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DataTransfer.cpp
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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 "nsError.h"
#include "nsIDragService.h"
#include "nsIClipboard.h"
#include "nsContentUtils.h"
#include "nsIContent.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/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"
namespace mozilla {
namespace dom {
inline void
ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback,
TransferItem& aField,
const char* aName,
uint32_t aFlags = 0)
{
ImplCycleCollectionTraverse(aCallback, aField.mData, aName, aFlags);
}
NS_IMPL_CYCLE_COLLECTION_CLASS(DataTransfer)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(DataTransfer)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mParent)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mFiles)
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(mFiles)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mItems)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDragTarget)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDragImage)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
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"
};
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)
{
// 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 ||
aEventMessage == eLegacyDragGesture) {
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,
nsTArray<nsTArray<TransferItem> >& 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)
, mItems(aItems)
, mDragImage(aDragImage)
, mDragImageX(aDragImageX)
, mDragImageY(aDragImageY)
{
MOZ_ASSERT(mParent);
// 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
// draggesture and dragstart events are the only times when items are
// modifiable, but those events should have been using the first constructor
// above.
NS_ASSERTION(aEventMessage != eLegacyDragGesture &&
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 = do_GetAtom(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;
}
FileList*
DataTransfer::GetFiles(ErrorResult& aRv)
{
return GetFilesInternal(aRv, nsContentUtils::SubjectPrincipal());
}
FileList*
DataTransfer::GetFilesInternal(ErrorResult& aRv, nsIPrincipal* aSubjectPrincipal)
{
if (mEventMessage != eDrop &&
mEventMessage != eLegacyDragDrop &&
mEventMessage != ePaste) {
return nullptr;
}
if (!mFiles) {
mFiles = new FileList(static_cast<nsIDOMDataTransfer*>(this));
uint32_t count = mItems.Length();
for (uint32_t i = 0; i < count; i++) {
nsCOMPtr<nsIVariant> variant;
aRv = GetDataAtInternal(NS_ConvertUTF8toUTF16(kFileMime), i, aSubjectPrincipal, getter_AddRefs(variant));
if (aRv.Failed()) {
return nullptr;
}
if (!variant)
continue;
nsCOMPtr<nsISupports> supports;
nsresult rv = variant->GetAsISupports(getter_AddRefs(supports));
if (NS_FAILED(rv))
continue;
nsCOMPtr<nsIFile> file = do_QueryInterface(supports);
RefPtr<File> domFile;
if (file) {
#ifdef DEBUG
if (XRE_GetProcessType() == GeckoProcessType_Default) {
bool isDir;
file->IsDirectory(&isDir);
MOZ_ASSERT(!isDir, "How did we get here?");
}
#endif
domFile = File::CreateFromFile(GetParentObject(), file);
} else {
nsCOMPtr<BlobImpl> blobImpl = do_QueryInterface(supports);
if (!blobImpl) {
continue;
}
MOZ_ASSERT(blobImpl->IsFile());
domFile = File::Create(GetParentObject(), blobImpl);
MOZ_ASSERT(domFile);
}
if (!mFiles->Append(domFile)) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
}
}
return mFiles;
}
NS_IMETHODIMP
DataTransfer::GetFiles(nsIDOMFileList** aFileList)
{
ErrorResult rv;
NS_IF_ADDREF(*aFileList = GetFilesInternal(rv, nsContentUtils::GetSystemPrincipal()));
return rv.StealNSResult();
}
already_AddRefed<DOMStringList>
DataTransfer::Types()
