[Extensions Bindings] Add APIBindingsSystem

extensions/renderer/api_bindings_system_unittest.cc

Index: extensions/renderer/api_bindings_system_unittest.cc
diff --git a/extensions/renderer/api_bindings_system_unittest.cc b/extensions/renderer/api_bindings_system_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..43f8b58d64a6c2d14aca69c59de1b1fe9c80652b
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+++ b/extensions/renderer/api_bindings_system_unittest.cc
@@ -0,0 +1,442 @@
+// 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/macros.h"
+#include "base/memory/ptr_util.h"
+#include "base/stl_util.h"
+#include "base/strings/stringprintf.h"
+#include "base/values.h"
+#include "extensions/common/extension_api.h"
+#include "extensions/renderer/api_binding.h"
+#include "extensions/renderer/api_binding_test_util.h"
+#include "extensions/renderer/api_request_handler.h"
+#include "gin/converter.h"
+#include "gin/public/context_holder.h"
+#include "gin/public/isolate_holder.h"
+#include "gin/test/v8_test.h"
+#include "gin/try_catch.h"
+
+namespace extensions {
+
+namespace {
+
+// Fake API for testing.
+const char kAlphaAPIName[] = "alpha";
+const char kAlphaAPISpec[] =
+    "{"
+    "  'types': [{"
+    "    'id': 'objRef',"
+    "    'type': 'object',"
+    "    'properties': {"
+    "      'prop1': {'type': 'string'},"
+    "      'prop2': {'type': 'integer', 'optional': true}"
+    "    }"
+    "  }],"
+    "  'functions': [{"
+    "    'name': 'functionWithCallback',"
+    "    'parameters': [{"
+    "      'name': 'str',"
+    "      'type': 'string'"
+    "    }, {"
+    "      'name': 'callback',"
+    "      'type': 'function'"
+    "    }]"
+    "  }, {"
+    "    'name': 'functionWithRefAndCallback',"
+    "    'parameters': [{"
+    "      'name': 'ref',"
+    "      '$ref': 'objRef'"
+    "    }, {"
+    "      'name': 'callback',"
+    "      'type': 'function'"
+    "    }]"
+    "  }]"
+    "}";
+
+// Another fake API for testing.
+const char kBetaAPIName[] = "beta";
+const char kBetaAPISpec[] =
+    "{"
+    "  'functions': [{"
+    "    'name': 'simpleFunc',"
+    "    'parameters': [{'name': 'int', 'type': 'integer'}]"
+    "  }]"
+    "}";
+
+// Runs the given |function| on the |context|'s Global object.
+void RunJSFunction(v8::Local<v8::Function> function,
+                   v8::Local<v8::Context> context,
+                   int argc,
+                   v8::Local<v8::Value> argv[]) {
+  function->Call(context->Global(), argc, argv);
+}
+
+}  // namespace
+
+// The base class to test the APIBindingsSystem. This allows subclasses to
+// retrieve API schemas differently.
+class APIBindingsSystemTestBase : public gin::V8Test {
+ public:
+  // Returns the DictionaryValue representing the schema with the given API
+  // name.
+  virtual const base::DictionaryValue& GetAPISchema(
+      const std::string& api_name) = 0;
+
+  // Stores the request in |last_request_|.
+  void OnAPIRequest(std::unique_ptr<APIBindingsSystem::Request> request) {
+    ASSERT_FALSE(last_request_);
+    last_request_ = std::move(request);
+  }
+
+ protected:
+  APIBindingsSystemTestBase() {}
+  void SetUp() override;
+
+  void TearDown() override {
+    bindings_system_.reset();
+    holder_.reset();
+    gin::V8Test::TearDown();
+  }
+
+  // Checks that |last_request_| exists and was provided with the
+  // |expected_name| and |expected_arguments|.
+  void ValidateLastRequest(const std::string& expected_name,
+                           const std::string& expected_arguments);
+
+  const APIBindingsSystem::Request* last_request() const {
+    return last_request_.get();
+  }
+  void reset_last_request() { last_request_.reset(); }
+  APIBindingsSystem* bindings_system() { return bindings_system_.get(); }
+
+ private:
+  std::unique_ptr<gin::ContextHolder> holder_;
+
+  // The APIBindingsSystem associated with the test. Safe to use across multiple
+  // contexts.
+  std::unique_ptr<APIBindingsSystem> bindings_system_;
+
+  // The last request to be received from the APIBindingsSystem, or null if
+  // there is none.
