content/child/v8_value_converter_impl_unittest.cc

   1 // Copyright (c) 2012 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 <cmath>
   6
   7 #include "base/memory/scoped_ptr.h"
   8 #include "base/stl_util.h"
   9 #include "base/test/values_test_util.h"
  10 #include "base/values.h"
  11 #include "content/child/v8_value_converter_impl.h"
  12 #include "testing/gtest/include/gtest/gtest.h"
  13 #include "v8/include/v8.h"
  14
  15 namespace content {
  16
  17 // To improve the performance of
  18 // V8ValueConverterImpl::UpdateAndCheckUniqueness, identity hashes of objects
  19 // are used during checking for duplicates. For testing purposes we need to
  20 // ignore the hash sometimes. Create this helper object to avoid using identity
  21 // hashes for the lifetime of the helper.
  22 class ScopedAvoidIdentityHashForTesting {
  23  public:
  24   // The hashes will be ignored in |converter|, which must not be NULL and it
  25   // must outlive the created instance of this helper.
  26   explicit ScopedAvoidIdentityHashForTesting(
  27       content::V8ValueConverterImpl* converter);
  28   ~ScopedAvoidIdentityHashForTesting();
  29
  30  private:
  31   content::V8ValueConverterImpl* converter_;
  32
  33   DISALLOW_COPY_AND_ASSIGN(ScopedAvoidIdentityHashForTesting);
  34 };
  35
  36 ScopedAvoidIdentityHashForTesting::ScopedAvoidIdentityHashForTesting(
  37     content::V8ValueConverterImpl* converter)
  38     : converter_(converter) {
  39   CHECK(converter_);
  40   converter_->avoid_identity_hash_for_testing_ = true;
  41 }
  42
  43 ScopedAvoidIdentityHashForTesting::~ScopedAvoidIdentityHashForTesting() {
  44   converter_->avoid_identity_hash_for_testing_ = false;
  45 }
  46
  47 class V8ValueConverterImplTest : public testing::Test {
  48  public:
  49   V8ValueConverterImplTest()
  50       : isolate_(v8::Isolate::GetCurrent()) {
  51   }
  52
  53  protected:
  54   void SetUp() override {
  55     v8::HandleScope handle_scope(isolate_);
  56     v8::Handle<v8::ObjectTemplate> global = v8::ObjectTemplate::New(isolate_);
  57     context_.Reset(isolate_, v8::Context::New(isolate_, NULL, global));
  58   }
  59
  60   void TearDown() override { context_.Reset(); }
  61
  62   std::string GetString(base::DictionaryValue* value, const std::string& key) {
  63     std::string temp;
  64     if (!value->GetString(key, &temp)) {
  65       ADD_FAILURE();
  66       return std::string();
  67     }
  68     return temp;
  69   }
  70
  71   std::string GetString(v8::Handle<v8::Object> value, const std::string& key) {
  72     v8::Handle<v8::String> temp =
  73         value->Get(v8::String::NewFromUtf8(isolate_, key.c_str()))
  74             .As<v8::String>();
  75     if (temp.IsEmpty()) {
  76       ADD_FAILURE();
  77       return std::string();
  78     }
  79     v8::String::Utf8Value utf8(temp);
  80     return std::string(*utf8, utf8.length());
  81   }
  82
  83   std::string GetString(base::ListValue* value, uint32 index) {
  84     std::string temp;
  85     if (!value->GetString(static_cast<size_t>(index), &temp)) {
  86       ADD_FAILURE();
  87       return std::string();
  88     }
  89     return temp;
  90   }
  91
  92   std::string GetString(v8::Handle<v8::Array> value, uint32 index) {
  93     v8::Handle<v8::String> temp = value->Get(index).As<v8::String>();
  94     if (temp.IsEmpty()) {
  95       ADD_FAILURE();
  96       return std::string();
  97     }
  98     v8::String::Utf8Value utf8(temp);
  99     return std::string(*utf8, utf8.length());
 100   }
 101
 102   bool IsNull(base::DictionaryValue* value, const std::string& key) {
 103     base::Value* child = NULL;
 104     if (!value->Get(key, &child)) {
 105       ADD_FAILURE();
 106       return false;
 107     }
 108     return child->GetType() == base::Value::TYPE_NULL;
 109   }
 110
 111   bool IsNull(v8::Handle<v8::Object> value, const std::string& key) {
 112     v8::Handle<v8::Value> child =
 113         value->Get(v8::String::NewFromUtf8(isolate_, key.c_str()));
 114     if (child.IsEmpty()) {
 115       ADD_FAILURE();
 116       return false;
 117     }
 118     return child->IsNull();
 119   }
 120
 121   bool IsNull(base::ListValue* value, uint32 index) {
 122     base::Value* child = NULL;
 123     if (!value->Get(static_cast<size_t>(index), &child)) {
 124       ADD_FAILURE();
 125       return false;
 126     }
 127     return child->GetType() == base::Value::TYPE_NULL;
 128   }
 129
 130   bool IsNull(v8::Handle<v8::Array> value, uint32 index) {
