ussd-tg-proxy/src/util.js

// this regex extracts ussd reply options
const regex = /\s(\d{1,2})\.\s/g;

// TODO: converts the text to a telegram keyboard
function createKeyboard(input) {
  return Array.from(input.matchAll(regex), (m) => [m[1]]);
}

// parses ussd responses to code and text
function parseUssdResponse(input) {
  return {
    code: input.slice(0, 3),
    text: input.slice(4),
    keyboard: createKeyboard(input),
  };
}

function isKenyanNumber(input) {
  if (input.substr(0, 1) === "+") {
    input = input.split("+")[1];
  }

  if (input.substr(0, 3) === "254") {
    return true;
  }

  return false;
}

module.exports = {
  createKeyboard,
  parseUssdResponse,
  isKenyanNumber,
};