url: add ToObject method to native URL class

Provides a factory method to convert a native URL class
into a JS URL object.

```c++
Environment* env = ...

URL url("http://example.org/a/b/c?query#fragment");

MaybeLocal<Value> val = url.ToObject(env);
```

PR-URL: https://github.com/nodejs/node/pull/12056
Reviewed-By: Anna Henningsen <anna@addaleax.net>

2 files changed, 29 insertions, 0 deletions

diff --git a/lib/internal/bootstrap_node.js b/lib/internal/bootstrap_node.js
index d7aa89a5ee..479f06e5db 100644
--- a/lib/internal/bootstrap_node.js
+++ b/lib/internal/bootstrap_node.js
@@ -54,6 +54,10 @@
 
     _process.setupRawDebug();
 
+    // Ensure setURLConstructor() is called before the native
+    // URL::ToObject() method is used.
+    NativeModule.require('internal/url');
+
     Object.defineProperty(process, 'argv0', {
       enumerable: true,
       configurable: false,
diff --git a/lib/internal/url.js b/lib/internal/url.js
index 64156803d8..5fcabb803e 100644
--- a/lib/internal/url.js
+++ b/lib/internal/url.js
@@ -1400,6 +1400,31 @@ function getPathFromURL(path) {
   return isWindows ? getPathFromURLWin32(path) : getPathFromURLPosix(path);
 }
 
+function NativeURL(ctx) {
+  this[context] = ctx;
+}
+NativeURL.prototype = URL.prototype;
+
+function constructUrl(flags, protocol, username, password,
+                      host, port, path, query, fragment) {
+  var ctx = new URLContext();
+  ctx.flags = flags;
+  ctx.scheme = protocol;
+  ctx.username = username;
+  ctx.password = password;
+  ctx.port = port;
+  ctx.path = path;
+  ctx.query = query;
+  ctx.fragment = fragment;
+  ctx.host = host;
+  const url = new NativeURL(ctx);
+  url[searchParams] = new URLSearchParams();
+  url[searchParams][context] = url;
+  initSearchParams(url[searchParams], query);
+  return url;
+}
+binding.setURLConstructor(constructUrl);
+
 module.exports = {
   toUSVString,
   getPathFromURL,