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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 "StructuredCloneHolder.h"
#include "ImageContainer.h"
#include "mozilla/AutoRestore.h"
#include "mozilla/dom/BlobBinding.h"
#include "mozilla/dom/CryptoKey.h"
#include "mozilla/dom/Directory.h"
#include "mozilla/dom/DirectoryBinding.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/FileList.h"
#include "mozilla/dom/FileListBinding.h"
#include "mozilla/dom/FormData.h"
#include "mozilla/dom/ImageBitmap.h"
#include "mozilla/dom/ImageBitmapBinding.h"
#include "mozilla/dom/ImageData.h"
#include "mozilla/dom/ImageDataBinding.h"
#include "mozilla/dom/ipc/BlobChild.h"
#include "mozilla/dom/StructuredClone.h"
#include "mozilla/dom/MessagePort.h"
#include "mozilla/dom/MessagePortBinding.h"
#include "mozilla/dom/OffscreenCanvas.h"
#include "mozilla/dom/OffscreenCanvasBinding.h"
#include "mozilla/dom/PMessagePort.h"
#include "mozilla/dom/StructuredCloneTags.h"
#include "mozilla/dom/SubtleCryptoBinding.h"
#include "mozilla/dom/ToJSValue.h"
#include "mozilla/dom/URLSearchParams.h"
#include "mozilla/dom/WebCryptoCommon.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/ipc/BackgroundChild.h"
#include "mozilla/ipc/BackgroundUtils.h"
#include "mozilla/ipc/PBackgroundSharedTypes.h"
#include "MultipartBlobImpl.h"
#include "nsIRemoteBlob.h"
#include "nsQueryObject.h"
#ifdef MOZ_NFC
#include "mozilla/dom/MozNDEFRecord.h"
#endif // MOZ_NFC
#ifdef MOZ_WEBRTC
#include "mozilla/dom/RTCCertificate.h"
#include "mozilla/dom/RTCCertificateBinding.h"
#endif
using namespace mozilla::ipc;
namespace mozilla {
namespace dom {
namespace {
JSObject*
StructuredCloneCallbacksRead(JSContext* aCx,
JSStructuredCloneReader* aReader,
uint32_t aTag, uint32_t aIndex,
void* aClosure)
{
StructuredCloneHolderBase* holder =
static_cast<StructuredCloneHolderBase*>(aClosure);
MOZ_ASSERT(holder);
return holder->CustomReadHandler(aCx, aReader, aTag, aIndex);
}
bool
StructuredCloneCallbacksWrite(JSContext* aCx,
JSStructuredCloneWriter* aWriter,
JS::Handle<JSObject*> aObj,
void* aClosure)
{
StructuredCloneHolderBase* holder =
static_cast<StructuredCloneHolderBase*>(aClosure);
MOZ_ASSERT(holder);
return holder->CustomWriteHandler(aCx, aWriter, aObj);
}
bool
StructuredCloneCallbacksReadTransfer(JSContext* aCx,
JSStructuredCloneReader* aReader,
uint32_t aTag,
void* aContent,
uint64_t aExtraData,
void* aClosure,
JS::MutableHandleObject 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);
}
void
StructuredCloneCallbacksError(JSContext* aCx,
uint32_t aErrorId)
{
NS_WARNING("Failed to clone data.");
}
const JSStructuredCloneCallbacks gCallbacks = {
StructuredCloneCallbacksRead,
StructuredCloneCallbacksWrite,
StructuredCloneCallbacksError,
StructuredCloneCallbacksReadTransfer,
StructuredCloneCallbacksWriteTransfer,
StructuredCloneCallbacksFreeTransfer
};
} // anonymous namespace
// StructuredCloneHolderBase class
StructuredCloneHolderBase::StructuredCloneHolderBase()
#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);
}
bool
StructuredCloneHolderBase::Write(JSContext* aCx,
JS::Handle<JS::Value> aValue,
JS::Handle<JS::Value> aTransfer)
{
MOZ_ASSERT(!mBuffer, "Double Write is not allowed");
