API for UK food product photos (via Cloudflare Workers)

uk-food-images.js

/**
 * Cloudflare Worker script for displaying UK food products
 * Fetches given item from Tesco.com using search endpoint
 * Optionally resizes to specified dimensions
 * Implements caches recently requested images
 * Swaers a little bit when an error happens
 */

addEventListener('fetch', event => {
  event.respondWith(handleRequest(event.request, event))
})

const USER_AGENT = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.102 Safari/537.36';
const TESCO_SEARCH_URL = 'https://www.tesco.com/groceries/en-GB/search?query=';
const WELCOME = 'Welcome to the Snack Champion\'s product photo API! 🥤🍬🍿😋\n' +
'To use this service, please specify a product name and optional dimensions.';

async function handleRequest(request, event) {
  const cacheUrl = new URL(request.url);
  const cacheKey = new Request(cacheUrl.toString(), request);
  const cache = caches.default;

  // Check if the response is already in the cache
  let response = await cache.match(cacheKey);
  if (response) {
    return response; // Return the cached response if it exists
  }

  try {
    const { productName, dimension } = extractProductAndDimension(request.url);

    if (!productName) {
      return new Response(WELCOME, { status: 418 });
    }

    const imageURL = await fetchProductImageURL(productName, dimension);

    if (imageURL) {
      response = await fetchAndReturnImage(imageURL);
      // Store the fetched response in the cache.
      event.waitUntil(cache.put(cacheKey, response.clone()));
      return response;
    } else {
      return new Response("Image not found. Fuck sake", { status: 404 });
    }
  } catch (error) {
    console.error(error); // Log the error for debugging
    return new Response("An error occurred. Shit", { status: 500 });
  }
}

function extractProductAndDimension(url) {
  const pathSegments = new URL(url).pathname.split("/").filter(Boolean);
  return {
    productName: pathSegments[0],
    dimension: pathSegments[1] // undefined if not present
  };
}

async function fetchProductImageURL(product, dimension) {
  const response = await fetch(`${TESCO_SEARCH_URL}${product}`, { headers: { 'User-Agent': USER_AGENT } });
  const body = await response.text();
  const match = body.match(/(https:\/\/digitalcontent\.api\.tesco\.com\/v2\/media\/[^?]+)/);
  if (match) {
    let imageURL = match[0];
    if (dimension) {
      imageURL += `?h=${dimension}&w=${dimension}`;
    }
    return imageURL;
  } else {
    return null;
  }
}

async function fetchAndReturnImage(imageURL) {
  const response = await fetch(imageURL);
  const imageBlob = await response.blob();
  return new Response(imageBlob, {
    headers: { 'Content-Type': response.headers.get('Content-Type') }
  });
}

I made this in order to get product photos for github.com/lissy93/cso.
Here's a screenshot