expire localStorage

expLocalStorage.js

class ExpLocalStorage {
    constructor() {
        this.now = Math.floor(Date.now() / 1000);

        this.initialize();
    }

    initialize() {
        if(!window || !window.localStorage) {
            throw new Error("@@ localStorage is not available")
        }

        this.deleteExpiredStorage();
    }

    keyName(key) {
        return key.split('_')[1];
    }

    keyExpTime(key) {
        return Number(key.split('_').pop());
    }

    set(key, value, expireTime) {
        this.delete(key);
        window.localStorage.setItem(`Exp_${key}_${this.now + (expireTime * 60)}`, JSON.stringify(value));
    }

    get(key) {
        const expKey = this.getAllExpStorage();

        const findKey = _.filter(expKey, _key => key === this.keyName(_key));

        return JSON.parse(window.localStorage.getItem(findKey));
    }

    delete(key) {
        const expKey = this.getAllExpStorage();
        _.filter(expKey, _key => {
            if(this.keyName(_key) === key) {
                window.localStorage.removeItem(_key);
            }
        })
    }

    getAllExpStorage() {
        return _.reduce(_.keys(window.localStorage), (list, _key) => {
            if(_key.startsWith('Exp_')){
                list.push(_key);
                return list;
            }
            return list;
        }, []);
    }

    deleteExpiredStorage() {
        _.forEach(_.keys(window.localStorage), (_key) => {
            if(_key.startsWith('Exp_')){
                if(this.keyExpTime(_key) < this.now){
                    window.localStorage.removeItem(_key);
                }
            }
        });
    }

}

// Usage
const els = new ExpLocalStorage();
els.set('state', {version: '1.0.0'}, 10);
els.get('state');
els.delete('state');