brain/web

computer — web UI

This app runs inside the root Compose stack. The root ../README.md is the single authoritative deployment/operations guide; ../API.md documents the Go API contract. This file covers only what a frontend developer needs.

Ownership boundary: the Go API owns persistence, previews, integrations and authentication semantics; this Next.js server owns browser sessions (NextAuth), the trusted API bridge (lib/api.ts signs short-lived assertions — the browser never supplies a trusted identity), and rendering. Data requests go through app/api/[...path]/route.ts, not local Prisma routes; the pre-port Prisma layer is gone. Schema and seeding live in the Go stack (../db/schema.sql, ../db/migrations/, make seed).

Requirements

• Node.js 20.9 or newer
• Yarn (Corepack: corepack enable)
• A running Go API (API_BASE_URL — server-only Docker DNS, e.g. http://app:8080); the browser uses relative /api/* URLs

Setup

cp .env.example .env          # fill in AUTH_SECRET, NEXTAUTH_URL, API_BASE_URL
yarn install

Run

yarn dev                      # development: http://localhost:3000
yarn build && yarn start      # production

Production deployments run behind the Compose stack and the nginx template in ../deploy/nginx/. The Content-Security-Policy is emitted per response by middleware.ts (nonce-based, so Next's inline bootstrap scripts run); do not add a second script-src policy at the proxy — browsers intersect multiple CSPs and the nonce would be stripped.

Authentication

• Email and password work out of the box. Sign up at /signup. Signup responses are uniform ({ok:true}) for fresh, duplicate and reserved addresses — account existence is never disclosed.
• Authelia OIDC is fail-closed. Setting OIDC_ISSUER, OIDC_CLIENT_ID and OIDC_CLIENT_SECRET only makes the provider appear in configuration; the Go login/callback endpoints deliberately answer 501 until verified external identities are mapped to local users with explicit account-linking rules, and auth.ts rejects Authelia sign-ins until then. Configured variables are NOT working sign-in. See docs/AUTHELIA.md and the root AGENTS.md boundary.
• Sign-out means sign out everywhere: the UI first calls /api/session/revoke (Go tokenVersion bump) and reports honestly when global revocation fails; the NextAuth signOut event is the backstop. Don't remove either path.

Encryption and key retention (operator-relevant)

IMAP mailbox passwords are encrypted with AES-256-GCM. The key derives from the dedicated ENCRYPTION_KEY when set, otherwise from the auth secret (NEXTAUTH_SECRET/AUTH_SECRET). Rows encrypted before ENCRYPTION_KEY existed decrypt via the auth-secret fallback and re-encrypt transparently (compare-and-swap — a concurrent password change always wins). Consequences:

• Back up ENCRYPTION_KEY/AUTH_SECRET with the database; without the matching keys, stored mailbox credentials are unrecoverable.
• Rotating an already-dedicated ENCRYPTION_KEY needs old-key-aware migration, not just a changed environment variable. Keep the old secret until every credential row has been re-encrypted and verified.

Project layout

Path	Contents
app/(app)/	Signed-in screens: pages (primary workspace), bookmark filters (all, calendar, tags, contacts, kanban), collections, settings; /dashboard redirects to /bookmarks
app/api/	Next routes only: the Go proxy ([...path]), NextAuth (auth/*), session revoke; everything else is Go's
app/share/bookmark/[id]	Public read-only bookmark page
components/	UI components
lib/	Server-side API bridge (api.ts), OIDC config, autosave/pagination helpers
middleware.ts	Per-response nonce CSP (review CR-10)
auth.ts	Auth.js configuration
docs/	Integration docs

Notes

• URL previews are fetched server-side by the Go API (internal/preview, guarded by internal/netguard and a shared per-user/global budget) when a bookmark is saved or its URL changes — not by this app and not by open-graph-scraper.
• Date alerts are polled by the browser every 5 minutes and shown as browser notifications; email signal ingestion is Go-side (IMAP).

Admins

Administrator provisioning is operator-driven: list addresses in ADMIN_EMAILS and run make seed (it never changes existing accounts). As a bootstrap convenience the FIRST signup on a fresh installation may be promoted once (AppSetting adminBootstrap, disable with ALLOW_BOOTSTRAP_SIGNUP=0); after bootstrap completes, signup never auto-promotes again — even with no admins left. Promotion of an existing allowlisted user requires emailVerified; DB roles remain authoritative. Admins can open any account via Admin → "View as" (mutations are blocked while impersonating).