initial commit

server/api/auth/oidc/callback.get.js

@@ -0,0 +1,96 @@
+import { getCookie, deleteCookie, setCookie, getRequestURL } from 'h3'
+import {
+  getOidcConfig,
+  constantTimeCompare,
+  validateRedirectPath,
+  exchangeCode,
+} from '../../../utils/oidc.js'
+import { getDb } from '../../../utils/db.js'
+import { getSessionMaxAgeDays } from '../../../utils/session.js'
+
+const DEFAULT_ROLE = process.env.OIDC_DEFAULT_ROLE || 'member'
+
+function getIdentifier(claims) {
+  return claims?.email ?? claims?.preferred_username ?? claims?.name ?? claims?.sub ?? 'oidc-user'
+}
+
+export default defineEventHandler(async (event) => {
+  const query = getQuery(event)
+  const code = query?.code
+  const state = query?.state
+  if (!code || !state) throw createError({ statusCode: 400, message: 'Invalid request' })
+
+  const cookieRaw = getCookie(event, 'oidc_state')
+  if (!cookieRaw) throw createError({ statusCode: 400, message: 'Invalid request' })
+  let stored
+  try {
+    stored = JSON.parse(cookieRaw)
+  }
+  catch {
+    throw createError({ statusCode: 400, message: 'Invalid request' })
+  }
+  if (!stored?.state || !constantTimeCompare(state, stored.state)) {
+    throw createError({ statusCode: 400, message: 'Invalid request' })
+  }
+
+  const config = await getOidcConfig()
+  if (!config) throw createError({ statusCode: 500, message: 'OIDC not configured' })
+
+  const currentUrl = getRequestURL(event)
+  const checks = {
+    expectedState: state,
+    expectedNonce: stored.nonce,
+    pkceCodeVerifier: stored.codeVerifier,
+  }
+
+  let tokens
+  try {
+    tokens = await exchangeCode(config, currentUrl, checks)
+  }
+  catch {
+    deleteCookie(event, 'oidc_state', { path: '/' })
+    throw createError({ statusCode: 401, message: 'Authentication failed' })
+  }
+
+  deleteCookie(event, 'oidc_state', { path: '/' })
+
+  const claims = tokens.claims?.()
+  if (!claims?.sub) throw createError({ statusCode: 401, message: 'Authentication failed' })
+
+  const issuer = process.env.OIDC_ISSUER ?? ''
+  const { get, run } = await getDb()
+  let user = await get(
+    'SELECT id, identifier, role FROM users WHERE oidc_issuer = ? AND oidc_sub = ?',
+    [issuer, claims.sub],
+  )
+  if (!user) {
+    const id = crypto.randomUUID()
+    const now = new Date().toISOString()
+    const identifier = getIdentifier(claims)
+    await run(
+      'INSERT INTO users (id, identifier, password_hash, role, created_at, auth_provider, oidc_issuer, oidc_sub) VALUES (?, ?, ?, ?, ?, ?, ?, ?)',
+      [id, identifier, null, DEFAULT_ROLE, now, 'oidc', issuer, claims.sub],
+    )
+    user = await get('SELECT id, identifier, role FROM users WHERE id = ?', [id])
+  }
+
+  const sessionDays = getSessionMaxAgeDays()
+  const sid = crypto.randomUUID()
+  const now = new Date()
+  const expires = new Date(now.getTime() + sessionDays * 24 * 60 * 60 * 1000)
+  await run(
+    'INSERT INTO sessions (id, user_id, created_at, expires_at) VALUES (?, ?, ?, ?)',
+    [sid, user.id, now.toISOString(), expires.toISOString()],
+  )
+  setCookie(event, 'session_id', sid, {
+    httpOnly: true,
+    sameSite: 'strict',
+    path: '/',
+    maxAge: sessionDays * 24 * 60 * 60,
+    secure: process.env.NODE_ENV === 'production',
+  })
+
+  const redirectParam = query?.redirect
+  const path = validateRedirectPath(redirectParam)
+  return sendRedirect(event, path.startsWith('http') ? path : new URL(path, getRequestURL(event).origin).href, 302)
+})