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/* -*- 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
#include "ServiceWorkerScriptCache.h"
#include "js/Array.h" // JS::GetArrayLength
#include "js/PropertyAndElement.h" // JS_GetElement
#include "js/Utility.h" // JS::FreePolicy
#include "mozilla/TaskQueue.h"
#include "mozilla/Unused.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/dom/CacheBinding.h"
#include "mozilla/dom/cache/CacheStorage.h"
#include "mozilla/dom/cache/Cache.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/PromiseWorkerProxy.h"
#include "mozilla/dom/ScriptLoader.h"
#include "mozilla/dom/WorkerCommon.h"
#include "mozilla/ipc/BackgroundUtils.h"
#include "mozilla/ipc/PBackgroundSharedTypes.h"
#include "mozilla/net/CookieJarSettings.h"
#include "mozilla/ScopeExit.h"
#include "mozilla/StaticPrefs_extensions.h"
#include "nsICacheInfoChannel.h"
#include "nsIHttpChannel.h"
#include "nsIStreamLoader.h"
#include "nsIThreadRetargetableRequest.h"
#include "nsIUUIDGenerator.h"
#include "nsIXPConnect.h"
#include "nsIInputStreamPump.h"
#include "nsIPrincipal.h"
#include "nsIScriptSecurityManager.h"
#include "nsContentUtils.h"
#include "nsNetUtil.h"
#include "ServiceWorkerManager.h"
#include "nsStringStream.h"
using mozilla::dom::cache::Cache;
using mozilla::dom::cache::CacheStorage;
using mozilla::ipc::PrincipalInfo;
namespace mozilla::dom::serviceWorkerScriptCache {
namespace {
already_AddRefed<CacheStorage> CreateCacheStorage(JSContext* aCx,
nsIPrincipal* aPrincipal,
ErrorResult& aRv) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aPrincipal);
nsIXPConnect* xpc = nsContentUtils::XPConnect();
MOZ_ASSERT(xpc, "This should never be null!");
JS::Rooted<JSObject*> sandbox(aCx);
aRv = xpc->CreateSandbox(aCx, aPrincipal, sandbox.address());
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
// This is called when the JSContext is not in a realm, so CreateSandbox
// returned an unwrapped global.
MOZ_ASSERT(JS_IsGlobalObject(sandbox));
nsCOMPtr<nsIGlobalObject> sandboxGlobalObject = xpc::NativeGlobal(sandbox);
if (!sandboxGlobalObject) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
// We assume private browsing is not enabled here. The ScriptLoader
// explicitly fails for private browsing so there should never be
// a service worker running in private browsing mode. Therefore if
// we are purging scripts or running a comparison algorithm we cannot
// be in private browsing.
//
// Also, bypass the CacheStorage trusted origin checks. The ServiceWorker
// has validated the origin prior to this point. All the information
// to revalidate is not available now.
return CacheStorage::CreateOnMainThread(cache::CHROME_ONLY_NAMESPACE,
sandboxGlobalObject, aPrincipal,
true /* force trusted origin */, aRv);
}
class CompareManager;
class CompareCache;
// This class downloads a URL from the network, compare the downloaded script
// with an existing cache if provided, and report to CompareManager via calling
// ComparisonFinished().
class CompareNetwork final : public nsIStreamLoaderObserver,
public nsIRequestObserver {
public:
NS_DECL_ISUPPORTS
NS_DECL_NSISTREAMLOADEROBSERVER
NS_DECL_NSIREQUESTOBSERVER
CompareNetwork(CompareManager* aManager,
ServiceWorkerRegistrationInfo* aRegistration,
bool aIsMainScript)
: mManager(aManager),
mRegistration(aRegistration),
mInternalHeaders(new InternalHeaders()),
mLoadFlags(nsIChannel::LOAD_BYPASS_SERVICE_WORKER),
mState(WaitingForInitialization),
mNetworkResult(NS_OK),
mCacheResult(NS_OK),
mIsMainScript(aIsMainScript),
mIsFromCache(false) {
MOZ_ASSERT(aManager);
MOZ_ASSERT(NS_IsMainThread());
}
nsresult Initialize(nsIPrincipal* aPrincipal, const nsACString& aURL,
Cache* const aCache);
void Abort();
void NetworkFinish(nsresult aRv);
void CacheFinish(nsresult aRv);
const nsCString& URL() const {
MOZ_ASSERT(NS_IsMainThread());
return mURL;
}
const nsString& Buffer() const {
MOZ_ASSERT(NS_IsMainThread());
return mBuffer;
}
const ChannelInfo& GetChannelInfo() const { return mChannelInfo; }
already_AddRefed<InternalHeaders> GetInternalHeaders() const {
RefPtr<InternalHeaders> internalHeaders = mInternalHeaders;
return internalHeaders.forget();
}
UniquePtr<PrincipalInfo> TakePrincipalInfo() {
return std::move(mPrincipalInfo);
}
bool Succeeded() const { return NS_SUCCEEDED(mNetworkResult); }
const nsTArray<nsCString>& URLList() const { return mURLList; }
private:
~CompareNetwork() {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(!mCC);
}
void Finish();
nsresult SetPrincipalInfo(nsIChannel* aChannel);
RefPtr<CompareManager> mManager;
RefPtr<CompareCache> mCC;
RefPtr<ServiceWorkerRegistrationInfo> mRegistration;
nsCOMPtr<nsIChannel> mChannel;
nsString mBuffer;
nsCString mURL;
ChannelInfo mChannelInfo;
RefPtr<InternalHeaders> mInternalHeaders;
UniquePtr<PrincipalInfo> mPrincipalInfo;
nsTArray<nsCString> mURLList;
nsCString mMaxScope;
nsLoadFlags mLoadFlags;
enum {
WaitingForInitialization,
WaitingForBothFinished,
WaitingForNetworkFinished,
WaitingForCacheFinished,
Finished
} mState;
nsresult mNetworkResult;
nsresult mCacheResult;
const bool mIsMainScript;
bool mIsFromCache;
};
NS_IMPL_ISUPPORTS(CompareNetwork, nsIStreamLoaderObserver, nsIRequestObserver)
// This class gets a cached Response from the CacheStorage and then it calls
// CacheFinish() in the CompareNetwork.
