added whitelist check

bot.py

@@ -5,7 +5,7 @@ from telegram.ext import Application, CommandHandler, ContextTypes, MessageHandl
 
 
 class Butler(object):
-    def __init__(self, logger, token, whitelist):
+    def __init__(self, logger, token, whitelist=[]):
         self.logger = logger
         self.token = token
         self.whitelist = whitelist
@@ -15,10 +15,10 @@ class Butler(object):
 
         # on different commands - answer in Telegram
         application.add_handler(CommandHandler("start", Butler.start))
-        application.add_handler(CommandHandler("help", Butler.help_command))
+        application.add_handler(CommandHandler("help", self.help_command))
         application.add_handler(CommandHandler("stop", self.stop))
-        application.add_handler(CommandHandler("echo", Butler.echo))
-        application.add_handler(CommandHandler("who", Butler.who))
+        application.add_handler(CommandHandler("echo", self.echo))
+        application.add_handler(CommandHandler("who", self.who))
 
         # on non command i.e message - echo the message on Telegram
         # application.add_handler(MessageHandler(filters.TEXT & ~filters.COMMAND, self.echo))
@@ -37,17 +37,37 @@ class Butler(object):
 /who - Información sobre ti y tu mensaje (para debugging).
 """
 
+    def valid_ids(self, update: Update):
+        user = update.effective_user
+        chat = update.effective_chat
+        chat_name = chat.effective_name
+        ids = [user.id, chat.id]
+
+        if not self.whitelist:
+            return True
+        for id in ids:
+            if id in self.whitelist:
+                return True
+
+        self.logger.warning("User {} [{}] or chat {} [{}] are not in the whitelist."
+                            .format(user.username, user.id, chat_name, chat.id))
+        return False
+
     async def start(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
         """Send a message when the command /start is issued."""
         user = update.effective_user
         await update.message.reply_html(rf"Hi {user.mention_html()}!")
 
-    async def help_command(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
+    async def help_command(self, update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
         """Send a message when the command /help is issued."""
+        if not self.valid_ids(update):
+            return
         await update.message.reply_text(Butler.help_msg())
 
-    async def echo(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
+    async def echo(self, update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
         """Echo the user message."""
+        if not self.valid_ids(update):
+            return
         echo_text = update.message.text.split(maxsplit=1)
         await update.message.reply_text(echo_text[1])
 
@@ -55,7 +75,10 @@ class Butler(object):
         user = update.effective_user
         self.logger.warning("I got blocked by user {} [{}]".format(user.username, user.id))
 
-    async def who(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
+    async def who(self, update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
+        if not self.valid_ids(update):
+            return
+
         mssg = update.message
         user = update.effective_user
         chat = update.effective_chat
@@ -74,5 +97,8 @@ class Butler(object):
     def run(self) -> None:
         """Start the bot."""
 
+        if self.whitelist:
+            self.logger.info("Current whitelist: {}".format(self.whitelist))
+
         # Run the bot until the user presses Ctrl-C
         self.application.run_polling(allowed_updates=Update.ALL_TYPES)