callAPIMiddleware.js

export function callAPIMiddleware(store) {
  const { dispatch, getState } = store;
  return next => action => {

    const {
      types,
      callAPI,
      payload = {},
    } = action;

    const state = getState();

    if (!types) {
      // Normal action: pass it on
      return next(action);
    }

    const [requestType, successType, failureType] = types;

    dispatch({ ...payload, type: requestType});

    return callAPI().then(onSuccess, onError);

    function onSuccess(res) {
      dispatch({
        ...payload,
        type: successType,
        body: res.body,
        lastFetched: Date.now()
      });
    }

    function onError(err) {
      dispatch({
        ...payload,
        type: failureType,
        body: err.body
      });
    }
  };
}