nodejs · gabrielschulhof · Oct 17, 2019
diff --git a/doc/api/n-api.md b/doc/api/n-api.md
@@ -1372,6 +1372,66 @@ However, for better performance, it's better for the caller to make sure that
 the `napi_value` in question is of the JavaScript type expected by the API.
 
 ### Enum types
+#### napi_key_collection_mode
+<!-- YAML
+added: REPLACEME
+-->
+
+> Stability: 1 - Experimental
+
+```C
+typedef enum {
+  napi_key_include_prototypes,
+  napi_key_own_only
+} napi_key_collection_mode;
+```
+
+Describes the `Keys/Properties` filter enums:
+
+`napi_key_collection_mode` limits the range of collected properties.
+
+`napi_key_own_only` limits the collected properties to the given
+object only. `napi_key_include_prototypes` will include all keys
+of the objects's prototype chain as well.
+
+#### napi_key_filter
+<!-- YAML
+added: REPLACEME
+-->
+
+> Stability: 1 - Experimental
+
+```C
+typedef enum {
+  napi_key_all_properties = 0,
+  napi_key_writable = 1,
+  napi_key_enumerable = 1 << 1,
+  napi_key_configurable = 1 << 2,
+  napi_key_skip_strings = 1 << 3,
+  napi_key_skip_symbols = 1 << 4
+} napi_key_filter;
+```
+
+Property filter bits. They can be or'ed to build a composite filter.
+
+#### napi_key_conversion
+<!-- YAML
+added: REPLACEME
+-->
+
+> Stability: 1 - Experimental
+
+```C
+typedef enum {
+  napi_key_keep_numbers,
+  napi_key_numbers_to_strings
+} napi_key_conversion;
+```
+
+`napi_key_numbers_to_strings` will convert integer indices to
+strings. `napi_key_keep_numbers` will return numbers for integer
+indices.
+
 #### napi_valuetype
 ```C
 typedef enum {
@@ -3126,6 +3186,37 @@ This API returns the names of the enumerable properties of `object` as an array
 of strings. The properties of `object` whose key is a symbol will not be
 included.
 
+#### napi_get_all_property_names
+<!-- YAML
+added: REPLACEME
+-->
+
+> Stability: 1 - Experimental
+
+```C
+napi_get_all_property_names(napi_env env,
+                            napi_value object,
+                            napi_key_collection_mode key_mode,
+                            napi_key_filter key_filter,
+                            napi_key_conversion key_conversion,
+                            napi_value* result);
+```
+
+* `[in] env`: The environment that the N-API call is invoked under.
+* `[in] object`: The object from which to retrieve the properties.
+* `[in] key_mode`: Whether to retrieve prototype properties as well.
+* `[in] key_filter`: Which properties to retrieve
+(enumerable/readable/writable).
+* `[in] key_conversion`: Whether to convert numbered property keys to strings.
+* `[out] result`: A `napi_value` representing an array of JavaScript values
+that represent the property names of the object. [`napi_get_array_length`][] and
+[`napi_get_element`][] can be used to iterate over `result`.
+
+Returns `napi_ok` if the API succeeded.
+
+This API returns an array containing the names of the available properties
+of this object.
