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gecko-dev/dom/events/DataTransfer.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/ArrayUtils.h"
#include "mozilla/BasicEvents.h"
#include "DataTransfer.h"
#include "nsIDOMDocument.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 "nsContentUtils.h"
#include "nsIContent.h"
#include "nsIBinaryInputStream.h"
#include "nsIBinaryOutputStream.h"
#include "nsIStorageStream.h"
#include "nsStringStream.h"
#include "nsCRT.h"
#include "nsIScriptObjectPrincipal.h"
#include "nsIScriptContext.h"
#include "nsIDocument.h"
#include "nsIScriptGlobalObject.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/FileList.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/OSFileSystem.h"
#include "mozilla/dom/Promise.h"
#include "nsNetUtil.h"
namespace mozilla {
namespace dom {
NS_IMPL_CYCLE_COLLECTION_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_COLLECTION_TRACE_WRAPPERCACHE(DataTransfer)
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(nsIDOMDataTransfer)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIDOMDataTransfer)
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
};
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)
, mReadOnly(true)
, mIsExternal(aIsExternal)
, mUserCancelled(false)
, mIsCrossDomainSubFrameDrop(false)
, mClipboardType(aClipboardType)
, mDragImageX(0)
, mDragImageY(0)
{
mItems = new DataTransferItemList(this, aIsExternal);
// For these events, we want to be able to add data to the data transfer, so
// clear the readonly state. Otherwise, the data is already present. For
// external usage, cache the data from the native clipboard or drag.
if (aEventMessage == eCut ||
aEventMessage == eCopy ||
aEventMessage == eDragStart) {
mReadOnly = false;
} else if (mIsExternal) {
if (aEventMessage == ePaste) {
CacheExternalClipboardFormats();
} else if (aEventMessage >= eDragDropEventFirst &&
aEventMessage <= eDragDropEventLast) {
CacheExternalDragFormats();
}
}
}
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)
: mParent(aParent)
, mDropEffect(nsIDragService::DRAGDROP_ACTION_NONE)
, mEffectAllowed(aEffectAllowed)
, mEventMessage(aEventMessage)
, mCursorState(aCursorState)
, mReadOnly(true)
, mIsExternal(aIsExternal)
, mUserCancelled(aUserCancelled)
, mIsCrossDomainSubFrameDrop(aIsCrossDomainSubFrameDrop)
, mClipboardType(aClipboardType)
, mDragImage(aDragImage)
, mDragImageX(aDragImageX)
, mDragImageY(aDragImageY)
{
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()
{}
// static
already_AddRefed<DataTransfer>
DataTransfer::Constructor(const GlobalObject& aGlobal,
const nsAString& aEventType, bool aIsExternal,
ErrorResult& aRv)
{
nsAutoCString onEventType("on");
AppendUTF16toUTF8(aEventType, onEventType);
nsCOMPtr<nsIAtom> eventTypeAtom = NS_Atomize(onEventType);
if (!eventTypeAtom) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return nullptr;
}
EventMessage eventMessage = nsContentUtils::GetEventMessage(eventTypeAtom);
RefPtr<DataTransfer> transfer = new DataTransfer(aGlobal.GetAsSupports(),
eventMessage, aIsExternal,
-1);
return transfer.forget();
}
JSObject*
DataTransfer::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
return DataTransferBinding::Wrap(aCx, this, aGivenProto);
}
NS_IMETHODIMP
DataTransfer::GetDropEffect(nsAString& aDropEffect)
{
nsString dropEffect;
GetDropEffect(dropEffect);
aDropEffect = dropEffect;
return NS_OK;
}
