code: def login():
      
  
      form_class = _security.login_form
  
      if request.is_json:
          form = form_class(MultiDict(request.get_json()))
      else:
          form = form_class(request.form)
  
      if form.validate_on_submit():
          login_user(form.user, remember=form.remember.data)
          after_this_request(_commit)
  
          if not request.is_json:
              return redirect(get_post_login_redirect(form.next.data))
  
      if request.is_json:
          return _render_json(form, include_auth_token=True)
  
      return _security.render_template(config_value('LOGIN_USER_TEMPLATE'),
                                       login_user_form=form,
                                       **_ctx('login'))
docs: View function for login view