Add core function for checking nick validity

Author: linuxdaemon

cloudbot/client.py

@@ -122,6 +122,14 @@ def part(self, channel):
         """
         raise NotImplementedError
 
+    def is_nick_valid(self, nick):
+        """
+        Determines if a nick is valid for this connection
+        :param nick: The nick to check
+        :return: True if it is valid, otherwise false
+        """
+        raise NotImplementedError
+
     @property
     def connected(self):
         raise NotImplementedError

cloudbot/clients/irc.py

@@ -16,6 +16,8 @@
 irc_netmask_re = re.compile(r"([^!@]*)!([^@]*)@(.*)")
 irc_param_re = re.compile(r"(?:^|(?<= ))(:.*|[^ ]+)")
 
+irc_nick_re = re.compile(r'[A-Za-z0-9^{\}\[\]\-`_|]')
+
 irc_bad_chars = ''.join([chr(x) for x in list(range(0, 1)) + list(range(4, 32)) + list(range(127, 160))])
 irc_clean_re = re.compile('[{}]'.format(re.escape(irc_bad_chars)))
 
@@ -225,6 +227,9 @@ def _send(self, line):
     def connected(self):
         return self._connected
 
+    def is_nick_valid(self, nick):
+        return bool(irc_nick_re.fullmatch(nick))
+
 
 class _IrcProtocol(asyncio.Protocol):
     """

cloudbot/event.py

@@ -324,6 +324,14 @@ def async_call(self, func, *args, **kwargs):
         result = yield from self.loop.run_in_executor(executor, part)
         return result
 
+    def is_nick_valid(self, nick):
+        """
+        Returns whether a nick is valid for a given connection
+        :param nick: The nick to check
+        :return: Whether or not it is valid
+        """
+        return self.conn.is_nick_valid(nick)
+
     if sys.version_info < (3, 7, 0):
         # noinspection PyCompatibility
         @asyncio.coroutine