MOZ_ASSERT(!mClearCalled, "This method cannot be called after Clear.");
mBuffer = new JSAutoStructuredCloneBuffer(&gCallbacks, this);
if (!mBuffer->write(aCx, aValue, aTransfer, &gCallbacks, this)) {
mBuffer = nullptr;
return false;
}
return true;
}
bool
StructuredCloneHolderBase::Read(JSContext* aCx,
JS::MutableHandle<JS::Value> aValue)
{
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, &gCallbacks, this);
return ok;
}
bool
StructuredCloneHolderBase::CustomReadTransferHandler(JSContext* aCx,
JSStructuredCloneReader* aReader,
uint32_t aTag,
void* aContent,
uint64_t aExtraData,
JS::MutableHandleObject 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.");
}
// StructuredCloneHolder class
StructuredCloneHolder::StructuredCloneHolder(CloningSupport aSupportsCloning,
TransferringSupport aSupportsTransferring,
ContextSupport aContext)
: mSupportsCloning(aSupportsCloning == CloningSupported)
, mSupportsTransferring(aSupportsTransferring == TransferringSupported)
, mSupportedContext(aContext)
, mParent(nullptr)
#ifdef DEBUG
, mCreationThread(NS_GetCurrentThread())
#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, aRv);
}
void
StructuredCloneHolder::Write(JSContext* aCx,
JS::Handle<JS::Value> aValue,
JS::Handle<JS::Value> aTransfer,
ErrorResult& aRv)
{
MOZ_ASSERT_IF(mSupportedContext == SameProcessSameThread,
mCreationThread == NS_GetCurrentThread());
if (!StructuredCloneHolderBase::Write(aCx, aValue, aTransfer)) {
aRv.Throw(NS_ERROR_DOM_DATA_CLONE_ERR);
return;
}
if (mSupportedContext != SameProcessSameThread) {
for (uint32_t i = 0, len = mBlobImplArray.Length(); i < len; ++i) {
if (!mBlobImplArray[i]->MayBeClonedToOtherThreads()) {
aRv.Throw(NS_ERROR_DOM_DATA_CLONE_ERR);
return;
}
}
}
}
void
StructuredCloneHolder::Read(nsISupports* aParent,
JSContext* aCx,
JS::MutableHandle<JS::Value> aValue,
ErrorResult& aRv)
{
MOZ_ASSERT_IF(mSupportedContext == SameProcessSameThread,
mCreationThread == NS_GetCurrentThread());
MOZ_ASSERT(aParent);
mozilla::AutoRestore<nsISupports*> guard(mParent);
mParent = aParent;
if (!StructuredCloneHolderBase::Read(aCx, aValue)) {
JS_ClearPendingException(aCx);
aRv.Throw(NS_ERROR_DOM_DATA_CLONE_ERR);
}
// If we are tranferring something, we cannot call 'Read()' more than once.
if (mSupportsTransferring) {
mBlobImplArray.Clear();
mClonedSurfaces.Clear();
Clear();
}
}
void
StructuredCloneHolder::ReadFromBuffer(nsISupports* aParent,
JSContext* aCx,
uint64_t* aBuffer,
size_t aBufferLength,
JS::MutableHandle<JS::Value> aValue,
ErrorResult& aRv)
{
ReadFromBuffer(aParent, aCx, aBuffer, aBufferLength,
JS_STRUCTURED_CLONE_VERSION, aValue, aRv);
}
void
StructuredCloneHolder::ReadFromBuffer(nsISupports* aParent,
JSContext* aCx,
uint64_t* aBuffer,
size_t aBufferLength,
uint32_t aAlgorithmVersion,
JS::MutableHandle<JS::Value> aValue,
ErrorResult& aRv)
{
MOZ_ASSERT_IF(mSupportedContext == SameProcessSameThread,
mCreationThread == NS_GetCurrentThread());
MOZ_ASSERT(!mBuffer, "ReadFromBuffer() must be called without a Write().");
MOZ_ASSERT(aBuffer);
mozilla::AutoRestore<nsISupports*> guard(mParent);
mParent = aParent;
if (!JS_ReadStructuredClone(aCx, aBuffer, aBufferLength, aAlgorithmVersion,
aValue, &gCallbacks, this)) {
