function myFunction() {
  var user_name = "aki";
  var pass = "1234567";
  var data = {data: "dummy"};
  var score = Math.random();
  main("Log", user_name, pass, data, score);
}

function hash(key, value) {
  return Utilities.base64Encode(Utilities.computeHmacSha256Signature(value, key));
}
function main(table, user_name, pass, data, score){
  pass = hash(user_name, pass);
  var sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Users");
  var uid = findOrCreate(user_name, pass);
  if(uid == -1){
    return false;
  }
  addRecord("Log", uid, {h: 2}, 0.5);
}

function addRecord(table, uid, obj, score) {
  var sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(table);
  sheet.getRange(102, 1, 1, 3).setValues([[uid, obj, score]]);
  sheet.sort(3);
}

function findOrCreate(user_name, pass) {
  var uid = find(user_name, pass);
  if(uid > 0){
    return uid;
  }
  if(uid != -1){
     return uid;
  }
  SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Users").appendRow([user_name, pass, new Date(), new Date()]);
  return find(user_name, pass);
}

function find(user_name, pass) {
  var sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Users");
  var userCount = sheet.getLastRow();
  var data = sheet.getRange(1, 1, userCount, 2).getValues();
  for(var i = 0; i < userCount; i++) {
    if(data[i]==null) continue;
    if(data[i][0] == user_name) {
      if(data[i][1] == pass) {
        return i;
      }else{
        // invalid password
        return -2;
      }
    }
  }

  return -1;
}

function doGet(e)
{
  var user_name = e.parameter["name"];
  var pass = e.parameter["pass"];
  var data = e.parameter["data"];
  var score = e.parameter["score"];
  var table = e.parameter["table"];
  if(data == undefined){
    var result = main(table, user_name, pass, data, score);
  }

  var d = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(table).getRange(1, 1, 100, 3).getValues();
  return ContentService.createTextOutput(JSON.stringify(d));
}