SSL nsContentUtils.cpp Sprache: C

/* -*- 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/. */

/* A namespace class for static layout utilities. */

#include "nsContentUtils.h"

#include <algorithm>
#include <cstddef>
#include <cstdint>
#include <cstdlib>
#include <cstring>
#include <functional>
#include <new>
#include <utility>
#include "BrowserChild.h"
#include "DecoderTraits.h"
#include "ErrorList.h"
#include "HTMLSplitOnSpacesTokenizer.h"
#include "ImageOps.h"
#include "InProcessBrowserChildMessageManager.h"
#include "MainThreadUtils.h"
#include "PLDHashTable.h"
#include "ReferrerInfo.h"
#include "ScopedNSSTypes.h"
#include "ThirdPartyUtil.h"
#include "Units.h"
#include "chrome/common/ipc_message.h"
#include "gfxDrawable.h"
#include "harfbuzz/hb.h"
#include "imgICache.h"
#include "imgIContainer.h"
#include "imgILoader.h"
#include "imgIRequest.h"
#include "imgLoader.h"
#include "js/Array.h"
#include "js/ArrayBuffer.h"
#include "js/BuildId.h"
#include "js/GCAPI.h"
#include "js/Id.h"
#include "js/JSON.h"
#include "js/PropertyAndElement.h"  // JS_DefineElement, JS_GetProperty
#include "js/PropertyDescriptor.h"
#include "js/Realm.h"
#include "js/RegExp.h"
#include "js/RegExpFlags.h"
#include "js/RootingAPI.h"
#include "js/TypeDecls.h"
#include "js/Value.h"
#include "js/Wrapper.h"
#include "jsapi.h"
#include "jsfriendapi.h"
#include "mozAutoDocUpdate.h"
#include "mozIDOMWindow.h"
#include "nsIOService.h"
#include "nsObjectLoadingContent.h"
#include "mozilla/AlreadyAddRefed.h"
#include "mozilla/ArrayIterator.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/AsyncEventDispatcher.h"
#include "mozilla/AtomArray.h"
#include "mozilla/Atomics.h"
#include "mozilla/Attributes.h"
#include "mozilla/AutoRestore.h"
#include "mozilla/BackgroundHangMonitor.h"
#include "mozilla/Base64.h"
#include "mozilla/BasePrincipal.h"
#include "mozilla/BasicEvents.h"
#include "mozilla/BloomFilter.h"
#include "mozilla/CORSMode.h"
#include "mozilla/CallState.h"
#include "mozilla/CheckedInt.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/Components.h"
#include "mozilla/ContentBlockingAllowList.h"
#include "mozilla/CycleCollectedJSContext.h"
#include "mozilla/DOMEventTargetHelper.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/ErrorResult.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventListenerManager.h"
#include "mozilla/EventQueue.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/FlushType.h"
#include "mozilla/FOGIPC.h"
#include "mozilla/HTMLEditor.h"
#include "mozilla/HangAnnotations.h"
#include "mozilla/IMEStateManager.h"
#include "mozilla/InputEventOptions.h"
#include "mozilla/InternalMutationEvent.h"
#include "mozilla/Latin1.h"
#include "mozilla/Likely.h"
#include "mozilla/LoadInfo.h"
#include "mozilla/Logging.h"
#include "mozilla/MacroForEach.h"
#include "mozilla/ManualNAC.h"
#include "mozilla/Maybe.h"
#include "mozilla/MediaFeatureChange.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/NotNull.h"
#include "mozilla/NullPrincipal.h"
#include "mozilla/OriginAttributes.h"
#include "mozilla/Preferences.h"
#include "mozilla/PresShell.h"
#include "mozilla/ProfilerRunnable.h"
#include "mozilla/RangeBoundary.h"
#include "mozilla/RefPtr.h"
#include "mozilla/Result.h"
#include "mozilla/ResultExtensions.h"
#include "mozilla/ScrollbarPreferences.h"
#include "mozilla/ScrollContainerFrame.h"
#include "mozilla/ShutdownPhase.h"
#include "mozilla/Span.h"
#include "mozilla/StaticAnalysisFunctions.h"
#include "mozilla/StaticPrefs_browser.h"
#include "mozilla/StaticPrefs_dom.h"
#ifdef FUZZING
#  include "mozilla/StaticPrefs_fuzzing.h"
#endif
#include "mozilla/StaticPrefs_nglayout.h"
#include "mozilla/StaticPrefs_privacy.h"
#include "mozilla/StaticPrefs_test.h"
#include "mozilla/StaticPrefs_ui.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/TextControlState.h"
#include "mozilla/TextEditor.h"
#include "mozilla/TextEvents.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/Unused.h"
#include "mozilla/Variant.h"
#include "mozilla/ViewportUtils.h"
#include "mozilla/dom/AncestorIterator.h"
#include "mozilla/dom/AutoEntryScript.h"
#include "mozilla/dom/AutocompleteInfoBinding.h"
#include "mozilla/dom/AutoSuppressEventHandlingAndSuspend.h"
#include "mozilla/dom/BindingDeclarations.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/BlobImpl.h"
#include "mozilla/dom/BlobURLProtocolHandler.h"
#include "mozilla/dom/BorrowedAttrInfo.h"
#include "mozilla/dom/BrowserBridgeParent.h"
#include "mozilla/dom/BrowserParent.h"
#include "mozilla/dom/BrowsingContext.h"
#include "mozilla/dom/BrowsingContextGroup.h"
#include "mozilla/dom/CacheExpirationTime.h"
#include "mozilla/dom/CallbackFunction.h"
#include "mozilla/dom/CallbackObject.h"
#include "mozilla/dom/ChromeMessageBroadcaster.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/dom/ContentFrameMessageManager.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/CustomElementRegistry.h"
#include "mozilla/dom/CustomElementRegistryBinding.h"
#include "mozilla/dom/CustomElementTypes.h"
#include "mozilla/dom/DOMArena.h"
#include "mozilla/dom/DOMException.h"
#include "mozilla/dom/DOMExceptionBinding.h"
#include "mozilla/dom/DOMSecurityMonitor.h"
#include "mozilla/dom/DOMTypes.h"
#include "mozilla/dom/DataTransfer.h"
#include "mozilla/dom/DocGroup.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/DocumentFragment.h"
#include "mozilla/dom/DocumentInlines.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/ElementBinding.h"
#include "mozilla/dom/ElementInlines.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/EventTarget.h"
#include "mozilla/dom/FileBlobImpl.h"
#include "mozilla/dom/FileSystemSecurity.h"
#include "mozilla/dom/FilteredNodeIterator.h"
#include "mozilla/dom/FormData.h"
#include "mozilla/dom/FragmentOrElement.h"
#include "mozilla/dom/FromParser.h"
#include "mozilla/dom/HTMLElement.h"
#include "mozilla/dom/HTMLFormElement.h"
#include "mozilla/dom/HTMLImageElement.h"
#include "mozilla/dom/HTMLInputElement.h"
#include "mozilla/dom/HTMLTemplateElement.h"
#include "mozilla/dom/HTMLTextAreaElement.h"
#include "mozilla/dom/IPCBlob.h"
#include "mozilla/dom/IPCBlobUtils.h"
#include "mozilla/dom/MessageBroadcaster.h"
#include "mozilla/dom/MessageListenerManager.h"
#include "mozilla/dom/MessagePort.h"
#include "mozilla/dom/MouseEventBinding.h"
#include "mozilla/dom/NameSpaceConstants.h"
#include "mozilla/dom/NodeBinding.h"
#include "mozilla/dom/NodeInfo.h"
#include "mozilla/dom/PBrowser.h"
#include "mozilla/dom/PContentChild.h"
#include "mozilla/dom/PrototypeList.h"
#include "mozilla/dom/ReferrerPolicyBinding.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/dom/Selection.h"
#include "mozilla/dom/ShadowRoot.h"
#include "mozilla/dom/Text.h"
#include "mozilla/dom/TrustedHTML.h"
#include "mozilla/dom/TrustedTypesConstants.h"
#include "mozilla/dom/TrustedTypeUtils.h"
#include "mozilla/dom/UserActivation.h"
#include "mozilla/dom/ViewTransition.h"
#include "mozilla/dom/WindowContext.h"
#include "mozilla/dom/WorkerCommon.h"
#include "mozilla/dom/WorkerPrivate.h"
#include "mozilla/dom/WorkerRunnable.h"
#include "mozilla/dom/XULCommandEvent.h"
#include "mozilla/glean/GleanPings.h"
#include "mozilla/fallible.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/BaseMargin.h"
#include "mozilla/gfx/BasePoint.h"
#include "mozilla/gfx/BaseSize.h"
#include "mozilla/gfx/DataSurfaceHelpers.h"
#include "mozilla/gfx/Point.h"
#include "mozilla/gfx/Rect.h"
#include "mozilla/gfx/Types.h"
#include "mozilla/ipc/ProtocolUtils.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/net/UrlClassifierCommon.h"
#include "mozilla/Tokenizer.h"
#include "mozilla/widget/IMEData.h"
#include "nsAboutProtocolUtils.h"
#include "nsArrayUtils.h"
#include "nsAtomHashKeys.h"
#include "nsAttrName.h"
#include "nsAttrValue.h"
#include "nsAttrValueInlines.h"
#include "nsBaseHashtable.h"
#include "nsCCUncollectableMarker.h"
#include "nsCOMPtr.h"
#include "nsCRT.h"
#include "nsCRTGlue.h"
#include "nsCanvasFrame.h"
#include "nsCaseTreatment.h"
#include "nsCharSeparatedTokenizer.h"
#include "nsCharTraits.h"
#include "nsCompatibility.h"
#include "nsComponentManagerUtils.h"
#include "nsContainerFrame.h"
#include "nsContentCreatorFunctions.h"
#include "nsContentDLF.h"
#include "nsContentList.h"
#include "nsContentListDeclarations.h"
#include "nsContentPolicyUtils.h"
#include "nsCoord.h"
#include "nsCycleCollectionNoteChild.h"
#include "nsDOMMutationObserver.h"
#include "nsDOMString.h"
#include "nsTHashMap.h"
#include "nsDebug.h"
#include "nsDocShell.h"
#include "nsDocShellCID.h"
#include "nsError.h"
#include "nsFocusManager.h"
#include "nsFrameList.h"
#include "nsFrameLoader.h"
#include "nsFrameLoaderOwner.h"
#include "nsGenericHTMLElement.h"
#include "nsGkAtoms.h"
#include "nsGlobalWindowInner.h"
#include "nsGlobalWindowOuter.h"
#include "nsHTMLDocument.h"
#include "nsHTMLTags.h"
#include "nsHashKeys.h"
#include "nsHtml5StringParser.h"
#include "nsIAboutModule.h"
#include "nsIAnonymousContentCreator.h"
#include "nsIAppShell.h"
#include "nsIArray.h"
#include "nsIAsyncVerifyRedirectCallback.h"
#include "nsIBidiKeyboard.h"
#include "nsIBrowser.h"
#include "nsICacheInfoChannel.h"
#include "nsICachingChannel.h"
#include "nsICategoryManager.h"
#include "nsIChannel.h"
#include "nsIChannelEventSink.h"
#include "nsIClassifiedChannel.h"
#include "nsIConsoleService.h"
#include "nsIContent.h"
#include "nsIContentInlines.h"
#include "nsIContentPolicy.h"
#include "nsIContentSecurityPolicy.h"
#include "nsIContentSink.h"
#include "nsIDOMWindowUtils.h"
#include "nsIDocShell.h"
#include "nsIDocShellTreeItem.h"
#include "nsIDocumentEncoder.h"
#include "nsIDocumentLoaderFactory.h"
#include "nsIDocumentViewer.h"
#include "nsIDragService.h"
#include "nsIDragSession.h"
#include "nsIFile.h"
#include "nsIFocusManager.h"
#include "nsIFormControl.h"
#include "nsIFragmentContentSink.h"
#include "nsIFrame.h"
#include "nsIGlobalObject.h"
#include "nsIHttpChannel.h"
#include "nsIHttpChannelInternal.h"
#include "nsIIOService.h"
#include "nsIImageLoadingContent.h"
#include "nsIInputStream.h"
#include "nsIInterfaceRequestor.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsILoadContext.h"
#include "nsILoadGroup.h"
#include "nsILoadInfo.h"
#include "nsIMIMEService.h"
#include "nsIMemoryReporter.h"
#include "nsINetUtil.h"
#include "nsINode.h"
#include "nsIObjectLoadingContent.h"
#include "nsIObserver.h"
#include "nsIObserverService.h"
#include "nsIParserUtils.h"
#include "nsIPermissionManager.h"
#include "nsIPrincipal.h"
#include "nsIProperties.h"
#include "nsIProtocolHandler.h"
#include "nsIRequest.h"
#include "nsIRunnable.h"
#include "nsIScreen.h"
#include "nsIScriptError.h"
#include "nsIScriptGlobalObject.h"
#include "nsIScriptObjectPrincipal.h"
#include "nsIScriptSecurityManager.h"
#include "nsISerialEventTarget.h"
#include "nsIStreamConverter.h"
#include "nsIStreamConverterService.h"
#include "nsIStringBundle.h"
#include "nsISupports.h"
#include "nsISupportsPrimitives.h"
#include "nsISupportsUtils.h"
#include "nsITransferable.h"
#include "nsIURI.h"
#include "nsIURIMutator.h"
#if defined(MOZ_THUNDERBIRD) || defined(MOZ_SUITE)
#  include "nsIURIWithSpecialOrigin.h"
#endif
#include "nsIUserIdleServiceInternal.h"
#include "nsIWeakReferenceUtils.h"
#include "nsIWebNavigation.h"
#include "nsIWebNavigationInfo.h"
#include "nsIWidget.h"
#include "nsIWindowMediator.h"
#include "nsIXPConnect.h"
#include "nsJSPrincipals.h"
#include "nsJSUtils.h"
#include "nsLayoutUtils.h"
#include "nsLiteralString.h"
#include "nsMargin.h"
#include "nsMimeTypes.h"
#include "nsNameSpaceManager.h"
#include "nsNetCID.h"
#include "nsNetUtil.h"
#include "nsNodeInfoManager.h"
#include "nsPIDOMWindow.h"
#include "nsPIDOMWindowInlines.h"
#include "nsParser.h"
#include "nsParserConstants.h"
#include "nsPoint.h"
#include "nsPointerHashKeys.h"
#include "nsPresContext.h"
#include "nsQueryFrame.h"
#include "nsQueryObject.h"
#include "nsRange.h"
#include "nsRefPtrHashtable.h"
#include "nsSandboxFlags.h"
#include "nsScriptSecurityManager.h"
#include "nsServiceManagerUtils.h"
#include "nsStreamUtils.h"
#include "nsString.h"
#include "nsStringBundle.h"
#include "nsStringFlags.h"
#include "nsStringFwd.h"
#include "nsStringIterator.h"
#include "nsStringStream.h"
#include "nsTArray.h"
#include "nsTLiteralString.h"
#include "nsTPromiseFlatString.h"
#include "nsTStringRepr.h"
#include "nsTextFragment.h"
#include "nsTextNode.h"
#include "nsThreadManager.h"
#include "nsThreadUtils.h"
#include "nsTreeSanitizer.h"
#include "nsUGenCategory.h"
#include "nsURLHelper.h"
#include "nsUnicodeProperties.h"
#include "nsVariant.h"
#include "nsWidgetsCID.h"
#include "nsView.h"
#include "nsViewManager.h"
#include "nsXPCOM.h"
#include "nsXPCOMCID.h"
#include "nsXULAppAPI.h"
#include "nsXULElement.h"
#include "nsXULPopupManager.h"
#include "nscore.h"
#include "prinrval.h"
#include "xpcprivate.h"
#include "xpcpublic.h"

