Microservice sample projects

1 files changed, 71 insertions, 0 deletions

diff --git a/microservices/03-resource-server/src/main/java/com/example/resourceserver/security/UserRestController.java b/microservices/03-resource-server/src/main/java/com/example/resourceserver/security/UserRestController.java
new file mode 100644
index 0000000..0eb0d51
--- /dev/null
+++ b/microservices/03-resource-server/src/main/java/com/example/resourceserver/security/UserRestController.java
@@ -0,0 +1,71 @@
+package com.example.resourceserver.security;
+
+import java.security.Principal;
+import java.util.Collection;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.GrantedAuthority;
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.security.oauth2.jwt.Jwt;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestHeader;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/api/security/users")
+public class UserRestController {
+    private UserService userService;
+
+    public UserRestController(UserService userService) {
+        this.userService = userService;
+    }
+
+    @GetMapping("/{username}/roles")
+    public ResponseEntity<RolesResponse> getRoles(@PathVariable String username) {
+        Optional<User> user = userService.findByUsername(username);
+
+        if (user.isEmpty()) {
+            return ResponseEntity.ok(new RolesResponse(Set.of()));
+        }
+
+        return ResponseEntity.ok(new RolesResponse(user.get().getRoles()));
+    }
+
+    @GetMapping("/test")
+    public String test(Principal principal) {
+        return principal.toString();
+    }
+
+    @GetMapping("/test-username")
+    public String testName(Principal principal) {
+        return principal.getName();
+    }
+
+    // Get roles using the Authentication object
+    @GetMapping("/test-roles-auth")
+    public Collection<String> getRoles(Authentication authentication) {
+        return authentication.getAuthorities().stream()
+                .map(GrantedAuthority::getAuthority)
+                .collect(Collectors.toList());
+    }
+
+    // Inspect raw JWT claims directly
+    @GetMapping("/test-roles-jwt")
+    public Map<String, Object> getClaims(@AuthenticationPrincipal Jwt jwt) {
+        return jwt.getClaims(); // Extract custom JSON fields containing roles
+    }
+
+    /* Not very secure because unverifiable headers can be introduced by unwanted parties */
+    @GetMapping("/test-roles-headers")
+    public String getRolesFromHeaders(@RequestHeader("X-User-Name") String username,
+            @RequestHeader("X-User-Roles") String roles) {
+        return "Roles: " + roles + ", username: " + username ;
+    }
+}