Function to handle MAL API Authentication in Express

mal-auth-handler.js

const puppeteer = require("puppeteer");
const crypto =  require("crypto");
const querystring = require("querystring");
const axios = require("axios").default;
require("dotenv").config();

static async login(req, res) {
  try {
    const code_challenge = crypto.randomBytes(64).toString("hex");
    const code_verifier = code_challenge;

    const browser =  await puppeteer.launch({
      headless: true,
    });

    const page = await browser.newPage();
    page.setViewport({
      width: 1366,
      height: 768
    });

    const url = `https://myanimelist.net/v1/oauth2/authorize?response_type=code&client_id=${process.env.CLIENT_ID}&code_challenge=${code_challenge}&state=RequestID42`;

    await page.setUserAgent("Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.75 Safari/537.36");
    await page.goto(url, {
      waitUntil: 'domcontentloaded'
    });
    await page.waitForTimeout(1000);
    await page.click("#loginUserName");
    await page.keyboard.type(process.env.MAL_USERNAME);
    await page.click("#login-password");
    await page.keyboard.type(process.env.MAL_PASSWORD);
    await page.click("#content > div > section.sec-local-login > form > div > p:nth-child(7) > input")
    await page.waitForTimeout(1000);
    await page.goto(url, {
      waitUntil: 'domcontentloaded'
    });
    await page.waitForSelector("#content > div > div > div > form > input.submit-block__button.button.button--primary.btn-recaptcha-submit", {
      timeout: 100000
    });
    await page.click("#content > div > div > div > form > input.submit-block__button.button.button--primary.btn-recaptcha-submit");
    await page.waitForTimeout(1000);
    await page.waitForNavigation();

    const url_code = page.url().replace("https://twitter.com/_NandaPurba_?", "").replace("&state=RequestID42", "").replace("code=", "");

    await page.close();
    await browser.close();

    const config = {
      headers: {
        'Content-Type': 'application/x-www-form-urlencoded'
      }
    };

    const auth = await axios.post('https://myanimelist.net/v1/oauth2/token', querystring.stringify({
      'client_id': process.env.CLIENT_ID,
      'client_secret': process.env.CLIENT_SECRET,
      'code': url_code,
      'code_verifier': code_verifier,
      'grant_type': 'authorization_code'
    }), config);

    return res.status(200).json({
      status: "200",
      message: "Success",
      data: auth.data
    });
  } catch (error) {
    return res.status(500).json({
      status: "500",
      message: error.message,
      data: error
    }));
  }
}