/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.keycloak.testsuite.admin.group;

import org.junit.Assert;
import org.junit.Test;
import org.keycloak.admin.client.resource.GroupResource;
import org.keycloak.admin.client.resource.GroupsResource;
import org.keycloak.admin.client.resource.RealmResource;
import org.keycloak.admin.client.resource.RoleMappingResource;
import org.keycloak.admin.client.resource.UsersResource;
import org.keycloak.events.admin.OperationType;
import org.keycloak.events.admin.ResourceType;
import org.keycloak.models.Constants;
import org.keycloak.representations.AccessToken;
import org.keycloak.representations.idm.ClientRepresentation;
import org.keycloak.representations.idm.CredentialRepresentation;
import org.keycloak.representations.idm.GroupRepresentation;
import org.keycloak.representations.idm.MappingsRepresentation;
import org.keycloak.representations.idm.RealmRepresentation;
import org.keycloak.representations.idm.RoleRepresentation;
import org.keycloak.representations.idm.UserRepresentation;
import org.keycloak.testsuite.admin.ApiUtil;
import org.keycloak.testsuite.util.AdminEventPaths;
import org.keycloak.testsuite.util.ClientBuilder;
import org.keycloak.testsuite.util.RoleBuilder;
import org.keycloak.testsuite.util.URLAssert;
import org.keycloak.testsuite.util.UserBuilder;
import org.keycloak.util.JsonSerialization;

import javax.ws.rs.NotFoundException;
import javax.ws.rs.core.Response;
import java.io.IOException;
import java.net.URI;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.UUID;
import javax.ws.rs.ClientErrorException;
import static org.hamcrest.Matchers.*;

import static org.junit.Assert.*;
import org.junit.Rule;
import org.junit.rules.ExpectedException;
import org.keycloak.admin.client.Keycloak;
import org.keycloak.models.AdminRoles;
import static org.keycloak.testsuite.Assert.assertNames;
import org.keycloak.testsuite.arquillian.AuthServerTestEnricher;
import org.keycloak.testsuite.auth.page.AuthRealm;
import org.keycloak.testsuite.util.GroupBuilder;

/**
 * @author <a href="mailto:mstrukel@redhat.com">Marko Strukelj</a>
 */
public class GroupTest extends AbstractGroupTest {

    @Rule
    public ExpectedException expectedException = ExpectedException.none();

    @Override
    public void addTestRealms(List<RealmRepresentation> testRealms) {
        RealmRepresentation testRealmRep = loadTestRealm(testRealms);

        testRealmRep.setEventsEnabled(true);

        List<UserRepresentation> users = testRealmRep.getUsers();

        UserRepresentation user = new UserRepresentation();
        user.setUsername("direct-login");
        user.setEmail("direct-login@localhost");
        user.setEnabled(true);
        List<CredentialRepresentation> credentials = new LinkedList<>();
        CredentialRepresentation credential = new CredentialRepresentation();
        credential.setType(CredentialRepresentation.PASSWORD);
        credential.setValue("password");
        credentials.add(credential);
        user.setCredentials(credentials);
        users.add(user);


        List<ClientRepresentation> clients = testRealmRep.getClients();

        ClientRepresentation client = new ClientRepresentation();
        client.setClientId("resource-owner");
        client.setDirectAccessGrantsEnabled(true);
        client.setSecret("secret");
        clients.add(client);
    }

    /**
     * KEYCLOAK-2716
     * @throws Exception
     */
    @Test
    public void testClientRemoveWithClientRoleGroupMapping() throws Exception {
        RealmResource realm = adminClient.realms().realm("test");

        ClientRepresentation client = new ClientRepresentation();
        client.setClientId("foo");
        client.setRootUrl("http://foo");
        client.setProtocol("openid-connect");
        Response response = realm.clients().create(client);
        response.close();
        String clientUuid = ApiUtil.getCreatedId(response);
        assertAdminEvents.assertEvent("test", OperationType.CREATE, AdminEventPaths.clientResourcePath(clientUuid), client, ResourceType.CLIENT);
        client = realm.clients().findByClientId("foo").get(0);

