From 729d1424edc4abb44d2a3fb210895651cd2890ac Mon Sep 17 00:00:00 2001
From: jesopo <github@lolnerd.net>
Date: Thu, 8 Nov 2018 11:37:23 +0000
Subject: [PATCH] Unescape message-tags as per spec Escaping Rules

---
 src/utils/irc.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/utils/irc.py b/src/utils/irc.py
index a128a565..7b82e791 100644
--- a/src/utils/irc.py
+++ b/src/utils/irc.py
@@ -78,6 +78,13 @@ class IRCLine(object):
         self.args = args
         self.has_arbitrary = has_arbitrary
 
+MESSAGE_TAG_ESCAPED = [r"\:", r"\s", r"\\", r"\r", r"\n"]
+MESSAGE_TAG_UNESCAPED = [";", " ", "\\", "\r", "\n"]
+def message_tag_escape(s):
+    return _multi_replace(s, MESSAGE_TAG_UNESCAPED, MESSAGE_TAG_ESCAPED)
+def message_tag_unescape(s):
+    return _multi_replace(s, MESSAGE_TAG_ESCAPED, MESSAGE_TAG_UNESCAPED)
+
 def parse_line(line: str) -> IRCLine:
     tags = {}
     prefix = typing.Optional[IRCHostmask]
@@ -85,6 +92,8 @@ def parse_line(line: str) -> IRCLine:
 
     if line[0] == "@":
         tags_prefix, line = line[1:].split(" ", 1)
+        tags_prefix = message_tag_unescape(tags_prefix)
+
         if tags_prefix[0] == "{":
             tags = json.loads(tags_prefix)
         else: