[Extensions Bindings] Add APIBindingsSystem

extensions/renderer/api_bindings_system.cc

+// Copyright 2016 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/api_bindings_system.h"
+
+#include "base/bind.h"
+#include "base/memory/ptr_util.h"
+#include "base/values.h"
+#include "extensions/renderer/api_binding.h"
+
+namespace extensions {
+
+APIBindingsSystem::Request::Request() {}
+APIBindingsSystem::Request::~Request() {}
+
+APIBindingsSystem::APIBindingsSystem(
+    const APIRequestHandler::CallJSFunction& call_js,
+    const GetAPISchemaMethod& get_api_schema,
+    const SendRequestMethod& send_request)
+    : request_handler_(call_js),
+      get_api_schema_(get_api_schema),
+      send_request_(send_request) {}
+
+APIBindingsSystem::~APIBindingsSystem() {}
+
+v8::Local<v8::Object> APIBindingsSystem::CreateAPIInstance(
+    const std::string& api_name,
+    v8::Local<v8::Context> context,
+    v8::Isolate* isolate) {
+  std::unique_ptr<APIBinding>& binding = api_bindings_[api_name];
+  if (!binding)
+    binding = CreateNewAPIBinding(api_name);
+  return binding->CreateInstance(context, isolate);
+}
+
+std::unique_ptr<APIBinding> APIBindingsSystem::CreateNewAPIBinding(
+    const std::string& api_name) {
+  const base::DictionaryValue& api_schema = get_api_schema_.Run(api_name);
+
+  const base::ListValue* function_definitions = nullptr;
+  CHECK(api_schema.GetList("functions", &function_definitions));
+  const base::ListValue* type_definitions = nullptr;
+  // Type definitions might not exist for the given API.
+  api_schema.GetList("types", &type_definitions);
+
+  return base::MakeUnique<APIBinding>(
+      api_name, *function_definitions, type_definitions,
+      base::Bind(&APIBindingsSystem::OnAPICall, base::Unretained(this)),
+      &type_reference_map_);
+}
+
+void APIBindingsSystem::CompleteRequest(const std::string& request_id,
+                                        const base::ListValue& response) {
+  request_handler_.CompleteRequest(request_id, response);
+}
+
+void APIBindingsSystem::OnAPICall(const std::string& name,
+                                  std::unique_ptr<base::ListValue> arguments,
+                                  v8::Isolate* isolate,
+                                  v8::Local<v8::Context> context,
+                                  v8::Local<v8::Function> callback) {
+  auto request = base::MakeUnique<Request>();
+  if (!callback.IsEmpty()) {
+    request->request_id =
+        request_handler_.AddPendingRequest(isolate, callback, context);
+  }
+  request->arguments = std::move(arguments);
+  request->method_name = name;
+
+  send_request_.Run(std::move(request));
+}
+
+}  // namespace extensions