auth.pug

doctype html
html(lang="en")
  head
  title Granting Access
  body
  h3 #{client_id} is requesting access to your account.
  p.
    Sign in to grant #{client_id} access.
  form(action='/signin', method='POST')
    p.
      Username 
    input(type='text' name='username')
    p.
      Password 
    input(type='password' name='password')
    input(type='hidden' name='client_id' value=client_id)
    input(type='hidden' name='redirect_uri' value=redirect_url)
    input(type='hidden' name='response_type' value=response_type)

    input(type='submit' name='submit')

    if state
      input(type='hidden' name='state' value=state)
    if nonce
      input(type='hidden' name='nonce' value=nonce)
    if scope
      input(type='hidden' name='scope' value=scope)

    if code_challenge
      input(type='hidden' name='code_challenge' value=code_challenge)
      input(type='hidden' name='code_challenge_method' value=code_challenge_method)