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gecko-dev/dom/base/StructuredCloneHolder.cpp

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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
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/dom/StructuredCloneHolder.h"
#include <new>
#include "ErrorList.h"
#include "MainThreadUtils.h"
#include "js/CallArgs.h"
#include "js/Value.h"
#include "js/WasmModule.h"
#include "js/Wrapper.h"
#include "jsapi.h"
#include "mozilla/AlreadyAddRefed.h"
#include "mozilla/AutoRestore.h"
#include "mozilla/ErrorResult.h"
#include "mozilla/OwningNonNull.h"
#include "mozilla/RefPtr.h"
#include "mozilla/ScopeExit.h"
#include "mozilla/StaticPrefs_dom.h"
#include "mozilla/dom/BindingDeclarations.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/Blob.h"
#include "mozilla/dom/BlobBinding.h"
#include "mozilla/dom/BlobImpl.h"
#include "mozilla/dom/BrowsingContext.h"
#include "mozilla/dom/ClonedErrorHolder.h"
#include "mozilla/dom/ClonedErrorHolderBinding.h"
#include "mozilla/dom/DirectoryBinding.h"
#include "mozilla/dom/DOMJSClass.h"
#include "mozilla/dom/DOMTypes.h"
#include "mozilla/dom/Directory.h"
#include "mozilla/dom/DocGroup.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/FileList.h"
#include "mozilla/dom/FileListBinding.h"
#include "mozilla/dom/FormData.h"
#include "mozilla/dom/FormDataBinding.h"
#include "mozilla/dom/ImageBitmap.h"
#include "mozilla/dom/ImageBitmapBinding.h"
#include "mozilla/dom/JSExecutionManager.h"
#include "mozilla/dom/MessagePort.h"
#include "mozilla/dom/MessagePortBinding.h"
#include "mozilla/dom/OffscreenCanvas.h"
#include "mozilla/dom/OffscreenCanvasBinding.h"
#include "mozilla/dom/ReadableStream.h"
#include "mozilla/dom/ReadableStreamBinding.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/dom/StructuredCloneBlob.h"
#include "mozilla/dom/StructuredCloneHolderBinding.h"
#include "mozilla/dom/StructuredCloneTags.h"
#include "mozilla/dom/ToJSValue.h"
#include "mozilla/dom/TransformStream.h"
#include "mozilla/dom/TransformStreamBinding.h"
#include "mozilla/dom/VideoFrame.h"
#include "mozilla/dom/VideoFrameBinding.h"
#include "mozilla/dom/WebIDLSerializable.h"
#include "mozilla/dom/WritableStream.h"
#include "mozilla/dom/WritableStreamBinding.h"
#include "mozilla/dom/WorkerCommon.h"
#include "mozilla/dom/WorkerPrivate.h"
#include "mozilla/fallible.h"
#include "mozilla/gfx/2D.h"
#include "nsContentUtils.h"
#include "nsDebug.h"
#include "nsError.h"
#include "nsID.h"
#include "nsIEventTarget.h"
#include "nsIFile.h"
#include "nsIGlobalObject.h"
#include "nsIInputStream.h"
#include "nsIPrincipal.h"
#include "nsISupports.h"
#include "nsJSPrincipals.h"
#include "nsPIDOMWindow.h"
#include "nsString.h"
#include "nsThreadUtils.h"
#include "nsXPCOM.h"
#include "xpcpublic.h"
using namespace mozilla::ipc;
namespace mozilla::dom {
namespace {
JSObject* StructuredCloneCallbacksRead(
JSContext* aCx, JSStructuredCloneReader* aReader,
const JS::CloneDataPolicy& aCloneDataPolicy, uint32_t aTag, uint32_t aIndex,
void* aClosure) {
StructuredCloneHolderBase* holder =
static_cast<StructuredCloneHolderBase*>(aClosure);
MOZ_ASSERT(holder);
return holder->CustomReadHandler(aCx, aReader, aCloneDataPolicy, aTag,
aIndex);
}
bool StructuredCloneCallbacksWrite(JSContext* aCx,
JSStructuredCloneWriter* aWriter,
JS::Handle<JSObject*> aObj,
bool* aSameProcessScopeRequired,
void* aClosure) {
StructuredCloneHolderBase* holder =
static_cast<StructuredCloneHolderBase*>(aClosure);
MOZ_ASSERT(holder);
return holder->CustomWriteHandler(aCx, aWriter, aObj,
aSameProcessScopeRequired);
}
bool StructuredCloneCallbacksReadTransfer(
JSContext* aCx, JSStructuredCloneReader* aReader, uint32_t aTag,
void* aContent, uint64_t aExtraData, void* aClosure,
JS::MutableHandle<JSObject*> aReturnObject) {
StructuredCloneHolderBase* holder =
static_cast<StructuredCloneHolderBase*>(aClosure);
MOZ_ASSERT(holder);
return holder->CustomReadTransferHandler(aCx, aReader, aTag, aContent,
aExtraData, aReturnObject);
}
bool StructuredCloneCallbacksWriteTransfer(
JSContext* aCx, JS::Handle<JSObject*> aObj, void* aClosure,
// Output:
uint32_t* aTag, JS::TransferableOwnership* aOwnership, void** aContent,
uint64_t* aExtraData) {
StructuredCloneHolderBase* holder =
static_cast<StructuredCloneHolderBase*>(aClosure);
MOZ_ASSERT(holder);
return holder->CustomWriteTransferHandler(aCx, aObj, aTag, aOwnership,
aContent, aExtraData);
}
void StructuredCloneCallbacksFreeTransfer(uint32_t aTag,
JS::TransferableOwnership aOwnership,
void* aContent, uint64_t aExtraData,
void* aClosure) {
StructuredCloneHolderBase* holder =
static_cast<StructuredCloneHolderBase*>(aClosure);
MOZ_ASSERT(holder);
return holder->CustomFreeTransferHandler(aTag, aOwnership, aContent,
aExtraData);
}
bool StructuredCloneCallbacksCanTransfer(JSContext* aCx,
JS::Handle<JSObject*> aObject,
bool* aSameProcessScopeRequired,
void* aClosure) {
StructuredCloneHolderBase* holder =
static_cast<StructuredCloneHolderBase*>(aClosure);
MOZ_ASSERT(holder);
return holder->CustomCanTransferHandler(aCx, aObject,
aSameProcessScopeRequired);
}
bool StructuredCloneCallbacksSharedArrayBuffer(JSContext* cx, bool aReceiving,
void* aClosure) {
if (!StaticPrefs::dom_workers_serialized_sab_access()) {
return true;
}
WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
if (workerPrivate) {
workerPrivate->SetExecutionManager(
JSExecutionManager::GetSABSerializationManager());
} else if (NS_IsMainThread()) {
nsIGlobalObject* global = GetCurrentGlobal();
nsPIDOMWindowInner* innerWindow = nullptr;
if (global) {
innerWindow = global->AsInnerWindow();
}
DocGroup* docGroup = nullptr;
if (innerWindow) {
docGroup = innerWindow->GetDocGroup();
}
if (docGroup) {
docGroup->SetExecutionManager(
JSExecutionManager::GetSABSerializationManager());
}
}
return true;
}
void StructuredCloneCallbacksError(JSContext* aCx, uint32_t aErrorId,
void* aClosure, const char* aErrorMessage) {
NS_WARNING("Failed to clone data.");
