fraud-check/app.js

Fraud Checker

const axios = require("axios");

const getIpInfo = async (ip, custom) => {
  let link =
    custom && custom.link && custom.key
      ? custom.link
      : "http://ip-api.com/json/";
  return (
    await axios.get(link.replace(/\/?$/, "/") + ip, {
      params: {
        fields: "status,countryCode,proxy,hosting",
        key: custom ? custom.key : custom,
      },
    })
  ).data;
};

const validateIp = (ip) => {
  return /((^\s*((([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5]))\s*$)|(^\s*((([0-9A-Fa-f]{1,4}:){7}([0-9A-Fa-f]{1,4}|:))|(([0-9A-Fa-f]{1,4}:){6}(:[0-9A-Fa-f]{1,4}|((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){5}(((:[0-9A-Fa-f]{1,4}){1,2})|:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){4}(((:[0-9A-Fa-f]{1,4}){1,3})|((:[0-9A-Fa-f]{1,4})?:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){3}(((:[0-9A-Fa-f]{1,4}){1,4})|((:[0-9A-Fa-f]{1,4}){0,2}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){2}(((:[0-9A-Fa-f]{1,4}){1,5})|((:[0-9A-Fa-f]{1,4}){0,3}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){1}(((:[0-9A-Fa-f]{1,4}){1,6})|((:[0-9A-Fa-f]{1,4}){0,4}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(:(((:[0-9A-Fa-f]{1,4}){1,7})|((:[0-9A-Fa-f]{1,4}){0,5}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:)))(%.+)?\s*$))/.test(
    ip
  );
};

exports.verify = async ({ ip, countryArr, custom }) => {
  if (validateIp(ip)) {
    const { status, countryCode, proxy, hosting } = await getIpInfo(ip, custom);
    if (status === "fail") return true;
    return !(
      proxy ||
      hosting ||
      (Array.isArray(countryArr) ? countryArr.includes(countryCode) : false)
    );
  }
  return false;
};

exports.accept = async ({ ip, countryArr, custom }) => {
  if (validateIp(ip)) {
    const { status, countryCode, proxy, hosting } = await getIpInfo(ip, custom);
    if (status === "fail") return true;
    return !(
      proxy ||
      hosting ||
      (Array.isArray(countryArr) ? !countryArr.includes(countryCode) : false)
    );
  }
  return false;
};

exports.verifyWithReason = async ({ ip, countryArr, custom }) => {
  if (validateIp(ip)) {
    const { status, countryCode, proxy, hosting } = await getIpInfo(ip, custom);
    if (status === "fail")
      return {
        valid: true,
        proxy,
        hosting,
      };
    return {
      valid: !(
        proxy ||
        hosting ||
        (Array.isArray(countryArr) ? countryArr.includes(countryCode) : false)
      ),
      proxy,
      hosting,
      country: Array.isArray(countryArr)
        ? countryArr.includes(countryCode)
        : false,
    };
  }
  return {
    valid: false,
    proxy: false,
    hosting: false,
  };
};

exports.acceptWithReason = async ({ ip, countryArr, custom }) => {
  if (validateIp(ip)) {
    const { status, countryCode, proxy, hosting } = await getIpInfo(ip, custom);
    if (status === "fail")
      return {
        valid: true,
        proxy,
        hosting,
      };
    return {
      valid: !(
        proxy ||
        hosting ||
        (Array.isArray(countryArr) ? !countryArr.includes(countryCode) : false)
      ),
      proxy,
      hosting,
      country: Array.isArray(countryArr)
        ? !countryArr.includes(countryCode)
        : false,
    };
  }
  return {
    valid: false,
    proxy: false,
    hosting: false,
  };
};