# Agent

Name: Agent 03 - Authentication And Admin Sessions

Stage: Authentication And Admin Sessions

Date: 2026-04-14

## Scope

Implemented admin authentication and session management on top of the existing `users` and `sessions` tables.

Completed in this stage:

- added auth-related config for bootstrap credentials, session cookie naming, session TTL, and secure-cookie detection from `APP_BASE_URL`;
- implemented bcrypt password hashing and verification in a dedicated `internal/auth` service;
- added admin bootstrap logic that creates the first active admin user from `ADMIN_EMAIL` and `ADMIN_PASSWORD` when no active admin exists yet;
- implemented user/session repository methods for bootstrap lookup, login, session lookup, session touch, and logout invalidation;
- added secure random session token generation with SHA-256 hashed token storage in SQLite;
- wired login and logout handlers plus authenticated session middleware into the existing `chi` route-group structure;
- protected the `/admin` route group with session and role checks;
- replaced the placeholder admin page with a protected authenticated dashboard and added a server-rendered login form;
- added tests for bootstrap behavior and the login/protected-route/logout flow.

## Files Changed

- `/Users/delete/projects/update_server/go.mod`
- `/Users/delete/projects/update_server/go.sum`
- `/Users/delete/projects/update_server/internal/app/app.go`
- `/Users/delete/projects/update_server/internal/config/config.go`
- `/Users/delete/projects/update_server/internal/auth/context.go`
- `/Users/delete/projects/update_server/internal/auth/password.go`
- `/Users/delete/projects/update_server/internal/auth/service.go`
- `/Users/delete/projects/update_server/internal/auth/service_test.go`
- `/Users/delete/projects/update_server/internal/db/errors.go`
- `/Users/delete/projects/update_server/internal/db/models.go`
- `/Users/delete/projects/update_server/internal/db/time.go`
- `/Users/delete/projects/update_server/internal/db/users.go`
- `/Users/delete/projects/update_server/internal/db/sessions.go`
- `/Users/delete/projects/update_server/internal/http/router.go`
- `/Users/delete/projects/update_server/internal/http/render.go`
- `/Users/delete/projects/update_server/internal/http/handlers.go`
- `/Users/delete/projects/update_server/internal/http/auth_handlers.go`
- `/Users/delete/projects/update_server/internal/http/auth_middleware.go`
- `/Users/delete/projects/update_server/internal/http/auth_integration_test.go`
- `/Users/delete/projects/update_server/web/templates/layouts/base.gohtml`
- `/Users/delete/projects/update_server/web/templates/pages/home.gohtml`
- `/Users/delete/projects/update_server/web/templates/pages/admin.gohtml`
- `/Users/delete/projects/update_server/web/templates/pages/login.gohtml`
- `/Users/delete/projects/update_server/web/static/app.css`

## Database Changes

- no schema or migration changes were required in this stage;
- the existing `users` and `sessions` tables from Agent 02 are now actively used for bootstrap, login, session lookup, and logout invalidation;
- session tokens continue to be stored hashed only;
- user `last_login_at` and session `last_seen_at` are now updated by runtime auth flows.

## API Or Route Changes

- added `GET /admin/login` for the server-rendered login form;
- added `POST /admin/login` to authenticate an admin user and issue a session cookie;
- added `POST /admin/logout` to invalidate the current session and clear the cookie;
- changed `/admin` from a public placeholder to a protected route group guarded by session middleware and admin-role checks;
- retained the existing `/api/v1` route scaffold unchanged.

## Commands And Tests Run

- `gofmt -w ./cmd ./internal` - passed;
- `GOCACHE=/tmp/go-build-auth GOMODCACHE=/tmp/go-mod-auth go mod tidy` - initially failed in the sandbox due network/DNS restrictions, then passed after rerunning with approval;
- `GOCACHE=/tmp/go-build-auth GOMODCACHE=/tmp/go-mod-auth go test ./...` - passed;
- `GOCACHE=/tmp/go-build-auth GOMODCACHE=/tmp/go-mod-auth go build -o /tmp/update-server-auth ./cmd/server` - passed;
- `GOCACHE=/tmp/go-build-auth GOMODCACHE=/tmp/go-mod-auth go build -o /tmp/update-migrate-auth ./cmd/migrate` - passed.

## Known Limitations

- CSRF protection is not implemented yet for admin forms; this remains for the hardening stage;
- login rate limiting is not implemented yet;
- bootstrap is environment-driven only in this stage; there is no separate one-time bootstrap CLI yet;
- if no active admin exists and the configured `ADMIN_EMAIL` already belongs to a non-admin user, bootstrap currently logs a warning and leaves that conflict for an operator to resolve;
- there is no admin user-management UI yet beyond the initial bootstrap/login foundation.

## Recommended Next Step

Agent 04 should build project, tag, and release management on top of the now-protected `/admin` route group, reusing the authenticated session context instead of adding a parallel auth path.

## Notes For Validator

- verify that `POST /admin/login` creates a DB-backed session and stores only the token hash in SQLite, not the raw cookie value;
- verify that `/admin` redirects when unauthenticated and succeeds when the issued session cookie is replayed;
- verify that `POST /admin/logout` invalidates the existing session record so the old cookie no longer grants access;
- verify bootstrap behavior both when `ADMIN_EMAIL` and `ADMIN_PASSWORD` are present and when they are absent.