 131     v8::Handle<v8::Value> child = value->Get(index);
 132     if (child.IsEmpty()) {
 133       ADD_FAILURE();
 134       return false;
 135     }
 136     return child->IsNull();
 137   }
 138
 139   void TestWeirdType(const V8ValueConverterImpl& converter,
 140                      v8::Handle<v8::Value> val,
 141                      base::Value::Type expected_type,
 142                      scoped_ptr<base::Value> expected_value) {
 143     v8::Local<v8::Context> context =
 144         v8::Local<v8::Context>::New(isolate_, context_);
 145     scoped_ptr<base::Value> raw(converter.FromV8Value(val, context));
 146
 147     if (expected_value) {
 148       ASSERT_TRUE(raw.get());
 149       EXPECT_TRUE(expected_value->Equals(raw.get()));
 150       EXPECT_EQ(expected_type, raw->GetType());
 151     } else {
 152       EXPECT_FALSE(raw.get());
 153     }
 154
 155     v8::Handle<v8::Object> object(v8::Object::New(isolate_));
 156     object->Set(v8::String::NewFromUtf8(isolate_, "test"), val);
 157     scoped_ptr<base::DictionaryValue> dictionary(
 158         static_cast<base::DictionaryValue*>(
 159             converter.FromV8Value(object, context)));
 160     ASSERT_TRUE(dictionary.get());
 161
 162     if (expected_value) {
 163       base::Value* temp = NULL;
 164       ASSERT_TRUE(dictionary->Get("test", &temp));
 165       EXPECT_EQ(expected_type, temp->GetType());
 166       EXPECT_TRUE(expected_value->Equals(temp));
 167     } else {
 168       EXPECT_FALSE(dictionary->HasKey("test"));
 169     }
 170
 171     v8::Handle<v8::Array> array(v8::Array::New(isolate_));
 172     array->Set(0, val);
 173     scoped_ptr<base::ListValue> list(
 174         static_cast<base::ListValue*>(converter.FromV8Value(array, context)));
 175     ASSERT_TRUE(list.get());
 176     if (expected_value) {
 177       base::Value* temp = NULL;
 178       ASSERT_TRUE(list->Get(0, &temp));
 179       EXPECT_EQ(expected_type, temp->GetType());
 180       EXPECT_TRUE(expected_value->Equals(temp));
 181     } else {
 182       // Arrays should preserve their length, and convert unconvertible
 183       // types into null.
 184       base::Value* temp = NULL;
 185       ASSERT_TRUE(list->Get(0, &temp));
 186       EXPECT_EQ(base::Value::TYPE_NULL, temp->GetType());
 187     }
 188   }
 189
 190   v8::Isolate* isolate_;
 191
 192   // Context for the JavaScript in the test.
 193   v8::Persistent<v8::Context> context_;
 194 };
 195
 196 TEST_F(V8ValueConverterImplTest, BasicRoundTrip) {
 197   scoped_ptr<base::Value> original_root = base::test::ParseJson(
 198       "{ \n"
 199       "  \"null\": null, \n"
 200       "  \"true\": true, \n"
 201       "  \"false\": false, \n"
 202       "  \"positive-int\": 42, \n"
 203       "  \"negative-int\": -42, \n"
 204       "  \"zero\": 0, \n"
 205       "  \"double\": 88.8, \n"
 206       "  \"big-integral-double\": 9007199254740992.0, \n"  // 2.0^53
 207       "  \"string\": \"foobar\", \n"
 208       "  \"empty-string\": \"\", \n"
 209       "  \"dictionary\": { \n"
 210       "    \"foo\": \"bar\",\n"
 211       "    \"hot\": \"dog\",\n"
 212       "  }, \n"
 213       "  \"empty-dictionary\": {}, \n"
 214       "  \"list\": [ \"monkey\", \"balls\" ], \n"
 215       "  \"empty-list\": [], \n"
 216       "}");
 217
 218   v8::HandleScope handle_scope(isolate_);
 219   v8::Local<v8::Context> context =
 220       v8::Local<v8::Context>::New(isolate_, context_);
 221   v8::Context::Scope context_scope(context);
 222
 223   V8ValueConverterImpl converter;
 224   v8::Handle<v8::Object> v8_object =
 225       converter.ToV8Value(original_root.get(), context).As<v8::Object>();
 226   ASSERT_FALSE(v8_object.IsEmpty());
 227
 228   EXPECT_EQ(static_cast<const base::DictionaryValue&>(*original_root).size(),
 229             v8_object->GetPropertyNames()->Length());
 230   EXPECT_TRUE(
 231       v8_object->Get(v8::String::NewFromUtf8(isolate_, "null"))->IsNull());
 232   EXPECT_TRUE(
 233       v8_object->Get(v8::String::NewFromUtf8(isolate_, "true"))->IsTrue());
 234   EXPECT_TRUE(
 235       v8_object->Get(v8::String::NewFromUtf8(isolate_, "false"))->IsFalse());
 236   EXPECT_TRUE(v8_object->Get(v8::String::NewFromUtf8(isolate_, "positive-int"))
 237                   ->IsInt32());
 238   EXPECT_TRUE(v8_object->Get(v8::String::NewFromUtf8(isolate_, "negative-int"))
 239                   ->IsInt32());
 240   EXPECT_TRUE(
 241       v8_object->Get(v8::String::NewFromUtf8(isolate_, "zero"))->IsInt32());
 242   EXPECT_TRUE(
