1 files changed, 600 insertions, 0 deletions
diff --git a/dom/serviceworkers/FetchEventOpChild.cpp b/dom/serviceworkers/FetchEventOpChild.cpp
new file mode 100644
index 0000000000..e7e068a864
--- /dev/null
+++ b/dom/serviceworkers/FetchEventOpChild.cpp
@@ -0,0 +1,600 @@
+/* -*- 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 "FetchEventOpChild.h"
+
+#include <utility>
+
+#include "MainThreadUtils.h"
+#include "nsContentPolicyUtils.h"
+#include "nsContentUtils.h"
+#include "nsDebug.h"
+#include "nsError.h"
+#include "nsIChannel.h"
+#include "nsIConsoleReportCollector.h"
+#include "nsIContentPolicy.h"
+#include "nsIInputStream.h"
+#include "nsILoadInfo.h"
+#include "nsINetworkInterceptController.h"
+#include "nsIObserverService.h"
+#include "nsIScriptError.h"
+#include "nsISupportsImpl.h"
+#include "nsIURI.h"
+#include "nsNetUtil.h"
+#include "nsProxyRelease.h"
+#include "nsTArray.h"
+#include "nsThreadUtils.h"
+
+#include "ServiceWorkerPrivate.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/LoadInfo.h"
+#include "mozilla/Services.h"
+#include "mozilla/StaticPrefs_dom.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/Unused.h"
+#include "mozilla/ipc/BackgroundChild.h"
+#include "mozilla/dom/FetchService.h"
+#include "mozilla/dom/InternalHeaders.h"
+#include "mozilla/dom/InternalResponse.h"
+#include "mozilla/dom/PRemoteWorkerControllerChild.h"
+#include "mozilla/dom/ServiceWorkerRegistrationInfo.h"
+#include "mozilla/net/NeckoChannelParams.h"
+
+namespace mozilla::dom {
+
+namespace {
+
+bool CSPPermitsResponse(nsILoadInfo* aLoadInfo,
+                        SafeRefPtr<InternalResponse> aResponse,
+                        const nsACString& aWorkerScriptSpec) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(aLoadInfo);
+
+  nsCString url = aResponse->GetUnfilteredURL();
+  if (url.IsEmpty()) {
+    // Synthetic response.
+    url = aWorkerScriptSpec;
+  }
+
+  nsCOMPtr<nsIURI> uri;
+  nsresult rv = NS_NewURI(getter_AddRefs(uri), url, nullptr, nullptr);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return false;
+  }
+
+  int16_t decision = nsIContentPolicy::ACCEPT;
+  rv = NS_CheckContentLoadPolicy(uri, aLoadInfo, ""_ns, &decision);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return false;
+  }
+
+  return decision == nsIContentPolicy::ACCEPT;
+}
+
+void AsyncLog(nsIInterceptedChannel* aChannel, const nsACString& aScriptSpec,
+              uint32_t aLineNumber, uint32_t aColumnNumber,
+              const nsACString& aMessageName, nsTArray<nsString>&& aParams) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(aChannel);
+
+  nsCOMPtr<nsIConsoleReportCollector> reporter =
+      aChannel->GetConsoleReportCollector();
+
+  if (reporter) {
+    // NOTE: is appears that `const nsTArray<nsString>&` is required for
+    // nsIConsoleReportCollector::AddConsoleReport to resolve to the correct
+    // overload.
