stdnum/src/th/moa.ts

Standard Number Validation

/**
 * MOA (Thailand Memorandum of Association Number).
 *
 * Memorandum of Association Number (aka Company's Taxpayer Identification
 * Number) are numbers issued by the Department of Business Development.
 * The number consists of 13 digits of which the last is a check digit following
 * the same algorithm as in the Personal Identity Number (PIN). It uses a
 * different grouping format and always starts with zero to indicate that the
 * number issued by DBD.
 *
 * Source
 *   https://www.dbd.go.th/download/pdf_kc/s09/busin_2542-48.pdf
 *
 * ENTITY
 */

import * as exceptions from '../exceptions';
import { strings } from '../util';
import { Validator, ValidateReturn } from '../types';
import { weightedSum } from '../util/checksum';

function clean(input: string): ReturnType<typeof strings.cleanUnicode> {
  return strings.cleanUnicode(input, ' -');
}

const impl: Validator = {
  name: 'Thailand Memorandum of Association Number',
  localName: '',
  abbreviation: 'MOA',
  compact(input: string): string {
    const [value, err] = clean(input);

    if (err) {
      throw err;
    }

    return value;
  },

  format(input: string): string {
    const [value] = clean(input);

    return strings.splitAt(value, 1, 3, 4, 7, 12).join('-');
  },

  validate(input: string): ValidateReturn {
    const [value, error] = clean(input);

    if (error) {
      return { isValid: false, error };
    }
    if (value.length !== 13) {
      return { isValid: false, error: new exceptions.InvalidLength() };
    }
    if (!strings.isdigits(value)) {
      return { isValid: false, error: new exceptions.InvalidFormat() };
    }

    if (value[0] !== '0') {
      return { isValid: false, error: new exceptions.InvalidComponent() };
    }

    const [front, check] = strings.splitAt(value, 12);

    // same sum as IDNR
    const sum = weightedSum(front, {
      weights: [13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1],
      modulus: 11,
    });

    if (String((11 - sum) % 10) !== check) {
      return { isValid: false, error: new exceptions.InvalidChecksum() };
    }

    return {
      isValid: true,
      compact: value,
      isIndividual: false,
      isCompany: true,
    };
  },
};

export const { name, localName, abbreviation, validate, format, compact } =
  impl;