 243       v8_object->Get(v8::String::NewFromUtf8(isolate_, "double"))->IsNumber());
 244   EXPECT_TRUE(v8_object->Get(v8::String::NewFromUtf8(
 245                                  isolate_, "big-integral-double"))->IsNumber());
 246   EXPECT_TRUE(
 247       v8_object->Get(v8::String::NewFromUtf8(isolate_, "string"))->IsString());
 248   EXPECT_TRUE(v8_object->Get(v8::String::NewFromUtf8(isolate_, "empty-string"))
 249                   ->IsString());
 250   EXPECT_TRUE(v8_object->Get(v8::String::NewFromUtf8(isolate_, "dictionary"))
 251                   ->IsObject());
 252   EXPECT_TRUE(v8_object->Get(v8::String::NewFromUtf8(
 253                                  isolate_, "empty-dictionary"))->IsObject());
 254   EXPECT_TRUE(
 255       v8_object->Get(v8::String::NewFromUtf8(isolate_, "list"))->IsArray());
 256   EXPECT_TRUE(v8_object->Get(v8::String::NewFromUtf8(isolate_, "empty-list"))
 257                   ->IsArray());
 258
 259   scoped_ptr<base::Value> new_root(converter.FromV8Value(v8_object, context));
 260   EXPECT_NE(original_root.get(), new_root.get());
 261   EXPECT_TRUE(original_root->Equals(new_root.get()));
 262 }
 263
 264 TEST_F(V8ValueConverterImplTest, KeysWithDots) {
 265   scoped_ptr<base::Value> original =
 266       base::test::ParseJson("{ \"foo.bar\": \"baz\" }");
 267
 268   v8::HandleScope handle_scope(isolate_);
 269   v8::Local<v8::Context> context =
 270       v8::Local<v8::Context>::New(isolate_, context_);
 271   v8::Context::Scope context_scope(context);
 272
 273   V8ValueConverterImpl converter;
 274   scoped_ptr<base::Value> copy(
 275       converter.FromV8Value(
 276           converter.ToV8Value(original.get(), context), context));
 277
 278   EXPECT_TRUE(original->Equals(copy.get()));
 279 }
 280
 281 TEST_F(V8ValueConverterImplTest, ObjectExceptions) {
 282   v8::HandleScope handle_scope(isolate_);
 283   v8::Local<v8::Context> context =
 284       v8::Local<v8::Context>::New(isolate_, context_);
 285   v8::Context::Scope context_scope(context);
 286
 287   // Set up objects to throw when reading or writing 'foo'.
 288   const char* source =
 289       "Object.prototype.__defineSetter__('foo', "
 290       "    function() { throw new Error('muah!'); });"
 291       "Object.prototype.__defineGetter__('foo', "
 292       "    function() { throw new Error('muah!'); });";
 293
 294   v8::Handle<v8::Script> script(
 295       v8::Script::Compile(v8::String::NewFromUtf8(isolate_, source)));
 296   script->Run();
 297
 298   v8::Handle<v8::Object> object(v8::Object::New(isolate_));
 299   object->Set(v8::String::NewFromUtf8(isolate_, "bar"),
 300               v8::String::NewFromUtf8(isolate_, "bar"));
 301
 302   // Converting from v8 value should replace the foo property with null.
 303   V8ValueConverterImpl converter;
 304   scoped_ptr<base::DictionaryValue> converted(
 305       static_cast<base::DictionaryValue*>(
 306           converter.FromV8Value(object, context)));
 307   EXPECT_TRUE(converted.get());
 308   // http://code.google.com/p/v8/issues/detail?id=1342
 309   // EXPECT_EQ(2u, converted->size());
 310   // EXPECT_TRUE(IsNull(converted.get(), "foo"));
 311   EXPECT_EQ(1u, converted->size());
 312   EXPECT_EQ("bar", GetString(converted.get(), "bar"));
 313
 314   // Converting to v8 value should drop the foo property.
 315   converted->SetString("foo", "foo");
 316   v8::Handle<v8::Object> copy =
 317       converter.ToV8Value(converted.get(), context).As<v8::Object>();
 318   EXPECT_FALSE(copy.IsEmpty());
 319   EXPECT_EQ(2u, copy->GetPropertyNames()->Length());
 320   EXPECT_EQ("bar", GetString(copy, "bar"));
 321 }
 322
 323 TEST_F(V8ValueConverterImplTest, ArrayExceptions) {
 324   v8::HandleScope handle_scope(isolate_);
 325   v8::Local<v8::Context> context =
 326       v8::Local<v8::Context>::New(isolate_, context_);
 327   v8::Context::Scope context_scope(context);
 328
 329   const char* source = "(function() {"
 330       "var arr = [];"
 331       "arr.__defineSetter__(0, "
 332       "    function() { throw new Error('muah!'); });"
 333       "arr.__defineGetter__(0, "
 334       "    function() { throw new Error('muah!'); });"
 335       "arr[1] = 'bar';"
 336       "return arr;"
 337       "})();";
 338
 339   v8::Handle<v8::Script> script(
 340       v8::Script::Compile(v8::String::NewFromUtf8(isolate_, source)));
 341   v8::Handle<v8::Array> array = script->Run().As<v8::Array>();
 342   ASSERT_FALSE(array.IsEmpty());
 343
 344   // Converting from v8 value should replace the first item with null.
