ircbot: sanitize email subjects

Email subjects may contain line breaks if they are too long to fit in 72
columns. The supybot library does not support sending messages with line
breaks. It raises an error. Replace all consecutive "white space"
characters (including \r and \n) with regular space characters.

Signed-off-by: Robin Jarry <robin@jarry.cc>

1 files changed, 5 insertions, 3 deletions

diff --git a/contrib/ircbot/Sourcehut/plugin.py b/contrib/ircbot/Sourcehut/plugin.py
index 593ad020..a7d0b46c 100644
--- a/contrib/ircbot/Sourcehut/plugin.py
+++ b/contrib/ircbot/Sourcehut/plugin.py
@@ -4,8 +4,10 @@ import json
 import mailbox
 from urllib.parse import quote
 from urllib.request import urlopen
+import re
+import traceback
 
-from supybot import callbacks, httpserver, ircmsgs, log, world
+from supybot import callbacks, httpserver, ircmsgs, world
 from supybot.ircutils import bold, italic, mircColor, underline
 
 
@@ -89,7 +91,7 @@ class SourcehutServerCallback(httpserver.SupyHTTPServerCallback):
             print(f"GET {url}/raw")
             with urlopen(f"{url}/raw") as u:
                 msg = mailbox.Message(u.read())
-            subject = decode_header(msg["subject"])
+            subject = re.sub(r"\s+", " ", decode_header(msg["subject"]))
             if not subject.startswith("[PATCH"):
                 continue
             for name, addr in email.utils.getaddresses([decode_header(msg["from"])]):
@@ -127,7 +129,7 @@ class SourcehutServerCallback(httpserver.SupyHTTPServerCallback):
             raise ValueError(f"unsupported webhook: {hook}")
 
         except Exception as e:
-            print("ERROR", e)
+            traceback.print_exception(e)
             handler.send_response(400)
             handler.end_headers()
             handler.wfile.write(b"Bad request\n")