Implement better handling of corner cases

lib/nntp/tiny/mbox.py

@@ -1,5 +1,6 @@
 import re
 import enum
+import datetime
 
 from dateparser.search import search_dates
 from email.header      import decode_header
@@ -44,7 +45,7 @@ class MBoxReaderBuffer():
         return self.lines[line][0:5] == 'From '
 
     def is_header_line(self, line):
-        return re.match('^([^:]+): (.*)$', self.lines[line]) is not None
+        return re.match('^([A-Za-z0-9\\-]+): (.*)$', self.lines[line]) is not None
 
     def is_start(self):
         if self.lines[0] is None or self.lines[1] is None:
@@ -67,9 +68,12 @@ def decode(text: str):
     decoded = decode_header(text)[0]
 
     if decoded[1] is None:
-        return decoded[0]
+        return str(decoded[0])
 
-    return str(decoded[0], decoded[1])
+    try:
+        return str(decoded[0], decoded[1])
+    except:
+        return str(decoded[0])
 
 class MBoxMessage():
     __slots__ = 'state', 'headers', 'line', 'content', 'body', 'key',
@@ -113,7 +117,16 @@ class MBoxMessage():
         return self.headers.get(key.lower())
 
     def date(self):
-        return search_dates(self.headers['date'])[0][1]
+        try:
+            return search_dates(self.headers['date'])[0][1]
+        except:
+            return datetime.datetime.fromtimestamp(0)
+
+    def sender(self):
+        return self.headers.get('from', 'Unknown')
+
+    def subject(self):
+        return self.headers.get('subject', '(no subject)')
 
     def is_first_line(self):
         return len(self.headers) == 1 and (self.body == '' or self.body is None)