(RequestCredentials::Same_origin);
      }
    }
    if (cache.isNothing()) {
      cache.emplace(RequestCache::Default);
    }
  }

  if (aInit.IsAnyMemberPresent() && request->Mode() == RequestMode::Navigate) {
    mode = Some(RequestMode::Same_origin);
  }

  if (aInit.IsAnyMemberPresent()) {
    request->SetReferrer(nsLiteralCString(kFETCH_CLIENT_REFERRER_STR));
    request->SetReferrerPolicy(ReferrerPolicy::_empty);
  }
  if (aInit.mReferrer.WasPassed()) {
    const nsCString& referrer = aInit.mReferrer.Value();
    if (referrer.IsEmpty()) {
      request->SetReferrer(""_ns);
    } else {
      nsAutoCString referrerURL;
      if (NS_IsMainThread()) {
        nsCOMPtr<nsPIDOMWindowInner> inner(do_QueryInterface(aGlobal));
        Document* doc = inner ? inner->GetExtantDoc() : nullptr;
        nsCOMPtr<nsIURI> uri;
        if (doc) {
          uri = ParseURLFromDocument(doc, referrer, aRv);
        } else {
          // If we don't have a document, we must assume that this is a full
          // URL.
          uri = ParseURLFromChrome(referrer, aRv);
        }
        if (NS_WARN_IF(aRv.Failed())) {
          aRv.ThrowTypeError<MSG_INVALID_REFERRER_URL>(referrer);
          return nullptr;
        }
        uri->GetSpec(referrerURL);
        if (!referrerURL.EqualsLiteral(kFETCH_CLIENT_REFERRER_STR)) {
          nsCOMPtr<nsIPrincipal> principal = aGlobal->PrincipalOrNull();
          if (principal) {
            nsresult rv =
                principal->CheckMayLoad(uri,
                                        /* allowIfInheritsPrincipal */ false);
            if (NS_FAILED(rv)) {
              referrerURL.AssignLiteral(kFETCH_CLIENT_REFERRER_STR);
            }
          }
        }
      } else {
        RefPtr<URL> url = ParseURLFromWorker(aGlobal, referrer, aRv);
        if (NS_WARN_IF(aRv.Failed())) {
          aRv.ThrowTypeError<MSG_INVALID_REFERRER_URL>(referrer);
          return nullptr;
        }
        url->GetHref(referrerURL);
        if (!referrerURL.EqualsLiteral(kFETCH_CLIENT_REFERRER_STR)) {
          WorkerPrivate* worker = GetCurrentThreadWorkerPrivate();
          nsresult rv = NS_OK;
          // ReferrerSameOriginChecker uses a sync loop to get the main thread
          // to perform the same-origin check.  Overall, on Workers this method
          // can create 3 sync loops (two for constructing URLs and one here) so
          // in the future we may want to optimize it all by off-loading all of
          // this work in a single sync loop.
          RefPtr<ReferrerSameOriginChecker> checker =
              new ReferrerSameOriginChecker(worker, referrerURL, rv);
          IgnoredErrorResult error;
          checker->Dispatch(Canceling, error);
          if (error.Failed() || NS_FAILED(rv)) {
            referrerURL.AssignLiteral(kFETCH_CLIENT_REFERRER_STR);
          }
        }
      }
      request->SetReferrer(referrerURL);
    }
  }

  if (aInit.mReferrerPolicy.WasPassed()) {
    request->SetReferrerPolicy(aInit.mReferrerPolicy.Value());
  }

  if (aInit.mSignal.WasPassed()) {
    signal = aInit.mSignal.Value();
  }

  // https://fetch.spec.whatwg.org/#dom-global-fetch
  // https://fetch.spec.whatwg.org/#dom-request
  // The priority of init overrides input's priority.
  if (aInit.mPriority.WasPassed()) {
    request->SetPriorityMode(aInit.mPriority.Value());
  }

