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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
#include "mozilla/ArrayUtils.h"
#include "mozilla/BasePrincipal.h"
#include "mozilla/BasicEvents.h"
#include "mozilla/CheckedInt.h"
#include "mozilla/Span.h"
#include "mozilla/StaticPrefs_dom.h"
#include "DataTransfer.h"
#include "nsISupportsPrimitives.h"
#include "nsIScriptSecurityManager.h"
#include "mozilla/dom/DOMStringList.h"
#include "nsArray.h"
#include "nsError.h"
#include "nsIDragService.h"
#include "nsIClipboard.h"
#include "nsIXPConnect.h"
#include "nsContentUtils.h"
#include "nsIContent.h"
#include "nsIObjectInputStream.h"
#include "nsIObjectOutputStream.h"
#include "nsIStorageStream.h"
#include "nsStringStream.h"
#include "nsCRT.h"
#include "nsIScriptObjectPrincipal.h"
#include "nsIScriptContext.h"
#include "mozilla/dom/Document.h"
#include "nsIScriptGlobalObject.h"
#include "nsQueryObject.h"
#include "nsVariant.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/dom/DataTransferBinding.h"
#include "mozilla/dom/DataTransferItemList.h"
#include "mozilla/dom/Directory.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/FileList.h"
#include "mozilla/dom/IPCBlobUtils.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/OSFileSystem.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/WindowContext.h"
#include "mozilla/Unused.h"
#include "nsComponentManagerUtils.h"
#include "nsNetUtil.h"
#include "nsReadableUtils.h"
namespace mozilla::dom {
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(DataTransfer)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(DataTransfer)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mParent)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mItems)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mDragTarget)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mDragImage)
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(DataTransfer)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mItems)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDragTarget)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDragImage)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(DataTransfer)
NS_IMPL_CYCLE_COLLECTING_RELEASE(DataTransfer)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DataTransfer)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(mozilla::dom::DataTransfer)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
// the size of the array
const char DataTransfer::sEffects[8][9] = {
"none", "copy", "move", "copyMove", "link", "copyLink", "linkMove", "all"};
// Used for custom clipboard types.
enum CustomClipboardTypeId {
eCustomClipboardTypeId_None,
eCustomClipboardTypeId_String
};
static DataTransfer::Mode ModeForEvent(EventMessage aEventMessage) {
switch (aEventMessage) {
case eCut:
case eCopy:
case eDragStart:
// For these events, we want to be able to add data to the data transfer,
// Otherwise, the data is already present.
return DataTransfer::Mode::ReadWrite;
case eDrop:
case ePaste:
case ePasteNoFormatting:
case eEditorInput:
// For these events we want to be able to read the data which is stored in
// the DataTransfer, rather than just the type information.
return DataTransfer::Mode::ReadOnly;
default:
return StaticPrefs::dom_events_dataTransfer_protected_enabled()
? DataTransfer::Mode::Protected
: DataTransfer::Mode::ReadOnly;
}
}
DataTransfer::DataTransfer(nsISupports* aParent, EventMessage aEventMessage,
bool aIsExternal, int32_t aClipboardType)
: mParent(aParent),
mDropEffect(nsIDragService::DRAGDROP_ACTION_NONE),
mEffectAllowed(nsIDragService::DRAGDROP_ACTION_UNINITIALIZED),
mEventMessage(aEventMessage),
mCursorState(false),
mMode(ModeForEvent(aEventMessage)),
mIsExternal(aIsExternal),
mUserCancelled(false),
mIsCrossDomainSubFrameDrop(false),
mClipboardType(aClipboardType),
mDragImageX(0),
mDragImageY(0) {
mItems = new DataTransferItemList(this);
// For external usage, cache the data from the native clipboard or drag.
if (mIsExternal && mMode != Mode::ReadWrite) {
if (aEventMessage == ePasteNoFormatting) {
mEventMessage = ePaste;
CacheExternalClipboardFormats(true);
} else if (aEventMessage == ePaste) {
CacheExternalClipboardFormats(false);
} else if (aEventMessage >= eDragDropEventFirst &&
aEventMessage <= eDragDropEventLast) {
CacheExternalDragFormats();
}
}
}
DataTransfer::DataTransfer(nsISupports* aParent, EventMessage aEventMessage,
nsITransferable* aTransferable)
: mParent(aParent),
mTransferable(aTransferable),
mDropEffect(nsIDragService::DRAGDROP_ACTION_NONE),
mEffectAllowed(nsIDragService::DRAGDROP_ACTION_UNINITIALIZED),
mEventMessage(aEventMessage),
mCursorState(false),
mMode(ModeForEvent(aEventMessage)),
mIsExternal(true),
mUserCancelled(false),
mIsCrossDomainSubFrameDrop(false),
mClipboardType(-1),
mDragImageX(0),
mDragImageY(0) {
mItems = new DataTransferItemList(this);
// XXX Currently, we cannot make DataTransfer grabs mTransferable for long
// time because nsITransferable is not cycle collectable but this may
// be grabbed by JS. Additionally, the data initializing path is too
// complicated (too optimized) for D&D and clipboard. They are cached
// only formats first, then, data of all items will be filled by the
// items later and by themselves. However, we shouldn't duplicate such
// path for saving the maintenance cost. Therefore, we need to treat
// that DataTransfer and its items are in external mode. Finally,
// release mTransferable and make them in internal mode.
CacheTransferableFormats();
FillAllExternalData();
// Now, we have all necessary data of mTransferable. So, we can work as
// internal mode.
mIsExternal = false;
// Release mTransferable because it won't be referred anymore.