JS_ClearPendingException(aCx);
aRv.Throw(NS_ERROR_DOM_DATA_CLONE_ERR);
}
}
void
StructuredCloneHolder::MoveBufferDataToArray(FallibleTArray<uint8_t>& aArray,
ErrorResult& aRv)
{
MOZ_ASSERT_IF(mSupportedContext == SameProcessSameThread,
mCreationThread == NS_GetCurrentThread());
MOZ_ASSERT(mBuffer, "MoveBuffer() cannot be called without a Write().");
if (NS_WARN_IF(!aArray.SetLength(BufferSize(), mozilla::fallible))) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return;
}
uint64_t* buffer;
size_t size;
mBuffer->steal(&buffer, &size);
mBuffer = nullptr;
memcpy(aArray.Elements(), buffer, size);
js_free(buffer);
}
void
StructuredCloneHolder::FreeBuffer(uint64_t* aBuffer,
size_t aBufferLength)
{
MOZ_ASSERT(!mBuffer, "FreeBuffer() must be called without a Write().");
MOZ_ASSERT(aBuffer);
MOZ_ASSERT(aBufferLength);
JS_ClearStructuredClone(aBuffer, aBufferLength, &gCallbacks, this, false);
}
/* static */ JSObject*
StructuredCloneHolder::ReadFullySerializableObjects(JSContext* aCx,
JSStructuredCloneReader* aReader,
uint32_t aTag)
{
if (aTag == SCTAG_DOM_IMAGEDATA) {
return ReadStructuredCloneImageData(aCx, aReader);
}
if (aTag == SCTAG_DOM_WEBCRYPTO_KEY || aTag == SCTAG_DOM_URLSEARCHPARAMS) {
nsIGlobalObject *global = xpc::NativeGlobal(JS::CurrentGlobalOrNull(aCx));
if (!global) {
return nullptr;
}
// Prevent the return value from being trashed by a GC during ~nsRefPtr.
JS::Rooted<JSObject*> result(aCx);
{
if (aTag == SCTAG_DOM_WEBCRYPTO_KEY) {
RefPtr<CryptoKey> key = new CryptoKey(global);
if (!key->ReadStructuredClone(aReader)) {
result = nullptr;
} else {
result = key->WrapObject(aCx, nullptr);
}
} else if (aTag == SCTAG_DOM_URLSEARCHPARAMS) {
RefPtr<URLSearchParams> usp = new URLSearchParams(global);
if (!usp->ReadStructuredClone(aReader)) {
result = nullptr;
} else {
result = usp->WrapObject(aCx, nullptr);
}
}
}
return result;
}
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;
}
// 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));
JS::RootedValue result(aCx);
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();
}
#ifdef MOZ_NFC
if (aTag == SCTAG_DOM_NFC_NDEF) {
if (!NS_IsMainThread()) {
return nullptr;
}
nsIGlobalObject *global = xpc::NativeGlobal(JS::CurrentGlobalOrNull(aCx));
if (!global) {
return nullptr;
}
// Prevent the return value from being trashed by a GC during ~nsRefPtr.
JS::Rooted<JSObject*> result(aCx);
{
RefPtr<MozNDEFRecord> ndefRecord = new MozNDEFRecord(global);
result = ndefRecord->ReadStructuredClone(aCx, aReader) ?
ndefRecord->WrapObject(aCx, nullptr) : nullptr;
}
return result;
}
#endif
#ifdef MOZ_WEBRTC
if (aTag == SCTAG_DOM_RTC_CERTIFICATE) {
if (!NS_IsMainThread()) {
return nullptr;
}
nsIGlobalObject *global = xpc::NativeGlobal(JS::CurrentGlobalOrNull(aCx));
if (!global) {
return nullptr;
}
// Prevent the return value from being trashed by a GC during ~nsRefPtr.
JS::Rooted<JSObject*> result(aCx);
{
RefPtr<RTCCertificate> cert = new RTCCertificate(global);
if (!cert->ReadStructuredClone(aReader)) {
result = nullptr;
} else {
result = cert->WrapObject(aCx, nullptr);
}
}
return result;
}
#endif
// 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)
{
// See if this is a ImageData object.