#if defined(XP_WIN)
// Undefine LoadImage to prevent naming conflict with Windows.
#  undef LoadImage
#endif

extern "C" int MOZ_XMLTranslateEntity(const char* ptr, const char* end,
                                      const char** next, char16_t* result);
extern "C" int MOZ_XMLCheckQName(const char* ptr, const char* end, int ns_aware,
                                 const char** colon);

using namespace mozilla::dom;
using namespace mozilla::ipc;
using namespace mozilla::gfx;
using namespace mozilla::layers;
using namespace mozilla::widget;
using namespace mozilla;

const char kLoadAsData[] = "loadAsData";

nsIXPConnect* nsContentUtils::sXPConnect;
nsIScriptSecurityManager* nsContentUtils::sSecurityManager;
nsIPrincipal* nsContentUtils::sSystemPrincipal;
nsIPrincipal* nsContentUtils::sNullSubjectPrincipal;
nsIPrincipal* nsContentUtils::sFingerprintingProtectionPrincipal;
nsIConsoleService* nsContentUtils::sConsoleService;

static nsTHashMap<RefPtr<nsAtom>, EventNameMapping>* sAtomEventTable;
static nsTHashMap<nsStringHashKey, EventNameMapping>* sStringEventTable;
static nsTArray<RefPtr<nsAtom>>* sUserDefinedEvents;
nsIStringBundleService* nsContentUtils::sStringBundleService;

static StaticRefPtr<nsIStringBundle>
    sStringBundles[nsContentUtils::PropertiesFile_COUNT];

nsIContentPolicy* nsContentUtils::sContentPolicyService;
bool nsContentUtils::sTriedToGetContentPolicy = false;
StaticRefPtr<nsIBidiKeyboard> nsContentUtils::sBidiKeyboard;
uint32_t nsContentUtils::sScriptBlockerCount = 0;
uint32_t nsContentUtils::sDOMNodeRemovedSuppressCount = 0;
AutoTArray<nsCOMPtr<nsIRunnable>, 8>* nsContentUtils::sBlockedScriptRunners =
    nullptr;
uint32_t nsContentUtils::sRunnersCountAtFirstBlocker = 0;
nsIInterfaceRequestor* nsContentUtils::sSameOriginChecker = nullptr;

bool nsContentUtils::sIsHandlingKeyBoardEvent = false;

nsString* nsContentUtils::sShiftText = nullptr;
nsString* nsContentUtils::sControlText = nullptr;
nsString* nsContentUtils::sCommandOrWinText = nullptr;
nsString* nsContentUtils::sAltText = nullptr;
nsString* nsContentUtils::sModifierSeparator = nullptr;

bool nsContentUtils::sInitialized = false;
#ifndef RELEASE_OR_BETA
bool nsContentUtils::sBypassCSSOMOriginCheck = false;
#endif

nsCString* nsContentUtils::sJSScriptBytecodeMimeType = nullptr;
nsCString* nsContentUtils::sJSModuleBytecodeMimeType = nullptr;

nsContentUtils::UserInteractionObserver*
    nsContentUtils::sUserInteractionObserver = nullptr;

