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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE.Chromium file.
#include "renderer/web_channel_ipc_transport.h"
#include "content/public/renderer/render_frame.h"
#include "gin/arguments.h"
#include "gin/handle.h"
#include "gin/object_template_builder.h"
#include "gin/wrappable.h"
#include "third_party/blink/public/web/blink.h"
#include "third_party/blink/public/web/web_local_frame.h"
#include "third_party/blink/public/common/associated_interfaces/associated_interface_provider.h"
#include "third_party/blink/public/common/associated_interfaces/associated_interface_registry.h"
#include "v8/include/v8.h"
#include "qtwebengine/browser/qtwebchannel.mojom.h"
namespace QtWebEngineCore {
class WebChannelTransport : public gin::Wrappable<WebChannelTransport>
{
public:
static gin::WrapperInfo kWrapperInfo;
static void Install(blink::WebLocalFrame *frame, uint worldId);
static void Uninstall(blink::WebLocalFrame *frame, uint worldId);
private:
WebChannelTransport() {}
void NativeQtSendMessage(gin::Arguments *args);
// gin::WrappableBase
gin::ObjectTemplateBuilder GetObjectTemplateBuilder(v8::Isolate *isolate) override;
mojo::AssociatedRemote<qtwebchannel::mojom::WebChannelTransportHost> m_remote;
content::RenderFrame *m_renderFrame = nullptr;
};
gin::WrapperInfo WebChannelTransport::kWrapperInfo = { gin::kEmbedderNativeGin };
void WebChannelTransport::Install(blink::WebLocalFrame *frame, uint worldId)
{
v8::Isolate *isolate = blink::MainThreadIsolate();
v8::HandleScope handleScope(isolate);
v8::Local<v8::Context> context;
if (worldId == 0)
context = frame->MainWorldScriptContext();
else
context = frame->IsolatedWorldScriptContext(worldId);
if (context.IsEmpty())
return;
v8::Context::Scope contextScope(context);
gin::Handle<WebChannelTransport> transport = gin::CreateHandle(isolate, new WebChannelTransport);
if (transport.IsEmpty())
return;
v8::Local<v8::Object> global = context->Global();
v8::Local<v8::Object> qtObject;
qtObject = v8::Object::New(isolate);
global->CreateDataProperty(context,
gin::StringToSymbol(isolate, "qt"),
qtObject).Check();
qtObject->CreateDataProperty(context,
gin::StringToSymbol(isolate, "webChannelTransport"),
transport.ToV8()).Check();
}
void WebChannelTransport::Uninstall(blink::WebLocalFrame *frame, uint worldId)
{
v8::Isolate *isolate = blink::MainThreadIsolate();
v8::HandleScope handleScope(isolate);
v8::Local<v8::Context> context;
if (worldId == 0)
context = frame->MainWorldScriptContext();
else
context = frame->IsolatedWorldScriptContext(worldId);
if (context.IsEmpty())
return;
v8::Context::Scope contextScope(context);
v8::Local<v8::Object> global(context->Global());
v8::Local<v8::Value> qtObjectValue;
if (!global->Get(context, gin::StringToV8(isolate, "qt")).ToLocal(&qtObjectValue) || !qtObjectValue->IsObject())
return;
v8::Local<v8::Object> qtObject = v8::Local<v8::Object>::Cast(qtObjectValue);
qtObject->Delete(context, gin::StringToV8(isolate, "webChannelTransport")).Check();
}
void WebChannelTransport::NativeQtSendMessage(gin::Arguments *args)
{
blink::WebLocalFrame *frame = blink::WebLocalFrame::FrameForCurrentContext();
if (!frame || !frame->View())
return;
content::RenderFrame *renderFrame = content::RenderFrame::FromWebFrame(frame);
if (!renderFrame)
return;
v8::Local<v8::Value> jsonValue;
if (!args->GetNext(&jsonValue)) {
args->ThrowTypeError("Missing argument");
return;
}
v8::Isolate *isolate = blink::MainThreadIsolate();
v8::HandleScope handleScope(isolate);
if (!jsonValue->IsString()) {
args->ThrowTypeError("Expected string");
return;
}
v8::Local<v8::String> jsonString = v8::Local<v8::String>::Cast(jsonValue);
std::vector<uint8_t> json(jsonString->Utf8Length(isolate), 0);
jsonString->WriteUtf8(isolate, reinterpret_cast<char *>(json.data()), json.size(), nullptr,
v8::String::REPLACE_INVALID_UTF8);
if (!m_remote) {
renderFrame->GetRemoteAssociatedInterfaces()->GetInterface(&m_remote);
m_renderFrame = renderFrame;
}
DCHECK(renderFrame == m_renderFrame);
m_remote->DispatchWebChannelMessage(json);