StructuredCloneHolderBase* holder =
static_cast<StructuredCloneHolderBase*>(aClosure);
MOZ_ASSERT(holder);
return holder->SetErrorMessage(aErrorMessage);
}
void AssertTagValues() {
static_assert(SCTAG_DOM_IMAGEDATA == 0xffff8007 &&
SCTAG_DOM_DOMPOINT == 0xffff8008 &&
SCTAG_DOM_DOMPOINTREADONLY == 0xffff8009 &&
SCTAG_DOM_CRYPTOKEY == 0xffff800a &&
SCTAG_DOM_NULL_PRINCIPAL == 0xffff800b &&
SCTAG_DOM_SYSTEM_PRINCIPAL == 0xffff800c &&
SCTAG_DOM_CONTENT_PRINCIPAL == 0xffff800d &&
SCTAG_DOM_DOMQUAD == 0xffff800e &&
SCTAG_DOM_RTCCERTIFICATE == 0xffff800f &&
SCTAG_DOM_DOMRECT == 0xffff8010 &&
SCTAG_DOM_DOMRECTREADONLY == 0xffff8011 &&
SCTAG_DOM_EXPANDED_PRINCIPAL == 0xffff8012 &&
SCTAG_DOM_DOMMATRIX == 0xffff8013 &&
SCTAG_DOM_URLSEARCHPARAMS == 0xffff8014 &&
SCTAG_DOM_DOMMATRIXREADONLY == 0xffff8015 &&
SCTAG_DOM_STRUCTUREDCLONETESTER == 0xffff8018 &&
SCTAG_DOM_FILESYSTEMHANDLE == 0xffff8019 &&
SCTAG_DOM_FILESYSTEMFILEHANDLE == 0xffff801a &&
SCTAG_DOM_FILESYSTEMDIRECTORYHANDLE == 0xffff801b,
"Something has changed the sctag values. This is wrong!");
}
} // anonymous namespace
const JSStructuredCloneCallbacks StructuredCloneHolder::sCallbacks = {
StructuredCloneCallbacksRead,
StructuredCloneCallbacksWrite,
StructuredCloneCallbacksError,
StructuredCloneCallbacksReadTransfer,
StructuredCloneCallbacksWriteTransfer,
StructuredCloneCallbacksFreeTransfer,
StructuredCloneCallbacksCanTransfer,
StructuredCloneCallbacksSharedArrayBuffer,
};
// StructuredCloneHolderBase class
StructuredCloneHolderBase::StructuredCloneHolderBase(
StructuredCloneScope aScope)
: mStructuredCloneScope(aScope)
#ifdef DEBUG
,
mClearCalled(false)
#endif
{
}
StructuredCloneHolderBase::~StructuredCloneHolderBase() {
#ifdef DEBUG
MOZ_ASSERT(mClearCalled);
#endif
}
void StructuredCloneHolderBase::Clear() {
#ifdef DEBUG
mClearCalled = true;
#endif
mBuffer = nullptr;
}
bool StructuredCloneHolderBase::Write(JSContext* aCx,
JS::Handle<JS::Value> aValue) {
return Write(aCx, aValue, JS::UndefinedHandleValue, JS::CloneDataPolicy());
}
bool StructuredCloneHolderBase::Write(
JSContext* aCx, JS::Handle<JS::Value> aValue,
JS::Handle<JS::Value> aTransfer,
const JS::CloneDataPolicy& aCloneDataPolicy) {
MOZ_ASSERT(!mBuffer, "Double Write is not allowed");
MOZ_ASSERT(!mClearCalled, "This method cannot be called after Clear.");
mBuffer = MakeUnique<JSAutoStructuredCloneBuffer>(
mStructuredCloneScope, &StructuredCloneHolder::sCallbacks, this);
if (!mBuffer->write(aCx, aValue, aTransfer, aCloneDataPolicy,
&StructuredCloneHolder::sCallbacks, this)) {
mBuffer = nullptr;
return false;
}
// Let's update our scope to the final one. The new one could be more
// restrictive of the current one.
MOZ_ASSERT(mStructuredCloneScope >= mBuffer->scope());
mStructuredCloneScope = mBuffer->scope();
return true;
}
bool StructuredCloneHolderBase::Read(JSContext* aCx,
JS::MutableHandle<JS::Value> aValue) {
return Read(aCx, aValue, JS::CloneDataPolicy());
}
bool StructuredCloneHolderBase::Read(
JSContext* aCx, JS::MutableHandle<JS::Value> aValue,
const JS::CloneDataPolicy& aCloneDataPolicy) {
MOZ_ASSERT(mBuffer, "Read() without Write() is not allowed.");
MOZ_ASSERT(!mClearCalled, "This method cannot be called after Clear.");
bool ok = mBuffer->read(aCx, aValue, aCloneDataPolicy,
&StructuredCloneHolder::sCallbacks, this);
return ok;
}
bool StructuredCloneHolderBase::CustomReadTransferHandler(
JSContext* aCx, JSStructuredCloneReader* aReader, uint32_t aTag,
void* aContent, uint64_t aExtraData,
JS::MutableHandle<JSObject*> aReturnObject) {
MOZ_CRASH("Nothing to read.");
return false;
}
bool StructuredCloneHolderBase::CustomWriteTransferHandler(
JSContext* aCx, JS::Handle<JSObject*> aObj, uint32_t* aTag,
JS::TransferableOwnership* aOwnership, void** aContent,
uint64_t* aExtraData) {
// No transfers are supported by default.
return false;
}
void StructuredCloneHolderBase::CustomFreeTransferHandler(
uint32_t aTag, JS::TransferableOwnership aOwnership, void* aContent,
uint64_t aExtraData) {
MOZ_CRASH("Nothing to free.");
}
bool StructuredCloneHolderBase::CustomCanTransferHandler(
JSContext* aCx, JS::Handle<JSObject*> aObj,
bool* aSameProcessScopeRequired) {
return false;
}
// StructuredCloneHolder class
StructuredCloneHolder::StructuredCloneHolder(
CloningSupport aSupportsCloning, TransferringSupport aSupportsTransferring,
StructuredCloneScope aScope)
: StructuredCloneHolderBase(aScope),
mSupportsCloning(aSupportsCloning == CloningSupported),
mSupportsTransferring(aSupportsTransferring == TransferringSupported),
mGlobal(nullptr)
#ifdef DEBUG
,
mCreationEventTarget(GetCurrentSerialEventTarget())
#endif
{
}
StructuredCloneHolder::~StructuredCloneHolder() {
Clear();
MOZ_ASSERT(mTransferredPorts.IsEmpty());
}
void StructuredCloneHolder::Write(JSContext* aCx, JS::Handle<JS::Value> aValue,
ErrorResult& aRv) {
Write(aCx, aValue, JS::UndefinedHandleValue, JS::CloneDataPolicy(), aRv);
}
void StructuredCloneHolder::Write(JSContext* aCx, JS::Handle<JS::Value> aValue,
JS::Handle<JS::Value> aTransfer,
const JS::CloneDataPolicy& aCloneDataPolicy,
ErrorResult& aRv) {
if (!StructuredCloneHolderBase::Write(aCx, aValue, aTransfer,
aCloneDataPolicy)) {
aRv.ThrowDataCloneError(mErrorMessage);
return;
}
}
void StructuredCloneHolder::Read(nsIGlobalObject* aGlobal, JSContext* aCx,
JS::MutableHandle<JS::Value> aValue,
ErrorResult& aRv) {
return Read(aGlobal, aCx, aValue, JS::CloneDataPolicy(), aRv);
}
void StructuredCloneHolder::Read(nsIGlobalObject* aGlobal, JSContext* aCx,
JS::MutableHandle<JS::Value> aValue,
const JS::CloneDataPolicy& aCloneDataPolicy,
ErrorResult& aRv) {
MOZ_ASSERT(aGlobal);
mozilla::AutoRestore<nsIGlobalObject*> guard(mGlobal);
auto errorMessageGuard = MakeScopeExit([&] { mErrorMessage.Truncate(); });
mGlobal = aGlobal;
if (!StructuredCloneHolderBase::Read(aCx, aValue, aCloneDataPolicy)) {
JS_ClearPendingException(aCx);
aRv.ThrowDataCloneError(mErrorMessage);
return;
}
// If we are tranferring something, we cannot call 'Read()' more than once.
