add ban_enforce.py, to kick people affected by new bans

modules/ban_enforce.py

@@ -0,0 +1,27 @@
+from src import ModuleManager, utils
+
+REASON = "User is banned from this channel"
+
+@utils.export("channelset", utils.BoolSetting("ban-enforce",
+    "Whether or not to parse new bans and kick who they affect"))
+class Module(ModuleManager.BaseModule):
+    @utils.hook("received.mode.channel")
+    def on_mode(self, event):
+        if event["channel"].get_setting("ban-enforce", False):
+            bans = []
+            kicks = set([])
+            for mode, arg in event["modes"]:
+                if mode[0] == "+" and mode[1] == "b":
+                    bans.append(arg)
+
+            if bans:
+                umasks = {u.hostmask(): u for u in event["channel"].users}
+                for ban in bans:
+                    mask = utils.irc.hostmask_parse(ban)
+                    matches = list(utils.irc.hostmask_match_many(
+                        umasks.keys(), mask))
+                    for match in matches:
+                        kicks.add(umasks[match])
+            if kicks:
+                nicks = [u.nickname for u in kicks]
+                event["channel"].send_kicks(sorted(nicks), REASON)