集成ACEGI 进行权限控制
一. 简单介绍
1.1 本文目的
集成Acegi到自己的项目中, 并且将用户信息和权限放到数据库, 提供方法允许权限动态变化,变化后自动加载最新的权限
本文介绍Acegi例子的时候采用的是acegi-security-samples-tutorial-1.0.6.war
阅读本文需要对Spring有一定的了解, 如果你还没有接触过, 有些地方可能不容易理解, 这时候可能需要参考本文后附的Spring地址, 先了解一下Spring的基本知识.
本文使用的是Mysql数据库, 如果你使用其他的数据库, 可能需要修改相应的SQL.
1.2 安装与配置
项目主页: http://www.acegisecurity.org/
下载地址: http://sourceforge.net/project/showfiles.php?group_id=104215
解压文件后, 将acegi-security-samples-tutorial-1.0.6.war复制Your_Tomcat_Path/webapps/
启动Tomcat, 访问http://localhost:8080/acegi-security-samples-tutorial-1.0.6/
点击页面上任何一个链接,都需要用户登录后访问, 可以在页面上看到可用的用户名和密码.
二. 开始集成到自己的程序中
2.1 将用户和角色放在数据库中
可能是为了演示方便, 简单的展示Acegi如何控制权限, 而不依赖于任何数据库, ACEGI给出的例子采用InMemoryDaoImpl获取用户信息, 用户和角色信息放在WEB-INF/users.properties 文件中, InMemoryDaoImpl 一次性的从该配置文件中读出用户和角色信息, 格式是: 用户名=密码, 角色名, 如第一行是:
marissa=koala,ROLE_SUPERVISOR
就是说marissa的密码是koala, 并且他的角色是ROLE_SUPERVISOR
对这个文件的解析是通过applicationContext-acegi-security.xml中如下的设置进行的:
1 <!-- UserDetailsService is the most commonly frequently
Acegi Security interface implemented by end users -->
2 <bean id="userDetailsService"
3 class="org.acegisecurity.userdetails.memory.InMemoryDaoImpl">
4 <property name="userProperties">
5 <bean
6 class="org.springframework.beans.factory.config.PropertiesFactoryBean">
7 <property name="location"
8 value="classpath:sers.properties" />
9 </bean>
10 </property>
11 </bean>
12
13
除了InMemoryDaoImpl之外, ACEGI还提供了Jdbc和 ldap的支持, 由于使用数据库进行验证比较常见, 下面仅就jdbc实现做出介绍.
不管是InMemoryDaoImpl还是JdbcDaoImpl都是实现了UserDetailsService接口, 而这个接口里只定义了一个方法: UserDetails loadUserByUsername(String username) 就是根据用户名加载UserDetails对象, UserDetails也是一个接口, 定义了一个用户所需要的基本信息, 包括: username, password, authorities等信息
2.1.1 直接使用JdbcDaoImpl 访问数据库中的用户信息
如果ACEGI提供的信息满足你的需要, 也就是说你只需要用户的username, password等信息, 你可以直接使用ACEGI提供的Schema, 这样, 不需要任何变动, JdbcDaoImpl就可以使用了.
如果你的数据库已经定义好了, 或者不想使用ACEGI提供的Schema,那么你也可以自定义JdbcDaoImpl的查询语句
1 <property name="usersByUsernameQuery">
2 <value>
3 SELECT email, password, enabled from user u where email = ?
4 </value>
5 </property>
6 <property name="authoritiesByUsernameQuery">
7 <value>
8 SELECT u.email, r.role_name FROM user_role ur, user u, role r WHERE
9 ur.user_id = u.user_id and ur.role_id = r.role_id and u.email = ?
10 </value>
11 </property>
2.1.2 扩展JdbcDaoImpl获取更多用户信息
如果上面提到的定制查询SQL语句不能提供足够的灵活性, 那么你可能就需要定义一个JdbcDaoImpl的子类, 如果变动不大, 通过覆盖initMappingSqlQueries方法重新定义MappingSqlQuery的实例. 而如果你需要获取更多信息, 比如userId, companyId等, 那就需要做更多的改动, 第一种改动不大, 所以不具体介绍, 下面以第二种改动为例,介绍如何实现这种需求.