+    const nsTArray<nsString> params = std::move(aParams);
+
+    reporter->AddConsoleReport(
+        nsIScriptError::errorFlag, "Service Worker Interception"_ns,
+        nsContentUtils::eDOM_PROPERTIES, aScriptSpec, aLineNumber,
+        aColumnNumber, aMessageName, params);
+  }
+}
+
+class SynthesizeResponseWatcher final : public nsIInterceptedBodyCallback {
+ public:
+  NS_DECL_THREADSAFE_ISUPPORTS
+
+  SynthesizeResponseWatcher(
+      const nsMainThreadPtrHandle<nsIInterceptedChannel>& aInterceptedChannel,
+      const nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo>& aRegistration,
+      const bool aIsNonSubresourceRequest,
+      FetchEventRespondWithClosure&& aClosure, nsAString&& aRequestURL)
+      : mInterceptedChannel(aInterceptedChannel),
+        mRegistration(aRegistration),
+        mIsNonSubresourceRequest(aIsNonSubresourceRequest),
+        mClosure(std::move(aClosure)),
+        mRequestURL(std::move(aRequestURL)) {
+    AssertIsOnMainThread();
+    MOZ_ASSERT(mInterceptedChannel);
+    MOZ_ASSERT(mRegistration);
+  }
+
+  NS_IMETHOD
+  BodyComplete(nsresult aRv) override {
+    AssertIsOnMainThread();
+    MOZ_ASSERT(mInterceptedChannel);
+
+    if (NS_WARN_IF(NS_FAILED(aRv))) {
+      AsyncLog(mInterceptedChannel, mClosure.respondWithScriptSpec(),
+               mClosure.respondWithLineNumber(),
+               mClosure.respondWithColumnNumber(),
+               "InterceptionFailedWithURL"_ns, {mRequestURL});
+
+      CancelInterception(NS_ERROR_INTERCEPTION_FAILED);
+
+      return NS_OK;
+    }
+
+    nsresult rv = mInterceptedChannel->FinishSynthesizedResponse();
+
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      CancelInterception(rv);
+    }
+
+    mInterceptedChannel = nullptr;
+
+    return NS_OK;
+  }
+
+  // See FetchEventOpChild::MaybeScheduleRegistrationUpdate() for comments.
+  void CancelInterception(nsresult aStatus) {
+    AssertIsOnMainThread();
+    MOZ_ASSERT(mInterceptedChannel);
+    MOZ_ASSERT(mRegistration);
+
+    mInterceptedChannel->CancelInterception(aStatus);
+
+    if (mIsNonSubresourceRequest) {
+      mRegistration->MaybeScheduleUpdate();
+    } else {
+      mRegistration->MaybeScheduleTimeCheckAndUpdate();
+    }
+
+    mInterceptedChannel = nullptr;
+    mRegistration = nullptr;
+  }
+
+ private:
+  ~SynthesizeResponseWatcher() {
+    if (NS_WARN_IF(mInterceptedChannel)) {
+      CancelInterception(NS_ERROR_DOM_ABORT_ERR);
+    }
+  }
+
+  nsMainThreadPtrHandle<nsIInterceptedChannel> mInterceptedChannel;
+  nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo> mRegistration;
+  const bool mIsNonSubresourceRequest;
+  const FetchEventRespondWithClosure mClosure;
+  const nsString mRequestURL;
+};
+
+NS_IMPL_ISUPPORTS(SynthesizeResponseWatcher, nsIInterceptedBodyCallback)
+
+}  // anonymous namespace
+
+/* static */ RefPtr<GenericPromise> FetchEventOpChild::SendFetchEvent(
+    PRemoteWorkerControllerChild* aManager,
+    ParentToParentServiceWorkerFetchEventOpArgs&& aArgs,
+    nsCOMPtr<nsIInterceptedChannel> aInterceptedChannel,
+    RefPtr<ServiceWorkerRegistrationInfo> aRegistration,
+    RefPtr<FetchServicePromises>&& aPreloadResponseReadyPromises,
+    RefPtr<KeepAliveToken>&& aKeepAliveToken) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(aManager);
+  MOZ_ASSERT(aInterceptedChannel);
+  MOZ_ASSERT(aKeepAliveToken);
+
+  FetchEventOpChild* actor = new FetchEventOpChild(
+      std::move(aArgs), std::move(aInterceptedChannel),
+      std::move(aRegistration), std::move(aPreloadResponseReadyPromises),
+      std::move(aKeepAliveToken));
+
+  actor->mWasSent = true;
+  Unused << aManager->SendPFetchEventOpConstructor(actor, actor->mArgs);
+
+  return actor->mPromiseHolder.Ensure(__func__);
+}
+
+FetchEventOpChild::~FetchEventOpChild() {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mInterceptedChannelHandled);
+  MOZ_DIAGNOSTIC_ASSERT(mPromiseHolder.IsEmpty());
+}
+
+FetchEventOpChild::FetchEventOpChild(
+    ParentToParentServiceWorkerFetchEventOpArgs&& aArgs,
+    nsCOMPtr<nsIInterceptedChannel>&& aInterceptedChannel,
+    RefPtr<ServiceWorkerRegistrationInfo>&& aRegistration,
+    RefPtr<FetchServicePromises>&& aPreloadResponseReadyPromises,
+    RefPtr<KeepAliveToken>&& aKeepAliveToken)
+    : mArgs(std::move(aArgs)),
+      mInterceptedChannel(std::move(aInterceptedChannel)),
+      mRegistration(std::move(aRegistration)),
+      mKeepAliveToken(std::move(aKeepAliveToken)),
+      mPreloadResponseReadyPromises(std::move(aPreloadResponseReadyPromises)) {
+  if (mPreloadResponseReadyPromises) {
+    // This promise should be configured to use synchronous dispatch, so if it's
+    // already resolved when we run this code then the callback will be called
+    // synchronously and pass the preload response with the constructor message.
