fix(node/http): remoteAddress and remotePort not being set (#21998)

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Ultimately, it came down to using incorrect property names in the
`FakeSocket` constructor. The values are passed under `remoteAddress`,
not `hostname` and `remotePort` instead of `port`.

Fixes https://github.com/denoland/deno/issues/21980

2 files changed, 33 insertions, 3 deletions

diff --git a/cli/tests/unit_node/http_test.ts b/cli/tests/unit_node/http_test.ts
index 3573416f8..7b2012471 100644
--- a/cli/tests/unit_node/http_test.ts
+++ b/cli/tests/unit_node/http_test.ts
@@ -184,6 +184,30 @@ Deno.test("[node/http] server can respond with 101, 204, 205, 304 status", async
   }
 });
 
+Deno.test("[node/http] IncomingRequest socket has remoteAddress + remotePort", async () => {
+  const { promise, resolve } = Promise.withResolvers<void>();
+
+  let remoteAddress: string | undefined;
+  let remotePort: number | undefined;
+  const server = http.createServer((req, res) => {
+    remoteAddress = req.socket.remoteAddress;
+    remotePort = req.socket.remotePort;
+    res.end();
+  });
+  server.listen(async () => {
+    // deno-lint-ignore no-explicit-any
+    const port = (server.address() as any).port;
+    const res = await fetch(
+      `http://127.0.0.1:${port}/`,
+    );
+    await res.arrayBuffer();
+    assertEquals(remoteAddress, "127.0.0.1");
+    assertEquals(typeof remotePort, "number");
+    server.close(() => resolve());
+  });
+  await promise;
+});
+
 Deno.test("[node/http] request default protocol", async () => {
   const deferred1 = Promise.withResolvers<void>();
   const deferred2 = Promise.withResolvers<void>();
diff --git a/ext/node/polyfills/http.ts b/ext/node/polyfills/http.ts
index 9654d3beb..2da19f7f5 100644
--- a/ext/node/polyfills/http.ts
+++ b/ext/node/polyfills/http.ts
@@ -283,10 +283,16 @@ const kError = Symbol("kError");
 const kUniqueHeaders = Symbol("kUniqueHeaders");
 
 class FakeSocket extends EventEmitter {
-  constructor(opts = {}) {
+  constructor(
+    opts: {
+      encrypted?: boolean | undefined;
+      remotePort?: number | undefined;
+      remoteAddress?: string | undefined;
+    } = {},
+  ) {
     super();
-    this.remoteAddress = opts.hostname;
-    this.remotePort = opts.port;
+    this.remoteAddress = opts.remoteAddress;
+    this.remotePort = opts.remotePort;
     this.encrypted = opts.encrypted;
     this.writable = true;
     this.readable = true;