class CompareCache final : public PromiseNativeHandler,
public nsIStreamLoaderObserver {
public:
NS_DECL_ISUPPORTS
NS_DECL_NSISTREAMLOADEROBSERVER
explicit CompareCache(CompareNetwork* aCN)
: mCN(aCN), mState(WaitingForInitialization), mInCache(false) {
MOZ_ASSERT(aCN);
MOZ_ASSERT(NS_IsMainThread());
}
nsresult Initialize(Cache* const aCache, const nsACString& aURL);
void Finish(nsresult aStatus, bool aInCache);
void Abort();
virtual void ResolvedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
ErrorResult& aRv) override;
virtual void RejectedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
ErrorResult& aRv) override;
const nsString& Buffer() const {
MOZ_ASSERT(NS_IsMainThread());
return mBuffer;
}
bool InCache() { return mInCache; }
private:
~CompareCache() { MOZ_ASSERT(NS_IsMainThread()); }
void ManageValueResult(JSContext* aCx, JS::Handle<JS::Value> aValue);
RefPtr<CompareNetwork> mCN;
nsCOMPtr<nsIInputStreamPump> mPump;
nsCString mURL;
nsString mBuffer;
enum {
WaitingForInitialization,
WaitingForScript,
Finished,
} mState;
bool mInCache;
};
NS_IMPL_ISUPPORTS(CompareCache, nsIStreamLoaderObserver)
class CompareManager final : public PromiseNativeHandler {
public:
NS_DECL_ISUPPORTS
explicit CompareManager(ServiceWorkerRegistrationInfo* aRegistration,
CompareCallback* aCallback)
: mRegistration(aRegistration),
mCallback(aCallback),
mLoadFlags(nsIChannel::LOAD_BYPASS_SERVICE_WORKER),
mState(WaitingForInitialization),
mPendingCount(0),
mOnFailure(OnFailure::DoNothing),
mAreScriptsEqual(true) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aRegistration);
}
nsresult Initialize(nsIPrincipal* aPrincipal, const nsACString& aURL,
const nsAString& aCacheName);
void ResolvedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
ErrorResult& aRv) override;
void RejectedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
ErrorResult& aRv) override;
CacheStorage* CacheStorage_() {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(mCacheStorage);
return mCacheStorage;
}
void ComparisonFinished(nsresult aStatus, bool aIsMainScript, bool aIsEqual,
const nsACString& aMaxScope, nsLoadFlags aLoadFlags) {
MOZ_ASSERT(NS_IsMainThread());
if (mState == Finished) {
return;
}
MOZ_DIAGNOSTIC_ASSERT(mState == WaitingForScriptOrComparisonResult);
if (NS_WARN_IF(NS_FAILED(aStatus))) {
Fail(aStatus);
return;
}
mAreScriptsEqual = mAreScriptsEqual && aIsEqual;
if (aIsMainScript) {
mMaxScope = aMaxScope;
mLoadFlags = aLoadFlags;
}
// Check whether all CompareNetworks finished their jobs.
MOZ_DIAGNOSTIC_ASSERT(mPendingCount > 0);
if (--mPendingCount) {
return;
}
if (mAreScriptsEqual) {
MOZ_ASSERT(mCallback);
mCallback->ComparisonResult(aStatus, true /* aSameScripts */, mOnFailure,
u""_ns, mMaxScope, mLoadFlags);
Cleanup();
return;
}
// Write to Cache so ScriptLoader reads succeed.
WriteNetworkBufferToNewCache();
}
private:
~CompareManager() {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(mCNList.Length() == 0);
}
void Fail(nsresult aStatus);
void Cleanup();
nsresult FetchScript(const nsACString& aURL, bool aIsMainScript,
Cache* const aCache = nullptr) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_DIAGNOSTIC_ASSERT(mState == WaitingForInitialization ||
mState == WaitingForScriptOrComparisonResult);
RefPtr<CompareNetwork> cn =
new CompareNetwork(this, mRegistration, aIsMainScript);
mCNList.AppendElement(cn);
mPendingCount += 1;
nsresult rv = cn->Initialize(mPrincipal, aURL, aCache);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
return NS_OK;
}
void ManageOldCache(JSContext* aCx, JS::Handle<JS::Value> aValue) {
MOZ_DIAGNOSTIC_ASSERT(mState == WaitingForExistingOpen);
// RAII Cleanup when fails.
nsresult rv = NS_ERROR_FAILURE;
auto guard = MakeScopeExit([&] { Fail(rv); });
if (NS_WARN_IF(!aValue.isObject())) {
return;
}
MOZ_ASSERT(!mOldCache);
JS::Rooted<JSObject*> obj(aCx, &aValue.toObject());
if (NS_WARN_IF(!obj) ||
NS_WARN_IF(NS_FAILED(UNWRAP_OBJECT(Cache, obj, mOldCache)))) {
return;
}
Optional<RequestOrUTF8String> request;
CacheQueryOptions options;
ErrorResult error;
RefPtr<Promise> promise = mOldCache->Keys(aCx, request, options, error);
if (NS_WARN_IF(error.Failed())) {
// No exception here because there are no ReadableStreams involved here.
MOZ_ASSERT(!error.IsJSException());
rv = error.StealNSResult();
return;
}
mState = WaitingForExistingKeys;
promise->AppendNativeHandler(this);
guard.release();
}
void ManageOldKeys(JSContext* aCx, JS::Handle<JS::Value> aValue) {
MOZ_DIAGNOSTIC_ASSERT(mState == WaitingForExistingKeys);
// RAII Cleanup when fails.
nsresult rv = NS_ERROR_FAILURE;
auto guard = MakeScopeExit([&] { Fail(rv); });
if (NS_WARN_IF(!aValue.isObject())) {
return;
}
JS::Rooted<JSObject*> obj(aCx, &aValue.toObject());
if (NS_WARN_IF(!obj)) {
return;
}
uint32_t len = 0;
if (!JS::GetArrayLength(aCx, obj, &len)) {
return;
}
// Fetch and compare the source scripts.
