Axios interceptors for token refreshing with multipe async api support

axios-refresh-token.js

import axios from 'axios';
import { Auth } from '.';

let isRefreshing = false;
let refreshSubscribers = [];

axios.interceptors.response.use(response => {
    return response;
}, error => {
    const originalReq = error.config;

    // refersh acess token
    if(error.response.status === 401 && originalReq.config) {

        if(!isRefreshing) {
            isRefreshing = true;

            callRefreshTokenAPI()
            .then((response) => {
                Auth.setAuthToken(response.data) // set access_token & refersh_token
                isRefreshing = false;
                onRefreshed(response.data.access_token);
                refreshSubscribers = [];
            })
        }

        return new Promise((resolve) => {
            subscribeTokenRefresh(token => {
                // replace the expired token and retry
                originalReq.headers['Authorization'] = 'Bearer ' + token;
                resolve(axios(originalReq));
            })
        })

    } else {
        return Promise.reject(error);
    }
});

subscribeTokenRefresh(cb) {
  refreshSubscribers.push(cb);
}

onRefreshed(token) {
  refreshSubscribers.map(cb => cb(token));
}

callRefreshTokenAPI() {
    let access_token = Auth.getAccessToken();

    const requestOptions = {
            headers: {
                'Content-Type': 'application/json',
                'Accept': 'application/json',
                'Authorization' => 'Bearer ' + access_token
            },
        };

        const body = JSON.stringify({
            refresh_token: refresh_token
        });

    return axios.post('http://localhost:8080/api/v1/refresh-token', body, requestOptions);
}