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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
/*
Notes to self:
- at some point, strings will be accessible from JS, so we won't have to wrap
flavors in an nsISupportsCString. Until then, we're kinda stuck with
this crappy API of nsIArrays.
*/
#include "nsTransferable.h"
#include "nsAnonymousTemporaryFile.h"
#include "nsArray.h"
#include "nsArrayUtils.h"
#include "nsString.h"
#include "nsReadableUtils.h"
#include "nsTArray.h"
#include "nsIFormatConverter.h"
#include "nsIContentPolicy.h"
#include "nsCOMPtr.h"
#include "nsXPCOM.h"
#include "nsISupportsPrimitives.h"
#include "nsMemory.h"
#include "nsPrimitiveHelpers.h"
#include "nsDirectoryServiceDefs.h"
#include "nsDirectoryService.h"
#include "nsCRT.h"
#include "nsNetUtil.h"
#include "nsILoadContext.h"
#include "nsXULAppAPI.h"
#include "mozilla/UniquePtr.h"
using namespace mozilla;
NS_IMPL_ISUPPORTS(nsTransferable, nsITransferable)
DataStruct::DataStruct(DataStruct&& aRHS)
: mData(aRHS.mData.forget()),
mCacheFD(aRHS.mCacheFD),
mFlavor(aRHS.mFlavor) {
aRHS.mCacheFD = nullptr;
}
//-------------------------------------------------------------------------
DataStruct::~DataStruct() {
if (mCacheFD) {
PR_Close(mCacheFD);
}
}
//-------------------------------------------------------------------------
void DataStruct::SetData(nsISupports* aData, bool aIsPrivateData) {
// Now, check to see if we consider the data to be "too large"
// as well as ensuring that private browsing mode is disabled.
// File IO is not allowed in content processes.
if (!aIsPrivateData && XRE_IsParentProcess()) {
void* data = nullptr;
uint32_t dataLen = 0;
nsPrimitiveHelpers::CreateDataFromPrimitive(mFlavor, aData, &data,
&dataLen);
if (dataLen > kLargeDatasetSize) {
// Too large, cache it to disk instead of memory.
if (NS_SUCCEEDED(WriteCache(data, dataLen))) {
free(data);
// Clear previously set small data.
mData = nullptr;
return;
}
NS_WARNING("Oh no, couldn't write data to the cache file");
}
free(data);
}
if (mCacheFD) {
// Clear previously set big data.
PR_Close(mCacheFD);
mCacheFD = nullptr;
}
mData = aData;
}
//-------------------------------------------------------------------------
void DataStruct::GetData(nsISupports** aData) {
// check here to see if the data is cached on disk
if (mCacheFD) {
// if so, read it in and pass it back
// ReadCache creates memory and copies the data into it.
if (NS_SUCCEEDED(ReadCache(aData))) {
return;
}
// oh shit, something went horribly wrong here.
NS_WARNING("Oh no, couldn't read data in from the cache file");
*aData = nullptr;
PR_Close(mCacheFD);
mCacheFD = nullptr;
return;
}
nsCOMPtr<nsISupports> data = mData;
data.forget(aData);
}
//-------------------------------------------------------------------------
nsresult DataStruct::WriteCache(void* aData, uint32_t aDataLen) {
MOZ_ASSERT(aData && aDataLen);
MOZ_ASSERT(aDataLen <= uint32_t(std::numeric_limits<int32_t>::max()),
"too large size for PR_Write");
nsresult rv;
if (!mCacheFD) {
rv = NS_OpenAnonymousTemporaryFile(&mCacheFD);
if (NS_FAILED(rv)) {
return NS_ERROR_FAILURE;
}
} else if (PR_Seek64(mCacheFD, 0, PR_SEEK_SET) == -1) {
return NS_ERROR_FAILURE;
}
// Write out the contents of the clipboard to the file.
int32_t written = PR_Write(mCacheFD, aData, aDataLen);
if (written == int32_t(aDataLen)) {
return NS_OK;
}
PR_Close(mCacheFD);
mCacheFD = nullptr;
return NS_ERROR_FAILURE;
}
//-------------------------------------------------------------------------
nsresult DataStruct::ReadCache(nsISupports** aData) {
if (!mCacheFD) {
return NS_ERROR_FAILURE;
}
PRFileInfo fileInfo;
if (PR_GetOpenFileInfo(mCacheFD, &fileInfo) != PR_SUCCESS) {
return NS_ERROR_FAILURE;
}
if (PR_Seek64(mCacheFD, 0, PR_SEEK_SET) == -1) {
return NS_ERROR_FAILURE;
}
uint32_t fileSize = fileInfo.size;
auto data = MakeUnique<char[]>(fileSize);
if (!data) {
return NS_ERROR_OUT_OF_MEMORY;
}
uint32_t actual = PR_Read(mCacheFD, data.get(), fileSize);
if (actual != fileSize) {
return NS_ERROR_FAILURE;
}
nsPrimitiveHelpers::CreatePrimitiveForData(mFlavor, data.get(), fileSize,
aData);
return NS_OK;
}
//-------------------------------------------------------------------------
//
// Transferable constructor
//
//-------------------------------------------------------------------------
nsTransferable::nsTransferable()
: mPrivateData(false),
mContentPolicyType(nsIContentPolicy::TYPE_OTHER)
#ifdef DEBUG
,
mInitialized(false)
#endif
{
}
//-------------------------------------------------------------------------
//
// Transferable destructor
//
//-------------------------------------------------------------------------
nsTransferable::~nsTransferable() = default;
NS_IMETHODIMP
nsTransferable::Init(nsILoadContext* aContext) {
MOZ_ASSERT(!mInitialized);
if (aContext) {
mPrivateData = aContext->UsePrivateBrowsing();
}
#ifdef DEBUG
mInitialized = true;
#endif
return NS_OK;
}
//
// GetTransferDataFlavors
//
// Returns a copy of the internal list of flavors. This does NOT take into
// account any converter that may be registered.
//
void nsTransferable::GetTransferDataFlavors(nsTArray<nsCString>& aFlavors) {
MOZ_ASSERT(mInitialized);
for (size_t i = 0; i < mDataArray.Length(); ++i) {
DataStruct& data = mDataArray.ElementAt(i);
aFlavors.AppendElement(data.GetFlavor());
}
}
Maybe<size_t> nsTransferable::FindDataFlavor(const char* aFlavor) {
nsDependentCString flavor(aFlavor);
for (size_t i = 0; i < mDataArray.Length(); ++i) {
if (mDataArray[i].GetFlavor().Equals(flavor)) {
return Some(i);
}
}
return Nothing();
}
//
// GetTransferData
//
// Returns the data of the requested flavor, obtained from either having the
// data on hand or using a converter to get it. The data is wrapped in a
// nsISupports primitive so that it is accessible from JS.
//
NS_IMETHODIMP
nsTransferable::GetTransferData(const char* aFlavor, nsISupports** aData) {
MOZ_ASSERT(mInitialized);
*aData = nullptr;
nsresult rv = NS_OK;
// First look and see if the data is present in one of the intrinsic flavors.
if (Maybe<size_t> index = FindDataFlavor(aFlavor)) {
nsCOMPtr<nsISupports> dataBytes;
mDataArray[index.value()].GetData(getter_AddRefs(dataBytes));
// Do we have a (lazy) data provider?
if (nsCOMPtr<nsIFlavorDataProvider> dataProvider =
do_QueryInterface(dataBytes)) {
rv =
dataProvider->GetFlavorData(this, aFlavor, getter_AddRefs(dataBytes));
if (NS_FAILED(rv)) {
dataBytes = nullptr;
// The provider failed, fall into the converter code below.
}
}
if (dataBytes) {
dataBytes.forget(aData);
return NS_OK;
}
// Empty data
}
// If not, try using a format converter to get the requested flavor.
if (mFormatConv) {
for (size_t i = 0; i < mDataArray.Length(); ++i) {
DataStruct& data = mDataArray.ElementAt(i);
bool canConvert = false;
mFormatConv->CanConvert(data.GetFlavor().get(), aFlavor, &canConvert);
if (canConvert) {
nsCOMPtr<nsISupports> dataBytes;
data.GetData(getter_AddRefs(dataBytes));
// Do we have a (lazy) data provider?
if (nsCOMPtr<nsIFlavorDataProvider> dataProvider =
do_QueryInterface(dataBytes)) {
rv = dataProvider->GetFlavorData(this, aFlavor,
getter_AddRefs(dataBytes));
if (NS_FAILED(rv)) {
// Give up.
return rv;
}
}
return mFormatConv->Convert(data.GetFlavor().get(), dataBytes, aFlavor,
aData);
}
}
}
return NS_ERROR_FAILURE;
}
//
// GetAnyTransferData
//
// Returns the data of the first flavor found. Caller is responsible for
// deleting the flavor string.
//
NS_IMETHODIMP
nsTransferable::GetAnyTransferData(nsACString& aFlavor, nsISupports** aData) {
MOZ_ASSERT(mInitialized);
for (size_t i = 0; i < mDataArray.Length(); ++i) {
DataStruct& data = mDataArray.ElementAt(i);
if (data.IsDataAvailable()) {
aFlavor.Assign(data.GetFlavor());
data.GetData(aData);
return NS_OK;
}
}
return NS_ERROR_FAILURE;
}
//
// SetTransferData
//
//
//
NS_IMETHODIMP
nsTransferable::SetTransferData(const char* aFlavor, nsISupports* aData) {
MOZ_ASSERT(mInitialized);
// first check our intrinsic flavors to see if one has been registered.