mTransferable = nullptr;
}
DataTransfer::DataTransfer(nsISupports* aParent, EventMessage aEventMessage,
const nsAString& aString)
: mParent(aParent),
mDropEffect(nsIDragService::DRAGDROP_ACTION_NONE),
mEffectAllowed(nsIDragService::DRAGDROP_ACTION_UNINITIALIZED),
mEventMessage(aEventMessage),
mCursorState(false),
mMode(ModeForEvent(aEventMessage)),
mIsExternal(false),
mUserCancelled(false),
mIsCrossDomainSubFrameDrop(false),
mClipboardType(-1),
mDragImageX(0),
mDragImageY(0) {
mItems = new DataTransferItemList(this);
nsCOMPtr<nsIPrincipal> sysPrincipal = nsContentUtils::GetSystemPrincipal();
RefPtr<nsVariantCC> variant = new nsVariantCC();
variant->SetAsAString(aString);
DebugOnly<nsresult> rvIgnored =
SetDataWithPrincipal(u"text/plain"_ns, variant, 0, sysPrincipal, false);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rvIgnored),
"Failed to set given string to the DataTransfer object");
}
DataTransfer::DataTransfer(nsISupports* aParent, EventMessage aEventMessage,
const uint32_t aEffectAllowed, bool aCursorState,
bool aIsExternal, bool aUserCancelled,
bool aIsCrossDomainSubFrameDrop,
int32_t aClipboardType, DataTransferItemList* aItems,
Element* aDragImage, uint32_t aDragImageX,
uint32_t aDragImageY, bool aShowFailAnimation)
: mParent(aParent),
mDropEffect(nsIDragService::DRAGDROP_ACTION_NONE),
mEffectAllowed(aEffectAllowed),
mEventMessage(aEventMessage),
mCursorState(aCursorState),
mMode(ModeForEvent(aEventMessage)),
mIsExternal(aIsExternal),
mUserCancelled(aUserCancelled),
mIsCrossDomainSubFrameDrop(aIsCrossDomainSubFrameDrop),
mClipboardType(aClipboardType),
mDragImage(aDragImage),
mDragImageX(aDragImageX),
mDragImageY(aDragImageY),
mShowFailAnimation(aShowFailAnimation) {
MOZ_ASSERT(mParent);
MOZ_ASSERT(aItems);
// We clone the items array after everything else, so that it has a valid
// mParent value
mItems = aItems->Clone(this);
// The items are copied from aItems into mItems. There is no need to copy
// the actual data in the items as the data transfer will be read only. The
// dragstart event is the only time when items are
// modifiable, but those events should have been using the first constructor
// above.
NS_ASSERTION(aEventMessage != eDragStart,
"invalid event type for DataTransfer constructor");
}
DataTransfer::~DataTransfer() = default;
// static
already_AddRefed<DataTransfer> DataTransfer::Constructor(
const GlobalObject& aGlobal) {
RefPtr<DataTransfer> transfer =
new DataTransfer(aGlobal.GetAsSupports(), eCopy, /* is external */ false,
/* clipboard type */ -1);
transfer->mEffectAllowed = nsIDragService::DRAGDROP_ACTION_NONE;
return transfer.forget();
}
JSObject* DataTransfer::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return DataTransfer_Binding::Wrap(aCx, this, aGivenProto);
}
void DataTransfer::SetDropEffect(const nsAString& aDropEffect) {
// the drop effect can only be 'none', 'copy', 'move' or 'link'.
for (uint32_t e = 0; e <= nsIDragService::DRAGDROP_ACTION_LINK; e++) {
if (aDropEffect.EqualsASCII(sEffects[e])) {
// don't allow copyMove
if (e != (nsIDragService::DRAGDROP_ACTION_COPY |
nsIDragService::DRAGDROP_ACTION_MOVE)) {
mDropEffect = e;
}
break;
}
}
}
void DataTransfer::SetEffectAllowed(const nsAString& aEffectAllowed) {
if (aEffectAllowed.EqualsLiteral("uninitialized")) {
mEffectAllowed = nsIDragService::DRAGDROP_ACTION_UNINITIALIZED;
return;
}
static_assert(nsIDragService::DRAGDROP_ACTION_NONE == 0,
"DRAGDROP_ACTION_NONE constant is wrong");
static_assert(nsIDragService::DRAGDROP_ACTION_COPY == 1,
"DRAGDROP_ACTION_COPY constant is wrong");
static_assert(nsIDragService::DRAGDROP_ACTION_MOVE == 2,
"DRAGDROP_ACTION_MOVE constant is wrong");
static_assert(nsIDragService::DRAGDROP_ACTION_LINK == 4,
"DRAGDROP_ACTION_LINK constant is wrong");
for (uint32_t e = 0; e < ArrayLength(sEffects); e++) {
if (aEffectAllowed.EqualsASCII(sEffects[e])) {
mEffectAllowed = e;
break;
}
}
}
void DataTransfer::GetMozTriggeringPrincipalURISpec(
nsAString& aPrincipalURISpec) {
nsCOMPtr<nsIDragSession> dragSession = nsContentUtils::GetDragSession();
if (!dragSession) {
aPrincipalURISpec.Truncate(0);
return;
}
nsCOMPtr<nsIPrincipal> principal;
dragSession->GetTriggeringPrincipal(getter_AddRefs(principal));
if (!principal) {
aPrincipalURISpec.Truncate(0);
return;
}
nsAutoCString spec;
principal->GetAsciiSpec(spec);
CopyUTF8toUTF16(spec, aPrincipalURISpec);
}
nsIContentSecurityPolicy* DataTransfer::GetMozCSP() {
nsCOMPtr<nsIDragSession> dragSession = nsContentUtils::GetDragSession();
if (!dragSession) {
return nullptr;
}
nsCOMPtr<nsIContentSecurityPolicy> csp;
dragSession->GetCsp(getter_AddRefs(csp));
return csp;
}
already_AddRefed<FileList> DataTransfer::GetFiles(
nsIPrincipal& aSubjectPrincipal) {
return mItems->Files(&aSubjectPrincipal);
}
void DataTransfer::GetTypes(nsTArray<nsString>& aTypes,
CallerType aCallerType) const {
// When called from bindings, aTypes will be empty, but since we might have
// Gecko-internal callers too, clear it to be safe.
