[Extensions Bindings] Introduce BindingAccessChecker

extensions/renderer/binding_access_checker_unittest.cc

+// Copyright 2017 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_access_checker.h"
+
+#include "base/bind.h"
+#include "extensions/renderer/api_binding_test.h"
+#include "gin/converter.h"
+
+namespace extensions {
+
+namespace {
+
+bool IsAvailable(v8::Local<v8::Context> context, const std::string& full_name) {
+  EXPECT_TRUE(full_name == "available" || full_name == "unavailable")
+      << full_name;
+  return full_name == "available";
+}
+
+}  // namespace
+
+using BindingAccessCheckerTest = APIBindingTest;
+
+TEST_F(BindingAccessCheckerTest, TestHasAccess) {
+  v8::HandleScope handle_scope(isolate());
+
+  BindingAccessChecker checker(base::Bind(&IsAvailable));
+
+  v8::Local<v8::Context> context = MainContext();
+  EXPECT_TRUE(checker.HasAccess(context, "available"));
+  EXPECT_FALSE(checker.HasAccess(context, "unavailable"));
+}
+
+TEST_F(BindingAccessCheckerTest, TestHasAccessOrThrowError) {
+  v8::HandleScope handle_scope(isolate());
+
+  BindingAccessChecker checker(base::Bind(&IsAvailable));
+
+  v8::Local<v8::Context> context = MainContext();
+  {
+    v8::TryCatch try_catch(isolate());
+    EXPECT_TRUE(checker.HasAccessOrThrowError(context, "available"));
+    EXPECT_FALSE(try_catch.HasCaught());
+  }
+
+  {
+    v8::TryCatch try_catch(isolate());
+    EXPECT_FALSE(checker.HasAccessOrThrowError(context, "unavailable"));
+    ASSERT_TRUE(try_catch.HasCaught());
+    EXPECT_EQ("Uncaught Error: 'unavailable' is not available in this context.",
+              gin::V8ToString(try_catch.Message()->Get()));
+  }
+}
+
+}  // namespace extensions