shell: fish functions -> ~/.local/bin executables + bash/zsh ports; manage ~/.agents

- 16 cross-shell utilities converted to sh/bash chezmoi executables: ai c2p cp-appid extract_agents fab gdc gh-sonr-org-migrate ghg-clone ghn gho git-summary launch_omp_livediff_overlay lc-elir mdcp mdp pj (ghg-clone not named ghg: unrelated cargo binary owns that name) - cwd/history helpers stay per-shell: yy c cd clip-last + ghg/ghn/gho cd-wrappers in bash/functions/ and zsh/functions/, loaded by rc files - fish keeps only shell-state functions; converted ones now hit PATH - cp-appid ignore gating moved to .local/bin path - dot_agents/skills: 82 skills materialized from dotstate storage so dot_claude skill symlinks resolve on fresh bootstrap; dotstate profile/symlinks.json released .agents/skills .bashrc .zshrc
2026-11-08 04:57:36 +00:00 · 2026-08-10 15:15:06 -04:00
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+# Authentication and Sessions
+
+## What This Covers
+
+How to remember things about a browser between requests and how to identify a user. Read this when the task involves:
+
+- Storing per-browser state across requests (login, cart, "I have submitted this form")
+- Adding a credentials login flow or an OAuth provider
+- Protecting routes with `requireAuth()` or stacking authorization checks
+- Reading or writing `Session`, `Auth`, or other identity-related context values
+- Logging in, logging out, or rotating session IDs
+
+For raw cookies that are not session-backed (theme, locale, dismissed-banner), see `createCookie` in this file plus the broader `Package Map` in `SKILL.md`.
+
+## Sessions vs Plain Cookies
+
+Reach for `remix/session` when state is sensitive, must be tamper-resistant, or represents the identity of a request: who is logged in, which form a browser already submitted, what items are in a cart. Sessions sign or encrypt their backing cookie with a server-held secret and give you a typed `Session` object you can `get`, `set`, `flash`, `unset`, and `regenerateId`.
+
+Reach for `remix/cookie` directly when the browser is allowed to carry the value and the server does not need session semantics. This often means preferences (theme, locale, dismissed banner), but a signed cookie can also be fine for small low-risk values where you truly only need one cookie-shaped fact and do not need `Session` helpers.
+
+If a malicious user editing the value would be a bug, or if the value needs server-managed lifecycle, reach for a session.
+
+### Quick chooser
+
+| Need                                                                | Best fit        | Why                                                |
+| ------------------------------------------------------------------- | --------------- | -------------------------------------------------- |
+| Theme, locale, dismissed banner                                     | `remix/cookie`  | Browser-controlled preference                      |
+| Small signed hint with minimal lifecycle                            | `remix/cookie`  | One value, no `Session` helpers needed             |
+| "This browser already submitted", cart, flash messages, login state | `remix/session` | Tamper-sensitive, server-managed per-browser state |
+| "One real person only", ownership, durable identity                 | account/auth    | Cookies or sessions alone do not prove personhood  |
+
+## Session Setup
+
+### Create a session cookie
+
+```typescript
+import { createCookie } from 'remix/cookie'
+
+let sessionSecret = process.env.SESSION_SECRET
+if (!sessionSecret && process.env.NODE_ENV !== 'test') {
+  throw new Error('SESSION_SECRET is required')
+}
+
+export let sessionCookie = createCookie('session', {
+  secrets: [sessionSecret ?? 'test-only-secret'],
+  httpOnly: true,
+  sameSite: 'Lax',
+  secure: process.env.NODE_ENV === 'production',
+  maxAge: 2592000, // 30 days
+  path: '/',
+})
+```
+
+The cookie should always be `httpOnly`, default to `sameSite: 'Lax'`, and be `secure` in production. Demo defaults like `'s3cr3t'` are fine in tests but should never reach production — fail fast when the secret is missing.
+
+### Create session storage
+
+```typescript
+// Filesystem storage
+import { createFsSessionStorage } from 'remix/session-storage/fs'
+export let sessionStorage = createFsSessionStorage('./tmp/sessions')
+
+// Memory storage (for tests)
+import { createMemorySessionStorage } from 'remix/session-storage/memory'
+export let sessionStorage = createMemorySessionStorage()
+```
+
+### Add session middleware
+
+```typescript
+import { session } from 'remix/middleware/session'
+
+let router = createRouter({
+  middleware: [
+    session(sessionCookie, sessionStorage),
+    // ... other middleware
+  ],
+})
+```
+
+### Using sessions in handlers
+
+```typescript
+import { Session } from 'remix/session'
+
+async function handler({ get }) {
+  let session = get(Session)
+
+  // Read
+  let userId = session.get('userId')
+
+  // Write
+  session.set('userId', 42)
+
+  // Flash (read once, then cleared)
+  session.flash('message', 'Settings saved!')