+  std::unique_ptr<APIBindingsSystem::Request> last_request_;
+
+  DISALLOW_COPY_AND_ASSIGN(APIBindingsSystemTestBase);
+};
+
+void APIBindingsSystemTestBase::SetUp() {
+  gin::V8Test::SetUp();
+  v8::HandleScope handle_scope(instance_->isolate());
+  holder_ = base::MakeUnique<gin::ContextHolder>(instance_->isolate());
+  holder_->SetContext(
+      v8::Local<v8::Context>::New(instance_->isolate(), context_));
+
+  auto request_handler =
+      base::MakeUnique<APIRequestHandler>(base::Bind(&RunJSFunction));
+  bindings_system_ = base::MakeUnique<APIBindingsSystem>(
+      std::move(request_handler),
+      base::Bind(&APIBindingsSystemTestBase::GetAPISchema,
+                 base::Unretained(this)),
+      base::Bind(&APIBindingsSystemTestBase::OnAPIRequest,
+                 base::Unretained(this)));
+}
+
+void APIBindingsSystemTestBase::ValidateLastRequest(
+    const std::string& expected_name,
+    const std::string& expected_arguments) {
+  ASSERT_TRUE(last_request());
+  // Note that even if no arguments are provided by the API call, we should have
+  // an empty list.
+  ASSERT_TRUE(last_request()->arguments);
+  EXPECT_EQ(expected_name, last_request()->method_name);
+  EXPECT_EQ(ReplaceSingleQuotes(expected_arguments),
+            ValueToString(*last_request()->arguments));
+}
+
+// An implementation that works with fake/supplied APIs, for easy testability.
+class APIBindingsSystemTest : public APIBindingsSystemTestBase {
+ protected:
+  APIBindingsSystemTest() {}
+
+  // Calls a function constructed from |script_source| on the given |object|.
+  void CallFunctionOnObject(v8::Local<v8::Context> context,
+                            v8::Local<v8::Object> object,
+                            const std::string& script_source);
+
+ private:
+  const base::DictionaryValue& GetAPISchema(
+      const std::string& api_name) override {
+    EXPECT_TRUE(base::ContainsKey(api_schemas_, api_name));
+    return *api_schemas_[api_name];
+  }
+  void SetUp() override;
+
+  // The API schemas for the fake APIs.
+  std::map<std::string, std::unique_ptr<base::DictionaryValue>> api_schemas_;
+
+  DISALLOW_COPY_AND_ASSIGN(APIBindingsSystemTest);
+};
+
+void APIBindingsSystemTest::CallFunctionOnObject(
+    v8::Local<v8::Context> context,
+    v8::Local<v8::Object> object,
+    const std::string& script_source) {
+  std::string wrapped_script_source =
+      base::StringPrintf("(function(obj) { %s })", script_source.c_str());
+  v8::Isolate* isolate = instance_->isolate();
+
+  v8::Local<v8::Function> func =
+      FunctionFromString(context, wrapped_script_source);
+  ASSERT_FALSE(func.IsEmpty());
+
+  v8::TryCatch try_catch(isolate);
+  v8::Local<v8::Value> argv[] = {object};
+  func->Call(v8::Undefined(isolate), 1, argv);
+  EXPECT_FALSE(try_catch.HasCaught())
+      << gin::V8ToString(try_catch.Message()->Get());
+}
+
+void APIBindingsSystemTest::SetUp() {
+  APIBindingsSystemTestBase::SetUp();
+
+  // Create the fake API schemas.
+  {
+    struct APIData {
+      const char* name;
+      const char* spec;
+    } api_data[] = {
+        {kAlphaAPIName, kAlphaAPISpec}, {kBetaAPIName, kBetaAPISpec},
+    };
+    for (const auto& api : api_data) {
+      std::unique_ptr<base::DictionaryValue> api_schema =
+          DictionaryValueFromString(api.spec);
+      ASSERT_TRUE(api_schema);
+      api_schemas_[api.name] = std::move(api_schema);
+    }
+  }
+}
+
+// Tests API object initialization, calling a method on the supplied APIs, and
+// triggering the callback for the request.
