added /api/username

dashboard-web-app/src/main/java/org/inventory/hub/controller/SecurityController.java

@@ -0,0 +1,37 @@
+/**
+ * Copyright (c) Microsoft Corporation. All rights reserved.
+ * Licensed under the MIT License. See LICENSE in the project root for
+ * license information.
+ */
+
+package org.inventory.hub.controller;
+
+import java.security.Principal;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.ResponseBody;
+
+@Controller
+@ResponseBody
+public class SecurityController {
+
+    public SecurityController() {
+    }
+
+    @RequestMapping(value = "/api/username", method = RequestMethod.GET)
+    public String currentUsername(final Principal principal) {
+
+        System.out.println("======= /api/username ===== ");
+        String username = new String();
+        if (principal != null)
+                username = principal.getName();
+
+        System.out.println("username=" + username);
+        System.out.println("====== success");
+
+        return username;
+    }
+
+}