MOZ_ASSERT(mPendingCount == 0);
mState = WaitingForScriptOrComparisonResult;
bool hasMainScript = false;
AutoTArray<nsCString, 8> urlList;
// Extract the list of URLs in the old cache.
for (uint32_t i = 0; i < len; ++i) {
JS::Rooted<JS::Value> val(aCx);
if (NS_WARN_IF(!JS_GetElement(aCx, obj, i, &val)) ||
NS_WARN_IF(!val.isObject())) {
return;
}
Request* request;
JS::Rooted<JSObject*> requestObj(aCx, &val.toObject());
if (NS_WARN_IF(NS_FAILED(UNWRAP_OBJECT(Request, &requestObj, request)))) {
return;
};
nsCString url;
request->GetUrl(url);
if (!hasMainScript && url == mURL) {
hasMainScript = true;
}
urlList.AppendElement(std::move(url));
}
// If the main script is missing, then something has gone wrong. We
// will try to continue with the update process to trigger a new
// installation. If that fails, however, then uninstall the registration
// because it is broken in a way that cannot be fixed.
if (!hasMainScript) {
mOnFailure = OnFailure::Uninstall;
}
// Always make sure to fetch the main script. If the old cache has
// no entries or the main script entry is missing, then the loop below
// may not trigger it. This should not really happen, but we handle it
// gracefully if it does occur. Its possible the bad cache state is due
// to a crash or shutdown during an update, etc.
rv = FetchScript(mURL, true /* aIsMainScript */, mOldCache);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
for (const auto& url : urlList) {
// We explicitly start the fetch for the main script above.
if (mURL == url) {
continue;
}
rv = FetchScript(url, false /* aIsMainScript */, mOldCache);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
}
guard.release();
}
void ManageNewCache(JSContext* aCx, JS::Handle<JS::Value> aValue) {
MOZ_DIAGNOSTIC_ASSERT(mState == WaitingForOpen);
// RAII Cleanup when fails.
nsresult rv = NS_ERROR_FAILURE;
auto guard = MakeScopeExit([&] { Fail(rv); });
if (NS_WARN_IF(!aValue.isObject())) {
return;
}
JS::Rooted<JSObject*> obj(aCx, &aValue.toObject());
if (NS_WARN_IF(!obj)) {
return;
}
Cache* cache = nullptr;
rv = UNWRAP_OBJECT(Cache, &obj, cache);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
// Just to be safe.
RefPtr<Cache> kungfuDeathGrip = cache;
MOZ_ASSERT(mPendingCount == 0);
for (uint32_t i = 0; i < mCNList.Length(); ++i) {
// We bail out immediately when something goes wrong.
rv = WriteToCache(aCx, cache, mCNList[i]);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
}
mState = WaitingForPut;
guard.release();
}
void WriteNetworkBufferToNewCache() {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(mCNList.Length() != 0);
MOZ_ASSERT(mCacheStorage);
MOZ_ASSERT(mNewCacheName.IsEmpty());
ErrorResult result;
result = serviceWorkerScriptCache::GenerateCacheName(mNewCacheName);
if (NS_WARN_IF(result.Failed())) {
MOZ_ASSERT(!result.IsErrorWithMessage());
Fail(result.StealNSResult());
return;
}
RefPtr<Promise> cacheOpenPromise =
mCacheStorage->Open(mNewCacheName, result);
if (NS_WARN_IF(result.Failed())) {
MOZ_ASSERT(!result.IsErrorWithMessage());
Fail(result.StealNSResult());
return;
}
mState = WaitingForOpen;
cacheOpenPromise->AppendNativeHandler(this);
}
nsresult WriteToCache(JSContext* aCx, Cache* aCache, CompareNetwork* aCN) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aCache);
MOZ_ASSERT(aCN);
MOZ_DIAGNOSTIC_ASSERT(mState == WaitingForOpen);
// We don't have to save any information from a failed CompareNetwork.
if (!aCN->Succeeded()) {
return NS_OK;
}
nsCOMPtr<nsIInputStream> body;
nsresult rv = NS_NewCStringInputStream(
getter_AddRefs(body), NS_ConvertUTF16toUTF8(aCN->Buffer()));
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
SafeRefPtr<InternalResponse> ir =
MakeSafeRefPtr<InternalResponse>(200, "OK"_ns);
ir->SetBody(body, aCN->Buffer().Length());
ir->SetURLList(aCN->URLList());
ir->InitChannelInfo(aCN->GetChannelInfo());
UniquePtr<PrincipalInfo> principalInfo = aCN->TakePrincipalInfo();
if (principalInfo) {
ir->SetPrincipalInfo(std::move(principalInfo));
}
RefPtr<InternalHeaders> internalHeaders = aCN->GetInternalHeaders();
ir->Headers()->Fill(*(internalHeaders.get()), IgnoreErrors());
RefPtr<Response> response =
new Response(aCache->GetGlobalObject(), std::move(ir), nullptr);
RequestOrUTF8String request;
request.SetAsUTF8String().ShareOrDependUpon(aCN->URL());
// For now we have to wait until the Put Promise is fulfilled before we can
// continue since Cache does not yet support starting a read that is being
// written to.
ErrorResult result;
RefPtr<Promise> cachePromise = aCache->Put(aCx, request, *response, result);
result.WouldReportJSException();
if (NS_WARN_IF(result.Failed())) {
// No exception here because there are no ReadableStreams involved here.