if (mSupportsTransferring) {
mBlobImplArray.Clear();
mWasmModuleArray.Clear();
mClonedSurfaces.Clear();
mInputStreamArray.Clear();
mVideoFrames.Clear();
Clear();
}
}
void StructuredCloneHolder::ReadFromBuffer(
nsIGlobalObject* aGlobal, JSContext* aCx, JSStructuredCloneData& aBuffer,
JS::MutableHandle<JS::Value> aValue,
const JS::CloneDataPolicy& aCloneDataPolicy, ErrorResult& aRv) {
ReadFromBuffer(aGlobal, aCx, aBuffer, JS_STRUCTURED_CLONE_VERSION, aValue,
aCloneDataPolicy, aRv);
}
void StructuredCloneHolder::ReadFromBuffer(
nsIGlobalObject* aGlobal, JSContext* aCx, JSStructuredCloneData& aBuffer,
uint32_t aAlgorithmVersion, JS::MutableHandle<JS::Value> aValue,
const JS::CloneDataPolicy& aCloneDataPolicy, ErrorResult& aRv) {
MOZ_ASSERT(!mBuffer, "ReadFromBuffer() must be called without a Write().");
mozilla::AutoRestore<nsIGlobalObject*> guard(mGlobal);
auto errorMessageGuard = MakeScopeExit([&] { mErrorMessage.Truncate(); });
mGlobal = aGlobal;
if (!JS_ReadStructuredClone(aCx, aBuffer, aAlgorithmVersion, CloneScope(),
aValue, aCloneDataPolicy, &sCallbacks, this)) {
JS_ClearPendingException(aCx);
aRv.ThrowDataCloneError(mErrorMessage);
return;
}
}
/* static */
JSObject* StructuredCloneHolder::ReadFullySerializableObjects(
JSContext* aCx, JSStructuredCloneReader* aReader, uint32_t aTag) {
AssertTagValues();
nsIGlobalObject* global = xpc::CurrentNativeGlobal(aCx);
if (!global) {
return nullptr;
}
WebIDLDeserializer deserializer =
LookupDeserializer(StructuredCloneTags(aTag));
if (deserializer) {
return deserializer(aCx, global, aReader);
}
if (aTag == SCTAG_DOM_NULL_PRINCIPAL || aTag == SCTAG_DOM_SYSTEM_PRINCIPAL ||
aTag == SCTAG_DOM_CONTENT_PRINCIPAL ||
aTag == SCTAG_DOM_EXPANDED_PRINCIPAL) {
JSPrincipals* prin;
if (!nsJSPrincipals::ReadKnownPrincipalType(aCx, aReader, aTag, &prin)) {
return nullptr;
}
JS::Rooted<JS::Value> result(aCx);
{
// nsJSPrincipals::ReadKnownPrincipalType addrefs for us, but because of
// the casting between JSPrincipals* and nsIPrincipal* we can't use
// getter_AddRefs above and have to already_AddRefed here.
nsCOMPtr<nsIPrincipal> principal =
already_AddRefed<nsIPrincipal>(nsJSPrincipals::get(prin));
nsresult rv = nsContentUtils::WrapNative(
aCx, principal, &NS_GET_IID(nsIPrincipal), &result);
if (NS_FAILED(rv)) {
xpc::Throw(aCx, NS_ERROR_DOM_DATA_CLONE_ERR);
return nullptr;
}
}
return result.toObjectOrNull();
}
// Don't know what this is. Bail.
xpc::Throw(aCx, NS_ERROR_DOM_DATA_CLONE_ERR);
return nullptr;
}
/* static */
bool StructuredCloneHolder::WriteFullySerializableObjects(
JSContext* aCx, JSStructuredCloneWriter* aWriter,
JS::Handle<JSObject*> aObj) {
AssertTagValues();
// Window and Location are not serializable, so it's OK to just do a static
// unwrap here.
JS::Rooted<JSObject*> obj(aCx, js::CheckedUnwrapStatic(aObj));
if (!obj) {
return xpc::Throw(aCx, NS_ERROR_DOM_DATA_CLONE_ERR);
}
const DOMJSClass* domClass = GetDOMClass(obj);
if (domClass && domClass->mSerializer) {
return domClass->mSerializer(aCx, aWriter, obj);
}
if (NS_IsMainThread() && xpc::IsReflector(obj, aCx)) {
// We only care about principals, so ReflectorToISupportsStatic is fine.
nsCOMPtr<nsISupports> base = xpc::ReflectorToISupportsStatic(obj);
nsCOMPtr<nsIPrincipal> principal = do_QueryInterface(base);
if (principal) {
auto nsjsprincipals = nsJSPrincipals::get(principal);
return nsjsprincipals->write(aCx, aWriter);
}
}
// Don't know what this is
ErrorResult rv;
const char* className = JS::GetClass(obj)->name;
rv.ThrowDataCloneError(nsDependentCString(className) +
" object could not be cloned."_ns);
MOZ_ALWAYS_TRUE(rv.MaybeSetPendingException(aCx));
return false;
}
/* static */
bool StructuredCloneHolder::ReadString(JSStructuredCloneReader* aReader,
nsString& aString) {
uint32_t length, zero;
if (!JS_ReadUint32Pair(aReader, &length, &zero)) {
return false;
}
if (NS_WARN_IF(!aString.SetLength(length, fallible))) {
return false;
}
size_t charSize = sizeof(nsString::char_type);
return JS_ReadBytes(aReader, (void*)aString.BeginWriting(),
length * charSize);
}
/* static */
bool StructuredCloneHolder::WriteString(JSStructuredCloneWriter* aWriter,
const nsAString& aString) {
size_t charSize = sizeof(nsString::char_type);
return JS_WriteUint32Pair(aWriter, aString.Length(), 0) &&
JS_WriteBytes(aWriter, aString.BeginReading(),
aString.Length() * charSize);
}
namespace {
JSObject* ReadBlob(JSContext* aCx, uint32_t aIndex,
StructuredCloneHolder* aHolder) {
MOZ_ASSERT(aHolder);
#ifdef FUZZING
if (aIndex >= aHolder->BlobImpls().Length()) {
return nullptr;
}
#endif
MOZ_ASSERT(aIndex < aHolder->BlobImpls().Length());
JS::Rooted<JS::Value> val(aCx);
{
// RefPtr<File> and RefPtr<BlobImpl> need to go out of scope before
// toObject() is called because the static analysis thinks releasing XPCOM
// objects can GC (because in some cases it can!), and a return statement
// with a JSObject* type means that JSObject* is on the stack as a raw
// pointer while destructors are running.