NS_IMETHODIMP
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;
}
}
return NS_OK;
}
NS_IMETHODIMP
DataTransfer::GetEffectAllowed(nsAString& aEffectAllowed)
{
nsString effectAllowed;
GetEffectAllowed(effectAllowed);
aEffectAllowed = effectAllowed;
return NS_OK;
}
NS_IMETHODIMP
DataTransfer::SetEffectAllowed(const nsAString& aEffectAllowed)
{
if (aEffectAllowed.EqualsLiteral("uninitialized")) {
mEffectAllowed = nsIDragService::DRAGDROP_ACTION_UNINITIALIZED;
return NS_OK;
}
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;
}
}
return NS_OK;
}
NS_IMETHODIMP
DataTransfer::GetDropEffectInt(uint32_t* aDropEffect)
{
*aDropEffect = mDropEffect;
return NS_OK;
}
NS_IMETHODIMP
DataTransfer::SetDropEffectInt(uint32_t aDropEffect)
{
mDropEffect = aDropEffect;
return NS_OK;
}
NS_IMETHODIMP
DataTransfer::GetEffectAllowedInt(uint32_t* aEffectAllowed)
{
*aEffectAllowed = mEffectAllowed;
return NS_OK;
}
NS_IMETHODIMP
DataTransfer::SetEffectAllowedInt(uint32_t aEffectAllowed)
{
mEffectAllowed = aEffectAllowed;
return NS_OK;
}
NS_IMETHODIMP
DataTransfer::GetMozUserCancelled(bool* aUserCancelled)
{
*aUserCancelled = MozUserCancelled();
return NS_OK;
}
already_AddRefed<FileList>
DataTransfer::GetFiles(nsIPrincipal& aSubjectPrincipal,
ErrorResult& aRv)
{
return mItems->Files(&aSubjectPrincipal);
}
NS_IMETHODIMP
DataTransfer::GetFiles(nsIDOMFileList** aFileList)
{
if (!aFileList) {
return NS_ERROR_FAILURE;
}
// The XPCOM interface is only avaliable to system code, and thus we can
// assume the system principal. This is consistent with the previous behavour
// of this function, which also assumed the system principal.
//
// This code is also called from C++ code, which expects it to have a System
// Principal, and thus the SubjectPrincipal cannot be used.
RefPtr<FileList> files = mItems->Files(nsContentUtils::GetSystemPrincipal());
files.forget(aFileList);
return NS_OK;
}
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();
const nsTArray<RefPtr<DataTransferItem>>* items = mItems->MozItemsAt(0);
if (NS_WARN_IF(!items)) {
return;
}
for (uint32_t i = 0; i < items->Length(); i++) {
DataTransferItem* item = items->ElementAt(i);
MOZ_ASSERT(item);
if (item->ChromeOnly() && aCallerType != CallerType::System) {
continue;
}
nsAutoString type;
item->GetType(type);
if (item->Kind() == DataTransferItem::KIND_STRING || type.EqualsASCII(kFileMime)) {
// If the entry has kind KIND_STRING, we want to add it to the list.
aTypes.AppendElement(type);
}
}
for (uint32_t i = 0; i < mItems->Length(); ++i) {
bool found = false;
DataTransferItem* item = mItems->IndexedGetter(i, found);
MOZ_ASSERT(found);
if (item->Kind() != DataTransferItem::KIND_FILE) {
continue;
}
aTypes.AppendElement(NS_LITERAL_STRING("Files"));
break;
}
}
void
DataTransfer::GetData(const nsAString& aFormat, nsAString& aData,
nsIPrincipal& aSubjectPrincipal,
ErrorResult& aRv)
{
// 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 (mReadOnly) {
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(EmptyString(), 0, aSubjectPrincipal, aRv);
}
}
NS_IMETHODIMP
DataTransfer::GetMozItemCount(uint32_t* aCount)
{
*aCount = MozItemCount();
return NS_OK;
}
NS_IMETHODIMP
DataTransfer::GetMozCursor(nsAString& aCursorState)
{
nsString cursor;
GetMozCursor(cursor);
aCursorState = cursor;
return NS_OK;
}
NS_IMETHODIMP
DataTransfer::SetMozCursor(const nsAString& aCursorState)
{
// Lock the cursor to an arrow during the drag.