aTypes.Clear();
return mItems->GetTypes(aTypes, aCallerType);
}
bool DataTransfer::HasType(const nsAString& aType) const {
return mItems->HasType(aType);
}
bool DataTransfer::HasFile() const { return mItems->HasFile(); }
void DataTransfer::GetData(const nsAString& aFormat, nsAString& aData,
nsIPrincipal& aSubjectPrincipal,
ErrorResult& aRv) const {
// return an empty string if data for the format was not found
aData.Truncate();
nsCOMPtr<nsIVariant> data;
nsresult rv =
GetDataAtInternal(aFormat, 0, &aSubjectPrincipal, getter_AddRefs(data));
if (NS_FAILED(rv)) {
if (rv != NS_ERROR_DOM_INDEX_SIZE_ERR) {
aRv.Throw(rv);
}
return;
}
if (data) {
nsAutoString stringdata;
data->GetAsAString(stringdata);
// for the URL type, parse out the first URI from the list. The URIs are
// separated by newlines
nsAutoString lowercaseFormat;
nsContentUtils::ASCIIToLower(aFormat, lowercaseFormat);
if (lowercaseFormat.EqualsLiteral("url")) {
int32_t lastidx = 0, idx;
int32_t length = stringdata.Length();
while (lastidx < length) {
idx = stringdata.FindChar('\n', lastidx);
// lines beginning with # are comments
if (stringdata[lastidx] == '#') {
if (idx == -1) {
break;
}
} else {
if (idx == -1) {
aData.Assign(Substring(stringdata, lastidx));
} else {
aData.Assign(Substring(stringdata, lastidx, idx - lastidx));
}
aData =
nsContentUtils::TrimWhitespace<nsCRT::IsAsciiSpace>(aData, true);
return;
}
lastidx = idx + 1;
}
} else {
aData = stringdata;
}
}
}
void DataTransfer::SetData(const nsAString& aFormat, const nsAString& aData,
nsIPrincipal& aSubjectPrincipal, ErrorResult& aRv) {
RefPtr<nsVariantCC> variant = new nsVariantCC();
variant->SetAsAString(aData);
aRv = SetDataAtInternal(aFormat, variant, 0, &aSubjectPrincipal);
}
void DataTransfer::ClearData(const Optional<nsAString>& aFormat,
nsIPrincipal& aSubjectPrincipal,
ErrorResult& aRv) {
if (IsReadOnly()) {
aRv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
return;
}
if (MozItemCount() == 0) {
return;
}
if (aFormat.WasPassed()) {
MozClearDataAtHelper(aFormat.Value(), 0, aSubjectPrincipal, aRv);
} else {
MozClearDataAtHelper(u""_ns, 0, aSubjectPrincipal, aRv);
}
}
void DataTransfer::SetMozCursor(const nsAString& aCursorState) {
// Lock the cursor to an arrow during the drag.
mCursorState = aCursorState.EqualsLiteral("default");
}
already_AddRefed<nsINode> DataTransfer::GetMozSourceNode() {
nsCOMPtr<nsIDragSession> dragSession = nsContentUtils::GetDragSession();
if (!dragSession) {
return nullptr;
}
nsCOMPtr<nsINode> sourceNode;
dragSession->GetSourceNode(getter_AddRefs(sourceNode));
if (sourceNode && !nsContentUtils::LegacyIsCallerNativeCode() &&
!nsContentUtils::CanCallerAccess(sourceNode)) {
return nullptr;
}
return sourceNode.forget();
}
already_AddRefed<WindowContext> DataTransfer::GetSourceTopWindowContext() {
nsCOMPtr<nsIDragSession> dragSession = nsContentUtils::GetDragSession();
if (!dragSession) {
return nullptr;
}
RefPtr<WindowContext> sourceTopWindowContext;
dragSession->GetSourceTopWindowContext(
getter_AddRefs(sourceTopWindowContext));
return sourceTopWindowContext.forget();
}
already_AddRefed<DOMStringList> DataTransfer::MozTypesAt(
uint32_t aIndex, ErrorResult& aRv) const {
// Only the first item is valid for clipboard events
if (aIndex > 0 && (mEventMessage == eCut || mEventMessage == eCopy ||
mEventMessage == ePaste)) {
aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return nullptr;
}
RefPtr<DOMStringList> types = new DOMStringList();
if (aIndex < MozItemCount()) {
// note that you can retrieve the types regardless of their principal
const nsTArray<RefPtr<DataTransferItem>>& items =
*mItems->MozItemsAt(aIndex);
bool addFile = false;
for (uint32_t i = 0; i < items.Length(); i++) {
// NOTE: The reason why we get the internal type here is because we want
// kFileMime to appear in the types list for backwards compatibility
// reasons.
nsAutoString type;
items[i]->GetInternalType(type);
if (NS_WARN_IF(!types->Add(type))) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
if (items[i]->Kind() == DataTransferItem::KIND_FILE) {
addFile = true;
}
}
if (addFile) {
types->Add(u"Files"_ns);
}
}
return types.forget();
}
nsresult DataTransfer::GetDataAtNoSecurityCheck(const nsAString& aFormat,
uint32_t aIndex,
nsIVariant** aData) const {
return GetDataAtInternal(aFormat, aIndex,
nsContentUtils::GetSystemPrincipal(), aData);
}
nsresult DataTransfer::GetDataAtInternal(const nsAString& aFormat,
uint32_t aIndex,
nsIPrincipal* aSubjectPrincipal,
nsIVariant** aData) const {
*aData = nullptr;
if (aFormat.IsEmpty()) {
return NS_OK;
}
if (aIndex >= MozItemCount()) {
return NS_ERROR_DOM_INDEX_SIZE_ERR;
}
// Only the first item is valid for clipboard events
if (aIndex > 0 && (mEventMessage == eCut || mEventMessage == eCopy ||
mEventMessage == ePaste)) {
return NS_ERROR_DOM_INDEX_SIZE_ERR;
}
nsAutoString format;
GetRealFormat(aFormat, format);
MOZ_ASSERT(aSubjectPrincipal);
RefPtr<DataTransferItem> item = mItems->MozItemByTypeAt(format, aIndex);
if (!item) {
// The index exists but there's no data for the specified format, in this
// case we just return undefined
return NS_OK;
}
// If we have chrome only content, and we aren't chrome, don't allow access
if (!aSubjectPrincipal->IsSystemPrincipal() && item->ChromeOnly()) {
return NS_OK;
}
// DataTransferItem::Data() handles the principal checks
ErrorResult result;
nsCOMPtr<nsIVariant> data = item->Data(aSubjectPrincipal, result);
if (NS_WARN_IF(!data || result.Failed())) {
return result.StealNSResult();
}
data.forget(aData);
return NS_OK;
}
void DataTransfer::MozGetDataAt(JSContext* aCx, const nsAString& aFormat,
uint32_t aIndex,
JS::MutableHandle<JS::Value> aRetval,
mozilla::ErrorResult& aRv) {
nsCOMPtr<nsIVariant> data;
aRv = GetDataAtInternal(aFormat, aIndex, nsContentUtils::GetSystemPrincipal(),
getter_AddRefs(data));
if (aRv.Failed()) {
return;
}
if (!data) {
aRetval.setNull();
return;
}
JS::Rooted<JS::Value> result(aCx);
if (!VariantToJsval(aCx, data, aRetval)) {
aRv = NS_ERROR_FAILURE;
return;
}
}
/* static */
bool DataTransfer::PrincipalMaySetData(const nsAString& aType,
nsIVariant* aData,
nsIPrincipal* aPrincipal) {
if (!aPrincipal->IsSystemPrincipal()) {
DataTransferItem::eKind kind = DataTransferItem::KindFromData(aData);
if (kind == DataTransferItem::KIND_OTHER) {
NS_WARNING("Disallowing adding non string/file types to DataTransfer");
return false;
}
// Don't allow adding internal types of the form */x-moz-*, but
// special-case the url types as they are simple variations of urls.