+TEST_F(APIBindingsSystemTest, TestInitializationAndCallbacks) {
+  v8::Isolate* isolate = instance_->isolate();
+  v8::HandleScope handle_scope(isolate);
+  v8::Local<v8::Context> context =
+      v8::Local<v8::Context>::New(isolate, context_);
+
+  v8::Local<v8::Object> alpha_api =
+      bindings_system()->CreateAPIInstance(kAlphaAPIName, context, isolate);
+  ASSERT_FALSE(alpha_api.IsEmpty());
+  v8::Local<v8::Object> beta_api =
+      bindings_system()->CreateAPIInstance(kBetaAPIName, context, isolate);
+  ASSERT_FALSE(beta_api.IsEmpty());
+
+  {
+    // Test a simple call -> response.
+    const char kTestCall[] =
+        "obj.functionWithCallback('foo', function() {\n"
+        "  this.callbackArguments = Array.from(arguments);\n"
+        "});";
+    CallFunctionOnObject(context, alpha_api, kTestCall);
+
+    ValidateLastRequest("alpha.functionWithCallback", "['foo']");
+
+    const char kResponseArgsJson[] = "['response',1,{'key':42}]";
+    std::unique_ptr<base::ListValue> expected_args =
+        ListValueFromString(kResponseArgsJson);
+    bindings_system()->request_handler()->CompleteRequest(
+        last_request()->request_id, *expected_args);
+
+    v8::Local<v8::Value> res;
+    ASSERT_TRUE(
+        context->Global()
+            ->Get(context, gin::StringToV8(isolate, "callbackArguments"))
+            .ToLocal(&res));
+
+    std::unique_ptr<base::Value> out_val = V8ToBaseValue(res, context);
+    ASSERT_TRUE(out_val);
+    EXPECT_EQ(ReplaceSingleQuotes(kResponseArgsJson), ValueToString(*out_val));
+    reset_last_request();
+  }
+
+  {
+    // Test a call with references -> response.
+    const char kTestCall[] =
+        "obj.functionWithRefAndCallback({prop1: 'alpha', prop2: 42},\n"
+        "                               function() {\n"
+        "  this.callbackArguments = Array.from(arguments);\n"
+        "});";
+
+    CallFunctionOnObject(context, alpha_api, kTestCall);
+
+    ValidateLastRequest("alpha.functionWithRefAndCallback",
+                        "[{'prop1':'alpha','prop2':42}]");
+
+    bindings_system()->request_handler()->CompleteRequest(
+        last_request()->request_id, base::ListValue());
+
+    v8::Local<v8::Value> res;
+    ASSERT_TRUE(
+        context->Global()
+            ->Get(context, gin::StringToV8(isolate, "callbackArguments"))
+            .ToLocal(&res));
+
+    std::unique_ptr<base::Value> out_val = V8ToBaseValue(res, context);
+    ASSERT_TRUE(out_val);
+    EXPECT_EQ("[]", ValueToString(*out_val));
+    reset_last_request();
+  }
+
+  {
+    // Test a call -> response on the second API.
+    const char kTestCall[] = "obj.simpleFunc(2)";
+    CallFunctionOnObject(context, beta_api, kTestCall);
+    ValidateLastRequest("beta.simpleFunc", "[2]");
+    EXPECT_TRUE(last_request()->request_id.empty());
+    reset_last_request();
+  }
+}
+
+// An implementation using real API schemas.
+class APIBindingsSystemTestWithRealAPI : public APIBindingsSystemTestBase {
+ protected:
+  APIBindingsSystemTestWithRealAPI() {}
+
+  // Executes the given |script_source| in |context|, expecting no exceptions.
+  void ExecuteScript(v8::Local<v8::Context> context,
+                     const std::string& script_source);
+
+  // Executes the given |script_source| in |context| and compares a caught
+  // error to |expected_error|.
+  void ExecuteScriptAndExpectError(v8::Local<v8::Context> context,
+                                   const std::string& script_source,
+                                   const std::string& expected_error);
+
+ private:
+  const base::DictionaryValue& GetAPISchema(
+      const std::string& api_name) override {
+    const base::DictionaryValue* schema =
+        ExtensionAPI::GetSharedInstance()->GetSchema(api_name);
+    EXPECT_TRUE(schema);
+    return *schema;
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(APIBindingsSystemTestWithRealAPI);
+};
+
+void APIBindingsSystemTestWithRealAPI::ExecuteScript(
+    v8::Local<v8::Context> context,
+    const std::string& script_source) {
+  v8::Isolate* isolate = instance_->isolate();
+
+  v8::TryCatch try_catch(isolate);
+  // V8ValueFromScriptSource runs the source and returns the result; here, we
+  // only care about running the source.
