server.js

const express = require('express');
const http = require('http');
const proxy = require('express-http-proxy');
const socketIo = require('socket.io');
const moment = require('moment-timezone');

const app = express();
const server = http.createServer(app);
const io = socketIo(server);

const targetUrl = 'https://api.openai.com';
const openaiKey = process.env.OPENAI_KEY;
const port = 7860;
const baseUrl = getExternalUrl(process.env.SPACE_ID);

let requestDetails = []; // Store details of each request
let ipRequestCounts = {}; // Dictionary to keep track of requests per IP

io.on('connection', (socket) => {
    console.log('A user connected to the websocket for live logs.');
});

function logAndEmit(message) {
    console.log(message);  // Continue to log to the console
    io.emit('log', message);  // Emit this log to the frontend via WebSocket
}

app.use('/api', (req, res, next) => {
  if (req.method === 'POST' && req.url.startsWith('/v1/chat/completions')) {
    const ip = req.headers['x-forwarded-for'] || req.connection.remoteAddress;
    ipRequestCounts[ip] = (ipRequestCounts[ip] || 0) + 1;

    if (ipRequestCounts[ip] > 20 ) {
      const rateLimitMessage = `IP ${ip} hit rate limit with ${ipRequestCounts[ip]} requests.`;
      logAndEmit(rateLimitMessage);
      return res.status(429).send('You have reached the 10 message limit. Please contact support for more information.');
    }
    
    const logMessage = `IP ${ip} has made ${ipRequestCounts[ip]} requests so far.`;
    logAndEmit(logMessage);
  }

  const timestamp = moment().tz("Asia/Tbilisi").format();
  const requestData = {
    requestNumber: ipRequestCounts[req.headers['x-forwarded-for'] || req.connection.remoteAddress],
    ip: req.headers['x-forwarded-for'] || req.connection.remoteAddress,
    timestamp: timestamp,
    text: req.method + ' ' + req.url
  };
  requestDetails.push(requestData);
  
  const detailedLog = `Request ${requestData.requestNumber} on ${requestData.timestamp} from IP ${requestData.ip} with method "${req.method}" and text "${requestData.text}"`;
  logAndEmit(detailedLog);

  next();
}, proxy(targetUrl, {
  proxyReqOptDecorator: function(proxyReqOpts, srcReq) {
    proxyReqOpts.headers['Authorization'] = 'Bearer ' + openaiKey;
    return proxyReqOpts;
  }
}));

app.get("/", (req, res) => {
  let requestsInfo = requestDetails.map(detail =>
    `Request ${detail.requestNumber} on ${detail.timestamp} from IP ${detail.ip} with text "${detail.text}"`).join('<br>');
  res.send(`This is your OpenAI Reverse Proxy URL: ${baseUrl}.<br><br>Requests Overview:<br>${requestsInfo}`);
});

app.get('/logs', (req, res) => {
    res.sendFile(__dirname + '/index.html');
});

function getExternalUrl(spaceId) {
  try {
    const [username, spacename] = spaceId.split("/");
    return `https://${username}-${spacename.replace(/_/g, "-")}.hf.space/api/v1`;
  } catch (e) {
    return "Error generating external URL";
  }
}

server.listen(port, () => {
   logAndEmit(`Reverse proxy server and WebSocket running on port ${port}`);
});