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// Copyright 2014 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 "extensions/renderer/object_backed_native_handler.h"
#include <stddef.h>
#include "base/logging.h"
#include "base/memory/linked_ptr.h"
#include "extensions/renderer/console.h"
#include "extensions/renderer/module_system.h"
#include "extensions/renderer/script_context.h"
#include "extensions/renderer/script_context_set.h"
#include "v8/include/v8.h"
namespace extensions {
namespace {
// Key for the base::Bound routed function.
const char* kHandlerFunction = "handler_function";
} // namespace
ObjectBackedNativeHandler::ObjectBackedNativeHandler(ScriptContext* context)
: router_data_(context->isolate()),
context_(context),
object_template_(context->isolate(),
v8::ObjectTemplate::New(context->isolate())) {
}
ObjectBackedNativeHandler::~ObjectBackedNativeHandler() {
}
v8::Local<v8::Object> ObjectBackedNativeHandler::NewInstance() {
return v8::Local<v8::ObjectTemplate>::New(GetIsolate(), object_template_)
->NewInstance();
}
// static
void ObjectBackedNativeHandler::Router(
const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
v8::HandleScope handle_scope(isolate);
v8::Local<v8::Object> data = args.Data().As<v8::Object>();
v8::Local<v8::Context> context = isolate->GetCurrentContext();
v8::Local<v8::Value> handler_function_value;
// See comment in header file for why we do this.
if (!GetPrivate(context, data, kHandlerFunction, &handler_function_value) ||
handler_function_value->IsUndefined()) {
ScriptContext* script_context =
ScriptContextSet::GetContextByV8Context(context);
console::Error(script_context ? script_context->GetRenderFrame() : nullptr,
"Extension view no longer exists");
return;
}
// This CHECK is *important*. Otherwise, we'll go around happily executing
// something random. See crbug.com/548273.
CHECK(handler_function_value->IsExternal());
static_cast<HandlerFunction*>(
handler_function_value.As<v8::External>()->Value())->Run(args);
}
void ObjectBackedNativeHandler::RouteFunction(
const std::string& name,
const HandlerFunction& handler_function) {
v8::Isolate* isolate = v8::Isolate::GetCurrent();
v8::HandleScope handle_scope(isolate);
v8::Context::Scope context_scope(context_->v8_context());
v8::Local<v8::Object> data = v8::Object::New(isolate);
SetPrivate(data, kHandlerFunction,
v8::External::New(isolate, new HandlerFunction(handler_function)));
v8::Local<v8::FunctionTemplate> function_template =
v8::FunctionTemplate::New(isolate, Router, data);
v8::Local<v8::ObjectTemplate>::New(isolate, object_template_)
->Set(isolate, name.c_str(), function_template);
router_data_.Append(data);
}
v8::Isolate* ObjectBackedNativeHandler::GetIsolate() const {
return context_->isolate();
}
void ObjectBackedNativeHandler::Invalidate() {
v8::Isolate* isolate = GetIsolate();
v8::HandleScope handle_scope(isolate);
v8::Context::Scope context_scope(context_->v8_context());
for (size_t i = 0; i < router_data_.Size(); i++) {
v8::Local<v8::Object> data = router_data_.Get(i);
v8::Local<v8::Value> handler_function_value;
CHECK(GetPrivate(data, kHandlerFunction, &handler_function_value));
delete static_cast<HandlerFunction*>(
handler_function_value.As<v8::External>()->Value());
DeletePrivate(data, kHandlerFunction);
}
router_data_.Clear();
object_template_.Reset();
NativeHandler::Invalidate();
}
void ObjectBackedNativeHandler::SetPrivate(v8::Local<v8::Object> obj,
const char* key,
v8::Local<v8::Value> value) {
SetPrivate(context_->v8_context(), obj, key, value);
}
// static
void ObjectBackedNativeHandler::SetPrivate(v8::Local<v8::Context> context,
v8::Local<v8::Object> obj,
const char* key,
v8::Local<v8::Value> value) {
obj->SetPrivate(context, v8::Private::ForApi(context->GetIsolate(),
v8::String::NewFromUtf8(
context->GetIsolate(), key)),
value)
.FromJust();
}
bool ObjectBackedNativeHandler::GetPrivate(v8::Local<v8::Object> obj,
const char* key,
v8::Local<v8::Value>* result) {
return GetPrivate(context_->v8_context(), obj, key, result);
}
// static
bool ObjectBackedNativeHandler::GetPrivate(v8::Local<v8::Context> context,
v8::Local<v8::Object> obj,
const char* key,
v8::Local<v8::Value>* result) {
return obj->GetPrivate(context,
v8::Private::ForApi(context->GetIsolate(),
v8::String::NewFromUtf8(
context->GetIsolate(), key)))
.ToLocal(result);
}
void ObjectBackedNativeHandler::DeletePrivate(v8::Local<v8::Object> obj,
const char* key) {
DeletePrivate(context_->v8_context(), obj, key);
}
// static
void ObjectBackedNativeHandler::DeletePrivate(v8::Local<v8::Context> context,
v8::Local<v8::Object> obj,
const char* key) {
obj->DeletePrivate(context,
v8::Private::ForApi(
context->GetIsolate(),
v8::String::NewFromUtf8(context->GetIsolate(), key)))
.FromJust();
}
} // namespace extensions
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