nsHtml5StringParser* nsContentUtils::sHTMLFragmentParser = nullptr;
nsParser* nsContentUtils::sXMLFragmentParser = nullptr;
nsIFragmentContentSink* nsContentUtils::sXMLFragmentSink = nullptr;
bool nsContentUtils::sFragmentParsingActive = false;

bool nsContentUtils::sMayHaveFormCheckboxStateChangeListeners = false;
bool nsContentUtils::sMayHaveFormRadioStateChangeListeners = false;

mozilla::LazyLogModule nsContentUtils::gResistFingerprintingLog(
    "nsResistFingerprinting");
mozilla::LazyLogModule nsContentUtils::sDOMDumpLog("Dump");

int32_t nsContentUtils::sInnerOrOuterWindowCount = 0;
uint32_t nsContentUtils::sInnerOrOuterWindowSerialCounter = 0;

template Maybe<int32_t> nsContentUtils::ComparePoints(
    const RangeBoundary& aFirstBoundary, const RangeBoundary& aSecondBoundary);
template Maybe<int32_t> nsContentUtils::ComparePoints(
    const RangeBoundary& aFirstBoundary,
    const RawRangeBoundary& aSecondBoundary);
template Maybe<int32_t> nsContentUtils::ComparePoints(
    const RawRangeBoundary& aFirstBoundary,
    const RangeBoundary& aSecondBoundary);
template Maybe<int32_t> nsContentUtils::ComparePoints(
    const RawRangeBoundary& aFirstBoundary,
    const RawRangeBoundary& aSecondBoundary);

template int32_t nsContentUtils::ComparePoints_Deprecated(
    const RangeBoundary& aFirstBoundary, const RangeBoundary& aSecondBoundary,
    bool* aDisconnected);
template int32_t nsContentUtils::ComparePoints_Deprecated(
    const RangeBoundary& aFirstBoundary,
    const RawRangeBoundary& aSecondBoundary, bool* aDisconnected);
template int32_t nsContentUtils::ComparePoints_Deprecated(
    const RawRangeBoundary& aFirstBoundary,
    const RangeBoundary& aSecondBoundary, bool* aDisconnected);
template int32_t nsContentUtils::ComparePoints_Deprecated(
    const RawRangeBoundary& aFirstBoundary,
    const RawRangeBoundary& aSecondBoundary, bool* aDisconnected);

// Subset of
// http://www.whatwg.org/specs/web-apps/current-work/#autofill-field-name
enum AutocompleteUnsupportedFieldName : uint8_t {
#define AUTOCOMPLETE_UNSUPPORTED_FIELD_NAME(name_, value_) \
  eAutocompleteUnsupportedFieldName_##name_,
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_UNSUPPORTED_FIELD_NAME
};

enum AutocompleteNoPersistFieldName : uint8_t {
#define AUTOCOMPLETE_NO_PERSIST_FIELD_NAME(name_, value_) \
  eAutocompleteNoPersistFieldName_##name_,
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_NO_PERSIST_FIELD_NAME
};

enum AutocompleteUnsupportFieldContactHint : uint8_t {
#define AUTOCOMPLETE_UNSUPPORTED_FIELD_CONTACT_HINT(name_, value_) \
  eAutocompleteUnsupportedFieldContactHint_##name_,
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_UNSUPPORTED_FIELD_CONTACT_HINT
};

enum AutocompleteFieldName : uint8_t {
#define AUTOCOMPLETE_FIELD_NAME(name_, value_) eAutocompleteFieldName_##name_,
#define AUTOCOMPLETE_CONTACT_FIELD_NAME(name_, value_) \
  AUTOCOMPLETE_FIELD_NAME(name_, value_)
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_FIELD_NAME
#undef AUTOCOMPLETE_CONTACT_FIELD_NAME
};

enum AutocompleteFieldHint : uint8_t {
#define AUTOCOMPLETE_FIELD_HINT(name_, value_) eAutocompleteFieldHint_##name_,
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_FIELD_HINT
};

enum AutocompleteFieldContactHint : uint8_t {
#define AUTOCOMPLETE_FIELD_CONTACT_HINT(name_, value_) \
  eAutocompleteFieldContactHint_##name_,
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_FIELD_CONTACT_HINT
};

enum AutocompleteCredentialType : uint8_t {
#define AUTOCOMPLETE_CREDENTIAL_TYPE(name_, value_) \
  eAutocompleteCredentialType_##name_,
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_CREDENTIAL_TYPE
};

enum AutocompleteCategory {
#define AUTOCOMPLETE_CATEGORY(name_, value_) eAutocompleteCategory_##name_,
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_CATEGORY
};

static const nsAttrValue::EnumTable kAutocompleteUnsupportedFieldNameTable[] = {
#define AUTOCOMPLETE_UNSUPPORTED_FIELD_NAME(name_, value_) \
  {value_, eAutocompleteUnsupportedFieldName_##name_},
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_UNSUPPORTED_FIELD_NAME
    {nullptr, 0}};

static const nsAttrValue::EnumTable kAutocompleteNoPersistFieldNameTable[] = {
#define AUTOCOMPLETE_NO_PERSIST_FIELD_NAME(name_, value_) \
  {value_, eAutocompleteNoPersistFieldName_##name_},
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_NO_PERSIST_FIELD_NAME
    {nullptr, 0}};

static const nsAttrValue::EnumTable
    kAutocompleteUnsupportedContactFieldHintTable[] = {
#define AUTOCOMPLETE_UNSUPPORTED_FIELD_CONTACT_HINT(name_, value_) \
  {value_, eAutocompleteUnsupportedFieldContactHint_##name_},
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_UNSUPPORTED_FIELD_CONTACT_HINT
        {nullptr, 0}};

static const nsAttrValue::EnumTable kAutocompleteFieldNameTable[] = {
#define AUTOCOMPLETE_FIELD_NAME(name_, value_) \
  {value_, eAutocompleteFieldName_##name_},
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_FIELD_NAME
    {nullptr, 0}};

static const nsAttrValue::EnumTable kAutocompleteContactFieldNameTable[] = {
#define AUTOCOMPLETE_CONTACT_FIELD_NAME(name_, value_) \
  {value_, eAutocompleteFieldName_##name_},
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_CONTACT_FIELD_NAME
    {nullptr, 0}};

static const nsAttrValue::EnumTable kAutocompleteFieldHintTable[] = {
#define AUTOCOMPLETE_FIELD_HINT(name_, value_) \
  {value_, eAutocompleteFieldHint_##name_},
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_FIELD_HINT
    {nullptr, 0}};

static const nsAttrValue::EnumTable kAutocompleteContactFieldHintTable[] = {
#define AUTOCOMPLETE_FIELD_CONTACT_HINT(name_, value_) \
  {value_, eAutocompleteFieldContactHint_##name_},
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_FIELD_CONTACT_HINT
    {nullptr, 0}};

static const nsAttrValue::EnumTable kAutocompleteCredentialTypeTable[] = {
#define AUTOCOMPLETE_CREDENTIAL_TYPE(name_, value_) \
  {value_, eAutocompleteCredentialType_##name_},
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_CREDENTIAL_TYPE
    {nullptr, 0}};

namespace {

static PLDHashTable* sEventListenerManagersHash;

// A global hashtable to for keeping the arena alive for cross docGroup node
// adoption.
static nsRefPtrHashtable<nsPtrHashKey<const nsINode>, mozilla::dom::DOMArena>*
    sDOMArenaHashtable;

class DOMEventListenerManagersHashReporter final : public nsIMemoryReporter {
  MOZ_DEFINE_MALLOC_SIZE_OF(MallocSizeOf)

  ~DOMEventListenerManagersHashReporter() = default;

public:
  NS_DECL_ISUPPORTS

  NS_IMETHOD CollectReports(nsIHandleReportCallback* aHandleReport,
                            nsISupports* aData, bool aAnonymize) override {
    // We don't measure the |EventListenerManager| objects pointed to by the
    // entries because those references are non-owning.
    int64_t amount =
        sEventListenerManagersHash
            ? sEventListenerManagersHash->ShallowSizeOfIncludingThis(
                  MallocSizeOf)
            : 0;

    MOZ_COLLECT_REPORT(
        "explicit/dom/event-listener-managers-hash", KIND_HEAP, UNITS_BYTES,
        amount, "Memory used by the event listener manager's hash table.");

    return NS_OK;
  }
};

NS_IMPL_ISUPPORTS(DOMEventListenerManagersHashReporter, nsIMemoryReporter)

class EventListenerManagerMapEntry : public PLDHashEntryHdr {
public:
  explicit EventListenerManagerMapEntry(const void* aKey) : mKey(aKey) {}

  ~EventListenerManagerMapEntry() {
    NS_ASSERTION(!mListenerManager, "caller must release and disconnect ELM");
  }

protected:          // declared protected to silence clang warnings
  const void* mKey;  // must be first, to look like PLDHashEntryStub

public:
  RefPtr<EventListenerManager> mListenerManager;
};

static void EventListenerManagerHashInitEntry(PLDHashEntryHdr* entry,
                                              const void* key) {
  // Initialize the entry with placement new
  new (entry) EventListenerManagerMapEntry(key);
}

static void EventListenerManagerHashClearEntry(PLDHashTable* table,
                                               PLDHashEntryHdr* entry) {
  EventListenerManagerMapEntry* lm =
      static_cast<EventListenerManagerMapEntry*>(entry);

  // Let the EventListenerManagerMapEntry clean itself up...
  lm->~EventListenerManagerMapEntry();
}

class SameOriginCheckerImpl final : public nsIChannelEventSink,
                                    public nsIInterfaceRequestor {
  ~SameOriginCheckerImpl() = default;

