Implement GPO and add administrative templates

common/Helpers/GPOHelper.cs

@@ -0,0 +1,88 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+using Microsoft.Win32;
+using Serilog;
+
+namespace DevHome.Common.Helpers;
+
+public class GPOHelper
+{
+    private static readonly ILogger _log = Log.ForContext("SourceContext", nameof(GPOHelper));
+
+    private enum GpoRuleConfigured
+    {
+        WrongValue = -3, // The policy is set to an unrecognized value
+        Unavailable = -2, // Couldn't access registry
+        NotConfigured = -1, // Policy is not configured
+        Disabled = 0, // Policy is disabled
+        Enabled = 1, // Policy is enabled
+    }
+
+    // Registry path where gpo policy values are stored
+    private const string PoliciesScopeMachine = "HKEY_LOCAL_MACHINE";
+    private const string PoliciesPath = @"\SOFTWARE\Policies\DevHome";
+
+    // Registry value names
+    private const string PolicyConfigureEnabledDevHome = "ConfigureEnabledDevHome";
+
+    private static GpoRuleConfigured GetConfiguredValue(string registryValueName)
+    {
+        try
+        {
+            var rawValue = Registry.GetValue(
+                keyName: PoliciesScopeMachine + PoliciesPath,
+                valueName: registryValueName,
+                defaultValue: GpoRuleConfigured.NotConfigured);
+
+            _log.Error($"Registry value {registryValueName} set to {rawValue}");
+
+            // Value will be null if the subkey specified by keyName does not exist.
+            if (rawValue == null)
+            {
+                return GpoRuleConfigured.NotConfigured;
+            }
+            else if (rawValue is not int && rawValue is not GpoRuleConfigured)
+            {
+                return GpoRuleConfigured.WrongValue;
+            }
+            else
+            {
+                return (GpoRuleConfigured)rawValue;
+            }
+        }
+        catch (System.Security.SecurityException)
+        {
+            // The user does not have the permissions required to read from the registry key.
+            return GpoRuleConfigured.Unavailable;
+        }
+        catch (System.IO.IOException)
+        {
+            // The RegistryKey that contains the specified value has been marked for deletion.
+            return GpoRuleConfigured.Unavailable;
+        }
+        catch (System.ArgumentException)
+        {
+            // keyName does not begin with a valid registry root.
+            return GpoRuleConfigured.NotConfigured;
+        }
+    }
+
+    private static bool EvaluateConfiguredValue(string registryValueName, GpoRuleConfigured defaultValue)
+    {
+        var configuredValue = GetConfiguredValue(registryValueName);
+        if (configuredValue < 0)
+        {
+            _log.Error($"Registry value {registryValueName} set to {configuredValue}, using default {defaultValue} instead.");
+            configuredValue = defaultValue;
+        }
+
+        return configuredValue == GpoRuleConfigured.Enabled;
+    }
+
+    public static bool GetConfiguredEnabledDevHomeValue()
+    {
+        var defaultValue = GpoRuleConfigured.Enabled;
+        return EvaluateConfiguredValue(PolicyConfigureEnabledDevHome, defaultValue);
+    }
+}

src/Strings/en-us/Resources.resw

@@ -286,4 +286,10 @@
   <data name="WidgetScreenshotAltDisplaySSKeychain" xml:space="preserve">
     <value>SSH Keychain widget preview image</value>
   </data>
+  <data name="GPODisabledDevHomeHeader.Text" xml:space="preserve">
+    <value>Dev Home is blocked</value>
+  </data>
+  <data name="GPODisabledDevHomeDescription.Text" xml:space="preserve">
+    <value>Check with your IT or System Administrator for support.</value>
+  </data>
 </root>

src/ViewModels/ShellViewModel.cs

@@ -35,6 +35,9 @@ public partial class ShellViewModel : ObservableObject
     [ObservableProperty]
     private InfoBarModel _shellInfoBarModel = new();
 
+    [ObservableProperty]
+    private bool _isDevHomeGPOEnabled;
+
     public ShellViewModel(
         INavigationService navigationService,
         INavigationViewService navigationViewService,
@@ -59,6 +62,12 @@ public void OnLoaded()
         Log.Information($"Activated with kind {activationKind}");
         TelemetryFactory.Get<ITelemetry>().Log("DevHome_Shell_Loaded_Event", LogLevel.Critical, new DevHomeShellLoadedEvent(activationKind));
 
+        IsDevHomeGPOEnabled = GPOHelper.GetConfiguredEnabledDevHomeValue();
+        if (!IsDevHomeGPOEnabled)
+        {
+            return;
+        }
+
         switch (activationKind)
         {
             case ExtendedActivationKind.File:

src/Views/ShellPage.xaml

@@ -6,7 +6,11 @@
     xmlns:behaviors="using:DevHome.Common.Behaviors"
     xmlns:i="using:Microsoft.Xaml.Interactivity"
     xmlns:windows="using:DevHome.Common.Windows"
+    xmlns:converters="using:CommunityToolkit.WinUI.Converters"
     Loaded="OnLoaded">
+    <Page.Resources>
+        <converters:BoolToVisibilityConverter x:Key="NegatedBoolToVisibilityConverter" TrueValue="Collapsed" FalseValue="Visible" />
+    </Page.Resources>
 
