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OIDC, WebAuthn passkeys, reset emails, tenant membership.","maintainers":[{"name":"glossydev","email":"adam@glossydev.com"}],"readme":"# @allodium/auth\n\nFirst-party authentication you own outright. Sessions, passwords, reset tokens, rate\nlimiting, and a user switcher — extracted from a production SaaS, not written for a\ndemo.\n\nEvery export is a **factory taking explicit config**. The package reads no environment\nvariables and imports no framework, so your app binds names, secrets and tables once\nand re-exports. That is what makes it usable from a Next.js route handler, an Express\nmiddleware, or a script.\n\n```bash\nnpm install @allodium/auth\n# peers, which you almost certainly already have:\nnpm install argon2 pg drizzle-orm\n```\n\nRequires Node 20+ and PostgreSQL.\n\n## What's in it\n\n| | |\n|---|---|\n| **Passwords** | `hashPassword` / `verifyPassword` — argon2id, with a dummy hash for timing equalization so \"no such user\" and \"wrong password\" cost the same. |\n| **Sessions** | `createSessionStore` — opaque tokens, sha256 at rest, single-use refresh rotation that is atomic under concurrency, sliding expiry, cross-surface origin scoping. |\n| **Cookies** | `createSessionCookies` — the access/refresh/CSRF triple, with Domain-correct clearing (the bug where a cookie \"won't delete\" is almost always this). |\n| **Reset tokens** | `createResetTokens` — stateless HMAC, keyed partly on the user's *current* password hash, so a successful reset invalidates every outstanding token with no bookkeeping. |\n| **Rate limiting** | `createRateLimiter` — sliding window, in-process, fail-open. |\n| **Routes** | `createAuthRoutes` — login, logout, refresh and me as Web `Request → Response` handlers, with the details that are easy to get wrong already right. |\n| **Grants** | `createAccessPolicy` / `createGrantLoader` — role × table × action, with optional row filters (`customer_id = $actor.customerId`). What `@allodium/admin` enforces. |\n| **[Act as](../../docs/act-as.md)** | `createActAs` — resolve the app as another user for testing and support, without replacing your session. |\n\n## Sessions in one screen\n\n```ts\nimport { createSessionStore, createSessionCookies } from '@allodium/auth';\n\nexport const sessions = createSessionStore({\n  db,                       // your Drizzle instance\n  sessions: sessionsTable,  // your sessions table — the shape is in sessions.ts\n  users: usersTable,\n  accessPrefix: 'app_at_',  // how these tokens are recognised; unique to your app\n  refreshPrefix: 'app_rt_',\n  isUserActive: (u) => u.status === 'active',\n});\n\nconst minted = await sessions.mint({ userId: user.id, origin: 'web' });\nconst who = await sessions.resolveUser(accessToken, { origin: { equals: 'web' } });\nconst next = await sessions.rotate(refreshToken, { origin: { equals: 'web' } });   // single-use; races have one winner\nawait sessions.revoke({ accessToken, refreshToken });                              // logout: by either token\n```\n\nThe refresh rotation consumes the old token in the same statement that issues the new\none, so two tabs refreshing simultaneously produce exactly one winner rather than two\nvalid sessions or zero. Rotation also refuses a session whose user is no longer active\nand, when scoped, one minted for another surface — a suspended account cannot keep its\nsession alive by refreshing. Revocation matches **either** token, because after a\nrotation in another tab the access cookie is stale while the refresh cookie is live, and\nrevoking by the first one found would delete nothing.