fix: ensure role members endpoint only returns the ids instead of objects

Author: Neunerlei

src/main/java/com/hawk/keycloak/ApiRoot.java

@@ -158,7 +158,7 @@ public Stream<RoleRepresentation> getRoles(
     @GET
     @Path("roles/{role}/members")
     @Produces(MediaType.APPLICATION_JSON)
-    public Stream<Map<String, String>> getRoleMembers(
+    public Stream<String> getRoleMembers(
             @Parameter(description = "The id of the role to find the members of") @PathParam("role") String roleId,
             @Parameter(description = "Pagination offset") @QueryParam("first") Integer firstResult,
             @Parameter(description = "Maximum results size (defaults to 100)") @QueryParam("max") Integer maxResults

src/main/java/com/hawk/keycloak/roles/RolesRequestHandler.java

@@ -8,6 +8,7 @@
 import org.keycloak.models.KeycloakSession;
 import org.keycloak.models.RealmModel;
 import org.keycloak.models.RoleModel;
+import org.keycloak.models.UserModel;
 import org.keycloak.models.utils.ModelToRepresentation;
 import org.keycloak.representations.idm.RoleRepresentation;
 
@@ -47,7 +48,7 @@ public Stream<RoleRepresentation> handleRolesRequest(
 
     }
 
-    public Stream<Map<String, String>> handleRoleMembersRequest(
+    public Stream<String> handleRoleMembersRequest(
             String roleId,
             Integer firstResult,
             Integer maxResults
@@ -70,6 +71,6 @@ public Stream<Map<String, String>> handleRoleMembersRequest(
         }
 
         return session.users().getRoleMembersStream(realm, roleModel, firstResult, maxResults)
-                .map(m -> Map.of("id", m.getId()));
+                .map(UserModel::getId);
     }
 }