 345   V8ValueConverterImpl converter;
 346   scoped_ptr<base::ListValue> converted(static_cast<base::ListValue*>(
 347       converter.FromV8Value(array, context)));
 348   ASSERT_TRUE(converted.get());
 349   // http://code.google.com/p/v8/issues/detail?id=1342
 350   EXPECT_EQ(2u, converted->GetSize());
 351   EXPECT_TRUE(IsNull(converted.get(), 0));
 352
 353   // Converting to v8 value should drop the first item and leave a hole.
 354   converted.reset(static_cast<base::ListValue*>(
 355       base::test::ParseJson("[ \"foo\", \"bar\" ]").release()));
 356   v8::Handle<v8::Array> copy =
 357       converter.ToV8Value(converted.get(), context).As<v8::Array>();
 358   ASSERT_FALSE(copy.IsEmpty());
 359   EXPECT_EQ(2u, copy->Length());
 360   EXPECT_EQ("bar", GetString(copy, 1));
 361 }
 362
 363 TEST_F(V8ValueConverterImplTest, WeirdTypes) {
 364   v8::HandleScope handle_scope(isolate_);
 365   v8::Local<v8::Context> context =
 366       v8::Local<v8::Context>::New(isolate_, context_);
 367   v8::Context::Scope context_scope(context);
 368
 369   v8::Handle<v8::RegExp> regex(v8::RegExp::New(
 370       v8::String::NewFromUtf8(isolate_, "."), v8::RegExp::kNone));
 371
 372   V8ValueConverterImpl converter;
 373   TestWeirdType(converter,
 374                 v8::Undefined(isolate_),
 375                 base::Value::TYPE_NULL,  // Arbitrary type, result is NULL.
 376                 scoped_ptr<base::Value>());
 377   TestWeirdType(converter,
 378                 v8::Date::New(isolate_, 1000),
 379                 base::Value::TYPE_DICTIONARY,
 380                 scoped_ptr<base::Value>(new base::DictionaryValue()));
 381   TestWeirdType(converter,
 382                 regex,
 383                 base::Value::TYPE_DICTIONARY,
 384                 scoped_ptr<base::Value>(new base::DictionaryValue()));
 385
 386   converter.SetDateAllowed(true);
 387   TestWeirdType(converter,
 388                 v8::Date::New(isolate_, 1000),
 389                 base::Value::TYPE_DOUBLE,
 390                 scoped_ptr<base::Value>(new base::FundamentalValue(1.0)));
 391
 392   converter.SetRegExpAllowed(true);
 393   TestWeirdType(converter,
 394                 regex,
 395                 base::Value::TYPE_STRING,
 396                 scoped_ptr<base::Value>(new base::StringValue("/./")));
 397 }
 398
 399 TEST_F(V8ValueConverterImplTest, Prototype) {
 400   v8::HandleScope handle_scope(isolate_);
 401   v8::Local<v8::Context> context =
 402       v8::Local<v8::Context>::New(isolate_, context_);
 403   v8::Context::Scope context_scope(context);
 404
 405   const char* source = "(function() {"
 406       "Object.prototype.foo = 'foo';"
 407       "return {};"
 408       "})();";
 409
 410   v8::Handle<v8::Script> script(
 411       v8::Script::Compile(v8::String::NewFromUtf8(isolate_, source)));
 412   v8::Handle<v8::Object> object = script->Run().As<v8::Object>();
 413   ASSERT_FALSE(object.IsEmpty());
 414
 415   V8ValueConverterImpl converter;
 416   scoped_ptr<base::DictionaryValue> result(
 417       static_cast<base::DictionaryValue*>(
 418           converter.FromV8Value(object, context)));
 419   ASSERT_TRUE(result.get());
 420   EXPECT_EQ(0u, result->size());
 421 }
 422
 423 TEST_F(V8ValueConverterImplTest, StripNullFromObjects) {
 424   v8::HandleScope handle_scope(isolate_);
 425   v8::Local<v8::Context> context =
 426       v8::Local<v8::Context>::New(isolate_, context_);
 427   v8::Context::Scope context_scope(context);
 428
 429   const char* source = "(function() {"
 430       "return { foo: undefined, bar: null };"
 431       "})();";
 432
 433   v8::Handle<v8::Script> script(
 434       v8::Script::Compile(v8::String::NewFromUtf8(isolate_, source)));
 435   v8::Handle<v8::Object> object = script->Run().As<v8::Object>();
 436   ASSERT_FALSE(object.IsEmpty());
 437
 438   V8ValueConverterImpl converter;
 439   converter.SetStripNullFromObjects(true);
 440
 441   scoped_ptr<base::DictionaryValue> result(
 442       static_cast<base::DictionaryValue*>(
 443           converter.FromV8Value(object, context)));
 444   ASSERT_TRUE(result.get());
 445   EXPECT_EQ(0u, result->size());
 446 }
 447
 448 TEST_F(V8ValueConverterImplTest, RecursiveObjects) {
 449   v8::HandleScope handle_scope(isolate_);