RefPtr<BlobImpl> blobImpl = aHolder->BlobImpls()[aIndex];
RefPtr<Blob> blob = Blob::Create(aHolder->GlobalDuringRead(), blobImpl);
if (NS_WARN_IF(!blob)) {
return nullptr;
}
if (!ToJSValue(aCx, blob, &val)) {
return nullptr;
}
}
return &val.toObject();
}
bool WriteBlob(JSStructuredCloneWriter* aWriter, Blob* aBlob,
StructuredCloneHolder* aHolder) {
MOZ_ASSERT(aWriter);
MOZ_ASSERT(aBlob);
MOZ_ASSERT(aHolder);
RefPtr<BlobImpl> blobImpl = aBlob->Impl();
// We store the position of the blobImpl in the array as index.
if (JS_WriteUint32Pair(aWriter, SCTAG_DOM_BLOB,
aHolder->BlobImpls().Length())) {
aHolder->BlobImpls().AppendElement(blobImpl);
return true;
}
return false;
}
// A directory is serialized as:
// - pair of ints: SCTAG_DOM_DIRECTORY, path length
// - path as string
bool WriteDirectory(JSStructuredCloneWriter* aWriter, Directory* aDirectory) {
MOZ_ASSERT(aWriter);
MOZ_ASSERT(aDirectory);
nsAutoString path;
aDirectory->GetFullRealPath(path);
size_t charSize = sizeof(nsString::char_type);
return JS_WriteUint32Pair(aWriter, SCTAG_DOM_DIRECTORY, path.Length()) &&
JS_WriteBytes(aWriter, path.get(), path.Length() * charSize);
}
already_AddRefed<Directory> ReadDirectoryInternal(
JSStructuredCloneReader* aReader, uint32_t aPathLength,
StructuredCloneHolder* aHolder) {
MOZ_ASSERT(aReader);
MOZ_ASSERT(aHolder);
nsAutoString path;
if (NS_WARN_IF(!path.SetLength(aPathLength, fallible))) {
return nullptr;
}
size_t charSize = sizeof(nsString::char_type);
if (!JS_ReadBytes(aReader, (void*)path.BeginWriting(),
aPathLength * charSize)) {
return nullptr;
}
nsCOMPtr<nsIFile> file;
nsresult rv = NS_NewLocalFile(path, true, getter_AddRefs(file));
if (NS_WARN_IF(NS_FAILED(rv))) {
return nullptr;
}
RefPtr<Directory> directory =
Directory::Create(aHolder->GlobalDuringRead(), file);
return directory.forget();
}
JSObject* ReadDirectory(JSContext* aCx, JSStructuredCloneReader* aReader,
uint32_t aPathLength, StructuredCloneHolder* aHolder) {
MOZ_ASSERT(aCx);
MOZ_ASSERT(aReader);
MOZ_ASSERT(aHolder);
// RefPtr<Directory> needs to go out of scope before toObject() is
// called because the static analysis thinks dereferencing XPCOM objects
// can GC (because in some cases it can!), and a return statement with a
// JSObject* type means that JSObject* is on the stack as a raw pointer
// while destructors are running.
JS::Rooted<JS::Value> val(aCx);
{
RefPtr<Directory> directory =
ReadDirectoryInternal(aReader, aPathLength, aHolder);
if (!directory) {
return nullptr;
}
if (!ToJSValue(aCx, directory, &val)) {
return nullptr;
}
}
return &val.toObject();
}
// Read the WriteFileList for the format.
JSObject* ReadFileList(JSContext* aCx, JSStructuredCloneReader* aReader,
uint32_t aCount, StructuredCloneHolder* aHolder) {
MOZ_ASSERT(aCx);
MOZ_ASSERT(aReader);
JS::Rooted<JS::Value> val(aCx);
{
RefPtr<FileList> fileList = new FileList(aHolder->GlobalDuringRead());
uint32_t zero, index;
// |index| is the index of the first blobImpl.
if (!JS_ReadUint32Pair(aReader, &zero, &index) || zero != 0) {
return nullptr;
}
// |aCount| is the number of BlobImpls to use from the |index|.
for (uint32_t i = 0; i < aCount; ++i) {
uint32_t pos = index + i;
#ifdef FUZZING
if (pos >= aHolder->BlobImpls().Length()) {
return nullptr;
}
#endif
MOZ_ASSERT(pos < aHolder->BlobImpls().Length());
RefPtr<BlobImpl> blobImpl = aHolder->BlobImpls()[pos];
MOZ_ASSERT(blobImpl->IsFile());
RefPtr<File> file = File::Create(aHolder->GlobalDuringRead(), blobImpl);
if (NS_WARN_IF(!file)) {
return nullptr;
}
if (!fileList->Append(file)) {
return nullptr;
}
}
if (!ToJSValue(aCx, fileList, &val)) {
return nullptr;
}
}
return &val.toObject();
}
// The format of the FileList serialization is:
// - pair of ints: SCTAG_DOM_FILELIST, Length of the FileList
// - pair of ints: 0, The offset of the BlobImpl array
bool WriteFileList(JSStructuredCloneWriter* aWriter, FileList* aFileList,
StructuredCloneHolder* aHolder) {
MOZ_ASSERT(aWriter);
MOZ_ASSERT(aFileList);
MOZ_ASSERT(aHolder);
// A FileList is serialized writing the X number of elements and the offset
// from mBlobImplArray. The Read will take X elements from mBlobImplArray
// starting from the offset.
if (!JS_WriteUint32Pair(aWriter, SCTAG_DOM_FILELIST, aFileList->Length()) ||
!JS_WriteUint32Pair(aWriter, 0, aHolder->BlobImpls().Length())) {
return false;
}
nsTArray<RefPtr<BlobImpl>> blobImpls;
for (uint32_t i = 0; i < aFileList->Length(); ++i) {
RefPtr<BlobImpl> blobImpl = aFileList->Item(i)->Impl();
blobImpls.AppendElement(blobImpl);
}
aHolder->BlobImpls().AppendElements(blobImpls);
return true;
}
// Read the WriteFormData for the format.
JSObject* ReadFormData(JSContext* aCx, JSStructuredCloneReader* aReader,
uint32_t aCount, StructuredCloneHolder* aHolder) {
MOZ_ASSERT(aCx);
MOZ_ASSERT(aReader);
MOZ_ASSERT(aHolder);
// See the serialization of the FormData for the format.
