/
electron_renderer_client.cc
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/
electron_renderer_client.cc
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// Copyright (c) 2013 GitHub, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.
#include "shell/renderer/electron_renderer_client.h"
#include <string>
#include "base/command_line.h"
#include "content/public/renderer/render_frame.h"
#include "electron/buildflags/buildflags.h"
#include "net/http/http_request_headers.h"
#include "shell/common/api/electron_bindings.h"
#include "shell/common/gin_helper/dictionary.h"
#include "shell/common/gin_helper/event_emitter_caller.h"
#include "shell/common/node_bindings.h"
#include "shell/common/node_includes.h"
#include "shell/common/options_switches.h"
#include "shell/renderer/electron_render_frame_observer.h"
#include "shell/renderer/web_worker_observer.h"
#include "third_party/blink/public/common/web_preferences/web_preferences.h"
#include "third_party/blink/public/web/web_document.h"
#include "third_party/blink/public/web/web_local_frame.h"
namespace electron {
namespace {
bool IsDevToolsExtension(content::RenderFrame* render_frame) {
return static_cast<GURL>(render_frame->GetWebFrame()->GetDocument().Url())
.SchemeIs("chrome-extension");
}
} // namespace
ElectronRendererClient::ElectronRendererClient()
: node_bindings_(
NodeBindings::Create(NodeBindings::BrowserEnvironment::kRenderer)),
electron_bindings_(
std::make_unique<ElectronBindings>(node_bindings_->uv_loop())) {}
ElectronRendererClient::~ElectronRendererClient() = default;
void ElectronRendererClient::RenderFrameCreated(
content::RenderFrame* render_frame) {
new ElectronRenderFrameObserver(render_frame, this);
RendererClientBase::RenderFrameCreated(render_frame);
}
void ElectronRendererClient::RunScriptsAtDocumentStart(
content::RenderFrame* render_frame) {
RendererClientBase::RunScriptsAtDocumentStart(render_frame);
// Inform the document start pharse.
v8::HandleScope handle_scope(v8::Isolate::GetCurrent());
node::Environment* env = GetEnvironment(render_frame);
if (env)
gin_helper::EmitEvent(env->isolate(), env->process_object(),
"document-start");
}
void ElectronRendererClient::RunScriptsAtDocumentEnd(
content::RenderFrame* render_frame) {
RendererClientBase::RunScriptsAtDocumentEnd(render_frame);
// Inform the document end pharse.
v8::HandleScope handle_scope(v8::Isolate::GetCurrent());
node::Environment* env = GetEnvironment(render_frame);
if (env)
gin_helper::EmitEvent(env->isolate(), env->process_object(),
"document-end");
}
void ElectronRendererClient::DidCreateScriptContext(
v8::Handle<v8::Context> renderer_context,
content::RenderFrame* render_frame) {
// TODO(zcbenz): Do not create Node environment if node integration is not
// enabled.
// Only load Node.js if we are a main frame or a devtools extension
// unless Node.js support has been explicitly enabled for subframes.
auto prefs = render_frame->GetBlinkPreferences();
bool is_main_frame = render_frame->IsMainFrame();
bool is_devtools = IsDevToolsExtension(render_frame);
bool allow_node_in_subframes = prefs.node_integration_in_sub_frames;
bool should_load_node =
(is_main_frame || is_devtools || allow_node_in_subframes) &&
!IsWebViewFrame(renderer_context, render_frame);
if (!should_load_node)
return;
injected_frames_.insert(render_frame);
if (!node_integration_initialized_) {
node_integration_initialized_ = true;
node_bindings_->Initialize();
node_bindings_->PrepareMessageLoop();
} else {
node_bindings_->PrepareMessageLoop();
}
// Setup node tracing controller.
if (!node::tracing::TraceEventHelper::GetAgent())
node::tracing::TraceEventHelper::SetAgent(node::CreateAgent());
// Setup node environment for each window.
bool initialized = node::InitializeContext(renderer_context);
CHECK(initialized);
node::Environment* env =
node_bindings_->CreateEnvironment(renderer_context, nullptr);
// If we have disabled the site instance overrides we should prevent loading
// any non-context aware native module.
env->options()->force_context_aware = true;
// We do not want to crash the renderer process on unhandled rejections.
env->options()->unhandled_rejections = "warn";
environments_.insert(env);
// Add Electron extended APIs.
electron_bindings_->BindTo(env->isolate(), env->process_object());
gin_helper::Dictionary process_dict(env->isolate(), env->process_object());
BindProcess(env->isolate(), &process_dict, render_frame);
// Load everything.
node_bindings_->LoadEnvironment(env);
if (node_bindings_->uv_env() == nullptr) {
// Make uv loop being wrapped by window context.
node_bindings_->set_uv_env(env);
// Give the node loop a run to make sure everything is ready.
node_bindings_->RunMessageLoop();
}
}
void ElectronRendererClient::WillReleaseScriptContext(
v8::Handle<v8::Context> context,
content::RenderFrame* render_frame) {
if (injected_frames_.erase(render_frame) == 0)
return;
node::Environment* env = node::Environment::GetCurrent(context);
if (environments_.erase(env) == 0)
return;
gin_helper::EmitEvent(env->isolate(), env->process_object(), "exit");
// The main frame may be replaced.
if (env == node_bindings_->uv_env())
node_bindings_->set_uv_env(nullptr);
// Destroying the node environment will also run the uv loop,
// Node.js expects `kExplicit` microtasks policy and will run microtasks
// checkpoints after every call into JavaScript. Since we use a different
// policy in the renderer - switch to `kExplicit` and then drop back to the
// previous policy value.
v8::Isolate* isolate = context->GetIsolate();
auto old_policy = isolate->GetMicrotasksPolicy();
DCHECK_EQ(v8::MicrotasksScope::GetCurrentDepth(isolate), 0);
isolate->SetMicrotasksPolicy(v8::MicrotasksPolicy::kExplicit);
node::FreeEnvironment(env);
if (env == node_bindings_->uv_env())
node::FreeIsolateData(node_bindings_->isolate_data());
isolate->SetMicrotasksPolicy(old_policy);
// ElectronBindings is tracking node environments.
electron_bindings_->EnvironmentDestroyed(env);
}
void ElectronRendererClient::WorkerScriptReadyForEvaluationOnWorkerThread(
v8::Local<v8::Context> context) {
// TODO(loc): Note that this will not be correct for in-process child windows
// with webPreferences that have a different value for nodeIntegrationInWorker
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kNodeIntegrationInWorker)) {
WebWorkerObserver::GetCurrent()->WorkerScriptReadyForEvaluation(context);
}
}
void ElectronRendererClient::WillDestroyWorkerContextOnWorkerThread(
v8::Local<v8::Context> context) {
// TODO(loc): Note that this will not be correct for in-process child windows
// with webPreferences that have a different value for nodeIntegrationInWorker
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kNodeIntegrationInWorker)) {
WebWorkerObserver::GetCurrent()->ContextWillDestroy(context);
}
}
node::Environment* ElectronRendererClient::GetEnvironment(
content::RenderFrame* render_frame) const {
if (injected_frames_.find(render_frame) == injected_frames_.end())
return nullptr;
v8::HandleScope handle_scope(v8::Isolate::GetCurrent());
auto context =
GetContext(render_frame->GetWebFrame(), v8::Isolate::GetCurrent());
node::Environment* env = node::Environment::GetCurrent(context);
if (environments_.find(env) == environments_.end())
return nullptr;
return env;
}
} // namespace electron