/
atom_sandboxed_renderer_client.cc
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/
atom_sandboxed_renderer_client.cc
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// Copyright (c) 2016 GitHub, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.
#include "atom/renderer/atom_sandboxed_renderer_client.h"
#include "atom/common/api/api_messages.h"
#include "atom/common/api/atom_bindings.h"
#include "atom/common/application_info.h"
#include "atom/common/native_mate_converters/string16_converter.h"
#include "atom/common/native_mate_converters/value_converter.h"
#include "atom/common/node_bindings.h"
#include "atom/common/options_switches.h"
#include "atom/renderer/atom_render_frame_observer.h"
#include "base/base_paths.h"
#include "base/command_line.h"
#include "base/files/file_path.h"
#include "base/path_service.h"
#include "base/process/process_handle.h"
#include "content/public/renderer/render_frame.h"
#include "gin/converter.h"
#include "native_mate/dictionary.h"
#include "third_party/blink/public/web/blink.h"
#include "third_party/blink/public/web/web_document.h"
#include "atom/common/node_includes.h"
#include "third_party/electron_node/src/node_binding.h"
#include "third_party/electron_node/src/node_native_module.h"
namespace atom {
namespace {
const char kIpcKey[] = "ipcNative";
const char kModuleCacheKey[] = "native-module-cache";
bool IsDevTools(content::RenderFrame* render_frame) {
return render_frame->GetWebFrame()->GetDocument().Url().ProtocolIs(
"chrome-devtools");
}
bool IsDevToolsExtension(content::RenderFrame* render_frame) {
return render_frame->GetWebFrame()->GetDocument().Url().ProtocolIs(
"chrome-extension");
}
v8::Local<v8::Object> GetModuleCache(v8::Isolate* isolate) {
mate::Dictionary global(isolate, isolate->GetCurrentContext()->Global());
v8::Local<v8::Value> cache;
if (!global.GetHidden(kModuleCacheKey, &cache)) {
cache = v8::Object::New(isolate);
global.SetHidden(kModuleCacheKey, cache);
}
return cache->ToObject(isolate);
}
// adapted from node.cc
v8::Local<v8::Value> GetBinding(v8::Isolate* isolate,
v8::Local<v8::String> key,
mate::Arguments* margs) {
v8::Local<v8::Object> exports;
std::string module_key = gin::V8ToString(isolate, key);
mate::Dictionary cache(isolate, GetModuleCache(isolate));
if (cache.Get(module_key.c_str(), &exports)) {
return exports;
}
auto* mod = node::binding::get_builtin_module(module_key.c_str());
if (!mod) {
char errmsg[1024];
snprintf(errmsg, sizeof(errmsg), "No such module: %s", module_key.c_str());
margs->ThrowError(errmsg);
return exports;
}
exports = v8::Object::New(isolate);
DCHECK_EQ(mod->nm_register_func, nullptr);
DCHECK_NE(mod->nm_context_register_func, nullptr);
mod->nm_context_register_func(exports, v8::Null(isolate),
isolate->GetCurrentContext(), mod->nm_priv);
cache.Set(module_key.c_str(), exports);
return exports;
}
v8::Local<v8::Value> CreatePreloadScript(v8::Isolate* isolate,
v8::Local<v8::String> preloadSrc) {
return RendererClientBase::RunScript(isolate->GetCurrentContext(),
preloadSrc);
}
class AtomSandboxedRenderFrameObserver : public AtomRenderFrameObserver {
public:
AtomSandboxedRenderFrameObserver(content::RenderFrame* render_frame,
AtomSandboxedRendererClient* renderer_client)
: AtomRenderFrameObserver(render_frame, renderer_client),
renderer_client_(renderer_client) {}
protected:
void EmitIPCEvent(blink::WebLocalFrame* frame,
bool internal,
const std::string& channel,
const base::ListValue& args,
int32_t sender_id) override {
if (!frame)
return;
auto* isolate = blink::MainThreadIsolate();
v8::HandleScope handle_scope(isolate);
auto context = renderer_client_->GetContext(frame, isolate);
v8::Context::Scope context_scope(context);
v8::Local<v8::Value> argv[] = {mate::ConvertToV8(isolate, channel),
mate::ConvertToV8(isolate, args),
mate::ConvertToV8(isolate, sender_id)};
renderer_client_->InvokeIpcCallback(
context, internal ? "onInternalMessage" : "onMessage",
std::vector<v8::Local<v8::Value>>(argv, argv + node::arraysize(argv)));
}
private:
AtomSandboxedRendererClient* renderer_client_;
DISALLOW_COPY_AND_ASSIGN(AtomSandboxedRenderFrameObserver);
};
} // namespace
AtomSandboxedRendererClient::AtomSandboxedRendererClient() {
// Explicitly register electron's builtin modules.
