---
phase: "02-admin-area-interactive-features"
plan: 01
type: execute
wave: 1
depends_on: []
files_modified:
  - package.json
  - src/proxy.ts
  - src/app/api/auth/[...nextauth]/route.ts
  - src/app/admin/login/page.tsx
  - src/app/admin/login/actions.ts
  - src/lib/auth.ts
  - .env.local
autonomous: true
requirements:
  - ADMIN-01
  - ADMIN-02

must_haves:
  truths:
    - "Admin can POST /admin/login with ADMIN_EMAIL + ADMIN_PASSWORD and receive a session JWT cookie"
    - "Visiting /admin/* without a valid session redirects to /admin/login"
    - "Visiting /c/[token]/* still validates token at edge (proxy.ts unchanged for client routes)"
    - "Session is JWT-based (stateless) — no DB users table involved"
    - "ADMIN_EMAIL and ADMIN_PASSWORD are read from env vars, never hardcoded"
  artifacts:
    - path: "src/lib/auth.ts"
      provides: "NextAuth config — CredentialsProvider validating against ADMIN_EMAIL/ADMIN_PASSWORD env vars"
      contains: "CredentialsProvider"
    - path: "src/app/api/auth/[...nextauth]/route.ts"
      provides: "NextAuth catch-all route handler"
      contains: "NextAuth"
    - path: "src/app/admin/login/page.tsx"
      provides: "Admin login form UI (email + password, submit)"
      min_lines: 30
    - path: "src/proxy.ts"
      provides: "Updated proxy: /c/* token validation + /admin/* session guard"
      contains: "getToken"
  key_links:
    - from: "src/proxy.ts"
      to: "src/app/api/auth/[...nextauth]/route.ts"
      via: "getToken({ req, secret: process.env.NEXTAUTH_SECRET })"
      pattern: "getToken"
    - from: "src/app/admin/login/page.tsx"
      to: "/api/auth/callback/credentials"
      via: "signIn('credentials', { email, password })"
      pattern: "signIn"
    - from: "ADMIN_EMAIL + ADMIN_PASSWORD"
      to: "CredentialsProvider authorize()"
      via: "process.env.ADMIN_EMAIL"
      pattern: "ADMIN_EMAIL"
---

<objective>
**Auth.js Admin Session + Proxy Guard:** Install next-auth@4, configure a CredentialsProvider that validates against ADMIN_EMAIL/ADMIN_PASSWORD env vars, wire the catch-all API route, build the login page, and extend the existing src/proxy.ts to guard /admin/* routes with a session check.

Purpose: Gate the entire admin area behind Auth.js JWT session before any admin UI is built. Two independent auth paths are enforced: /c/[token]/* uses edge token validation (unchanged from Phase 1), /admin/* uses getToken() from next-auth/jwt. No DB users table — single admin, env-var credentials only (per D-01, D-02, D-03, D-04).

Output: Working /admin/login page, session cookie on successful login, automatic redirect to /admin/login for unauthenticated access to any /admin/* route.
</objective>

<execution_context>
@$HOME/.claude/get-shit-done/workflows/execute-plan.md
@$HOME/.claude/get-shit-done/templates/summary.md
</execution_context>

<context>
@.planning/ROADMAP.md
@.planning/phases/02-admin-area-interactive-features/02-CONTEXT.md
@.planning/phases/01-foundation-client-dashboard/01-05-SUMMARY.md

<interfaces>
<!-- Existing proxy from Phase 1 (src/proxy.ts) — EXTEND this file, do not create src/middleware.ts -->
<!-- Current structure: named export `proxy(request)` + config.matcher = ['/c/:path*'] -->
<!-- Next.js requires the export to be named `middleware` — rename proxy→middleware in this task -->
<!-- Phase 2 extends it to also handle /admin/:path* session guard using getToken() from next-auth/jwt -->