{
ImageData* imageData = nullptr;
if (NS_SUCCEEDED(UNWRAP_OBJECT(ImageData, aObj, imageData))) {
return WriteStructuredCloneImageData(aCx, aWriter, imageData);
}
}
// Handle URLSearchParams cloning
{
URLSearchParams* usp = nullptr;
if (NS_SUCCEEDED(UNWRAP_OBJECT(URLSearchParams, aObj, usp))) {
return JS_WriteUint32Pair(aWriter, SCTAG_DOM_URLSEARCHPARAMS, 0) &&
usp->WriteStructuredClone(aWriter);
}
}
// Handle Key cloning
{
CryptoKey* key = nullptr;
if (NS_SUCCEEDED(UNWRAP_OBJECT(CryptoKey, aObj, key))) {
return JS_WriteUint32Pair(aWriter, SCTAG_DOM_WEBCRYPTO_KEY, 0) &&
key->WriteStructuredClone(aWriter);
}
}
#ifdef MOZ_WEBRTC
{
// Handle WebRTC Certificate cloning
RTCCertificate* cert = nullptr;
if (NS_SUCCEEDED(UNWRAP_OBJECT(RTCCertificate, aObj, cert))) {
MOZ_ASSERT(NS_IsMainThread());
return JS_WriteUint32Pair(aWriter, SCTAG_DOM_RTC_CERTIFICATE, 0) &&
cert->WriteStructuredClone(aWriter);
}
}
#endif
if (NS_IsMainThread() && xpc::IsReflector(aObj)) {
nsCOMPtr<nsISupports> base = xpc::UnwrapReflectorToISupports(aObj);
nsCOMPtr<nsIPrincipal> principal = do_QueryInterface(base);
if (principal) {
auto nsjsprincipals = nsJSPrincipals::get(principal);
return nsjsprincipals->write(aCx, aWriter);
}
}
#ifdef MOZ_NFC
{
MozNDEFRecord* ndefRecord = nullptr;
if (NS_SUCCEEDED(UNWRAP_OBJECT(MozNDEFRecord, aObj, ndefRecord))) {
MOZ_ASSERT(NS_IsMainThread());
return JS_WriteUint32Pair(aWriter, SCTAG_DOM_NFC_NDEF, 0) &&
ndefRecord->WriteStructuredClone(aCx, aWriter);
}
}
#endif // MOZ_NFC
// Don't know what this is
xpc::Throw(aCx, NS_ERROR_DOM_DATA_CLONE_ERR);
return false;
}
namespace {
// Recursive!
already_AddRefed<BlobImpl>
EnsureBlobForBackgroundManager(BlobImpl* aBlobImpl,
PBackgroundChild* aManager,
ErrorResult& aRv)
{
MOZ_ASSERT(aBlobImpl);
RefPtr<BlobImpl> blobImpl = aBlobImpl;
if (!aManager) {
aManager = BackgroundChild::GetForCurrentThread();
if (!aManager) {
return blobImpl.forget();
}
}
const nsTArray<RefPtr<BlobImpl>>* subBlobImpls =
aBlobImpl->GetSubBlobImpls();
if (!subBlobImpls || !subBlobImpls->Length()) {
if (nsCOMPtr<nsIRemoteBlob> remoteBlob = do_QueryObject(blobImpl)) {
// Always make sure we have a blob from an actor we can use on this
// thread.
