---
phase: 36
plan: 02
title: "Client /admin route, admin shell with sidebar, UserMenu admin link"
type: execute
wave: 2
depends_on:
  - 36-01
files_modified:
  - src/client/routes/admin.tsx
  - src/client/routes/admin/index.tsx
  - src/client/hooks/useAuth.ts
  - src/client/components/UserMenu.tsx
  - src/client/routes/__root.tsx
autonomous: true
requirements:
  - ADMN-01
---

<objective>
Create the client-side `/admin` route with a beforeLoad guard that redirects non-admin users to home, build the admin shell with a sidebar (Items + Tags nav items, both disabled/coming-soon), create the placeholder admin index view, update the AuthState type to include isAdmin, and add a conditional Admin link to the UserMenu.
</objective>

<threat_model>
**Threat:** A non-admin authenticated user navigates directly to /admin in the browser.
**Mitigation:** `beforeLoad` guard in the /admin route reads `isAdmin` from the auth query cache and throws a `redirect({ to: "/" })` if false — the component never renders. Belt-and-suspenders: server also returns 403 on /api/admin/* endpoints.

**Threat:** Admin link is shown to non-admin users due to a stale auth cache.
**Mitigation:** `useAuth()` has `staleTime: 5 * 60 * 1000` — a non-admin can only see the link if auth cache is stale AND isAdmin was previously true. Risk is negligible since server always enforces the 403 check.
</threat_model>

<tasks>

<task id="36-02-T1">
<type>execute</type>
<title>Update AuthState interface in useAuth.ts to include isAdmin</title>
<files>
  src/client/hooks/useAuth.ts
</files>
<read_first>
  - src/client/hooks/useAuth.ts — read the full file to see the AuthState interface and existing hook structure
</read_first>
<action>
In `src/client/hooks/useAuth.ts`, update the `AuthState` interface to include `isAdmin`:

Current:
```typescript
interface AuthState {
  user: { id: string; email?: string; createdAt?: string } | null;
  authenticated: boolean;
}
```

Updated:
```typescript
interface AuthState {
  user: { id: string; email?: string; createdAt?: string; isAdmin?: boolean } | null;
  authenticated: boolean;
}
```

No other changes needed. The `useAuth()` hook fetches from `/api/auth/me` which now returns `isAdmin` after plan 36-01.
</action>
<acceptance_criteria>
  - src/client/hooks/useAuth.ts AuthState interface includes `isAdmin?: boolean` in the user object type
</acceptance_criteria>
</task>

<task id="36-02-T2">
<type>execute</type>
<title>Create admin route directory and admin layout route (admin.tsx)</title>
<files>
  src/client/routes/admin.tsx
  src/client/routes/admin/
</files>
<read_first>
  - src/client/routes/__root.tsx — understand the existing route structure and TanStack Router patterns (createRootRoute, Outlet, beforeLoad pattern)
  - src/client/routes/settings.tsx — read as an example of a simple protected route pattern
  - src/client/lib/iconData.ts — verify LucideIcon import path
  - src/client/hooks/useAuth.ts — verify useAuth import path
</read_first>
<action>
Create `src/client/routes/admin.tsx` — the admin layout route (shell with sidebar).

