Use V8 Maybe APIs in extensions/renderer

extensions/renderer/binding_generating_native_handler.cc

 // 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/module_system.h"
+#include "extensions/renderer/v8_maybe_helpers.h"
 
 namespace extensions {
 
 BindingGeneratingNativeHandler::BindingGeneratingNativeHandler(
     ModuleSystem* module_system,
     const std::string& api_name,
     const std::string& bind_to)
     : module_system_(module_system), api_name_(api_name), bind_to_(bind_to) {}
 
-v8::Local<v8::Object> BindingGeneratingNativeHandler::NewInstance() {
+v8::MaybeLocal<v8::Object> BindingGeneratingNativeHandler::NewInstance() {
+  if (api_name_.size() >= v8::String::kMaxLength ||
+      bind_to_.size() >= v8::String::kMaxLength)
+    return v8::MaybeLocal<v8::Object>();
+
   v8::Isolate* isolate = module_system_->GetIsolate();
   v8::EscapableHandleScope scope(isolate);
-  v8::Local<v8::Object> binding_module =
-      module_system_->Require("binding")->ToObject(isolate);
-  v8::Local<v8::Object> binding =
-      binding_module->Get(v8::String::NewFromUtf8(isolate, "Binding"))
-          ->ToObject(isolate);
+  v8::Local<v8::Context> context = isolate->GetCurrentContext();
+  v8::Local<v8::Object> binding_module;
+  if (!module_system_->Require("binding")->ToObject(context).ToLocal(
+          &binding_module))
+    return v8::MaybeLocal<v8::Object>();
+
+  v8::Local<v8::Value> binding_value;
+  v8::Local<v8::Object> binding;
+  if (!binding_module->Get(context, ToV8String(isolate, "Binding"))
+           .ToLocal(&binding_value) ||
+      !binding_value->ToObject(context).ToLocal(&binding))
+    return v8::MaybeLocal<v8::Object>();
+
+  v8::Local<v8::Value> create_binding_value;
+  if (!binding->Get(context, ToV8String(isolate, "create"))
+           .ToLocal(&create_binding_value) ||
+      !create_binding_value->IsFunction())
+    return v8::MaybeLocal<v8::Object>();
   v8::Local<v8::Function> create_binding =
-      binding->Get(v8::String::NewFromUtf8(isolate, "create"))
-          .As<v8::Function>();
-  v8::Local<v8::Value> argv[] = {
-      v8::String::NewFromUtf8(isolate, api_name_.c_str())};
-  v8::Local<v8::Object> binding_instance =
-      create_binding->Call(binding, arraysize(argv), argv)->ToObject(isolate);
-  v8::Local<v8::Function> generate =
-      binding_instance->Get(v8::String::NewFromUtf8(isolate, "generate"))
-          .As<v8::Function>();
+      create_binding_value.As<v8::Function>();
+
+  v8::Local<v8::Value> argv[] = {ToV8String(isolate, api_name_.c_str())};
+  v8::Local<v8::Value> binding_instance_value;
+  v8::Local<v8::Object> binding_instance;
+  if (!create_binding->Call(context, binding, arraysize(argv), argv)
+           .ToLocal(&binding_instance_value) ||
+      !binding_instance_value->ToObject(context).ToLocal(&binding_instance))
+    return v8::MaybeLocal<v8::Object>();
+
+  v8::Local<v8::Value> generate_value;
+  if (!binding_instance->Get(context, ToV8String(isolate, "generate"))
+           .ToLocal(&generate_value) ||
+      !generate_value->IsFunction())
+    return v8::MaybeLocal<v8::Object>();
+  v8::Local<v8::Function> generate = generate_value.As<v8::Function>();
+
   v8::Local<v8::Object> object = v8::Object::New(isolate);
-  v8::Local<v8::Value> compiled_schema =
-      generate->Call(binding_instance, 0, NULL);
-  if (!compiled_schema.IsEmpty()) {
-    object->Set(v8::String::NewFromUtf8(isolate, bind_to_.c_str()),
-                compiled_schema);
-  }
+  v8::Local<v8::Value> compiled_schema;
+  if (!generate->Call(context, binding_instance, 0, NULL)
+      .ToLocal(&compiled_schema))
+    return v8::MaybeLocal<v8::Object>();
+
+  SetProperty(context, object, ToV8String(isolate, bind_to_.c_str()),
+              compiled_schema);
   return scope.Escape(object);
 }
 
 }  // namespace extensions