NodeBindings::RegisterBuiltinModules();
metrics_ = base::ProcessMetrics::CreateCurrentProcessMetrics();
}
AtomSandboxedRendererClient::~AtomSandboxedRendererClient() {}
void AtomSandboxedRendererClient::InitializeBindings(
v8::Local<v8::Object> binding,
v8::Local<v8::Context> context) {
auto* isolate = context->GetIsolate();
mate::Dictionary b(isolate, binding);
b.SetMethod("get", GetBinding);
b.SetMethod("createPreloadScript", CreatePreloadScript);
mate::Dictionary process = mate::Dictionary::CreateEmpty(isolate);
b.Set("process", process);
AtomBindings::BindProcess(isolate, &process, metrics_.get());
process.Set("argv", base::CommandLine::ForCurrentProcess()->argv());
process.SetReadOnly("pid", base::GetCurrentProcId());
process.SetReadOnly("sandboxed", true);
process.SetReadOnly("type", "renderer");
// Pass in CLI flags needed to setup the renderer
base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
if (command_line->HasSwitch(switches::kGuestInstanceID))
b.Set(options::kGuestInstanceID,
command_line->GetSwitchValueASCII(switches::kGuestInstanceID));
}
void AtomSandboxedRendererClient::RenderFrameCreated(
content::RenderFrame* render_frame) {
new AtomSandboxedRenderFrameObserver(render_frame, this);
RendererClientBase::RenderFrameCreated(render_frame);
}
void AtomSandboxedRendererClient::RenderViewCreated(
content::RenderView* render_view) {
RendererClientBase::RenderViewCreated(render_view);
}
void AtomSandboxedRendererClient::DidCreateScriptContext(
v8::Handle<v8::Context> context,
content::RenderFrame* render_frame) {
RendererClientBase::DidCreateScriptContext(context, render_frame);
// Only allow preload for the main frame or
// For devtools we still want to run the preload_bundle script
if (!render_frame->IsMainFrame() && !IsDevTools(render_frame) &&
!IsDevToolsExtension(render_frame))
return;
// Wrap the bundle into a function that receives the binding object as
// argument.
auto* isolate = context->GetIsolate();
auto binding = v8::Object::New(isolate);
InitializeBindings(binding, context);
AddRenderBindings(isolate, binding);
std::vector<v8::Local<v8::String>> preload_bundle_params = {
node::FIXED_ONE_BYTE_STRING(isolate, "binding")};
std::vector<v8::Local<v8::Value>> preload_bundle_args = {binding};
node::per_process::native_module_loader.CompileAndCall(
isolate->GetCurrentContext(), "electron/js2c/preload_bundle",
&preload_bundle_params, &preload_bundle_args, nullptr);
}
void AtomSandboxedRendererClient::WillReleaseScriptContext(
v8::Handle<v8::Context> context,
content::RenderFrame* render_frame) {
// Only allow preload for the main frame
if (!render_frame->IsMainFrame())
return;
auto* isolate = context->GetIsolate();
v8::HandleScope handle_scope(isolate);
v8::Context::Scope context_scope(context);
InvokeIpcCallback(context, "onExit", std::vector<v8::Local<v8::Value>>());
}
void AtomSandboxedRendererClient::InvokeIpcCallback(
v8::Handle<v8::Context> context,
const std::string& callback_name,
std::vector<v8::Handle<v8::Value>> args) {
auto* isolate = context->GetIsolate();
auto binding_key = mate::ConvertToV8(isolate, kIpcKey)->ToString(isolate);
auto private_binding_key = v8::Private::ForApi(isolate, binding_key);
auto global_object = context->Global();
v8::Local<v8::Value> value;
if (!global_object->GetPrivate(context, private_binding_key).ToLocal(&value))
return;
if (value.IsEmpty() || !value->IsObject())
return;
auto binding = value->ToObject(isolate);
auto callback_key =
mate::ConvertToV8(isolate, callback_name)->ToString(isolate);
auto callback_value = binding->Get(callback_key);
DCHECK(callback_value->IsFunction()); // set by sandboxed_renderer/init.js
auto callback = v8::Handle<v8::Function>::Cast(callback_value);
ignore_result(callback->Call(context, binding, args.size(), args.data()));
}
} // namespace atom