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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/binding_generating_native_handler.h"
- #include "extensions/renderer/script_context.h"
- #include "extensions/renderer/v8_helpers.h"
- #include "gin/data_object_builder.h"
- #include "v8/include/v8-context.h"
- #include "v8/include/v8-function.h"
- #include "v8/include/v8-microtask-queue.h"
- namespace extensions {
- using v8_helpers::GetProperty;
- BindingGeneratingNativeHandler::BindingGeneratingNativeHandler(
- ScriptContext* context,
- const std::string& api_name,
- const std::string& bind_to)
- : context_(context), api_name_(api_name), bind_to_(bind_to) {}
- void BindingGeneratingNativeHandler::Initialize() {}
- bool BindingGeneratingNativeHandler::IsInitialized() {
- // There's no initialization to do, so just always return true.
- return true;
- }
- v8::Local<v8::Object> BindingGeneratingNativeHandler::NewInstance() {
- // This long sequence of commands effectively runs the JavaScript code,
- // such that result[bind_to] is the compiled schema for |api_name|:
- //
- // var result = {};
- // result[bind_to] = require('binding').Binding.create(api_name).generate();
- // return result;
- //
- // Unfortunately using the v8 APIs makes that quite verbose.
- // Each stage is marked with the code it executes.
- v8::Isolate* isolate = context_->isolate();
- v8::EscapableHandleScope scope(isolate);
- // Convert |api_name| and |bind_to| into their v8::Strings to pass
- // through the v8 APIs.
- v8::Local<v8::String> v8_api_name;
- if (!v8_helpers::ToV8String(isolate, api_name_, &v8_api_name)) {
- NOTREACHED();
- return v8::Local<v8::Object>();
- }
- v8::Local<v8::Context> v8_context = context_->v8_context();
- // require('binding');
- v8::Local<v8::Object> binding_module;
- if (!context_->module_system()->Require("binding").ToLocal(&binding_module)) {
- NOTREACHED();
- return v8::Local<v8::Object>();
- }
- // require('binding').Binding;
- v8::Local<v8::Value> binding_value;
- v8::Local<v8::Object> binding;
- if (!GetProperty(v8_context, binding_module, "Binding", &binding_value) ||
- !binding_value->ToObject(v8_context).ToLocal(&binding)) {
- NOTREACHED();
- return v8::Local<v8::Object>();
- }
- // require('binding').Binding.create;
- v8::Local<v8::Value> create_binding_value;
- if (!GetProperty(v8_context, binding, "create", &create_binding_value) ||
- !create_binding_value->IsFunction()) {
- NOTREACHED();
- return v8::Local<v8::Object>();
- }
- v8::Local<v8::Function> create_binding =
- create_binding_value.As<v8::Function>();
- // require('Binding').Binding.create(api_name);
- v8::Local<v8::Object> binding_instance;
- {
- v8::Local<v8::Value> argv[] = {v8_api_name};
- v8::Local<v8::Value> binding_instance_value;
- v8::MicrotasksScope microtasks_scope(
- v8_context->GetIsolate(), v8::MicrotasksScope::kDoNotRunMicrotasks);
- // TODO(devlin): We should not be using v8::Function::Call() directly here.
- // Instead, we should use JSRunner once it's used outside native bindings.
- if (!create_binding->Call(v8_context, binding, std::size(argv), argv)
- .ToLocal(&binding_instance_value) ||
- !binding_instance_value->ToObject(v8_context)
- .ToLocal(&binding_instance)) {
- NOTREACHED();
- return v8::Local<v8::Object>();
- }
- }
- // require('binding').Binding.create(api_name).generate;
- v8::Local<v8::Value> generate_value;
- if (!GetProperty(v8_context, binding_instance, "generate", &generate_value) ||
- !generate_value->IsFunction()) {
- NOTREACHED();
- return v8::Local<v8::Object>();
- }
- v8::Local<v8::Function> generate = generate_value.As<v8::Function>();
- // require('binding').Binding.create(api_name).generate();
- v8::Local<v8::Value> compiled_schema;
- {
- v8::MicrotasksScope microtasks_scope(
- v8_context->GetIsolate(), v8::MicrotasksScope::kDoNotRunMicrotasks);
- // TODO(devlin): We should not be using v8::Function::Call() directly here.
- // Instead, we should use JSRunner once it's used outside native bindings.
- if (!generate->Call(v8_context, binding_instance, 0, nullptr)
- .ToLocal(&compiled_schema)) {
- NOTREACHED();
- return v8::Local<v8::Object>();
- }
- }
- // var result = {};
- // result[bind_to] = ...;
- v8::Local<v8::Object> object =
- gin::DataObjectBuilder(isolate).Set(bind_to_, compiled_schema).Build();
- // return result;
- return scope.Escape(object);
- }
- } // namespace extensions
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