background.js

// var websites = {
//   "facebook.com" : [
//     [['2:00','8:00'], ['11:00','12:00']],
//     [['3:00','4:00'], ['11:00','12:00']],
//     ]
//   ,
//   "twitter.com" : [
//     [['2:00','4:00'], ['11:00','12:00']],
//     [['3:00','4:00'], ['11:00','12:00']]
//   ]
// };

var websites = {};
var websiteNames = [];
chrome.storage.sync.get("info",function(obj){
  if (obj.info)
    websites = obj.info;
  websiteNames = [...Object.getOwnPropertyNames(websites)].map((url) => {
          return urlMaker(url);
  });
			} );

let urlMaker = url => {return `*://*.${url}/*`};


var hostGetter = url => {
  let fullhost = new URL(url).origin;
  return fullhost.substring(fullhost.substring(0, fullhost.lastIndexOf('.')).lastIndexOf('.') + 1);
};

var info = JSON.parse(localStorage.getItem('info'));
chrome.webRequest.onBeforeRequest.addListener(
  (details) => {
        
        let date = new Date();
        if (websites[hostGetter(details.url)] === undefined) return;
        for(let val of websites[hostGetter(details.url)][date.getDay()]){
          let startTime = parseInt(val[0].split(':').join(''));
          let endTime = parseInt(val[1].split(':').join(''));
          let actualTime = parseInt(date.toTimeString().split(" ")[0].split(":")[0] + date.toTimeString().split(" ")[0].split(":")[1]);
          if ((actualTime >= startTime) && (actualTime < endTime)){
            chrome.tabs.update( {url : "blocked.html"});
            return {
              cancel : true
            };
          }
        }

        return {
        };
  },
  {urls: websiteNames},
  ["blocking"]
  );