+  let message = session.get('message') // returns and clears
+
+  // Remove a key
+  session.unset('userId')
+
+  // Regenerate session ID (after login/logout)
+  session.regenerateId(true)
+}
+```
+
+### Sessions for non-auth state
+
+Sessions are not just for login. They are the right place to store any tamper-sensitive per-browser fact: which form a browser already submitted, how many free actions are left in a trial, which feature flags a tester opted into, what items are in a cart.
+
+```typescript
+async function submit({ get }) {
+  let session = get(Session)
+  if (session.get('hasSubmitted')) {
+    return render(<AlreadySubmittedPage />, { status: 409 })
+  }
+
+  let parsed = s.parseSafe(submitSchema, get(FormData))
+  if (!parsed.success) {
+    return render(<SubmitPage errors={parsed.issues} />, { status: 400 })
+  }
+
+  await saveSubmission(parsed.value)
+  session.set('hasSubmitted', true)
+  session.flash('message', 'Thanks for submitting!')
+
+  return redirect(routes.thanks.href())
+}
+```
+
+Notice that there is no manual `Set-Cookie` plumbing in the action — the session middleware handles that, and the handler returns an ordinary `Response`. Per-browser state enforced this way is still bypassable by clearing cookies; if the guarantee needs to survive that, you also need an account (see auth providers below).
+
+## Auth Middleware
+
+### Basic setup
+
+```typescript
+import { auth, createSessionAuthScheme } from 'remix/middleware/auth'
+import { Session } from 'remix/session'
+import { Database } from 'remix/data-table'
+
+export function loadAuth() {
+  return auth({
+    schemes: [
+      createSessionAuthScheme({
+        read(session) {
+          let data = session.get('auth')
+          return data ?? null
+        },
+        async verify(value, context) {
+          let db = context.get(Database)
+          return (await db.find(users, value.userId)) ?? null
+        },
+        invalidate(session) {
+          session.unset('auth')
+        },
+      }),
+    ],
+  })
+}
+```
+
+### Reading auth state
+
+```typescript
+import { Auth } from 'remix/middleware/auth'
+
+function handler({ get }) {
+  let auth = get(Auth)
+
+  if (auth.ok) {
+    // User is authenticated
+    let user = auth.identity
+  }
+}
+```
+
+## Credentials Auth
+
+### Define a credentials provider
+
+```typescript
+import { createCredentialsAuthProvider, verifyCredentials, completeAuth } from 'remix/auth'
+import * as s from 'remix/data-schema'
+import * as f from 'remix/data-schema/form-data'
+
+let loginSchema = f.object({
+  email: f.field(s.defaulted(s.string(), '')),
+  password: f.field(s.defaulted(s.string(), '')),
+})
+
+export let passwordProvider = createCredentialsAuthProvider({
+  parse(context) {
+    let formData = context.get(FormData)
+    return s.parse(loginSchema, formData)
+  },
+  async verify({ email, password }, context) {
+    let db = context.get(Database)
+    let user = await db.findOne(users, { where: { email } })
+    if (!user || !(await verifyPassword(password, user.password_hash))) {
+      return null
+    }
+    return user
+  },
+})
+```
+
+### Login action
+
+```typescript
+import { verifyCredentials, completeAuth } from 'remix/auth'
+import { redirect } from 'remix/response/redirect'
+
+async action(context) {
+  let user = await verifyCredentials(passwordProvider, context)
+
+  if (user == null) {
+    let session = context.get(Session)
+    session.flash('error', 'Invalid email or password.')
+    return redirect(routes.auth.login.href())
+  }
+
+  let session = completeAuth(context)
+  session.set('auth', { userId: user.id })
+
+  return redirect(routes.home.href())
+},
+```
+
+### Logout action
+
+```typescript
+import { Session } from 'remix/session'
+import { redirect } from 'remix/response/redirect'
+
+function logout(context) {
+  let session = context.get(Session)
+  session.unset('auth')
+  session.regenerateId(true)
+  return redirect(routes.home.href())
+}
+```
+
+## OAuth / External Auth
+
+### Create providers
+
+```typescript
+import {
+  createAtmosphereAuthProvider,
+  createGoogleAuthProvider,
+  createGitHubAuthProvider,
+  startExternalAuth,
+  finishExternalAuth,
+  completeAuth,
+  refreshExternalAuth,
+} from 'remix/auth'
+
+let googleProvider = createGoogleAuthProvider({
+  clientId: process.env.GOOGLE_CLIENT_ID,
+  clientSecret: process.env.GOOGLE_CLIENT_SECRET,
+  redirectUri: new URL(routes.auth.google.callback.href(), origin),
+})
+
+let githubProvider = createGitHubAuthProvider({
+  clientId: process.env.GITHUB_CLIENT_ID,
+  clientSecret: process.env.GITHUB_CLIENT_SECRET,
+  redirectUri: new URL(routes.auth.github.callback.href(), origin),
+})
+
+let atmosphereSessionSecret = process.env.ATMOSPHERE_SESSION_SECRET
+if (!atmosphereSessionSecret && process.env.NODE_ENV !== 'test') {
+  throw new Error('ATMOSPHERE_SESSION_SECRET is required')
+}
+
+let atmosphereProvider = createAtmosphereAuthProvider({
+  clientId: 'https://app.example.com/oauth/client-metadata.json',
+  redirectUri: new URL(routes.auth.atmosphere.callback.href(), origin),
+  sessionSecret: atmosphereSessionSecret ?? 'test-only-secret',
+})
+```
+
+For Atmosphere-compatible atproto OAuth, create the provider once, call `atmosphereProvider.prepare(handleOrDid)` before `startExternalAuth(...)`, then pass the same module-scope provider to `finishExternalAuth(...)` and `refreshExternalAuth(...)`.
