add webhook example for Twisted framework

examples/webhook_examples/webhook_twisted_echo_bot.py

@@ -0,0 +1,73 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+import logging
+import telebot
+import json
+from twisted.internet import ssl, reactor
+from twisted.web.resource import Resource, ErrorPage
+from twisted.web.server import Site, Request
+
+API_TOKEN = '<api_token>'
+
+WEBHOOK_HOST = '<ip or hostname>'
+WEBHOOK_PORT = 8443  # 443, 80, 88 or 8443 (port need to be 'open')
+WEBHOOK_LISTEN = '0.0.0.0'  # In some VPS you may need to put here the IP addr
+
+WEBHOOK_SSL_CERT = './webhook_cert.pem'  # Path to the ssl certificate
+WEBHOOK_SSL_PRIV = './webhook_pkey.pem'  # Path to the ssl private key
+
+# Quick'n'dirty SSL certificate generation:
+#
+# openssl genrsa -out webhook_pkey.pem 2048
+# openssl req -new -x509 -days 3650 -key webhook_pkey.pem -out webhook_cert.pem
+#
+# When asked for "Common Name (e.g. server FQDN or YOUR name)" you should reply
+# with the same value in you put in WEBHOOK_HOST
+
+WEBHOOK_URL_BASE = "https://{}:{}".format(WEBHOOK_HOST, WEBHOOK_PORT)
+WEBHOOK_URL_PATH = "/{}/".format(API_TOKEN)
+
+logger = telebot.logger
+telebot.logger.setLevel(logging.INFO)
+bot = telebot.TeleBot(API_TOKEN)
+
+
+# Handle '/start' and '/help'
+@bot.message_handler(commands=['help', 'start'])
+def send_welcome(message):
+    bot.reply_to(message,
+                 ("Hi there, I am EchoBot.\n"
+                  "I am here to echo your kind words back to you."))
+
+
+# Handle all other messages
+@bot.message_handler(func=lambda message: True, content_types=['text'])
+def echo_message(message):
+    bot.reply_to(message, message.text)
+
+
+# Remove webhook, it fails sometimes the set if there is a previous webhook
+bot.remove_webhook()
+
+# Set webhook
+bot.set_webhook(url=WEBHOOK_URL_BASE + WEBHOOK_URL_PATH,
+                certificate=open(WEBHOOK_SSL_CERT, 'r'))
+
+
+# Process webhook calls
+class WebhookHandler(Resource):
+    isLeaf = True
+    def render_POST(self, request: Request):
+        request_body_dict = json.load(request.content)
+        update = telebot.types.Update.de_json(request_body_dict)
+        reactor.callInThread(lambda: bot.process_new_updates([update]))
+        return b''
+
+
+root = ErrorPage(403, 'Forbidden', '')
+root.putChild(API_TOKEN.encode(), WebhookHandler())
+site = Site(root)
+sslcontext = ssl.DefaultOpenSSLContextFactory(WEBHOOK_SSL_PRIV, WEBHOOK_SSL_CERT)
+reactor.listenSSL(8443, site, sslcontext)
+reactor.run()