6473: Better method for resolving handles to buddies

src/sugar/presence/Makefile.am

@@ -3,6 +3,7 @@ sugar_PYTHON =			\
 	__init__.py		\
 	activity.py		\
 	buddy.py		\
+	sugartubeconn.py	\
 	tubeconn.py		\
 	presenceservice.py
 

src/sugar/presence/sugartubeconn.py

@@ -0,0 +1,60 @@
+"""Subclass of TubeConnection that converts handles to Sugar Buddies"""
+# Copyright (C) 2008 One Laptop Per Child
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published
+# by the Free Software Foundation; either version 2.1 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+from telepathy.constants import (
+    CHANNEL_GROUP_FLAG_CHANNEL_SPECIFIC_HANDLES)
+
+from tubeconn import TubeConnection
+import presenceservice
+
+
+class SugarTubeConnection(TubeConnection):
+    """Subclass of TubeConnection that converts handles to Sugar Buddies"""
+
+    def __new__(cls, conn, tubes_iface, tube_id, address=None,
+                group_iface=None, mainloop=None):
+        self = super(SugarTubeConnection, cls).__new__(
+            cls, conn, tubes_iface, tube_id, address=address,
+            group_iface=group_iface, mainloop=mainloop)
+        self._conn = conn
+        self._group_iface = group_iface
+        return self
+
+    def get_buddy(self, cs_handle):
+        """Retrieve a Buddy object given a telepathy handle.
+
+        cs_handle: A channel-specific CONTACT type handle.
+        returns: sugar.presence Buddy object or None
+        """
+        pservice = presenceservice.get_instance()
+        if self.self_handle == cs_handle:
+            # It's me, just get my global handle
+            handle = self._conn.GetSelfHandle()
+        elif self._group_iface.GetGroupFlags() & \
+            CHANNEL_GROUP_FLAG_CHANNEL_SPECIFIC_HANDLES:
+            # The group (channel) has channel specific handles
+            handle = self._group_iface.GetHandleOwners([cs_handle])[0]
+        else:
+            # The group does not have channel specific handles
+            handle = cs_handle
+
+        # deal with failure to get the handle owner
+        if handle == 0:
+            return None
+        return pservice.get_buddy_by_telepathy_handle(
+            self._conn.service_name, self._conn.object_path, handle)