  NS_DECL_ISUPPORTS
  NS_DECL_NSICHANNELEVENTSINK
  NS_DECL_NSIINTERFACEREQUESTOR
};

}  // namespace

void AutoSuppressEventHandling::SuppressDocument(Document* aDoc) {
  // Note: Document::SuppressEventHandling will also automatically suppress
  // event handling for any in-process sub-documents. However, since we need
  // to deal with cases where remote BrowsingContexts may be interleaved
  // with in-process ones, we still need to walk the entire tree ourselves.
  // This may be slightly redundant in some cases, but since event handling
  // suppressions maintain a count of current blockers, it does not cause
  // any problems.
  aDoc->SuppressEventHandling();
}

void AutoSuppressEventHandling::UnsuppressDocument(Document* aDoc) {
  aDoc->UnsuppressEventHandlingAndFireEvents(true);
}

AutoSuppressEventHandling::~AutoSuppressEventHandling() {
  UnsuppressDocuments();
}

void AutoSuppressEventHandlingAndSuspend::SuppressDocument(Document* aDoc) {
  AutoSuppressEventHandling::SuppressDocument(aDoc);
  if (nsCOMPtr<nsPIDOMWindowInner> win = aDoc->GetInnerWindow()) {
    win->Suspend();
    mWindows.AppendElement(win);
  }
}

AutoSuppressEventHandlingAndSuspend::~AutoSuppressEventHandlingAndSuspend() {
  for (const auto& win : mWindows) {
    win->Resume();
  }
}

/**
* This class is used to determine whether or not the user is currently
* interacting with the browser. It listens to observer events to toggle the
* value of the sUserActive static.
*
* This class is an internal implementation detail.
* nsContentUtils::GetUserIsInteracting() should be used to access current
* user interaction status.
*/
class nsContentUtils::UserInteractionObserver final
    : public nsIObserver,
      public BackgroundHangAnnotator {
public:
  NS_DECL_ISUPPORTS
  NS_DECL_NSIOBSERVER

  void Init();
  void Shutdown();
  void AnnotateHang(BackgroundHangAnnotations& aAnnotations) override;

  static Atomic<bool> sUserActive;

private:
  ~UserInteractionObserver() = default;
};

static constexpr nsLiteralCString kRfpPrefs[] = {
    "privacy.resistFingerprinting"_ns,
    "privacy.resistFingerprinting.pbmode"_ns,
    "privacy.fingerprintingProtection"_ns,
    "privacy.fingerprintingProtection.pbmode"_ns,
    "privacy.fingerprintingProtection.overrides"_ns,
};

static void RecomputeResistFingerprintingAllDocs(const char*, void*) {
  AutoTArray<RefPtr<BrowsingContextGroup>, 5> bcGroups;
  BrowsingContextGroup::GetAllGroups(bcGroups);
  for (auto& bcGroup : bcGroups) {
    AutoTArray<DocGroup*, 5> docGroups;
    bcGroup->GetDocGroups(docGroups);
    for (auto* docGroup : docGroups) {
      for (Document* doc : *docGroup) {
        if (doc->RecomputeResistFingerprinting()) {
          if (auto* pc = doc->GetPresContext()) {
            pc->MediaFeatureValuesChanged(
                {MediaFeatureChangeReason::PreferenceChange},
                MediaFeatureChangePropagation::JustThisDocument);
          }
        }
      }
    }
  }
}

// static
nsresult nsContentUtils::Init() {
  if (sInitialized) {
    NS_WARNING("Init() called twice");

    return NS_OK;
  }

  nsHTMLTags::AddRefTable();

  sXPConnect = nsXPConnect::XPConnect();
  // We hold a strong ref to sXPConnect to ensure that it does not go away until
  // nsLayoutStatics::Shutdown is happening.  Otherwise ~nsXPConnect can be
  // triggered by xpcModuleDtor late in shutdown and cause crashes due to
  // various stuff already being torn down by then.  Note that this means that
  // we are effectively making sure that if we leak nsLayoutStatics then we also
  // leak nsXPConnect.
  NS_ADDREF(sXPConnect);

  sSecurityManager = nsScriptSecurityManager::GetScriptSecurityManager();
  if (!sSecurityManager) return NS_ERROR_FAILURE;
  NS_ADDREF(sSecurityManager);

  sSecurityManager->GetSystemPrincipal(&sSystemPrincipal);
  MOZ_ASSERT(sSystemPrincipal);

  RefPtr<NullPrincipal> nullPrincipal =
      NullPrincipal::CreateWithoutOriginAttributes();
  if (!nullPrincipal) {
    return NS_ERROR_FAILURE;
  }

  nullPrincipal.forget(&sNullSubjectPrincipal);

  RefPtr<nsIPrincipal> fingerprintingProtectionPrincipal =
      BasePrincipal::CreateContentPrincipal(
          "about:fingerprintingprotection"_ns);
  if (!fingerprintingProtectionPrincipal) {
    return NS_ERROR_FAILURE;
  }

  fingerprintingProtectionPrincipal.forget(&sFingerprintingProtectionPrincipal);

  if (!InitializeEventTable()) return NS_ERROR_FAILURE;

  if (!sEventListenerManagersHash) {
    static const PLDHashTableOps hash_table_ops = {
        PLDHashTable::HashVoidPtrKeyStub, PLDHashTable::MatchEntryStub,
        PLDHashTable::MoveEntryStub, EventListenerManagerHashClearEntry,
        EventListenerManagerHashInitEntry};

    sEventListenerManagersHash =
        new PLDHashTable(&hash_table_ops, sizeof(EventListenerManagerMapEntry));

    RegisterStrongMemoryReporter(new DOMEventListenerManagersHashReporter());
  }

  sBlockedScriptRunners = new AutoTArray<nsCOMPtr<nsIRunnable>, 8>;

#ifndef RELEASE_OR_BETA
  sBypassCSSOMOriginCheck = getenv("MOZ_BYPASS_CSSOM_ORIGIN_CHECK");
#endif

  Element::InitCCCallbacks();

  RefPtr<nsRFPService> rfpService = nsRFPService::GetOrCreate();
  MOZ_ASSERT(rfpService);

  if (XRE_IsParentProcess()) {
    AsyncPrecreateStringBundles();

#if defined(MOZ_WIDGET_ANDROID)
    // On Android, at-shutdown ping submission isn't reliable
    // (( because, on Android, we usually get killed, not shut down )).
    // To have a chance at submitting the ping, aim for idle after startup.
    nsresult rv = NS_DispatchToCurrentThreadQueue(
        NS_NewRunnableFunction(
            "AndroidUseCounterPingSubmitter",
            []() { glean_pings::UseCounters.Submit("idle_startup"_ns); }),
        EventQueuePriority::Idle);
    // This is mostly best-effort, so if it goes awry, just log.
    Unused << NS_WARN_IF(NS_FAILED(rv));
#endif  // defined(MOZ_WIDGET_ANDROID)

    RunOnShutdown(
        [&] { glean_pings::UseCounters.Submit("app_shutdown_confirmed"_ns); },
        ShutdownPhase::AppShutdownConfirmed);
  }

  RefPtr<UserInteractionObserver> uio = new UserInteractionObserver();
  uio->Init();
  uio.forget(&sUserInteractionObserver);

  for (const auto& pref : kRfpPrefs) {
    Preferences::RegisterCallback(RecomputeResistFingerprintingAllDocs, pref);
  }

  sInitialized = true;

  return NS_OK;
}

bool nsContentUtils::InitJSBytecodeMimeType() {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(!sJSScriptBytecodeMimeType);
  MOZ_ASSERT(!sJSModuleBytecodeMimeType);

  JS::BuildIdCharVector jsBuildId;
  if (!JS::GetScriptTranscodingBuildId(&jsBuildId)) {
    return false;
  }

  nsDependentCSubstring jsBuildIdStr(jsBuildId.begin(), jsBuildId.length());
  sJSScriptBytecodeMimeType =
      new nsCString("javascript/moz-script-bytecode-"_ns + jsBuildIdStr);
  sJSModuleBytecodeMimeType =
      new nsCString("javascript/moz-module-bytecode-"_ns + jsBuildIdStr);
  return true;
}

void nsContentUtils::GetShiftText(nsAString& text) {
  if (!sShiftText) InitializeModifierStrings();
  text.Assign(*sShiftText);
}

void nsContentUtils::GetControlText(nsAString& text) {
  if (!sControlText) InitializeModifierStrings();
  text.Assign(*sControlText);
}

void nsContentUtils::GetCommandOrWinText(nsAString& text) {
  if (!sCommandOrWinText) {
    InitializeModifierStrings();
  }
  text.Assign(*sCommandOrWinText);
}

void nsContentUtils::GetAltText(nsAString& text) {
  if (!sAltText) InitializeModifierStrings();
  text.Assign(*sAltText);
}

void nsContentUtils::GetModifierSeparatorText(nsAString& text) {
  if (!sModifierSeparator) InitializeModifierStrings();
  text.Assign(*sModifierSeparator);
}

void nsContentUtils::InitializeModifierStrings() {
  // load the display strings for the keyboard accelerators
  nsCOMPtr<nsIStringBundleService> bundleService =
      mozilla::components::StringBundle::Service();
  nsCOMPtr<nsIStringBundle> bundle;
  DebugOnly<nsresult> rv = NS_OK;
  if (bundleService) {
    rv = bundleService->CreateBundle(
        "chrome://global-platform/locale/platformKeys.properties",
        getter_AddRefs(bundle));
  }