{
RefPtr<DOMStringList> types = new DOMStringList();
if (mItems.Length()) {
bool addFile = false;
const nsTArray<TransferItem>& item = mItems[0];
for (uint32_t i = 0; i < item.Length(); i++) {
const nsString& format = item[i].mFormat;
types->Add(format);
if (!addFile) {
addFile = format.EqualsASCII(kFileMime) ||
format.EqualsASCII("application/x-moz-file-promise");
}
}
if (addFile) {
types->Add(NS_LITERAL_STRING("Files"));
}
}
return types.forget();
}
NS_IMETHODIMP
DataTransfer::GetTypes(nsISupports** aTypes)
{
RefPtr<DOMStringList> types = Types();
types.forget(aTypes);
return NS_OK;
}
void
DataTransfer::GetData(const nsAString& aFormat, nsAString& aData,
ErrorResult& aRv)
{
// return an empty string if data for the format was not found
aData.Truncate();
nsCOMPtr<nsIVariant> data;
nsresult rv = GetDataAtInternal(aFormat, 0, nsContentUtils::SubjectPrincipal(), 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;
}
}
}
NS_IMETHODIMP
DataTransfer::GetData(const nsAString& aFormat, nsAString& aData)
{
ErrorResult rv;
GetData(aFormat, aData, rv);
return rv.StealNSResult();
}
void
DataTransfer::SetData(const nsAString& aFormat, const nsAString& aData,
ErrorResult& aRv)
{
RefPtr<nsVariantCC> variant = new nsVariantCC();
variant->SetAsAString(aData);
aRv = SetDataAtInternal(aFormat, variant, 0, nsContentUtils::SubjectPrincipal());
}
void
DataTransfer::ClearData(const Optional<nsAString>& aFormat, ErrorResult& aRv)
{
if (mReadOnly) {
aRv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
return;
}
if (mItems.Length() == 0) {
return;
}
if (aFormat.WasPassed()) {
MozClearDataAtHelper(aFormat.Value(), 0, aRv);
} else {
MozClearDataAtHelper(EmptyString(), 0, aRv);
}
}
NS_IMETHODIMP
DataTransfer::ClearData(const nsAString& aFormat)
{
Optional<nsAString> format;
format = &aFormat;
ErrorResult rv;
ClearData(format, rv);
return rv.StealNSResult();
}
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, ErrorResult& aRv)
{
// 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 < mItems.Length()) {
// note that you can retrieve the types regardless of their principal
nsTArray<TransferItem>& item = mItems[aIndex];
for (uint32_t i = 0; i < item.Length(); i++)
types->Add(item[i].mFormat);
}
return types.forget();
}
NS_IMETHODIMP
DataTransfer::MozTypesAt(uint32_t aIndex, nsISupports** aTypes)
{
ErrorResult rv;
RefPtr<DOMStringList> types = MozTypesAt(aIndex, rv);
types.forget(aTypes);
return rv.StealNSResult();
}
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 >= mItems.Length()) {
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);
nsTArray<TransferItem>& item = mItems[aIndex];
// Check if the caller is allowed to access the drag data. Callers with
// chrome privileges can always read the data. During the
// drop event, allow retrieving the data except in the case where the
// source of the drag is in a child frame of the caller. In that case,
// we only allow access to data of the same principal. During other events,
// only allow access to the data with the same principal.
bool checkFormatItemPrincipal = mIsCrossDomainSubFrameDrop ||
(mEventMessage != eDrop && mEventMessage != eLegacyDragDrop &&
mEventMessage != ePaste);
uint32_t count = item.Length();
for (uint32_t i = 0; i < count; i++) {
TransferItem& formatitem = item[i];
if (formatitem.mFormat.Equals(format)) {
if (formatitem.mPrincipal && checkFormatItemPrincipal &&
!aSubjectPrincipal->Subsumes(formatitem.mPrincipal)) {
return NS_ERROR_DOM_SECURITY_ERR;
}
if (!formatitem.mData) {
FillInExternalData(formatitem, aIndex);
} else {
nsCOMPtr<nsISupports> data;
formatitem.mData->GetAsISupports(getter_AddRefs(data));
// Make sure the code that is calling us is same-origin with the data.
