@e-group/utils/twIdValidator/twIdValidator.js

eGroup team utils that share across projects.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.isResidentPermitId = exports.isTwId = exports.isResidentPermitIdFormatValid = exports.isTwIdFormatValid = void 0;

const isTwIdFormatValid = id => /^[A-Z][1,2,8,9]\d{8}$/.test(id);

exports.isTwIdFormatValid = isTwIdFormatValid;

const isResidentPermitIdFormatValid = id => /^[A-Z][A,B,C,D]\d{8}$/.test(id);
/**
 * 把對應的英文字母轉換成二位數字
 */


exports.isResidentPermitIdFormatValid = isResidentPermitIdFormatValid;

const parseLetterToNumber = letter => {
  const letters = 'ABCDEFGHJKLMNPQRSTUVXYWZIO';
  return letters.indexOf(letter) + 10;
};
/**
 * 取得第一個字母的加權值
 */


const getFirstValue = letter => {
  // 第一碼英文字母轉換為二位數字碼
  const firstNumber = parseLetterToNumber(letter); // 轉換型態方便待會拆數字

  const firstNumberString = String(firstNumber); // 第一個字母的加權值

  return Number(firstNumberString.charAt(0)) * 1 + Number(firstNumberString.charAt(1)) * 9;
};
/**
 * 取得後面 8 碼(扣除驗證碼)的加權值
 */


const getSum = others => {
  let sum = 0; // 權重由 8 開始遞減至 1

  let weight = 8;

  for (let i = 0; i < others.length; i++) {
    const number = Number(others[i]);
    sum += number * weight;
    weight--;
  }

  return sum;
};
/**
 * 驗證檢查碼是否正確
 * 由模數減去餘數得檢查號碼，若餘數為 0 時，則設定其檢查碼為 0
 */


const checkNumberIsValid = (remainder, checkNumber) => {
  if (remainder === 0) {
    return checkNumber === 0;
  }

  return checkNumber === 10 - remainder;
};
/**
 * 身分證字號規則 http://web.fg.tp.edu.tw/~anny/idtest.htm
 */


const isTwId = id => {
  if (!isTwIdFormatValid(id)) return false;
  const firstValue = getFirstValue(id[0]);
  const idTailSum = getSum(Array.from(id.slice(1, 9)));
  const remainder = (firstValue + idTailSum) % 10;
  const checkNumber = Number(id.slice(-1));
  return checkNumberIsValid(remainder, checkNumber);
};
/**
 * 居留證號碼規則 http://web.fg.tp.edu.tw/~anny/idtest.htm
 */


exports.isTwId = isTwId;

const isResidentPermitId = id => {
  if (!isResidentPermitIdFormatValid(id)) return false;
  const firstValue = getFirstValue(id[0]);
  const secondNumberString = String(parseLetterToNumber(id[1]));
  const secondNumber = secondNumberString.charAt(1);
  const idTailSum = getSum([secondNumber, ...Array.from(id.slice(2, 9))]);
  const remainder = (firstValue + idTailSum) % 10;
  const checkNumber = Number(id.slice(-1));
  return checkNumberIsValid(remainder, checkNumber);
};

exports.isResidentPermitId = isResidentPermitId;