# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1506889931 -7200
# Node ID c3c9e3dd3213662279e11fc770c152208dca494c
# Parent  e63ea84b61ff4360811ecbd25c23a50be96590a8
Introduced a method to handle event versioning and sending updates.

diff -r e63ea84b61ff -r c3c9e3dd3213 imiptools/client.py
--- a/imiptools/client.py	Sun Oct 01 17:41:21 2017 +0200
+++ b/imiptools/client.py	Sun Oct 01 22:32:11 2017 +0200
@@ -727,15 +727,50 @@
         """
 
         attendee_attr = uri_dict(self.obj.get_value_map("ATTENDEE")).get(self.user)
+
         if not attendee_attr:
             return None
+
+        # Set the participation and remove any request for response indicator.
+
         if partstat:
             attendee_attr["PARTSTAT"] = partstat
         if attendee_attr.has_key("RSVP"):
             del attendee_attr["RSVP"]
-        self.update_sender_attr(attendee_attr)
+
         return attendee_attr
 
+    def update_event(self, changed=False):
+
+        """
+        Update the event version information and details for sending. Where
+        'changed' is set to a true value for the attendee, the attendee list
+        will be processed and preserved; otherwise, the attendee replying will
+        be retained and the others removed from the object.
+        """
+
+        if self.is_organiser():
+            self.update_sender()
+        else:
+            # Reply only on behalf of this user.
+
+            attendee_attr = self.update_participation()
+
+            if not attendee_attr:
+                return False
+
+            if not changed:
+                self.obj["ATTENDEE"] = [(self.user, attendee_attr)]
+
+        # Process attendee SENT-BY usage, timestamp and sequence details
+        # appropriately for the sender's role.
+
+        self.update_senders()
+        self.update_dtstamp()
+        self.update_sequence()
+
+        return True
+
     # General message generation methods.
 
     def get_recipients(self, obj=None):
@@ -968,21 +1003,9 @@
         will be sent instead of a reply.
         """
 
-        # Reply only on behalf of this user.
-
-        attendee_attr = self.update_participation()
-
-        if not attendee_attr:
+        if not self.update_event(changed):
             return False
 
-        if not changed:
-            self.obj["ATTENDEE"] = [(self.user, attendee_attr)]
-        else:
-            self.update_senders()
-
-        self.update_dtstamp()
-        self.update_sequence()
-
         parts = [self.object_to_part(changed and "COUNTER" or "REPLY", self.obj)]
 
         # Create and send the response.
@@ -1014,10 +1037,7 @@
         recurrence instances that are already stored.
         """
 
-        self.update_sender()
-        self.update_senders()
-        self.update_dtstamp()
-        self.update_sequence()
+        self.update_event()
 
         if method == "REQUEST":