mCursorState = aCursorState.EqualsLiteral("default");
return NS_OK;
}
already_AddRefed<nsINode>
DataTransfer::GetMozSourceNode()
{
nsCOMPtr<nsIDragSession> dragSession = nsContentUtils::GetDragSession();
if (!dragSession) {
return nullptr;
}
nsCOMPtr<nsIDOMNode> sourceNode;
dragSession->GetSourceNode(getter_AddRefs(sourceNode));
nsCOMPtr<nsINode> node = do_QueryInterface(sourceNode);
if (node && !nsContentUtils::LegacyIsCallerNativeCode()
&& !nsContentUtils::CanCallerAccess(node)) {
return nullptr;
}
return node.forget();
}
NS_IMETHODIMP
DataTransfer::GetMozSourceNode(nsIDOMNode** aSourceNode)
{
nsCOMPtr<nsINode> sourceNode = GetMozSourceNode();
if (!sourceNode) {
*aSourceNode = nullptr;
return NS_OK;
}
return CallQueryInterface(sourceNode, aSourceNode);
}
already_AddRefed<DOMStringList>
DataTransfer::MozTypesAt(uint32_t aIndex, CallerType aCallerType,
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++) {
if (items[i]->ChromeOnly() && aCallerType != CallerType::System) {
continue;
}
nsAutoString type;
items[i]->GetType(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(NS_LITERAL_STRING("Files"));
}
}
return types.forget();
}
nsresult
DataTransfer::GetDataAtNoSecurityCheck(const nsAString& aFormat,
uint32_t aIndex,
nsIVariant** aData)
{
return GetDataAtInternal(aFormat, aIndex,
nsContentUtils::GetSystemPrincipal(), aData);
}
nsresult
DataTransfer::GetDataAtInternal(const nsAString& aFormat, uint32_t aIndex,
nsIPrincipal* aSubjectPrincipal,
nsIVariant** aData)
{
*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 (!nsContentUtils::IsSystemPrincipal(aSubjectPrincipal) && 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,
nsIPrincipal& aSubjectPrincipal,
mozilla::ErrorResult& aRv)
{
nsCOMPtr<nsIVariant> data;
aRv = GetDataAtInternal(aFormat, aIndex, &aSubjectPrincipal,
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 (!nsContentUtils::IsSystemPrincipal(aPrincipal)) {
DataTransferItem::eKind kind = DataTransferItem::KindFromData(aData);
if (kind == DataTransferItem::KIND_OTHER) {
NS_WARNING("Disallowing adding non string/file types to DataTransfer");
return false;
}
if (aType.EqualsASCII(kFileMime) ||
aType.EqualsASCII(kFilePromiseMime)) {
NS_WARNING("Disallowing adding x-moz-file or x-moz-file-promize types to DataTransfer");
return false;
}
}
return true;
}
void
DataTransfer::TypesListMayHaveChanged()
{
DataTransferBinding::ClearCachedTypesValue(this);
}
nsresult
DataTransfer::SetDataAtInternal(const nsAString& aFormat, nsIVariant* aData,
uint32_t aIndex,
nsIPrincipal* aSubjectPrincipal)
{
if (aFormat.IsEmpty()) {
return NS_OK;
}
if (mReadOnly) {
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_TYPE_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,
nsIPrincipal& aSubjectPrincipal,
ErrorResult& aRv)
{
nsCOMPtr<nsIVariant> data;
aRv = nsContentUtils::XPConnect()->JSValToVariant(aCx, aData,
getter_AddRefs(data));
if (!aRv.Failed()) {
aRv = SetDataAtInternal(aFormat, data, aIndex, &aSubjectPrincipal);
}
}
void
DataTransfer::MozClearDataAt(const nsAString& aFormat, uint32_t aIndex,
nsIPrincipal& aSubjectPrincipal,
ErrorResult& aRv)
{
if (mReadOnly) {