\n\n## The four routes\n\n```ts\nimport { createAuthRoutes, createRateLimiter, readCookie, PUBLIC_ACTOR } from '@allodium/auth';\n\nexport const auth = createAuthRoutes({\n  sessions,\n  cookies: createSessionCookies({ names: { access: 'at', refresh: 'rt', expires: 'exp' }, maxAgeSec: 7 * 86400, secure: true }),\n  origin: 'web',                                   // the surface these sessions belong to\n  findUserByEmail: (email) => /* { id, passwordHash, status } | null */,\n  toPublicUser: (row) => ({ id: row.id, email: row.email }),   // REQUIRED: what /me may say\n  actorFor: (id) => grants.actorFor(id, claims),   // optional: roles + claims on /me\n  rateLimit: createRateLimiter(),\n  allowOrigins: ['https://app.example.com'],       // omit for same-origin\n});\n\n// Next.js: app/api/auth/[action]/route.ts → auth.login(req) / auth.logout(req) / auth.refresh(req) / auth.me(req)\n```\n\nWhat they get right so you do not have to: a wrong password and an unknown email answer\nidentically, in the same time; `/me` returns only what `toPublicUser` says; a lost\nrefresh race does not clear the winner's cookies; logout clears cookies only once the\nsession is actually gone (a 500 with cookies intact otherwise); and a POST from an origin\nthat is neither this host nor allowlisted, or with a body not typed as JSON, is refused\n— CORS headers say who may read a response, not who may send a request.\n\n## Grants\n\n```ts\nconst grants = createGrantLoader(pool);            // reads roles / user_roles / role_permissions\nconst policy = await grants.policy();              // cached 30 s; grants.refresh() after editing\nconst actor = await grants.actorFor(userId, { customerId: 42 });\n\npolicy.can(actor, 'orders', 'read');\n// → { allowed: true, scope: [{ column: 'customer_id', op: 'eq', value: 42 }], reason: '…' }\npolicy.can(PUBLIC_ACTOR, 'orders', 'read');\n// → { allowed: false, scope: [], reason: 'no grant for read on orders (holding: public)' }\n```\n\nA `row_filter` on a grant is a JSON array of predicates; `$actor.<claim>` substitutes a\nclaim the app supplied, and a missing claim **denies**. So does a filter that cannot be\nread — `{}` where `[]` was meant — which refuses the whole grant rather than quietly\nwidening it to every row. `policy.problems` lists what was refused and why. A\n`super_admin` role bypasses the model by name and holds no rows.\n\n## Act as (user switching)\n\nA superadmin resolves the whole application as somebody else — one bar, no logging out.\nRead [docs/act-as.md](../../docs/act-as.md) before wiring it; the security model has\nfive properties and they are load-bearing.\n\n```ts\nexport const actAs = createActAs({\n  secret: () => process.env.AUTH_SECRET!,\n  enabled: () => process.env.ACT_AS_ENABLED,      // unset: on in dev, off in prod\n  isDevelopment: () => process.env.NODE_ENV !== 'production',\n  canActAs: (u) => u.role === 'super_admin',\n  loadUser: (id) => findUser(id),\n  userId: (u) => u.id,\n});\n\n// Hook the ONE function your app reads identity from:\nexport async function getCurrentUser() {\n  const real = await sessions.resolve(accessToken);\n  return (await actAs.resolve(real, ticketCookie)).user;\n}\n```\n\nDefaults lean safe: off in production, staff cannot be impersonated, and the ticket\nexpires in 8 hours.\n\n## Design notes\n\n**Factories, not singletons.** Nothing here reads `process.env`. Where a value is\nenv-driven, pass a thunk (`() => process.env.X`) so it keeps call-time semantics rather\nthan being captured at import.\n\n**Peer dependencies.** `argon2`, `pg` and `drizzle-orm` are peers, never bundled — you\ncontrol the versions, and there is no chance of two copies of the driver.\n\n**Directus-compatible hashes.** `verifyPassword` accepts hashes written by Directus, so\na migration off it needs zero forced password resets. That compatibility is deliberate\nand tested.\n\n## Testing\n\n```bash\nnpm test -w packages/auth                 # the whole battery; the database-backed files skip without DATABASE_URL\nnode packages/auth/test/integration.mjs   # sessions, needs DATABASE_URL\nnode packages/auth/test/act-as.mjs        # 42 checks, no database needed\nnode packages/auth/test/loader.mjs        # the grant loader fails closed, no database needed\n```\n\nThe integration battery runs against a real PostgreSQL because that is where the\nsemantics live — an atomic rotation that works against a mock proves nothing.\n\n## License\n\nMIT. No CLA. The software is free forever; that is what the name means.\n","readmeFilename":"README.md"}