  NS_ASSERTION(
      NS_SUCCEEDED(rv) && bundle,
      "chrome://global/locale/platformKeys.properties could not be loaded");
  nsAutoString shiftModifier;
  nsAutoString commandOrWinModifier;
  nsAutoString altModifier;
  nsAutoString controlModifier;
  nsAutoString modifierSeparator;
  if (bundle) {
    // macs use symbols for each modifier key, so fetch each from the bundle,
    // which also covers i18n
    bundle->GetStringFromName("VK_SHIFT", shiftModifier);
    bundle->GetStringFromName("VK_COMMAND_OR_WIN", commandOrWinModifier);
    bundle->GetStringFromName("VK_ALT", altModifier);
    bundle->GetStringFromName("VK_CONTROL", controlModifier);
    bundle->GetStringFromName("MODIFIER_SEPARATOR", modifierSeparator);
  }
  // if any of these don't exist, we get  an empty string
  sShiftText = new nsString(shiftModifier);
  sCommandOrWinText = new nsString(commandOrWinModifier);
  sAltText = new nsString(altModifier);
  sControlText = new nsString(controlModifier);
  sModifierSeparator = new nsString(modifierSeparator);
}

mozilla::EventClassID nsContentUtils::GetEventClassIDFromMessage(
    EventMessage aEventMessage) {
  switch (aEventMessage) {
#define MESSAGE_TO_EVENT(name_, message_, type_, struct_) \
  case message_:                                          \
    return struct_;
#include "mozilla/EventNameList.h"
#undef MESSAGE_TO_EVENT
    default:
      MOZ_ASSERT_UNREACHABLE("Invalid event message?");
      return eBasicEventClass;
  }
}

bool nsContentUtils::IsExternalProtocol(nsIURI* aURI) {
  bool doesNotReturnData = false;
  nsresult rv = NS_URIChainHasFlags(
      aURI, nsIProtocolHandler::URI_DOES_NOT_RETURN_DATA, &doesNotReturnData);
  return NS_SUCCEEDED(rv) && doesNotReturnData;
}

/* static */
nsAtom* nsContentUtils::GetEventTypeFromMessage(EventMessage aEventMessage) {
  switch (aEventMessage) {
#define MESSAGE_TO_EVENT(name_, message_, type_, struct_) \
  case message_:                                          \
    return nsGkAtoms::on##name_;
#include "mozilla/EventNameList.h"
#undef MESSAGE_TO_EVENT
    default:
      return nullptr;
  }
}

bool nsContentUtils::InitializeEventTable() {
  NS_ASSERTION(!sAtomEventTable, "EventTable already initialized!");
  NS_ASSERTION(!sStringEventTable, "EventTable already initialized!");

  static const EventNameMapping eventArray[] = {
#define EVENT(name_, _message, _type, _class) \
  {nsGkAtoms::on##name_, _type, _message, _class},
#define WINDOW_ONLY_EVENT EVENT
#define DOCUMENT_ONLY_EVENT EVENT
#define NON_IDL_EVENT EVENT
#include "mozilla/EventNameList.h"
#undef WINDOW_ONLY_EVENT
#undef NON_IDL_EVENT
#undef EVENT
      {nullptr}};

  sAtomEventTable =
      new nsTHashMap<RefPtr<nsAtom>, EventNameMapping>(std::size(eventArray));
  sStringEventTable =
      new nsTHashMap<nsStringHashKey, EventNameMapping>(std::size(eventArray));
  sUserDefinedEvents = new nsTArray<RefPtr<nsAtom>>(64);

  // Subtract one from the length because of the trailing null
  for (uint32_t i = 0; i < std::size(eventArray) - 1; ++i) {
    MOZ_ASSERT(!sAtomEventTable->Contains(eventArray[i].mAtom),
               "Double-defining event name; fix your EventNameList.h");
    sAtomEventTable->InsertOrUpdate(eventArray[i].mAtom, eventArray[i]);
    sStringEventTable->InsertOrUpdate(
        Substring(nsDependentAtomString(eventArray[i].mAtom), 2),
        eventArray[i]);
  }

  return true;
}

void nsContentUtils::InitializeTouchEventTable() {
  static bool sEventTableInitialized = false;
  if (!sEventTableInitialized && sAtomEventTable && sStringEventTable) {
    sEventTableInitialized = true;
    static const EventNameMapping touchEventArray[] = {
#define EVENT(name_, _message, _type, _class)
#define TOUCH_EVENT(name_, _message, _type, _class) \
  {nsGkAtoms::on##name_, _type, _message, _class},
#include "mozilla/EventNameList.h"
#undef TOUCH_EVENT
#undef EVENT
        {nullptr}};
    // Subtract one from the length because of the trailing null
    for (uint32_t i = 0; i < std::size(touchEventArray) - 1; ++i) {
      sAtomEventTable->InsertOrUpdate(touchEventArray[i].mAtom,
                                      touchEventArray[i]);
      sStringEventTable->InsertOrUpdate(
          Substring(nsDependentAtomString(touchEventArray[i].mAtom), 2),
          touchEventArray[i]);
    }
  }
}

static bool Is8bit(const nsAString& aString) {
  static const char16_t EIGHT_BIT = char16_t(~0x00FF);

  for (nsAString::const_char_iterator start = aString.BeginReading(),
                                      end = aString.EndReading();
       start != end; ++start) {
    if (*start & EIGHT_BIT) {
      return false;
    }
  }

  return true;
}

nsresult nsContentUtils::Btoa(const nsAString& aBinaryData,
                              nsAString& aAsciiBase64String) {
  if (!Is8bit(aBinaryData)) {
    aAsciiBase64String.Truncate();
    return NS_ERROR_DOM_INVALID_CHARACTER_ERR;
  }

  return Base64Encode(aBinaryData, aAsciiBase64String);
}

nsresult nsContentUtils::Atob(const nsAString& aAsciiBase64String,
                              nsAString& aBinaryData) {
  if (!Is8bit(aAsciiBase64String)) {
    aBinaryData.Truncate();
    return NS_ERROR_DOM_INVALID_CHARACTER_ERR;
  }

  const char16_t* start = aAsciiBase64String.BeginReading();
  const char16_t* cur = start;
  const char16_t* end = aAsciiBase64String.EndReading();
  bool hasWhitespace = false;

  while (cur < end) {
    if (nsContentUtils::IsHTMLWhitespace(*cur)) {
      hasWhitespace = true;
      break;
    }
    cur++;
  }

  nsresult rv;

  if (hasWhitespace) {
    nsString trimmedString;

    if (!trimmedString.SetCapacity(aAsciiBase64String.Length(), fallible)) {
      return NS_ERROR_DOM_INVALID_CHARACTER_ERR;
    }

    trimmedString.Append(start, cur - start);

    while (cur < end) {
      if (!nsContentUtils::IsHTMLWhitespace(*cur)) {
        trimmedString.Append(*cur);
      }
      cur++;
    }
    rv = Base64Decode(trimmedString, aBinaryData);
  } else {
    rv = Base64Decode(aAsciiBase64String, aBinaryData);
  }

  if (NS_FAILED(rv) && rv == NS_ERROR_INVALID_ARG) {
    return NS_ERROR_DOM_INVALID_CHARACTER_ERR;
  }
  return rv;
}

bool nsContentUtils::IsAutocompleteEnabled(
    mozilla::dom::HTMLInputElement* aInput) {
  MOZ_ASSERT(aInput, "aInput should not be null!");

  nsAutoString autocomplete;
  aInput->GetAutocomplete(autocomplete);

  if (autocomplete.IsEmpty()) {
    auto* form = aInput->GetForm();
    if (!form) {
      return true;
    }

    form->GetAutocomplete(autocomplete);
  }

  return !autocomplete.EqualsLiteral("off");
}

nsContentUtils::AutocompleteAttrState
nsContentUtils::SerializeAutocompleteAttribute(
    const nsAttrValue* aAttr, nsAString& aResult,
    AutocompleteAttrState aCachedState) {
  if (!aAttr ||
      aCachedState == nsContentUtils::eAutocompleteAttrState_Invalid) {
    return aCachedState;
  }

  if (aCachedState == nsContentUtils::eAutocompleteAttrState_Valid) {
    uint32_t atomCount = aAttr->GetAtomCount();
    for (uint32_t i = 0; i < atomCount; i++) {
      if (i != 0) {
        aResult.Append(' ');
      }
      aResult.Append(nsDependentAtomString(aAttr->AtomAt(i)));
    }
    nsContentUtils::ASCIIToLower(aResult);
    return aCachedState;
  }

  aResult.Truncate();

  mozilla::dom::AutocompleteInfo info;
  AutocompleteAttrState state =
      InternalSerializeAutocompleteAttribute(aAttr, info);
  if (state == eAutocompleteAttrState_Valid) {
    // Concatenate the info fields.
    aResult = info.mSection;

    if (!info.mAddressType.IsEmpty()) {
      if (!aResult.IsEmpty()) {
        aResult += ' ';
      }
      aResult += info.mAddressType;
    }

    if (!info.mContactType.IsEmpty()) {
      if (!aResult.IsEmpty()) {
        aResult += ' ';
      }
      aResult += info.mContactType;
    }

    if (!info.mFieldName.IsEmpty()) {
      if (!aResult.IsEmpty()) {
        aResult += ' ';
      }
      aResult += info.mFieldName;
    }