// In addition, allow x-moz-place flavors to be added by WebExtensions.
if (FindInReadable(kInternal_Mimetype_Prefix, aType) &&
!StringBeginsWith(aType, u"text/x-moz-url"_ns)) {
auto principal = BasePrincipal::Cast(aPrincipal);
if (!principal->AddonPolicy() ||
!StringBeginsWith(aType, u"text/x-moz-place"_ns)) {
NS_WARNING("Disallowing adding this type to DataTransfer");
return false;
}
}
}
return true;
}
void DataTransfer::TypesListMayHaveChanged() {
DataTransfer_Binding::ClearCachedTypesValue(this);
}
already_AddRefed<DataTransfer> DataTransfer::MozCloneForEvent(
const nsAString& aEvent, ErrorResult& aRv) {
RefPtr<nsAtom> atomEvt = NS_Atomize(aEvent);
if (!atomEvt) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return nullptr;
}
EventMessage eventMessage = nsContentUtils::GetEventMessage(atomEvt);
RefPtr<DataTransfer> dt;
nsresult rv = Clone(mParent, eventMessage, false, false, getter_AddRefs(dt));
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return nullptr;
}
return dt.forget();
}
// The order of the types matters. `kFileMime` needs to be one of the first two
// types. And the order should be the same as the types order defined in
// MandatoryDataTypesAsCStrings() for Clipboard API.
static const nsCString kNonPlainTextExternalFormats[] = {
nsLiteralCString(kCustomTypesMime), nsLiteralCString(kFileMime),
nsLiteralCString(kHTMLMime), nsLiteralCString(kRTFMime),
nsLiteralCString(kURLMime), nsLiteralCString(kURLDataMime),
nsLiteralCString(kTextMime), nsLiteralCString(kPNGImageMime),
nsLiteralCString(kPDFJSMime)};
void DataTransfer::GetExternalClipboardFormats(const bool& aPlainTextOnly,
nsTArray<nsCString>& aResult) {
// NOTE: When you change this method, you may need to change
// GetExternalTransferableFormats() too since those methods should
// work similarly.
MOZ_ASSERT(!mAsyncGetClipboardData);
RefPtr<WindowContext> wc = GetWindowContext();
if (NS_WARN_IF(!wc)) {
MOZ_ASSERT_UNREACHABLE(
"How could this DataTransfer be created with a non-window global?");
return;
}
nsCOMPtr<nsIClipboard> clipboard =
do_GetService("@mozilla.org/widget/clipboard;1");
if (!clipboard || mClipboardType < 0) {
return;
}
nsresult rv = NS_ERROR_FAILURE;
nsCOMPtr<nsIAsyncGetClipboardData> asyncGetClipboardData;
if (aPlainTextOnly) {
rv = clipboard->GetDataSnapshotSync(
AutoTArray<nsCString, 1>{nsLiteralCString(kTextMime)}, mClipboardType,
wc, getter_AddRefs(asyncGetClipboardData));
} else {
AutoTArray<nsCString, ArrayLength(kNonPlainTextExternalFormats)> formats;
formats.AppendElements(Span<const nsCString>(kNonPlainTextExternalFormats));
rv = clipboard->GetDataSnapshotSync(formats, mClipboardType, wc,
getter_AddRefs(asyncGetClipboardData));
}
if (NS_FAILED(rv) || !asyncGetClipboardData) {
return;
}
// Order is important for DataTransfer; ensure the returned list items follow
// the sequence specified in kNonPlainTextExternalFormats.
AutoTArray<nsCString, ArrayLength(kNonPlainTextExternalFormats)> flavors;
asyncGetClipboardData->GetFlavorList(flavors);
for (const auto& format : kNonPlainTextExternalFormats) {
if (flavors.Contains(format)) {
aResult.AppendElement(format);
}
}
mAsyncGetClipboardData = asyncGetClipboardData;
}
/* static */
void DataTransfer::GetExternalTransferableFormats(
nsITransferable* aTransferable, bool aPlainTextOnly,
nsTArray<nsCString>* aResult) {
MOZ_ASSERT(aTransferable);
MOZ_ASSERT(aResult);
aResult->Clear();
// NOTE: When you change this method, you may need to change
// GetExternalClipboardFormats() too since those methods should
// work similarly.
AutoTArray<nsCString, 10> flavors;
aTransferable->FlavorsTransferableCanExport(flavors);
if (aPlainTextOnly) {
auto index = flavors.IndexOf(nsLiteralCString(kTextMime));
if (index != flavors.NoIndex) {
aResult->AppendElement(nsLiteralCString(kTextMime));
}
return;
}
// If not plain text only, then instead check all the other types
for (const auto& format : kNonPlainTextExternalFormats) {
auto index = flavors.IndexOf(format);
if (index != flavors.NoIndex) {
aResult->AppendElement(format);
}
}
}
nsresult DataTransfer::SetDataAtInternal(const nsAString& aFormat,
nsIVariant* aData, uint32_t aIndex,
nsIPrincipal* aSubjectPrincipal) {
if (aFormat.IsEmpty()) {
return NS_OK;
}
if (IsReadOnly()) {
return NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR;
}
// Specifying an index less than the current length will replace an existing
// item. Specifying an index equal to the current length will add a new item.
if (aIndex > MozItemCount()) {
return NS_ERROR_DOM_INDEX_SIZE_ERR;
}
// Only the first item is valid for clipboard events
if (aIndex > 0 && (mEventMessage == eCut || mEventMessage == eCopy ||
mEventMessage == ePaste)) {
return NS_ERROR_DOM_INDEX_SIZE_ERR;
}
// Don't allow the custom type to be assigned.
if (aFormat.EqualsLiteral(kCustomTypesMime)) {
return NS_ERROR_DOM_NOT_SUPPORTED_ERR;
}
if (!PrincipalMaySetData(aFormat, aData, aSubjectPrincipal)) {
return NS_ERROR_DOM_SECURITY_ERR;
}
return SetDataWithPrincipal(aFormat, aData, aIndex, aSubjectPrincipal);
}
void DataTransfer::MozSetDataAt(JSContext* aCx, const nsAString& aFormat,
JS::Handle<JS::Value> aData, uint32_t aIndex,
ErrorResult& aRv) {
nsCOMPtr<nsIVariant> data;
aRv = nsContentUtils::XPConnect()->JSValToVariant(aCx, aData,
getter_AddRefs(data));
if (!aRv.Failed()) {
aRv = SetDataAtInternal(aFormat, data, aIndex,
nsContentUtils::GetSystemPrincipal());
}
}
void DataTransfer::MozClearDataAt(const nsAString& aFormat, uint32_t aIndex,
ErrorResult& aRv) {
if (IsReadOnly()) {
aRv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
return;
}
if (aIndex >= MozItemCount()) {
aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return;
}
// Only the first item is valid for clipboard events
if (aIndex > 0 && (mEventMessage == eCut || mEventMessage == eCopy ||
mEventMessage == ePaste)) {
aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return;
}
MozClearDataAtHelper(aFormat, aIndex, *nsContentUtils::GetSystemPrincipal(),
aRv);
// If we just cleared the 0-th index, and there are still more than 1 indexes
// remaining, MozClearDataAt should cause the 1st index to become the 0th
// index. This should _only_ happen when the MozClearDataAt function is
// explicitly called by script, as this behavior is inconsistent with spec.