nsCOMPtr<EventTarget> pt = do_QueryInterface(data);
if (pt) {
nsresult rv = NS_OK;
nsIScriptContext* c = pt->GetContextForEventHandlers(&rv);
NS_ENSURE_TRUE(c && NS_SUCCEEDED(rv), NS_ERROR_DOM_SECURITY_ERR);
nsIGlobalObject* go = c->GetGlobalObject();
NS_ENSURE_TRUE(go, NS_ERROR_DOM_SECURITY_ERR);
nsCOMPtr<nsIScriptObjectPrincipal> sp = do_QueryInterface(go);
MOZ_ASSERT(sp, "This cannot fail on the main thread.");
nsIPrincipal* dataPrincipal = sp->GetPrincipal();
NS_ENSURE_TRUE(dataPrincipal, NS_ERROR_DOM_SECURITY_ERR);
NS_ENSURE_TRUE(aSubjectPrincipal->Subsumes(dataPrincipal), NS_ERROR_DOM_SECURITY_ERR);
}
}
*aData = formatitem.mData;
NS_IF_ADDREF(*aData);
return NS_OK;
}
}
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::SubjectPrincipal(), 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;
}
}
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 > mItems.Length()) {
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 non-chrome to add file data
// XXX perhaps this should also limit any non-string type as well
if ((aFormat.EqualsLiteral("application/x-moz-file-promise") ||
aFormat.EqualsLiteral("application/x-moz-file")) &&
!nsContentUtils::IsSystemPrincipal(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::SubjectPrincipal());
}
}
void
DataTransfer::MozClearDataAt(const nsAString& aFormat, uint32_t aIndex,
ErrorResult& aRv)
{
if (mReadOnly) {
aRv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
return;
}
if (aIndex >= mItems.Length()) {
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, aRv);
}
void
DataTransfer::MozClearDataAtHelper(const nsAString& aFormat, uint32_t aIndex,
ErrorResult& aRv)
{
MOZ_ASSERT(!mReadOnly);
MOZ_ASSERT(aIndex < mItems.Length());
MOZ_ASSERT(aIndex == 0 ||
(mEventMessage != eCut && mEventMessage != eCopy &&
mEventMessage != ePaste));
nsAutoString format;
GetRealFormat(aFormat, format);
nsIPrincipal* principal = nsContentUtils::SubjectPrincipal();
// if the format is empty, clear all formats
bool clearall = format.IsEmpty();
nsTArray<TransferItem>& item = mItems[aIndex];
// count backwards so that the count and index don't have to be adjusted
// after removing an element
for (int32_t i = item.Length() - 1; i >= 0; i--) {
TransferItem& formatitem = item[i];
if (clearall || formatitem.mFormat.Equals(format)) {
// don't allow removing data that has a stronger principal
bool subsumes;
if (formatitem.mPrincipal && principal &&
(NS_FAILED(principal->Subsumes(formatitem.mPrincipal, &subsumes)) || !subsumes)) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return;
}
item.RemoveElementAt(i);
// if a format was specified, break out. Otherwise, loop around until
// all formats have been removed
if (!clearall)
break;
}
}
// if the last format for an item is removed, remove the entire item
if (!item.Length())
mItems.RemoveElementAt(aIndex);
}
NS_IMETHODIMP
DataTransfer::MozClearDataAt(const nsAString& aFormat, uint32_t aIndex)
{
ErrorResult rv;
MozClearDataAt(aFormat, aIndex, rv);
return rv.StealNSResult();
}
void
DataTransfer::SetDragImage(Element& aImage, int32_t aX, int32_t aY,
ErrorResult& aRv)
{
if (mReadOnly) {
aRv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
return;
}
mDragImage = &aImage;