JS::Rooted<JS::Value> val(aCx);
{
RefPtr<FormData> formData = new FormData(aHolder->GlobalDuringRead());
Optional<nsAString> thirdArg;
for (uint32_t i = 0; i < aCount; ++i) {
nsAutoString name;
if (!StructuredCloneHolder::ReadString(aReader, name)) {
return nullptr;
}
uint32_t tag, indexOrLengthOfString;
if (!JS_ReadUint32Pair(aReader, &tag, &indexOrLengthOfString)) {
return nullptr;
}
if (tag == SCTAG_DOM_BLOB) {
#ifdef FUZZING
if (indexOrLengthOfString >= aHolder->BlobImpls().Length()) {
return nullptr;
}
#endif
MOZ_ASSERT(indexOrLengthOfString < aHolder->BlobImpls().Length());
RefPtr<BlobImpl> blobImpl = aHolder->BlobImpls()[indexOrLengthOfString];
RefPtr<Blob> blob = Blob::Create(aHolder->GlobalDuringRead(), blobImpl);
if (NS_WARN_IF(!blob)) {
return nullptr;
}
ErrorResult rv;
formData->Append(name, *blob, thirdArg, rv);
if (NS_WARN_IF(rv.Failed())) {
rv.SuppressException();
return nullptr;
}
} else if (tag == SCTAG_DOM_DIRECTORY) {
RefPtr<Directory> directory =
ReadDirectoryInternal(aReader, indexOrLengthOfString, aHolder);
if (!directory) {
return nullptr;
}
formData->Append(name, directory);
} else {
if (NS_WARN_IF(tag != 0)) {
return nullptr;
}
nsAutoString value;
if (NS_WARN_IF(!value.SetLength(indexOrLengthOfString, fallible))) {
return nullptr;
}
size_t charSize = sizeof(nsString::char_type);
if (!JS_ReadBytes(aReader, (void*)value.BeginWriting(),
indexOrLengthOfString * charSize)) {
return nullptr;
}
ErrorResult rv;
formData->Append(name, value, rv);
if (NS_WARN_IF(rv.Failed())) {
rv.SuppressException();
return nullptr;
}
}
}
if (!ToJSValue(aCx, formData, &val)) {
return nullptr;
}
}
return &val.toObject();
}
// The format of the FormData serialization is:
// - pair of ints: SCTAG_DOM_FORMDATA, Length of the FormData elements
// - for each Element element:
// - name string
// - if it's a blob:
// - pair of ints: SCTAG_DOM_BLOB, index of the BlobImpl in the array
// mBlobImplArray.
// - if it's a directory (See WriteDirectory):
// - pair of ints: SCTAG_DOM_DIRECTORY, path length
// - path as string
// - else:
// - pair of ints: 0, string length
// - value string
bool WriteFormData(JSStructuredCloneWriter* aWriter, FormData* aFormData,
StructuredCloneHolder* aHolder) {
MOZ_ASSERT(aWriter);
MOZ_ASSERT(aFormData);
MOZ_ASSERT(aHolder);
if (!JS_WriteUint32Pair(aWriter, SCTAG_DOM_FORMDATA, aFormData->Length())) {
return false;
}
class MOZ_STACK_CLASS Closure final {
JSStructuredCloneWriter* mWriter;
StructuredCloneHolder* mHolder;
public:
Closure(JSStructuredCloneWriter* aWriter, StructuredCloneHolder* aHolder)
: mWriter(aWriter), mHolder(aHolder) {}
static bool Write(const nsString& aName,
const OwningBlobOrDirectoryOrUSVString& aValue,
void* aClosure) {
Closure* closure = static_cast<Closure*>(aClosure);
if (!StructuredCloneHolder::WriteString(closure->mWriter, aName)) {
return false;
}
if (aValue.IsBlob()) {
if (!JS_WriteUint32Pair(closure->mWriter, SCTAG_DOM_BLOB,
closure->mHolder->BlobImpls().Length())) {
return false;
}
RefPtr<BlobImpl> blobImpl = aValue.GetAsBlob()->Impl();
closure->mHolder->BlobImpls().AppendElement(blobImpl);
return true;
}
if (aValue.IsDirectory()) {
Directory* directory = aValue.GetAsDirectory();
return WriteDirectory(closure->mWriter, directory);
}
size_t charSize = sizeof(nsString::char_type);
if (!JS_WriteUint32Pair(closure->mWriter, 0,
aValue.GetAsUSVString().Length()) ||
!JS_WriteBytes(closure->mWriter, aValue.GetAsUSVString().get(),
aValue.GetAsUSVString().Length() * charSize)) {
return false;
}
return true;
}
};
Closure closure(aWriter, aHolder);
return aFormData->ForEach(Closure::Write, &closure);
}
JSObject* ReadWasmModule(JSContext* aCx, uint32_t aIndex,
StructuredCloneHolder* aHolder) {
MOZ_ASSERT(aHolder);
MOZ_ASSERT(aHolder->CloneScope() ==
StructuredCloneHolder::StructuredCloneScope::SameProcess);
#ifdef FUZZING
if (aIndex >= aHolder->WasmModules().Length()) {
return nullptr;
}
#endif
MOZ_ASSERT(aIndex < aHolder->WasmModules().Length());
return aHolder->WasmModules()[aIndex]->createObject(aCx);
}
bool WriteWasmModule(JSStructuredCloneWriter* aWriter,
JS::WasmModule* aWasmModule,
StructuredCloneHolder* aHolder) {
MOZ_ASSERT(aWriter);
MOZ_ASSERT(aWasmModule);
MOZ_ASSERT(aHolder);
MOZ_ASSERT(aHolder->CloneScope() ==
StructuredCloneHolder::StructuredCloneScope::SameProcess);
// We store the position of the wasmModule in the array as index.
if (JS_WriteUint32Pair(aWriter, SCTAG_DOM_WASM_MODULE,
aHolder->WasmModules().Length())) {
aHolder->WasmModules().AppendElement(aWasmModule);
return true;
}
return false;
}
JSObject* ReadInputStream(JSContext* aCx, uint32_t aIndex,
StructuredCloneHolder* aHolder) {
MOZ_ASSERT(aHolder);
#ifdef FUZZING
if (aIndex >= aHolder->InputStreams().Length()) {
return nullptr;
}
#endif
MOZ_ASSERT(aIndex < aHolder->InputStreams().Length());
JS::Rooted<JS::Value> result(aCx);
{
nsCOMPtr<nsIInputStream> inputStream = aHolder->InputStreams()[aIndex];
nsresult rv = nsContentUtils::WrapNative(
aCx, inputStream, &NS_GET_IID(nsIInputStream), &result);
if (NS_FAILED(rv)) {
return nullptr;
}
}
return &result.toObject();
}
bool WriteInputStream(JSStructuredCloneWriter* aWriter,
nsIInputStream* aInputStream,
StructuredCloneHolder* aHolder) {
MOZ_ASSERT(aWriter);
MOZ_ASSERT(aInputStream);
MOZ_ASSERT(aHolder);
// We store the position of the inputStream in the array as index.
if (JS_WriteUint32Pair(aWriter, SCTAG_DOM_INPUTSTREAM,
aHolder->InputStreams().Length())) {
aHolder->InputStreams().AppendElement(aInputStream);
return true;
}
return false;
}
} // anonymous namespace
JSObject* StructuredCloneHolder::CustomReadHandler(
JSContext* aCx, JSStructuredCloneReader* aReader,
const JS::CloneDataPolicy& aCloneDataPolicy, uint32_t aTag,
uint32_t aIndex) {
MOZ_ASSERT(mSupportsCloning);
if (aTag == SCTAG_DOM_BLOB) {
return ReadBlob(aCx, aIndex, this);
}
if (aTag == SCTAG_DOM_DIRECTORY) {
return ReadDirectory(aCx, aReader, aIndex, this);
}
if (aTag == SCTAG_DOM_FILELIST) {
return ReadFileList(aCx, aReader, aIndex, this);
}
if (aTag == SCTAG_DOM_FORMDATA) {
return ReadFormData(aCx, aReader, aIndex, this);
}
if (aTag == SCTAG_DOM_IMAGEBITMAP &&
CloneScope() == StructuredCloneScope::SameProcess) {
// Get the current global object.
// This can be null.