Current src/proxy.ts content:
```typescript
import { NextRequest, NextResponse } from 'next/server';

export async function proxy(request: NextRequest) {
  const pathname = request.nextUrl.pathname;

  // Extract token from path: /c/[token]/...
  const tokenMatch = pathname.match(/^\/c\/([a-zA-Z0-9_-]+)/);
  if (!tokenMatch) {
    return NextResponse.rewrite(new URL('/not-found', request.url));
  }

  const token = tokenMatch[1];

  try {
    const validateUrl = new URL(
      `/api/internal/validate-token?token=${encodeURIComponent(token)}`,
      request.url
    );
    const res = await fetch(validateUrl.toString());

    if (!res.ok) {
      return NextResponse.rewrite(new URL('/not-found', request.url));
    }

    return NextResponse.next();
  } catch {
    return NextResponse.rewrite(new URL('/not-found', request.url));
  }
}

export const config = {
  matcher: ['/c/:path*'],
};
```

Note: Next.js middleware MUST be exported as `middleware`, not `proxy`. The Phase 1 file uses `proxy` — this plan must rename it to `middleware` while extending it with /admin/* guard. No src/middleware.ts should ever be created.

From src/db/index.ts:
```typescript
import { drizzle } from "drizzle-orm/postgres-js";
import postgres from "postgres";
export const db = drizzle(client);
```

From src/db/schema.ts (types needed in this plan):
```typescript
// No schema changes needed — no users table. Auth is env-var only.
export type Client = typeof clients.$inferSelect;
```
</interfaces>
</context>

<tasks>

<task type="auto">
  <name>Task 1: Install next-auth@4, create src/lib/auth.ts and NextAuth catch-all route</name>
  <files>
    package.json
    src/lib/auth.ts
    src/app/api/auth/[...nextauth]/route.ts
    .env.local
  </files>
  <action>
    Install next-auth v4 (stable — v5 is still beta RC as of 2026-05-15, per D-01):
    ```
    npm install next-auth@4
    ```

    Add to .env.local (generate NEXTAUTH_SECRET with: `openssl rand -base64 32`):
    ```
    NEXTAUTH_URL=http://localhost:3000
    NEXTAUTH_SECRET=<generated-32-byte-base64-string>
    ADMIN_EMAIL=simone.cavalli.gestione@gmail.com
    ADMIN_PASSWORD=<choose-a-strong-password>
    ```

    Create `src/lib/auth.ts` — NextAuth config, no DB adapter (per D-03):
    ```typescript
    import type { NextAuthOptions } from "next-auth";
    import CredentialsProvider from "next-auth/providers/credentials";

    export const authOptions: NextAuthOptions = {
      providers: [
        CredentialsProvider({
          name: "credentials",
          credentials: {
            email: { label: "Email", type: "email" },
            password: { label: "Password", type: "password" },
          },
          async authorize(credentials) {
            if (!credentials?.email || !credentials?.password) return null;

            const adminEmail = process.env.ADMIN_EMAIL;
            const adminPassword = process.env.ADMIN_PASSWORD;

            if (!adminEmail || !adminPassword) {
              throw new Error("ADMIN_EMAIL and ADMIN_PASSWORD env vars must be set");
            }

            if (
              credentials.email === adminEmail &&
              credentials.password === adminPassword
            ) {
              // Return minimal session user — no DB lookup needed
              return { id: "admin", email: adminEmail, name: "Admin" };
            }

            return null; // null = unauthorized (NextAuth returns 401)
          },
        }),
      ],
      session: {
        strategy: "jwt",       // stateless JWT — no DB session table (per D-03)
        maxAge: 30 * 24 * 60 * 60, // 30 days
      },
      pages: {
        signIn: "/admin/login",   // custom login page (per D-07)
      },
      callbacks: {
        async jwt({ token, user }) {
          if (user) {
            token.id = user.id;
          }
          return token;
        },
        async session({ session, token }) {
          if (session.user) {
            (session.user as { id?: string }).id = token.id as string;
          }
          return session;
        },
      },
    };
    ```

