[Security] Validate JWT/auth-token in middleware.ts (currently only checks cookie existence)

[nanaf6203-bit]

Problem Statement

src/middleware.ts and middleware.ts (root) check the existence of an auth-token cookie but never validate its cryptographic signature or expiry. Any user can craft a cookie named auth-token with arbitrary content and bypass the protected-route redirect logic for /dashboard, /portfolio, /settings, /invest.

Why It Matters

This is a textbook authentication bypass. Wallet-protected routes exposed by mistake would leak portfolio / KYC / referral information. Even when those pages are wallet-gated client-side, middleware-level authz is critical defence-in-depth.

Acceptance Criteria

• Middleware verifies the token signature via jose.verifyJwt (or next-auth/jwt)
• Expiry (exp) checked and 401 returned on expired tokens
• Clock skew tolerance is bounded
• Unit tests cover signed/expired/tampered/missing tokens
• Routes enforce even if a session is started client-side via wallet

Implementation Notes

Adopt @auth/core or iron-session patterns. Generate a key via openssl rand -hex 32 and store it as AUTH_SECRET in .env. Co-sign with the wallet nonce for cross-check.

Files Likely Affected

• middleware.ts
• src/middleware.ts
• src/hooks/useAuth.ts
• .env.schema (new)

Difficulty / Effort

• Difficulty: Hard
• Effort: T-Shirt L

Labels

security, priority:critical

[Killerjunior]

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[Alhaji-naira]

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[drips-wave]

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