accounts-frontend/src/components/user/middlewares/refreshTokenMiddleware.js

// @flow
import {
  ensureToken,
  recoverFromTokenError,
} from 'components/accounts/actions';
import { getActiveAccount } from 'components/accounts/reducer';

/**
 * Ensures, that all user's requests have fresh access token
 *
 * @param {object} store - redux store
 * @param {Function} store.getState
 * @param {Function} store.dispatch
 *
 * @returns {object} - request middleware
 */
export default function refreshTokenMiddleware({
  dispatch,
  getState,
}: {
  dispatch: Object => *,
  getState: () => Object,
}) {
  return {
    before<T: { options: { token?: string }, url: string }>(
      req: T,
    ): Promise<T> {
      const activeAccount = getActiveAccount(getState());
      const disableMiddleware =
        !!req.options.token || req.options.token === null;

      const isRefreshTokenRequest = req.url.includes('refresh-token');

      if (!activeAccount || disableMiddleware || isRefreshTokenRequest) {
        return Promise.resolve(req);
      }

      return dispatch(ensureToken()).then(() => req);
    },

    catch(
      resp: { status: number, message: string },
      req: { options: { token?: string } },
      restart: () => Promise<mixed>,
    ): Promise<*> {
      const disableMiddleware =
        !!req.options.token || req.options.token === null;

      if (disableMiddleware) {
        return Promise.reject(resp);
      }

      return dispatch(recoverFromTokenError(resp)).then(restart);
    },
  };
}