    // The autocomplete attribute value "webauthn" is interpreted as both a
    // field name and a credential type. The corresponding IDL-exposed autofill
    // value is "webauthn", not "webauthn webauthn".
    if (!info.mCredentialType.IsEmpty() &&
        !(info.mCredentialType.Equals(u"webauthn"_ns) &&
          info.mCredentialType.Equals(aResult))) {
      if (!aResult.IsEmpty()) {
        aResult += ' ';
      }
      aResult += info.mCredentialType;
    }
  }

  return state;
}

nsContentUtils::AutocompleteAttrState
nsContentUtils::SerializeAutocompleteAttribute(
    const nsAttrValue* aAttr, mozilla::dom::AutocompleteInfo& aInfo,
    AutocompleteAttrState aCachedState, bool aGrantAllValidValue) {
  if (!aAttr ||
      aCachedState == nsContentUtils::eAutocompleteAttrState_Invalid) {
    return aCachedState;
  }

  return InternalSerializeAutocompleteAttribute(aAttr, aInfo,
                                                aGrantAllValidValue);
}

/**
* Helper to validate the @autocomplete tokens.
*
* @return {AutocompleteAttrState} The state of the attribute (invalid/valid).
*/
nsContentUtils::AutocompleteAttrState
nsContentUtils::InternalSerializeAutocompleteAttribute(
    const nsAttrValue* aAttrVal, mozilla::dom::AutocompleteInfo& aInfo,
    bool aGrantAllValidValue) {
  // No autocomplete attribute so we are done
  if (!aAttrVal) {
    return eAutocompleteAttrState_Invalid;
  }

  uint32_t numTokens = aAttrVal->GetAtomCount();
  if (!numTokens || numTokens > INT32_MAX) {
    return eAutocompleteAttrState_Invalid;
  }

  uint32_t index = numTokens - 1;
  nsString tokenString = nsDependentAtomString(aAttrVal->AtomAt(index));
  AutocompleteCategory category;
  nsAttrValue enumValue;
  nsAutoString credentialTypeStr;

  bool result = enumValue.ParseEnumValue(
      tokenString, kAutocompleteCredentialTypeTable, false);
  if (result) {
    if (!enumValue.Equals(u"webauthn"_ns, eIgnoreCase) || numTokens > 5) {
      return eAutocompleteAttrState_Invalid;
    }
    enumValue.ToString(credentialTypeStr);
    ASCIIToLower(credentialTypeStr);
    // category is Credential and the indexth token is "webauthn"
    if (index == 0) {
      aInfo.mFieldName.Assign(credentialTypeStr);
      aInfo.mCredentialType.Assign(credentialTypeStr);
      return eAutocompleteAttrState_Valid;
    }

    --index;
    tokenString = nsDependentAtomString(aAttrVal->AtomAt(index));

    // Only the Normal and Contact categories are allowed with webauthn
    //  - disallow Credential
    if (enumValue.ParseEnumValue(tokenString, kAutocompleteCredentialTypeTable,
                                 false)) {
      return eAutocompleteAttrState_Invalid;
    }
    //  - disallow Off and Automatic
    if (enumValue.ParseEnumValue(tokenString, kAutocompleteFieldNameTable,
                                 false)) {
      if (enumValue.Equals(u"off"_ns, eIgnoreCase) ||
          enumValue.Equals(u"on"_ns, eIgnoreCase)) {
        return eAutocompleteAttrState_Invalid;
      }
    }

    // Proceed to process the remaining tokens as if "webauthn" was not present.
    // We need to decrement numTokens to enforce the correct per-category limits
    // on the maximum number of tokens.
    --numTokens;
  }

  bool unsupported = false;
  if (!aGrantAllValidValue) {
    unsupported = enumValue.ParseEnumValue(
        tokenString, kAutocompleteUnsupportedFieldNameTable, false);
    if (unsupported) {
      return eAutocompleteAttrState_Invalid;
    }
  }

  nsAutoString fieldNameStr;
  result =
      enumValue.ParseEnumValue(tokenString, kAutocompleteFieldNameTable, false);

  if (result) {
    // Off/Automatic/Normal categories.
    if (enumValue.Equals(u"off"_ns, eIgnoreCase) ||
        enumValue.Equals(u"on"_ns, eIgnoreCase)) {
      if (numTokens > 1) {
        return eAutocompleteAttrState_Invalid;
      }
      enumValue.ToString(fieldNameStr);
      ASCIIToLower(fieldNameStr);
      aInfo.mFieldName.Assign(fieldNameStr);
      aInfo.mCredentialType.Assign(credentialTypeStr);
      aInfo.mCanAutomaticallyPersist =
          !enumValue.Equals(u"off"_ns, eIgnoreCase);
      return eAutocompleteAttrState_Valid;
    }

    // Only allow on/off if form autofill @autocomplete values aren't enabled
    // and it doesn't grant all valid values.
    if (!StaticPrefs::dom_forms_autocomplete_formautofill() &&
        !aGrantAllValidValue) {
      return eAutocompleteAttrState_Invalid;
    }

    // Normal category
    if (numTokens > 3) {
      return eAutocompleteAttrState_Invalid;
    }
    category = eAutocompleteCategory_NORMAL;
  } else {  // Check if the last token is of the contact category instead.
    // Only allow on/off if form autofill @autocomplete values aren't enabled
    // and it doesn't grant all valid values.
    if (!StaticPrefs::dom_forms_autocomplete_formautofill() &&
        !aGrantAllValidValue) {
      return eAutocompleteAttrState_Invalid;
    }

    result = enumValue.ParseEnumValue(
        tokenString, kAutocompleteContactFieldNameTable, false);
    if (!result || numTokens > 4) {
      return eAutocompleteAttrState_Invalid;
    }

    category = eAutocompleteCategory_CONTACT;
  }

  enumValue.ToString(fieldNameStr);
  ASCIIToLower(fieldNameStr);

  aInfo.mFieldName.Assign(fieldNameStr);
  aInfo.mCredentialType.Assign(credentialTypeStr);
  aInfo.mCanAutomaticallyPersist = !enumValue.ParseEnumValue(
      tokenString, kAutocompleteNoPersistFieldNameTable, false);

  // We are done if this was the only token.
  if (numTokens == 1) {
    return eAutocompleteAttrState_Valid;
  }

  --index;
  tokenString = nsDependentAtomString(aAttrVal->AtomAt(index));

  if (category == eAutocompleteCategory_CONTACT) {
    if (!aGrantAllValidValue) {
      unsupported = enumValue.ParseEnumValue(
          tokenString, kAutocompleteUnsupportedContactFieldHintTable, false);
      if (unsupported) {
        return eAutocompleteAttrState_Invalid;
      }
    }

    nsAttrValue contactFieldHint;
    result = contactFieldHint.ParseEnumValue(
        tokenString, kAutocompleteContactFieldHintTable, false);
    if (result) {
      nsAutoString contactFieldHintString;
      contactFieldHint.ToString(contactFieldHintString);
      ASCIIToLower(contactFieldHintString);
      aInfo.mContactType.Assign(contactFieldHintString);
      if (index == 0) {
        return eAutocompleteAttrState_Valid;
      }
      --index;
      tokenString = nsDependentAtomString(aAttrVal->AtomAt(index));
    }
  }

  // Check for billing/shipping tokens
  nsAttrValue fieldHint;
  if (fieldHint.ParseEnumValue(tokenString, kAutocompleteFieldHintTable,
                               false)) {
    nsString fieldHintString;
    fieldHint.ToString(fieldHintString);
    ASCIIToLower(fieldHintString);
    aInfo.mAddressType.Assign(fieldHintString);
    if (index == 0) {
      return eAutocompleteAttrState_Valid;
    }
    --index;
    tokenString = nsDependentAtomString(aAttrVal->AtomAt(index));
  }

  // Check for section-* token
  const nsDependentSubstring& section = Substring(tokenString, 0, 8);
  if (section.LowerCaseEqualsASCII("section-")) {
    ASCIIToLower(tokenString);
    aInfo.mSection.Assign(tokenString);
    if (index == 0) {
      return eAutocompleteAttrState_Valid;
    }
  }

  // Clear the fields as the autocomplete attribute is invalid.
  aInfo.mSection.Truncate();
  aInfo.mAddressType.Truncate();
  aInfo.mContactType.Truncate();
  aInfo.mFieldName.Truncate();
  aInfo.mCredentialType.Truncate();

  return eAutocompleteAttrState_Invalid;
}

// Parse an integer according to HTML spec
template <class CharT>
int32_t nsContentUtils::ParseHTMLIntegerImpl(
    const CharT* aStart, const CharT* aEnd,
    ParseHTMLIntegerResultFlags* aResult) {
  int result = eParseHTMLInteger_NoFlags;

  const CharT* iter = aStart;

  while (iter != aEnd && nsContentUtils::IsHTMLWhitespace(*iter)) {
    result |= eParseHTMLInteger_NonStandard;
    ++iter;
  }

  if (iter == aEnd) {
    result |= eParseHTMLInteger_Error | eParseHTMLInteger_ErrorNoValue;
    *aResult = (ParseHTMLIntegerResultFlags)result;
    return 0;
  }

  int sign = 1;
  if (*iter == CharT('-')) {
    sign = -1;
    result |= eParseHTMLInteger_Negative;
    ++iter;
  } else if (*iter == CharT('+')) {
    result |= eParseHTMLInteger_NonStandard;
    ++iter;
  }

  bool foundValue = false;
  CheckedInt32 value = 0;

  // Check for leading zeros first.
  uint64_t leadingZeros = 0;
  while (iter != aEnd) {
    if (*iter != CharT('0')) {
      break;
    }

