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   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
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   *
   *     http://www.apache.org/licenses/LICENSE-2.0
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   * Unless required by applicable law or agreed to in writing, software
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   * See the License for the specific language governing permissions and
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  package org.apache.cassandra.auth;
  
  import java.util.Set;
  
  import com.google.common.collect.Iterables;
  import com.google.common.collect.Sets;
  import org.apache.commons.lang3.RandomStringUtils;
  import org.junit.Assert;
  import org.junit.Before;
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import org.apache.cassandra.SchemaLoader;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.cql3.CQLTester;
  import org.apache.cassandra.cql3.QueryProcessor;
  import org.apache.cassandra.cql3.UntypedResultSet;
  import org.apache.cassandra.db.Keyspace;
  import org.apache.cassandra.db.marshal.UTF8Type;
  import org.apache.cassandra.exceptions.ConfigurationException;
  import org.apache.cassandra.exceptions.UnauthorizedException;
  import org.apache.cassandra.service.ClientState;
  import org.assertj.core.api.Assertions;
  
  import static org.apache.cassandra.auth.AuthKeyspace.NETWORK_PERMISSIONS;
  import static org.apache.cassandra.auth.AuthTestUtils.auth;
  import static org.apache.cassandra.auth.AuthTestUtils.getRolesReadCount;
  import static org.apache.cassandra.schema.SchemaConstants.AUTH_KEYSPACE_NAME;
  import static org.apache.cassandra.utils.LocalizeString.toLowerCaseLocalized;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertTrue;
  
  public class CassandraNetworkAuthorizerTest extends CQLTester
  {
      @BeforeClass
      public static void defineSchema() throws ConfigurationException
      {
          SchemaLoader.setupAuth(new AuthTestUtils.LocalCassandraRoleManager(),
                                 new AuthTestUtils.LocalPasswordAuthenticator(),
                                 new AuthTestUtils.LocalCassandraAuthorizer(),
                                 new AuthTestUtils.LocalCassandraNetworkAuthorizer(),
                                 new AuthTestUtils.LocalCassandraCIDRAuthorizer());
          AuthCacheService.initializeAndRegisterCaches();
          AuthTestUtils.setupSuperUser();
      }
  
      @Before
      public void clear()
      {
          Keyspace.open(AUTH_KEYSPACE_NAME).getColumnFamilyStore(NETWORK_PERMISSIONS).truncateBlocking();
      }
  
      private static void assertNoDcPermRow(String username)
      {
          String query = String.format("SELECT dcs FROM %s.%s WHERE role = '%s'",
                                       AUTH_KEYSPACE_NAME,
                                       NETWORK_PERMISSIONS,
                                       RoleResource.role(username).getName());
          UntypedResultSet results = QueryProcessor.executeInternal(query);
          assertTrue(results != null && results.isEmpty());
      }
  
      private static void assertDcPermRow(String username, String... dcs)
      {
          Set<String> expected = Sets.newHashSet(dcs);
          String query = String.format("SELECT dcs FROM %s.%s WHERE role = '%s'",
                                       AUTH_KEYSPACE_NAME,
                                       NETWORK_PERMISSIONS,
                                       RoleResource.role(username).getName());
          UntypedResultSet results = QueryProcessor.executeInternal(query);
          assertNotNull(results);
          UntypedResultSet.Row row = Iterables.getOnlyElement(results);
          Set<String> actual = row.getFrozenSet("dcs", UTF8Type.instance);
          Assert.assertEquals(expected, actual);
      }
  
      private static String createName()
      {
          return toLowerCaseLocalized(RandomStringUtils.randomAlphabetic(8));
      }
  
      private static DCPermissions dcPerms(String username)
      {
          AuthenticatedUser user = new AuthenticatedUser(username);
          return DatabaseDescriptor.getNetworkAuthorizer().authorize(user.getPrimaryRole());
      }
  
      @Test
      public void create()
      {
          String username = createName();
  
