chunithm: Initial implementation code drop

No cleaner development history than this exists. It's difficult to
methodically design something when you don't yet know what it is
you're designing.

src/chunithm/handler/getUserDataEx.ts

@@ -0,0 +1,20 @@
+import { readAimeId } from "../proto/base";
+import { writeUserDataEx } from "../proto/userDataEx";
+import { Repositories } from "../repo";
+import { GetUserDataExRequest } from "../request/getUserDataEx";
+import { GetUserDataExResponse } from "../response/getUserDataEx";
+
+export default async function getUserDataEx(
+  rep: Repositories,
+  req: GetUserDataExRequest
+): Promise<GetUserDataExResponse> {
+  const aimeId = readAimeId(req.userId);
+
+  const profileId = await rep.userData().lookup(aimeId);
+  const userDataEx = await rep.userDataEx().load(profileId);
+
+  return {
+    userId: req.userId,
+    userDataEx: writeUserDataEx(userDataEx),
+  };
+}