+    //
+    // Note that it's fine to capture the this pointer in the callbacks because
+    // we disconnect the request in Recv__delete__().
+    mPreloadResponseReadyPromises->GetResponseAvailablePromise()
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [this](FetchServiceResponse&& aResponse) {
+              if (!mWasSent) {
+                // The actor wasn't sent yet, we can still send the preload
+                // response with it.
+                mArgs.preloadResponse() =
+                    Some(aResponse->ToParentToParentInternalResponse());
+              } else {
+                // It's too late to send the preload response with the actor, we
+                // have to send it in a separate message.
+                SendPreloadResponse(
+                    aResponse->ToParentToParentInternalResponse());
+              }
+              mPreloadResponseAvailablePromiseRequestHolder.Complete();
+            },
+            [this](const CopyableErrorResult&) {
+              mPreloadResponseAvailablePromiseRequestHolder.Complete();
+            })
+        ->Track(mPreloadResponseAvailablePromiseRequestHolder);
+
+    mPreloadResponseReadyPromises->GetResponseEndPromise()
+        ->Then(
+            GetCurrentSerialEventTarget(), __func__,
+            [this](ResponseEndArgs&& aResponse) {
+              if (!mWasSent) {
+                // The actor wasn't sent yet, we can still send the preload
+                // response end args with it.
+                mArgs.preloadResponseEndArgs() = Some(std::move(aResponse));
+              } else {
+                // It's too late to send the preload response end with the
+                // actor, we have to send it in a separate message.
+                SendPreloadResponseEnd(aResponse);
+              }
+              mPreloadResponseReadyPromises = nullptr;
+              mPreloadResponseEndPromiseRequestHolder.Complete();
+            },
+            [this](const CopyableErrorResult&) {
+              mPreloadResponseReadyPromises = nullptr;
+              mPreloadResponseEndPromiseRequestHolder.Complete();
+            })
+        ->Track(mPreloadResponseEndPromiseRequestHolder);
+  }
+}
+
+mozilla::ipc::IPCResult FetchEventOpChild::RecvAsyncLog(
+    const nsCString& aScriptSpec, const uint32_t& aLineNumber,
+    const uint32_t& aColumnNumber, const nsCString& aMessageName,
+    nsTArray<nsString>&& aParams) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mInterceptedChannel);
+
+  AsyncLog(mInterceptedChannel, aScriptSpec, aLineNumber, aColumnNumber,
+           aMessageName, std::move(aParams));
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult FetchEventOpChild::RecvRespondWith(
+    ParentToParentFetchEventRespondWithResult&& aResult) {
+  AssertIsOnMainThread();
+
+  switch (aResult.type()) {
+    case ParentToParentFetchEventRespondWithResult::
+        TParentToParentSynthesizeResponseArgs:
+      mInterceptedChannel->SetFetchHandlerStart(
+          aResult.get_ParentToParentSynthesizeResponseArgs()
