antd pro 统一处理token失效

如果token失效了，后台会有一定的返回，这时前端需要处理（提示重新登录等）。在antd pro中，如果统一通过request请求的，那么可以再reques中统一处理token失效问题：

/**
 * Requests a URL, returning a promise.
 *
 * @param  {string} url       The URL we want to request
 * @param  {object} [option] The options we want to pass to "fetch"
 * @return {object}           An object containing either "data" or "err"
 */
export default function request(url, option) {
  const options = {
    expirys: isAntdPro(),
    ...option,
  };
  /**
   * Produce fingerprints based on url and parameters
   * Maybe url has the same parameters
   */
  const fingerprint = url + (options.body ? JSON.stringify(options.body) : '');
  const hashcode = hash
    .sha256()
    .update(fingerprint)
    .digest('hex');

  const defaultOptions = {
    credentials: 'include',
  };
  const newOptions = { ...defaultOptions, ...options };
  if (
    newOptions.method === 'POST' ||
    newOptions.method === 'PUT' ||
    newOptions.method === 'DELETE'
  ) {
    if (!(newOptions.body instanceof FormData)) {
      newOptions.headers = {
        Accept: 'application/json',
        'Content-Type': 'application/json; charset=utf-8',
        ...newOptions.headers,
      };
      newOptions.body = JSON.stringify(newOptions.body);
    } else {
      // newOptions.body is FormData
      newOptions.headers = {
        Accept: 'application/json',
        ...newOptions.headers,
      };
    }
  }

  const expirys = options.expirys && 60;
  // options.expirys !== false, return the cache,
  if (options.expirys !== false) {
    const cached = sessionStorage.getItem(hashcode);
    const whenCached = sessionStorage.getItem(`${hashcode}:timestamp`);
    if (cached !== null && whenCached !== null) {
      const age = (Date.now() - whenCached) / 1000;
      if (age < expirys) {
        const response = new Response(new Blob([cached]));
        return response.json();
      }
      sessionStorage.removeItem(hashcode);
      sessionStorage.removeItem(`${hashcode}:timestamp`);
    }
  }
  return fetch(url, newOptions)
    .then(checkStatus)
    .then(response => cachedSave(response, hashcode))
    .then(response => {
      // DELETE and 204 do not return data by default
      // using .json will report an error.
      if (newOptions.method === 'DELETE' || response.status === 204) {
        return response.text();
      }

      return response.json();
    })
    .then(response => {
      //如果令牌失效则跳转到登录界面
      if (这里token失效条件){
        // @HACK
        /* eslint-disable no-underscore-dangle */
        window.g_app._store.dispatch({
          type: 'login/logout',
        });
        return response;
      }
      return response;
    })
    .catch(e => {
      const status = e.name;
      if (status === 401) {
        // @HACK
        /* eslint-disable no-underscore-dangle */
        window.g_app._store.dispatch({
          type: 'login/logout',
        });
        return;
      }
      // environment should not be used
      if (status === 403) {
        router.push('/exception/403');
        return;
      }
      if (status <= 504 && status >= 500) {
        router.push('/exception/500');
        return;
      }
      if (status >= 404 && status < 422) {
        router.push('/exception/404');
      }
    });
}