docs: def login(self, template='login'):
          '''
          This property will return component which will handle login requests.
  
              auth.login(template='login.html')
          '''
          def _login(env, data):
              form = self._login_form(env)
              next = env.request.GET.get('next', '/')
              login_failed = False
              if env.request.method == 'POST':
                  if form.accept(env.request.POST):
                      user_identity = self.get_user_identity(
                                                  env, **form.python_data)
                      if user_identity is not None:
                          response = HTTPSeeOther(location=next)
                          return self.login_identity(user_identity, response)
                      login_failed = True
              data.form = form
              data.login_failed = login_failed
              data.login_url = env.root.login.as_url.qs_set(next=next)
              return env.template.render_to_response(template, data.as_dict())
          return web.match('/login', 'login') | _login