    ++leadingZeros;
    foundValue = true;
    ++iter;
  }

  while (iter != aEnd) {
    if (*iter >= CharT('0') && *iter <= CharT('9')) {
      value = (value * 10) + (*iter - CharT('0')) * sign;
      ++iter;
      if (!value.isValid()) {
        result |= eParseHTMLInteger_Error | eParseHTMLInteger_ErrorOverflow;
        break;
      }
      foundValue = true;
    } else {
      break;
    }
  }

  if (!foundValue) {
    result |= eParseHTMLInteger_Error | eParseHTMLInteger_ErrorNoValue;
  }

  if (value.isValid() &&
      ((leadingZeros > 1 || (leadingZeros == 1 && !(value == 0))) ||
       (sign == -1 && value == 0))) {
    result |= eParseHTMLInteger_NonStandard;
  }

  if (iter != aEnd) {
    result |= eParseHTMLInteger_DidNotConsumeAllInput;
  }

  *aResult = (ParseHTMLIntegerResultFlags)result;
  return value.isValid() ? value.value() : 0;
}

// Parse an integer according to HTML spec
int32_t nsContentUtils::ParseHTMLInteger(const char16_t* aStart,
                                         const char16_t* aEnd,
                                         ParseHTMLIntegerResultFlags* aResult) {
  return ParseHTMLIntegerImpl(aStart, aEnd, aResult);
}

int32_t nsContentUtils::ParseHTMLInteger(const char* aStart, const char* aEnd,
                                         ParseHTMLIntegerResultFlags* aResult) {
  return ParseHTMLIntegerImpl(aStart, aEnd, aResult);
}

#define SKIP_WHITESPACE(iter, end_iter, end_res)                 \
  while ((iter) != (end_iter) && nsCRT::IsAsciiSpace(*(iter))) { \
    ++(iter);                                                    \
  }                                                              \
  if ((iter) == (end_iter)) {                                    \
    return (end_res);                                            \
  }

#define SKIP_ATTR_NAME(iter, end_iter)                            \
  while ((iter) != (end_iter) && !nsCRT::IsAsciiSpace(*(iter)) && \
         *(iter) != '=') {                                        \
    ++(iter);                                                     \
  }

bool nsContentUtils::GetPseudoAttributeValue(const nsString& aSource,
                                             nsAtom* aName, nsAString& aValue) {
  aValue.Truncate();

  const char16_t* start = aSource.get();
  const char16_t* end = start + aSource.Length();
  const char16_t* iter;

  while (start != end) {
    SKIP_WHITESPACE(start, end, false)
    iter = start;
    SKIP_ATTR_NAME(iter, end)

    if (start == iter) {
      return false;
    }

    // Remember the attr name.
    const nsDependentSubstring& attrName = Substring(start, iter);

    // Now check whether this is a valid name="value" pair.
    start = iter;
    SKIP_WHITESPACE(start, end, false)
    if (*start != '=') {
      // No '=', so this is not a name="value" pair.  We don't know
      // what it is, and we have no way to handle it.
      return false;
    }

    // Have to skip the value.
    ++start;
    SKIP_WHITESPACE(start, end, false)
    char16_t q = *start;
    if (q != kQuote && q != kApostrophe) {
      // Not a valid quoted value, so bail.
      return false;
    }

    ++start;  // Point to the first char of the value.
    iter = start;

    while (iter != end && *iter != q) {
      ++iter;
    }

    if (iter == end) {
      // Oops, unterminated quoted string.
      return false;
    }

    // At this point attrName holds the name of the "attribute" and
    // the value is between start and iter.

    if (aName->Equals(attrName)) {
      // We'll accumulate as many characters as possible (until we hit either
      // the end of the string or the beginning of an entity). Chunks will be
      // delimited by start and chunkEnd.
      const char16_t* chunkEnd = start;
      while (chunkEnd != iter) {
        if (*chunkEnd == kLessThan) {
          aValue.Truncate();

          return false;
        }

        if (*chunkEnd == kAmpersand) {
          aValue.Append(start, chunkEnd - start);

          const char16_t* afterEntity = nullptr;
          char16_t result[2];
          uint32_t count = MOZ_XMLTranslateEntity(
              reinterpret_cast<const char*>(chunkEnd),
              reinterpret_cast<const char*>(iter),
              reinterpret_cast<const char**>(&afterEntity), result);
          if (count == 0) {
            aValue.Truncate();

            return false;
          }

          aValue.Append(result, count);

          // Advance to after the entity and begin a new chunk.
          start = chunkEnd = afterEntity;
        } else {
          ++chunkEnd;
        }
      }

      // Append remainder.
      aValue.Append(start, iter - start);

      return true;
    }

    // Resume scanning after the end of the attribute value (past the quote
    // char).
    start = iter + 1;
  }

  return false;
}

bool nsContentUtils::IsJavaScriptLanguage(const nsString& aName) {
  // Create MIME type as "text/" + given input
  nsAutoString mimeType(u"text/");
  mimeType.Append(aName);

  return IsJavascriptMIMEType(mimeType);
}

void nsContentUtils::SplitMimeType(const nsAString& aValue, nsString& aType,
                                   nsString& aParams) {
  aType.Truncate();
  aParams.Truncate();
  int32_t semiIndex = aValue.FindChar(char16_t(';'));
  if (-1 != semiIndex) {
    aType = Substring(aValue, 0, semiIndex);
    aParams =
        Substring(aValue, semiIndex + 1, aValue.Length() - (semiIndex + 1));
    aParams.StripWhitespace();
  } else {
    aType = aValue;
  }
  aType.StripWhitespace();
}

/**
* A helper function that parses a sandbox attribute (of an <iframe> or a CSP
* directive) and converts it to the set of flags used internally.
*
* @param aSandboxAttr  the sandbox attribute
* @return              the set of flags (SANDBOXED_NONE if aSandboxAttr is
*                      null)
*/
uint32_t nsContentUtils::ParseSandboxAttributeToFlags(
    const nsAttrValue* aSandboxAttr) {
  if (!aSandboxAttr) {
    return SANDBOXED_NONE;
  }

  uint32_t out = SANDBOX_ALL_FLAGS;

#define SANDBOX_KEYWORD(string, atom, flags)                  \
  if (aSandboxAttr->Contains(nsGkAtoms::atom, eIgnoreCase)) { \
    out &= ~(flags);                                          \
  }
#include "IframeSandboxKeywordList.h"
#undef SANDBOX_KEYWORD

  return out;
}

/**
* A helper function that checks if a string matches a valid sandbox flag.
*
* @param aFlag   the potential sandbox flag.
* @return        true if the flag is a sandbox flag.
*/
bool nsContentUtils::IsValidSandboxFlag(const nsAString& aFlag) {
#define SANDBOX_KEYWORD(string, atom, flags)                                  \
  if (EqualsIgnoreASCIICase(nsDependentAtomString(nsGkAtoms::atom), aFlag)) { \
    return true;                                                              \
  }
#include "IframeSandboxKeywordList.h"
#undef SANDBOX_KEYWORD
  return false;
}

/**
* A helper function that returns a string attribute corresponding to the
* sandbox flags.
*
* @param aFlags    the sandbox flags
* @param aString   the attribute corresponding to the flags (null if aFlags
*                  is zero)
*/
void nsContentUtils::SandboxFlagsToString(uint32_t aFlags, nsAString& aString) {
  if (!aFlags) {
    SetDOMStringToNull(aString);
    return;
  }

  aString.Truncate();

#define SANDBOX_KEYWORD(string, atom, flags)                \
  if (!(aFlags & (flags))) {                                \
    if (!aString.IsEmpty()) {                               \
      aString.AppendLiteral(u" ");                          \
    }                                                       \
    aString.Append(nsDependentAtomString(nsGkAtoms::atom)); \
  }
#include "IframeSandboxKeywordList.h"
#undef SANDBOX_KEYWORD
}

nsIBidiKeyboard* nsContentUtils::GetBidiKeyboard() {
  if (!sBidiKeyboard) {
    sBidiKeyboard = nsIWidget::CreateBidiKeyboard();
  }
  return sBidiKeyboard;
}

/**
* This is used to determine whether a character is in one of the classes
* which CSS says should be part of the first-letter.  Currently, that is
* all punctuation classes (P*).  Note that this is a change from CSS2
* which excluded Pc and Pd.
*
* https://www.w3.org/TR/css-pseudo-4/#first-letter-pseudo
* "Punctuation (i.e, characters that belong to the Punctuation (P*) Unicode
*  general category [UAX44]) [...]"
*/

// static
bool nsContentUtils::IsFirstLetterPunctuation(uint32_t aChar) {
  switch (mozilla::unicode::GetGeneralCategory(aChar)) {
    case HB_UNICODE_GENERAL_CATEGORY_CONNECT_PUNCTUATION: /* Pc */
    case HB_UNICODE_GENERAL_CATEGORY_DASH_PUNCTUATION:    /* Pd */
    case HB_UNICODE_GENERAL_CATEGORY_CLOSE_PUNCTUATION:   /* Pe */
    case HB_UNICODE_GENERAL_CATEGORY_FINAL_PUNCTUATION:   /* Pf */
    case HB_UNICODE_GENERAL_CATEGORY_INITIAL_PUNCTUATION: /* Pi */
    case HB_UNICODE_GENERAL_CATEGORY_OTHER_PUNCTUATION:   /* Po */
    case HB_UNICODE_GENERAL_CATEGORY_OPEN_PUNCTUATION:    /* Ps */
      return true;
    default:
      return false;
  }
}