MOZ_ASSERT(!result.IsJSException());
MOZ_ASSERT(!result.IsErrorWithMessage());
return result.StealNSResult();
}
mPendingCount += 1;
cachePromise->AppendNativeHandler(this);
return NS_OK;
}
RefPtr<ServiceWorkerRegistrationInfo> mRegistration;
RefPtr<CompareCallback> mCallback;
RefPtr<CacheStorage> mCacheStorage;
nsTArray<RefPtr<CompareNetwork>> mCNList;
nsCString mURL;
RefPtr<nsIPrincipal> mPrincipal;
// Used for the old cache where saves the old source scripts.
RefPtr<Cache> mOldCache;
// Only used if the network script has changed and needs to be cached.
nsString mNewCacheName;
nsCString mMaxScope;
nsLoadFlags mLoadFlags;
enum {
WaitingForInitialization,
WaitingForExistingOpen,
WaitingForExistingKeys,
WaitingForScriptOrComparisonResult,
WaitingForOpen,
WaitingForPut,
Finished
} mState;
uint32_t mPendingCount;
OnFailure mOnFailure;
bool mAreScriptsEqual;
};
NS_IMPL_ISUPPORTS0(CompareManager)
nsresult CompareNetwork::Initialize(nsIPrincipal* aPrincipal,
const nsACString& aURL,
Cache* const aCache) {
MOZ_ASSERT(aPrincipal);
MOZ_ASSERT(NS_IsMainThread());
nsCOMPtr<nsIURI> uri;
nsresult rv = NS_NewURI(getter_AddRefs(uri), aURL);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
mURL = aURL;
mURLList.AppendElement(mURL);
nsCOMPtr<nsILoadGroup> loadGroup;
rv = NS_NewLoadGroup(getter_AddRefs(loadGroup), aPrincipal);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
// Update LoadFlags for propagating to ServiceWorkerInfo.
mLoadFlags = nsIChannel::LOAD_BYPASS_SERVICE_WORKER;
ServiceWorkerUpdateViaCache uvc = mRegistration->GetUpdateViaCache();
if (uvc == ServiceWorkerUpdateViaCache::None ||
(uvc == ServiceWorkerUpdateViaCache::Imports && mIsMainScript)) {
mLoadFlags |= nsIRequest::VALIDATE_ALWAYS;
}
if (mRegistration->IsLastUpdateCheckTimeOverOneDay()) {
mLoadFlags |= nsIRequest::LOAD_BYPASS_CACHE;
}
// Different settings are needed for fetching imported scripts, since they
// might be cross-origin scripts.
uint32_t secFlags =
mIsMainScript ? nsILoadInfo::SEC_REQUIRE_SAME_ORIGIN_DATA_IS_BLOCKED
: nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_INHERITS_SEC_CONTEXT;
nsContentPolicyType contentPolicyType =
mIsMainScript ? nsIContentPolicy::TYPE_INTERNAL_SERVICE_WORKER
: nsIContentPolicy::TYPE_INTERNAL_WORKER_IMPORT_SCRIPTS;
// Create a new cookieJarSettings.
nsCOMPtr<nsICookieJarSettings> cookieJarSettings =
mozilla::net::CookieJarSettings::Create(aPrincipal);
// Populate the partitionKey by using the given prinicpal. The ServiceWorkers
// are using the foreign partitioned principal, so we can get the partitionKey
// from it and the partitionKey will only exist if it's in the third-party
// context. In first-party context, we can still use the uri to set the
// partitionKey.
if (!aPrincipal->OriginAttributesRef().mPartitionKey.IsEmpty()) {
net::CookieJarSettings::Cast(cookieJarSettings)
->SetPartitionKey(aPrincipal->OriginAttributesRef().mPartitionKey);
} else {
net::CookieJarSettings::Cast(cookieJarSettings)
->SetPartitionKey(uri, false);
}
// Note that because there is no "serviceworker" RequestContext type, we can
// use the TYPE_INTERNAL_SCRIPT content policy types when loading a service
// worker.
rv = NS_NewChannel(getter_AddRefs(mChannel), uri, aPrincipal, secFlags,
contentPolicyType, cookieJarSettings,
nullptr /* aPerformanceStorage */, loadGroup,
nullptr /* aCallbacks */, mLoadFlags);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
// Set the IsInThirdPartyContext for the channel's loadInfo according to the
// partitionKey of the principal. The worker is foreign if it's using
// partitioned principal, i.e. the partitionKey is not empty. In this case,
// we need to set the bit to the channel's loadInfo.
if (!aPrincipal->OriginAttributesRef().mPartitionKey.IsEmpty()) {
nsCOMPtr<nsILoadInfo> loadInfo = mChannel->LoadInfo();
rv = loadInfo->SetIsInThirdPartyContext(true);
MOZ_ASSERT(NS_SUCCEEDED(rv));
}
nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(mChannel);
if (httpChannel) {
// Spec says no redirects allowed for top-level SW scripts.
if (mIsMainScript) {
rv = httpChannel->SetRedirectionLimit(0);
MOZ_ASSERT(NS_SUCCEEDED(rv));
}
rv = httpChannel->SetRequestHeader("Service-Worker"_ns, "script"_ns,
/* merge */ false);
MOZ_ASSERT(NS_SUCCEEDED(rv));
}
nsCOMPtr<nsIStreamLoader> loader;
rv = NS_NewStreamLoader(getter_AddRefs(loader), this, this);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
rv = mChannel->AsyncOpen(loader);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
// If we do have an existing cache to compare with.
if (aCache) {
mCC = new CompareCache(this);
rv = mCC->Initialize(aCache, aURL);
if (NS_WARN_IF(NS_FAILED(rv))) {
Abort();
return rv;
}
mState = WaitingForBothFinished;
return NS_OK;
}
mState = WaitingForNetworkFinished;
return NS_OK;
}
void CompareNetwork::Finish() {
if (mState == Finished) {
return;
}
bool same = true;
nsresult rv = NS_OK;
// mNetworkResult is prior to mCacheResult, since it's needed for reporting
// various errors to web content.