    Create `src/app/api/auth/[...nextauth]/route.ts` — NextAuth catch-all:
    ```typescript
    import NextAuth from "next-auth";
    import { authOptions } from "@/lib/auth";

    const handler = NextAuth(authOptions);

    export { handler as GET, handler as POST };
    ```

    Note: next-auth@4 with App Router uses this export pattern. The handler handles
    GET (session fetch, CSRF) and POST (sign in, sign out).
  </action>
  <verify>
    <automated>grep -q '"next-auth"' package.json && echo "next-auth installed"</automated>
    <automated>test -f src/lib/auth.ts && grep -q "CredentialsProvider" src/lib/auth.ts && echo "CredentialsProvider configured"</automated>
    <automated>grep -q "strategy.*jwt" src/lib/auth.ts && echo "JWT session strategy set"</automated>
    <automated>grep -q "ADMIN_EMAIL" src/lib/auth.ts && echo "ADMIN_EMAIL env var referenced"</automated>
    <automated>test -f src/app/api/auth/\[...nextauth\]/route.ts && grep -q "NextAuth" src/app/api/auth/\[...nextauth\]/route.ts && echo "NextAuth route created"</automated>
    <automated>grep -q "NEXTAUTH_SECRET" .env.local && echo "NEXTAUTH_SECRET in .env.local"</automated>
    <automated>npm run build 2>&1 | grep -v "warning" | grep -qi "error" && echo "BUILD ERRORS" || echo "TypeScript OK"</automated>
  </verify>
  <done>
    - next-auth@4 is in package.json
    - src/lib/auth.ts exports authOptions with CredentialsProvider using env vars
    - src/app/api/auth/[...nextauth]/route.ts exports GET and POST handlers
    - NEXTAUTH_SECRET, ADMIN_EMAIL, ADMIN_PASSWORD are set in .env.local
    - npm run build passes without errors
  </done>
</task>

<task type="auto">
  <name>Task 2: Extend src/proxy.ts to guard /admin/* with session check; create /admin/login page</name>
  <files>
    src/proxy.ts
    src/app/admin/login/page.tsx
    src/app/admin/login/actions.ts
  </files>
  <action>
    **Replace** `src/proxy.ts` entirely. NEVER create src/middleware.ts — it would be a dead file ignored by Next.js since this project uses src/proxy.ts as the middleware entry point. The new file renames the export from `proxy` to `middleware` (required by Next.js) and adds the /admin/* guard alongside the existing /c/* token validation logic (per D-04):

    ```typescript
    import { NextRequest, NextResponse } from "next/server";
    import { getToken } from "next-auth/jwt";

    export async function middleware(request: NextRequest) {
      const pathname = request.nextUrl.pathname;

      // ── ADMIN GUARD ──────────────────────────────────────────────────────────
      if (pathname.startsWith("/admin")) {
        // Allow the login page and NextAuth API routes through without session check
        if (
          pathname === "/admin/login" ||
          pathname.startsWith("/api/auth")
        ) {
          return NextResponse.next();
        }

        const token = await getToken({
          req: request,
          secret: process.env.NEXTAUTH_SECRET,
        });

        if (!token) {
          const loginUrl = new URL("/admin/login", request.url);
          loginUrl.searchParams.set("callbackUrl", pathname);
          return NextResponse.redirect(loginUrl);
        }

        return NextResponse.next();
      }

      // ── CLIENT TOKEN GUARD ───────────────────────────────────────────────────
      if (pathname.startsWith("/c/")) {
        const tokenMatch = pathname.match(/^\/c\/([a-zA-Z0-9_-]+)/);
        if (!tokenMatch) {
          return NextResponse.rewrite(new URL("/not-found", request.url));
        }

        const clientToken = tokenMatch[1];

        try {
          const validateUrl = new URL(
            `/api/internal/validate-token?token=${encodeURIComponent(clientToken)}`,
            request.url
          );
          const res = await fetch(validateUrl.toString());

          if (!res.ok) {
            return NextResponse.rewrite(new URL("/not-found", request.url));
          }

          return NextResponse.next();
        } catch {
          return NextResponse.rewrite(new URL("/not-found", request.url));
        }
      }

      return NextResponse.next();
    }

    export const config = {
      matcher: ["/admin/:path*", "/c/:path*"],
    };
    ```

