Apache ZooKeeper Server Source Code

Apache ZooKeeper is an open-source server which enables highly reliable distributed coordination.

Apache ZooKeeper Server Source Code files are provided in the source packge (apache-zookeeper-3.7.0.tar.gz). You can download it at Apache ZooKeeper Website.

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 * 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package org.apache.zookeeper.server.auth;

import java.util.List;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.data.ACL;
import org.apache.zookeeper.server.ServerCnxn;
import org.apache.zookeeper.server.ZooKeeperServer;

 * A variation on {@link AuthenticationProvider} that provides additional
 * parameters for more detailed authentication
public abstract class ServerAuthenticationProvider implements AuthenticationProvider {

    public static class ServerObjs {

        private final ZooKeeperServer zks;
        private final ServerCnxn cnxn;

         * @param zks
         *                the ZooKeeper server instance
         * @param cnxn
         *                the cnxn that received the authentication information.
        public ServerObjs(ZooKeeperServer zks, ServerCnxn cnxn) {
            this.zks = zks;
            this.cnxn = cnxn;

        public ZooKeeperServer getZks() {
            return zks;

        public ServerCnxn getCnxn() {
            return cnxn;


    public static class MatchValues {

        private final String path;
        private final String id;
        private final String aclExpr;
        private final int perm;
        private final List<ACL> setAcls;

         * @param path
         *                the path of the operation being authenticated
         * @param id
         *                the id to check.
         * @param aclExpr
         *                the expression to match ids against.
         * @param perm
         *                the permission value being authenticated
         * @param setAcls
         *                for set ACL operations, the list of ACLs being set. Otherwise null.
        public MatchValues(String path, String id, String aclExpr, int perm, List<ACL> setAcls) {
            this.path = path;
            this.id = id;
            this.aclExpr = aclExpr;
            this.perm = perm;
            this.setAcls = setAcls;

        public String getPath() {
            return path;

        public String getId() {
            return id;

        public String getAclExpr() {
            return aclExpr;

        public int getPerm() {
            return perm;

        public List<ACL> getSetAcls() {
            return setAcls;


     * This method is called when a client passes authentication data for this
     * scheme. The authData is directly from the authentication packet. The
     * implementor may attach new ids to the authInfo field of cnxn or may use
     * cnxn to send packets back to the client.
     * @param serverObjs
     *                cnxn/server/etc that received the authentication information.
     * @param authData
     *                the authentication data received.
     * @return indication of success or failure
    public abstract KeeperException.Code handleAuthentication(ServerObjs serverObjs, byte[] authData);

     * This method is called to see if the given id matches the given id
     * expression in the ACL. This allows schemes to use application specific
     * wild cards.
     * @param serverObjs
     *                cnxn/server/etc that received the authentication information.
     * @param matchValues
     *                values to be matched
    public abstract boolean matches(ServerObjs serverObjs, MatchValues matchValues);

    public final KeeperException.Code handleAuthentication(ServerCnxn cnxn, byte[] authData) {
        throw new UnsupportedOperationException();

    public final boolean matches(String id, String aclExpr) {
        throw new UnsupportedOperationException();




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2018-10-18, 29021👍, 1💬