login handler

    handleSubmitJwtAuth = (e) => {
        e.preventDefault()

        const { username, password } = this.state
        const user = { username, password } 

        fetch(`${config.API_ENDPOINT}/auth/login`, {
            method: 'POST',
            headers: {
                'content-type': 'application/json'
            },
            body: JSON.stringify(user),
        })
            .then(res => {
                return (!res.ok)
                    ? res.json().then(e => Promise.reject(e))
                    : res.json()
            })
            .then(user => {
                TokenService.saveAuthToken(user.authToken)
                // console.log("saveAuthToken fired")
                this.props.history.push("/locations")
                this.context.updateAuthToken()
            })
            .catch(error => {
                console.log(error)
                this.setState({ error })
            })
    }