我弄了一坨史山, 可能在下一个 commit 会撤销更改, 或者继续完善

client/ui/routers/ChatInfoDialogDataLoader.ts

@@ -0,0 +1,20 @@
+import { LoaderFunctionArgs } from "react-router"
+import getClient from "../../getClient"
+import { Chat } from "lingchair-client-protocol"
+import ClientCache from "../../ClientCache"
+
+export default async function ChatInfoDialogDataLoader({ params, request }: LoaderFunctionArgs) {
+    const searchParams = new URL(request.url).searchParams
+
+    let id = searchParams.get('id')
+    const chat = await Chat.getByIdOrThrow(getClient(), id!)
+
+    if (chat.getType() == 'private')
+        id = await chat.getTheOtherUserIdOrThrow()
+
+    return {
+        mySelf: await ClientCache.getMySelf(),
+        chat,
+        id,
+    }
+}