blob: 005e2cacb2bae5f726703a3c25a94e70d1dfb508 [file] [log] [blame]
// Copyright 2019 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 file.
#include "chromecast/renderer/native_bindings_helper.h"
#include "base/logging.h"
#include "content/public/renderer/render_frame.h"
#include "gin/converter.h"
#include "third_party/blink/public/web/blink.h"
#include "third_party/blink/public/web/web_local_frame.h"
namespace chromecast {
namespace {
const char kCastObjectName[] = "cast";
const char kCastPlatformObjectKey[] = "__platform__";
} // namespace
v8::Local<v8::Object> GetOrCreateCastPlatformObject(
v8::Isolate* isolate,
v8::Local<v8::Object> global) {
v8::Local<v8::Object> cast =
EnsureObjectExists(isolate, global, kCastObjectName);
return EnsureObjectExists(isolate, cast, kCastPlatformObjectKey);
}
v8::Local<v8::Object> EnsureObjectExists(v8::Isolate* isolate,
v8::Local<v8::Object> parent,
const std::string& key) {
v8::Local<v8::Context> context = isolate->GetCurrentContext();
v8::MaybeLocal<v8::Value> child =
parent->Get(context, gin::StringToV8(isolate, key));
v8::Local<v8::Value> child_local;
v8::Local<v8::Object> child_object;
if (child.ToLocal(&child_local) && child_local->IsObject() &&
child_local->ToObject(context).ToLocal(&child_object))
return child_object;
if (!child_local.IsEmpty() && !child_local->IsUndefined())
LOG(WARNING) << "Overwriting non-empty non-object with key " << key;
v8::Local<v8::Object> new_child_object = v8::Object::New(isolate);
v8::Maybe<bool> result =
parent->Set(context, gin::StringToSymbol(isolate, key), new_child_object);
if (result.IsNothing() || !result.FromJust())
LOG(ERROR) << "Failed to set new object with key " << key;
return new_child_object;
}
CastBinding::CastBinding(content::RenderFrame* render_frame)
: content::RenderFrameObserver(render_frame) {}
CastBinding::~CastBinding() {}
void CastBinding::DidClearWindowObject() {
TryInstall();
}
void CastBinding::OnDestruct() {
delete this;
}
void CastBinding::TryInstall() {
blink::WebLocalFrame* web_frame = render_frame()->GetWebFrame();
if (!web_frame)
return;
v8::Isolate* isolate = blink::MainThreadIsolate();
if (!isolate)
return;
v8::MicrotasksScope microtasks(isolate,
v8::MicrotasksScope::kDoNotRunMicrotasks);
v8::HandleScope handle_scope(isolate);
v8::Local<v8::Context> context = web_frame->MainWorldScriptContext();
if (context.IsEmpty())
return;
v8::Context::Scope context_scope(context);
v8::Local<v8::Object> global = context->Global();
v8::Local<v8::Object> cast_platform =
GetOrCreateCastPlatformObject(isolate, global);
Install(cast_platform, isolate);
}
} // namespace chromecast