Add telemetry to identify internal users (#463)

* Add telemetry to identify internal users

src/common/constants.ts

@@ -174,6 +174,8 @@ export class Constants {
     public static openSampleEvent = "openSample";
     public static openSampleUrlEvent = "openSampleUrl";
 
+    public static isInternalPropertyName = "isInternal";
+
     public static subModuleKeyPrefixTemplate(name: string): string {
         return `MODULES.${name}`;
     }

src/common/telemetryClient.ts

@@ -12,8 +12,22 @@ const aiKey: string = packageJSON.aiKey;
 
 export class TelemetryClient {
     public static sendEvent(eventName: string, properties?: { [key: string]: string; }): void {
+        if (properties) {
+            properties[Constants.isInternalPropertyName] = this._isInternal === true ? "true" : "false";
+        } else {
+            properties = {
+                [Constants.isInternalPropertyName] : this._isInternal === true ? "true" : "false",
+            };
+        }
         this._client.sendTelemetryEvent(eventName, properties);
     }
 
+    private static _isInternal: boolean = TelemetryClient.isInternalUser();
+
     private static _client = new TelemetryReporter(Constants.ExtensionId, extensionVersion, aiKey);
+
+    private static isInternalUser(): boolean {
+        const userDomain = process.env.USERDNSDOMAIN ? process.env.USERDNSDOMAIN.toLowerCase() : "";
+        return userDomain.endsWith("microsoft.com");
+    }
 }