api.js

export const settings = {
    host: ''
};


export function getUserData() {
    const user = sessionStorage.getItem('user');

    if (user) {
        return JSON.parse(user);
    } else {
        return undefined;
    }
}

function setUserData(user) {
    sessionStorage.setItem('user', JSON.stringify(user));
}

function clearUserData(user) {
    sessionStorage.removeItem('user');

}

async function request(url, options) {
    try {
        const response = await fetch(url, options);

        if (response.ok == false) {
            const error = await response.json();
            throw new Error(error.message);
        }

        try {
            const data = await response.json();
            return data;
        } catch (err) {
            return response;
        }
    } catch (err) {
        //alert(err.message);
        throw err;
    }
}

function createOptions(method = 'get', body) {
    const options = {
        method,
        headers: {}
    }

    const user = getUserData();

    if (user) {
        options.headers['X-Authorization'] = user.accessToken;
    }
    if (body) {
        options.headers['Content-Type'] = 'application/json';
        options.body = JSON.stringify(body);
    }

    return options;
}



async function get(url) {
    return await request(url, createOptions());
}

async function post(url, data) {
    return await request(url, createOptions('post', data));
}

async function put(url, data) {
    return await request(url, createOptions('put', data));
}

async function del(url) {
    return await request(url, createOptions('delete'));
}

async function login(username, password) {
    const result = await post(settings.host + '/users/login', { username, password });
    setUserData(result);
    return result;
}

async function register(username, password) {
    const result = await post(settings.host + '/users/register', { username, password });

    setUserData(result);
    return result;
}

export function logout() {
    const result = get(settings.host + '/users/logout');
    clearUserData();
    return result;
}