mDragImageX = aX;
mDragImageY = aY;
}
NS_IMETHODIMP
DataTransfer::SetDragImage(nsIDOMElement* aImage, int32_t aX, int32_t aY)
{
ErrorResult rv;
nsCOMPtr<Element> image = do_QueryInterface(aImage);
if (image) {
SetDragImage(*image, aX, aY, rv);
}
return rv.StealNSResult();
}
static already_AddRefed<OSFileSystem>
MakeOrReuseFileSystem(const nsAString& aNewLocalRootPath,
OSFileSystem* aFS,
nsPIDOMWindow* aWindow)
{
MOZ_ASSERT(aWindow);
RefPtr<OSFileSystem> fs;
if (aFS) {
const nsAString& prevLocalRootPath = aFS->GetLocalRootPath();
if (aNewLocalRootPath == prevLocalRootPath) {
fs = aFS;
}
}
if (!fs) {
fs = new OSFileSystem(aNewLocalRootPath);
fs->Init(aWindow);
}
return fs.forget();
}
already_AddRefed<Promise>
DataTransfer::GetFilesAndDirectories(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 (aRv.Failed()) {
return nullptr;
}
if (!mFiles) {
GetFiles(aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
}
Sequence<OwningFileOrDirectory> filesAndDirsSeq;
if (mFiles && mFiles->Length()) {
if (!filesAndDirsSeq.SetLength(mFiles->Length(), mozilla::fallible_t())) {
p->MaybeReject(NS_ERROR_OUT_OF_MEMORY);
return p.forget();
}
nsPIDOMWindow* window = parentNode->OwnerDoc()->GetInnerWindow();
RefPtr<OSFileSystem> fs;
for (uint32_t i = 0; i < mFiles->Length(); ++i) {
if (mFiles->Item(i)->Impl()->IsDirectory()) {
#if defined(ANDROID) || defined(MOZ_B2G)
MOZ_ASSERT(false,
"Directory picking should have been redirected to normal "
"file picking for platforms that don't have a directory "
"picker");
#endif
nsAutoString path;
mFiles->Item(i)->GetMozFullPathInternal(path, aRv);
if (aRv.Failed()) {
return nullptr;
}
int32_t leafSeparatorIndex = path.RFind(FILE_PATH_SEPARATOR);
nsDependentSubstring dirname = Substring(path, 0, leafSeparatorIndex);
nsDependentSubstring basename = Substring(path, leafSeparatorIndex);
fs = MakeOrReuseFileSystem(dirname, fs, window);
filesAndDirsSeq[i].SetAsDirectory() = new Directory(fs, basename);
} else {
filesAndDirsSeq[i].SetAsFile() = mFiles->Item(i);
}
}
}
p->MaybeResolve(filesAndDirsSeq);
return p.forget();
}
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)
{
DataTransfer* newDataTransfer =
new DataTransfer(aParent, aEventMessage, mEffectAllowed, mCursorState,
mIsExternal, aUserCancelled, aIsCrossDomainSubFrameDrop,
mClipboardType, mItems, mDragImage, mDragImageX,
mDragImageY);
*aNewDataTransfer = newDataTransfer;
NS_ADDREF(*aNewDataTransfer);
return NS_OK;
}
already_AddRefed<nsISupportsArray>
DataTransfer::GetTransferables(nsIDOMNode* aDragTarget)
{
MOZ_ASSERT(aDragTarget);
nsCOMPtr<nsINode> dragNode = do_QueryInterface(aDragTarget);
if (!dragNode) {
return nullptr;
}
nsIDocument* doc = dragNode->GetCurrentDoc();
if (!doc) {
return nullptr;
}
return GetTransferables(doc->GetLoadContext());
}
already_AddRefed<nsISupportsArray>
DataTransfer::GetTransferables(nsILoadContext* aLoadContext)
{
nsCOMPtr<nsISupportsArray> transArray =
do_CreateInstance("@mozilla.org/supports-array;1");
if (!transArray) {
return nullptr;
}
uint32_t count = mItems.Length();
for (uint32_t i = 0; i < count; i++) {
nsCOMPtr<nsITransferable> transferable = GetTransferable(i, aLoadContext);
if (transferable) {
transArray->AppendElement(transferable);
}
}