JS::Rooted<JSObject*> result(aCx);
{
// aIndex is the index of the cloned image.
result = ImageBitmap::ReadStructuredClone(aCx, aReader, mGlobal,
GetSurfaces(), aIndex);
}
return result;
}
if (aTag == SCTAG_DOM_STRUCTURED_CLONE_HOLDER) {
return StructuredCloneBlob::ReadStructuredClone(aCx, aReader, this);
}
if (aTag == SCTAG_DOM_WASM_MODULE &&
CloneScope() == StructuredCloneScope::SameProcess &&
aCloneDataPolicy.areIntraClusterClonableSharedObjectsAllowed()) {
return ReadWasmModule(aCx, aIndex, this);
}
if (aTag == SCTAG_DOM_INPUTSTREAM) {
return ReadInputStream(aCx, aIndex, this);
}
if (aTag == SCTAG_DOM_BROWSING_CONTEXT) {
return BrowsingContext::ReadStructuredClone(aCx, aReader, this);
}
if (aTag == SCTAG_DOM_CLONED_ERROR_OBJECT) {
return ClonedErrorHolder::ReadStructuredClone(aCx, aReader, this);
}
if (StaticPrefs::dom_media_webcodecs_enabled() &&
aTag == SCTAG_DOM_VIDEOFRAME &&
CloneScope() == StructuredCloneScope::SameProcess) {
return VideoFrame::ReadStructuredClone(aCx, mGlobal, aReader,
VideoFrames()[aIndex]);
}
return ReadFullySerializableObjects(aCx, aReader, aTag);
}
bool StructuredCloneHolder::CustomWriteHandler(
JSContext* aCx, JSStructuredCloneWriter* aWriter,
JS::Handle<JSObject*> aObj, bool* aSameProcessScopeRequired) {
if (!mSupportsCloning) {
return false;
}
JS::Rooted<JSObject*> obj(aCx, aObj);
// See if this is a File/Blob object.
{
Blob* blob = nullptr;
if (NS_SUCCEEDED(UNWRAP_OBJECT(Blob, &obj, blob))) {
return WriteBlob(aWriter, blob, this);
}
}
// See if this is a Directory object.
{
Directory* directory = nullptr;
if (NS_SUCCEEDED(UNWRAP_OBJECT(Directory, &obj, directory))) {
return WriteDirectory(aWriter, directory);
}
}
// See if this is a FileList object.
{
FileList* fileList = nullptr;
if (NS_SUCCEEDED(UNWRAP_OBJECT(FileList, &obj, fileList))) {
return WriteFileList(aWriter, fileList, this);
}
}
// See if this is a FormData object.
{
FormData* formData = nullptr;
if (NS_SUCCEEDED(UNWRAP_OBJECT(FormData, &obj, formData))) {
return WriteFormData(aWriter, formData, this);
}
}
// See if this is an ImageBitmap object.
{
ImageBitmap* imageBitmap = nullptr;
if (NS_SUCCEEDED(UNWRAP_OBJECT(ImageBitmap, &obj, imageBitmap))) {
SameProcessScopeRequired(aSameProcessScopeRequired);
if (CloneScope() == StructuredCloneScope::SameProcess) {
ErrorResult rv;
ImageBitmap::WriteStructuredClone(aWriter, GetSurfaces(), imageBitmap,
rv);
return !rv.MaybeSetPendingException(aCx);
}
return false;
}
}
// See if this is a StructuredCloneBlob object.
{
StructuredCloneBlob* holder = nullptr;
if (NS_SUCCEEDED(UNWRAP_OBJECT(StructuredCloneHolder, &obj, holder))) {
return holder->WriteStructuredClone(aCx, aWriter, this);
}
}
// See if this is a BrowsingContext object.
{
BrowsingContext* holder = nullptr;
if (NS_SUCCEEDED(UNWRAP_OBJECT(BrowsingContext, &obj, holder))) {
return holder->WriteStructuredClone(aCx, aWriter, this);
}
}
// See if this is a ClonedErrorHolder object.
{
ClonedErrorHolder* holder = nullptr;
if (NS_SUCCEEDED(UNWRAP_OBJECT(ClonedErrorHolder, &obj, holder))) {
return holder->WriteStructuredClone(aCx, aWriter, this);
}
}
// See if this is a WasmModule.
if (JS::IsWasmModuleObject(obj)) {
SameProcessScopeRequired(aSameProcessScopeRequired);
if (CloneScope() == StructuredCloneScope::SameProcess) {
RefPtr<JS::WasmModule> module = JS::GetWasmModule(obj);
MOZ_ASSERT(module);
return WriteWasmModule(aWriter, module, this);
}
return false;
}
// See if this is a VideoFrame object.
if (StaticPrefs::dom_media_webcodecs_enabled()) {
VideoFrame* videoFrame = nullptr;
if (NS_SUCCEEDED(UNWRAP_OBJECT(VideoFrame, &obj, videoFrame))) {
SameProcessScopeRequired(aSameProcessScopeRequired);
return CloneScope() == StructuredCloneScope::SameProcess
? videoFrame->WriteStructuredClone(aWriter, this)
: false;
}
}
{
// We only care about streams, so ReflectorToISupportsStatic is fine.
nsCOMPtr<nsISupports> base = xpc::ReflectorToISupportsStatic(aObj);
nsCOMPtr<nsIInputStream> inputStream = do_QueryInterface(base);
if (inputStream) {
return WriteInputStream(aWriter, inputStream, this);
}
}
return WriteFullySerializableObjects(aCx, aWriter, aObj);
}
already_AddRefed<MessagePort> StructuredCloneHolder::ReceiveMessagePort(
uint64_t aIndex) {
if (NS_WARN_IF(aIndex >= mPortIdentifiers.Length())) {
return nullptr;
}
UniqueMessagePortId portId(mPortIdentifiers[aIndex]);
ErrorResult rv;
RefPtr<MessagePort> port = MessagePort::Create(mGlobal, portId, rv);
if (NS_WARN_IF(rv.Failed())) {
rv.SuppressException();
return nullptr;
}
return port.forget();
}
// TODO: Convert this to MOZ_CAN_RUN_SCRIPT (bug 1415230)
MOZ_CAN_RUN_SCRIPT_BOUNDARY bool
StructuredCloneHolder::CustomReadTransferHandler(
JSContext* aCx, JSStructuredCloneReader* aReader, uint32_t aTag,
void* aContent, uint64_t aExtraData,
JS::MutableHandle<JSObject*> aReturnObject) {
MOZ_ASSERT(mSupportsTransferring);
if (aTag == SCTAG_DOM_MAP_MESSAGEPORT) {
#ifdef FUZZING
if (aExtraData >= mPortIdentifiers.Length()) {
return false;
}
#endif
RefPtr<MessagePort> port = ReceiveMessagePort(aExtraData);
if (!port) {
return false;
}
mTransferredPorts.AppendElement(port);
JS::Rooted<JS::Value> value(aCx);
if (!GetOrCreateDOMReflector(aCx, port, &value)) {
JS_ClearPendingException(aCx);
return false;
}
aReturnObject.set(&value.toObject());
return true;
}
if (aTag == SCTAG_DOM_CANVAS &&
CloneScope() == StructuredCloneScope::SameProcess) {
