refactor: remove doc URL parameter, single document per Space

Always use "default" as the document name. One Space = one article.

Made-with: Cursor

README.md

@@ -32,4 +32,4 @@ cd frontend && npm install && npm run dev
 
 Open http://localhost:5173. Open a second tab to see collaboration in action.
 
-Use `?doc=my-article` to create/join a specific document.
+The app uses a single shared document (`default`).

backend/src/server.ts

@@ -24,6 +24,9 @@ const __dirname = dirname(fileURLToPath(import.meta.url));
 const DATA_DIR = join(__dirname, "..", "data");
 const PORT = parseInt(process.env.PORT || "8080", 10);
 
+/** Single collab document; URL `?doc=` is not supported. */
+const DEFAULT_DOC_NAME = "default";
+
 mkdirSync(DATA_DIR, { recursive: true });
 
 function docPath(name: string) {
@@ -157,14 +160,8 @@ app.post("/api/publish", async (req, res) => {
     }
   }
 
-  const { docName } = req.body as { docName?: string };
-  if (!docName) {
-    res.status(400).json({ error: "docName is required" });
-    return;
-  }
-
   try {
-    const result = await publishDocument(docName);
+    const result = await publishDocument(DEFAULT_DOC_NAME);
     if (!result.success) {
       res.status(500).json({ error: result.error || "Publish failed" });
       return;
@@ -260,11 +257,6 @@ const staticDir =
     ? join(__dirname, "..", "frontend-dist")
     : join(__dirname, "..", "..", "frontend", "dist");
 
-function getDocName(req: express.Request): string {
-  const raw = (req.query.doc as string) || "default";
-  return raw.replace(/[^a-zA-Z0-9_-]/g, "_");
-}
-
 function getPublishedPath(docName: string): string {
   return join(DATA_DIR, "published", docName, "index.html");
 }
@@ -310,7 +302,6 @@ if (existsSync(staticDir)) {
 
       if (!user || !user.canEdit) {
         // Not logged in or no write access → redirect to OAuth login
-        const docParam = req.query.doc ? `?doc=${req.query.doc}` : "";
         res.redirect(`/oauth/authorize`);
         return;
       }
@@ -328,8 +319,7 @@ if (existsSync(staticDir)) {
     }
 
     // In production with OAuth: serve the published article if it exists
-    const docName = getDocName(req);
-    const publishedPath = getPublishedPath(docName);
+    const publishedPath = getPublishedPath(DEFAULT_DOC_NAME);
 
     if (existsSync(publishedPath)) {
       res.sendFile(publishedPath);

frontend/src/App.tsx

@@ -55,10 +55,7 @@ export default function App() {
     color: randomColor(),
   }));
 
-  const [docName] = useState(() => {
-    const params = new URLSearchParams(window.location.search);
-    return params.get("doc") || "default";
-  });
+  const docName = "default";
 
   const editorRef = useRef<TiptapEditor | null>(null);
   const editorContainerRef = useRef<HTMLDivElement | null>(null);