From aa122113ade36f02dc8fdbebdf1232b5c4b8742c Mon Sep 17 00:00:00 2001
From: Kamal Wickramanayake <kamal@inbox.lk>
Date: Fri, 3 Jul 2026 19:02:36 +0530
Subject: Microservice sample projects

---
 .../security/controllers/UserRestController.java   | 36 ++++++++++++++++++++++
 .../apigateway/security/dto/UserResonseDto.java    | 16 ++++++++++
 2 files changed, 52 insertions(+)
 create mode 100644 microservices/02-api-gateway/src/main/java/com/example/apigateway/security/controllers/UserRestController.java
 create mode 100644 microservices/02-api-gateway/src/main/java/com/example/apigateway/security/dto/UserResonseDto.java

(limited to 'microservices/02-api-gateway/src/main/java/com/example/apigateway/security')

diff --git a/microservices/02-api-gateway/src/main/java/com/example/apigateway/security/controllers/UserRestController.java b/microservices/02-api-gateway/src/main/java/com/example/apigateway/security/controllers/UserRestController.java
new file mode 100644
index 0000000..5d6581c
--- /dev/null
+++ b/microservices/02-api-gateway/src/main/java/com/example/apigateway/security/controllers/UserRestController.java
@@ -0,0 +1,36 @@
+package com.example.apigateway.security.controllers;
+
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.security.oauth2.core.user.OAuth2User;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import reactor.core.publisher.Mono;
+
+@RestController
+public class UserRestController {
+
+    @GetMapping("/api/security/me")
+    public Mono<Map<String, Object>> getLoggedInUser(@AuthenticationPrincipal OAuth2User principal) {
+        if (principal == null) {
+            return Mono.just(Map.of());
+        }
+
+        // Filter roles starting with "ROLE_"
+        List<String> roles = principal.getAuthorities().stream()
+                .map(grantedAuthority -> grantedAuthority.getAuthority())
+                .filter(authority -> authority.startsWith("ROLE_"))
+                .map(s -> s.substring(5)) // Cut ROLE_ part
+                .collect(Collectors.toList());
+
+        return Mono.just(Map.of(
+                "username", principal.getAttribute("sub"),
+                // "name", principal.getName(),
+                // "email", principal.getEmail(),
+                "roles", roles));
+    }
+}
diff --git a/microservices/02-api-gateway/src/main/java/com/example/apigateway/security/dto/UserResonseDto.java b/microservices/02-api-gateway/src/main/java/com/example/apigateway/security/dto/UserResonseDto.java
new file mode 100644
index 0000000..d553d9a
--- /dev/null
+++ b/microservices/02-api-gateway/src/main/java/com/example/apigateway/security/dto/UserResonseDto.java
@@ -0,0 +1,16 @@
+package com.example.apigateway.security.dto;
+
+import java.util.List;
+
+public class UserResonseDto {
+    private List<String> roles;
+
+    // Getters and Setters
+    public List<String> getRoles() {
+        return roles;
+    }
+
+    public void setRoles(List<String> roles) {
+        this.roles = roles;
+    }
+}
-- 
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