From a81485ebcb8cffbf3505c8216883fa0ae28b2204 Mon Sep 17 00:00:00 2001
From: Joyee Cheung <joyeec9h3@gmail.com>
Date: Wed, 5 Jun 2019 17:06:32 +0200
Subject: [PATCH] src: expose DOMException to internalBinding('message') for
 testing

Instead of using a hack to get it in the test.
---
 src/node_messaging.cc | 34 +++++++++++++++++++++++-----------
 test/wpt/test-url.js  | 17 ++---------------
 2 files changed, 25 insertions(+), 26 deletions(-)

diff --git a/src/node_messaging.cc b/src/node_messaging.cc
index fa583a2570315b..0e782ef72675ef 100644
--- a/src/node_messaging.cc
+++ b/src/node_messaging.cc
@@ -186,27 +186,30 @@ uint32_t Message::AddWASMModule(WasmModuleObject::TransferrableModule&& mod) {
 
 namespace {
 
-void ThrowDataCloneException(Local<Context> context, Local<String> message) {
+MaybeLocal<Function> GetDOMException(Local<Context> context) {
   Isolate* isolate = context->GetIsolate();
-  Local<Value> argv[] = {
-    message,
-    FIXED_ONE_BYTE_STRING(isolate, "DataCloneError")
-  };
-  Local<Value> exception;
-
   Local<Object> per_context_bindings;
   Local<Value> domexception_ctor_val;
   if (!GetPerContextExports(context).ToLocal(&per_context_bindings) ||
       !per_context_bindings->Get(context,
                                 FIXED_ONE_BYTE_STRING(isolate, "DOMException"))
           .ToLocal(&domexception_ctor_val)) {
-    return;
+    return MaybeLocal<Function>();
   }
-
   CHECK(domexception_ctor_val->IsFunction());
   Local<Function> domexception_ctor = domexception_ctor_val.As<Function>();
-  if (!domexception_ctor->NewInstance(context, arraysize(argv), argv)
-          .ToLocal(&exception)) {
+  return domexception_ctor;
+}
+
+void ThrowDataCloneException(Local<Context> context, Local<String> message) {
+  Isolate* isolate = context->GetIsolate();
+  Local<Value> argv[] = {message,
+                         FIXED_ONE_BYTE_STRING(isolate, "DataCloneError")};
+  Local<Value> exception;
+  Local<Function> domexception_ctor;
+  if (!GetDOMException(context).ToLocal(&domexception_ctor) ||
+      !domexception_ctor->NewInstance(context, arraysize(argv), argv)
+           .ToLocal(&exception)) {
     return;
   }
   isolate->ThrowException(exception);
@@ -900,6 +903,15 @@ static void InitMessaging(Local<Object> target,
   env->SetMethod(target, "receiveMessageOnPort", MessagePort::ReceiveMessage);
   env->SetMethod(target, "moveMessagePortToContext",
                  MessagePort::MoveToContext);
+
+  {
+    Local<Function> domexception = GetDOMException(context).ToLocalChecked();
+    target
+        ->Set(context,
+              FIXED_ONE_BYTE_STRING(env->isolate(), "DOMException"),
+              domexception)
+        .Check();
+  }
 }
 
 }  // anonymous namespace
diff --git a/test/wpt/test-url.js b/test/wpt/test-url.js
index 4b909988ddb5ee..5d5240ce181393 100644
--- a/test/wpt/test-url.js
+++ b/test/wpt/test-url.js
@@ -3,29 +3,16 @@
 // Flags: --expose-internals
 
 require('../common');
-const assert = require('assert');
 const { WPTRunner } = require('../common/wpt');
-
+const { internalBinding } = require('internal/test/binding');
+const { DOMException } = internalBinding('messaging');
 const runner = new WPTRunner('url');
 
 // Copy global descriptors from the global object
 runner.copyGlobalsFromObject(global, ['URL', 'URLSearchParams']);
 // Needed by urlsearchparams-constructor.any.js
-let DOMException;
 runner.defineGlobal('DOMException', {
   get() {
-    // A 'hack' to get the DOMException constructor since we don't have it
-    // on the global object.
-    if (DOMException === undefined) {
-      const port = new (require('worker_threads').MessagePort)();
-      const ab = new ArrayBuffer(1);
-      try {
-        port.postMessage(ab, [ab, ab]);
-      } catch (err) {
-        DOMException = err.constructor;
-      }
-      assert.strictEqual(DOMException.name, 'DOMException');
-    }
     return DOMException;
   }
 });