Axios interceptors and asynchronous login

Question

I\'m implementing token authentication in my web app. My access token expires every N minutes and than a refresh token is used to log in and get a

Answer 1

Just use another promise :D

axios.interceptors.response.use(undefined, function (err) {
    return new Promise(function (resolve, reject) {
        if (err.status === 401 && err.config && !err.config.__isRetryRequest) {
            serviceRefreshLogin(
                getRefreshToken(),
                success => { 
                        setTokens(success.access_token, success.refresh_token) 
                        err.config.__isRetryRequest = true
                        err.config.headers.Authorization = 'Bearer ' + getAccessToken();
                        axios(err.config).then(resolve, reject);
                },
                error => { 
                    console.log('Refresh login error: ', error);
                    reject(error); 
                }
            );
        }
        throw err;
    });
});

If your enviroment doesn't suport promises use polyfill, for example https://github.com/stefanpenner/es6-promise

But, it may be better to rewrite getRefreshToken to return promise and then make code simpler

axios.interceptors.response.use(undefined, function (err) {

        if (err.status === 401 && err.config && !err.config.__isRetryRequest) {
            return getRefreshToken()
            .then(function (success) {
                setTokens(success.access_token, success.refresh_token) ;                   
                err.config.__isRetryRequest = true;
                err.config.headers.Authorization = 'Bearer ' + getAccessToken();
                return axios(err.config);
            })
            .catch(function (error) {
                console.log('Refresh login error: ', error);
                throw error;
            });
        }
        throw err;
});

Demo https://plnkr.co/edit/0ZLpc8jgKI18w4c0f905?p=preview