if (NS_FAILED(mNetworkResult)) {
// An imported script could become offline, since it might no longer be
// needed by the new importing script. In that case, the importing script
// must be different, and thus, it's okay to report same script found here.
rv = mIsMainScript ? mNetworkResult : NS_OK;
same = true;
} else if (mCC && NS_FAILED(mCacheResult)) {
rv = mCacheResult;
} else { // Both passed.
same = mCC && mCC->InCache() && mCC->Buffer().Equals(mBuffer);
}
mManager->ComparisonFinished(rv, mIsMainScript, same, mMaxScope, mLoadFlags);
// We have done with the CompareCache.
mCC = nullptr;
}
void CompareNetwork::NetworkFinish(nsresult aRv) {
MOZ_DIAGNOSTIC_ASSERT(mState == WaitingForBothFinished ||
mState == WaitingForNetworkFinished);
mNetworkResult = aRv;
if (mState == WaitingForBothFinished) {
mState = WaitingForCacheFinished;
return;
}
if (mState == WaitingForNetworkFinished) {
Finish();
return;
}
}
void CompareNetwork::CacheFinish(nsresult aRv) {
MOZ_DIAGNOSTIC_ASSERT(mState == WaitingForBothFinished ||
mState == WaitingForCacheFinished);
mCacheResult = aRv;
if (mState == WaitingForBothFinished) {
mState = WaitingForNetworkFinished;
return;
}
if (mState == WaitingForCacheFinished) {
Finish();
return;
}
}
void CompareNetwork::Abort() {
MOZ_ASSERT(NS_IsMainThread());
if (mState != Finished) {
mState = Finished;
MOZ_ASSERT(mChannel);
mChannel->CancelWithReason(NS_BINDING_ABORTED, "CompareNetwork::Abort"_ns);
mChannel = nullptr;
if (mCC) {
mCC->Abort();
mCC = nullptr;
}
}
}
NS_IMETHODIMP
CompareNetwork::OnStartRequest(nsIRequest* aRequest) {
MOZ_ASSERT(NS_IsMainThread());
if (mState == Finished) {
return NS_OK;
}
nsCOMPtr<nsIChannel> channel = do_QueryInterface(aRequest);
MOZ_ASSERT_IF(mIsMainScript, channel == mChannel);
mChannel = channel;
MOZ_ASSERT(!mChannelInfo.IsInitialized());
mChannelInfo.InitFromChannel(mChannel);
nsresult rv = SetPrincipalInfo(mChannel);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
mInternalHeaders->FillResponseHeaders(mChannel);
nsCOMPtr<nsICacheInfoChannel> cacheChannel(do_QueryInterface(channel));
if (cacheChannel) {
cacheChannel->IsFromCache(&mIsFromCache);
}
return NS_OK;
}
nsresult CompareNetwork::SetPrincipalInfo(nsIChannel* aChannel) {
nsIScriptSecurityManager* ssm = nsContentUtils::GetSecurityManager();
if (!ssm) {
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsIPrincipal> channelPrincipal;
nsresult rv = ssm->GetChannelResultPrincipal(
aChannel, getter_AddRefs(channelPrincipal));
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
UniquePtr<PrincipalInfo> principalInfo = MakeUnique<PrincipalInfo>();
rv = PrincipalToPrincipalInfo(channelPrincipal, principalInfo.get());
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
mPrincipalInfo = std::move(principalInfo);
return NS_OK;
}
NS_IMETHODIMP
CompareNetwork::OnStopRequest(nsIRequest* aRequest, nsresult aStatusCode) {
// Nothing to do here!
return NS_OK;
}
NS_IMETHODIMP
CompareNetwork::OnStreamComplete(nsIStreamLoader* aLoader,
nsISupports* aContext, nsresult aStatus,
uint32_t aLen, const uint8_t* aString) {
MOZ_ASSERT(NS_IsMainThread());
if (mState == Finished) {
return NS_OK;
}
nsresult rv = NS_ERROR_FAILURE;
auto guard = MakeScopeExit([&] { NetworkFinish(rv); });
if (NS_WARN_IF(NS_FAILED(aStatus))) {
rv = (aStatus == NS_ERROR_REDIRECT_LOOP) ? NS_ERROR_DOM_SECURITY_ERR
: aStatus;
return NS_OK;
}
nsCOMPtr<nsIRequest> request;
rv = aLoader->GetRequest(getter_AddRefs(request));
if (NS_WARN_IF(NS_FAILED(rv))) {
return NS_OK;
}
nsCOMPtr<nsIChannel> channel = do_QueryInterface(request);
MOZ_ASSERT(channel, "How come we don't have any channel?");
nsCOMPtr<nsIURI> uri;
channel->GetOriginalURI(getter_AddRefs(uri));
bool isExtension = uri->SchemeIs("moz-extension");
if (isExtension &&
!StaticPrefs::extensions_backgroundServiceWorker_enabled_AtStartup()) {
// Return earlier with error is the worker script is a moz-extension url
// but the feature isn't enabled by prefs.
return NS_ERROR_FAILURE;
}
if (isExtension) {
// NOTE: trying to register any moz-extension use that doesn't ends
// with .js/.jsm/.mjs seems to be already completing with an error
// in aStatus and they never reach this point.
// TODO: look into avoid duplicated parts that could be shared with the HTTP
// channel scenario.
nsCOMPtr<nsIURI> channelURL;
rv = channel->GetURI(getter_AddRefs(channelURL));
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
nsCString channelURLSpec;
MOZ_ALWAYS_SUCCEEDS(channelURL->GetSpec(channelURLSpec));
// Append the final URL (which for an extension worker script is going to
// be a file or jar url).