    Note: The export is renamed from `proxy` to `middleware`. This is the only correct Next.js middleware export name. The /c/* logic is preserved verbatim from Phase 1.

    Create `src/app/admin/login/page.tsx` — login form as Client Component:
    ```typescript
    "use client";

    import { useState } from "react";
    import { signIn } from "next-auth/react";
    import { useRouter, useSearchParams } from "next/navigation";
    import { Button } from "@/components/ui/button";
    import { Input } from "@/components/ui/input";
    import { Label } from "@/components/ui/label";
    import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";

    export default function AdminLoginPage() {
      const router = useRouter();
      const searchParams = useSearchParams();
      const callbackUrl = searchParams.get("callbackUrl") ?? "/admin";

      const [email, setEmail] = useState("");
      const [password, setPassword] = useState("");
      const [error, setError] = useState<string | null>(null);
      const [loading, setLoading] = useState(false);

      async function handleSubmit(e: React.FormEvent) {
        e.preventDefault();
        setLoading(true);
        setError(null);

        const result = await signIn("credentials", {
          email,
          password,
          redirect: false, // handle redirect manually to show errors
        });

        if (result?.error) {
          setError("Email o password non corretti.");
          setLoading(false);
          return;
        }

        router.replace(callbackUrl);
      }

      return (
        <div className="min-h-screen flex items-center justify-center bg-gray-50">
          <Card className="w-full max-w-sm">
            <CardHeader>
              <CardTitle className="text-xl">Admin — ClientHub</CardTitle>
            </CardHeader>
            <CardContent>
              <form onSubmit={handleSubmit} className="space-y-4">
                <div className="space-y-1">
                  <Label htmlFor="email">Email</Label>
                  <Input
                    id="email"
                    type="email"
                    value={email}
                    onChange={(e) => setEmail(e.target.value)}
                    required
                    autoComplete="email"
                  />
                </div>
                <div className="space-y-1">
                  <Label htmlFor="password">Password</Label>
                  <Input
                    id="password"
                    type="password"
                    value={password}
                    onChange={(e) => setPassword(e.target.value)}
                    required
                    autoComplete="current-password"
                  />
                </div>
                {error && (
                  <p className="text-sm text-red-600">{error}</p>
                )}
                <Button type="submit" className="w-full" disabled={loading}>
                  {loading ? "Accesso in corso..." : "Accedi"}
                </Button>
              </form>
            </CardContent>
          </Card>
        </div>
      );
    }
    ```

