code: def csrf(request):
      
      def _get_val():
          token = get_token(request)
          if token is None:
              # In order to be able to provide debugging info in the
              # case of misconfiguration, we use a sentinel value
              # instead of returning an empty dict.
              return 'NOTPROVIDED'
          else:
              token = force_bytes(token, encoding='latin-1')
              key = force_bytes(
                  get_random_string(len(token)),
                  encoding='latin-1'
              )
              value = b64_encode(xor(token, key))
              return force_text(b'$'.join((key, value)), encoding='latin-1')
      _get_val = lazy(_get_val, text_type)
  
      return {'csrf_token': _get_val()}
docs: Context processor that provides a CSRF token, or the string 'NOTPROVIDED'
      if it has not been provided by either a view decorator or the middleware