index.js

/**
 *  Telegram API Forwarder for Cloudflare Workers
 *  @author Max Base
 *  @version 1.0
 */
addEventListener('fetch', event => {
  event.respondWith(handleRequest(event.request));
});

/**
 * Handles incoming requests, forwards them to the Telegram API,
 * and returns the API's response.
 *
 * @param {Request} request - The incoming fetch request.
 * @returns {Promise<Response>} The response from the Telegram API, or an error response.
 */
async function handleRequest(request) {
  try {
    const url = new URL(request.url);

    url.hostname = 'api.telegram.org';

    const newRequest = new Request(url.toString(), {
      method: request.method,
      headers: request.headers,
      body: request.body,
      redirect: 'follow'
    });

    const response = await fetch(newRequest);
    return response;
  } catch (error) {
    console.error('Error forwarding request:', error);
    return new Response('Telegram API Forwarder Error', {
      status: 500,
      headers: {
        'content-type': 'text/plain; charset=utf-8',
      },
    });
  }
}