From a18ab60939f72eb4c4b4c057790d14bcdeb3ec56 Mon Sep 17 00:00:00 2001
From: Robert Ancell <robert.ancell@canonical.com>
Date: Wed, 16 Sep 2015 08:58:28 -0400
Subject: Add an option to only show users in a list of specified groups

 Ported to ArcticaGreeter: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
---
 .../org.ArcticaProject.arctica-greeter.gschema.xml |  4 +++
 src/settings.vala                                  |  1 +
 src/user-list.vala                                 | 31 ++++++++++++++++++++++
 3 files changed, 36 insertions(+)

diff --git a/data/org.ArcticaProject.arctica-greeter.gschema.xml b/data/org.ArcticaProject.arctica-greeter.gschema.xml
index b4a8d59..aa40544 100644
--- a/data/org.ArcticaProject.arctica-greeter.gschema.xml
+++ b/data/org.ArcticaProject.arctica-greeter.gschema.xml
@@ -94,6 +94,10 @@
       <default>[]</default>
       <summary>List of usernames that are hidden until a special key combination is hit</summary>
     </key>
+    <key name="group-filter" type="as">
+      <default>[]</default>
+      <summary>List of groups that users must be part of to be shown (empty list shows all users)</summary>
+    </key>
     <key name="idle-timeout" type="i">
       <default>300</default>
       <summary>Number of seconds of inactivity before blanking the screen. Set to 0 to never timeout.</summary>
diff --git a/src/settings.vala b/src/settings.vala
index 6757b9c..9aef819 100644
--- a/src/settings.vala
+++ b/src/settings.vala
@@ -40,6 +40,7 @@ public class AGSettings
     public static const string KEY_PLAY_READY_SOUND = "play-ready-sound";
     public static const string KEY_INDICATORS = "indicators";
     public static const string KEY_HIDDEN_USERS = "hidden-users";
+    public static const string KEY_GROUP_FILTER = "group-filter";
     public static const string KEY_IDLE_TIMEOUT = "idle-timeout";    
     public static const string KEY_REMOTE_SERVICE_FQDN = "remote-service-fqdn";
 
diff --git a/src/user-list.vala b/src/user-list.vala
index 4805956..a4e4099 100644
--- a/src/user-list.vala
+++ b/src/user-list.vala
@@ -1044,6 +1044,9 @@ public class UserList : GreeterList
                     return;
         }
 
+        if (!filter_group (user.name))
+            return;
+
         var label = user.real_name;
         if (user.real_name == "")
             label = user.name;
@@ -1051,6 +1054,34 @@ public class UserList : GreeterList
         add_user (user.name, label, user.background, user.logged_in, user.has_messages, user.session);
     }
 
+    private bool filter_group (string user_name)
+    {
+        var group_filter = UGSettings.get_strv (UGSettings.KEY_GROUP_FILTER);
+
+        /* Empty list means do not filter by group */
+        if (group_filter.length == 0)
+            return true;
+
+        foreach (var group_name in group_filter)
+            if (in_group (group_name, user_name))
+                return true;
+
+        return false;
+    }
+
+    private bool in_group (string group_name, string user_name)
+    {
+        unowned Posix.Group? group = Posix.getgrnam (group_name);
+        if (group == null)
+            return false;
+
+        foreach (var name in group.gr_mem)
+            if (name == user_name)
+                return true;
+
+        return false;
+    }
+
     private void user_removed_cb (LightDM.User user)
     {
         debug ("Removing user %s", user.name);
-- 
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