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, aSubjectPrincipal, 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(!mReadOnly);
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 (!mReadOnly) {
mDragImage = &aImage;
mDragImageX = aX;
mDragImageY = aY;
}
}
NS_IMETHODIMP
DataTransfer::SetDragImage(nsIDOMElement* aImage, int32_t aX, int32_t aY)
{
nsCOMPtr<Element> image = do_QueryInterface(aImage);
if (image) {
SetDragImage(*image, aX, aY);
}
return NS_OK;
}
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.AsDOMNode(), aX, aY);
}
}
already_AddRefed<Promise>
DataTransfer::GetFilesAndDirectories(nsIPrincipal& aSubjectPrincipal,
ErrorResult& aRv)
{
nsCOMPtr<nsINode> parentNode = do_QueryInterface(mParent);
if (!parentNode) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
nsCOMPtr<nsIGlobalObject> global = parentNode->OwnerDoc()->GetScopeObject();
MOZ_ASSERT(global);
if (!global) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
RefPtr<Promise> p = Promise::Create(global, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
RefPtr<FileList> files = mItems->Files(&aSubjectPrincipal);
if (NS_WARN_IF(!files)) {
return nullptr;
}
Sequence<RefPtr<File>> filesSeq;
files->ToSequence(filesSeq, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
p->MaybeResolve(filesSeq);
return p.forget();
}
already_AddRefed<Promise>
DataTransfer::GetFiles(bool aRecursiveFlag,
nsIPrincipal& aSubjectPrincipal,
ErrorResult& aRv)
{
// Currently we don't support directories.
return GetFilesAndDirectories(aSubjectPrincipal, aRv);
}
void
DataTransfer::AddElement(Element& aElement, ErrorResult& aRv)
{
if (mReadOnly) {
aRv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
return;
}
mDragTarget = &aElement;
}
NS_IMETHODIMP
DataTransfer::AddElement(nsIDOMElement* aElement)
{
NS_ENSURE_TRUE(aElement, NS_ERROR_NULL_POINTER);
nsCOMPtr<Element> element = do_QueryInterface(aElement);
NS_ENSURE_TRUE(element, NS_ERROR_INVALID_ARG);
ErrorResult rv;
AddElement(*element, rv);
return rv.StealNSResult();
}
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);
newDataTransfer.forget(aNewDataTransfer);
return NS_OK;
}
already_AddRefed<nsIArray>
DataTransfer::GetTransferables(nsIDOMNode* aDragTarget)
{
MOZ_ASSERT(aDragTarget);
nsCOMPtr<nsINode> dragNode = do_QueryInterface(aDragTarget);
if (!dragNode) {
return nullptr;
}
nsIDocument* doc = dragNode->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, /*weak =*/ false);
}
}
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);
nsCOMPtr<nsIStorageStream> storageStream;
nsCOMPtr<nsIBinaryOutputStream> stream;
bool added = false;
bool handlingCustomFormats = true;
uint32_t totalCustomLength = 0;
const char* knownFormats[] = {
kTextMime, kHTMLMime, kNativeHTMLMime, kRTFMime,
kURLMime, kURLDataMime, kURLDescriptionMime, kURLPrivateMime,
kPNGImageMime, kJPEGImageMime, kGIFImageMime, kNativeImageMime,
kFileMime, kFilePromiseMime, kFilePromiseURLMime,
kFilePromiseDestFilename, kFilePromiseDirectoryMime,
kMozTextInternal, kHTMLContext, kHTMLInfo };
/*
* 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->GetType(type);
// If the data is of one of the well-known formats, use it directly.
