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apps/studio.saladeaula.digital/app/middleware/auth.ts

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+import { userContext } from '@/context'
+import { createSessionStorage } from '@/lib/session'
+
+import { createAuth, type User } from '@/lib/auth'
+import { decodeJwt } from 'jose'
+import { redirect, type LoaderFunctionArgs } from 'react-router'
+import type { OAuth2Strategy } from 'remix-auth-oauth2'
+
+export const authMiddleware = async (
+  { request, context }: LoaderFunctionArgs,
+  next
+): Promise<Response> => {
+  const sessionStorage = createSessionStorage(context.cloudflare.env)
+  const authenticator = createAuth(context.cloudflare.env)
+  const strategy = authenticator.get<OAuth2Strategy<User>>('oidc')
+  const session = await sessionStorage.getSession(request.headers.get('cookie'))
+  let user = session.get('user') as User | null
+
+  session.set('returnTo', new URL(request.url).toString())
+
+  if (!user) {
+    console.log('There is no user logged in')
+
+    return redirect('/login', {
+      headers: new Headers({
+        'Set-Cookie': await sessionStorage.commitSession(session)
+      })
+    })
+  }
+
+  try {
+    const accessToken = decodeJwt(user.accessToken) as { exp: number }
+    const exp = accessToken.exp * 1000
+    const leeway = 30 * 1000
+
+    if (Date.now() > exp - leeway) {
+      // @ts-ignore
+      const tokens = await strategy.refreshToken(user.refreshToken)
+
+      user = {
+        ...user,
+        accessToken: tokens.accessToken(),
+        refreshToken: tokens.refreshToken()
+      }
+
+      session.set('user', user)
+    }
+  } catch (error) {
+    console.error(error)
+    // If refreshing the token fails, remove the user from the current session
+    // so the user is forced to sign in again
+    session.unset('user')
+
+    return redirect('/', {
+      headers: new Headers({
+        'Set-Cookie': await sessionStorage.commitSession(session)
+      })
+    })
+  }
+
+  context.set(userContext, user)
+
+  const response = await next()
+  response.headers.set(
+    'Set-Cookie',
+    await sessionStorage.commitSession(session)
+  )
+  return response
+}