if (Maybe<size_t> index = FindDataFlavor(aFlavor)) {
DataStruct& data = mDataArray.ElementAt(index.value());
data.SetData(aData, mPrivateData);
return NS_OK;
}
// if not, try using a format converter to find a flavor to put the data in
if (mFormatConv) {
for (size_t i = 0; i < mDataArray.Length(); ++i) {
DataStruct& data = mDataArray.ElementAt(i);
bool canConvert = false;
mFormatConv->CanConvert(aFlavor, data.GetFlavor().get(), &canConvert);
if (canConvert) {
nsCOMPtr<nsISupports> ConvertedData;
mFormatConv->Convert(aFlavor, aData, data.GetFlavor().get(),
getter_AddRefs(ConvertedData));
data.SetData(ConvertedData, mPrivateData);
return NS_OK;
}
}
}
// Can't set data neither directly nor through converter. Just add this flavor
// and try again
if (NS_SUCCEEDED(AddDataFlavor(aFlavor))) {
return SetTransferData(aFlavor, aData);
}
return NS_ERROR_FAILURE;
}
//
// AddDataFlavor
//
// Adds a data flavor to our list with no data. Error if it already exists.
//
NS_IMETHODIMP
nsTransferable::AddDataFlavor(const char* aDataFlavor) {
MOZ_ASSERT(mInitialized);
if (FindDataFlavor(aDataFlavor).isSome()) {
return NS_ERROR_FAILURE;
}
// Create a new "slot" for the data
mDataArray.AppendElement(DataStruct(aDataFlavor));
return NS_OK;
}
//
// RemoveDataFlavor
//
// Removes a data flavor (and causes the data to be destroyed). Error if
// the requested flavor is not present.
//
NS_IMETHODIMP
nsTransferable::RemoveDataFlavor(const char* aDataFlavor) {
MOZ_ASSERT(mInitialized);
if (Maybe<size_t> index = FindDataFlavor(aDataFlavor)) {
mDataArray.RemoveElementAt(index.value());
return NS_OK;
}
return NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsTransferable::SetConverter(nsIFormatConverter* aConverter) {
MOZ_ASSERT(mInitialized);
mFormatConv = aConverter;
return NS_OK;
}
NS_IMETHODIMP
nsTransferable::GetConverter(nsIFormatConverter** aConverter) {
MOZ_ASSERT(mInitialized);
nsCOMPtr<nsIFormatConverter> converter = mFormatConv;
converter.forget(aConverter);
return NS_OK;
}
//
// FlavorsTransferableCanImport
//
// Computes a list of flavors that the transferable can accept into it, either
// through intrinsic knowledge or input data converters.
//
NS_IMETHODIMP
nsTransferable::FlavorsTransferableCanImport(nsTArray<nsCString>& aFlavors) {
MOZ_ASSERT(mInitialized);
// Get the flavor list, and on to the end of it, append the list of flavors we
// can also get to through a converter. This is so that we can just walk the
// list in one go, looking for the desired flavor.
GetTransferDataFlavors(aFlavors);
if (mFormatConv) {
nsTArray<nsCString> convertedList;
mFormatConv->GetInputDataFlavors(convertedList);
for (uint32_t i = 0; i < convertedList.Length(); ++i) {
nsCString& flavorStr = convertedList[i];
// Don't append if already in intrinsic list
if (!aFlavors.Contains(flavorStr)) {
aFlavors.AppendElement(flavorStr);
}
}
}
return NS_OK;
}
//
// FlavorsTransferableCanExport
//
// Computes a list of flavors that the transferable can export, either through
// intrinsic knowledge or output data converters.
//
NS_IMETHODIMP
nsTransferable::FlavorsTransferableCanExport(nsTArray<nsCString>& aFlavors) {
MOZ_ASSERT(mInitialized);
// Get the flavor list, and on to the end of it, append the list of flavors we
// can also get to through a converter. This is so that we can just walk the
// list in one go, looking for the desired flavor.
GetTransferDataFlavors(aFlavors);
if (mFormatConv) {
nsTArray<nsCString> convertedList;
mFormatConv->GetOutputDataFlavors(convertedList);
for (uint32_t i = 0; i < convertedList.Length(); ++i) {
nsCString& flavorStr = convertedList[i];
// Don't append if already in intrinsic list
if (!aFlavors.Contains(flavorStr)) {
aFlavors.AppendElement(flavorStr);
}
}
}
return NS_OK;
}
bool nsTransferable::GetIsPrivateData() {
MOZ_ASSERT(mInitialized);
return mPrivateData;
}
void nsTransferable::SetIsPrivateData(bool aIsPrivateData) {
MOZ_ASSERT(mInitialized);
mPrivateData = aIsPrivateData;
}
nsIPrincipal* nsTransferable::GetRequestingPrincipal() {
MOZ_ASSERT(mInitialized);
return mRequestingPrincipal;
}
void nsTransferable::SetRequestingPrincipal(
nsIPrincipal* aRequestingPrincipal) {
MOZ_ASSERT(mInitialized);
mRequestingPrincipal = aRequestingPrincipal;
}
nsContentPolicyType nsTransferable::GetContentPolicyType() {
MOZ_ASSERT(mInitialized);
return mContentPolicyType;
}
void nsTransferable::SetContentPolicyType(
nsContentPolicyType aContentPolicyType) {
MOZ_ASSERT(mInitialized);
mContentPolicyType = aContentPolicyType;
}