[PATCH v3 5/8] nmbug-status: Escape &, <, and > in HTML display data

["W. Trevor King" <wking@tremily.us>]

'message-id' and 'from' now have sensitive characters escaped using
xml.sax.saxutils.escape [1].  The 'subject' data was already being
converted to a link into Gmane; I've escape()d that too, so it doesn't
need to be handled ain the same block as 'message-id' and 'from'.

This prevents broken HTML by if subjects etc. contain characters that
would otherwise be interpreted as HTML markup.

[1]: http://docs.python.org/3/library/xml.sax.utils.html#xml.sax.saxutils.escape
---
 devel/nmbug/nmbug-status | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/devel/nmbug/nmbug-status b/devel/nmbug/nmbug-status
index 92552a4..57eec6c 100755
--- a/devel/nmbug/nmbug-status
+++ b/devel/nmbug/nmbug-status
@@ -24,6 +24,7 @@ import os
 import re
 import sys
 import subprocess
+import xml.sax.saxutils
 
 
 _ENCODING = locale.getpreferredencoding() or sys.getdefaultencoding()
@@ -229,11 +230,14 @@ class HtmlPage (Page):
         if 'subject' in display_data and 'message-id' in display_data:
             d = {
                 'message-id': quote(display_data['message-id']),
-                'subject': display_data['subject'],
+                'subject': xml.sax.saxutils.escape(display_data['subject']),
                 }
             display_data['subject'] = (
                 '<a href="http://mid.gmane.org/{message-id}">{subject}</a>'
                 ).format(**d)
+        for key in ['message-id', 'from']:
+            if key in display_data:
+                display_data[key] = xml.sax.saxutils.escape(display_data[key])
         return (running_data, display_data)
 
     def _slug(self, string):
-- 
1.8.5.2.8.g0f6c0d1