 450   v8::Local<v8::Context> context =
 451       v8::Local<v8::Context>::New(isolate_, context_);
 452   v8::Context::Scope context_scope(context);
 453
 454   V8ValueConverterImpl converter;
 455
 456   v8::Handle<v8::Object> object = v8::Object::New(isolate_).As<v8::Object>();
 457   ASSERT_FALSE(object.IsEmpty());
 458   object->Set(v8::String::NewFromUtf8(isolate_, "foo"),
 459               v8::String::NewFromUtf8(isolate_, "bar"));
 460   object->Set(v8::String::NewFromUtf8(isolate_, "obj"), object);
 461
 462   scoped_ptr<base::DictionaryValue> object_result(
 463       static_cast<base::DictionaryValue*>(
 464           converter.FromV8Value(object, context)));
 465   ASSERT_TRUE(object_result.get());
 466   EXPECT_EQ(2u, object_result->size());
 467   EXPECT_TRUE(IsNull(object_result.get(), "obj"));
 468
 469   v8::Handle<v8::Array> array = v8::Array::New(isolate_).As<v8::Array>();
 470   ASSERT_FALSE(array.IsEmpty());
 471   array->Set(0, v8::String::NewFromUtf8(isolate_, "1"));
 472   array->Set(1, array);
 473
 474   scoped_ptr<base::ListValue> list_result(
 475       static_cast<base::ListValue*>(converter.FromV8Value(array, context)));
 476   ASSERT_TRUE(list_result.get());
 477   EXPECT_EQ(2u, list_result->GetSize());
 478   EXPECT_TRUE(IsNull(list_result.get(), 1));
 479 }
 480
 481 TEST_F(V8ValueConverterImplTest, WeirdProperties) {
 482   v8::HandleScope handle_scope(isolate_);
 483   v8::Local<v8::Context> context =
 484       v8::Local<v8::Context>::New(isolate_, context_);
 485   v8::Context::Scope context_scope(context);
 486
 487   const char* source = "(function() {"
 488       "return {"
 489         "1: 'foo',"
 490         "'2': 'bar',"
 491         "true: 'baz',"
 492         "false: 'qux',"
 493         "null: 'quux',"
 494         "undefined: 'oops'"
 495       "};"
 496       "})();";
 497
 498   v8::Handle<v8::Script> script(
 499       v8::Script::Compile(v8::String::NewFromUtf8(isolate_, source)));
 500   v8::Handle<v8::Object> object = script->Run().As<v8::Object>();
 501   ASSERT_FALSE(object.IsEmpty());
 502
 503   V8ValueConverterImpl converter;
 504   scoped_ptr<base::Value> actual(converter.FromV8Value(object, context));
 505
 506   scoped_ptr<base::Value> expected = base::test::ParseJson(
 507       "{ \n"
 508       "  \"1\": \"foo\", \n"
 509       "  \"2\": \"bar\", \n"
 510       "  \"true\": \"baz\", \n"
 511       "  \"false\": \"qux\", \n"
 512       "  \"null\": \"quux\", \n"
 513       "  \"undefined\": \"oops\", \n"
 514       "}");
 515
 516   EXPECT_TRUE(expected->Equals(actual.get()));
 517 }
 518
 519 TEST_F(V8ValueConverterImplTest, ArrayGetters) {
 520   v8::HandleScope handle_scope(isolate_);
 521   v8::Local<v8::Context> context =
 522       v8::Local<v8::Context>::New(isolate_, context_);
 523   v8::Context::Scope context_scope(context);
 524
 525   const char* source = "(function() {"
 526       "var a = [0];"
 527       "a.__defineGetter__(1, function() { return 'bar'; });"
 528       "return a;"
 529       "})();";
 530
 531   v8::Handle<v8::Script> script(
 532       v8::Script::Compile(v8::String::NewFromUtf8(isolate_, source)));
 533   v8::Handle<v8::Array> array = script->Run().As<v8::Array>();
 534   ASSERT_FALSE(array.IsEmpty());
 535
 536   V8ValueConverterImpl converter;
 537   scoped_ptr<base::ListValue> result(
 538       static_cast<base::ListValue*>(converter.FromV8Value(array, context)));
 539   ASSERT_TRUE(result.get());
 540   EXPECT_EQ(2u, result->GetSize());
 541 }
 542
 543 TEST_F(V8ValueConverterImplTest, UndefinedValueBehavior) {
 544   v8::HandleScope handle_scope(isolate_);
 545   v8::Local<v8::Context> context =
 546       v8::Local<v8::Context>::New(isolate_, context_);
 547   v8::Context::Scope context_scope(context);
 548
 549   v8::Handle<v8::Object> object;
 550   {
 551     const char* source = "(function() {"
 552         "return { foo: undefined, bar: null, baz: function(){} };"
 553         "})();";
 554     v8::Handle<v8::Script> script(
 555         v8::Script::Compile(v8::String::NewFromUtf8(isolate_, source)));
 556     object = script->Run().As<v8::Object>();
 557     ASSERT_FALSE(object.IsEmpty());
 558   }
 559
 560   v8::Handle<v8::Array> array;
 561   {
