05-get-redacted-data.js

/* UTILS */
const getFullName = (firstName, lastName, middleName) =>
  [firstName, middleName, lastName].filter((n) => !!n).join(" ");

const getFormattedBalance = (locale, currency, value) => {
  return new Intl.NumberFormat(locale, {
    style: "currency",
    currency
  }).format(value);
};

const getRedactedEmail = (email) => {
  const [name, ...rest] = email.split("@");
  const [service, domain] = rest.join("").split(".");

  const redactedName = `${name[0]}*****${name[name.length - 1]}`;
  const redactedDomain = `${service[0]}***${
    service[service.length - 1]
  }.${domain}`;

  return `${redactedName}@${redactedDomain}`;
};

const getRedactedName = (name) => (Boolean(name.length) ? `${name[0]}.` : "");

/* PROXY */


const handleRedactedGet = (obj, prop) => {
  if (prop === "fullName") {
    return getFullName(
      Reflect.get(obj, "firstName"),
      getRedactedName(Reflect.get(obj, "lastName")),
      getRedactedName(Reflect.get(obj, "middleName") || "")
    );
  }

  if (prop === "middleName") {
    return getRedactedName(Reflect.get(obj, "middleName"));
  }

  if (prop === "lastName") {
    return getRedactedName(Reflect.get(obj, "lastName"));
  }

  if (prop === "email") {
    return getRedactedEmail(Reflect.get(obj, "email"));
  }

  if (!(prop in obj)) {
    console.error(`${prop} doesn't exist in object`, obj);
    return;
  }

  return "Data not available";
};

const createRedactedDataProxy = (user) => {
  const proxy = new Proxy(user, {
    get: handleRedactedGet
  });

  return proxy;
};

/* USE */

const user = createRedactedDataProxy({
  firstName: "John",
  middleName: "",
  lastName: "Doe",
  email: "john.doe@email.com",
  balance: 2649.53,
  currency: "USD",
  locale: "en-US"
});

console.log(user.fullName); // John D.
console.log(user.email); // j*****e@e***l.com
console.log(user.balance); // 'Data not available'