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/* -*- Mode: C++; tab-width: 8; 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/. */
#include "ContentAnalysis.h"
#include "mozilla/ClipboardContentAnalysisParent.h"
#include "mozilla/ClipboardReadRequestParent.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/WindowContext.h"
#include "mozilla/dom/WindowGlobalParent.h"
#include "mozilla/Maybe.h"
#include "mozilla/MozPromise.h"
#include "nsBaseClipboard.h"
#include "nsIClipboard.h"
#include "nsID.h"
#include "nsITransferable.h"
namespace mozilla {
namespace {
using ClipboardResultPromise =
MozPromise<dom::IPCTransferableData, nsresult, true>;
static RefPtr<ClipboardResultPromise> GetClipboardImpl(
const nsTArray<nsCString>& aTypes,
nsIClipboard::ClipboardType aWhichClipboard,
uint64_t aRequestingWindowContextId, bool aCheckAllContent,
dom::ThreadsafeContentParentHandle* aRequestingContentParent) {
AssertIsOnMainThread();
RefPtr<dom::WindowGlobalParent> window =
dom::WindowGlobalParent::GetByInnerWindowId(aRequestingWindowContextId);
// We expect content processes to always pass a non-null window so
// Content Analysis can analyze it. (if Content Analysis is
// active) There may be some cases when a window is closing, etc.,
// in which case returning no clipboard content should not be a
// problem.
if (!window) {
return ClipboardResultPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
}
if (window->IsDiscarded()) {
NS_WARNING(
"discarded window passed to RecvGetClipboard(); returning "
"no clipboard "
"content");
return ClipboardResultPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
}
if (aRequestingContentParent->ChildID() != window->ContentParentId()) {
NS_WARNING("incorrect content process passing window to GetClipboard");
return ClipboardResultPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
}
// Retrieve clipboard
nsCOMPtr<nsIClipboard> clipboard =
do_GetService("@mozilla.org/widget/clipboard;1");
if (!clipboard) {
return ClipboardResultPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
}
auto transferableToCheck =
dom::ContentParent::CreateClipboardTransferable(aTypes);
if (transferableToCheck.isErr()) {
return ClipboardResultPromise::CreateAndReject(
transferableToCheck.unwrapErr(), __func__);
}
nsCOMPtr<nsITransferable> transferable = transferableToCheck.unwrap();
if (aCheckAllContent) {
for (const auto& type : aTypes) {
AutoTArray<nsCString, 1> singleTypeArray{type};
auto singleTransferableToCheck =
dom::ContentParent::CreateClipboardTransferable(singleTypeArray);
if (singleTransferableToCheck.isErr()) {
return ClipboardResultPromise::CreateAndReject(
singleTransferableToCheck.unwrapErr(), __func__);
}
// Pass nullptr for the window here because we will be doing
// content analysis ourselves asynchronously (so it doesn't block
// main thread we're running on now)
nsCOMPtr singleTransferable = singleTransferableToCheck.unwrap();
// Ideally we would be calling GetDataSnapshot() here to avoid blocking
// the main thread (and this would mean we could also pass in the window
// here so we wouldn't have to duplicate the Content Analysis code below).
// See bug 1908280.
nsresult rv =
clipboard->GetData(singleTransferable, aWhichClipboard, nullptr);
if (NS_FAILED(rv)) {
return ClipboardResultPromise::CreateAndReject(rv, __func__);
}
nsCOMPtr<nsISupports> data;
rv =
singleTransferable->GetTransferData(type.get(), getter_AddRefs(data));
// This call will fail if the data is null
if (NS_SUCCEEDED(rv)) {
rv = transferable->SetTransferData(type.get(), data);
if (NS_FAILED(rv)) {
return ClipboardResultPromise::CreateAndReject(rv, __func__);
}
}
}
} else {
// Pass nullptr for the window here because we will be doing
// content analysis ourselves asynchronously (so it doesn't block
// main thread we're running on now)
//
// Ideally we would be calling GetDataSnapshot() here to avoid blocking the
// main thread (and this would mean we could also pass in the window here so
// we wouldn't have to duplicate the Content Analysis code below). See
// bug 1908280.