BlobChild* blobChild = BlobChild::GetOrCreate(aManager, blobImpl);
MOZ_ASSERT(blobChild);
blobImpl = blobChild->GetBlobImpl();
MOZ_ASSERT(blobImpl);
DebugOnly<bool> isMutable;
MOZ_ASSERT(NS_SUCCEEDED(blobImpl->GetMutable(&isMutable)));
MOZ_ASSERT(!isMutable);
} else {
MOZ_ALWAYS_SUCCEEDS(blobImpl->SetMutable(false));
}
return blobImpl.forget();
}
const uint32_t subBlobCount = subBlobImpls->Length();
MOZ_ASSERT(subBlobCount);
nsTArray<RefPtr<BlobImpl>> newSubBlobImpls;
newSubBlobImpls.SetLength(subBlobCount);
bool newBlobImplNeeded = false;
for (uint32_t index = 0; index < subBlobCount; index++) {
const RefPtr<BlobImpl>& subBlobImpl = subBlobImpls->ElementAt(index);
MOZ_ASSERT(subBlobImpl);
RefPtr<BlobImpl>& newSubBlobImpl = newSubBlobImpls[index];
newSubBlobImpl = EnsureBlobForBackgroundManager(subBlobImpl, aManager, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
MOZ_ASSERT(newSubBlobImpl);
if (subBlobImpl != newSubBlobImpl) {
newBlobImplNeeded = true;
}
}
if (newBlobImplNeeded) {
nsString contentType;
blobImpl->GetType(contentType);
if (blobImpl->IsFile()) {
nsString name;
blobImpl->GetName(name);
blobImpl = MultipartBlobImpl::Create(newSubBlobImpls, name,
contentType, aRv);
} else {
blobImpl = MultipartBlobImpl::Create(newSubBlobImpls, contentType, aRv);
}
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
MOZ_ALWAYS_SUCCEEDS(blobImpl->SetMutable(false));
}
return blobImpl.forget();
}
JSObject*
ReadBlob(JSContext* aCx,
uint32_t aIndex,
StructuredCloneHolder* aHolder)
{
MOZ_ASSERT(aHolder);
MOZ_ASSERT(aIndex < aHolder->BlobImpls().Length());
RefPtr<BlobImpl> blobImpl = aHolder->BlobImpls()[aIndex];
ErrorResult rv;
blobImpl = EnsureBlobForBackgroundManager(blobImpl, nullptr, rv);
if (NS_WARN_IF(rv.Failed())) {
rv.SuppressException();
return nullptr;
}
MOZ_ASSERT(blobImpl);
// RefPtr<File> 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<Blob> blob = Blob::Create(aHolder->ParentDuringRead(), blobImpl);
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);
ErrorResult rv;
RefPtr<BlobImpl> blobImpl =
EnsureBlobForBackgroundManager(aBlob->Impl(), nullptr, rv);
if (NS_WARN_IF(rv.Failed())) {
rv.SuppressException();
return false;
}
MOZ_ASSERT(blobImpl);
MOZ_ALWAYS_SUCCEEDS(blobImpl->SetMutable(false));
// 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;
path.SetLength(aPathLength);
size_t charSize = sizeof(nsString::char_type);
if (!JS_ReadBytes(aReader, (void*) path.BeginWriting(),
aPathLength * charSize)) {
return nullptr;
}
nsCOMPtr<nsIFile> file;
nsresult rv = NS_NewNativeLocalFile(NS_ConvertUTF16toUTF8(path), true,
getter_AddRefs(file));
if (NS_WARN_IF(NS_FAILED(rv))) {
return nullptr;
}
RefPtr<Directory> directory =
Directory::Create(aHolder->ParentDuringRead(), 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->ParentDuringRead());
uint32_t zero, index;
// |index| is the index of the first blobImpl.
if (!JS_ReadUint32Pair(aReader, &zero, &index)) {
return nullptr;
}
MOZ_ASSERT(zero == 0);
// |aCount| is the number of BlobImpls to use from the |index|.
