[release/v7.6.7] Add GetImportModuleCommand method and session restriction check in ShowCommand (#28088)

Co-authored-by: Travis Plunk <travis.plunk@microsoft.com>

src/Microsoft.Management.UI.Internal/commandHelpers/ShowCommandHelper.cs

@@ -489,6 +489,37 @@ Function PSGetSerializedShowCommandInfo
                 @"Remove-Item -Path 'function:\PSGetSerializedShowCommandInfo' -Force");
         }
 
+        /// <summary>
+        /// Gets the command to be run to in order to import a module and refresh the command data.
+        /// </summary>
+        /// <param name="module">Module we want to import.</param>
+        /// <param name="isRemoteRunspace">Boolean flag determining whether Show-Command is queried in the local or remote runspace scenario.</param>
+        /// <param name="isFirstChance">Boolean flag to indicate that it is the second attempt to query Show-Command data.</param>
+        /// <returns>The command to be run to in order to import a module and refresh the command data.</returns>
+        internal static string GetImportModuleCommand(string module, bool isRemoteRunspace = false, bool isFirstChance = true)
+        {
+            string scriptBase = "Import-Module " + ShowCommandHelper.SingleQuote(module);
+
+            if (isRemoteRunspace)
+            {
+                if (isFirstChance)
+                {
+                    scriptBase += ";@(Get-Command " + ShowCommandHelper.CommandTypeSegment + @" -ShowCommandInfo )";
+                }
+                else
+                {
+                    scriptBase += GetSerializedCommandScript();
+                }
+            }
+            else
+            {
+                scriptBase += ";@(Get-Command " + ShowCommandHelper.CommandTypeSegment + ")";
+            }
+
+            scriptBase += ShowCommandHelper.GetGetModuleSuffix();
+            return scriptBase;
+        }
+
         /// <summary>
         /// Gets the command to be run in order to show help for a command.
         /// </summary>

src/Microsoft.PowerShell.Commands.Utility/commands/utility/ShowCommand/ShowCommand.cs

@@ -170,6 +170,13 @@ namespace Microsoft.PowerShell.Commands
         /// </summary>
         protected override void BeginProcessing()
         {
+            if (Utils.IsSessionRestricted(this.Context))
+            {
+                Exception e = new InvalidOperationException(HelpErrors.NotAllowedInRestrictedRemoting);
+                ErrorRecord errorRecord = new ErrorRecord(e, "CommandNotAllowed", ErrorCategory.InvalidOperation, null);
+                this.ThrowTerminatingError(errorRecord);
+            }
+
             _showCommandProxy = new ShowCommandProxy(this);
 
             if (_showCommandProxy.ScreenHeight < this.Height)

src/System.Management.Automation/resources/HelpErrors.resx

@@ -190,4 +190,7 @@ To update these Help topics, start PowerShell by using the "Run as Administrator
   <data name="NoNetworkCommands" xml:space="preserve">
     <value>Cannot get help from a network location when in a restricted session.</value>
   </data>
+  <data name="NotAllowedInRestrictedRemoting" xml:space="preserve">
+    <value>Command not allowed in a restricted session.</value>
+  </data>
 </root>