  UniquePtr<mozilla::ipc::PrincipalInfo> principalInfo;
  nsILoadInfo::CrossOriginEmbedderPolicy coep =
      nsILoadInfo::EMBEDDER_POLICY_NULL;

  if (NS_IsMainThread()) {
    nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(aGlobal);
    if (window) {
      nsCOMPtr<Document> doc;
      doc = window->GetExtantDoc();
      if (doc) {
        request->SetEnvironmentReferrerPolicy(doc->GetReferrerPolicy());

        principalInfo.reset(new mozilla::ipc::PrincipalInfo());
        nsresult rv =
            PrincipalToPrincipalInfo(doc->NodePrincipal(), principalInfo.get());
        if (NS_WARN_IF(NS_FAILED(rv))) {
          aRv.ThrowTypeError<MSG_FETCH_BODY_CONSUMED_ERROR>();
          return nullptr;
        }
      }
      if (window->GetWindowContext()) {
        coep = window->GetWindowContext()->GetEmbedderPolicy();
      }
    }
  } else {
    WorkerPrivate* worker = GetCurrentThreadWorkerPrivate();
    if (worker) {
      worker->AssertIsOnWorkerThread();
      request->SetEnvironmentReferrerPolicy(worker->GetReferrerPolicy());
      principalInfo =
          MakeUnique<mozilla::ipc::PrincipalInfo>(worker->GetPrincipalInfo());
      coep = worker->GetEmbedderPolicy();
      // For dedicated worker, the response must respect the owner's COEP.
      if (coep == nsILoadInfo::EMBEDDER_POLICY_NULL &&
          worker->IsDedicatedWorker()) {
        coep = worker->GetOwnerEmbedderPolicy();
      }
    }
  }

  request->SetPrincipalInfo(std::move(principalInfo));
  request->SetEmbedderPolicy(coep);

  if (mode.isSome()) {
    request->SetMode(mode.value());
  }

  if (credentials.isSome()) {
    request->SetCredentialsMode(credentials.value());
  }

  if (cache.isSome()) {
    if (cache.value() == RequestCache::Only_if_cached &&
        request->Mode() != RequestMode::Same_origin) {
      aRv.ThrowTypeError<MSG_ONLY_IF_CACHED_WITHOUT_SAME_ORIGIN>(
          GetEnumString(request->Mode()));
      return nullptr;
    }
    request->SetCacheMode(cache.value());
  }

  if (aInit.mRedirect.WasPassed()) {
    request->SetRedirectMode(aInit.mRedirect.Value());
  }

  if (aInit.mIntegrity.WasPassed()) {
    request->SetIntegrity(aInit.mIntegrity.Value());
  }

  if (aInit.mKeepalive.WasPassed()) {
    request->SetKeepalive(aInit.mKeepalive.Value());
  }

  if (aInit.mMozErrors.WasPassed() && aInit.mMozErrors.Value()) {
    request->SetMozErrors();
  }

  // Request constructor step 14.
  if (aInit.mMethod.WasPassed()) {
    nsAutoCString method(aInit.mMethod.Value());

    // Step 14.1. Disallow forbidden methods, and anything that is not a HTTP
    // token, since HTTP states that Method may be any of the defined values or
    // a token (extension method).
    nsAutoCString outMethod;
    nsresult rv = FetchUtil::GetValidRequestMethod(method, outMethod);
    if (NS_FAILED(rv)) {
      aRv.ThrowTypeError<MSG_INVALID_REQUEST_METHOD>(method);
      return nullptr;
    }

    // Step 14.2
    request->SetMethod(outMethod);
  }

  RefPtr<InternalHeaders> requestHeaders = request->Headers();

  RefPtr<InternalHeaders> headers;
  if (aInit.mHeaders.WasPassed()) {
    RefPtr<Headers> h = Headers::Create(aGlobal, aInit.mHeaders.Value(), aRv);
    if (aRv.Failed()) {
      return nullptr;
    }
    headers = h->GetInternalHeaders();
  } else {
    headers = new InternalHeaders(*requestHeaders);
  }

  requestHeaders->Clear();
  // From "Let r be a new Request object associated with request and a new
  // Headers object whose guard is "request"."
  requestHeaders->SetGuard(HeadersGuardEnum::Request, aRv);
  MOZ_ASSERT(!aRv.Failed());