MOZ_DIAGNOSTIC_ASSERT(!mURLList.IsEmpty());
if (channelURLSpec != mURLList[0]) {
mURLList.AppendElement(channelURLSpec);
}
UniquePtr<char16_t[], JS::FreePolicy> buffer;
size_t len = 0;
rv = ScriptLoader::ConvertToUTF16(channel, aString, aLen, u"UTF-8"_ns,
nullptr, buffer, len);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
mBuffer.Adopt(buffer.release(), len);
rv = NS_OK;
return NS_OK;
}
nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(request);
// Main scripts cannot be redirected successfully, however extensions
// may successfuly redirect imported scripts to a moz-extension url
// (if listed in the web_accessible_resources manifest property).
//
// When the service worker is initially registered the imported scripts
// will be loaded from the child process (see dom/workers/ScriptLoader.cpp)
// and in that case this method will only be called for the main script.
//
// When a registered worker is loaded again (e.g. when the webpage calls
// the ServiceWorkerRegistration's update method):
//
// - both the main and imported scripts are loaded by the
// CompareManager::FetchScript
// - the update requests for the imported scripts will also be calling this
// method and we should expect scripts redirected to an extension script
// to have a null httpChannel.
//
// The request that triggers this method is:
//
// - the one that is coming from the network (which may be intercepted by
// WebRequest listeners in extensions and redirected to a web_accessible
// moz-extension url)
// - it will then be compared with a previous response that we may have
// in the cache
//
// When the next service worker update occurs, if the request (for an imported
// script) is not redirected by an extension the cache entry is invalidated
// and a network request is triggered for the import.
if (!httpChannel) {
// Redirecting a service worker main script should fail before reaching this
// method.
// If a main script is somehow redirected, the diagnostic assert will crash
// in non-release builds. Release builds will return an explicit error.
MOZ_DIAGNOSTIC_ASSERT(!mIsMainScript,
"Unexpected ServiceWorker main script redirected");
if (mIsMainScript) {
return NS_ERROR_UNEXPECTED;
}
nsCOMPtr<nsIPrincipal> channelPrincipal;
nsIScriptSecurityManager* ssm = nsContentUtils::GetSecurityManager();
if (!ssm) {
return NS_ERROR_UNEXPECTED;
}
nsresult rv = ssm->GetChannelResultPrincipal(
channel, getter_AddRefs(channelPrincipal));
// An extension did redirect a non-MainScript request to a moz-extension url
// (in that case the originalURL is the resolved jar URI and so we have to
// look to the channel principal instead).
if (channelPrincipal->SchemeIs("moz-extension")) {
UniquePtr<char16_t[], JS::FreePolicy> buffer;
size_t len = 0;
rv = ScriptLoader::ConvertToUTF16(channel, aString, aLen, u"UTF-8"_ns,
nullptr, buffer, len);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
mBuffer.Adopt(buffer.release(), len);
return NS_OK;
}
// Make non-release and debug builds to crash if this happens and fail
// explicitly on release builds.
MOZ_DIAGNOSTIC_CRASH(
"ServiceWorker imported script redirected to an url "
"with an unexpected scheme");
return NS_ERROR_UNEXPECTED;
}
bool requestSucceeded;
rv = httpChannel->GetRequestSucceeded(&requestSucceeded);
if (NS_WARN_IF(NS_FAILED(rv))) {
return NS_OK;
}
if (NS_WARN_IF(!requestSucceeded)) {
// Get the stringified numeric status code, not statusText which could be
// something misleading like OK for a 404.
uint32_t status = 0;
Unused << httpChannel->GetResponseStatus(
&status); // don't care if this fails, use 0.
nsAutoString statusAsText;
statusAsText.AppendInt(status);
ServiceWorkerManager::LocalizeAndReportToAllClients(
mRegistration->Scope(), "ServiceWorkerRegisterNetworkError",
nsTArray<nsString>{NS_ConvertUTF8toUTF16(mRegistration->Scope()),
statusAsText, NS_ConvertUTF8toUTF16(mURL)});
rv = NS_ERROR_FAILURE;
return NS_OK;
}
// Note: we explicitly don't check for the return value here, because the
// absence of the header is not an error condition.
Unused << httpChannel->GetResponseHeader("Service-Worker-Allowed"_ns,
mMaxScope);
// [9.2 Update]4.13, If response's cache state is not "local",
// set registration's last update check time to the current time
if (!mIsFromCache) {
mRegistration->RefreshLastUpdateCheckTime();
}
nsAutoCString mimeType;
rv = httpChannel->GetContentType(mimeType);
if (NS_WARN_IF(NS_FAILED(rv))) {
// We should only end up here if !mResponseHead in the channel. If headers
// were received but no content type was specified, we'll be given
// UNKNOWN_CONTENT_TYPE "application/x-unknown-content-type" and so fall
// into the next case with its better error message.
rv = NS_ERROR_DOM_SECURITY_ERR;
return rv;
}
if (mimeType.IsEmpty() ||
!nsContentUtils::IsJavascriptMIMEType(NS_ConvertUTF8toUTF16(mimeType))) {
ServiceWorkerManager::LocalizeAndReportToAllClients(
mRegistration->Scope(), "ServiceWorkerRegisterMimeTypeError2",
nsTArray<nsString>{NS_ConvertUTF8toUTF16(mRegistration->Scope()),
NS_ConvertUTF8toUTF16(mimeType),
NS_ConvertUTF8toUTF16(mURL)});
rv = NS_ERROR_DOM_SECURITY_ERR;
return rv;
}
nsCOMPtr<nsIURI> channelURL;
rv = httpChannel->GetURI(getter_AddRefs(channelURL));
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
nsCString channelURLSpec;
MOZ_ALWAYS_SUCCEEDS(channelURL->GetSpec(channelURLSpec));
// Append the final URL if its different from the original
// request URL. This lets us note that a redirect occurred
// even though we don't track every redirect URL here.
