Bug 1691526 - Enable 'os' level targeting for Nimbus Experiment r=k88hudson

Differential Revision: https://phabricator.services.mozilla.com/D104545

Author: piatra

toolkit/components/messaging-system/targeting/Targeting.jsm

@@ -15,6 +15,8 @@ XPCOMUtils.defineLazyModuleGetters(this, {
   FilterExpressions:
     "resource://gre/modules/components-utils/FilterExpressions.jsm",
   ClientEnvironment: "resource://normandy/lib/ClientEnvironment.jsm",
+  ClientEnvironmentBase:
+    "resource://gre/modules/components-utils/ClientEnvironment.jsm",
   AppConstants: "resource://gre/modules/AppConstants.jsm",
 });
 
@@ -56,6 +58,10 @@ const TargetingEnvironment = {
   get platform() {
     return AppConstants.platform;
   },
+
+  get os() {
+    return ClientEnvironmentBase.os;
+  },
 };
 
 class TargetingContext {

toolkit/components/messaging-system/targeting/test/unit/test_targeting.js

@@ -243,3 +243,15 @@ add_task(async function test_default_targeting() {
     );
   }
 });
+
+add_task(async function test_targeting_os() {
+  const targeting = new TargetingContext();
+  let res = await targeting.eval(
+    "ctx.os.isWindows || ctx.os.isMac || ctx.os.isLinux"
+  );
+  Assert.ok(res, `Should detect a platform got: ${res}`);
+  res = await targeting.eval(
+    "(ctx.os.windowsVersion && ctx.os.windowsBuildNumber) || ctx.os.macVersion || ctx.os.darwinVersion"
+  );
+  Assert.ok(res, `Should detect platform version got: ${res}`);
+});