 562     const char* source = "(function() {"
 563         "return [ undefined, null, function(){} ];"
 564         "})();";
 565     v8::Handle<v8::Script> script(
 566         v8::Script::Compile(v8::String::NewFromUtf8(isolate_, source)));
 567     array = script->Run().As<v8::Array>();
 568     ASSERT_FALSE(array.IsEmpty());
 569   }
 570
 571   v8::Handle<v8::Array> sparse_array;
 572   {
 573     const char* source = "(function() {"
 574         "return new Array(3);"
 575         "})();";
 576     v8::Handle<v8::Script> script(
 577         v8::Script::Compile(v8::String::NewFromUtf8(isolate_, source)));
 578     sparse_array = script->Run().As<v8::Array>();
 579     ASSERT_FALSE(sparse_array.IsEmpty());
 580   }
 581
 582   V8ValueConverterImpl converter;
 583
 584   scoped_ptr<base::Value> actual_object(
 585       converter.FromV8Value(object, context));
 586   EXPECT_TRUE(base::Value::Equals(
 587       base::test::ParseJson("{ \"bar\": null }").get(), actual_object.get()));
 588
 589   // Everything is null because JSON stringification preserves array length.
 590   scoped_ptr<base::Value> actual_array(converter.FromV8Value(array, context));
 591   EXPECT_TRUE(base::Value::Equals(
 592       base::test::ParseJson("[ null, null, null ]").get(), actual_array.get()));
 593
 594   scoped_ptr<base::Value> actual_sparse_array(
 595       converter.FromV8Value(sparse_array, context));
 596   EXPECT_TRUE(
 597       base::Value::Equals(base::test::ParseJson("[ null, null, null ]").get(),
 598                           actual_sparse_array.get()));
 599 }
 600
 601 TEST_F(V8ValueConverterImplTest, ObjectsWithClashingIdentityHash) {
 602   v8::HandleScope handle_scope(isolate_);
 603   v8::Local<v8::Context> context =
 604       v8::Local<v8::Context>::New(isolate_, context_);
 605   v8::Context::Scope context_scope(context);
 606   V8ValueConverterImpl converter;
 607
 608   // We check that the converter checks identity correctly by disabling the
 609   // optimization of using identity hashes.
 610   ScopedAvoidIdentityHashForTesting scoped_hash_avoider(&converter);
 611
 612   // Create the v8::Object to be converted.
 613   v8::Handle<v8::Array> root(v8::Array::New(isolate_, 4));
 614   root->Set(0, v8::Handle<v8::Object>(v8::Object::New(isolate_)));
 615   root->Set(1, v8::Handle<v8::Object>(v8::Object::New(isolate_)));
 616   root->Set(2, v8::Handle<v8::Object>(v8::Array::New(isolate_, 0)));
 617   root->Set(3, v8::Handle<v8::Object>(v8::Array::New(isolate_, 0)));
 618
 619   // The expected base::Value result.
 620   scoped_ptr<base::Value> expected = base::test::ParseJson("[{},{},[],[]]");
 621   ASSERT_TRUE(expected.get());
 622
 623   // The actual result.
 624   scoped_ptr<base::Value> value(converter.FromV8Value(root, context));
 625   ASSERT_TRUE(value.get());
 626
 627   EXPECT_TRUE(expected->Equals(value.get()));
 628 }
 629
 630 TEST_F(V8ValueConverterImplTest, DetectCycles) {
 631   v8::HandleScope handle_scope(isolate_);
 632   v8::Local<v8::Context> context =
 633       v8::Local<v8::Context>::New(isolate_, context_);
 634   v8::Context::Scope context_scope(context);
 635   V8ValueConverterImpl converter;
 636
 637   // Create a recursive array.
 638   v8::Handle<v8::Array> recursive_array(v8::Array::New(isolate_, 1));
 639   recursive_array->Set(0, recursive_array);
 640
 641   // The first repetition should be trimmed and replaced by a null value.
 642   base::ListValue expected_list;
 643   expected_list.Append(base::Value::CreateNullValue());
 644
 645   // The actual result.
 646   scoped_ptr<base::Value> actual_list(
 647       converter.FromV8Value(recursive_array, context));
 648   ASSERT_TRUE(actual_list.get());
 649
 650   EXPECT_TRUE(expected_list.Equals(actual_list.get()));
 651
 652   // Now create a recursive object
 653   const std::string key("key");
 654   v8::Handle<v8::Object> recursive_object(v8::Object::New(isolate_));
 655   v8::TryCatch try_catch;
 656   recursive_object->Set(
 657       v8::String::NewFromUtf8(
 658           isolate_, key.c_str(), v8::String::kNormalString, key.length()),
 659       recursive_object);
 660   ASSERT_FALSE(try_catch.HasCaught());
 661
 662   // The first repetition should be trimmed and replaced by a null value.