+              .timeStamps()
+              .fetchHandlerStart());
+      mInterceptedChannel->SetFetchHandlerFinish(
+          aResult.get_ParentToParentSynthesizeResponseArgs()
+              .timeStamps()
+              .fetchHandlerFinish());
+      SynthesizeResponse(
+          std::move(aResult.get_ParentToParentSynthesizeResponseArgs()));
+      break;
+    case ParentToParentFetchEventRespondWithResult::TResetInterceptionArgs:
+      mInterceptedChannel->SetFetchHandlerStart(
+          aResult.get_ResetInterceptionArgs().timeStamps().fetchHandlerStart());
+      mInterceptedChannel->SetFetchHandlerFinish(
+          aResult.get_ResetInterceptionArgs()
+              .timeStamps()
+              .fetchHandlerFinish());
+      ResetInterception(false);
+      break;
+    case ParentToParentFetchEventRespondWithResult::TCancelInterceptionArgs:
+      mInterceptedChannel->SetFetchHandlerStart(
+          aResult.get_CancelInterceptionArgs()
+              .timeStamps()
+              .fetchHandlerStart());
+      mInterceptedChannel->SetFetchHandlerFinish(
+          aResult.get_CancelInterceptionArgs()
+              .timeStamps()
+              .fetchHandlerFinish());
+      CancelInterception(aResult.get_CancelInterceptionArgs().status());
+      break;
+    default:
+      MOZ_CRASH("Unknown IPCFetchEventRespondWithResult type!");
+      break;
+  }
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult FetchEventOpChild::Recv__delete__(
+    const ServiceWorkerFetchEventOpResult& aResult) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mRegistration);
+
+  if (NS_WARN_IF(!mInterceptedChannelHandled)) {
+    MOZ_ASSERT(NS_FAILED(aResult.rv()));
+    NS_WARNING(
+        "Failed to handle intercepted network request; canceling "
+        "interception!");
+
+    CancelInterception(aResult.rv());
+  }
+
+  mPromiseHolder.ResolveIfExists(true, __func__);
+
+  // FetchEvent is completed.
+  // Disconnect preload response related promises and cancel the preload.
+  mPreloadResponseAvailablePromiseRequestHolder.DisconnectIfExists();
+  mPreloadResponseEndPromiseRequestHolder.DisconnectIfExists();
+  if (mPreloadResponseReadyPromises) {
+    RefPtr<FetchService> fetchService = FetchService::GetInstance();
+    fetchService->CancelFetch(std::move(mPreloadResponseReadyPromises));
+  }
+
+  /**
+   * This corresponds to the "Fire Functional Event" algorithm's step 9:
+   *
+   * "If the time difference in seconds calculated by the current time minus
+   * registration's last update check time is greater than 84600, invoke Soft
+   * Update algorithm with registration."
+   *
+   * TODO: this is probably being called later than it should be; it should be
+   * called ASAP after dispatching the FetchEvent.
+   */
+  mRegistration->MaybeScheduleTimeCheckAndUpdate();
+
+  return IPC_OK();
+}
+
+void FetchEventOpChild::ActorDestroy(ActorDestroyReason) {
+  AssertIsOnMainThread();
+
+  // If `Recv__delete__` was called, it would have resolved the promise already.
