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// Cloudflare Worker script to proxy Telegram API requests
// This script intercepts requests to the Telegram Bot API and forwards them
// allowing your bot to work even when direct access to api.telegram.org is blocked
export default {
async fetch(request, env, ctx) {
// Get the original request URL
const originalUrl = new URL(request.url);
// Handle CORS preflight requests
if (request.method === 'OPTIONS') {
return new Response(null, {
headers: {
'Access-Control-Allow-Origin': '*',
'Access-Control-Allow-Methods': 'GET, POST, PUT, DELETE, OPTIONS',
'Access-Control-Allow-Headers': 'Content-Type, Authorization',
},
});
}
// Check if this is a request to our worker
// If the path starts with /telegram-api, forward to Telegram API
if (originalUrl.pathname.startsWith('/telegram-api')) {
// Extract the path after /telegram-api
// The full path should be like /telegram-api/bot{TOKEN}/{METHOD}
const telegramApiPath = originalUrl.pathname.replace('/telegram-api', '');
// Construct the target URL for Telegram API
const telegramApiUrl = `https://api.telegram.org${telegramApiPath}`;
// Clone the original request to modify it
// Remove the Cloudflare-specific headers that might cause issues
const newHeaders = new Headers(request.headers);
newHeaders.delete('cf-ray');
newHeaders.delete('cf-connecting-ip');
newHeaders.delete('x-forwarded-for');
const modifiedRequest = new Request(telegramApiUrl, {
method: request.method,
headers: newHeaders,
body: request.body,
redirect: 'follow'
});
try {
// Send request to Telegram API
const response = await fetch(modifiedRequest);
// Return the response from Telegram API with CORS headers
const modifiedResponse = new Response(response.body, {
status: response.status,
statusText: response.statusText,
headers: {
...response.headers,
'Access-Control-Allow-Origin': '*',
'Access-Control-Allow-Methods': 'GET, POST, PUT, DELETE, OPTIONS',
'Access-Control-Allow-Headers': 'Content-Type, Authorization',
}
});
return modifiedResponse;
} catch (error) {
console.error('Proxy error:', error);
return new Response(JSON.stringify({
error: 'Proxy error',
details: error.message,
message: 'Failed to connect to Telegram API'
}), {
status: 502, // Bad Gateway
headers: {
'Content-Type': 'application/json',
'Access-Control-Allow-Origin': '*',
}
});
}
}
// If not a Telegram API request, return info about the proxy
return new Response('Telegram API Proxy Worker - Ready to forward requests to Telegram API', {
status: 200,
headers: {
'Content-Type': 'text/plain',
'Access-Control-Allow-Origin': '*',
}
});
}
}; |