  if (request->Mode() == RequestMode::No_cors) {
    if (!request->HasSimpleMethod()) {
      nsAutoCString method;
      request->GetMethod(method);
      aRv.ThrowTypeError<MSG_INVALID_REQUEST_METHOD>(method);
      return nullptr;
    }

    requestHeaders->SetGuard(HeadersGuardEnum::Request_no_cors, aRv);
    if (aRv.Failed()) {
      return nullptr;
    }
  }

  requestHeaders->Fill(*headers, aRv);
  if (aRv.Failed()) {
    return nullptr;
  }

  if ((aInit.mBody.WasPassed() && !aInit.mBody.Value().IsNull()) ||
      hasCopiedBody) {
    // HEAD and GET are not allowed to have a body.
    nsAutoCString method;
    request->GetMethod(method);
    // method is guaranteed to be uppercase due to step 14.2 above.
    if (method.EqualsLiteral("HEAD") || method.EqualsLiteral("GET")) {
      aRv.ThrowTypeError("HEAD or GET Request cannot have a body.");
      return nullptr;
    }
  }

  if (aInit.mBody.WasPassed()) {
    const Nullable<fetch::OwningBodyInit>& bodyInitNullable =
        aInit.mBody.Value();
    if (!bodyInitNullable.IsNull()) {
      const fetch::OwningBodyInit& bodyInit = bodyInitNullable.Value();
      nsCOMPtr<nsIInputStream> stream;
      nsAutoCString contentTypeWithCharset;
      uint64_t contentLength = 0;
      aRv = ExtractByteStreamFromBody(bodyInit, getter_AddRefs(stream),
                                      contentTypeWithCharset, contentLength);
      if (NS_WARN_IF(aRv.Failed())) {
        return nullptr;
      }

      nsCOMPtr<nsIInputStream> temporaryBody = stream;

      if (!contentTypeWithCharset.IsVoid() &&
          !requestHeaders->Has("Content-Type"_ns, aRv)) {
        requestHeaders->Append("Content-Type"_ns, contentTypeWithCharset, aRv);
      }

      if (NS_WARN_IF(aRv.Failed())) {
        return nullptr;
      }

      if (hasCopiedBody) {
        request->SetBody(nullptr, 0);
      }

      request->SetBody(temporaryBody, contentLength);
    }
  }

  auto domRequest =
      MakeSafeRefPtr<Request>(aGlobal, std::move(request), signal);

  if (aInput.IsRequest() && !bodyFromInit) {
    RefPtr<Request> inputReq = &aInput.GetAsRequest();
    nsCOMPtr<nsIInputStream> body;
    inputReq->GetBody(getter_AddRefs(body));
    if (body) {
      inputReq->SetBody(nullptr, 0);
      inputReq->SetBodyUsed(aCx, aRv);
      if (NS_WARN_IF(aRv.Failed())) {
        return nullptr;
      }
    }
  }
  return domRequest;
}

SafeRefPtr<Request> Request::Clone(ErrorResult& aRv) {
  if (BodyUsed()) {
    aRv.ThrowTypeError<MSG_FETCH_BODY_CONSUMED_ERROR>();
    return nullptr;
  }

  SafeRefPtr<InternalRequest> ir = mRequest->Clone();
  if (!ir) {
    aRv.Throw(NS_ERROR_FAILURE);
    return nullptr;
  }

  return MakeSafeRefPtr<Request>(mOwner, std::move(ir), GetOrCreateSignal());
}

Headers* Request::Headers_() {
  if (!mHeaders) {
    mHeaders = new Headers(mOwner, mRequest->Headers());
  }

  return mHeaders;
}

AbortSignal* Request::GetOrCreateSignal() {
  if (!mSignal) {
    mSignal = new AbortSignal(mOwner, false, JS::UndefinedHandleValue);
  }

  return mSignal;
}

AbortSignalImpl* Request::GetSignalImpl() const { return mSignal; }

AbortSignalImpl* Request::GetSignalImplToConsumeBody() const {
  // This is a hack, see Response::GetSignalImplToConsumeBody.
  return nullptr;
}

}  // namespace mozilla::dom