**Context:** The router in `src/client/main.tsx` is created with `context: {}` (empty) — the queryClient is NOT passed via router context. Use the component-level guard pattern (useEffect + navigate) rather than beforeLoad.

```typescript
import { createFileRoute, Outlet, useNavigate } from "@tanstack/react-router";
import { useEffect } from "react";
import { useAuth } from "../hooks/useAuth";
import { LucideIcon } from "../lib/iconData";

export const Route = createFileRoute("/admin")({
  component: AdminLayout,
});

function AdminLayout() {
  const navigate = useNavigate();
  const { data: auth, isLoading } = useAuth();

  useEffect(() => {
    if (!isLoading && !auth?.user?.isAdmin) {
      navigate({ to: "/" });
    }
  }, [auth, isLoading, navigate]);

  // Don't render the shell until auth is confirmed
  if (isLoading || !auth?.user?.isAdmin) return null;

  return (
    <div className="flex min-h-[calc(100vh-3.5rem)]">
      {/* Sidebar */}
      <aside className="w-56 border-r border-gray-100 bg-white p-4 flex flex-col gap-1 shrink-0">
        <p className="text-xs font-semibold text-gray-400 uppercase tracking-wide mb-3">
          Admin
        </p>

        {/* Items — disabled (phase 37) */}
        <div
          className="flex items-center gap-2 px-3 py-2 rounded-lg text-sm text-gray-300 cursor-not-allowed"
          title="Coming in a future release"
        >
          <LucideIcon name="package" size={16} />
          <span>Items</span>
          <span className="ml-auto text-xs bg-gray-100 text-gray-400 px-1.5 py-0.5 rounded">
            Soon
          </span>
        </div>

        {/* Tags — disabled (phase 38) */}
        <div
          className="flex items-center gap-2 px-3 py-2 rounded-lg text-sm text-gray-300 cursor-not-allowed"
          title="Coming in a future release"
        >
          <LucideIcon name="tag" size={16} />
          <span>Tags</span>
          <span className="ml-auto text-xs bg-gray-100 text-gray-400 px-1.5 py-0.5 rounded">
            Soon
          </span>
        </div>
      </aside>

      {/* Main content */}
      <main className="flex-1 p-6 bg-gray-50">
        <Outlet />
      </main>
    </div>
  );
}
```
</action>
<acceptance_criteria>
  - src/client/routes/admin.tsx exists and exports a Route created with `createFileRoute("/admin")`
  - The component renders a sidebar with "Admin" heading
  - The sidebar contains two disabled nav items: one with icon "package" labeled "Items" and one with icon "tag" labeled "Tags"
  - Both disabled items have a "Soon" badge
  - The component renders `<Outlet />` in the main content area
  - Non-admin users are redirected (either via beforeLoad redirect or useEffect navigate) to "/"
</acceptance_criteria>
</task>

<task id="36-02-T3">
<type>execute</type>
<title>Create admin/index.tsx placeholder content</title>
<files>
  src/client/routes/admin/index.tsx
</files>
<read_first>
  - src/client/routes/admin.tsx — confirm the route structure so the index matches correctly
  - src/client/lib/iconData.ts — verify LucideIcon import path
</read_first>
<action>
Create the `src/client/routes/admin/` directory and `src/client/routes/admin/index.tsx`:

```typescript
import { createFileRoute } from "@tanstack/react-router";
import { LucideIcon } from "../../lib/iconData";

export const Route = createFileRoute("/admin/")({
  component: AdminIndex,
});

function AdminIndex() {
  return (
    <div className="flex flex-col items-center justify-center h-64 text-center">
      <LucideIcon name="shield" size={32} className="text-gray-300 mb-3" />
      <p className="text-sm text-gray-500">Admin Panel</p>
      <p className="text-xs text-gray-400 mt-1">
        Select a section from the sidebar
      </p>
    </div>
  );
}
```
</action>
<acceptance_criteria>
  - src/client/routes/admin/index.tsx exists
  - It exports a Route with `createFileRoute("/admin/")`
  - The component renders a centered placeholder with a "shield" icon, "Admin Panel" text, and a subtext
</acceptance_criteria>
</task>

<task id="36-02-T4">
<type>execute</type>
<title>Add conditional Admin link to UserMenu</title>
<files>
  src/client/components/UserMenu.tsx
</files>
<read_first>
  - src/client/components/UserMenu.tsx — read the full file to understand the existing menu structure, Link usage, and auth data access
  - src/client/hooks/useAuth.ts — confirm that auth.user.isAdmin is now typed
</read_first>
<action>
In `src/client/components/UserMenu.tsx`, add a conditional Admin link as the first item in the dropdown menu (before the Profile link).

The `auth` variable is already read via `const { data: auth } = useAuth();`.

Update the menu dropdown JSX to add the Admin link before the Profile link:

```tsx
{open && (
  <div className="absolute right-0 mt-1 w-40 bg-white rounded-lg shadow-lg border border-gray-200 py-1 z-50">
    {/* Admin link — only visible to admin users */}
    {auth?.user?.isAdmin && (
      <>
        <Link
          to="/admin"
          onClick={() => setOpen(false)}
          className="flex items-center gap-2 px-3 py-2 text-sm text-gray-700 hover:bg-gray-50 transition-colors"
        >
          <LucideIcon name="shield" size={16} className="text-gray-400" />
          Admin
        </Link>
        <div className="border-t border-gray-100 my-1" />
      </>
    )}
    {/* Existing links below unchanged */}
    <Link
      to="/profile"
      onClick={() => setOpen(false)}
      className="flex items-center gap-2 px-3 py-2 text-sm text-gray-700 hover:bg-gray-50 transition-colors"
    >
      ...
    </Link>
    ...
  </div>
)}
```

