index.js

const http = require("http");
const PORT = process.env.PORT || 5000;
const url = require("url");
const queryValid = require("./utils/checkQueryValidity");
const rateLimitCache = require("./utils/rateLimit")

const password = require("./utils/generate-password.js");

const cacheObj = new rateLimitCache()

const server = http.createServer((req, res) => {
  const queryObj = url.parse(req.url, true).query;
  const ip = req.socket.remoteAddress;
  const rateLimitExceeded = cacheObj.setCache(ip)

  if(rateLimitExceeded === false) {
      res.end("Too many requests, slow down. Max 20 allowed in 10 seconds")
  }else {

    const validQueries = {
        num: "boolean",
        caps: "boolean",
        char: "boolean",
        len: "number",
      };
    
      const validity = queryValid(queryObj, validQueries);
      const headers = {
        "Access-Control-Allow-Origin": "*",
        "Access-Control-Allow-Methods": "GET",
        "Content-Type": "application/json",
      };
    
      if(queryObj && queryObj.len && queryObj.num < 8){ 
        res.writeHead(400, headers);
        res.end(JSON.stringify({ data: `len can't be less than 8` }));
      }
      if (validity.state === false) {
        res.writeHead(400, headers);
        res.end(JSON.stringify({ data: `${validity.key} is not a valid query` }));
      } else {
        const data = password(
          queryObj.num,
          queryObj.char,
          queryObj.len,
          queryObj.caps
        );
        res.writeHead(200, headers);
        res.end(JSON.stringify({ data: data }));
      }

  }

  
});

server.listen(PORT, () => console.log("Server started on port " + PORT));