Merge pull request #12162 from hmdrzsharifi/bael-5249

Bael 5249: Get Keycloak User ID in Spring

spring-boot-modules/spring-boot-keycloak/src/main/java/com/baeldung/keycloak/CustomUserAttrController.java

@@ -24,6 +24,8 @@ public class CustomUserAttrController {
         final Principal principal = (Principal) authentication.getPrincipal();
 
         String dob = "";
+        String userIdByToken = "";
+        String userIdByMapper = "";
 
         if (principal instanceof KeycloakPrincipal) {
 
@@ -31,6 +33,9 @@ public class CustomUserAttrController {
             IDToken token = kPrincipal.getKeycloakSecurityContext()
                 .getIdToken();
 
+            userIdByToken = token.getSubject();
+            userIdByMapper = token.getOtherClaims().get("user_id").toString();
+
             Map<String, Object> customClaims = token.getOtherClaims();
 
             if (customClaims.containsKey("DOB")) {
@@ -39,6 +44,8 @@ public class CustomUserAttrController {
         }
 
         model.addAttribute("username", principal.getName());
+        model.addAttribute("userIDByToken", userIdByToken);
+        model.addAttribute("userIDByMapper", userIdByMapper);
         model.addAttribute("dob", dob);
         return "userInfo";
     }

spring-boot-modules/spring-boot-keycloak/src/main/resources/application-embedded.properties

@@ -0,0 +1,9 @@
+### server port
+server.port=8080
+
+#Keycloak Configuration
+keycloak.auth-server-url=http://localhost:8083/auth
+keycloak.realm=baeldung
+keycloak.resource=customerClient
+keycloak.public-client=true
+keycloak.principal-attribute=preferred_username

spring-boot-modules/spring-boot-keycloak/src/main/resources/templates/userInfo.html

@@ -7,6 +7,12 @@
 		<h1>
 			Hello, <span th:text="${username}">--name--</span>.
 		</h1>
+		<h1>
+			User ID By Token: <span th:text="${userIDByToken}">--userID--</span>.
+		</h1>
+		<h1>
+			User ID By Mapper: <span th:text="${userIDByMapper}">--userID--</span>.
+		</h1>
 		<h3>
 			Your Date of Birth as per our records is <span th:text="${dob}" />.
 		</h3>