学步园

ZooKeeeper has the following built in schemes:

ZooKeeper有如下几种内置的Schemes

• world has a single id, anyone, that represents anyone.

  代表所有人都能够访问

• auth doesn't use any id, represents any authenticated user.

  不需要Id，通过auth的用户都能够访问

• digest uses a username:password string to generate MD5 hash which is then used as an ACL ID identity. Authentication is done by sending
  the username:password in clear text. When used in the ACL the expression will be the username:base64 encoded SHA1 password digest.

  通过用户名密码方式的auth验证，Id的格式为username:base64 encoded SHA1 password digest

• host uses the client host name as an ACL ID identity. The ACL expression is a hostname suffix. For example, the ACL expression host:corp.com matches
  the ids host:host1.corp.com and host:host2.corp.com, but nothost:host1.store.com.

  使用客户端的host name作为Acl的Id

• ip uses the client host IP as an ACL ID identity. The ACL expression is of the form addr/bits where the most significant bits of addr are
  matched against the most significant bits of the client host IP.

  使用客户端的Ip作为Acl的

zookeeper目前支持下面一些权限：

• CREATE(c): 创建权限，可以在在当前node下创建child node
• DELETE(d): 删除权限，可以删除当前的node
• READ(r): 读权限，可以获取当前node的数据，可以list当前node所有的child nodes
• WRITE(w): 写权限，可以向当前node写数据
• ADMIN(a): 管理权限，可以设置当前node的permission

void create(path, [data], [acls], [mode], callback)

Create a node with given path, data, acls and mode.

Arguments

• path String - Path of the node.
• data Buffer - The data buffer, optional, defaults to null.
• acls Array - An array of ACL objects,
  optional, defaults to ACL.OPEN_ACL_UNSAFE
• mode CreateMode - The creation mode, optional, defaults to CreateMode.PERSISTENT
• callback(error, path) Function - The callback function.

new zookeeper.Id('ip', '127.0.0.1');
完整代码如下：
var zookeeper = require('node-zookeeper-client');
var id = new zookeeper.Id('ip', '192.168.1.123');
var client = zookeeper.createClient('192.168.1.100:2181');
var acl = new zookeeper.ACL(zookeeper.Permission.ADMIN, id);
client.create('/test', new Buffer('test'), [acl], zookeeper.CreateMode.PERSISTENT, function (err, path) {
  //handler callback
});

如何有客户端想访问/test节点，则需要通过上面的访问控制，具体代码如下:
var zookeeper = require('node-zookeeper-client');

var client = zookeeper.createClient('192.168.1.100:2181');

zookeeper.addAuthInfo('ip', new Buffer('192.168.1.123'));
client.getData('/test', null, function() {
  //handler callback
});