        RoleRepresentation role = new RoleRepresentation();
        role.setName("foo-role");
        realm.clients().get(client.getId()).roles().create(role);
        assertAdminEvents.assertEvent("test", OperationType.CREATE, AdminEventPaths.clientRoleResourcePath(clientUuid, "foo-role"), role, ResourceType.CLIENT_ROLE);
        role = realm.clients().get(client.getId()).roles().get("foo-role").toRepresentation();

        GroupRepresentation group = new GroupRepresentation();
        group.setName("2716");
        group = createGroup(realm, group);

        List<RoleRepresentation> list = new LinkedList<>();
        list.add(role);
        realm.groups().group(group.getId()).roles().clientLevel(client.getId()).add(list);
        assertAdminEvents.assertEvent("test", OperationType.CREATE, AdminEventPaths.groupRolesClientRolesPath(group.getId(), clientUuid), list, ResourceType.CLIENT_ROLE_MAPPING);

        realm.clients().get(client.getId()).remove();
        assertAdminEvents.assertEvent("test", OperationType.DELETE, AdminEventPaths.clientResourcePath(clientUuid), ResourceType.CLIENT);
    }

    private GroupRepresentation createGroup(RealmResource realm, GroupRepresentation group) {
        Response response = realm.groups().add(group);
        String groupId = ApiUtil.getCreatedId(response);
        response.close();

        assertAdminEvents.assertEvent("test", OperationType.CREATE, AdminEventPaths.groupPath(groupId), group, ResourceType.GROUP);

        // Set ID to the original rep
        group.setId(groupId);
        return group;
    }

    @Test
    public void createAndTestGroups() throws Exception {
        RealmResource realm = adminClient.realms().realm("test");
        {
            RoleRepresentation groupRole = new RoleRepresentation();
            groupRole.setName("topRole");
            realm.roles().create(groupRole);
        }
        RoleRepresentation topRole = realm.roles().get("topRole").toRepresentation();
        {
            RoleRepresentation groupRole = new RoleRepresentation();
            groupRole.setName("level2Role");
            realm.roles().create(groupRole);
        }
        RoleRepresentation level2Role = realm.roles().get("level2Role").toRepresentation();
        {
            RoleRepresentation groupRole = new RoleRepresentation();
            groupRole.setName("level3Role");
            realm.roles().create(groupRole);
        }
        RoleRepresentation level3Role = realm.roles().get("level3Role").toRepresentation();

        // Role events tested elsewhere
        assertAdminEvents.clear();

        GroupRepresentation topGroup = new GroupRepresentation();
        topGroup.setName("top");
        topGroup = createGroup(realm, topGroup);

        List<RoleRepresentation> roles = new LinkedList<>();
        roles.add(topRole);
        realm.groups().group(topGroup.getId()).roles().realmLevel().add(roles);
        assertAdminEvents.assertEvent("test", OperationType.CREATE, AdminEventPaths.groupRolesRealmRolesPath(topGroup.getId()), roles, ResourceType.REALM_ROLE_MAPPING);

        GroupRepresentation level2Group = new GroupRepresentation();
        level2Group.setName("level2");
        Response response = realm.groups().group(topGroup.getId()).subGroup(level2Group);
        response.close();
        assertAdminEvents.assertEvent("test", OperationType.CREATE, AdminEventPaths.groupSubgroupsPath(topGroup.getId()), level2Group, ResourceType.GROUP);

        URI location = response.getLocation();
        final String level2Id = ApiUtil.getCreatedId(response);
        final GroupRepresentation level2GroupById = realm.groups().group(level2Id).toRepresentation();
        assertEquals(level2Id, level2GroupById.getId());
        assertEquals(level2Group.getName(), level2GroupById.getName());

        URLAssert.assertGetURL(location, adminClient.tokenManager().getAccessTokenString(), new URLAssert.AssertJSONResponseHandler() {
            @Override
            protected void assertResponseBody(String body) throws IOException {
                GroupRepresentation level2 = JsonSerialization.readValue(body, GroupRepresentation.class);
                assertEquals(level2Id, level2.getId());
            }
        });

        level2Group = realm.getGroupByPath("/top/level2");
        Assert.assertNotNull(level2Group);
        roles.clear();
        roles.add(level2Role);
        realm.groups().group(level2Group.getId()).roles().realmLevel().add(roles);
        assertAdminEvents.assertEvent("test", OperationType.CREATE, AdminEventPaths.groupRolesRealmRolesPath(level2Group.getId()), roles, ResourceType.REALM_ROLE_MAPPING);

        GroupRepresentation level3Group = new GroupRepresentation();
        level3Group.setName("level3");
        response = realm.groups().group(level2Group.getId()).subGroup(level3Group);
        response.close();
        assertAdminEvents.assertEvent("test", OperationType.CREATE, AdminEventPaths.groupSubgroupsPath(level2Group.getId()), level3Group, ResourceType.GROUP);

        level3Group = realm.getGroupByPath("/top/level2/level3");
        Assert.assertNotNull(level3Group);
        roles.clear();
        roles.add(level3Role);
        realm.groups().group(level3Group.getId()).roles().realmLevel().add(roles);
        assertAdminEvents.assertEvent("test", OperationType.CREATE, AdminEventPaths.groupRolesRealmRolesPath(level3Group.getId()), roles, ResourceType.REALM_ROLE_MAPPING);

        topGroup = realm.getGroupByPath("/top");
        assertEquals(1, topGroup.getRealmRoles().size());
        assertTrue(topGroup.getRealmRoles().contains("topRole"));
        assertEquals(1, topGroup.getSubGroups().size());

        level2Group = topGroup.getSubGroups().get(0);
        assertEquals("level2", level2Group.getName());
        assertEquals(1, level2Group.getRealmRoles().size());
        assertTrue(level2Group.getRealmRoles().contains("level2Role"));
        assertEquals(1, level2Group.getSubGroups().size());

        level3Group = level2Group.getSubGroups().get(0);
        assertEquals("level3", level3Group.getName());
        assertEquals(1, level3Group.getRealmRoles().size());
        assertTrue(level3Group.getRealmRoles().contains("level3Role"));

        UserRepresentation user = realm.users().search("direct-login", -1, -1).get(0);
        realm.users().get(user.getId()).joinGroup(level3Group.getId());
        assertAdminEvents.assertEvent("test", OperationType.CREATE, AdminEventPaths.userGroupPath(user.getId(), level3Group.getId()), ResourceType.GROUP_MEMBERSHIP);

        List<GroupRepresentation> membership = realm.users().get(user.getId()).groups();
        assertEquals(1, membership.size());
        assertEquals("level3", membership.get(0).getName());

        AccessToken token = login("direct-login", "resource-owner", "secret", user.getId());
        assertTrue(token.getRealmAccess().getRoles().contains("topRole"));
        assertTrue(token.getRealmAccess().getRoles().contains("level2Role"));
        assertTrue(token.getRealmAccess().getRoles().contains("level3Role"));

        realm.addDefaultGroup(level3Group.getId());
        assertAdminEvents.assertEvent("test", OperationType.CREATE, AdminEventPaths.defaultGroupPath(level3Group.getId()), ResourceType.GROUP);

        List<GroupRepresentation> defaultGroups = realm.getDefaultGroups();
        assertEquals(1, defaultGroups.size());
        assertEquals(defaultGroups.get(0).getId(), level3Group.getId());

        UserRepresentation newUser = new UserRepresentation();
        newUser.setUsername("groupUser");
        newUser.setEmail("group@group.com");
        response = realm.users().create(newUser);
        String userId = ApiUtil.getCreatedId(response);
        response.close();
        assertAdminEvents.assertEvent("test", OperationType.CREATE, AdminEventPaths.userResourcePath(userId), newUser, ResourceType.USER);

        membership = realm.users().get(userId).groups();
        assertEquals(1, membership.size());
        assertEquals("level3", membership.get(0).getName());

        realm.removeDefaultGroup(level3Group.getId());
        assertAdminEvents.assertEvent("test", OperationType.DELETE, AdminEventPaths.defaultGroupPath(level3Group.getId()), ResourceType.GROUP);

        defaultGroups = realm.getDefaultGroups();
        assertEquals(0, defaultGroups.size());

        realm.groups().group(topGroup.getId()).remove();
        assertAdminEvents.assertEvent("test", OperationType.DELETE, AdminEventPaths.groupPath(topGroup.getId()), ResourceType.GROUP);

        try {
            realm.getGroupByPath("/top/level2/level3");
            Assert.fail("Group should not have been found");
        }
        catch (NotFoundException e) {}

        try {
            realm.getGroupByPath("/top/level2");
            Assert.fail("Group should not have been found");
        }
        catch (NotFoundException e) {}

        try {
            realm.getGroupByPath("/top");
            Assert.fail("Group should not have been found");
        }
        catch (NotFoundException e) {}

        Assert.assertNull(login("direct-login", "resource-owner", "secret", user.getId()).getRealmAccess());
    }

    @Test
    public void updateGroup() {
        RealmResource realm = adminClient.realms().realm("test");
        final String groupName = "group-" + UUID.randomUUID();

        GroupRepresentation group = GroupBuilder.create()
          .name(groupName)
          .singleAttribute("attr1", "attrval1")
          .singleAttribute("attr2", "attrval2")
          .build();
        createGroup(realm, group);
        group = realm.getGroupByPath("/" + groupName);

        Assert.assertNotNull(group);
        assertThat(group.getName(), is(groupName));
        assertThat(group.getAttributes().keySet(), containsInAnyOrder("attr1", "attr2"));
        assertThat(group.getAttributes(), hasEntry(is("attr1"), contains("attrval1")));
        assertThat(group.getAttributes(), hasEntry(is("attr2"), contains("attrval2")));

        final String groupNewName = "group-" + UUID.randomUUID();
        group.setName(groupNewName);

        group.getAttributes().remove("attr1");
        group.getAttributes().get("attr2").add("attrval2-2");
        group.getAttributes().put("attr3", Collections.singletonList("attrval2"));

        realm.groups().group(group.getId()).update(group);
        assertAdminEvents.assertEvent("test", OperationType.UPDATE, AdminEventPaths.groupPath(group.getId()), group, ResourceType.GROUP);

        group = realm.getGroupByPath("/" + groupNewName);

        assertThat(group.getName(), is(groupNewName));
        assertThat(group.getAttributes().keySet(), containsInAnyOrder("attr2", "attr3"));
        assertThat(group.getAttributes(), hasEntry(is("attr2"), containsInAnyOrder("attrval2", "attrval2-2")));
        assertThat(group.getAttributes(), hasEntry(is("attr3"), contains("attrval2")));
    }

    @Test
    public void groupMembership() {
        RealmResource realm = adminClient.realms().realm("test");

        GroupRepresentation group = new GroupRepresentation();
        group.setName("group");
        String groupId = createGroup(realm, group).getId();

        Response response = realm.users().create(UserBuilder.create().username("user-a").build());
        String userAId = ApiUtil.getCreatedId(response);
        response.close();
        assertAdminEvents.assertEvent("test", OperationType.CREATE, AdminEventPaths.userResourcePath(userAId), ResourceType.USER);

        response = realm.users().create(UserBuilder.create().username("user-b").build());
        String userBId = ApiUtil.getCreatedId(response);
        response.close();
        assertAdminEvents.assertEvent("test", OperationType.CREATE, AdminEventPaths.userResourcePath(userBId), ResourceType.USER);

        realm.users().get(userAId).joinGroup(groupId);
        assertAdminEvents.assertEvent("test", OperationType.CREATE, AdminEventPaths.userGroupPath(userAId, groupId), group, ResourceType.GROUP_MEMBERSHIP);

        List<UserRepresentation> members = realm.groups().group(groupId).members(0, 10);
        assertNames(members, "user-a");

        realm.users().get(userBId).joinGroup(groupId);
        assertAdminEvents.assertEvent("test", OperationType.CREATE, AdminEventPaths.userGroupPath(userBId, groupId), group, ResourceType.GROUP_MEMBERSHIP);

        members = realm.groups().group(groupId).members(0, 10);
        assertNames(members, "user-a", "user-b");

        realm.users().get(userAId).leaveGroup(groupId);
        assertAdminEvents.assertEvent("test", OperationType.DELETE, AdminEventPaths.userGroupPath(userAId, groupId), group, ResourceType.GROUP_MEMBERSHIP);

        members = realm.groups().group(groupId).members(0, 10);
        assertNames(members, "user-b");
    }

    @Test
    // KEYCLOAK-2700
    public void deleteRealmWithDefaultGroups() throws IOException {
        RealmRepresentation rep = new RealmRepresentation();
        rep.setRealm("foo");

        GroupRepresentation group = new GroupRepresentation();
        group.setName("default1");
        group.setPath("/default1");

        rep.setGroups(Collections.singletonList(group));
        rep.setDefaultGroups(Collections.singletonList("/default1"));

        adminClient.realms().create(rep);

        adminClient.realm(rep.getRealm()).remove();
    }

    @Test
    public void roleMappings() {
        RealmResource realm = adminClient.realms().realm("test");
        realm.roles().create(RoleBuilder.create().name("realm-role").build());
        realm.roles().create(RoleBuilder.create().name("realm-composite").build());
        realm.roles().create(RoleBuilder.create().name("realm-child").build());
        realm.roles().get("realm-composite").addComposites(Collections.singletonList(realm.roles().get("realm-child").toRepresentation()));

        Response response = realm.clients().create(ClientBuilder.create().clientId("myclient").build());
        String clientId = ApiUtil.getCreatedId(response);
        response.close();

        realm.clients().get(clientId).roles().create(RoleBuilder.create().name("client-role").build());
        realm.clients().get(clientId).roles().create(RoleBuilder.create().name("client-role2").build());
        realm.clients().get(clientId).roles().create(RoleBuilder.create().name("client-composite").build());
        realm.clients().get(clientId).roles().create(RoleBuilder.create().name("client-child").build());
        realm.clients().get(clientId).roles().get("client-composite").addComposites(Collections.singletonList(realm.clients().get(clientId).roles().get("client-child").toRepresentation()));


        // Roles+clients tested elsewhere
        assertAdminEvents.clear();

        GroupRepresentation group = new GroupRepresentation();
        group.setName("group");
        String groupId = createGroup(realm, group).getId();

        RoleMappingResource roles = realm.groups().group(groupId).roles();
        assertEquals(0, roles.realmLevel().listAll().size());

        // Add realm roles
        List<RoleRepresentation> l = new LinkedList<>();
        l.add(realm.roles().get("realm-role").toRepresentation());
        l.add(realm.roles().get("realm-composite").toRepresentation());
        roles.realmLevel().add(l);
        assertAdminEvents.assertEvent("test", OperationType.CREATE, AdminEventPaths.groupRolesRealmRolesPath(group.getId()), l, ResourceType.REALM_ROLE_MAPPING);

        // Add client roles
        RoleRepresentation clientRole = realm.clients().get(clientId).roles().get("client-role").toRepresentation();
        RoleRepresentation clientComposite = realm.clients().get(clientId).roles().get("client-composite").toRepresentation();
        roles.clientLevel(clientId).add(Collections.singletonList(clientRole));
        roles.clientLevel(clientId).add(Collections.singletonList(clientComposite));
        assertAdminEvents.assertEvent("test", OperationType.CREATE, AdminEventPaths.groupRolesClientRolesPath(group.getId(), clientId), Collections.singletonList(clientRole), ResourceType.CLIENT_ROLE_MAPPING);
        assertAdminEvents.assertEvent("test", OperationType.CREATE, AdminEventPaths.groupRolesClientRolesPath(group.getId(), clientId), Collections.singletonList(clientComposite), ResourceType.CLIENT_ROLE_MAPPING);

        // List realm roles
        assertNames(roles.realmLevel().listAll(), "realm-role", "realm-composite");
        assertNames(roles.realmLevel().listAvailable(), "admin", "offline_access", Constants.AUTHZ_UMA_AUTHORIZATION, "user", "customer-user-premium", "realm-composite-role", "sample-realm-role");
        assertNames(roles.realmLevel().listEffective(), "realm-role", "realm-composite", "realm-child");

        // List client roles
        assertNames(roles.clientLevel(clientId).listAll(), "client-role", "client-composite");
        assertNames(roles.clientLevel(clientId).listAvailable(), "client-role2");
        assertNames(roles.clientLevel(clientId).listEffective(), "client-role", "client-composite", "client-child");

        // Get mapping representation
        MappingsRepresentation all = roles.getAll();
        assertNames(all.getRealmMappings(), "realm-role", "realm-composite");
        assertEquals(1, all.getClientMappings().size());
        assertNames(all.getClientMappings().get("myclient").getMappings(), "client-role", "client-composite");

        // Remove realm role
        RoleRepresentation realmRoleRep = realm.roles().get("realm-role").toRepresentation();
        roles.realmLevel().remove(Collections.singletonList(realmRoleRep));
        assertAdminEvents.assertEvent("test", OperationType.DELETE, AdminEventPaths.groupRolesRealmRolesPath(group.getId()), Collections.singletonList(realmRoleRep), ResourceType.REALM_ROLE_MAPPING);
        assertNames(roles.realmLevel().listAll(), "realm-composite");

        // Remove client role
        RoleRepresentation clientRoleRep = realm.clients().get(clientId).roles().get("client-role").toRepresentation();
        roles.clientLevel(clientId).remove(Collections.singletonList(clientRoleRep));
        assertAdminEvents.assertEvent("test", OperationType.DELETE, AdminEventPaths.groupRolesClientRolesPath(group.getId(), clientId), Collections.singletonList(clientRoleRep), ResourceType.CLIENT_ROLE_MAPPING);
        assertNames(roles.clientLevel(clientId).listAll(), "client-composite");
    }


    /**
     * Verifies that the user does not have access to Keycloak Admin endpoint when role is not
     * assigned to that user.
     * @link https://issues.jboss.org/browse/KEYCLOAK-2964
     */
    @Test
    public void noAdminEndpointAccessWhenNoRoleAssigned() {
        String userName = "user-" + UUID.randomUUID();
        final String realmName = AuthRealm.MASTER;
        createUser(realmName, userName, "pwd");

        Keycloak userClient = Keycloak.getInstance(AuthServerTestEnricher.getAuthServerContextRoot() + "/auth",
          realmName, userName, "pwd", Constants.ADMIN_CLI_CLIENT_ID);

        expectedException.expect(ClientErrorException.class);
        expectedException.expectMessage(String.valueOf(Response.Status.FORBIDDEN.getStatusCode()));
        userClient.realms().findAll();  // Any admin operation will do
    }

    /**
     * Verifies that the role assigned to a user is correctly handled by Keycloak Admin endpoint.
     * @link https://issues.jboss.org/browse/KEYCLOAK-2964
     */
    @Test
    public void adminEndpointAccessibleWhenAdminRoleAssignedToUser() {
        String userName = "user-" + UUID.randomUUID();

        final String realmName = AuthRealm.MASTER;
        RealmResource realm = adminClient.realms().realm(realmName);
        RoleRepresentation adminRole = realm.roles().get(AdminRoles.ADMIN).toRepresentation();
        assertThat(adminRole, notNullValue());
        assertThat(adminRole.getId(), notNullValue());

        String userId = createUser(realmName, userName, "pwd");
        assertThat(userId, notNullValue());

        RoleMappingResource mappings = realm.users().get(userId).roles();
        mappings.realmLevel().add(Collections.singletonList(adminRole));