// (however, so is the MozClearDataAt API)
if (aIndex == 0 && mItems->MozItemCount() > 1 &&
mItems->MozItemsAt(0)->Length() == 0) {
mItems->PopIndexZero();
}
}
void DataTransfer::MozClearDataAtHelper(const nsAString& aFormat,
uint32_t aIndex,
nsIPrincipal& aSubjectPrincipal,
ErrorResult& aRv) {
MOZ_ASSERT(!IsReadOnly());
MOZ_ASSERT(aIndex < MozItemCount());
MOZ_ASSERT(aIndex == 0 || (mEventMessage != eCut && mEventMessage != eCopy &&
mEventMessage != ePaste));
nsAutoString format;
GetRealFormat(aFormat, format);
mItems->MozRemoveByTypeAt(format, aIndex, aSubjectPrincipal, aRv);
}
void DataTransfer::SetDragImage(Element& aImage, int32_t aX, int32_t aY) {
if (!IsReadOnly()) {
mDragImage = &aImage;
mDragImageX = aX;
mDragImageY = aY;
}
}
void DataTransfer::UpdateDragImage(Element& aImage, int32_t aX, int32_t aY) {
if (mEventMessage < eDragDropEventFirst ||
mEventMessage > eDragDropEventLast) {
return;
}
nsCOMPtr<nsIDragSession> dragSession = nsContentUtils::GetDragSession();
if (dragSession) {
dragSession->UpdateDragImage(&aImage, aX, aY);
}
}
void DataTransfer::AddElement(Element& aElement, ErrorResult& aRv) {
if (IsReadOnly()) {
aRv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
return;
}
mDragTarget = &aElement;
}
nsresult DataTransfer::Clone(nsISupports* aParent, EventMessage aEventMessage,
bool aUserCancelled,
bool aIsCrossDomainSubFrameDrop,
DataTransfer** aNewDataTransfer) {
RefPtr<DataTransfer> newDataTransfer = new DataTransfer(
aParent, aEventMessage, mEffectAllowed, mCursorState, mIsExternal,
aUserCancelled, aIsCrossDomainSubFrameDrop, mClipboardType, mItems,
mDragImage, mDragImageX, mDragImageY, mShowFailAnimation);
newDataTransfer.forget(aNewDataTransfer);
return NS_OK;
}
already_AddRefed<nsIArray> DataTransfer::GetTransferables(
nsINode* aDragTarget) {
MOZ_ASSERT(aDragTarget);
Document* doc = aDragTarget->GetComposedDoc();
if (!doc) {
return nullptr;
}
return GetTransferables(doc->GetLoadContext());
}
already_AddRefed<nsIArray> DataTransfer::GetTransferables(
nsILoadContext* aLoadContext) {
nsCOMPtr<nsIMutableArray> transArray = nsArray::Create();
if (!transArray) {
return nullptr;
}
uint32_t count = MozItemCount();
for (uint32_t i = 0; i < count; i++) {
nsCOMPtr<nsITransferable> transferable = GetTransferable(i, aLoadContext);
if (transferable) {
transArray->AppendElement(transferable);
}
}
return transArray.forget();
}
already_AddRefed<nsITransferable> DataTransfer::GetTransferable(
uint32_t aIndex, nsILoadContext* aLoadContext) {
if (aIndex >= MozItemCount()) {
return nullptr;
}
const nsTArray<RefPtr<DataTransferItem>>& item = *mItems->MozItemsAt(aIndex);
uint32_t count = item.Length();
if (!count) {
return nullptr;
}
nsCOMPtr<nsITransferable> transferable =
do_CreateInstance("@mozilla.org/widget/transferable;1");
if (!transferable) {
return nullptr;
}
transferable->Init(aLoadContext);
// Set the principal of the global this DataTransfer was created for
// on the transferable for ReadWrite events (copy, cut, or dragstart).
//
// For other events, the data inside the transferable may originate
// from another origin or from the OS.
if (mMode == Mode::ReadWrite) {
if (nsCOMPtr<nsIGlobalObject> global = GetGlobal()) {
transferable->SetDataPrincipal(global->PrincipalOrNull());
}
}
nsCOMPtr<nsIStorageStream> storageStream;
nsCOMPtr<nsIObjectOutputStream> stream;
bool added = false;
bool handlingCustomFormats = true;
// When writing the custom data, we need to ensure that there is sufficient
// space for a (uint32_t) data ending type, and the null byte character at
// the end of the nsCString. We claim that space upfront and store it in
// baseLength. This value will be set to zero if a write error occurs
// indicating that the data and length are no longer valid.
const uint32_t baseLength = sizeof(uint32_t) + 1;
uint32_t totalCustomLength = baseLength;
/*
* Two passes are made here to iterate over all of the types. First, look for
* any types that are not in the list of known types. For this pass,
* handlingCustomFormats will be true. Data that corresponds to unknown types
* will be pulled out and inserted into a single type (kCustomTypesMime) by
* writing the data into a stream.
*
* The second pass will iterate over the formats looking for known types.
* These are added as is. The unknown types are all then inserted as a single
* type (kCustomTypesMime) in the same position of the first custom type. This
* model is used to maintain the format order as best as possible.
*
* The format of the kCustomTypesMime type is one or more of the following
* stored sequentially:
* <32-bit> type (only none or string is supported)
* <32-bit> length of format
* <wide string> format
* <32-bit> length of data
* <wide string> data
* A type of eCustomClipboardTypeId_None ends the list, without any following
* data.