bool isCustomFormat = true;
for (uint32_t f = 0; f < ArrayLength(knownFormats); f++) {
if (type.EqualsASCII(knownFormats[f])) {
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 (isCustomFormat) {
// 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 = do_CreateInstance("@mozilla.org/binaryoutputstream;1");
stream->SetOutputStream(outputStream);
}
int32_t formatLength = type.Length() * sizeof(nsString::char_type);
stream->Write32(eCustomClipboardTypeId_String);
stream->Write32(formatLength);
stream->WriteBytes((const char *)type.get(),
formatLength);
stream->Write32(lengthInBytes);
stream->WriteBytes((const char *)data.get(), lengthInBytes);
// 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.
totalCustomLength +=
formatLength + lengthInBytes + (sizeof(uint32_t) * 3);
}
}
} 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.
// Write out a terminator.
totalCustomLength += sizeof(uint32_t);
stream->Write32(eCustomClipboardTypeId_None);
nsCOMPtr<nsIInputStream> inputStream;
storageStream->NewInputStream(0, getter_AddRefs(inputStream));
RefPtr<nsStringBuffer> stringBuffer =
nsStringBuffer::Alloc(totalCustomLength + 1);
// Read the data from the string and add a null-terminator as ToString
// needs it.
uint32_t amountRead;
inputStream->Read(static_cast<char*>(stringBuffer->Data()),
totalCustomLength, &amountRead);
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,
totalCustomLength);
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;
}
// The underlying drag code uses text/unicode, so use that instead of
// text/plain
const char* format;
NS_ConvertUTF16toUTF8 utf8format(type);
if (utf8format.EqualsLiteral(kTextMime)) {
format = kUnicodeMime;
} else {
format = utf8format.get();
}
// 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);
transferable->SetConverter(converter);
continue;
}
nsresult rv = transferable->SetTransferData(format, convertedData,
lengthInBytes);
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(&type);
if (type == nsIDataType::VTYPE_INTERFACE ||
type == nsIDataType::VTYPE_INTERFACE_IS) {
nsCOMPtr<nsISupports> data;
if (NS_FAILED(aVariant->GetAsISupports(getter_AddRefs(data)))) {
return false;
}
nsCOMPtr<nsIFlavorDataProvider> fdp = do_QueryInterface(data);
if (fdp) {
// for flavour data providers, use kFlavorHasDataProvider (which has the
// value 0) as the length.
fdp.forget(aSupports);
*aLength = nsITransferable::kFlavorHasDataProvider;
}
else {
// wrap the item in an nsISupportsInterfacePointer
nsCOMPtr<nsISupportsInterfacePointer> ptrSupports =
do_CreateInstance(NS_SUPPORTS_INTERFACE_POINTER_CONTRACTID);
if (!ptrSupports) {
return false;
}
ptrSupports->SetData(data);
ptrSupports.forget(aSupports);
*aLength = sizeof(nsISupportsInterfacePointer *);
}
return true;
}
char16_t* chrs;
uint32_t len = 0;
nsresult rv = aVariant->GetAsWStringWithSize(&len, &chrs);
if (NS_FAILED(rv)) {
return false;
}
nsAutoString str;
str.Adopt(chrs, len);
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() << 1;
return true;
}
void
DataTransfer::ClearAll()
{
mItems->ClearAllItems();
}
uint32_t
DataTransfer::MozItemCount() const
{
return mItems->MozItemCount();
}
nsresult
DataTransfer::SetDataWithPrincipal(const nsAString& aFormat,
nsIVariant* aData,
uint32_t aIndex,
nsIPrincipal* aPrincipal)
{
nsAutoString format;
GetRealFormat(aFormat, format);
ErrorResult rv;
RefPtr<DataTransferItem> item =
mItems->SetDataWithPrincipal(format, aData, aIndex, aPrincipal,
/* aInsertOnly = */ false,
/* aHidden= */ false,
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
{
// 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);
}
nsresult
DataTransfer::CacheExternalData(const char* aFormat, uint32_t aIndex,
nsIPrincipal* aPrincipal, bool aHidden)
{
ErrorResult rv;
RefPtr<DataTransferItem> item;
if (strcmp(aFormat, kUnicodeMime) == 0) {
item = mItems->SetDataWithPrincipal(NS_LITERAL_STRING("text/plain"), 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(NS_LITERAL_STRING("text/uri-list"), 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
const char* formats[] = { kFileMime, kHTMLMime, kURLMime, kURLDataMime,
kUnicodeMime, 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()
{
NS_ASSERTION(mEventMessage == ePaste,
"caching clipboard data for invalid event");
// 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.