 663   base::DictionaryValue expected_dictionary;
 664   expected_dictionary.Set(key, base::Value::CreateNullValue());
 665
 666   // The actual result.
 667   scoped_ptr<base::Value> actual_dictionary(
 668       converter.FromV8Value(recursive_object, context));
 669   ASSERT_TRUE(actual_dictionary.get());
 670
 671   EXPECT_TRUE(expected_dictionary.Equals(actual_dictionary.get()));
 672 }
 673
 674 TEST_F(V8ValueConverterImplTest, MaxRecursionDepth) {
 675   v8::HandleScope handle_scope(isolate_);
 676   v8::Local<v8::Context> context =
 677       v8::Local<v8::Context>::New(isolate_, context_);
 678   v8::Context::Scope context_scope(context);
 679
 680   // Must larger than kMaxRecursionDepth in v8_value_converter_impl.cc.
 681   int kDepth = 1000;
 682   const char kKey[] = "key";
 683
 684   v8::Local<v8::Object> deep_object = v8::Object::New(isolate_);
 685
 686   v8::Local<v8::Object> leaf = deep_object;
 687   for (int i = 0; i < kDepth; ++i) {
 688     v8::Local<v8::Object> new_object = v8::Object::New(isolate_);
 689     leaf->Set(v8::String::NewFromUtf8(isolate_, kKey), new_object);
 690     leaf = new_object;
 691   }
 692
 693   V8ValueConverterImpl converter;
 694   scoped_ptr<base::Value> value(converter.FromV8Value(deep_object, context));
 695   ASSERT_TRUE(value);
 696
 697   // Expected depth is kMaxRecursionDepth in v8_value_converter_impl.cc.
 698   int kExpectedDepth = 100;
 699
 700   base::Value* current = value.get();
 701   for (int i = 1; i < kExpectedDepth; ++i) {
 702     base::DictionaryValue* current_as_object = NULL;
 703     ASSERT_TRUE(current->GetAsDictionary(&current_as_object)) << i;
 704     ASSERT_TRUE(current_as_object->Get(kKey, &current)) << i;
 705   }
 706
 707   // The leaf node shouldn't have any properties.
 708   base::DictionaryValue empty;
 709   EXPECT_TRUE(base::Value::Equals(&empty, current)) << *current;
 710 }
 711
 712 class V8ValueConverterOverridingStrategyForTesting
 713     : public V8ValueConverter::Strategy {
 714  public:
 715   V8ValueConverterOverridingStrategyForTesting()
 716       : reference_value_(NewReferenceValue()) {}
 717   bool FromV8Object(v8::Handle<v8::Object> value,
 718                     base::Value** out,
 719                     v8::Isolate* isolate,
 720                     const FromV8ValueCallback& callback) const override {
 721     *out = NewReferenceValue();
 722     return true;
 723   }
 724   bool FromV8Array(v8::Handle<v8::Array> value,
 725                    base::Value** out,
 726                    v8::Isolate* isolate,
 727                    const FromV8ValueCallback& callback) const override {
 728     *out = NewReferenceValue();
 729     return true;
 730   }
 731   bool FromV8ArrayBuffer(v8::Handle<v8::Object> value,
 732                          base::Value** out,
 733                          v8::Isolate* isolate) const override {
 734     *out = NewReferenceValue();
 735     return true;
 736   }
 737   bool FromV8Number(v8::Handle<v8::Number> value,
 738                     base::Value** out) const override {
 739     *out = NewReferenceValue();
 740     return true;
 741   }
 742   bool FromV8Undefined(base::Value** out) const override {
 743     *out = NewReferenceValue();
 744     return true;
 745   }
 746   base::Value* reference_value() const { return reference_value_.get(); }
 747
 748  private:
 749   static base::Value* NewReferenceValue() {
 750     return new base::StringValue("strategy");
 751   }
 752   scoped_ptr<base::Value> reference_value_;
 753 };
 754
 755 TEST_F(V8ValueConverterImplTest, StrategyOverrides) {
 756   v8::HandleScope handle_scope(isolate_);
 757   v8::Local<v8::Context> context =
 758       v8::Local<v8::Context>::New(isolate_, context_);
 759   v8::Context::Scope context_scope(context);
 760
 761   V8ValueConverterImpl converter;
 762   V8ValueConverterOverridingStrategyForTesting strategy;
 763   converter.SetStrategy(&strategy);
 764
 765   v8::Handle<v8::Object> object(v8::Object::New(isolate_));
 766   scoped_ptr<base::Value> object_value(converter.FromV8Value(object, context));
 767   ASSERT_TRUE(object_value);
 768   EXPECT_TRUE(
 769       base::Value::Equals(strategy.reference_value(), object_value.get()));
 770
 771   v8::Handle<v8::Array> array(v8::Array::New(isolate_));
 772   scoped_ptr<base::Value> array_value(converter.FromV8Value(array, context));
 773   ASSERT_TRUE(array_value);
 774   EXPECT_TRUE(
 775       base::Value::Equals(strategy.reference_value(), array_value.get()));
