/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.hadoop.hdfs.server.namenode;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.protocol.AclException;
/**
* Support for ACLs is controlled by a configuration flag. If the configuration
* flag is false, then the NameNode will reject all ACL-related operations.
*/
final class AclConfigFlag {
private final boolean enabled;
/**
* Creates a new AclConfigFlag from configuration.
*
* @param conf Configuration to check
*/
public AclConfigFlag(Configuration conf) {
enabled = conf.getBoolean(DFSConfigKeys.DFS_NAMENODE_ACLS_ENABLED_KEY,
DFSConfigKeys.DFS_NAMENODE_ACLS_ENABLED_DEFAULT);
LogFactory.getLog(AclConfigFlag.class).info("ACLs enabled? " + enabled);
}
/**
* Checks the flag on behalf of an ACL API call.
*
* @throws AclException if ACLs are disabled
*/
public void checkForApiCall() throws AclException {
if (!enabled) {
throw new AclException(String.format(
"The ACL operation has been rejected. "
+ "Support for ACLs has been disabled by setting %s to false.",
DFSConfigKeys.DFS_NAMENODE_ACLS_ENABLED_KEY));
}
}
}