initial commit

server/utils/oidc.js

@@ -0,0 +1,74 @@
+import * as oidc from 'openid-client'
+
+const CACHE_TTL_MS = 60 * 60 * 1000
+const configCache = new Map()
+
+function getRedirectUri() {
+  const explicit
+    = process.env.OIDC_REDIRECT_URI ?? process.env.OPENID_REDIRECT_URI ?? ''
+  if (explicit.trim()) return explicit.trim()
+  const base = process.env.NUXT_APP_URL || process.env.APP_URL || ''
+  if (base) return `${base.replace(/\/$/, '')}/api/auth/oidc/callback`
+  const host = process.env.HOST || 'localhost'
+  const port = process.env.PORT || '3000'
+  const protocol = process.env.NODE_ENV === 'production' ? 'https' : 'http'
+  return `${protocol}://${host}:${port}/api/auth/oidc/callback`
+}
+
+export async function getOidcConfig() {
+  const issuer = process.env.OIDC_ISSUER
+  const clientId = process.env.OIDC_CLIENT_ID
+  const clientSecret = process.env.OIDC_CLIENT_SECRET
+  if (!issuer || !clientId || !clientSecret) return null
+  const key = issuer
+  const cached = configCache.get(key)
+  if (cached && Date.now() < cached.expires) return cached.config
+  const server = new URL(issuer)
+  const config = await oidc.discovery(
+    server,
+    clientId,
+    undefined,
+    oidc.ClientSecretPost(clientSecret),
+    { timeout: 5000 },
+  )
+  configCache.set(key, { config, expires: Date.now() + CACHE_TTL_MS })
+  return config
+}
+
+export function getOidcRedirectUri() {
+  return getRedirectUri()
+}
+
+export function constantTimeCompare(a, b) {
+  if (typeof a !== 'string' || typeof b !== 'string' || a.length !== b.length) return false
+  let out = 0
+  for (let i = 0; i < a.length; i++) out |= a.charCodeAt(i) ^ b.charCodeAt(i)
+  return out === 0
+}
+
+export function createOidcParams() {
+  return {
+    state: oidc.randomState(),
+    nonce: oidc.randomNonce(),
+    codeVerifier: oidc.randomPKCECodeVerifier(),
+  }
+}
+
+export async function getCodeChallenge(verifier) {
+  return oidc.calculatePKCECodeChallenge(verifier)
+}
+
+export function validateRedirectPath(redirect) {
+  if (typeof redirect !== 'string' || !redirect.startsWith('/') || redirect.startsWith('//')) return '/'
+  const path = redirect.split('?')[0]
+  if (path.includes('//')) return '/'
+  return redirect
+}
+
+export function buildAuthorizeUrl(config, params) {
+  return oidc.buildAuthorizationUrl(config, params)
+}
+
+export async function exchangeCode(config, currentUrl, checks) {
+  return oidc.authorizationCodeGrant(config, currentUrl, checks)
+}