 776
 777   v8::Handle<v8::ArrayBuffer> array_buffer(v8::ArrayBuffer::New(isolate_, 0));
 778   scoped_ptr<base::Value> array_buffer_value(
 779       converter.FromV8Value(array_buffer, context));
 780   ASSERT_TRUE(array_buffer_value);
 781   EXPECT_TRUE(base::Value::Equals(strategy.reference_value(),
 782                                   array_buffer_value.get()));
 783
 784   v8::Handle<v8::ArrayBufferView> array_buffer_view(
 785       v8::Uint8Array::New(array_buffer, 0, 0));
 786   scoped_ptr<base::Value> array_buffer_view_value(
 787       converter.FromV8Value(array_buffer_view, context));
 788   ASSERT_TRUE(array_buffer_view_value);
 789   EXPECT_TRUE(base::Value::Equals(strategy.reference_value(),
 790                                   array_buffer_view_value.get()));
 791
 792   v8::Handle<v8::Number> number(v8::Number::New(isolate_, 0.0));
 793   scoped_ptr<base::Value> number_value(converter.FromV8Value(number, context));
 794   ASSERT_TRUE(number_value);
 795   EXPECT_TRUE(
 796       base::Value::Equals(strategy.reference_value(), number_value.get()));
 797
 798   v8::Handle<v8::Primitive> undefined(v8::Undefined(isolate_));
 799   scoped_ptr<base::Value> undefined_value(
 800       converter.FromV8Value(undefined, context));
 801   ASSERT_TRUE(undefined_value);
 802   EXPECT_TRUE(
 803       base::Value::Equals(strategy.reference_value(), undefined_value.get()));
 804 }
 805
 806 class V8ValueConverterBypassStrategyForTesting
 807     : public V8ValueConverter::Strategy {
 808  public:
 809   bool FromV8Object(v8::Handle<v8::Object> value,
 810                     base::Value** out,
 811                     v8::Isolate* isolate,
 812                     const FromV8ValueCallback& callback) const override {
 813     return false;
 814   }
 815   bool FromV8Array(v8::Handle<v8::Array> value,
 816                    base::Value** out,
 817                    v8::Isolate* isolate,
 818                    const FromV8ValueCallback& callback) const override {
 819     return false;
 820   }
 821   bool FromV8ArrayBuffer(v8::Handle<v8::Object> value,
 822                          base::Value** out,
 823                          v8::Isolate* isolate) const override {
 824     return false;
 825   }
 826   bool FromV8Number(v8::Handle<v8::Number> value,
 827                     base::Value** out) const override {
 828     return false;
 829   }
 830   bool FromV8Undefined(base::Value** out) const override { return false; }
 831 };
 832
 833 // Verify that having a strategy that fallbacks to default behaviour
 834 // actually preserves it.
 835 TEST_F(V8ValueConverterImplTest, StrategyBypass) {
 836   v8::HandleScope handle_scope(isolate_);
 837   v8::Local<v8::Context> context =
 838       v8::Local<v8::Context>::New(isolate_, context_);
 839   v8::Context::Scope context_scope(context);
 840
 841   V8ValueConverterImpl converter;
 842   V8ValueConverterBypassStrategyForTesting strategy;
 843   converter.SetStrategy(&strategy);
 844
 845   v8::Handle<v8::Object> object(v8::Object::New(isolate_));
 846   scoped_ptr<base::Value> object_value(converter.FromV8Value(object, context));
 847   ASSERT_TRUE(object_value);
 848   scoped_ptr<base::Value> reference_object_value(base::test::ParseJson("{}"));
 849   EXPECT_TRUE(
 850       base::Value::Equals(reference_object_value.get(), object_value.get()));
 851
 852   v8::Handle<v8::Array> array(v8::Array::New(isolate_));
 853   scoped_ptr<base::Value> array_value(converter.FromV8Value(array, context));
 854   ASSERT_TRUE(array_value);
 855   scoped_ptr<base::Value> reference_array_value(base::test::ParseJson("[]"));
 856   EXPECT_TRUE(
 857       base::Value::Equals(reference_array_value.get(), array_value.get()));
 858
 859   // Not testing ArrayBuffers as V8ValueConverter uses blink helpers and
 860   // this requires having blink to be initialized.
 861
 862   v8::Handle<v8::Number> number(v8::Number::New(isolate_, 0.0));
 863   scoped_ptr<base::Value> number_value(converter.FromV8Value(number, context));
 864   ASSERT_TRUE(number_value);
 865   scoped_ptr<base::Value> reference_number_value(base::test::ParseJson("0"));
 866   EXPECT_TRUE(
 867       base::Value::Equals(reference_number_value.get(), number_value.get()));
 868
 869   v8::Handle<v8::Primitive> undefined(v8::Undefined(isolate_));
 870   scoped_ptr<base::Value> undefined_value(
 871       converter.FromV8Value(undefined, context));
 872   EXPECT_FALSE(undefined_value);
 873 }
 874
 875 }  // namespace content