          // user should implicitly have access to all datacenters
          assertNoDcPermRow(username);
          auth("CREATE ROLE %s WITH password = 'password' AND LOGIN = true AND ACCESS TO DATACENTERS {'dc1', 'dc2'}", username);
          Assert.assertEquals(DCPermissions.subset("dc1", "dc2"), dcPerms(username));
          assertDcPermRow(username, "dc1", "dc2");
      }
  
      @Test
      public void alter()
      {
  
          String username = createName();
  
          assertNoDcPermRow(username);
          // user should implicitly have access to all datacenters
          auth("CREATE ROLE %s WITH password = 'password' AND LOGIN = true", username);
          Assert.assertEquals(DCPermissions.all(), dcPerms(username));
          assertDcPermRow(username);
  
          // unless explicitly restricted
          auth("ALTER ROLE %s WITH ACCESS TO DATACENTERS {'dc1', 'dc2'}", username);
          Assert.assertEquals(DCPermissions.subset("dc1", "dc2"), dcPerms(username));
          assertDcPermRow(username, "dc1", "dc2");
  
          auth("ALTER ROLE %s WITH ACCESS TO DATACENTERS {'dc1'}", username);
          Assert.assertEquals(DCPermissions.subset("dc1"), dcPerms(username));
          assertDcPermRow(username, "dc1");
  
          auth("ALTER ROLE %s WITH ACCESS TO ALL DATACENTERS", username);
          Assert.assertEquals(DCPermissions.all(), dcPerms(username));
          assertDcPermRow(username);
      }
  
      @Test
      public void alterAsUser()
      {
          String username = createName();
  
          assertNoDcPermRow(username);
          auth("CREATE ROLE %s WITH PASSWORD = 'password' AND LOGIN = true AND ACCESS TO DATACENTERS {'dc1'}", username);
          Assert.assertEquals(DCPermissions.subset("dc1"), dcPerms(username));
          assertDcPermRow(username, "dc1");
  
          // try to alter as a user
          ClientState userState = AuthTestUtils.getClientState(username);
          Assertions.assertThatThrownBy(() -> auth("ALTER ROLE %s WITH ACCESS TO DATACENTERS {'dc1', 'dc2'}", userState, username))
          .hasMessage("Only superusers are allowed to alter access to datacenters.")
          .isInstanceOf(UnauthorizedException.class);
  
          // nothing changed
          Assert.assertEquals(DCPermissions.subset("dc1"), dcPerms(username));
          assertDcPermRow(username, "dc1");
      }
  
      @Test
      public void drop()
      {
          String username = createName();
  
          assertNoDcPermRow(username);
          // user should implicitly have access to all datacenters
          auth("CREATE ROLE %s WITH password = 'password' AND LOGIN = true AND ACCESS TO DATACENTERS {'dc1'}", username);
          assertDcPermRow(username, "dc1");
  
          auth("DROP ROLE %s", username);
          assertNoDcPermRow(username);
      }
  
      @Test
      public void superUser()
      {
          String username = createName();
          auth("CREATE ROLE %s WITH password = 'password' AND LOGIN = true AND ACCESS TO DATACENTERS {'dc1'}", username);
          Assert.assertEquals(DCPermissions.subset("dc1"), dcPerms(username));
          assertDcPermRow(username, "dc1");
  
          // clear the roles cache to lose the (non-)superuser status for the user
          Roles.cache.invalidate();
          auth("ALTER ROLE %s WITH superuser = true", username);
          Assert.assertEquals(DCPermissions.all(), dcPerms(username));
      }
  
      @Test
      public void cantLogin()
      {
          String username = createName();
          auth("CREATE ROLE %s", username);
          Assert.assertEquals(DCPermissions.none(), dcPerms(username));
      }
  
      @Test
      public void getLoginPrivilegeFromRolesCache()
      {
          String username = createName();
          auth("CREATE ROLE %s", username);
          long readCount = getRolesReadCount();
          dcPerms(username);
          Assert.assertEquals(++readCount, getRolesReadCount());
          dcPerms(username);
          Assert.assertEquals(readCount, getRolesReadCount());
      }
  }
  