    Do NOT create src/app/admin/login/actions.ts — the login is handled
    client-side via signIn(). No Server Action file is needed.
  </action>
  <verify>
    <automated>test -f src/proxy.ts && grep -q "getToken" src/proxy.ts && echo "getToken imported in proxy.ts"</automated>
    <automated>grep -q "export async function middleware" src/proxy.ts && echo "export named middleware (not proxy)"</automated>
    <automated>grep -q '"/admin/:path\*"' src/proxy.ts && echo "admin matcher configured"</automated>
    <automated>grep -q '"/c/:path\*"' src/proxy.ts && echo "client matcher still present"</automated>
    <automated>grep -q "pathname === \"/admin/login\"" src/proxy.ts && echo "login page exempted from auth guard"</automated>
    <automated>test -f src/app/admin/login/page.tsx && grep -q "signIn" src/app/admin/login/page.tsx && echo "login page uses signIn"</automated>
    <automated>grep -q '"use client"' src/app/admin/login/page.tsx && echo "login page is Client Component"</automated>
    <automated>test ! -f src/middleware.ts && echo "src/middleware.ts does NOT exist (correct)"</automated>
    <automated>npm run build 2>&1 | grep -v "warning" | grep -qi "error" && echo "BUILD ERRORS" || echo "TypeScript OK"</automated>
  </verify>
  <done>
    - src/proxy.ts guards /admin/* routes: unauthenticated requests redirect to /admin/login?callbackUrl=...
    - Export renamed from proxy to middleware (required by Next.js)
    - /admin/login and /api/auth/* are exempt from the session guard
    - /c/:path* token validation is unchanged
    - /admin/login page renders email+password form, calls signIn('credentials'), shows error on failure, redirects on success
    - src/middleware.ts does NOT exist
    - npm run build passes
    - Manual verification: visiting http://localhost:3000/admin redirects to /admin/login; successful login redirects back to /admin
  </done>
</task>

</tasks>

<threat_model>
## Trust Boundaries

| Boundary | Description |
|----------|-------------|
| Browser → /admin/* | All admin routes gated by JWT session cookie; proxy.ts rejects unauthenticated requests before any page code runs |
| Login form → CredentialsProvider | Email + password transmitted over HTTPS; validated in server-side authorize() only |
| NEXTAUTH_SECRET → JWT signing | All session tokens are HMAC-signed; tampering is detectable |
| ADMIN_EMAIL/ADMIN_PASSWORD → env vars | Credentials never in source code; must be in .env.local and Vercel environment |

## STRIDE Threat Register

| Threat ID | Category | Component | Disposition | Mitigation Plan |
|-----------|----------|-----------|-------------|-----------------|
| T-02-01 | Spoofing | Admin login | mitigate | CredentialsProvider validates against env vars server-side; password never logged; JWT signed with NEXTAUTH_SECRET |
| T-02-02 | Tampering | JWT session cookie | mitigate | next-auth signs JWT with NEXTAUTH_SECRET (HMAC-SHA256); proxy.ts verifies signature on every /admin request via getToken() |
| T-02-03 | Information Disclosure | ADMIN_PASSWORD in env | mitigate | Stored only in .env.local (gitignored) and Vercel environment secrets; never returned in API responses |
| T-02-04 | Elevation of Privilege | /api/auth/* exemption | accept | NextAuth API routes are exempt from session guard by design; they perform their own CSRF and credential validation internally |
| T-02-05 | Denial of Service | Brute-force login | accept | Single admin, not a public product; no rate limiting in v1. If needed in v2, add next-auth rate limit middleware. |
</threat_model>

<verification>
After plan execution:
1. `npm run build` — no TypeScript errors
2. `npm run dev`, visit http://localhost:3000/admin → redirects to /admin/login
3. Submit wrong credentials → error message "Email o password non corretti." appears
4. Submit correct ADMIN_EMAIL + ADMIN_PASSWORD → redirects to /admin (200, even if page is blank)
5. Visit http://localhost:3000/c/any-token → still validates token (client path unchanged)
6. Visit http://localhost:3000/api/auth/session after login → returns `{ user: { email, id: "admin" } }`
7. Confirm src/middleware.ts does not exist in the repo
</verification>

<success_criteria>
- Admin can log in at /admin/login with env-var credentials and receive a JWT session cookie
- All /admin/* routes (except /admin/login and /api/auth/*) redirect unauthenticated visitors to /admin/login
- Client token route /c/:path* is unaffected
- No DB users table exists or is needed
- src/proxy.ts is the middleware file — src/middleware.ts never created
- npm run build passes cleanly
</success_criteria>

<output>
After completion, create `.planning/phases/02-admin-area-interactive-features/02-01-SUMMARY.md`
</output>