MOZ_DIAGNOSTIC_ASSERT(!mURLList.IsEmpty());
if (channelURLSpec != mURLList[0]) {
mURLList.AppendElement(channelURLSpec);
}
UniquePtr<char16_t[], JS::FreePolicy> buffer;
size_t len = 0;
rv = ScriptLoader::ConvertToUTF16(httpChannel, aString, aLen, u"UTF-8"_ns,
nullptr, buffer, len);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
mBuffer.Adopt(buffer.release(), len);
rv = NS_OK;
return NS_OK;
}
nsresult CompareCache::Initialize(Cache* const aCache, const nsACString& aURL) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aCache);
MOZ_DIAGNOSTIC_ASSERT(mState == WaitingForInitialization);
// This JSContext will not end up executing JS code because here there are
// no ReadableStreams involved.
AutoJSAPI jsapi;
jsapi.Init();
RequestOrUTF8String request;
request.SetAsUTF8String().ShareOrDependUpon(aURL);
ErrorResult error;
CacheQueryOptions params;
RefPtr<Promise> promise = aCache->Match(jsapi.cx(), request, params, error);
if (NS_WARN_IF(error.Failed())) {
// No exception here because there are no ReadableStreams involved here.
MOZ_ASSERT(!error.IsJSException());
mState = Finished;
return error.StealNSResult();
}
// Retrieve the script from aCache.
mState = WaitingForScript;
promise->AppendNativeHandler(this);
return NS_OK;
}
void CompareCache::Finish(nsresult aStatus, bool aInCache) {
if (mState != Finished) {
mState = Finished;
mInCache = aInCache;
mCN->CacheFinish(aStatus);
}
}
void CompareCache::Abort() {
MOZ_ASSERT(NS_IsMainThread());
if (mState != Finished) {
mState = Finished;
if (mPump) {
mPump->CancelWithReason(NS_BINDING_ABORTED, "CompareCache::Abort"_ns);
mPump = nullptr;
}
}
}
NS_IMETHODIMP
CompareCache::OnStreamComplete(nsIStreamLoader* aLoader, nsISupports* aContext,
nsresult aStatus, uint32_t aLen,
const uint8_t* aString) {
MOZ_ASSERT(NS_IsMainThread());
if (mState == Finished) {
return aStatus;
}
if (NS_WARN_IF(NS_FAILED(aStatus))) {
Finish(aStatus, false);
return aStatus;
}
UniquePtr<char16_t[], JS::FreePolicy> buffer;
size_t len = 0;
nsresult rv = ScriptLoader::ConvertToUTF16(nullptr, aString, aLen,
u"UTF-8"_ns, nullptr, buffer, len);
if (NS_WARN_IF(NS_FAILED(rv))) {
Finish(rv, false);
return rv;
}
mBuffer.Adopt(buffer.release(), len);
Finish(NS_OK, true);
return NS_OK;
}
void CompareCache::ResolvedCallback(JSContext* aCx,
JS::Handle<JS::Value> aValue,
ErrorResult& aRv) {
MOZ_ASSERT(NS_IsMainThread());
switch (mState) {
case Finished:
return;
case WaitingForScript:
ManageValueResult(aCx, aValue);
return;
default:
MOZ_CRASH("Unacceptable state.");
}
}
void CompareCache::RejectedCallback(JSContext* aCx,
JS::Handle<JS::Value> aValue,
ErrorResult& aRv) {
MOZ_ASSERT(NS_IsMainThread());
if (mState != Finished) {
Finish(NS_ERROR_FAILURE, false);
return;
}
}
void CompareCache::ManageValueResult(JSContext* aCx,
JS::Handle<JS::Value> aValue) {
MOZ_ASSERT(NS_IsMainThread());
// The cache returns undefined if the object is not stored.
if (aValue.isUndefined()) {
Finish(NS_OK, false);
return;
}
MOZ_ASSERT(aValue.isObject());
JS::Rooted<JSObject*> obj(aCx, &aValue.toObject());
if (NS_WARN_IF(!obj)) {
Finish(NS_ERROR_FAILURE, false);
return;
}
Response* response = nullptr;
nsresult rv = UNWRAP_OBJECT(Response, &obj, response);
if (NS_WARN_IF(NS_FAILED(rv))) {
Finish(rv, false);
return;
}
MOZ_ASSERT(response->Ok());
nsCOMPtr<nsIInputStream> inputStream;
response->GetBody(getter_AddRefs(inputStream));
MOZ_ASSERT(inputStream);
MOZ_ASSERT(!mPump);
rv = NS_NewInputStreamPump(getter_AddRefs(mPump), inputStream.forget(),
0, /* default segsize */
0, /* default segcount */
false, /* default closeWhenDone */
GetMainThreadSerialEventTarget());
if (NS_WARN_IF(NS_FAILED(rv))) {
Finish(rv, false);
return;
}
nsCOMPtr<nsIStreamLoader> loader;
rv = NS_NewStreamLoader(getter_AddRefs(loader), this);
if (NS_WARN_IF(NS_FAILED(rv))) {
Finish(rv, false);
return;
}
rv = mPump->AsyncRead(loader);
if (NS_WARN_IF(NS_FAILED(rv))) {
mPump = nullptr;
Finish(rv, false);
return;
}
nsCOMPtr<nsIThreadRetargetableRequest> rr = do_QueryInterface(mPump);
if (rr) {
nsCOMPtr<nsIEventTarget> sts =
do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID);
RefPtr<TaskQueue> queue =
TaskQueue::Create(sts.forget(), "CompareCache STS Delivery Queue");
rv = rr->RetargetDeliveryTo(queue);
if (NS_WARN_IF(NS_FAILED(rv))) {
mPump = nullptr;
Finish(rv, false);
return;
}
}
}
nsresult CompareManager::Initialize(nsIPrincipal* aPrincipal,
const nsACString& aURL,
const nsAString& aCacheName) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aPrincipal);
MOZ_ASSERT(mPendingCount == 0);
MOZ_DIAGNOSTIC_ASSERT(mState == WaitingForInitialization);
// RAII Cleanup when fails.
auto guard = MakeScopeExit([&] { Cleanup(); });
mURL = aURL;
mPrincipal = aPrincipal;
// Always create a CacheStorage since we want to write the network entry to
// the cache even if there isn't an existing one.
