Added support for usage of reserved powershell variables in commands [$null, $true, $false]

Author: nestor-fedyk-wpp

README.md

@@ -57,6 +57,9 @@ Three sets of init commands are availiable as of version `1.1.0`:
 ### <a id="history"></a>History
 
 ```
+v1.1.2 - 2022-07-06
+    - Added support for usage of reserved powershell variables in commands [$null, $true, $false]
+
 v1.1.1 - 2020-12-07
     - Fixed bug import of custom commands if provided for certificate based auth
 

package.json

@@ -1,6 +1,6 @@
 {
     "name": "powershell-command-executor",
-    "version": "1.1.1",
+    "version": "1.1.2",
     "description": "Provides a registry and gateway for execution powershell commands through long-lived established remote PSSessions via a stateful-process-command-proxy pool of powershell processes",
     "main": "psCommandService.js",
     "directories": {

psCommandService.js

@@ -3,6 +3,12 @@ module.exports = PSCommandService;
 var Promise = require('promise');
 var Mustache = require('mustache');
 
+/**
+ * Reserved variables in Powershell to allow as arguments
+ * @see https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_automatic_variables?view=powershell-7.2
+ */
+const reservedVariableNames = ['$null', '$false', '$true'];
+
 /**
 * PSCommandService
 *
@@ -366,6 +372,9 @@ PSCommandService.prototype._sanitize = function(toSanitize,isQuoted) {
     if (isQuoted) {
         toSanitize = toSanitize.replace(/(['])/g, "'$1");
 
+    // skip if this is reserved variable name
+    } else if (reservedVariableNames.includes(toSanitize)) {
+      // skip it
     // if not quoted, stop $ and |
     } else {
         toSanitize = toSanitize.replace(/([;\$\|\(\)\{\}\[\]\\])/g, "`$1");