        Keycloak userClient = Keycloak.getInstance(AuthServerTestEnricher.getAuthServerContextRoot() + "/auth",
          realmName, userName, "pwd", Constants.ADMIN_CLI_CLIENT_ID);

        assertThat(userClient.realms().findAll(),  // Any admin operation will do
          not(empty()));
    }

    /**
     * Verifies that the role assigned to a user's group is correctly handled by Keycloak Admin endpoint.
     * @link https://issues.jboss.org/browse/KEYCLOAK-2964
     */
    @Test
    public void adminEndpointAccessibleWhenAdminRoleAssignedToGroup() {
        String userName = "user-" + UUID.randomUUID();
        String groupName = "group-" + UUID.randomUUID();

        final String realmName = AuthRealm.MASTER;
        RealmResource realm = adminClient.realms().realm(realmName);
        RoleRepresentation adminRole = realm.roles().get(AdminRoles.ADMIN).toRepresentation();
        assertThat(adminRole, notNullValue());
        assertThat(adminRole.getId(), notNullValue());

        String userId = createUser(realmName, userName, "pwd");
        GroupRepresentation group = GroupBuilder.create().name(groupName).build();
        Response response = realm.groups().add(group);
        String groupId = ApiUtil.getCreatedId(response);
        response.close();

        RoleMappingResource mappings = realm.groups().group(groupId).roles();
        mappings.realmLevel().add(Collections.singletonList(adminRole));

        realm.users().get(userId).joinGroup(groupId);

        Keycloak userClient = Keycloak.getInstance(AuthServerTestEnricher.getAuthServerContextRoot() + "/auth",
          realmName, userName, "pwd", Constants.ADMIN_CLI_CLIENT_ID);

        assertThat(userClient.realms().findAll(),  // Any admin operation will do
          not(empty()));
    }


    /**
     * Verifies that the role assigned to a user's group is correctly handled by Keycloak Admin endpoint.
     * @link https://issues.jboss.org/browse/KEYCLOAK-2964
     */
    @Test
    public void adminEndpointAccessibleWhenAdminRoleAssignedToGroupAfterUserJoinedIt() {
        String userName = "user-" + UUID.randomUUID();
        String groupName = "group-" + UUID.randomUUID();

        final String realmName = AuthRealm.MASTER;
        RealmResource realm = adminClient.realms().realm(realmName);
        RoleRepresentation adminRole = realm.roles().get(AdminRoles.ADMIN).toRepresentation();
        assertThat(adminRole, notNullValue());
        assertThat(adminRole.getId(), notNullValue());

        String userId = createUser(realmName, userName, "pwd");
        GroupRepresentation group = GroupBuilder.create().name(groupName).build();
        Response response = realm.groups().add(group);
        String groupId = ApiUtil.getCreatedId(response);
        response.close();

        realm.users().get(userId).joinGroup(groupId);

        RoleMappingResource mappings = realm.groups().group(groupId).roles();
        mappings.realmLevel().add(Collections.singletonList(adminRole));

        Keycloak userClient = Keycloak.getInstance(AuthServerTestEnricher.getAuthServerContextRoot() + "/auth",
          realmName, userName, "pwd", Constants.ADMIN_CLI_CLIENT_ID);

        assertThat(userClient.realms().findAll(),  // Any admin operation will do
          not(empty()));
    }

    @Test
    public void defaultMaxResults() {
        GroupsResource groups = adminClient.realms().realm("test").groups();
        Response response = groups.add(GroupBuilder.create().name("test").build());
        String groupId = ApiUtil.getCreatedId(response);
        response.close();

        GroupResource group = groups.group(groupId);

        UsersResource users = adminClient.realms().realm("test").users();

        for (int i = 0; i < 110; i++) {
            Response r = users.create(UserBuilder.create().username("test-" + i).build());
            String userId = ApiUtil.getCreatedId(r);
            r.close();

            users.get(userId).joinGroup(groupId);
        }

        assertEquals(100, group.members(null, null).size());
        assertEquals(105, group.members(0, 105).size());
        assertEquals(110, group.members(0, 1000).size());
    }
}
