A reverse proxy for Telegram Bot API on Aliyun Function Compute / Cloudflare Workers

README.MD

A reverse proxy for Telegram Bot API on Aliyun Function Compute / Cloudflare Workers

To help users in China mainland access telegram api stably and conveniently with low cost, this script maybe the one you need.

The server-less means you don't have to run a server to proxy the requests, just pay as you go.

Usage

Edit key_prefix, set it to the prefix of you bot address(like /bot563441998:) can avoid abusing.

Tip: You should create the function in regions outside China mainland.

If you use Aliyun FC, create a function with Flask template and replace it with the flask.py. If you use Cloudflare Workers, use the cf.js.

cf.js

const whitelist = ["/bot563441998:"];
const tg_host = "api.telegram.org";

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

function validate(path) {
    for (var i = 0; i < whitelist.length; i++) {
        if (path.startsWith(whitelist[i]))
            return true; 
    }
    return false;
}

async function handleRequest(request) {
    var u = new URL(request.url);
    u.host = tg_host;
    if (!validate(u.pathname))
        return new Response('Unauthorized', {
            status: 403
        });
    var req = new Request(u, {
        method: request.method,
        headers: request.headers,
        body: request.body
    });
    const result = await fetch(req);
    return result;
}

flask.py

#!/usr/bin/env python
# coding=utf-8
from flask import Flask
from flask import request
from flask import make_response
import requests

try:
  from urllib.parse import urlparse
except:
  from urlparse import urlparse

app = Flask(__name__)

base_path = ''
key_prefix = "/bot"
telegram_api = "https://api.telegram.org"

@app.route('/', defaults={'path': ''}, methods=['GET', 'POST'])
@app.route('/<path:path>', methods=['GET', 'POST'])
def home(path):
    if not request.full_path.startswith(key_prefix):
        return make_response("401 Unauthorized.", 401)
    method = request.method
    full_path = request.full_path
    url = telegram_api + full_path
    data = None if method.upper() == "GET" else request.form.to_dict()
    req = requests.request(method, url, data=data)
    return make_response(req.content, req.status_code)


def handler(environ, start_response):
    parsed_tuple = urlparse(environ['fc.request_uri'])
    li = parsed_tuple.path.split('/')
    global base_path
    if not base_path:
        base_path = "/".join(li[0:5])
    return app(environ, start_response)

test.py

import requests

TG_TOKEN = ""
#TG_URL = "https://api.telegram.org/bot%s/sendMessage" % TG_TOKEN
TG_URL = " https://xxxxxx.cn-hongkong.fc.aliyuncs.com/xxxxx/proxy/xxxx/xxxx/bot%s/sendMessage" % TG_TOKEN
CHAT_ID = 0

data = {"chat_id":CHAT_ID, "text":"TEST"}
print(requests.post(TG_URL,data).content)

test.sh

curl -X POST \
       -H 'Content-Type: application/json' \
       -d '{"chat_id": "0000000", "text": "This is a test from curl"}' \
       https://xxx.xxxx.workers.dev/bot233333:AAAAAAAAAAAAAAAAAAA/sendMessage