+  mPromiseHolder.RejectIfExists(NS_ERROR_DOM_ABORT_ERR, __func__);
+
+  if (NS_WARN_IF(!mInterceptedChannelHandled)) {
+    Unused << Recv__delete__(NS_ERROR_DOM_ABORT_ERR);
+  }
+}
+
+nsresult FetchEventOpChild::StartSynthesizedResponse(
+    ParentToParentSynthesizeResponseArgs&& aArgs) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mInterceptedChannel);
+  MOZ_ASSERT(!mInterceptedChannelHandled);
+  MOZ_ASSERT(mRegistration);
+
+  /**
+   * TODO: moving the IPCInternalResponse won't do anything right now because
+   * there isn't a prefect-forwarding or rvalue-ref-parameter overload of
+   * `InternalResponse::FromIPC().`
+   */
+  SafeRefPtr<InternalResponse> response =
+      InternalResponse::FromIPC(aArgs.internalResponse());
+  if (NS_WARN_IF(!response)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsCOMPtr<nsIChannel> underlyingChannel;
+  nsresult rv =
+      mInterceptedChannel->GetChannel(getter_AddRefs(underlyingChannel));
+  if (NS_WARN_IF(NS_FAILED(rv)) || NS_WARN_IF(!underlyingChannel)) {
+    return NS_FAILED(rv) ? rv : NS_ERROR_FAILURE;
+  }
+
+  nsCOMPtr<nsILoadInfo> loadInfo = underlyingChannel->LoadInfo();
+  if (!CSPPermitsResponse(loadInfo, response.clonePtr(),
+                          mArgs.common().workerScriptSpec())) {
+    return NS_ERROR_CONTENT_BLOCKED;
+  }
+
+  MOZ_ASSERT(response->GetChannelInfo().IsInitialized());
+  ChannelInfo channelInfo = response->GetChannelInfo();
+  rv = mInterceptedChannel->SetChannelInfo(&channelInfo);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return NS_ERROR_INTERCEPTION_FAILED;
+  }
+
+  rv = mInterceptedChannel->SynthesizeStatus(
+      response->GetUnfilteredStatus(), response->GetUnfilteredStatusText());
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  AutoTArray<InternalHeaders::Entry, 5> entries;
+  response->UnfilteredHeaders()->GetEntries(entries);
+  for (auto& entry : entries) {
+    mInterceptedChannel->SynthesizeHeader(entry.mName, entry.mValue);
+  }
+
+  auto castLoadInfo = static_cast<mozilla::net::LoadInfo*>(loadInfo.get());
+  castLoadInfo->SynthesizeServiceWorkerTainting(response->GetTainting());
+
+  // Get the preferred alternative data type of the outer channel
+  nsAutoCString preferredAltDataType(""_ns);
+  nsCOMPtr<nsICacheInfoChannel> outerChannel =
+      do_QueryInterface(underlyingChannel);
+  if (outerChannel &&
+      !outerChannel->PreferredAlternativeDataTypes().IsEmpty()) {
+    preferredAltDataType.Assign(
+        outerChannel->PreferredAlternativeDataTypes()[0].type());
+  }
+
+  nsCOMPtr<nsIInputStream> body;
+  if (preferredAltDataType.Equals(response->GetAlternativeDataType())) {
+    body = response->TakeAlternativeBody();
+  }
+  if (!body) {
+    response->GetUnfilteredBody(getter_AddRefs(body));
+  } else {
+    Telemetry::ScalarAdd(Telemetry::ScalarID::SW_ALTERNATIVE_BODY_USED_COUNT,
+                         1);
+  }
+
+  // Propagate the URL to the content if the request mode is not "navigate".
+  // Note that, we only reflect the final URL if the response.redirected is
+  // false. We propagate all the URLs if the response.redirected is true.
+  const IPCInternalRequest& request = mArgs.common().internalRequest();
+  nsAutoCString responseURL;
+  if (request.requestMode() != RequestMode::Navigate) {
+    responseURL = response->GetUnfilteredURL();
+
+    // Similar to how we apply the request fragment to redirects automatically
+    // we also want to apply it automatically when propagating the response
+    // URL from a service worker interception.  Currently response.url strips
+    // the fragment, so this will never conflict with an existing fragment
+    // on the response.  In the future we will have to check for a response
+    // fragment and avoid overriding in that case.