+
 #### napi_set_property
 <!-- YAML
 added: v8.0.0

diff --git a/src/node_api.cc b/src/node_api.cc
@@ -192,6 +192,17 @@ struct napi_env__ {
     (out) = v8::type::New((buffer), (byte_offset), (length));                  \
   } while (0)
 
+#define RETURN_STATUS_IF_FALSE_WITH_PREAMBLE(env, condition, status)           \
+  do {                                                                         \
+    if (!(condition)) {                                                        \
+      return napi_set_last_error(                                              \
+          (env), try_catch.HasCaught() ? napi_pending_exception : (status));   \
+    }                                                                          \
+  } while (0)
+
+#define CHECK_MAYBE_EMPTY_WITH_PREAMBLE(env, maybe, status)                    \
+  RETURN_STATUS_IF_FALSE_WITH_PREAMBLE((env), !((maybe).IsEmpty()), (status))
+
 namespace {
 namespace v8impl {
 
@@ -1604,19 +1615,92 @@ napi_status napi_define_class(napi_env env,
 napi_status napi_get_property_names(napi_env env,
                                     napi_value object,
                                     napi_value* result) {
+  return napi_get_all_property_names(
+      env,
+      object,
+      napi_key_include_prototypes,
+      static_cast<napi_key_filter>(napi_key_enumerable |
+                                   napi_key_skip_symbols),
+      napi_key_numbers_to_strings,
+      result);
+}
+
+napi_status napi_get_all_property_names(napi_env env,
+                                        napi_value object,
+                                        napi_key_collection_mode key_mode,
+                                        napi_key_filter key_filter,
+                                        napi_key_conversion key_conversion,
+                                        napi_value* result) {
   NAPI_PREAMBLE(env);
   CHECK_ARG(env, result);
 
   v8::Local<v8::Context> context = env->context();
   v8::Local<v8::Object> obj;
   CHECK_TO_OBJECT(env, context, obj, object);
 
-  auto maybe_propertynames = obj->GetPropertyNames(context);
+  v8::PropertyFilter filter = v8::PropertyFilter::ALL_PROPERTIES;
+  if (key_filter & napi_key_writable) {
+    filter =
+        static_cast<v8::PropertyFilter>(filter |
+                                        v8::PropertyFilter::ONLY_WRITABLE);
+  }
+  if (key_filter & napi_key_enumerable) {
+    filter =
+        static_cast<v8::PropertyFilter>(filter |
+                                        v8::PropertyFilter::ONLY_ENUMERABLE);
+  }
+  if (key_filter & napi_key_configurable) {
+    filter =
+        static_cast<v8::PropertyFilter>(filter |
+                                        v8::PropertyFilter::ONLY_WRITABLE);
+  }
+  if (key_filter & napi_key_skip_strings) {
+    filter =
+        static_cast<v8::PropertyFilter>(filter |
+                                        v8::PropertyFilter::SKIP_STRINGS);
+  }
+  if (key_filter & napi_key_skip_symbols) {
+    filter =
+        static_cast<v8::PropertyFilter>(filter |
+                                        v8::PropertyFilter::SKIP_SYMBOLS);
+  }
+  v8::KeyCollectionMode collection_mode;
+  v8::KeyConversionMode conversion_mode;
+
+  switch (key_mode) {
+    case napi_key_include_prototypes:
+      collection_mode = v8::KeyCollectionMode::kIncludePrototypes;
+      break;
+    case napi_key_own_only:
+      collection_mode = v8::KeyCollectionMode::kOwnOnly;
+      break;
+    default:
+      return napi_set_last_error(env, napi_invalid_arg);
+  }
 
-  CHECK_MAYBE_EMPTY(env, maybe_propertynames, napi_generic_failure);
+  switch (key_conversion) {
+    case napi_key_keep_numbers:
+      conversion_mode = v8::KeyConversionMode::kKeepNumbers;
+      break;
+    case napi_key_numbers_to_strings:
+      conversion_mode = v8::KeyConversionMode::kConvertToString;
+      break;
+    default:
+      return napi_set_last_error(env, napi_invalid_arg);
+  }
 
-  *result = v8impl::JsValueFromV8LocalValue(
-      maybe_propertynames.ToLocalChecked());
+  v8::MaybeLocal<v8::Array> maybe_all_propertynames =
+      obj->GetPropertyNames(context,
+                            collection_mode,
+                            filter,
