Case-insensitively compare the bot's nick when checking for PMs

Closes #161.

src/handler.py

@@ -1,9 +1,9 @@
 # The bot commands implemented in here are present no matter which module is loaded
 
-import traceback
 import base64
 import socket
 import sys
+import traceback
 
 from oyoyo.parse import parse_nick
 
@@ -19,7 +19,6 @@ sys.stderr.target_logger = log
 hook = decorators.hook
 
 def on_privmsg(cli, rawnick, chan, msg, notice = False):
-
     try:
         prefixes = getattr(var, "STATUSMSG_PREFIXES")
     except AttributeError:
@@ -28,11 +27,20 @@ def on_privmsg(cli, rawnick, chan, msg, notice = False):
         if botconfig.IGNORE_HIDDEN_COMMANDS and chan[0] in prefixes:
             return
 
-    if (notice and ((chan != botconfig.NICK and not botconfig.ALLOW_NOTICE_COMMANDS) or
-                    (chan == botconfig.NICK and not botconfig.ALLOW_PRIVATE_NOTICE_COMMANDS))):
+    try:
+        getattr(var, "CASEMAPPING")
+    except AttributeError:
+        var.CASEMAPPING = "rfc1459"
+
+        if not (notice and "!" not in rawnick and chan in ("*", "AUTH")):
+            # Not an on-connect message before RPL_ISUPPORT.
+            log("Server did not send a case mapping; falling back to rfc1459.")
+
+    if (notice and ((not var.irc_equals(chan, botconfig.NICK) and not botconfig.ALLOW_NOTICE_COMMANDS) or
+                    (var.irc_equals(chan, botconfig.NICK) and not botconfig.ALLOW_PRIVATE_NOTICE_COMMANDS))):
         return  # not allowed in settings
 
-    if chan == botconfig.NICK:
+    if var.irc_equals(chan, botconfig.NICK):
         chan = parse_nick(rawnick)[0]
 
     for fn in decorators.COMMANDS[""]:

src/settings.py

@@ -378,6 +378,24 @@ def check_priv(priv):
 is_admin = check_priv("admin")
 is_owner = check_priv("owner")
 
+def irc_lower(nick):
+    mapping = {
+        "[": "{",
+        "]": "}",
+        "\\": "|",
+        "^": "~",
+    }
+
+    if CASEMAPPING == "strict-rfc1459":
+        mapping.pop("^")
+    elif CASEMAPPING == "ascii":
+        mapping = {}
+
+    return nick.lower().translate(str.maketrans(mapping))
+
+def irc_equals(nick1, nick2):
+    return irc_lower(nick1) == irc_lower(nick2)
+
 def plural(role):
     bits = role.split()
     bits[-1] = {"person": "people", "wolf": "wolves"}.get(bits[-1], bits[-1] + "s")

src/wolfgame.py

@@ -5877,6 +5877,13 @@ def getfeatures(cli, nick, *rest):
                 pass
         if r.startswith("STATUSMSG="):
             var.STATUSMSG_PREFIXES = list(r.split("=")[1])
+        if r.startswith("CASEMAPPING="):
+            var.CASEMAPPING = r.split("=")[1]
+
+            if var.CASEMAPPING not in ("rfc1459", "strict-rfc1459", "ascii"):
+                # This is very unlikely to happen, but just in case.
+                errlog("Unsupported case mapping: {0!r}; falling back to rfc1459.".format(var.CASEMAPPING))
+                var.CASEMAPPING = "rfc1459"
 
 def mass_privmsg(cli, targets, msg, notice=False, privmsg=False):
     if not notice and not privmsg: