defineContext now requires an existing user name or null to create a new user

src/main/java/net/hostsharing/hsadminng/rbac/rbacuser/RbacUserController.java

@@ -30,7 +30,7 @@ public class RbacUserController implements RbacusersApi {
     public ResponseEntity<RbacUserResource> createUser(
             final RbacUserResource body
     ) {
-        context.define(body.getName());
+        context.define(null);
 
         if (body.getUuid() == null) {
             body.setUuid(UUID.randomUUID());

src/main/resources/db/changelog/054-rbac-context.sql

@@ -17,8 +17,9 @@ begin
     end if;
 
     select uuid from RbacUser where name = currentUser into currentUserUuid;
-    -- TODO: maybe this should be changed, and in this case no user name defined in context?
-    -- no exception if user does not exist because users can register themselves
+    if currentUserUuid is null then
+        raise exception '[401] user % given in `defineContext(...)` does not exist', currentUser;
+    end if;
     return currentUserUuid;
 end; $$;
 
@@ -166,7 +167,7 @@ begin
         if (length(currentUserName) > 0) then
             raise exception '[401] currentSubjectsUuids (%) cannot be determined, unknown user name "%"', currentSubjectsUuids, currentUserName;
         else
-            raise exception '[401] currentSubjectsUuids cannot be determined, please call `defineContext(...)` first;"';
+            raise exception '[401] currentSubjectsUuids cannot be determined, please call `defineContext(...)` with a valid user;"';
         end if;
     end if;
     return string_to_array(currentSubjectsUuids, ';');

src/test/java/net/hostsharing/hsadminng/context/ContextIntegrationTests.java

@@ -69,16 +69,16 @@ class ContextIntegrationTests {
     }
 
     @Test
-    void defineWithUnknownCurrentUserButWithAssumedRoles() {
+    void defineWithUnknownCurrentUser() {
         // when
         final var result = jpaAttempt.transacted(() ->
-                context.define("unknown@example.org", "test_package#yyy00.admin")
+                context.define("unknown@example.org")
         );
 
         // then
         result.assertExceptionWithRootCauseMessage(
                 javax.persistence.PersistenceException.class,
-                "ERROR: [403] undefined has no permission to assume role test_package#yyy00.admin");
+                "[401] user unknown@example.org given in `defineContext(...)` does not exist");
     }
 
     @Test

src/test/java/net/hostsharing/hsadminng/rbac/rbacgrant/RbacGrantControllerAcceptanceTest.java

@@ -492,7 +492,7 @@ class RbacGrantControllerAcceptanceTest extends ContextBasedTest {
     RbacUserEntity createRBacUser() {
         return jpaAttempt.transacted(() -> {
             final String newUserName = "test-user-" + RandomStringUtils.randomAlphabetic(8) + "@example.com";
-            context(newUserName, null);
+            context(null);
             return rbacUserRepository.create(new RbacUserEntity(UUID.randomUUID(), newUserName));
         }).returnedValue();
     }

src/test/java/net/hostsharing/hsadminng/rbac/rbacgrant/RbacGrantRepositoryIntegrationTest.java

@@ -300,7 +300,7 @@ class RbacGrantRepositoryIntegrationTest extends ContextBasedTest {
     private RbacUserEntity createNewUserTransacted() {
         return jpaAttempt.transacted(() -> {
             final var newUserName = "test-user-" + System.currentTimeMillis() + "@example.com";
-            context(newUserName);
+            context(null);
             return rbacUserRepository.create(new RbacUserEntity(null, newUserName));
         }).assumeSuccessful().returnedValue();
     }

src/test/java/net/hostsharing/hsadminng/rbac/rbacrole/RbacRoleRepositoryIntegrationTest.java

@@ -138,8 +138,8 @@ class RbacRoleRepositoryIntegrationTest {
         }
 
         @Test
-        void unknownUser_withoutAssumedRole_cannotViewAnyRbacRoles() {
-            context.define("unknown@example.org");
+        void anonymousUser_withoutAssumedRole_cannotViewAnyRbacRoles() {
+            context.define(null);
 
             final var result = attempt(
                     em,
@@ -147,7 +147,7 @@ class RbacRoleRepositoryIntegrationTest {
 
             result.assertExceptionWithRootCauseMessage(
                     JpaSystemException.class,
-                    "[401] currentSubjectsUuids () cannot be determined, unknown user name \"unknown@example.org\"");
+                    "[401] currentSubjectsUuids cannot be determined, please call `defineContext(...)` with a valid user");
         }
     }
 

src/test/java/net/hostsharing/hsadminng/rbac/rbacuser/RbacUserRepositoryIntegrationTest.java

@@ -47,7 +47,7 @@ class RbacUserRepositoryIntegrationTest extends ContextBasedTest {
         public void anyoneCanCreateTheirOwnUser() {
             // given
             final var givenNewUserName = "test-user-" + System.currentTimeMillis() + "@example.com";
-            context(givenNewUserName, null);
+            context(null);
 
             // when
             final var result = rbacUserRepository.create(