*/
do {
for (uint32_t f = 0; f < count; f++) {
RefPtr<DataTransferItem> formatitem = item[f];
nsCOMPtr<nsIVariant> variant = formatitem->DataNoSecurityCheck();
if (!variant) { // skip empty items
continue;
}
nsAutoString type;
formatitem->GetInternalType(type);
// If the data is of one of the well-known formats, use it directly.
bool isCustomFormat = true;
for (const char* format : kKnownFormats) {
if (type.EqualsASCII(format)) {
isCustomFormat = false;
break;
}
}
uint32_t lengthInBytes;
nsCOMPtr<nsISupports> convertedData;
if (handlingCustomFormats) {
if (!ConvertFromVariant(variant, getter_AddRefs(convertedData),
&lengthInBytes)) {
continue;
}
// When handling custom types, add the data to the stream if this is a
// custom type. If totalCustomLength is 0, then a write error occurred
// on a previous item, so ignore any others.
if (isCustomFormat && totalCustomLength > 0) {
// If it isn't a string, just ignore it. The dataTransfer is cached in
// the drag sesion during drag-and-drop, so non-strings will be
// available when dragging locally.
nsCOMPtr<nsISupportsString> str(do_QueryInterface(convertedData));
if (str) {
nsAutoString data;
str->GetData(data);
if (!stream) {
// Create a storage stream to write to.
NS_NewStorageStream(1024, UINT32_MAX,
getter_AddRefs(storageStream));
nsCOMPtr<nsIOutputStream> outputStream;
storageStream->GetOutputStream(0, getter_AddRefs(outputStream));
stream = NS_NewObjectOutputStream(outputStream);
}
CheckedInt<uint32_t> formatLength =
CheckedInt<uint32_t>(type.Length()) *
sizeof(nsString::char_type);
// The total size of the stream is the format length, the data
// length, two integers to hold the lengths and one integer for
// the string flag. Guard against large data by ignoring any that
// don't fit.
CheckedInt<uint32_t> newSize = formatLength + totalCustomLength +
lengthInBytes +
(sizeof(uint32_t) * 3);
if (newSize.isValid()) {
// If a write error occurs, set totalCustomLength to 0 so that
// further processing gets ignored.
nsresult rv = stream->Write32(eCustomClipboardTypeId_String);
if (NS_WARN_IF(NS_FAILED(rv))) {
totalCustomLength = 0;
continue;
}
rv = stream->Write32(formatLength.value());
if (NS_WARN_IF(NS_FAILED(rv))) {
totalCustomLength = 0;
continue;
}
MOZ_ASSERT(formatLength.isValid() &&
formatLength.value() ==
type.Length() * sizeof(nsString::char_type),
"Why is formatLength off?");
rv = stream->WriteBytes(
AsBytes(Span(type.BeginReading(), type.Length())));
if (NS_WARN_IF(NS_FAILED(rv))) {
totalCustomLength = 0;
continue;
}
rv = stream->Write32(lengthInBytes);
if (NS_WARN_IF(NS_FAILED(rv))) {
totalCustomLength = 0;
continue;
}
// XXXbz it's not obvious to me that lengthInBytes is the actual
// length of "data" if the variant contained an nsISupportsString
// as VTYPE_INTERFACE, say. We used lengthInBytes above for
// sizing, so just keep doing that.
rv = stream->WriteBytes(
Span(reinterpret_cast<const uint8_t*>(data.BeginReading()),
lengthInBytes));
if (NS_WARN_IF(NS_FAILED(rv))) {
totalCustomLength = 0;
continue;
}
totalCustomLength = newSize.value();
}
}
}
} else if (isCustomFormat && stream) {
// This is the second pass of the loop (handlingCustomFormats is false).
// When encountering the first custom format, append all of the stream
// at this position. If totalCustomLength is 0 indicating a write error
// occurred, or no data has been added to it, don't output anything,
if (totalCustomLength > baseLength) {
// Write out an end of data terminator.
nsresult rv = stream->Write32(eCustomClipboardTypeId_None);
if (NS_SUCCEEDED(rv)) {
nsCOMPtr<nsIInputStream> inputStream;
storageStream->NewInputStream(0, getter_AddRefs(inputStream));
RefPtr<nsStringBuffer> stringBuffer =
nsStringBuffer::Alloc(totalCustomLength);
// Subtract off the null terminator when reading.
totalCustomLength--;
// Read the data from the stream and add a null-terminator as
// ToString needs it.
uint32_t amountRead;
rv = inputStream->Read(static_cast<char*>(stringBuffer->Data()),
totalCustomLength, &amountRead);
if (NS_SUCCEEDED(rv)) {
static_cast<char*>(stringBuffer->Data())[amountRead] = 0;
nsCString str;
stringBuffer->ToString(totalCustomLength, str);
nsCOMPtr<nsISupportsCString> strSupports(
do_CreateInstance(NS_SUPPORTS_CSTRING_CONTRACTID));
strSupports->SetData(str);
nsresult rv =
transferable->SetTransferData(kCustomTypesMime, strSupports);
if (NS_FAILED(rv)) {
return nullptr;
}
added = true;
}
}
}
// Clear the stream so it doesn't get used again.
stream = nullptr;
} else {
// This is the second pass of the loop and a known type is encountered.
// Add it as is.
if (!ConvertFromVariant(variant, getter_AddRefs(convertedData),
&lengthInBytes)) {
continue;
}
NS_ConvertUTF16toUTF8 format(type);
// If a converter is set for a format, set the converter for the
// transferable and don't add the item
nsCOMPtr<nsIFormatConverter> converter =
do_QueryInterface(convertedData);
if (converter) {
transferable->AddDataFlavor(format.get());
transferable->SetConverter(converter);
continue;
}
nsresult rv =
transferable->SetTransferData(format.get(), convertedData);
if (NS_FAILED(rv)) {
return nullptr;
}
added = true;
}
}
handlingCustomFormats = !handlingCustomFormats;
} while (!handlingCustomFormats);
// only return the transferable if data was successfully added to it
if (added) {
return transferable.forget();
}
return nullptr;
}
bool DataTransfer::ConvertFromVariant(nsIVariant* aVariant,
nsISupports** aSupports,
uint32_t* aLength) const {
*aSupports = nullptr;
*aLength = 0;
uint16_t type = aVariant->GetDataType();
if (type == nsIDataType::VTYPE_INTERFACE ||
type == nsIDataType::VTYPE_INTERFACE_IS) {
nsCOMPtr<nsISupports> data;
if (NS_FAILED(aVariant->GetAsISupports(getter_AddRefs(data)))) {
return false;
}
// For flavour data providers, use 0 as the length.
if (nsCOMPtr<nsIFlavorDataProvider> fdp = do_QueryInterface(data)) {
fdp.forget(aSupports);
*aLength = 0;
return true;
}
// Only use the underlying BlobImpl for transferables.