+
+### OAuth controller
+
+```typescript
+import { createController } from 'remix/router'
+
+export default createController(routes.auth.google, {
+  actions: {
+    // GET /auth/google — redirect to Google
+    async index(context) {
+      return await startExternalAuth(googleProvider, context, {
+        returnTo: context.url.searchParams.get('returnTo'),
+      })
+    },
+
+    // GET /auth/google/callback — handle redirect back
+    async callback(context) {
+      let { result, returnTo } = await finishExternalAuth(googleProvider, context)
+
+      let db = context.get(Database)
+      let { user, authAccount } = await resolveExternalAuth(db, result)
+
+      let session = completeAuth(context)
+      session.set('auth', {
+        userId: user.id,
+        loginMethod: result.provider,
+        authAccountId: authAccount.id,
+      })
+
+      return redirect(returnTo ?? routes.account.index.href())
+    },
+  },
+})
+```
+
+### Refresh stored provider tokens
+
+Use `refreshExternalAuth(provider, tokens)` when an app has stored OAuth/OIDC tokens and needs a fresh access token from a refresh token. Built-in OIDC providers, X, and Atmosphere support refresh-token exchange. If the provider does not rotate the refresh token, the refreshed bundle preserves the current one.
+
+```typescript
+async function refreshGoogleTokens({ get }) {
+  let db = get(Database)
+  let account = await db.findOne(authAccounts, { where: { provider: 'google' } })
+  if (!account) return null
+
+  let refreshed = await refreshExternalAuth(googleProvider, account.tokens)
+  await db.update(authAccounts, account.id, { tokens: refreshed.tokens })
+
+  return refreshed.tokens
+}
+```
+
+## Protecting Routes
+
+### Controller middleware protection
+
+Apply `requireAuth()` as controller middleware to every action in one controller:
+
+```typescript
+import { createController } from 'remix/router'
+import { requireAuth } from 'remix/middleware/auth'
+
+export default createController(routes.account, {
+  middleware: [requireAuth()],
+  actions: {
+    index() {
+      /* guaranteed authenticated */
+    },
+  },
+})
+```
+
+Nested route maps need their own explicit protection:
+
+```typescript
+// app/router.ts
+router.map(routes.account, accountController)
+router.map(routes.account.settings, accountSettingsController)
+
+// app/actions/account/settings/controller.tsx
+export default createController(routes.account.settings, {
+  middleware: [requireAuth()],
+  actions: {
+    index() {
+      /* guaranteed authenticated */
+    },
+    update() {
+      /* guaranteed authenticated */
+    },
+  },
+})
+```
+
+### Stacking middleware
+
+Combine auth checks with role checks:
+
+```typescript
+export default createController(routes.admin, {
+  middleware: [requireAuth(), requireAdmin()],
+  actions: {
+    index() {
+      /* requires auth + admin */
+    },
+  },
+})
+```
+
+### Action middleware protection
+
+Apply middleware to a single route:
+
+```typescript
+import { Auth, requireAuth } from 'remix/middleware/auth'
+
+router.get(routes.account.index, {
+  middleware: [requireAuth()],
+  handler(context) {
+    let auth = context.get(Auth)
+    return render(<AccountPage identity={auth.identity} />)
+  },
+})
+```
+
+### Redirect on auth failure
+
+```typescript
+import { requireAuth } from 'remix/middleware/auth'
+import { redirect } from 'remix/response/redirect'
+
+export function requireAuthRedirect() {
+  return requireAuth({
+    onFailure(context) {
+      let returnTo = encodeURIComponent(context.url.pathname)
+      return redirect(routes.auth.login.href() + `?returnTo=${returnTo}`, 303)
+    },
+  })
+}
+```