Improve timestamp usage for MAM

- Use new parse_datetime() method
- Drop message with error if MAM doesnt supply a timestamp.
- If the user supplys an own timestamp, save it so we can decide in the
future how to display it.

gajim/common/connection_handlers_events.py

@@ -1059,7 +1059,7 @@ class MamMessageReceivedEvent(nec.NetworkIncomingEvent, HelperEvent):
 
         if frm.bareMatch(own_jid):
             self.stanza_id = self.msg_.getOriginID()
-            if not self.stanza_id:
+            if self.stanza_id is None:
                 self.stanza_id = self.msg_.getID()
 
             self.with_ = to
@@ -1073,20 +1073,30 @@ class MamMessageReceivedEvent(nec.NetworkIncomingEvent, HelperEvent):
             self.with_ = frm
             self.kind = KindConstant.CHAT_MSG_RECV
 
-        if not self.stanza_id:
+        if self.stanza_id is None:
             log.debug('Could not retrieve stanza-id')
 
-        # Use timestamp provided by archive,
+        delay = self.forwarded.getTagAttr(
-        # Fallback: Use timestamp provided by user and issue a warning
+            'delay', 'stamp', namespace=nbxmpp.NS_DELAY2)
-        delay = self.forwarded.getTag('delay', namespace=nbxmpp.NS_DELAY2)
+        if delay is None:
-        if not delay:
-            log.warning('No timestamp on archive Message, try fallback')
-            delay = self.msg_.getTag('delay', namespace=nbxmpp.NS_DELAY2)
-        if not delay:
             log.error('Received MAM message without timestamp')
             return
 
-        self.timestamp = helpers.parse_delay(delay)
+        self.timestamp = helpers.parse_datetime(
+            delay, check_utc=True, epoch=True)
+        if self.timestamp is None:
+            log.error('Received MAM message with invalid timestamp: %s', delay)
+            return
+
+        # Save timestamp added by the user
+        user_delay = self.msg_.getTagAttr(
+            'delay', 'stamp', namespace=nbxmpp.NS_DELAY2)
+        if user_delay is not None:
+            self.user_timestamp = helpers.parse_datetime(
+                user_delay, check_utc=True, epoch=True)
+            if self.user_timestamp is None:
+                log.warning('Received MAM message with '
+                            'invalid user timestamp: %s', user_delay)
 
         log.debug('Received mam-message: stanza id: %s', self.stanza_id)
         return True

gajim/common/helpers.py

@@ -673,34 +673,6 @@ def datetime_tuple(timestamp):
         tim = tim.timetuple()
     return tim
 
-def parse_delay(timestamp):
-    '''
-    Parse a timestamp
-    https://xmpp.org/extensions/xep-0203.html
-    Note: Not all delay tags should be parsed with this method
-    see https://xmpp.org/extensions/xep-0082.html for more information
-
-    :param timestamp: a XEP-0203 fomated timestring string or a delay Node
-    
-    Examples:
-    '2017-11-05T01:41:20Z'
-    '2017-11-05T01:41:20.123Z'
-
-    return epoch UTC timestamp
-    '''
-    if isinstance(timestamp, nbxmpp.protocol.Node):
-        timestamp = timestamp.getAttr('stamp')
-    timestamp += '+0000'
-    try:
-        datetime_ = datetime.strptime(timestamp, '%Y-%m-%dT%H:%M:%SZ%z')
-    except ValueError:
-        try:
-            datetime_ = datetime.strptime(timestamp, '%Y-%m-%dT%H:%M:%S.%fZ%z')
-        except ValueError:
-            log.error('Could not parse delay timestamp: %s', timestamp)
-            raise
-    return datetime_.timestamp()
-
 def parse_datetime(timestring, check_utc=False, convert='utc', epoch=False):
     '''
     Parse a XEP-0082 DateTime Profile String