if (RefPtr<Blob> blob = do_QueryObject(data)) {
RefPtr<BlobImpl> blobImpl = blob->Impl();
blobImpl.forget(aSupports);
} else {
data.forget(aSupports);
}
*aLength = sizeof(nsISupports*);
return true;
}
nsAutoString str;
nsresult rv = aVariant->GetAsAString(str);
if (NS_FAILED(rv)) {
return false;
}
nsCOMPtr<nsISupportsString> strSupports(
do_CreateInstance(NS_SUPPORTS_STRING_CONTRACTID));
if (!strSupports) {
return false;
}
strSupports->SetData(str);
strSupports.forget(aSupports);
// each character is two bytes
*aLength = str.Length() * 2;
return true;
}
void DataTransfer::Disconnect() {
SetMode(Mode::Protected);
if (StaticPrefs::dom_events_dataTransfer_protected_enabled()) {
ClearAll();
}
}
void DataTransfer::ClearAll() {
mItems->ClearAllItems();
mAsyncGetClipboardData = nullptr;
}
uint32_t DataTransfer::MozItemCount() const { return mItems->MozItemCount(); }
nsresult DataTransfer::SetDataWithPrincipal(const nsAString& aFormat,
nsIVariant* aData, uint32_t aIndex,
nsIPrincipal* aPrincipal,
bool aHidden) {
nsAutoString format;
GetRealFormat(aFormat, format);
ErrorResult rv;
RefPtr<DataTransferItem> item =
mItems->SetDataWithPrincipal(format, aData, aIndex, aPrincipal,
/* aInsertOnly = */ false, aHidden, rv);
return rv.StealNSResult();
}
void DataTransfer::SetDataWithPrincipalFromOtherProcess(
const nsAString& aFormat, nsIVariant* aData, uint32_t aIndex,
nsIPrincipal* aPrincipal, bool aHidden) {
if (aFormat.EqualsLiteral(kCustomTypesMime)) {
FillInExternalCustomTypes(aData, aIndex, aPrincipal);
} else {
nsAutoString format;
GetRealFormat(aFormat, format);
ErrorResult rv;
RefPtr<DataTransferItem> item =
mItems->SetDataWithPrincipal(format, aData, aIndex, aPrincipal,
/* aInsertOnly = */ false, aHidden, rv);
if (NS_WARN_IF(rv.Failed())) {
rv.SuppressException();
}
}
}
void DataTransfer::GetRealFormat(const nsAString& aInFormat,
nsAString& aOutFormat) const {
// For compatibility, treat text/unicode as equivalent to text/plain
nsAutoString lowercaseFormat;
nsContentUtils::ASCIIToLower(aInFormat, lowercaseFormat);
if (lowercaseFormat.EqualsLiteral("text") ||
lowercaseFormat.EqualsLiteral("text/unicode")) {
aOutFormat.AssignLiteral("text/plain");
return;
}
if (lowercaseFormat.EqualsLiteral("url")) {
aOutFormat.AssignLiteral("text/uri-list");
return;
}
aOutFormat.Assign(lowercaseFormat);
}
already_AddRefed<nsIGlobalObject> DataTransfer::GetGlobal() const {
nsCOMPtr<nsIGlobalObject> global;
// This is annoying, but DataTransfer may have various things as parent.
if (nsCOMPtr<EventTarget> target = do_QueryInterface(mParent)) {
global = target->GetOwnerGlobal();
} else if (RefPtr<Event> event = do_QueryObject(mParent)) {
global = event->GetParentObject();
}
return global.forget();
}
already_AddRefed<WindowContext> DataTransfer::GetWindowContext() const {
nsCOMPtr<nsIGlobalObject> global = GetGlobal();
if (!global) {
return nullptr;
}
const auto* innerWindow = global->GetAsInnerWindow();
if (!innerWindow) {
return nullptr;
}
return do_AddRef(innerWindow->GetWindowContext());
}
nsIAsyncGetClipboardData* DataTransfer::GetAsyncGetClipboardData() const {
return mAsyncGetClipboardData;
}
nsresult DataTransfer::CacheExternalData(const char* aFormat, uint32_t aIndex,
nsIPrincipal* aPrincipal,
bool aHidden) {
ErrorResult rv;
RefPtr<DataTransferItem> item;
if (strcmp(aFormat, kTextMime) == 0) {
item = mItems->SetDataWithPrincipal(u"text/plain"_ns, nullptr, aIndex,
aPrincipal, false, aHidden, rv);
if (NS_WARN_IF(rv.Failed())) {
return rv.StealNSResult();
}
return NS_OK;
}
if (strcmp(aFormat, kURLDataMime) == 0) {
item = mItems->SetDataWithPrincipal(u"text/uri-list"_ns, nullptr, aIndex,
aPrincipal, false, aHidden, rv);
if (NS_WARN_IF(rv.Failed())) {
return rv.StealNSResult();
}
return NS_OK;
}
nsAutoString format;
GetRealFormat(NS_ConvertUTF8toUTF16(aFormat), format);
item = mItems->SetDataWithPrincipal(format, nullptr, aIndex, aPrincipal,
false, aHidden, rv);
if (NS_WARN_IF(rv.Failed())) {
return rv.StealNSResult();
}
return NS_OK;
}
void DataTransfer::CacheExternalDragFormats() {
// Called during the constructor to cache the formats available from an
// external drag. The data associated with each format will be set to null.
// This data will instead only be retrieved in FillInExternalDragData when
// asked for, as it may be time consuming for the source application to
// generate it.
nsCOMPtr<nsIDragSession> dragSession = nsContentUtils::GetDragSession();
if (!dragSession) {
return;
}
// make sure that the system principal is used for external drags
nsIScriptSecurityManager* ssm = nsContentUtils::GetSecurityManager();
nsCOMPtr<nsIPrincipal> sysPrincipal;
ssm->GetSystemPrincipal(getter_AddRefs(sysPrincipal));
// there isn't a way to get a list of the formats that might be available on
// all platforms, so just check for the types that can actually be imported
// XXXndeakin there are some other formats but those are platform specific.
