From f5f819ead1453ef1b817f843890686a5685632cf Mon Sep 17 00:00:00 2001
From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
Date: Tue, 28 May 2024 15:37:12 +0200
Subject: Add user filter to greeter's user list.

---
 data/org.ArcticaProject.arctica-greeter.gschema.xml |  8 ++++++++
 src/settings.vala                                   |  2 ++
 src/user-list.vala                                  | 14 ++++++++++++++
 3 files changed, 24 insertions(+)

diff --git a/data/org.ArcticaProject.arctica-greeter.gschema.xml b/data/org.ArcticaProject.arctica-greeter.gschema.xml
index 67f8e83..56ef09b 100644
--- a/data/org.ArcticaProject.arctica-greeter.gschema.xml
+++ b/data/org.ArcticaProject.arctica-greeter.gschema.xml
@@ -174,6 +174,14 @@
       <default>[]</default>
       <summary>List of usernames that are hidden until a special key combination is hit.</summary>
     </key>
+    <key name="user-filter" type="as">
+      <default>[]</default>
+      <summary>List of usernames that are to be shown in the userlist only.</summary>
+    </key>
+    <key name="user-filter-always" type="b">
+      <default>false</default>
+      <summary>Always filter-out users not listed in user-filter even if user-filter is empty.</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>
diff --git a/src/settings.vala b/src/settings.vala
index 7d1ce8f..6bdfe5d 100644
--- a/src/settings.vala
+++ b/src/settings.vala
@@ -56,6 +56,8 @@ public class AGSettings : Object
     public const string KEY_PLAY_READY_SOUND = "play-ready-sound";
     public const string KEY_INDICATORS = "indicators";
     public const string KEY_HIDDEN_USERS = "hidden-users";
+    public const string KEY_USER_FILTER= "user-filter";
+    public const string KEY_USER_FILTER_ALWAYS = "user-filter-always";
     public const string KEY_GROUP_FILTER = "group-filter";
     public const string KEY_IDLE_TIMEOUT = "idle-timeout";
     public const string KEY_ACTIVATE_NUMLOCK = "activate-numlock";
diff --git a/src/user-list.vala b/src/user-list.vala
index dee3850..3936768 100644
--- a/src/user-list.vala
+++ b/src/user-list.vala
@@ -1128,6 +1128,20 @@ public class UserList : GreeterList
                     return;
         }
 
+        var user_filter = AGSettings.get_strv (AGSettings.KEY_USER_FILTER);
+        bool user_filter_always = AGSettings.get_boolean (AGSettings.KEY_USER_FILTER_ALWAYS);
+
+        if ((user_filter_always) || (user_filter.length != 0))
+        {
+            var match_found = false;
+            foreach (var username in user_filter)
+                if (username == user.name)
+                    match_found = true;
+            // bail-out if user.name is not in user_filter
+            if (match_found == false)
+                return;
+        }
+
         if (!filter_group (user.name))
             return;
 
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