for (uint32_t i = 0; i < aCount; ++i) {
uint32_t pos = index + i;
MOZ_ASSERT(pos < aHolder->BlobImpls().Length());
RefPtr<BlobImpl> blobImpl = aHolder->BlobImpls()[pos];
MOZ_ASSERT(blobImpl->IsFile());
ErrorResult rv;
blobImpl = EnsureBlobForBackgroundManager(blobImpl, nullptr, rv);
if (NS_WARN_IF(rv.Failed())) {
rv.SuppressException();
return nullptr;
}
MOZ_ASSERT(blobImpl);
RefPtr<File> file = File::Create(aHolder->ParentDuringRead(), blobImpl);
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;
}
ErrorResult rv;
nsTArray<RefPtr<BlobImpl>> blobImpls;
for (uint32_t i = 0; i < aFileList->Length(); ++i) {
RefPtr<BlobImpl> blobImpl =
EnsureBlobForBackgroundManager(aFileList->Item(i)->Impl(), nullptr, rv);
if (NS_WARN_IF(rv.Failed())) {
rv.SuppressException();
return false;
}
MOZ_ASSERT(blobImpl);
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->ParentDuringRead());
Optional<nsAString> thirdArg;
for (uint32_t i = 0; i < aCount; ++i) {
nsAutoString name;
if (!ReadString(aReader, name)) {
return nullptr;
}
uint32_t tag, indexOrLengthOfString;
if (!JS_ReadUint32Pair(aReader, &tag, &indexOrLengthOfString)) {
return nullptr;
}
if (tag == SCTAG_DOM_BLOB) {
MOZ_ASSERT(indexOrLengthOfString < aHolder->BlobImpls().Length());
RefPtr<BlobImpl> blobImpl =
aHolder->BlobImpls()[indexOrLengthOfString];
RefPtr<Blob> blob =
Blob::Create(aHolder->ParentDuringRead(), blobImpl);
MOZ_ASSERT(blob);
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 {
MOZ_ASSERT(tag == 0);
nsAutoString value;
value.SetLength(indexOrLengthOfString);
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 (!WriteString(closure->mWriter, aName)) {
return false;
}
if (aValue.IsBlob()) {
BlobImpl* blobImpl = aValue.GetAsBlob()->Impl();
if (!JS_WriteUint32Pair(closure->mWriter, SCTAG_DOM_BLOB,
closure->mHolder->BlobImpls().Length())) {
return false;
}
closure->mHolder->BlobImpls().AppendElement(blobImpl);
return true;
}
if (aValue.IsDirectory()) {
Directory* directory = aValue.GetAsDirectory();
if (closure->mHolder->SupportedContext() !=
StructuredCloneHolder::SameProcessSameThread &&
!directory->ClonableToDifferentThreadOrProcess()) {
return false;
}
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);
}
} // anonymous namespace
JSObject*
StructuredCloneHolder::CustomReadHandler(JSContext* aCx,
JSStructuredCloneReader* aReader,
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) {
MOZ_ASSERT(mSupportedContext == SameProcessSameThread ||
mSupportedContext == SameProcessDifferentThread);
// Get the current global object.
// This can be null.
nsCOMPtr<nsIGlobalObject> parent = do_QueryInterface(mParent);
// aIndex is the index of the cloned image.
return ImageBitmap::ReadStructuredClone(aCx, aReader,
parent, GetSurfaces(), aIndex);
}
return ReadFullySerializableObjects(aCx, aReader, aTag);
}
bool
StructuredCloneHolder::CustomWriteHandler(JSContext* aCx,
JSStructuredCloneWriter* aWriter,
JS::Handle<JSObject*> aObj)
{
if (!mSupportsCloning) {
return false;
}
// See if this is a File/Blob object.
{
Blob* blob = nullptr;
if (NS_SUCCEEDED(UNWRAP_OBJECT(Blob, aObj, blob))) {
return WriteBlob(aWriter, blob, this);
}
}
// See if this is a Directory object.
{
Directory* directory = nullptr;
if (NS_SUCCEEDED(UNWRAP_OBJECT(Directory, aObj, directory))) {
if (mSupportedContext != SameProcessSameThread &&
!directory->ClonableToDifferentThreadOrProcess()) {
return false;
}
return WriteDirectory(aWriter, directory);
}
}
// See if this is a FileList object.
{
FileList* fileList = nullptr;
if (NS_SUCCEEDED(UNWRAP_OBJECT(FileList, aObj, fileList))) {
return WriteFileList(aWriter, fileList, this);
}
}
// See if this is a FormData object.
{
FormData* formData = nullptr;
if (NS_SUCCEEDED(UNWRAP_OBJECT(FormData, aObj, formData))) {
return WriteFormData(aWriter, formData, this);
}
}
// See if this is an ImageBitmap object.
