# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1411570112 -7200
# Node ID c38609e4aef22fb1fb9cfa4d86fc131f13117c4b
# Parent  d3472eab62fc417120a9417f3f3c9a745d00dc5d
Ignore invalid input and adopt a conservative error strategy.

diff -r d3472eab62fc -r c38609e4aef2 imip_agent.py
--- a/imip_agent.py	Wed Sep 24 16:35:16 2014 +0200
+++ b/imip_agent.py	Wed Sep 24 16:48:32 2014 +0200
@@ -27,21 +27,7 @@
 
 # Postfix exit codes.
 
-EX_USAGE        = 64
-EX_DATAERR      = 65
-EX_NOINPUT      = 66
-EX_NOUSER       = 67
-EX_NOHOST       = 68
-EX_UNAVAILABLE  = 69
-EX_SOFTWARE     = 70
-EX_OSERR        = 71
-EX_OSFILE       = 72
-EX_CANTCREAT    = 73
-EX_IOERR        = 74
 EX_TEMPFAIL     = 75
-EX_PROTOCOL     = 76
-EX_NOPERM       = 77
-EX_CONFIG       = 78
 
 # Permitted iTIP content types.
 
@@ -263,8 +249,11 @@
     f = StringIO(part.get_payload(decode=True))
 
     itip = parse_object(f, part.get_content_charset(), "VCALENDAR")
+
+    # Ignore the part if not a calendar object.
+
     if not itip:
-        sys.exit(EX_DATAERR)
+        return []
 
     # Only handle calendar information.