[IMP] mail: make channels check their members instead of followers for alias

This commit makes channel use 'followers' based alias security use members
instead. Indeed channels do not use followers anymore. Instead channels
have members, and alias security of followers should use members instead.

addons/mail/models/mail_channel.py

@@ -232,6 +232,16 @@ class Channel(models.Model):
         message = super(Channel, self.with_context(mail_create_nosubscribe=True)).message_post(body=body, subject=subject, message_type=message_type, subtype=subtype, parent_id=parent_id, attachments=attachments, content_subtype=content_subtype, **kwargs)
         return message
 
+    def _alias_check_contact(self, message, message_dict, alias):
+        if alias.alias_contact == 'followers' and self.ids:
+            author = self.env['res.partner'].browse(message_dict.get('author_id', False))
+            if not author or author not in self.channel_partner_ids:
+                return {
+                    'error_mesage': _('restricted to channel members'),
+                }
+            return True
+        return super(Channel, self)._alias_check_contact(message, message_dict, alias)
+
     @api.model_cr
     def init(self):
         self._cr.execute('SELECT indexname FROM pg_indexes WHERE indexname = %s', ('mail_channel_partner_seen_message_id_idx',))