if (mSupportedContext == SameProcessSameThread ||
mSupportedContext == SameProcessDifferentThread) {
ImageBitmap* imageBitmap = nullptr;
if (NS_SUCCEEDED(UNWRAP_OBJECT(ImageBitmap, aObj, imageBitmap))) {
return ImageBitmap::WriteStructuredClone(aWriter,
GetSurfaces(),
imageBitmap);
}
}
return WriteFullySerializableObjects(aCx, aWriter, aObj);
}
bool
StructuredCloneHolder::CustomReadTransferHandler(JSContext* aCx,
JSStructuredCloneReader* aReader,
uint32_t aTag,
void* aContent,
uint64_t aExtraData,
JS::MutableHandleObject aReturnObject)
{
MOZ_ASSERT(mSupportsTransferring);
if (aTag == SCTAG_DOM_MAP_MESSAGEPORT) {
MOZ_ASSERT(aExtraData < mPortIdentifiers.Length());
const MessagePortIdentifier& portIdentifier = mPortIdentifiers[aExtraData];
nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(mParent);
ErrorResult rv;
RefPtr<MessagePort> port =
MessagePort::Create(global, portIdentifier, rv);
if (NS_WARN_IF(rv.Failed())) {
rv.SuppressException();
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) {
MOZ_ASSERT(mSupportedContext == SameProcessSameThread ||
mSupportedContext == SameProcessDifferentThread);
MOZ_ASSERT(aContent);
OffscreenCanvasCloneData* data =
static_cast<OffscreenCanvasCloneData*>(aContent);
nsCOMPtr<nsIGlobalObject> parent = do_QueryInterface(mParent);
RefPtr<OffscreenCanvas> canvas = OffscreenCanvas::CreateFromCloneData(parent, 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) {
MOZ_ASSERT(mSupportedContext == SameProcessSameThread ||
mSupportedContext == SameProcessDifferentThread);
MOZ_ASSERT(aContent);
ImageBitmapCloneData* data =
static_cast<ImageBitmapCloneData*>(aContent);
nsCOMPtr<nsIGlobalObject> parent = do_QueryInterface(mParent);
RefPtr<ImageBitmap> bitmap = ImageBitmap::CreateFromCloneData(parent, 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;
}
return false;
}
bool
StructuredCloneHolder::CustomWriteTransferHandler(JSContext* aCx,
JS::Handle<JSObject*> aObj,
uint32_t* aTag,
JS::TransferableOwnership* aOwnership,
void** aContent,
uint64_t* aExtraData)
{
if (!mSupportsTransferring) {
return false;
}
{
MessagePort* port = nullptr;
nsresult rv = UNWRAP_OBJECT(MessagePort, aObj, port);
if (NS_SUCCEEDED(rv)) {
// We use aExtraData to store the index of this new port identifier.
*aExtraData = mPortIdentifiers.Length();
MessagePortIdentifier* identifier = mPortIdentifiers.AppendElement();
port->CloneAndDisentangle(*identifier);
*aTag = SCTAG_DOM_MAP_MESSAGEPORT;
*aOwnership = JS::SCTAG_TMO_CUSTOM;
*aContent = nullptr;
return true;
}
if (mSupportedContext == SameProcessSameThread ||
mSupportedContext == SameProcessDifferentThread) {
OffscreenCanvas* canvas = nullptr;
rv = UNWRAP_OBJECT(OffscreenCanvas, aObj, canvas);
if (NS_SUCCEEDED(rv)) {
MOZ_ASSERT(canvas);
*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, aObj, bitmap);
if (NS_SUCCEEDED(rv)) {
MOZ_ASSERT(bitmap);
*aExtraData = 0;
*aTag = SCTAG_DOM_IMAGEBITMAP;
*aOwnership = JS::SCTAG_TMO_CUSTOM;
*aContent = bitmap->ToCloneData();
MOZ_ASSERT(*aContent);
bitmap->Close();
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);
MOZ_ASSERT(aExtraData < mPortIdentifiers.Length());
MessagePort::ForceClose(mPortIdentifiers[aExtraData]);
return;
}
if (aTag == SCTAG_DOM_CANVAS) {
MOZ_ASSERT(mSupportedContext == SameProcessSameThread ||
mSupportedContext == SameProcessDifferentThread);
MOZ_ASSERT(aContent);
OffscreenCanvasCloneData* data =
static_cast<OffscreenCanvasCloneData*>(aContent);
delete data;
return;
}
if (aTag == SCTAG_DOM_IMAGEBITMAP) {
MOZ_ASSERT(mSupportedContext == SameProcessSameThread ||
mSupportedContext == SameProcessDifferentThread);
MOZ_ASSERT(aContent);
ImageBitmapCloneData* data =
static_cast<ImageBitmapCloneData*>(aContent);
delete data;
return;
}
}
} // dom namespace
} // mozilla namespace
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