index.js

const axios = require("axios");
const jsdom = require("jsdom");
const express = require("express"); 
const cors = require("cors");
const { JSDOM } = jsdom;

const app = express();

app.use(cors());
app.set("view engine", "ejs");
app.set("views", __dirname + "/views");
app.use(express.static(__dirname + "/static"));
app.get("/heatmap/:handle", (req, res) => {
  let theme = req.query.theme == "night" ? "night" : "day";
  res.render("heatmap", { handle: req.params.handle, theme });
});
app.get("/rating/:handle", (req, res) => {
  res.render("rating", { handle: req.params.handle });
});


const fecher =async (handle)=>{
  try{
    const resdata = await fetch(
      `https://www.codechef.com/users/${handle}`
    ); 
    if (resdata.status == 200) {

      let d = await resdata.text(); 
      let data = { data: d };
      let heatMapDataCursour1 =
      data.data.search("var userDailySubmissionsStats =") +
      "var userDailySubmissionsStats =".length;
      let heatMapDataCursour2 = data.data.search("'#js-heatmap") - 34;
      let heatDataString = data.data.substring(
        heatMapDataCursour1,
        heatMapDataCursour2
      );
      // console.log(heatDataString)
      let headMapData = JSON.parse(heatDataString);
      let allRating =
        data.data.search("var all_rating = ") + "var all_rating = ".length;
      let allRating2 = data.data.search("var current_user_rating =") - 6;
      let ratingData = JSON.parse(data.data.substring(allRating, allRating2));
      let dom = new JSDOM(data.data);
      let document = dom.window.document;
      return {
        success: true,
        status:resdata.status,
        profile: document.querySelector(".user-details-container").children[0]
          .children[0].src,
        name: document.querySelector(".user-details-container").children[0]
          .children[1].textContent,
        currentRating: parseInt(
          document.querySelector(".rating-number")?.textContent
        ),
        highestRating: parseInt(
          document
            .querySelector(".rating-number")?.parentNode?.children[4]?.textContent?.split("Rating")[1]
        ),
        countryFlag: document.querySelector(".user-country-flag").src,
        countryName: document.querySelector(".user-country-name").textContent,
        globalRank: parseInt(
          document.querySelector(".rating-ranks")?.children[0]?.children[0]
            ?.children[0]?.children[0]?.innerHTML
        ),
        countryRank: parseInt(
          document.querySelector(".rating-ranks")?.children[0]?.children[1]
            ?.children[0]?.children[0]?.innerHTML
        ),
        stars: document.querySelector(".rating")?.textContent || "unrated",
        heatMap: headMapData,
        ratingData,
      };
    }
    else{
      return {success:false,status:resdata.status}
    }
  }catch(e){
    console.log(e)
    return {success:false,status:404}
  }
}

app.get("/handle/:handle", async (req, res) => {
  try {
    if (req.params.handle === "favicon.ico")
      res.send({ success: false, error: 'invalid handle' });
    let handle = req.params.handle;
      let resd = await fecher(handle);
      while(resd.status==429){
        for(let i=0;i<1000000;i++){}
        resd = await fecher(handle);
      }
      res.send(resd)
    }catch (err) { 
    res.send({ success: false, error: err });
  }
});

app.get("/", (req, res) => {
  res.render("home");
  // res.status(200).send("Hi you are at right endpoint just add /handle_of_user at the end of url Github-repo(https://github.com/deepaksuthar40128/Codechef-API) Thanks for 🌟");
});

app.get("/:handle", (req, res) => {
  const handle = req.params.handle;
  if (handle && handle.length && !handle.includes("."))
    res.redirect(`/handle/${handle}`);
  else
    res.send({
      success: false,
      error: `Invalid Endpoint kindly change your url from https://codechef-api.vercel.app/${handle} to https://codechef-api.vercel/handle/${handle} or may be incorrect handle`,
    });
});

const PORT = process.env.PORT || 8800;
app.listen(PORT, () => {
  console.log(`Server is running on port ${PORT}`);
});