     <Grid>
         <Grid.RowDefinitions>
@@ -30,7 +34,8 @@
             OpenPaneLength="350"
             ExpandedModeThresholdWidth="1280"
             DisplayModeChanged="NavigationViewControl_DisplayModeChanged"
-            Header="{x:Bind ((ContentControl)ViewModel.Selected).Content, Mode=OneWay}">
+            Header="{x:Bind ((ContentControl)ViewModel.Selected).Content, Mode=OneWay}"
+            Visibility="{x:Bind ViewModel.IsDevHomeGPOEnabled, Mode=OneWay}">
             <NavigationView.Resources>
                 <ResourceDictionary>
                     <ResourceDictionary.ThemeDictionaries>
@@ -115,6 +120,21 @@
             </Grid>
         </NavigationView>
 
+        <StackPanel
+            Grid.Row="1"
+            HorizontalAlignment="Center"
+            VerticalAlignment="Center"
+            Visibility="{x:Bind ViewModel.IsDevHomeGPOEnabled, Mode=OneWay, Converter={StaticResource NegatedBoolToVisibilityConverter}}">
+            <TextBlock
+                x:Uid="GPODisabledDevHomeHeader"
+                Style="{StaticResource HeaderTextBlockStyle}"
+                HorizontalTextAlignment="Center"/>
+            <TextBlock
+                x:Uid="GPODisabledDevHomeDescription"
+                Style="{StaticResource SubheaderTextBlockStyle}"
+                HorizontalTextAlignment="Center"/>
+        </StackPanel>
+
         <!-- A "hidden" TextBlock read by the narrator on value change.
              Setting the visibility to Collapsed prevents the screen reader
              from reading the control value. -->

src/gpo/assets/DevHome.admx

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) Microsoft Corporation.
+     Licensed under the MIT License. -->
+<policyDefinitions xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" revision="0.1900" schemaVersion="1.0" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
+  <policyNamespaces>
+    <target prefix="devhome" namespace="Microsoft.Policies.DevHome" />
+  </policyNamespaces>
+  <resources minRequiredRevision="0.1900"/>
+  <supportedOn>
+    <definitions>
+      <definition name="SUPPORTED_DEVHOME_0_1900" displayName="$(string.SUPPORTED_DEVHOME_0_1900)"/>
+    </definitions>
+  </supportedOn>
+  <categories>
+    <category name="DevHome" displayName="$(string.DevHome)" />
+  </categories>
+
+  <policies>
+
+ <!--The name (id) of the policy is different from the valueName to sort it as first policy in edit dialog. The order is sorted alphabetically based on the "name" property.-->
+    <policy name="ConfigureAllDevHomeEnabledState" class="Both" displayName="$(string.ConfigureAllDevHomeEnabledState)" explainText="$(string.ConfigureAllDevHomeEnabledStateDescription)" key="Software\Policies\DevHome" valueName="ConfigureEnabledDevHome">
+      <parentCategory ref="DevHome" />
+      <supportedOn ref="SUPPORTED_DEVHOME_0_1901" />
+      <enabledValue>
+        <decimal value="1" />
+      </enabledValue>
+      <disabledValue>
+        <decimal value="0" />
+      </disabledValue>
+    </policy>
+  </policies>
+</policyDefinitions>

src/gpo/assets/en-US/DevHome.adml

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) Microsoft Corporation.
+     Licensed under the MIT License. -->
+<policyDefinitionResources xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" revision="0.1900" schemaVersion="1.0" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
+  <displayName>Dev Home</displayName>
+  <description>Dev Home</description>
+  <resources>
+    <stringTable>
+      <string id="DevHome">Microsoft Dev Home</string>
+
+      <string id="SUPPORTED_DEVHOME_0_1900">Dev Home version 0.1900.* or later</string>
+
+      <string id="ConfigureAllDevHomeEnabledStateDescription">This policy configures the enabled state for Dev Home.
+
+If you enable this setting, Dev Home will be always enabled and the user won't be able to disable it.
+
+If you disable this setting, Dev Home will be always disabled and the user won't be able to enable it.
+
+If you don't configure this setting, users are able to enable or disable Dev Home.
+
+This policy will override any enabled state policies for individual Dev Home features.
+</string>
+
+      <string id="ConfigureAllDevHomeEnabledState">Configure Dev Home enabled state</string>
+    </stringTable>
+
+  </resources>
+</policyDefinitionResources>
+