nsresult rv = clipboard->GetData(transferable, aWhichClipboard, nullptr);
if (NS_FAILED(rv)) {
return ClipboardResultPromise::CreateAndReject(rv, __func__);
}
}
auto resultPromise = MakeRefPtr<ClipboardResultPromise::Private>(__func__);
auto contentAnalysisCallback =
mozilla::MakeRefPtr<mozilla::contentanalysis::ContentAnalysisCallback>(
[transferable, resultPromise,
cpHandle = RefPtr{aRequestingContentParent}](
nsIContentAnalysisResult* aResult) {
// Needed to call cpHandle->GetContentParent()
AssertIsOnMainThread();
if (!aResult->GetShouldAllowContent()) {
resultPromise->Reject(NS_ERROR_CONTENT_BLOCKED, __func__);
return;
}
dom::IPCTransferableData transferableData;
RefPtr<dom::ContentParent> contentParent =
cpHandle->GetContentParent();
nsContentUtils::TransferableToIPCTransferableData(
transferable, &transferableData, true /* aInSyncMessage */,
contentParent);
resultPromise->Resolve(std::move(transferableData), __func__);
});
contentanalysis::ContentAnalysis::CheckClipboardContentAnalysis(
static_cast<nsBaseClipboard*>(clipboard.get()), window, transferable,
aWhichClipboard, contentAnalysisCallback, aCheckAllContent);
return resultPromise;
}
} // namespace
ipc::IPCResult ClipboardContentAnalysisParent::GetSomeClipboardData(
nsTArray<nsCString>&& aTypes,
const nsIClipboard::ClipboardType& aWhichClipboard,
const uint64_t& aRequestingWindowContextId, bool aCheckAllContent,
IPCTransferableDataOrError* aTransferableDataOrError) {
Monitor mon("ClipboardContentAnalysisParent::GetSomeClipboardData");
InvokeAsync(GetMainThreadSerialEventTarget(), __func__,
[&]() {
return GetClipboardImpl(
aTypes, aWhichClipboard, aRequestingWindowContextId,
aCheckAllContent, mThreadsafeContentParentHandle);
})
->Then(GetMainThreadSerialEventTarget(), __func__,
[&](ClipboardResultPromise::ResolveOrRejectValue&& aResult) {
// Acquire the lock, pass the data back to the background
// thread, and notify the background thread that work is
// complete.
MonitorAutoLock lock(mon);
auto monitor = MakeScopeExit([&]() { mon.Notify(); });
if (aResult.IsReject()) {
*aTransferableDataOrError = aResult.RejectValue();
return;
}
if (aCheckAllContent) {
// Content Analysis succeeded on everything
// Just return the flavors that were asked for
IPCTransferableData analyzedData =
std::move(aResult.ResolveValue());
nsTArray<IPCTransferableDataItem> dataItems;
for (auto& item : analyzedData.items()) {
if (aTypes.Contains(item.flavor())) {
dataItems.AppendElement(std::move(item));
}
}
IPCTransferableData data(std::move(dataItems));
*aTransferableDataOrError = std::move(data);
} else {
*aTransferableDataOrError = std::move(aResult.ResolveValue());
}
});
{
MonitorAutoLock lock(mon);
while (aTransferableDataOrError->type() ==
IPCTransferableDataOrError::T__None) {
mon.Wait();
}
}
if (aTransferableDataOrError->type() ==
IPCTransferableDataOrError::Tnsresult) {
nsresult rv = aTransferableDataOrError->get_nsresult();
// don't show a warning if the content was just blocked
if (rv != NS_ERROR_CONTENT_BLOCKED) {
NS_WARNING(nsPrintfCString("ClipboardContentAnalysisParent::"
"GetSomeClipboardData got error %x",
static_cast<int>(rv))
.get());
}
}
return IPC_OK();
}
ipc::IPCResult ClipboardContentAnalysisParent::RecvGetClipboard(
nsTArray<nsCString>&& aTypes,
const nsIClipboard::ClipboardType& aWhichClipboard,
const uint64_t& aRequestingWindowContextId,
IPCTransferableDataOrError* aTransferableDataOrError) {
// The whole point of having this actor is that it runs on a background thread
// and so waiting for the content analysis result won't cause the main thread
// to use SpinEventLoopUntil() which can cause a shutdownhang per bug 1901197.
MOZ_ASSERT(!NS_IsMainThread());
return GetSomeClipboardData(
std::move(aTypes), aWhichClipboard, aRequestingWindowContextId,
/* aCheckAllContent */ false, aTransferableDataOrError);
}
ipc::IPCResult ClipboardContentAnalysisParent::RecvGetAllClipboardDataSync(
nsTArray<nsCString>&& aTypes,
const nsIClipboard::ClipboardType& aWhichClipboard,
const uint64_t& aRequestingWindowContextId,
IPCTransferableDataOrError* aTransferableDataOrError) {
MOZ_ASSERT(!NS_IsMainThread());
return GetSomeClipboardData(
std::move(aTypes), aWhichClipboard, aRequestingWindowContextId,
/* aCheckAllContent */ true, aTransferableDataOrError);
}
} // namespace mozilla
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