MOZ_ASSERT(aContent);
OffscreenCanvasCloneData* data =
static_cast<OffscreenCanvasCloneData*>(aContent);
RefPtr<OffscreenCanvas> canvas =
OffscreenCanvas::CreateFromCloneData(mGlobal, data);
delete data;
JS::Rooted<JS::Value> value(aCx);
if (!GetOrCreateDOMReflector(aCx, canvas, &value)) {
JS_ClearPendingException(aCx);
return false;
}
aReturnObject.set(&value.toObject());
return true;
}
if (aTag == SCTAG_DOM_IMAGEBITMAP &&
CloneScope() == StructuredCloneScope::SameProcess) {
MOZ_ASSERT(aContent);
ImageBitmapCloneData* data = static_cast<ImageBitmapCloneData*>(aContent);
RefPtr<ImageBitmap> bitmap =
ImageBitmap::CreateFromCloneData(mGlobal, data);
delete data;
JS::Rooted<JS::Value> value(aCx);
if (!GetOrCreateDOMReflector(aCx, bitmap, &value)) {
JS_ClearPendingException(aCx);
return false;
}
aReturnObject.set(&value.toObject());
return true;
}
if (aTag == SCTAG_DOM_READABLESTREAM) {
#ifdef FUZZING
if (aExtraData >= mPortIdentifiers.Length()) {
return false;
}
#endif
RefPtr<MessagePort> port = ReceiveMessagePort(aExtraData);
if (!port) {
return false;
}
nsCOMPtr<nsIGlobalObject> global = mGlobal;
return ReadableStream::ReceiveTransfer(aCx, global, *port, aReturnObject);
}
if (aTag == SCTAG_DOM_WRITABLESTREAM) {
#ifdef FUZZING
if (aExtraData >= mPortIdentifiers.Length()) {
return false;
}
#endif
RefPtr<MessagePort> port = ReceiveMessagePort(aExtraData);
if (!port) {
return false;
}
nsCOMPtr<nsIGlobalObject> global = mGlobal;
return WritableStream::ReceiveTransfer(aCx, global, *port, aReturnObject);
}
if (aTag == SCTAG_DOM_TRANSFORMSTREAM) {
#ifdef FUZZING
if (aExtraData + 1 >= mPortIdentifiers.Length()) {
return false;
}
#endif
RefPtr<MessagePort> port1 = ReceiveMessagePort(aExtraData);
RefPtr<MessagePort> port2 = ReceiveMessagePort(aExtraData + 1);
if (!port1 || !port2) {
return false;
}
nsCOMPtr<nsIGlobalObject> global = mGlobal;
return TransformStream::ReceiveTransfer(aCx, global, *port1, *port2,
aReturnObject);
}
if (StaticPrefs::dom_media_webcodecs_enabled() &&
aTag == SCTAG_DOM_VIDEOFRAME &&
CloneScope() == StructuredCloneScope::SameProcess) {
MOZ_ASSERT(aContent);
VideoFrame::TransferredData* data =
static_cast<VideoFrame::TransferredData*>(aContent);
nsCOMPtr<nsIGlobalObject> global = mGlobal;
RefPtr<VideoFrame> frame = VideoFrame::FromTransferred(global.get(), data);
// aContent will be released in CustomFreeTransferHandler if frame is null.
if (!frame) {
return false;
}
delete data;
aContent = nullptr;
JS::Rooted<JS::Value> value(aCx);
if (!GetOrCreateDOMReflector(aCx, frame, &value)) {
JS_ClearPendingException(aCx);
return false;
}
aReturnObject.set(&value.toObject());
return true;
}
return false;
}
// TODO: Convert this to MOZ_CAN_RUN_SCRIPT (bug 1415230)
MOZ_CAN_RUN_SCRIPT_BOUNDARY bool
StructuredCloneHolder::CustomWriteTransferHandler(
JSContext* aCx, JS::Handle<JSObject*> aObj, uint32_t* aTag,
JS::TransferableOwnership* aOwnership, void** aContent,
uint64_t* aExtraData) {
if (!mSupportsTransferring) {
return false;
}
JS::Rooted<JSObject*> obj(aCx, aObj);
{
MessagePort* port = nullptr;
nsresult rv = UNWRAP_OBJECT(MessagePort, &obj, port);
if (NS_SUCCEEDED(rv)) {
if (!port->CanBeCloned()) {
return false;
}
UniqueMessagePortId identifier;
port->CloneAndDisentangle(identifier);
// We use aExtraData to store the index of this new port identifier.
*aExtraData = mPortIdentifiers.Length();
mPortIdentifiers.AppendElement(identifier.release());
*aTag = SCTAG_DOM_MAP_MESSAGEPORT;
*aOwnership = JS::SCTAG_TMO_CUSTOM;
*aContent = nullptr;
return true;
}
if (CloneScope() == StructuredCloneScope::SameProcess) {
OffscreenCanvas* canvas = nullptr;
rv = UNWRAP_OBJECT(OffscreenCanvas, &obj, canvas);
if (NS_SUCCEEDED(rv)) {
MOZ_ASSERT(canvas);
if (!canvas->MayNeuter()) {
return false;
}
*aExtraData = 0;
*aTag = SCTAG_DOM_CANVAS;
*aOwnership = JS::SCTAG_TMO_CUSTOM;
*aContent = canvas->ToCloneData();
MOZ_ASSERT(*aContent);
canvas->SetNeutered();
return true;
}
ImageBitmap* bitmap = nullptr;
rv = UNWRAP_OBJECT(ImageBitmap, &obj, bitmap);
if (NS_SUCCEEDED(rv)) {
MOZ_ASSERT(bitmap);
MOZ_ASSERT(!bitmap->IsWriteOnly());
*aExtraData = 0;
*aTag = SCTAG_DOM_IMAGEBITMAP;
*aOwnership = JS::SCTAG_TMO_CUSTOM;
UniquePtr<ImageBitmapCloneData> clonedBitmap = bitmap->ToCloneData();
if (!clonedBitmap) {
return false;
}
*aContent = clonedBitmap.release();
MOZ_ASSERT(*aContent);
bitmap->Close();
return true;
}
if (StaticPrefs::dom_media_webcodecs_enabled()) {
VideoFrame* videoFrame = nullptr;
rv = UNWRAP_OBJECT(VideoFrame, &obj, videoFrame);
if (NS_SUCCEEDED(rv)) {
MOZ_ASSERT(videoFrame);
*aExtraData = 0;
*aTag = SCTAG_DOM_VIDEOFRAME;
*aOwnership = JS::SCTAG_TMO_CUSTOM;
*aContent = nullptr;
UniquePtr<VideoFrame::TransferredData> data = videoFrame->Transfer();
if (!data) {
return false;
}
*aContent = data.release();
MOZ_ASSERT(*aContent);
return true;
}
}
}
{
RefPtr<ReadableStream> stream;
rv = UNWRAP_OBJECT(ReadableStream, &obj, stream);
if (NS_SUCCEEDED(rv)) {
MOZ_ASSERT(stream);
*aTag = SCTAG_DOM_READABLESTREAM;
*aOwnership = JS::SCTAG_TMO_CUSTOM;
*aContent = nullptr;
UniqueMessagePortId id;
if (!stream->Transfer(aCx, id)) {
return false;
}
*aExtraData = mPortIdentifiers.Length();
mPortIdentifiers.AppendElement(id.release());
return true;
}
}
{
RefPtr<WritableStream> stream;
rv = UNWRAP_OBJECT(WritableStream, &obj, stream);
if (NS_SUCCEEDED(rv)) {
MOZ_ASSERT(stream);
*aTag = SCTAG_DOM_WRITABLESTREAM;
