<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _handleAuthenticationEvents(self, requestdata, requestaction, clientuuid, sock):
 """Handler for authentication events"""


        # TODO: Move this stuff over to ./auth.py
        if requestaction in ("login", "autologin"):
            try:
                self.log("Login request", lvl=verbose)

                if requestaction == "autologin":
                    username = password = None
                    requestedclientuuid = requestdata
                    auto = True

                    self.log("Autologin for", requestedclientuuid, lvl=debug)
                else:
                    username = requestdata['username']
                    password = requestdata['password']

                    if 'clientuuid' in requestdata:
                        requestedclientuuid = requestdata['clientuuid']
                    else:
                        requestedclientuuid = None
                    auto = False

                    self.log("Auth request by", username, lvl=verbose)

                self.fireEvent(authenticationrequest(
                    username,
                    password,
                    clientuuid,
                    requestedclientuuid,
                    sock,
                    auto,
                ), "auth")
                return
            except Exception as e:
                self.log("Login failed: ", e, type(e), lvl=warn, exc=True)
        elif requestaction == "logout":
            self.log("User logged out, refreshing client.", lvl=network)
            try:
                if clientuuid in self._clients:
                    client = self._clients[clientuuid]
                    user_id = client.useruuid
                    if client.useruuid:
                        self.log("Logout client uuid: ", clientuuid)
                        self._logoutclient(client.useruuid, clientuuid)
                    self.fireEvent(clientdisconnect(clientuuid))
                else:
                    self.log("Client is not connected!", lvl=warn)
            except Exception as e:
                self.log("Error during client logout: ", e, type(e),
                         lvl=error, exc=True)
        else:
            self.log("Unsupported auth action requested:",
                     requestaction, lvl=warn)