}
gin::ObjectTemplateBuilder WebChannelTransport::GetObjectTemplateBuilder(v8::Isolate *isolate)
{
return gin::Wrappable<WebChannelTransport>::GetObjectTemplateBuilder(isolate).SetMethod(
"send", &WebChannelTransport::NativeQtSendMessage);
}
WebChannelIPCTransport::WebChannelIPCTransport(content::RenderFrame *renderFrame)
: content::RenderFrameObserver(renderFrame)
, m_worldId(0)
, m_worldInitialized(false)
, m_binding(this)
{
renderFrame->GetAssociatedInterfaceRegistry()->AddInterface<qtwebchannel::mojom::WebChannelTransportRender>(
base::BindRepeating(&WebChannelIPCTransport::BindReceiver, base::Unretained(this)));
}
void WebChannelIPCTransport::BindReceiver(
mojo::PendingAssociatedReceiver<qtwebchannel::mojom::WebChannelTransportRender> receiver)
{
m_binding.Bind(std::move(receiver));
}
void WebChannelIPCTransport::SetWorldId(uint32_t worldId)
{
if (m_worldInitialized && m_worldId == worldId)
return;
if (m_worldInitialized && m_canUseContext)
WebChannelTransport::Uninstall(render_frame()->GetWebFrame(), m_worldId);
m_worldInitialized = true;
m_worldId = worldId;
if (m_canUseContext)
WebChannelTransport::Install(render_frame()->GetWebFrame(), m_worldId);
}
void WebChannelIPCTransport::ResetWorldId()
{
if (m_worldInitialized && m_canUseContext)
WebChannelTransport::Uninstall(render_frame()->GetWebFrame(), m_worldId);
m_worldInitialized = false;
m_worldId = 0;
}
void WebChannelIPCTransport::DispatchWebChannelMessage(const std::vector<uint8_t> &json,
uint32_t worldId)
{
DCHECK(m_worldId == worldId);
if (!m_canUseContext)
return;
blink::WebLocalFrame *frame = render_frame()->GetWebFrame();
v8::Isolate *isolate = blink::MainThreadIsolate();
v8::HandleScope handleScope(isolate);
v8::Local<v8::Context> context;
if (worldId == 0)
context = frame->MainWorldScriptContext();
else
context = frame->IsolatedWorldScriptContext(worldId);
v8::Context::Scope contextScope(context);
v8::Local<v8::Object> global(context->Global());
v8::Local<v8::Value> qtObjectValue;
if (!global->Get(context, gin::StringToV8(isolate, "qt")).ToLocal(&qtObjectValue) || !qtObjectValue->IsObject())
return;
v8::Local<v8::Object> qtObject = v8::Local<v8::Object>::Cast(qtObjectValue);
v8::Local<v8::Value> webChannelObjectValue;
if (!qtObject->Get(context, gin::StringToV8(isolate, "webChannelTransport")).ToLocal(&webChannelObjectValue)
|| !webChannelObjectValue->IsObject())
return;
v8::Local<v8::Object> webChannelObject = v8::Local<v8::Object>::Cast(webChannelObjectValue);
v8::Local<v8::Value> callbackValue;
if (!webChannelObject->Get(context, gin::StringToV8(isolate, "onmessage")).ToLocal(&callbackValue)
|| !callbackValue->IsFunction()) {
LOG(WARNING) << "onmessage is not a callable property of qt.webChannelTransport. Some things might not work as "
"expected.";
return;
}
v8::Local<v8::Object> messageObject(v8::Object::New(isolate));
v8::Maybe<bool> wasSet = messageObject->DefineOwnProperty(
context, v8::String::NewFromUtf8(isolate, "data").ToLocalChecked(),
v8::String::NewFromUtf8(isolate, reinterpret_cast<const char *>(json.data()),
v8::NewStringType::kNormal, json.size())
.ToLocalChecked(),
v8::PropertyAttribute(v8::ReadOnly | v8::DontDelete));
DCHECK(!wasSet.IsNothing() && wasSet.FromJust());
v8::Local<v8::Function> callback = v8::Local<v8::Function>::Cast(callbackValue);
v8::Local<v8::Value> argv[] = { messageObject };
frame->CallFunctionEvenIfScriptDisabled(callback, webChannelObject, 1, argv);
}
void WebChannelIPCTransport::DidCreateScriptContext(v8::Local<v8::Context> context, int32_t worldId)
{
if (static_cast<uint>(worldId) == m_worldId && !m_canUseContext) {
m_canUseContext = true;
if (m_worldInitialized)
WebChannelTransport::Install(render_frame()->GetWebFrame(), m_worldId);
}
}
void WebChannelIPCTransport::WillReleaseScriptContext(v8::Local<v8::Context> context, int worldId)
{
if (static_cast<uint>(worldId) == m_worldId)
m_canUseContext = false;
}
void WebChannelIPCTransport::OnDestruct()
{
delete this;
}
} // namespace QtWebEngineCore
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