abstraction functions for using window.localStorage via store.js

localStorage.js

// --- abstraction funcs for using LocalStorage via https://github.com/marcuswestin/store.js/ --- 

var base_url = window.location.protocol + '//' + window.location.hostname;
var appConfig = {
    
    duration: {
        expiry: 3 * 60 *1000, // session-expiry period
        warning: 1 * 60 * 1000, // duration before displaying popup
        idle: 1 * 60 * 1000, // IDLE if user stays idle for this period
        checker: 42*1000, // periodic duration used by timeoutChecker
        countdown: 90, // secs... used for interaction to display downCounter
    }
}

// NOTE we use "localStoreData" as jsonObject, and keep it synced with localStorage
var key_localStoreData = "localStoreData";
function getLocalStoreData() {
    var localStoreData = store.get(key_localStoreData);
    if (!localStoreData) {
        localStoreData = {};
    }
    return localStoreData;
}
function setLocalStoreData(localStoreData) {
    if (localStoreData) { // if (localStoreData !== undefined) {// avoid 'undefined'
        store.set(key_localStoreData, localStoreData);
    }
}
function deleteAllLocalStoreData() {
    store.remove(key_localStoreData); // store.clearAll();
}
function getFromLocalStoreData(key) {
    var localStoreData = getLocalStoreData();

    return localStoreData[key];
}
function deleteMultipleFromLocalStoreData(itemKeys) {
    itemKeys.forEach(function(itemKey) {
        deleteFromLocalStoreData(itemKey);
    });
    if (DEBUG) {
        console.log("post-DELETE-multiple... itemKeys -> " + JSON.stringify(itemKeys));
    }
}
function deleteFromLocalStoreData(key) {
    var localStoreData = getLocalStoreData();

    delete localStoreData[key];
    setLocalStoreData(localStoreData);
    if (DEBUG) {
        console.log("post-DELETE... localStoreData -> " + JSON.stringify(localStoreData));
    }
    return localStoreData;
}
function updateLocalStoreData(key, val) {

    var localStoreData = getLocalStoreData();

    if (key && val) {// UPDATE given key-val
        localStoreData[key] = val;
        setLocalStoreData(localStoreData);
        if (DEBUG) {
            console.log("post-UPDATE... localStoreData -> " + JSON.stringify(localStoreData));
        }
        return localStoreData;
    }

    if (localStoreData['duration']) {
        // already INITed, return
        return localStoreData;
    }

    // else.. INIT all the basics with key-val required for the flow
    var currMoment = moment();
    var serverMoment = currMoment; // TODO get this from your server

    localStoreData['duration'] = appConfig.duration;
    localStoreData['offset'] = Number( currMoment.diff(serverMoment) );

    setLocalStoreData(localStoreData);
    if (DEBUG) {
        console.log("post-INIT... localStoreData -> " + JSON.stringify(localStoreData));
    }

    return localStoreData;
}