VPN-6473 check for OS (#9689)

addons/message_update_v2.23/manifest.json

@@ -4,7 +4,8 @@
   "name": "Update to Mozilla VPN 2.23",
   "type": "message",
   "conditions": {
-    "max_client_version": "2.22.9"
+    "max_client_version": "2.22.9",
+    "javascript": "osCheck.js"
   },
   "javascript": {
     "enable": "enable.js"

addons/message_update_v2.23/osCheck.js

@@ -0,0 +1,23 @@
+// Disable on iOS 13 and earlier
+(function(api, condition) {
+  // First check for iOS...
+  const isIOS = (api.env.platform === "ios");
+  if (!isIOS) {
+    condition.enable();
+    return;
+  }
+
+  // ...then check for iOS 14 or later
+  const minVersion = 14;
+  const osVersion = api.env.osVersion;
+  if (!osVersion || (typeof osVersion !== "string") || osVersion.length === 0) {
+    // Something unexpected happened. Enable on failure.
+    condition.enable();
+    return;
+  }
+  const majorVersionString = osVersion.split(".", 1)[0];
+  const majorVersion = Number(majorVersionString);
+
+  majorVersion >= minVersion ? condition.enable() : condition.disable();
+});
+