// static
bool nsContentUtils::IsAlphanumeric(uint32_t aChar) {
  nsUGenCategory cat = mozilla::unicode::GetGenCategory(aChar);

  return (cat == nsUGenCategory::kLetter || cat == nsUGenCategory::kNumber);
}

// static
bool nsContentUtils::IsAlphanumericOrSymbol(uint32_t aChar) {
  nsUGenCategory cat = mozilla::unicode::GetGenCategory(aChar);

  return cat == nsUGenCategory::kLetter || cat == nsUGenCategory::kNumber ||
         cat == nsUGenCategory::kSymbol;
}

// static
bool nsContentUtils::IsHyphen(uint32_t aChar) {
  // Characters treated as hyphens for the purpose of "emergency" breaking
  // when the content would otherwise overflow.
  return aChar == uint32_t('-') ||  // HYPHEN-MINUS
         aChar == 0x2010 ||         // HYPHEN
         aChar == 0x2012 ||         // FIGURE DASH
         aChar == 0x2013 ||         // EN DASH
         aChar == 0x058A;           // ARMENIAN HYPHEN
}

/* static */
bool nsContentUtils::IsHTMLWhitespace(char16_t aChar) {
  return aChar == char16_t(0x0009) || aChar == char16_t(0x000A) ||
         aChar == char16_t(0x000C) || aChar == char16_t(0x000D) ||
         aChar == char16_t(0x0020);
}

/* static */
bool nsContentUtils::IsHTMLWhitespaceOrNBSP(char16_t aChar) {
  return IsHTMLWhitespace(aChar) || aChar == char16_t(0xA0);
}

/* static */
bool nsContentUtils::IsHTMLBlockLevelElement(nsIContent* aContent) {
  return aContent->IsAnyOfHTMLElements(
      nsGkAtoms::address, nsGkAtoms::article, nsGkAtoms::aside,
      nsGkAtoms::blockquote, nsGkAtoms::center, nsGkAtoms::dir, nsGkAtoms::div,
      nsGkAtoms::dl,  // XXX why not dt and dd?
      nsGkAtoms::fieldset,
      nsGkAtoms::figure,  // XXX shouldn't figcaption be on this list
      nsGkAtoms::footer, nsGkAtoms::form, nsGkAtoms::h1, nsGkAtoms::h2,
      nsGkAtoms::h3, nsGkAtoms::h4, nsGkAtoms::h5, nsGkAtoms::h6,
      nsGkAtoms::header, nsGkAtoms::hgroup, nsGkAtoms::hr, nsGkAtoms::li,
      nsGkAtoms::listing, nsGkAtoms::menu, nsGkAtoms::nav, nsGkAtoms::ol,
      nsGkAtoms::p, nsGkAtoms::pre, nsGkAtoms::section, nsGkAtoms::table,
      nsGkAtoms::ul, nsGkAtoms::xmp);
}

// static
int32_t nsContentUtils::ParseLegacyFontSize(const nsAString& aValue) {
  nsAString::const_iterator iter, end;
  aValue.BeginReading(iter);
  aValue.EndReading(end);

  while (iter != end && nsContentUtils::IsHTMLWhitespace(*iter)) {
    ++iter;
  }

  if (iter == end) {
    return 0;
  }

  bool relative = false;
  bool negate = false;
  if (*iter == char16_t('-')) {
    relative = true;
    negate = true;
    ++iter;
  } else if (*iter == char16_t('+')) {
    relative = true;
    ++iter;
  }

  if (iter == end || *iter < char16_t('0') || *iter > char16_t('9')) {
    return 0;
  }

  // We don't have to worry about overflow, since we can bail out as soon as
  // we're bigger than 7.
  int32_t value = 0;
  while (iter != end && *iter >= char16_t('0') && *iter <= char16_t('9')) {
    value = 10 * value + (*iter - char16_t('0'));
    if (value >= 7) {
      break;
    }
    ++iter;
  }

  if (relative) {
    if (negate) {
      value = 3 - value;
    } else {
      value = 3 + value;
    }
  }

  return std::clamp(value, 1, 7);
}

/* static */
void nsContentUtils::GetOfflineAppManifest(Document* aDocument, nsIURI** aURI) {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(aDocument);
  *aURI = nullptr;

  if (aDocument->GetController().isSome()) {
    return;
  }

  Element* docElement = aDocument->GetRootElement();
  if (!docElement) {
    return;
  }

  nsAutoString manifestSpec;
  docElement->GetAttr(nsGkAtoms::manifest, manifestSpec);

  // Manifest URIs can't have fragment identifiers.
  if (manifestSpec.IsEmpty() || manifestSpec.Contains('#')) {
    return;
  }

  nsContentUtils::NewURIWithDocumentCharset(aURI, manifestSpec, aDocument,
                                            aDocument->GetDocBaseURI());
}

/* static */
bool nsContentUtils::OfflineAppAllowed(nsIURI* aURI) { return false; }

/* static */
bool nsContentUtils::OfflineAppAllowed(nsIPrincipal* aPrincipal) {
  return false;
}
// Static
bool nsContentUtils::IsErrorPage(nsIURI* aURI) {
  if (!aURI) {
    return false;
  }

  if (!aURI->SchemeIs("about")) {
    return false;
  }

  nsAutoCString name;
  nsresult rv = NS_GetAboutModuleName(aURI, name);
  NS_ENSURE_SUCCESS(rv, false);

  return name.EqualsLiteral("certerror") || name.EqualsLiteral("neterror") ||
         name.EqualsLiteral("blocked");
}

// static
void nsContentUtils::Shutdown() {
  sInitialized = false;

  nsHTMLTags::ReleaseTable();

  NS_IF_RELEASE(sContentPolicyService);
  sTriedToGetContentPolicy = false;
  for (StaticRefPtr<nsIStringBundle>& bundle : sStringBundles) {
    bundle = nullptr;
  }

  NS_IF_RELEASE(sStringBundleService);
  NS_IF_RELEASE(sConsoleService);
  NS_IF_RELEASE(sXPConnect);
  NS_IF_RELEASE(sSecurityManager);
  NS_IF_RELEASE(sSystemPrincipal);
  NS_IF_RELEASE(sNullSubjectPrincipal);
  NS_IF_RELEASE(sFingerprintingProtectionPrincipal);

  sBidiKeyboard = nullptr;

  delete sAtomEventTable;
  sAtomEventTable = nullptr;
  delete sStringEventTable;
  sStringEventTable = nullptr;
  delete sUserDefinedEvents;
  sUserDefinedEvents = nullptr;

  if (sEventListenerManagersHash) {
    NS_ASSERTION(sEventListenerManagersHash->EntryCount() == 0,
                 "Event listener manager hash not empty at shutdown!");

    // See comment above.

    // However, we have to handle this table differently.  If it still
    // has entries, we want to leak it too, so that we can keep it alive
    // in case any elements are destroyed.  Because if they are, we need
    // their event listener managers to be destroyed too, or otherwise
    // it could leave dangling references in DOMClassInfo's preserved
    // wrapper table.

    if (sEventListenerManagersHash->EntryCount() == 0) {
      delete sEventListenerManagersHash;
      sEventListenerManagersHash = nullptr;
    }
  }

  if (sDOMArenaHashtable) {
    MOZ_ASSERT(sDOMArenaHashtable->Count() == 0);
    MOZ_ASSERT(StaticPrefs::dom_arena_allocator_enabled_AtStartup());
    delete sDOMArenaHashtable;
    sDOMArenaHashtable = nullptr;
  }

  NS_ASSERTION(!sBlockedScriptRunners || sBlockedScriptRunners->Length() == 0,
               "How'd this happen?");
  delete sBlockedScriptRunners;
  sBlockedScriptRunners = nullptr;

  delete sShiftText;
  sShiftText = nullptr;
  delete sControlText;
  sControlText = nullptr;
  delete sCommandOrWinText;
  sCommandOrWinText = nullptr;
  delete sAltText;
  sAltText = nullptr;
  delete sModifierSeparator;
  sModifierSeparator = nullptr;

  delete sJSScriptBytecodeMimeType;
  sJSScriptBytecodeMimeType = nullptr;

  delete sJSModuleBytecodeMimeType;
  sJSModuleBytecodeMimeType = nullptr;

  NS_IF_RELEASE(sSameOriginChecker);

  if (sUserInteractionObserver) {
    sUserInteractionObserver->Shutdown();
    NS_RELEASE(sUserInteractionObserver);
  }

  for (const auto& pref : kRfpPrefs) {
    Preferences::UnregisterCallback(RecomputeResistFingerprintingAllDocs, pref);
  }

  TextControlState::Shutdown();
}

/**
* Checks whether two nodes come from the same origin. aTrustedNode is
* considered 'safe' in that a user can operate on it.
*/
// static
nsresult nsContentUtils::CheckSameOrigin(const nsINode* aTrustedNode,
                                         const nsINode* unTrustedNode) {
  MOZ_ASSERT(aTrustedNode);
  MOZ_ASSERT(unTrustedNode);

  /*
   * Get hold of each node's principal
   */

  nsIPrincipal* trustedPrincipal = aTrustedNode->NodePrincipal();
  nsIPrincipal* unTrustedPrincipal = unTrustedNode->NodePrincipal();

  if (trustedPrincipal == unTrustedPrincipal) {
    return NS_OK;
  }

  bool equal;
  // XXXbz should we actually have a Subsumes() check here instead?  Or perhaps
  // a separate method for that, with callers using one or the other?
  if (NS_FAILED(trustedPrincipal->Equals(unTrustedPrincipal, &equal)) ||
      !equal) {
    return NS_ERROR_DOM_PROP_ACCESS_DENIED;
  }

  return NS_OK;
}

// static
--> --------------------

--> maximum size reached

--> --------------------

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