Cloudflare Proxy Worker.js

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

function slugify(input) {
  if (!input)
      return '';

  // make lower case and trim
  var slug = input.toLowerCase().trim();

  // remove accents from charaters
  slug = slug.normalize('NFD').replace(/[\u0300-\u036f]/g, '')

  // replace invalid chars with spaces
  slug = slug.replace(/[^a-z0-9\s-]/g, ' ').trim();

  // replace multiple spaces or hyphens with a single hyphen
  slug = slug.replace(/[\s-]+/g, '_');

  return slug;
}

async function handleRequest(request) {
  const root_url = new URL(request.url);

  // Extract the query parameters
  const url = decodeURIComponent(root_url.searchParams.get("url"));
  const mediaType = url.includes("mime=video") ? "mp4": "mp3";
  console.log(url?.includes("mime=video"), mediaType)
  const filename = slugify(root_url.searchParams.get("filename"));

  if (!url) {
    return new Response('URL parameter is required', { status: 400 });
  }

  if (!mediaType) {
    return new Response('Media type parameter is required', { status: 400 });
  }

  if (!filename) {
    return new Response('Filename parameter is required', { status: 400 });
  }

  if (mediaType !== 'mp3' && mediaType !== 'mp4') {
    return new Response('Invalid media type', { status: 400 });
  }

  try {
    const response = await fetch(url, {
      method: request.method,
      headers: request.headers,
    });

    if (!response.ok) {
      throw new Error('Failed to fetch');
    }

    // Set appropriate headers
    const responseHeaders = new Headers(response.headers);
    responseHeaders.set('Content-Type', mediaType === 'mp3' ? 'audio/mpeg' : 'video/mp4');
    responseHeaders.set('Content-Disposition', `attachment; filename*=UTF-8''${encodeURIComponent(filename)}.${mediaType}`);
    responseHeaders.set('Access-Control-Allow-Origin', '*');
    responseHeaders.set('Access-Control-Allow-Methods', 'GET, OPTIONS');
    responseHeaders.set('Access-Control-Allow-Headers', 'Content-Type');

    return new Response(response.body, {
      status: response.status,
      statusText: response.statusText,
      headers: responseHeaders,
    });
  } catch (error) {
    console.error(error);
    return new Response('Error proxying the request', { status: 500 });
  }
}