add RbacUser* tests and improved http status codes

src/main/java/net/hostsharing/hsadminng/errors/RestResponseEntityExceptionHandler.java

@@ -13,6 +13,7 @@ import org.springframework.web.context.request.WebRequest;
 import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler;
 
 import java.time.LocalDateTime;
+import java.util.Optional;
 
 @ControllerAdvice
 public class RestResponseEntityExceptionHandler
@@ -22,16 +23,39 @@ public class RestResponseEntityExceptionHandler
     protected ResponseEntity<CustomErrorResponse> handleConflict(
         final RuntimeException exc, final WebRequest request) {
 
-        return new ResponseEntity<>(
+        final var message = firstLine(NestedExceptionUtils.getMostSpecificCause(exc).getMessage());
-            new CustomErrorResponse(request.getContextPath(), exc, HttpStatus.CONFLICT), HttpStatus.CONFLICT);
+        return errorResponse(request, HttpStatus.CONFLICT, message);
     }
 
     @ExceptionHandler(JpaSystemException.class)
     protected ResponseEntity<CustomErrorResponse> handleJpaExceptions(
         final RuntimeException exc, final WebRequest request) {
+        final var message = firstLine(NestedExceptionUtils.getMostSpecificCause(exc).getMessage());
+        return errorResponse(request, httpStatus(message).orElse(HttpStatus.FORBIDDEN), message);
+    }
 
+    private Optional<HttpStatus> httpStatus(final String message) {
+        if (message.startsWith("ERROR: [")) {
+            for (HttpStatus status : HttpStatus.values()) {
+                if (message.startsWith("ERROR: [" + status.value() + "]")) {
+                    return Optional.of(status);
+                }
+            }
+            return Optional.of(HttpStatus.INTERNAL_SERVER_ERROR);
+        }
+        return Optional.empty();
+    }
+
+    private static ResponseEntity<CustomErrorResponse> errorResponse(
+        final WebRequest request,
+        final HttpStatus conflict,
+        final String message) {
         return new ResponseEntity<>(
-            new CustomErrorResponse(request.getContextPath(), exc, HttpStatus.FORBIDDEN), HttpStatus.FORBIDDEN);
+            new CustomErrorResponse(request.getContextPath(), conflict, message), conflict);
+    }
+
+    private String firstLine(final String message) {
+        return message.split("\\r|\\n|\\r\\n", 0)[0];
     }
 }
 
@@ -49,15 +73,11 @@ class CustomErrorResponse {
 
     private final String message;
 
-    public CustomErrorResponse(final String path, final RuntimeException exc, final HttpStatus status) {
+    public CustomErrorResponse(final String path, final HttpStatus status, final String message) {
         this.timestamp = LocalDateTime.now();
         this.path = path;
         this.status = status.value();
         this.error = status.getReasonPhrase();
-        this.message = firstLine(NestedExceptionUtils.getMostSpecificCause(exc).getMessage());
+        this.message = message;
-    }
-
-    private String firstLine(final String message) {
-        return message.split("\\r|\\n|\\r\\n", 0)[0];
     }
 }

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

@@ -1,11 +1,16 @@
 package net.hostsharing.hsadminng.rbac.rbacuser;
 
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.media.ArraySchema;
+import io.swagger.v3.oas.annotations.media.Content;
+import io.swagger.v3.oas.annotations.media.Schema;
+import io.swagger.v3.oas.annotations.responses.ApiResponse;
 import net.hostsharing.hsadminng.context.Context;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.web.bind.annotation.*;
 
 import javax.transaction.Transactional;
-import java.util.ArrayList;
+import java.util.List;
 
 @RestController
 public class RbacUserController {
@@ -16,9 +21,18 @@ public class RbacUserController {
     @Autowired
     private RbacUserRepository rbacUserRepository;
 
-    @GetMapping(value = "/api/rbacuser")
+    @GetMapping(value = "/api/rbacusers")
+    @Operation(description = "List accessible RBAC users with optional filter by name.",
+        responses = {
+            @ApiResponse(responseCode = "200",
+                content = @Content(array = @ArraySchema(
+                    schema = @Schema(implementation = RbacUserEntity.class)))),
+            @ApiResponse(responseCode = "401",
+                description = "if the 'current-user' cannot be identified"),
+            @ApiResponse(responseCode = "403",
+                description = "if the 'current-user' is not allowed to assume any of the roles from 'assumed-roles'") })
     @Transactional
-    public Iterable<RbacUserEntity> listUsers(
+    public List<RbacUserEntity> listUsers(
         @RequestHeader(name = "current-user") String currentUserName,
         @RequestHeader(name = "assumed-roles", required = false) String assumedRoles,
         @RequestParam(name="name", required = false) String userName
@@ -31,8 +45,15 @@ public class RbacUserController {
     }
 
     @GetMapping(value = "/api/rbacuser/{userName}/permissions")
+    @Operation(description = "List all visible permissions granted to the given user; reduced ", responses = {
+        @ApiResponse(responseCode = "200",
+            content = @Content(array = @ArraySchema( schema = @Schema(implementation = RbacUserPermission.class)))),
+        @ApiResponse(responseCode = "401",
+            description = "if the 'current-user' cannot be identified"),
+        @ApiResponse(responseCode = "403",
+            description = "if the 'current-user' is not allowed to view permissions of the given user") })
     @Transactional
-    public Iterable<RbacUserPermission> listUserPermissions(
+    public List<RbacUserPermission> listUserPermissions(
         @RequestHeader(name = "current-user") String currentUserName,
         @RequestHeader(name = "assumed-roles", required = false) String assumedRoles,
         @PathVariable(name= "userName") String userName

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

@@ -14,30 +14,6 @@ import java.util.UUID;
 @Immutable
 @NoArgsConstructor
 @AllArgsConstructor
-//@SqlResultSetMapping(
-//    name = "rbacUserPermissionMapping",
-//    classes = {
-//        @ConstructorResult(
-//            targetClass = RbacUserPermission.class,
-//            columns = {
-//                @ColumnResult(name = "roleUuid", type = UUID.class),
-//                @ColumnResult(name = "oleName", type = String.class),
-//                @ColumnResult(name = "permissionUuid", type = UUID.class),
-//                @ColumnResult(name = "op", type=String.class),
-//                @ColumnResult(name = "objectTable", type=String.class),
-//                @ColumnResult(name = "objectIdName", type =String.class),
-//                @ColumnResult(name = "objectUuid", type = UUID.class),
-//                @ColumnResult(name = "campId", type = Integer.class),
-//                @ColumnResult(name = "userCount", type = Byte.class)
-//            }
-//        )
-//    }
-//)
-//@NamedNativeQuery(
-//    name = "grantedPermissions",
-//    query = "SELECT * FROM grantedPermissions(:userName)",
-//    resultSetMapping = "rbacUserPermissionMapping"
-//)
 public class RbacUserEntity {
 
     @Id

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

@@ -13,5 +13,5 @@ public interface RbacUserRepository extends Repository<RbacUserEntity, UUID> {
     List<RbacUserEntity> findByOptionalNameLike(final String userName);
 
     @Query(value = "SELECT * FROM grantedPermissions(:userName)", nativeQuery = true)
-    Iterable<RbacUserPermission> findPermissionsOfUser(@Param("userName") String userName);
+    List<RbacUserPermission> findPermissionsOfUser(@Param("userName") String userName);
 }

src/main/resources/db/changelog/2022-07-28-005-rbac-base.sql

@@ -391,6 +391,19 @@ select exists(
            );
 $$;
 
+create or replace function hasGlobalRoleGranted(userUuid uuid)
+    returns bool
+    stable leakproof
+    language sql as $$
+select exists(
+           select r.uuid
+                from RbacGrants as g
+                join RbacRole as r on r.uuid = g.descendantuuid
+                join RbacObject as o on o.uuid = r.objectuuid
+                where g.ascendantuuid = userUuid and o.objecttable = 'global'
+           );
+$$;
+
 create or replace procedure grantPermissionsToRole(roleUuid uuid, permissionIds uuid[])
     language plpgsql as $$
 begin
@@ -417,7 +430,7 @@ begin
     perform assertReferenceType('subRoleId (descendant)', subRoleId, 'RbacRole');
 
     if (isGranted(subRoleId, superRoleId)) then
-        raise exception 'Cyclic role grant detected between % and %', subRoleId, superRoleId;
+        raise exception '[400] Cyclic role grant detected between % and %', subRoleId, superRoleId;
     end if;
 
     insert
@@ -487,7 +500,7 @@ begin
 
     foundRows = lastRowCount();
     if foundRows > maxObjects then
-        raise exception 'Too many accessible objects, limit is %, found %.', maxObjects, foundRows
+        raise exception '[400] Too many accessible objects, limit is %, found %.', maxObjects, foundRows
             using
                 errcode = 'P0003',
                 hint = 'Please assume a sub-role and try again.';

src/main/resources/db/changelog/2022-07-28-006-rbac-current.sql

@@ -21,7 +21,7 @@ begin
             currentUser := null;
     end;
     if (currentUser is null or currentUser = '') then
-        raise exception 'hsadminng.currentUser must be defined, please use "SET LOCAL ...;"';
+        raise exception '[401] hsadminng.currentUser must be defined, please use "SET LOCAL ...;"';
     end if;
     return currentUser;
 end; $$;
@@ -37,7 +37,7 @@ begin
     currentUser := currentUser();
     currentUserId = (select uuid from RbacUser where name = currentUser);
     if currentUserId is null then
-        raise exception 'hsadminng.currentUser defined as %, but does not exists', currentUser;
+        raise exception '[401] hsadminng.currentUser defined as %, but does not exists', currentUser;
     end if;
     return currentUserId;
 end; $$;
@@ -150,7 +150,7 @@ declare
 begin
     currentUserId := currentUserId();
     if currentUserId is null then
-        raise exception 'user % does not exist', currentUser();
+        raise exception '[401] user % does not exist', currentUser();
     end if;
 
     roleNames := assumedRoles();
@@ -176,7 +176,7 @@ begin
                   and r.roleType = roleTypeToAssume
                 into roleUuidToAssume;
             if (not isGranted(currentUserId, roleUuidToAssume)) then
-                raise exception 'user % (%) has no permission to assume role % (%)', currentUser(), currentUserId, roleName, roleUuidToAssume;
+                raise exception '[403] user % (%) has no permission to assume role % (%)', currentUser(), currentUserId, roleName, roleUuidToAssume;
             end if;
             roleIdsToAssume := roleIdsToAssume || roleUuidToAssume;
         end loop;

src/main/resources/db/changelog/2022-07-28-007-rbac-views.sql

@@ -61,31 +61,45 @@ grant all privileges on RbacOwnGrantedPermissions_rv to restricted;
 /*
     Returns all permissions granted to the given user,
     which are also visible to the current user or assumed roles.
+
+
  */
 create or replace function grantedPermissions(userName varchar)
     returns table(roleUuid uuid, roleName text, permissionUuid uuid, op RbacOp, objectTable varchar, objectIdName varchar, objectUuid uuid)
     returns null on null input
     language plpgsql as $$
+declare
+    targetUserId uuid;
+    currentUserId uuid;
 begin
     -- @formatter:off
     if cardinality(assumedRoles()) > 0 then
-        raise exception 'grantedPermissions(...) does not support assumed roles';
+        raise exception '[400] grantedPermissions(...) does not support assumed roles';
+    end if;
+
+    targetUserId := findRbacUserId(userName);
+    currentUserId := currentUserId();
+
+    if hasGlobalRoleGranted(targetUserId) and not hasGlobalRoleGranted(currentUserId) then
+        raise exception '[403] permissions of user "%" are not accessible to user "%"', userName, currentUser();
     end if;
 
     return query select
         xp.roleUuid,
-        (xp.objecttable || '#' || xp.objectidname || '.' || xp.roletype) as roleName,
+        (xp.roleObjectTable || '#' || xp.roleObjectIdName || '.' || xp.roleType) as roleName,
-        xp.permissionUuid, xp.op, xp.objecttable, xp.objectIdName, xp.objectuuid
+        xp.permissionUuid, xp.op, xp.permissionObjectTable, xp.permissionObjectIdName, xp.permissionObjectUuid
         from (select
-                  r.uuid as roleUuid, r.roletype,
+                  r.uuid as roleUuid, r.roletype, ro.objectTable as roleObjectTable,
-                  p.uuid as permissionUuid, p.op, o.objecttable,
+                  findIdNameByObjectUuid(ro.objectTable, ro.uuid) as roleObjectIdName,
-                  findIdNameByObjectUuid(o.objectTable, o.uuid) as objectIdName,
+                  p.uuid as permissionUuid, p.op, po.objecttable as permissionObjectTable,
-                  o.uuid as objectuuid
+                  findIdNameByObjectUuid(po.objectTable, po.uuid) as permissionObjectIdName,
-                  from queryPermissionsGrantedToSubjectId( findRbacUserId(userName)) p
+                  po.uuid as permissionObjectUuid
-                           join rbacgrants g on g.descendantuuid = p.uuid
+              from queryPermissionsGrantedToSubjectId( targetUserId) as p
-                           join rbacobject o on o.uuid = p.objectuuid
+              join rbacgrants as g on g.descendantUuid = p.uuid
-                           join rbacrole r on r.uuid = g.ascendantuuid
+              join rbacobject as po on po.uuid = p.objectUuid
-                  where isGranted(currentUserId(), r.uuid)
+              join rbacrole_rv as r on r.uuid = g.ascendantUuid
+              join rbacobject as ro on ro.uuid = r.objectUuid
+              where isGranted(targetUserId, r.uuid)
              ) xp;
     -- @formatter:on
 end; $$;

src/main/resources/db/changelog/2022-07-29-061-hs-customer-rbac.sql

@@ -220,7 +220,7 @@ create or replace function addCustomerNotAllowedForCurrentSubjects()
     language PLPGSQL
 as $$
 begin
-    raise exception 'add-customer not permitted for %', array_to_string(currentSubjects(), ';', 'null');
+    raise exception '[403] add-customer not permitted for %', array_to_string(currentSubjects(), ';', 'null');
 end; $$;
 
 /**

src/main/resources/db/changelog/2022-07-29-070-hs-package-test-data.sql

@@ -16,6 +16,7 @@ create or replace procedure createPackageTestData(
         pacName         varchar;
         currentTask     varchar;
         custAdmin       varchar;
+        pac             package;
     begin
         set hsadminng.currentUser to '';
 
@@ -37,7 +38,13 @@ create or replace procedure createPackageTestData(
 
                         insert
                             into package (name, customerUuid)
-                            values (pacName, cust.uuid);
+                            values (pacName, cust.uuid)
+                            returning * into pac;
+
+                        call grantRoleToUser(
+                            findRoleId(packageAdmin(pac)),
+                            createRbacUser(pacName || '@' || cust.prefix || '.example.com'));
+
                     end loop;
             end loop;
 

src/test/java/net/hostsharing/hsadminng/hs/hscustomer/CustomerRepositoryIntegrationTest.java

@@ -159,7 +159,7 @@ class CustomerRepositoryIntegrationTest {
             // then
             attempt.assertExceptionWithRootCauseMessage(
                 JpaSystemException.class,
-                "user admin@aaa.example.com .* has no permission to assume role package#aab00#admin");
+                "[403] user admin@aaa.example.com", "has no permission to assume role package#aab00#admin");
         }
 
         @Test

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

@@ -1,6 +1,7 @@
 package net.hostsharing.hsadminng.rbac.rbacrole;
 
 import net.hostsharing.hsadminng.context.Context;
+import net.hostsharing.test.Array;
 import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -29,7 +30,7 @@ class RbacRoleRepositoryIntegrationTest {
     @Nested
     class FindAllRbacRoles {
 
-        private static final String[] ALL_TEST_DATA_ROLES = new String[] {
+        private static final String[] ALL_TEST_DATA_ROLES = Array.of(
             // @formatter:off
             "global#hostsharing.admin",
                 "customer#aaa.admin", "customer#aaa.owner", "customer#aaa.tenant",
@@ -45,7 +46,7 @@ class RbacRoleRepositoryIntegrationTest {
                     "package#aac01.admin", "package#aac01.owner", "package#aac01.tenant",
                     "package#aac02.admin", "package#aac02.owner", "package#aac02.tenant"
             // @formatter:on
-        };
+        );
 
         @Test
         public void hostsharingAdmin_withoutAssumedRole_canViewAllRbacRoles() {
@@ -116,7 +117,7 @@ class RbacRoleRepositoryIntegrationTest {
             // then
             attempt.assertExceptionWithRootCauseMessage(
                 JpaSystemException.class,
-                "user admin@aaa.example.com .* has no permission to assume role package#aab00#admin");
+                "[403] user admin@aaa.example.com", "has no permission to assume role package#aab00#admin");
         }
 
         @Test
@@ -159,11 +160,10 @@ class RbacRoleRepositoryIntegrationTest {
         assertThat(context.getAssumedRoles()).as("precondition").containsExactly(assumedRoles.split(";"));
     }
 
-    void exactlyTheseRbacRolesAreReturned(final Iterable<RbacRoleEntity> actualResult, final String... rbacRoleNames) {
+    void exactlyTheseRbacRolesAreReturned(final Iterable<RbacRoleEntity> actualResult, final String... expectedRoleNames) {
         assertThat(actualResult)
-            //.hasSize(rbacRoleNames.length)
             .extracting(RbacRoleEntity::getRoleName)
-            .containsExactlyInAnyOrder(rbacRoleNames);
+            .containsExactlyInAnyOrder(expectedRoleNames);
     }
 
 }

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

@@ -0,0 +1,72 @@
+package net.hostsharing.hsadminng.rbac.rbacuser;
+
+import net.hostsharing.hsadminng.context.Context;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.http.MediaType;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
+
+import java.util.List;
+
+import static net.hostsharing.hsadminng.rbac.rbacrole.TestRbacRole.*;
+import static net.hostsharing.hsadminng.rbac.rbacuser.TestRbacUser.userAaa;
+import static net.hostsharing.hsadminng.rbac.rbacuser.TestRbacUser.userBbb;
+import static org.hamcrest.Matchers.hasSize;
+import static org.hamcrest.Matchers.is;
+import static org.mockito.Mockito.when;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+@WebMvcTest(RbacUserController.class)
+class RbacUserControllerRestTest {
+
+    @Autowired
+    MockMvc mockMvc;
+    @MockBean
+    Context contextMock;
+    @MockBean
+    RbacUserRepository rbacUserRepository;
+
+    @Test
+    void willListAllUsers() throws Exception {
+
+        // given
+        when(rbacUserRepository.findByOptionalNameLike(null)).thenReturn(
+            List.of(userAaa, userBbb));
+
+        // when
+        mockMvc.perform(MockMvcRequestBuilders
+                .get("/api/rbacusers")
+                .header("current-user", "mike@hostsharing.net")
+                .accept(MediaType.APPLICATION_JSON))
+
+            // then
+            .andExpect(status().isOk())
+            .andExpect(jsonPath("$", hasSize(2)))
+            .andExpect(jsonPath("$[0].name", is(userAaa.getName())))
+            .andExpect(jsonPath("$[1].name", is(userBbb.getName())));
+    }
+
+    @Test
+    void willListUsersByName() throws Exception {
+
+        // given
+        when(rbacUserRepository.findByOptionalNameLike("admin@aaa")).thenReturn(
+            List.of(userAaa));
+
+        // when
+        mockMvc.perform(MockMvcRequestBuilders
+                .get("/api/rbacusers")
+                .param("name", "admin@aaa")
+                .header("current-user", "mike@hostsharing.net")
+                .accept(MediaType.APPLICATION_JSON))
+
+            // then
+            .andExpect(status().isOk())
+            .andExpect(jsonPath("$", hasSize(1)))
+            .andExpect(jsonPath("$[0].name", is(userAaa.getName())));
+    }
+}

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

@@ -0,0 +1,315 @@
+package net.hostsharing.hsadminng.rbac.rbacuser;
+
+import net.hostsharing.hsadminng.context.Context;
+import net.hostsharing.test.Array;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.orm.jpa.JpaSystemException;
+
+import javax.persistence.EntityManager;
+import java.util.List;
+
+import static net.hostsharing.test.JpaAttempt.attempt;
+import static org.assertj.core.api.Assertions.assertThat;
+
+@DataJpaTest
+@ComponentScan(basePackageClasses = { Context.class, RbacUserRepository.class })
+class RbacUserRepositoryIntegrationTest {
+
+    @Autowired
+    Context context;
+
+    @Autowired
+    RbacUserRepository rbacUserRepository;
+
+    @Autowired EntityManager em;
+
+    @Nested
+    class FindByOptionalNameLike {
+
+        private static final String[] ALL_TEST_DATA_USERS = Array.of(
+            // @formatter:off
+            "mike@hostsharing.net", "sven@hostsharing.net",
+            "admin@aaa.example.com",
+            "aaa00@aaa.example.com", "aaa01@aaa.example.com", "aaa02@aaa.example.com",
+            "admin@aab.example.com",
+            "aab00@aab.example.com", "aab01@aab.example.com", "aab02@aab.example.com",
+            "admin@aac.example.com",
+            "aac00@aac.example.com", "aac01@aac.example.com", "aac02@aac.example.com"
+            // @formatter:on
+        );
+
+        @Test
+        public void hostsharingAdmin_withoutAssumedRole_canViewAllRbacUsers() {
+            // given
+            currentUser("mike@hostsharing.net");
+
+            // when
+            final var result = rbacUserRepository.findByOptionalNameLike(null);
+
+            // then
+            exactlyTheseRbacUsersAreReturned(result, ALL_TEST_DATA_USERS);
+        }
+
+        @Test
+        public void hostsharingAdmin_withAssumedHostsharingAdminRole_canViewAllRbacUsers() {
+            given:
+            currentUser("mike@hostsharing.net");
+            assumedRoles("global#hostsharing.admin");
+
+            // when
+            final var result = rbacUserRepository.findByOptionalNameLike(null);
+
+            then:
+            exactlyTheseRbacUsersAreReturned(result, ALL_TEST_DATA_USERS);
+        }
+
+        @Test
+        public void hostsharingAdmin_withAssumedCustomerAdminRole_canViewOnlyUsersHavingRolesInThatCustomersRealm() {
+            given:
+            currentUser("mike@hostsharing.net");
+            assumedRoles("customer#aaa.admin");
+
+            // when
+            final var result = rbacUserRepository.findByOptionalNameLike(null);
+
+            then:
+            exactlyTheseRbacUsersAreReturned(
+                result,
+                "admin@aaa.example.com",
+                "aaa00@aaa.example.com", "aaa01@aaa.example.com", "aaa02@aaa.example.com"
+            );
+        }
+
+        @Test
+        public void customerAdmin_withoutAssumedRole_canViewOnlyUsersHavingRolesInThatCustomersRealm() {
+            // given:
+            currentUser("admin@aaa.example.com");
+
+            // when:
+            final var result = rbacUserRepository.findByOptionalNameLike(null);
+
+            // then:
+            exactlyTheseRbacUsersAreReturned(
+                result,
+                "admin@aaa.example.com",
+                "aaa00@aaa.example.com", "aaa01@aaa.example.com", "aaa02@aaa.example.com"
+            );
+        }
+
+        @Test
+        public void customerAdmin_withAssumedOwnedPackageAdminRole_canViewOnlyUsersHavingRolesInThatPackage() {
+            currentUser("admin@aaa.example.com");
+            assumedRoles("package#aaa00.admin");
+
+            final var result = rbacUserRepository.findByOptionalNameLike(null);
+
+            exactlyTheseRbacUsersAreReturned(result, "aaa00@aaa.example.com");
+        }
+
+        @Test
+        public void packageAdmin_withoutAssumedRole_canViewOnlyUsersHavingRolesInThatPackage() {
+            currentUser("aaa00@aaa.example.com");
+
+            final var result = rbacUserRepository.findByOptionalNameLike(null);
+
+            exactlyTheseRbacUsersAreReturned(result, "aaa00@aaa.example.com");
+        }
+
+    }
+
+    @Nested
+    class ListUserPermissions {
+
+        private static final String[] ALL_USER_PERMISSIONS = Array.of(
+            // @formatter:off
+            "global#hostsharing.admin -> global#hostsharing: add-customer",
+
+            "customer#aaa.admin -> customer#aaa: add-package",
+            "customer#aaa.admin -> customer#aaa: view",
+            "customer#aaa.owner -> customer#aaa: *",
+            "customer#aaa.tenant -> customer#aaa: view",
+            "package#aaa00.admin -> package#aaa00: add-domain",
+            "package#aaa00.admin -> package#aaa00: add-unixuser",
+            "package#aaa00.tenant -> package#aaa00: view",
+            "package#aaa01.admin -> package#aaa01: add-domain",
+            "package#aaa01.admin -> package#aaa01: add-unixuser",
+            "package#aaa01.tenant -> package#aaa01: view",
+            "package#aaa02.admin -> package#aaa02: add-domain",
+            "package#aaa02.admin -> package#aaa02: add-unixuser",
+            "package#aaa02.tenant -> package#aaa02: view",
+
+            "customer#aab.admin -> customer#aab: add-package",
+            "customer#aab.admin -> customer#aab: view",
+            "customer#aab.owner -> customer#aab: *",
+            "customer#aab.tenant -> customer#aab: view",
+            "package#aab00.admin -> package#aab00: add-domain",
+            "package#aab00.admin -> package#aab00: add-unixuser",
+            "package#aab00.tenant -> package#aab00: view",
+            "package#aab01.admin -> package#aab01: add-domain",
+            "package#aab01.admin -> package#aab01: add-unixuser",
+            "package#aab01.tenant -> package#aab01: view",
+            "package#aab02.admin -> package#aab02: add-domain",
+            "package#aab02.admin -> package#aab02: add-unixuser",
+            "package#aab02.tenant -> package#aab02: view",
+
+            "customer#aac.admin -> customer#aac: add-package",
+            "customer#aac.admin -> customer#aac: view",
+            "customer#aac.owner -> customer#aac: *",
+            "customer#aac.tenant -> customer#aac: view",
+            "package#aac00.admin -> package#aac00: add-domain",
+            "package#aac00.admin -> package#aac00: add-unixuser",
+            "package#aac00.tenant -> package#aac00: view",
+            "package#aac01.admin -> package#aac01: add-domain",
+            "package#aac01.admin -> package#aac01: add-unixuser",
+            "package#aac01.tenant -> package#aac01: view",
+            "package#aac02.admin -> package#aac02: add-domain",
+            "package#aac02.admin -> package#aac02: add-unixuser",
+            "package#aac02.tenant -> package#aac02: view"
+            // @formatter:on
+        );
+
+        @Test
+        public void hostsharingAdmin_withoutAssumedRole_canViewTheirOwnPermissions() {
+            // given
+            currentUser("mike@hostsharing.net");
+
+            // when
+            final var result = rbacUserRepository.findPermissionsOfUser("mike@hostsharing.net");
+
+            // then
+            exactlyTheseRbacPermissionsAreReturned(result, ALL_USER_PERMISSIONS);
+        }
+
+        @Test
+        public void hostsharingAdmin_withAssumedHostmastersRole_willThrowException() {
+            // given
+            currentUser("mike@hostsharing.net");
+            assumedRoles("global#hostsharing.admin");
+
+            // when
+            final var result = attempt(em, () ->
+                rbacUserRepository.findPermissionsOfUser("mike@hostsharing.net")
+            );
+
+            // then
+            result.assertExceptionWithRootCauseMessage(
+                JpaSystemException.class,
+                "[400] grantedPermissions(...) does not support assumed roles");
+        }
+
+        @Test
+        public void customerAdmin_withoutAssumedRole_canViewTheirOwnPermissions() {
+            // given
+            currentUser("admin@aaa.example.com");
+
+            // when
+            final var result = rbacUserRepository.findPermissionsOfUser("admin@aaa.example.com");
+
+            // then
+            exactlyTheseRbacPermissionsAreReturned(result,
+                // @formatter:off
+                "customer#aaa.admin -> customer#aaa: add-package",
+                "customer#aaa.admin -> customer#aaa: view",
+                "customer#aaa.tenant -> customer#aaa: view",
+
+                "package#aaa00.admin -> package#aaa00: add-domain",
+                "package#aaa00.admin -> package#aaa00: add-unixuser",
+                "package#aaa00.tenant -> package#aaa00: view",
+
+                "package#aaa01.admin -> package#aaa01: add-domain",
+                "package#aaa01.admin -> package#aaa01: add-unixuser",
+                "package#aaa01.tenant -> package#aaa01: view",
+
+                "package#aaa02.admin -> package#aaa02: add-domain",
+                "package#aaa02.admin -> package#aaa02: add-unixuser",
+                "package#aaa02.tenant -> package#aaa02: view"
+                // @formatter:on
+            );
+        }
+
+        @Test
+        public void customerAdmin_withoutAssumedRole_isNotAllowedToViewGlobalAdminsPermissions() {
+            // given
+            currentUser("admin@aaa.example.com");
+
+            // when
+            final var result = attempt(em, () ->
+                rbacUserRepository.findPermissionsOfUser("mike@hostsharing.net")
+            );
+
+            // then
+            result.assertExceptionWithRootCauseMessage(
+                JpaSystemException.class,
+                "[403] permissions of user \"mike@hostsharing.net\" are not accessible to user \"admin@aaa.example.com\"");
+        }
+
+        @Test
+        public void customerAdmin_withoutAssumedRole_canViewAllPermissionsWithinThePacketsRealm() {
+            // given
+            currentUser("admin@aaa.example.com");
+
+            // when
+            final var result = rbacUserRepository.findPermissionsOfUser("aaa00@aaa.example.com");
+
+            // then
+            exactlyTheseRbacPermissionsAreReturned(result,
+                // @formatter:off
+                "customer#aaa.tenant -> customer#aaa: view",
+                // "customer#aaa.admin -> customer#aaa: view" - Not permissions through the customer admin!
+                "package#aaa00.admin -> package#aaa00: add-unixuser",
+                "package#aaa00.admin -> package#aaa00: add-domain",
+                "package#aaa00.tenant -> package#aaa00: view"
+                // @formatter:on
+            );
+        }
+
+        @Test
+        public void packetAdmin_withoutAssumedRole_canViewAllPermissionsWithinThePacketsRealm() {
+            // given
+            currentUser("aaa00@aaa.example.com");
+
+            // when
+            final var result = rbacUserRepository.findPermissionsOfUser("aaa00@aaa.example.com");
+
+            // then
+            exactlyTheseRbacPermissionsAreReturned(result,
+                // @formatter:off
+                "customer#aaa.tenant -> customer#aaa: view",
+                // "customer#aaa.admin -> customer#aaa: view" - Not permissions through the customer admin!
+                "package#aaa00.admin -> package#aaa00: add-unixuser",
+                "package#aaa00.admin -> package#aaa00: add-domain",
+                "package#aaa00.tenant -> package#aaa00: view"
+                // @formatter:on
+            );
+        }
+    }
+
+    void currentUser(final String currentUser) {
+        context.setCurrentUser(currentUser);
+        assertThat(context.getCurrentUser()).as("precondition").isEqualTo(currentUser);
+    }
+
+    void assumedRoles(final String assumedRoles) {
+        context.assumeRoles(assumedRoles);
+        assertThat(context.getAssumedRoles()).as("precondition").containsExactly(assumedRoles.split(";"));
+    }
+
+    void exactlyTheseRbacUsersAreReturned(final List<RbacUserEntity> actualResult, final String... expectedUserNames) {
+        assertThat(actualResult)
+            .extracting(RbacUserEntity::getName)
+            .containsExactlyInAnyOrder(expectedUserNames);
+    }
+
+    void exactlyTheseRbacPermissionsAreReturned(
+        final List<RbacUserPermission> actualResult,
+        final String... expectedRoleNames) {
+        assertThat(actualResult)
+            .extracting(p -> p.getRoleName() + " -> " + p.getObjectTable() + "#" + p.getObjectIdName() + ": " + p.getOp())
+            .containsExactlyInAnyOrder(expectedRoleNames);
+    }
+
+}

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

@@ -0,0 +1,14 @@
+package net.hostsharing.hsadminng.rbac.rbacuser;
+
+
+import static java.util.UUID.randomUUID;
+
+public class TestRbacUser {
+
+    static final RbacUserEntity userAaa = rbacRole("admin@aaa.example.com");
+    static final RbacUserEntity userBbb = rbacRole("admin@bbb.example.com");
+
+    static public RbacUserEntity rbacRole(final String userName) {
+        return new RbacUserEntity(randomUUID(), userName);
+    }
+}

src/test/java/net/hostsharing/test/Array.java

@@ -0,0 +1,13 @@
+package net.hostsharing.test;
+
+/**
+ *  Java has List.of(...), Set.of(...) and Map.of(...) all with varargs parameter,
+ *  but no Array.of(...). Here it is.
+ */
+public class Array {
+
+    @SafeVarargs
+    public static <E> E[] of(E... elements) {
+        return elements;
+    }
+}

src/test/java/net/hostsharing/test/JpaAttempt.java

@@ -71,9 +71,11 @@ public class JpaAttempt<T> {
 
     public void assertExceptionWithRootCauseMessage(
         final Class<? extends RuntimeException> expectedExceptionClass,
-        final String expectedRootCauseMessage) {
+        final String... expectedRootCauseMessages) {
-        assertThat(
+        assertThat(wasSuccessful()).isFalse();
-            firstRootCauseMessageLineOf(caughtException(expectedExceptionClass)))
+        final String firstRootCauseMessageLine = firstRootCauseMessageLineOf(caughtException(expectedExceptionClass));
-            .matches(".*" + expectedRootCauseMessage + ".*");
+        for ( String expectedRootCauseMessage: expectedRootCauseMessages ) {
+            assertThat(firstRootCauseMessageLine).contains(expectedRootCauseMessage);
+        }
     }
 }