extensions/renderer/utils_native_handler.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "extensions/renderer/utils_native_handler.h"
   6
   7 #include "base/strings/stringprintf.h"
   8 #include "extensions/renderer/script_context.h"
   9 #include "third_party/WebKit/public/web/WebScopedMicrotaskSuppression.h"
  10 #include "third_party/WebKit/public/web/WebSerializedScriptValue.h"
  11
  12 namespace extensions {
  13
  14 UtilsNativeHandler::UtilsNativeHandler(ScriptContext* context)
  15     : ObjectBackedNativeHandler(context) {
  16   RouteFunction("createClassWrapper",
  17                 base::Bind(&UtilsNativeHandler::CreateClassWrapper,
  18                            base::Unretained(this)));
  19   RouteFunction(
  20       "deepCopy",
  21       base::Bind(&UtilsNativeHandler::DeepCopy, base::Unretained(this)));
  22 }
  23
  24 UtilsNativeHandler::~UtilsNativeHandler() {}
  25
  26 void UtilsNativeHandler::CreateClassWrapper(
  27     const v8::FunctionCallbackInfo<v8::Value>& args) {
  28   CHECK_EQ(3, args.Length());
  29   CHECK(args[0]->IsString());
  30   std::string name = *v8::String::Utf8Value(args[0]);
  31   CHECK(args[1]->IsObject());
  32   v8::Local<v8::Object> cls = args[1].As<v8::Object>();
  33   CHECK(args[2]->IsObject() || args[2]->IsUndefined());
  34   v8::Local<v8::Value> superclass = args[2];
  35
  36   v8::HandleScope handle_scope(GetIsolate());
  37   // TODO(fsamuel): Consider moving the source wrapping to ModuleSystem.
  38   v8::Local<v8::String> source = v8::String::NewFromUtf8(
  39       GetIsolate(),
  40       base::StringPrintf(
  41           "(function($Object, $Function, privates, cls, superclass) {"
  42           "'use strict';\n"
  43           "  function %s() {\n"
  44           "    var privateObj = $Object.create(cls.prototype);\n"
  45           "    $Function.apply(cls, privateObj, arguments);\n"
  46           "    privateObj.wrapper = this;\n"
  47           "    privates(this).impl = privateObj;\n"
  48           "  };\n"
  49           "  if (superclass) {\n"
  50           "    %s.prototype = Object.create(superclass.prototype);\n"
  51           "  }\n"
  52           "  return %s;\n"
  53           "})",
  54           name.c_str(), name.c_str(), name.c_str()).c_str());
  55   v8::Local<v8::Value> func_as_value = context()->module_system()->RunString(
  56       source, v8::String::NewFromUtf8(GetIsolate(), name.c_str()));
  57   if (func_as_value.IsEmpty() || func_as_value->IsUndefined()) {
  58     args.GetReturnValue().SetUndefined();
  59     return;
  60   }
  61
  62   // TODO(fsamuel): Move privates from ModuleSystem to a shared location.
  63   v8::Local<v8::Object> natives(context()->module_system()->NewInstance());
  64   CHECK(!natives.IsEmpty());  // this can happen if v8 has issues
  65
  66   v8::Local<v8::Function> func = func_as_value.As<v8::Function>();
  67   v8::Local<v8::Value> func_args[] = {
  68       context()->safe_builtins()->GetObjekt(),
  69       context()->safe_builtins()->GetFunction(),
  70       natives->Get(v8::String::NewFromUtf8(GetIsolate(), "privates",
  71                                            v8::String::kInternalizedString)),
  72       cls,
  73       superclass};
  74   v8::Local<v8::Value> result;
  75   {
  76     v8::TryCatch try_catch;
  77     try_catch.SetCaptureMessage(true);
  78     result = context()->CallFunction(func, arraysize(func_args), func_args);
  79     if (try_catch.HasCaught()) {
  80       args.GetReturnValue().SetUndefined();
  81       return;
  82     }
  83   }
  84   args.GetReturnValue().Set(result);
  85 }
  86
  87 void UtilsNativeHandler::DeepCopy(
  88     const v8::FunctionCallbackInfo<v8::Value>& args) {
  89   CHECK_EQ(1, args.Length());
  90   args.GetReturnValue().Set(
  91       blink::WebSerializedScriptValue::serialize(args[0]).deserialize());
  92 }
  93
  94 }  // namespace extensions