+                            v8::IndexFilter::kIncludeIndices,
+                            conversion_mode);
+
+  CHECK_MAYBE_EMPTY_WITH_PREAMBLE(
+      env, maybe_all_propertynames, napi_generic_failure);
+
+  *result =
+      v8impl::JsValueFromV8LocalValue(maybe_all_propertynames.ToLocalChecked());
   return GET_RETURN_STATUS(env);
 }
 

diff --git a/src/node_api.h b/src/node_api.h
@@ -735,6 +735,16 @@ NAPI_EXTERN napi_status napi_set_instance_data(napi_env env,
 
 NAPI_EXTERN napi_status napi_get_instance_data(napi_env env,
                                                void** data);
+
+// Object
+NAPI_EXTERN napi_status
+napi_get_all_property_names(napi_env env,
+                            napi_value object,
+                            napi_key_collection_mode key_mode,
+                            napi_key_filter key_filter,
+                            napi_key_conversion key_conversion,
+                            napi_value* result);
+
 #endif  // NAPI_EXPERIMENTAL
 
 EXTERN_C_END

diff --git a/src/node_api_types.h b/src/node_api_types.h
@@ -147,4 +147,25 @@ typedef struct {
   const char* release;
 } napi_node_version;
 
+#ifdef NAPI_EXPERIMENTAL
+typedef enum {
+  napi_key_include_prototypes,
+  napi_key_own_only
+} napi_key_collection_mode;
+
+typedef enum {
+  napi_key_all_properties = 0,
+  napi_key_writable = 1,
+  napi_key_enumerable = 1 << 1,
+  napi_key_configurable = 1 << 2,
+  napi_key_skip_strings = 1 << 3,
+  napi_key_skip_symbols = 1 << 4
+} napi_key_filter;
+
+typedef enum {
+  napi_key_keep_numbers,
+  napi_key_numbers_to_strings
+} napi_key_conversion;
+#endif
+
 #endif  // SRC_NODE_API_TYPES_H_
diff --git a/test/addons-napi/test_object/test.js b/test/addons-napi/test_object/test.js
@@ -5,6 +5,7 @@ const assert = require('assert');
 // Testing api calls for objects
 const test_object = require(`./build/${common.buildType}/test_object`);
 
+const fooSymbol = Symbol('foo');
 
 const object = {
   hello: 'world',
@@ -16,6 +17,8 @@ const object = {
   }
 };
 
+object[fooSymbol] = 3;
+
 assert.strictEqual(test_object.Get(object, 'hello'), 'world');
 assert.deepStrictEqual(test_object.Get(object, 'array'),
                        [ 1, 94, 'str', 12.321, { test: 'obj in arr' } ]);
@@ -25,6 +28,7 @@ assert.deepStrictEqual(test_object.Get(object, 'newObject'),
 assert(test_object.Has(object, 'hello'));
 assert(test_object.Has(object, 'array'));
 assert(test_object.Has(object, 'newObject'));
+assert.deepStrictEqual(test_object.GetSymbolNames(object), [fooSymbol]);
 
 const newObject = test_object.New();
 assert(test_object.Has(newObject, 'test_number'));

diff --git a/test/addons-napi/test_object/test_object.c b/test/addons-napi/test_object/test_object.c
@@ -1,3 +1,4 @@
+#define NAPI_EXPERIMENTAL
 #include <node_api.h>
 #include "../common.h"
 #include <string.h>
@@ -193,6 +194,33 @@ static napi_value Inflate(napi_env env, napi_callback_info info) {
   return obj;
 }
 
+static napi_value GetSymbolNames(napi_env env, napi_callback_info info) {
+  size_t argc = 1;
+  napi_value args[1];
+  NAPI_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));
+
+  NAPI_ASSERT(env, argc >= 1, "Wrong number of arguments");
+
+  napi_valuetype value_type0;
+  NAPI_CALL(env, napi_typeof(env, args[0], &value_type0));
+
+  NAPI_ASSERT(env,
+              value_type0 == napi_object,
+              "Wrong type of arguments. Expects an object as first argument.");
+
+  napi_value output;
+  NAPI_CALL(env,
+            napi_get_all_property_names(
+                env,
+                args[0],
+                napi_key_include_prototypes,
+                napi_key_skip_strings,
+                napi_key_numbers_to_strings,
+                &output));
+
+  return output;
+}
+
 static napi_value Wrap(napi_env env, napi_callback_info info) {
   size_t argc = 1;
   napi_value arg;
@@ -220,6 +248,7 @@ static napi_value Init(napi_env env, napi_value exports) {
   napi_property_descriptor descriptors[] = {
     DECLARE_NAPI_PROPERTY("Get", Get),
     DECLARE_NAPI_PROPERTY("Set", Set),
+    DECLARE_NAPI_PROPERTY("GetSymbolNames", GetSymbolNames),
     DECLARE_NAPI_PROPERTY("Has", Has),
     DECLARE_NAPI_PROPERTY("HasOwn", HasOwn),
     DECLARE_NAPI_PROPERTY("Delete", Delete),