+  V8ValueFromScriptSource(context, script_source);
+  EXPECT_FALSE(try_catch.HasCaught())
+      << gin::V8ToString(try_catch.Message()->Get());
+}
+
+void APIBindingsSystemTestWithRealAPI::ExecuteScriptAndExpectError(
+    v8::Local<v8::Context> context,
+    const std::string& script_source,
+    const std::string& expected_error) {
+  v8::Isolate* isolate = instance_->isolate();
+
+  v8::TryCatch try_catch(isolate);
+  V8ValueFromScriptSource(context, script_source);
+  ASSERT_TRUE(try_catch.HasCaught()) << script_source;
+  EXPECT_EQ(expected_error, gin::V8ToString(try_catch.Message()->Get()));
+}
+
+// The following test demonstrates how APIBindingsSystem can be used with "real"
+// Extension APIs; that is, using the raw Extension API schemas, rather than a
+// substituted test schema. This is useful to both show how the system is
+// intended to be used in the future as well as to make sure that it works with
+// actual APIs.
+TEST_F(APIBindingsSystemTestWithRealAPI, RealAPIs) {
+  v8::Isolate* isolate = instance_->isolate();
+  v8::HandleScope handle_scope(isolate);
+  v8::Local<v8::Context> context =
+      v8::Local<v8::Context>::New(isolate, context_);
+
+  v8::Local<v8::Object> chrome = v8::Object::New(isolate);
+  {
+    v8::Maybe<bool> res = context->Global()->Set(
+        context, gin::StringToV8(isolate, "chrome"), chrome);
+    ASSERT_TRUE(res.IsJust());
+    ASSERT_TRUE(res.FromJust());
+  }
+
+  auto add_api_to_chrome = [this, &chrome,
+                            &context](const std::string& api_name) {
+    v8::Local<v8::Object> api = bindings_system()->CreateAPIInstance(
+        api_name, context, context->GetIsolate());
+    ASSERT_FALSE(api.IsEmpty()) << api_name;
+    v8::Maybe<bool> res = chrome->Set(
+        context, gin::StringToV8(context->GetIsolate(), api_name), api);
+    ASSERT_TRUE(res.IsJust());
+    ASSERT_TRUE(res.FromJust());
+  };
+
+  // Pick two relatively small APIs that don't have any custom bindings (which
+  // aren't supported yet).
+  add_api_to_chrome("idle");
+  add_api_to_chrome("power");
+
+  // Test passing methods.
+  {
+    const char kTestCall[] = "chrome.power.requestKeepAwake('display');";
+    ExecuteScript(context, kTestCall);
+    ValidateLastRequest("power.requestKeepAwake", "['display']");
+    EXPECT_TRUE(last_request()->request_id.empty());
+    reset_last_request();
+  }
+
+  {
+    const char kTestCall[] = "chrome.power.releaseKeepAwake()";
+    ExecuteScript(context, kTestCall);
+    ValidateLastRequest("power.releaseKeepAwake", "[]");
+    EXPECT_TRUE(last_request()->request_id.empty());
+    reset_last_request();
+  }
+
+  {
+    const char kTestCall[] = "chrome.idle.queryState(30, function() {})";
+    ExecuteScript(context, kTestCall);
+    ValidateLastRequest("idle.queryState", "[30]");
+    EXPECT_FALSE(last_request()->request_id.empty());
+    reset_last_request();
+  }
+
+  {
+    const char kTestCall[] = "chrome.idle.setDetectionInterval(30);";
+    ExecuteScript(context, kTestCall);
+    ValidateLastRequest("idle.setDetectionInterval", "[30]");
+    EXPECT_TRUE(last_request()->request_id.empty());
+    reset_last_request();
+  }
+
+  // Check catching errors.
+  const char kError[] = "Uncaught TypeError: Invalid invocation";
+  {
+    // "disp" is not an allowed enum value.
+    const char kTestCall[] = "chrome.power.requestKeepAwake('disp');";
+    ExecuteScriptAndExpectError(context, kTestCall, kError);
+    EXPECT_FALSE(last_request());
+    reset_last_request();  // Just to not pollute future results.
+  }
+
+  {
+    // The queryState() param has a minimum of 15.
+    const char kTestCall[] = "chrome.idle.queryState(10, function() {});";
+    ExecuteScriptAndExpectError(context, kTestCall, kError);
+    EXPECT_FALSE(last_request());
+    reset_last_request();  // Just to not pollute future results.
+  }
+}
+
+}  // namespace extensions