AutoJSAPI jsapi;
jsapi.Init();
ErrorResult result;
mCacheStorage = CreateCacheStorage(jsapi.cx(), aPrincipal, result);
if (NS_WARN_IF(result.Failed())) {
MOZ_ASSERT(!result.IsErrorWithMessage());
return result.StealNSResult();
}
// If there is no existing cache, proceed to fetch the script directly.
if (aCacheName.IsEmpty()) {
mState = WaitingForScriptOrComparisonResult;
nsresult rv = FetchScript(aURL, true /* aIsMainScript */);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
guard.release();
return NS_OK;
}
// Open the cache saving the old source scripts.
RefPtr<Promise> promise = mCacheStorage->Open(aCacheName, result);
if (NS_WARN_IF(result.Failed())) {
MOZ_ASSERT(!result.IsErrorWithMessage());
return result.StealNSResult();
}
mState = WaitingForExistingOpen;
promise->AppendNativeHandler(this);
guard.release();
return NS_OK;
}
// This class manages 4 promises if needed:
// 1. Retrieve the Cache object by a given CacheName of OldCache.
// 2. Retrieve the URLs saved in OldCache.
// 3. Retrieve the Cache object of the NewCache for the newly created SW.
// 4. Put the value in the cache.
// For this reason we have mState to know what callback we are handling.
void CompareManager::ResolvedCallback(JSContext* aCx,
JS::Handle<JS::Value> aValue,
ErrorResult& aRv) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(mCallback);
switch (mState) {
case Finished:
return;
case WaitingForExistingOpen:
ManageOldCache(aCx, aValue);
return;
case WaitingForExistingKeys:
ManageOldKeys(aCx, aValue);
return;
case WaitingForOpen:
ManageNewCache(aCx, aValue);
return;
case WaitingForPut:
MOZ_DIAGNOSTIC_ASSERT(mPendingCount > 0);
if (--mPendingCount == 0) {
mCallback->ComparisonResult(NS_OK, false /* aIsEqual */, mOnFailure,
mNewCacheName, mMaxScope, mLoadFlags);
Cleanup();
}
return;
default:
MOZ_DIAGNOSTIC_CRASH("Missing case in CompareManager::ResolvedCallback");
}
}
void CompareManager::RejectedCallback(JSContext* aCx,
JS::Handle<JS::Value> aValue,
ErrorResult& aRv) {
MOZ_ASSERT(NS_IsMainThread());
switch (mState) {
case Finished:
return;
case WaitingForExistingOpen:
NS_WARNING("Could not open the existing cache.");
break;
case WaitingForExistingKeys:
NS_WARNING("Could not get the existing URLs.");
break;
case WaitingForOpen:
NS_WARNING("Could not open cache.");
break;
case WaitingForPut:
NS_WARNING("Could not write to cache.");
break;
default:
MOZ_DIAGNOSTIC_CRASH("Missing case in CompareManager::RejectedCallback");
}
Fail(NS_ERROR_FAILURE);
}
void CompareManager::Fail(nsresult aStatus) {
MOZ_ASSERT(NS_IsMainThread());
mCallback->ComparisonResult(aStatus, false /* aIsEqual */, mOnFailure, u""_ns,
""_ns, mLoadFlags);
Cleanup();
}
void CompareManager::Cleanup() {
MOZ_ASSERT(NS_IsMainThread());
if (mState != Finished) {
mState = Finished;
MOZ_ASSERT(mCallback);
mCallback = nullptr;
// Abort and release CompareNetworks.
for (uint32_t i = 0; i < mCNList.Length(); ++i) {
mCNList[i]->Abort();
}
mCNList.Clear();
}
}
} // namespace
nsresult PurgeCache(nsIPrincipal* aPrincipal, const nsAString& aCacheName) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aPrincipal);
if (aCacheName.IsEmpty()) {
return NS_OK;
}
AutoJSAPI jsapi;
jsapi.Init();
ErrorResult rv;
RefPtr<CacheStorage> cacheStorage =
CreateCacheStorage(jsapi.cx(), aPrincipal, rv);
if (NS_WARN_IF(rv.Failed())) {
return rv.StealNSResult();
}
// We use the ServiceWorker scope as key for the cacheStorage.
RefPtr<Promise> promise = cacheStorage->Delete(aCacheName, rv);
if (NS_WARN_IF(rv.Failed())) {
return rv.StealNSResult();
}
// Set [[PromiseIsHandled]] to ensure that if this promise gets rejected,
// we don't end up reporting a rejected promise to the console.
MOZ_ALWAYS_TRUE(promise->SetAnyPromiseIsHandled());
// We don't actually care about the result of the delete operation.
return NS_OK;
}
nsresult GenerateCacheName(nsAString& aName) {
nsresult rv;
nsCOMPtr<nsIUUIDGenerator> uuidGenerator =
do_GetService("@mozilla.org/uuid-generator;1", &rv);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
nsID id;
rv = uuidGenerator->GenerateUUIDInPlace(&id);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
char chars[NSID_LENGTH];
id.ToProvidedString(chars);
// NSID_LENGTH counts the null terminator.
aName.AssignASCII(chars, NSID_LENGTH - 1);
return NS_OK;
}
nsresult Compare(ServiceWorkerRegistrationInfo* aRegistration,
nsIPrincipal* aPrincipal, const nsAString& aCacheName,
const nsACString& aURL, CompareCallback* aCallback) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aRegistration);
MOZ_ASSERT(aPrincipal);
MOZ_ASSERT(!aURL.IsEmpty());
MOZ_ASSERT(aCallback);
RefPtr<CompareManager> cm = new CompareManager(aRegistration, aCallback);
nsresult rv = cm->Initialize(aPrincipal, aURL, aCacheName);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
return NS_OK;
}
} // namespace mozilla::dom::serviceWorkerScriptCache