*aOwnership = JS::SCTAG_TMO_CUSTOM;
*aContent = nullptr;
UniqueMessagePortId id;
if (!stream->Transfer(aCx, id)) {
return false;
}
*aExtraData = mPortIdentifiers.Length();
mPortIdentifiers.AppendElement(id.release());
return true;
}
}
{
RefPtr<TransformStream> stream;
rv = UNWRAP_OBJECT(TransformStream, &obj, stream);
if (NS_SUCCEEDED(rv)) {
MOZ_ASSERT(stream);
*aTag = SCTAG_DOM_TRANSFORMSTREAM;
*aOwnership = JS::SCTAG_TMO_CUSTOM;
*aContent = nullptr;
UniqueMessagePortId id1;
UniqueMessagePortId id2;
if (!stream->Transfer(aCx, id1, id2)) {
return false;
}
*aExtraData = mPortIdentifiers.Length();
mPortIdentifiers.AppendElement(id1.release());
mPortIdentifiers.AppendElement(id2.release());
return true;
}
}
}
return false;
}
void StructuredCloneHolder::CustomFreeTransferHandler(
uint32_t aTag, JS::TransferableOwnership aOwnership, void* aContent,
uint64_t aExtraData) {
MOZ_ASSERT(mSupportsTransferring);
if (aTag == SCTAG_DOM_MAP_MESSAGEPORT) {
MOZ_ASSERT(!aContent);
#ifdef FUZZING
if (aExtraData >= mPortIdentifiers.Length()) {
return;
}
#endif
MOZ_ASSERT(aExtraData < mPortIdentifiers.Length());
MessagePort::ForceClose(mPortIdentifiers[aExtraData]);
return;
}
if (aTag == SCTAG_DOM_CANVAS &&
CloneScope() == StructuredCloneScope::SameProcess) {
MOZ_ASSERT(aContent);
OffscreenCanvasCloneData* data =
static_cast<OffscreenCanvasCloneData*>(aContent);
delete data;
return;
}
if (aTag == SCTAG_DOM_IMAGEBITMAP &&
CloneScope() == StructuredCloneScope::SameProcess) {
MOZ_ASSERT(aContent);
ImageBitmapCloneData* data = static_cast<ImageBitmapCloneData*>(aContent);
delete data;
return;
}
if (aTag == SCTAG_DOM_READABLESTREAM || aTag == SCTAG_DOM_WRITABLESTREAM) {
MOZ_ASSERT(!aContent);
#ifdef FUZZING
if (aExtraData >= mPortIdentifiers.Length()) {
return;
}
#endif
MOZ_ASSERT(aExtraData < mPortIdentifiers.Length());
MessagePort::ForceClose(mPortIdentifiers[aExtraData]);
return;
}
if (aTag == SCTAG_DOM_TRANSFORMSTREAM) {
MOZ_ASSERT(!aContent);
#ifdef FUZZING
if (aExtraData + 1 >= mPortIdentifiers.Length()) {
return;
}
#endif
MOZ_ASSERT(aExtraData + 1 < mPortIdentifiers.Length());
MessagePort::ForceClose(mPortIdentifiers[aExtraData]);
MessagePort::ForceClose(mPortIdentifiers[aExtraData + 1]);
return;
}
if (StaticPrefs::dom_media_webcodecs_enabled() &&
aTag == SCTAG_DOM_VIDEOFRAME &&
CloneScope() == StructuredCloneScope::SameProcess) {
if (aContent) {
VideoFrame::TransferredData* data =
static_cast<VideoFrame::TransferredData*>(aContent);
delete data;
}
return;
}
}
bool StructuredCloneHolder::CustomCanTransferHandler(
JSContext* aCx, JS::Handle<JSObject*> aObj,
bool* aSameProcessScopeRequired) {
if (!mSupportsTransferring) {
return false;
}
JS::Rooted<JSObject*> obj(aCx, aObj);
{
MessagePort* port = nullptr;
nsresult rv = UNWRAP_OBJECT(MessagePort, &obj, port);
if (NS_SUCCEEDED(rv)) {
return true;
}
}
{
OffscreenCanvas* canvas = nullptr;
nsresult rv = UNWRAP_OBJECT(OffscreenCanvas, &obj, canvas);
if (NS_SUCCEEDED(rv)) {
SameProcessScopeRequired(aSameProcessScopeRequired);
return CloneScope() == StructuredCloneScope::SameProcess;
}
}
{
ImageBitmap* bitmap = nullptr;
nsresult rv = UNWRAP_OBJECT(ImageBitmap, &obj, bitmap);
if (NS_SUCCEEDED(rv)) {
if (bitmap->IsWriteOnly()) {
return false;
}
SameProcessScopeRequired(aSameProcessScopeRequired);
return CloneScope() == StructuredCloneScope::SameProcess;
}
}
{
ReadableStream* stream = nullptr;
nsresult rv = UNWRAP_OBJECT(ReadableStream, &obj, stream);
if (NS_SUCCEEDED(rv)) {
// https://streams.spec.whatwg.org/#ref-for-transfer-steps
// Step 1: If ! IsReadableStreamLocked(value) is true, throw a
// "DataCloneError" DOMException.
return !stream->Locked();
}
}
{
WritableStream* stream = nullptr;
nsresult rv = UNWRAP_OBJECT(WritableStream, &obj, stream);
if (NS_SUCCEEDED(rv)) {
// https://streams.spec.whatwg.org/#ref-for-transfer-steps①
// Step 1: If ! IsWritableStreamLocked(value) is true, throw a
// "DataCloneError" DOMException.
return !stream->Locked();
}
}
{
TransformStream* stream = nullptr;
nsresult rv = UNWRAP_OBJECT(TransformStream, &obj, stream);
if (NS_SUCCEEDED(rv)) {
// https://streams.spec.whatwg.org/#ref-for-transfer-steps②
// Step 3 + 4: If ! Is{Readable,Writable}StreamLocked(value) is true,
// throw a "DataCloneError" DOMException.
return !stream->Readable()->Locked() && !stream->Writable()->Locked();
}
}
if (StaticPrefs::dom_media_webcodecs_enabled()) {
VideoFrame* videoframe = nullptr;
nsresult rv = UNWRAP_OBJECT(VideoFrame, &obj, videoframe);
if (NS_SUCCEEDED(rv)) {
SameProcessScopeRequired(aSameProcessScopeRequired);
return CloneScope() == StructuredCloneScope::SameProcess;
}
}
return false;
}
bool StructuredCloneHolder::TakeTransferredPortsAsSequence(
Sequence<OwningNonNull<mozilla::dom::MessagePort>>& aPorts) {
nsTArray<RefPtr<MessagePort>> ports = TakeTransferredPorts();
aPorts.Clear();
for (uint32_t i = 0, len = ports.Length(); i < len; ++i) {
if (!aPorts.AppendElement(ports[i].forget(), fallible)) {
return false;
}
}
return true;
}
void StructuredCloneHolder::SameProcessScopeRequired(
bool* aSameProcessScopeRequired) {
MOZ_ASSERT(aSameProcessScopeRequired);
if (mStructuredCloneScope == StructuredCloneScope::UnknownDestination) {
mStructuredCloneScope = StructuredCloneScope::SameProcess;
*aSameProcessScopeRequired = true;
}
}
} // namespace mozilla::dom
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