+    if (!request.fragment().IsEmpty() && !responseURL.IsEmpty()) {
+      MOZ_ASSERT(!responseURL.Contains('#'));
+      responseURL.AppendLiteral("#");
+      responseURL.Append(request.fragment());
+    }
+  }
+
+  nsMainThreadPtrHandle<nsIInterceptedChannel> interceptedChannel(
+      new nsMainThreadPtrHolder<nsIInterceptedChannel>(
+          "nsIInterceptedChannel", mInterceptedChannel, false));
+
+  nsMainThreadPtrHandle<ServiceWorkerRegistrationInfo> registration(
+      new nsMainThreadPtrHolder<ServiceWorkerRegistrationInfo>(
+          "ServiceWorkerRegistrationInfo", mRegistration, false));
+
+  nsCString requestURL = request.urlList().LastElement();
+  if (!request.fragment().IsEmpty()) {
+    requestURL.AppendLiteral("#");
+    requestURL.Append(request.fragment());
+  }
+
+  RefPtr<SynthesizeResponseWatcher> watcher = new SynthesizeResponseWatcher(
+      interceptedChannel, registration,
+      mArgs.common().isNonSubresourceRequest(), std::move(aArgs.closure()),
+      NS_ConvertUTF8toUTF16(responseURL));
+
+  rv = mInterceptedChannel->StartSynthesizedResponse(
+      body, watcher, nullptr /* TODO */, responseURL, response->IsRedirected());
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  nsCOMPtr<nsIObserverService> obsService = services::GetObserverService();
+  if (obsService) {
+    obsService->NotifyObservers(underlyingChannel,
+                                "service-worker-synthesized-response", nullptr);
+  }
+
+  return rv;
+}
+
+void FetchEventOpChild::SynthesizeResponse(
+    ParentToParentSynthesizeResponseArgs&& aArgs) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mInterceptedChannel);
+  MOZ_ASSERT(!mInterceptedChannelHandled);
+
+  nsresult rv = StartSynthesizedResponse(std::move(aArgs));
+
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    NS_WARNING("Failed to synthesize response!");
+
+    mInterceptedChannel->CancelInterception(rv);
+  }
+
+  mInterceptedChannelHandled = true;
+
+  MaybeScheduleRegistrationUpdate();
+}
+
+void FetchEventOpChild::ResetInterception(bool aBypass) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mInterceptedChannel);
+  MOZ_ASSERT(!mInterceptedChannelHandled);
+
+  nsresult rv = mInterceptedChannel->ResetInterception(aBypass);
+
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    NS_WARNING("Failed to resume intercepted network request!");
+
+    mInterceptedChannel->CancelInterception(rv);
+  }
+
+  mInterceptedChannelHandled = true;
+
+  MaybeScheduleRegistrationUpdate();
+}
+
+void FetchEventOpChild::CancelInterception(nsresult aStatus) {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mInterceptedChannel);
+  MOZ_ASSERT(!mInterceptedChannelHandled);
+  MOZ_ASSERT(NS_FAILED(aStatus));
+
+  // Report a navigation fault if this is a navigation (and we have an active
+  // worker, which should be the case in non-shutdown/content-process-crash
+  // situations).
+  RefPtr<ServiceWorkerInfo> mActive = mRegistration->GetActive();
+  if (mActive && mArgs.common().isNonSubresourceRequest()) {
+    mActive->ReportNavigationFault();
+    // Additional mitigations such as unregistering the registration are handled
+    // in ServiceWorkerRegistrationInfo::MaybeScheduleUpdate which will be
+    // called by MaybeScheduleRegistrationUpdate which gets called by our call
+    // to ResetInterception.
+    if (StaticPrefs::dom_serviceWorkers_mitigations_bypass_on_fault()) {
+      ResetInterception(true);
+      return;
+    }
+  }
+
+  mInterceptedChannel->CancelInterception(aStatus);
+  mInterceptedChannelHandled = true;
+
+  MaybeScheduleRegistrationUpdate();
+}
+
+/**
+ * This corresponds to the "Handle Fetch" algorithm's steps 20.3, 21.2, and
+ * 22.2:
+ *
+ * "If request is a non-subresource request, or request is a subresource
+ * request and the time difference in seconds calculated by the current time
+ * minus registration's last update check time is greater than 86400, invoke
+ * Soft Update algorithm with registration."
+ */
+void FetchEventOpChild::MaybeScheduleRegistrationUpdate() const {
+  AssertIsOnMainThread();
+  MOZ_ASSERT(mRegistration);
+  MOZ_ASSERT(mInterceptedChannelHandled);
+
+  if (mArgs.common().isNonSubresourceRequest()) {
+    mRegistration->MaybeScheduleUpdate();
+  } else {
+    mRegistration->MaybeScheduleTimeCheckAndUpdate();
+  }
+}
+
+}  // namespace mozilla::dom