Keep all existing menu items unchanged. Only add the Admin link + divider at the top, conditionally rendered.
</action>
<acceptance_criteria>
  - src/client/components/UserMenu.tsx renders an Admin link when `auth?.user?.isAdmin` is true
  - The Admin link uses `to="/admin"` and renders a "shield" LucideIcon
  - A `border-t border-gray-100` divider separates Admin from the Profile link
  - When `auth?.user?.isAdmin` is false or undefined, the Admin link and its divider are not rendered
  - All existing menu items (Profile, Settings, Sign out) remain unchanged
</acceptance_criteria>
</task>

<task id="36-02-T5">
<type>execute</type>
<title>Add /admin to public route allowlist in __root.tsx</title>
<files>
  src/client/routes/__root.tsx
</files>
<read_first>
  - src/client/routes/__root.tsx — read the isPublicRoute logic and the auth guard that redirects to /login
</read_first>
<action>
In `src/client/routes/__root.tsx`, update the `isPublicRoute` check to include `/admin` so the root layout does NOT redirect admin users to `/login` before the admin route's own guard can run.

Current:
```typescript
const isPublicRoute =
  location.pathname === "/" ||
  location.pathname.startsWith("/users/") ||
  ...
  location.pathname === "/login" || ...
```

The issue: If an admin navigates to `/admin`, the root layout runs `if (!isAuthenticated && !isPublicRoute) navigate({ to: "/login" })`. For admin users who ARE authenticated, this is not a problem. But to be safe and explicit, the `/admin` route should be treated as a **protected** route (not public). The root layout's auth guard redirects unauthenticated users to `/login`, which is correct behavior for `/admin`.

**Action:** No change needed to `isPublicRoute` — the current logic already handles authenticated users correctly (the guard only fires for unauthenticated users). The admin route's own guard handles the isAdmin check.

However, verify that `src/client/routes/__root.tsx` does NOT exclude `/admin` from the auth guard in a way that would allow unauthenticated access. Read the file and confirm no changes are needed. If the existing `isPublicRoute` logic would incorrectly allow `/admin` access without auth, add:
```typescript
// /admin is NOT a public route — root auth guard handles unauthenticated redirect
// admin.tsx beforeLoad handles non-admin redirect
```
as a comment to clarify intent. No code change if logic is already correct.
</action>
<acceptance_criteria>
  - src/client/routes/__root.tsx is unchanged OR has a clarifying comment
  - The /admin route is NOT in the isPublicRoute list (it requires authentication)
  - An unauthenticated user navigating to /admin is redirected to /login by the root guard
  - An authenticated non-admin navigating to /admin is redirected to / by the admin route's guard
</acceptance_criteria>
</task>

</tasks>

<verification>
1. `bun run build` exits 0 — no TypeScript errors in new route files
2. The route tree is regenerated — `routeTree.gen.ts` includes `/admin` and `/admin/` routes
3. src/client/hooks/useAuth.ts AuthState interface includes `isAdmin?: boolean`
4. src/client/routes/admin.tsx exists with createFileRoute("/admin")
5. src/client/routes/admin/index.tsx exists with createFileRoute("/admin/")
6. src/client/components/UserMenu.tsx conditionally renders Admin link when isAdmin is true
7. Manual verification: admin user sees Admin link in UserMenu; non-admin does not
</verification>

<must_haves>
- /admin route exists and is guarded against non-admin users
- Admin shell renders sidebar with Items and Tags (disabled)
- Admin index placeholder renders inside the shell
- Admin link appears in UserMenu only when isAdmin is true
- TypeScript type for isAdmin propagated through AuthState
</must_haves>

<success_criteria>
- [ ] src/client/routes/admin.tsx exists with createFileRoute("/admin") and guard logic
- [ ] src/client/routes/admin/index.tsx exists with placeholder UI
- [ ] Admin sidebar renders "Items" (package icon) and "Tags" (tag icon) both disabled with "Soon" badge
- [ ] Non-admin redirect is implemented (beforeLoad or useEffect)
- [ ] UserMenu shows Admin link when auth.user.isAdmin is true
- [ ] bun run build exits 0
- [ ] routeTree.gen.ts includes /admin route
</success_criteria>
