From aeca3ca174292ef3c477352ba6e7eb906855e1b7 Mon Sep 17 00:00:00 2001
From: Noam Meltzer <tsnoam@gmail.com>
Date: Sat, 26 Dec 2015 01:10:15 +0200
Subject: [PATCH] basic token validation

refs #134
---
 telegram/bot.py | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/telegram/bot.py b/telegram/bot.py
index eee2c41c9..fe6023b1f 100644
--- a/telegram/bot.py
+++ b/telegram/bot.py
@@ -52,7 +52,7 @@ class Bot(TelegramObject):
     def __init__(self,
                  token,
                  base_url=None):
-        self.token = token
+        self.token = self._valid_token(token)
 
         if base_url is None:
             self.base_url = 'https://api.telegram.org/bot%s' % self.token
@@ -744,3 +744,11 @@ class Bot(TelegramObject):
     def __reduce__(self):
         return (self.__class__, (self.token,
                                  self.base_url.replace(self.token, '')))
+
+    @staticmethod
+    def _valid_token(token):
+        """a very basic validation on token"""
+        left, sep, _right = token.partition(':')
+        if (sep is None) or (not left.isdigit()) or (len(left) < 3):
+            raise TelegramError('Invalid token')
+        return token