nsCOMPtr<nsIClipboard> clipboard =
do_GetService("@mozilla.org/widget/clipboard;1");
if (!clipboard || mClipboardType < 0) {
return;
}
nsIScriptSecurityManager* ssm = nsContentUtils::GetSecurityManager();
nsCOMPtr<nsIPrincipal> sysPrincipal;
ssm->GetSystemPrincipal(getter_AddRefs(sysPrincipal));
// Check if the clipboard has any files
bool hasFileData = false;
const char *fileMime[] = { kFileMime };
clipboard->HasDataMatchingFlavors(fileMime, 1, mClipboardType, &hasFileData);
// We will be ignoring any application/x-moz-file files found in the paste
// datatransfer within e10s, as they will fail to be sent over IPC. Because of
// that, we will unset hasFileData, whether or not it would have been set.
// (bug 1308007)
if (XRE_IsContentProcess()) {
hasFileData = false;
}
// 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.
// NOTE: kCustomTypesMime must have index 0, kFileMime index 1
const char* formats[] = { kCustomTypesMime, kFileMime, kHTMLMime, kRTFMime,
kURLMime, kURLDataMime, kUnicodeMime, kPNGImageMime };
for (uint32_t f = 0; f < mozilla::ArrayLength(formats); ++f) {
// check each format one at a time
bool supported;
clipboard->HasDataMatchingFlavors(&(formats[f]), 1, mClipboardType,
&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) {
if (f == 0) {
FillInExternalCustomTypes(0, sysPrincipal);
} else {
// In non-e10s we support pasting files from explorer.exe.
// Unfortunately, we fail to send that data over IPC in e10s, so we
// don't want to add the item to the DataTransfer and end up producing a
// null `application/x-moz-file`. (bug 1308007)
if (XRE_IsContentProcess() && f == 1) {
continue;
}
// If we aren't the file data, and we have file data, we want to be hidden
CacheExternalData(formats[f], 0, sysPrincipal, /* hidden = */ f != 1 && 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(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;
}
nsAutoCString str;
str.Adopt(chrs, len);
nsCOMPtr<nsIInputStream> stringStream;
NS_NewCStringInputStream(getter_AddRefs(stringStream), str);
nsCOMPtr<nsIBinaryInputStream> stream =
do_CreateInstance("@mozilla.org/binaryinputstream;1");
if (!stream) {
return;
}
stream->SetInputStream(stringStream);
uint32_t type;
do {
stream->Read32(&type);
if (type == eCustomClipboardTypeId_String) {
uint32_t formatLength;
stream->Read32(&formatLength);
char* formatBytes;
stream->ReadBytes(formatLength, &formatBytes);
nsAutoString format;
format.Adopt(reinterpret_cast<char16_t*>(formatBytes),
formatLength / sizeof(char16_t));
uint32_t dataLength;
stream->Read32(&dataLength);
char* dataBytes;
stream->ReadBytes(dataLength, &dataBytes);
nsAutoString data;
data.Adopt(reinterpret_cast<char16_t*>(dataBytes),
dataLength / sizeof(char16_t));
RefPtr<nsVariantCC> variant = new nsVariantCC();
variant->SetAsAString(data);
SetDataWithPrincipal(format, variant, aIndex, aPrincipal);
}
} while (type != eCustomClipboardTypeId_None);
}
} // namespace dom
} // namespace mozilla
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