// NOTE: kFileMime must have index 0
// TODO: should this be `kNonPlainTextExternalFormats` instead?
static const char* formats[] = {kFileMime, kHTMLMime, kURLMime,
kURLDataMime, kTextMime, kPNGImageMime};
uint32_t count;
dragSession->GetNumDropItems(&count);
for (uint32_t c = 0; c < count; c++) {
bool hasFileData = false;
dragSession->IsDataFlavorSupported(kFileMime, &hasFileData);
// First, check for the special format that holds custom types.
bool supported;
dragSession->IsDataFlavorSupported(kCustomTypesMime, &supported);
if (supported) {
FillInExternalCustomTypes(c, sysPrincipal);
}
for (uint32_t f = 0; f < ArrayLength(formats); f++) {
// IsDataFlavorSupported doesn't take an index as an argument and just
// checks if any of the items support a particular flavor, even though
// the GetData method does take an index. Here, we just assume that
// every item being dragged has the same set of flavors.
bool supported;
dragSession->IsDataFlavorSupported(formats[f], &supported);
// if the format is supported, add an item to the array with null as
// the data. When retrieved, GetRealData will read the data.
if (supported) {
CacheExternalData(formats[f], c, sysPrincipal,
/* hidden = */ f && hasFileData);
}
}
}
}
void DataTransfer::CacheExternalClipboardFormats(bool aPlainTextOnly) {
// Called during the constructor for paste events to cache the formats
// available on the clipboard. As with CacheExternalDragFormats, the
// data will only be retrieved when needed.
NS_ASSERTION(mEventMessage == ePaste,
"caching clipboard data for invalid event");
nsCOMPtr<nsIPrincipal> sysPrincipal = nsContentUtils::GetSystemPrincipal();
nsTArray<nsCString> typesArray;
GetExternalClipboardFormats(aPlainTextOnly, typesArray);
if (aPlainTextOnly) {
// The only thing that will be in types is kTextMime
MOZ_ASSERT(typesArray.IsEmpty() || typesArray.Length() == 1);
if (typesArray.Length() == 1) {
MOZ_ASSERT(typesArray.Contains(kTextMime));
CacheExternalData(kTextMime, 0, sysPrincipal, false);
}
return;
}
CacheExternalData(typesArray, sysPrincipal);
}
void DataTransfer::CacheTransferableFormats() {
nsCOMPtr<nsIPrincipal> sysPrincipal = nsContentUtils::GetSystemPrincipal();
AutoTArray<nsCString, 10> typesArray;
GetExternalTransferableFormats(mTransferable, false, &typesArray);
CacheExternalData(typesArray, sysPrincipal);
}
void DataTransfer::CacheExternalData(const nsTArray<nsCString>& aTypes,
nsIPrincipal* aPrincipal) {
bool hasFileData = false;
for (const nsCString& type : aTypes) {
if (type.EqualsLiteral(kCustomTypesMime)) {
FillInExternalCustomTypes(0, aPrincipal);
} else if (type.EqualsLiteral(kFileMime) && XRE_IsContentProcess() &&
!StaticPrefs::dom_events_dataTransfer_mozFile_enabled()) {
// We will be ignoring any application/x-moz-file files found in the paste
// datatransfer within e10s, as they will fail top be sent over IPC.
// Because of that, we will unset hasFileData, whether or not it would
hasFileData = false;
continue;
} else {
// We expect that if kFileMime is supported, then it will be the either at
// index 0 or at index 1 in the aTypes returned by
// GetExternalClipboardFormats
if (type.EqualsLiteral(kFileMime)) {
hasFileData = true;
}
// If we aren't the file data, and we have file data, we want to be hidden
CacheExternalData(
type.get(), 0, aPrincipal,
/* hidden = */ !type.EqualsLiteral(kFileMime) && hasFileData);
}
}
}
void DataTransfer::FillAllExternalData() {
if (mIsExternal) {
for (uint32_t i = 0; i < MozItemCount(); ++i) {
const nsTArray<RefPtr<DataTransferItem>>& items = *mItems->MozItemsAt(i);
for (uint32_t j = 0; j < items.Length(); ++j) {
MOZ_ASSERT(items[j]->Index() == i);
items[j]->FillInExternalData();
}
}
}
}
void DataTransfer::FillInExternalCustomTypes(uint32_t aIndex,
nsIPrincipal* aPrincipal) {
RefPtr<DataTransferItem> item = new DataTransferItem(
this, NS_LITERAL_STRING_FROM_CSTRING(kCustomTypesMime),
DataTransferItem::KIND_STRING);
item->SetIndex(aIndex);
nsCOMPtr<nsIVariant> variant = item->DataNoSecurityCheck();
if (!variant) {
return;
}
FillInExternalCustomTypes(variant, aIndex, aPrincipal);
}
void DataTransfer::FillInExternalCustomTypes(nsIVariant* aData, uint32_t aIndex,
nsIPrincipal* aPrincipal) {
char* chrs;
uint32_t len = 0;
nsresult rv = aData->GetAsStringWithSize(&len, &chrs);
if (NS_FAILED(rv)) {
return;
}
CheckedInt<int32_t> checkedLen(len);
if (!checkedLen.isValid()) {
return;
}
nsCOMPtr<nsIInputStream> stringStream;
NS_NewByteInputStream(getter_AddRefs(stringStream),
Span(chrs, checkedLen.value()), NS_ASSIGNMENT_ADOPT);
nsCOMPtr<nsIObjectInputStream> stream = NS_NewObjectInputStream(stringStream);
uint32_t type;
do {
rv = stream->Read32(&type);
NS_ENSURE_SUCCESS_VOID(rv);
if (type == eCustomClipboardTypeId_String) {
uint32_t formatLength;
rv = stream->Read32(&formatLength);
NS_ENSURE_SUCCESS_VOID(rv);
char* formatBytes;
rv = stream->ReadBytes(formatLength, &formatBytes);
NS_ENSURE_SUCCESS_VOID(rv);
nsAutoString format;
format.Adopt(reinterpret_cast<char16_t*>(formatBytes),
formatLength / sizeof(char16_t));
uint32_t dataLength;
rv = stream->Read32(&dataLength);
NS_ENSURE_SUCCESS_VOID(rv);
char* dataBytes;
rv = stream->ReadBytes(dataLength, &dataBytes);
NS_ENSURE_SUCCESS_VOID(rv);
nsAutoString data;
data.Adopt(reinterpret_cast<char16_t*>(dataBytes),
dataLength / sizeof(char16_t));
RefPtr<nsVariantCC> variant = new nsVariantCC();
rv = variant->SetAsAString(data);
NS_ENSURE_SUCCESS_VOID(rv);
SetDataWithPrincipal(format, variant, aIndex, aPrincipal);
}
} while (type != eCustomClipboardTypeId_None);
}
void DataTransfer::SetMode(DataTransfer::Mode aMode) {
if (!StaticPrefs::dom_events_dataTransfer_protected_enabled() &&
aMode == Mode::Protected) {
mMode = Mode::ReadOnly;
} else {
mMode = aMode;
}
}
} // namespace mozilla::dom