server.js

import express from 'express';
import bodyParser from 'body-parser';
import axios from 'axios';
import imageType from 'image-type';
import { filterImageFromURL, deleteLocalFiles } from './util/util.js';

// Init the Express application
const app = express();

// Set the network port
const port = process.env.PORT || 8082;

// Use the body parser middleware for post requests
app.use(bodyParser.json());

// @TODO1 IMPLEMENT A RESTFUL ENDPOINT
// GET /filteredimage?image_url={{URL}}
// endpoint to filter an image from a public url.
// IT SHOULD
//    1. validate the image_url query
//    2. call filterImageFromURL(image_url) to filter the image
//    3. send the resulting file in the response
//    4. deletes any files on the server on finish of the response
// QUERY PARAMETERS
//    image_url: URL of a publicly accessible image
// RETURNS
//   the filtered image file [!!TIP res.sendFile(filteredpath); might be useful]
app.get('/filteredimage', async (req, res) => {
  const { image_url } = req.query;

  if (!image_url) {
    return res.status(400).send('image_url query parameter is required.');
  }

  try {
    const response = await axios.get(image_url, { responseType: 'arraybuffer' });
    const imageBuffer = Buffer.from(response.data);

    const { ext, mime } = imageType(imageBuffer) || { ext: 'jpg', mime: 'image/jpeg' };

    res.set('Content-Type', mime);

    res.status(200).send(imageBuffer);
  } catch (error) {
    res.status(500).send(`An error occurred: ${error.message}`);
  }
});
//! END @TODO1

// Root Endpoint
// Displays a simple message to the user
app.get("/", async (req, res) => {
  res.send("try GET /filteredimage?image_url={{}}");
});

// Start the Server
app.listen(port, () => {
  console.log(`server running http://localhost:${port}`);
  console.log(`press CTRL+C to stop server`);
});