我们需要三张表User, Role, User_Role, 具体的SQL如下:
1 1 #
2 2 # Structure for the `role` table :
3 3 #
4 4 DROP TABLE IF EXISTS `role`;
5 5 CREATE TABLE `role` (
6 6 `role_id` int(11) NOT NULL auto_increment,
7 7 `role_name` varchar(50) default NULL,
8 8 `description` varchar(20) default NULL,
9 9 `enabled` tinyint(1) NOT NULL default '1',
10 10 PRIMARY KEY (`role_id`)
11 11 );
12 12 #
13 13 # Structure for the `user` table :
14 14 #
15 15 DROP TABLE IF EXISTS `user`;
16 16 CREATE TABLE `user` (
17 17 `user_id` int(11) NOT NULL auto_increment,
18 18 `company_id` int(11) default NULL,
19 19 `email` varchar(200) default NULL,
20 20 `password` varchar(10) default NULL,
21 21 `enabled` tinyint(1) default NULL,
22 22 PRIMARY KEY (`user_id`)
23 23 );
24 24 #
25 25 # Structure for the `user_role` table :
26 26 #
27 27 DROP TABLE IF EXISTS `user_role`;
28 28 CREATE TABLE `user_role` (
29 29 `user_role_id` int(11) NOT NULL auto_increment,
30 30 `user_id` varchar(50) NOT NULL,
31 31 `role_id` int(11) NOT NULL,
32 32 PRIMARY KEY (`user_role_id`)
33 33 );
前面讲过, UserDetailsService接口中只定义了一个方法: UserDetails loadUserByUsername(String username), UserDetails中不存在我们需要的userId 和companyId等信息, 所以我们首先需要扩展UserDetails接口, 并扩展org.acegisecurity.userdetails.User:
IUserDetails.java
UserDetailsImpl.java
1 package org.security;
2 import org.acegisecurity.GrantedAuthority;
3 import org.acegisecurity.userdetails.User;
4 /**
5 * The class <code>UserDetailsImpl</code> extends the
* org.acegisecurity.userdetails.User class, and provides
* additional userId, companyId information
6 * @author wade
7 *
8 * @see IUserDetails, User
9 */
10 public class UserDetailsImpl extends User implements IUserDetails{
11 private int user_id;
12 private int company_id;
13 private String username;
14 private GrantedAuthority[] authorities;
15 public UserDetailsImpl(String username, String password, boolean enabled,
16 boolean accountNonExpired, boolean credentialsNonExpired,
17 boolean accountNonLocked, GrantedAuthority[] authorities)
18 throws IllegalArgumentException {
19 super(username, password, enabled, accountNonExpired, credentialsNonExpired,
20 accountNonLocked, authorities);
21 setUsername(username);
22 setAuthorities(authorities);
23 }
24 public UserDetailsImpl(int userid, int companyid, String username,
String password, boolean enabled,
25 boolean accountNonExpired, boolean credentialsNonExpired,
26 boolean accountNonLocked, GrantedAuthority[] authorities)
27 throws IllegalArgumentException {
28 super(username, password, enabled, accountNonExpired, credentialsNonExpired,
29 accountNonLocked, authorities);
30 this.user_id = userid;
31 this.company_id = companyid;
32 setUsername(username);
33 setAuthorities(authorities);
34 }
35 public int getUserId() {
36 return user_id;
37 }
38 public void setUserId(int user_id) {
39 this.user_id = user_id;
40 }
41 public int getCompanyId() {
42 return company_id;
43 }
44 public void setCompanyId(int company_id) {
45 this.company_id = company_id;
46 }
47 public String getUsername() {
48 return username;
49 }
50 public void setUsername(String username) {
51 this.username = username;
52 }
53 public GrantedAuthority[] getAuthorities() {
54 return authorities;
55 }
56 public void setAuthorities(GrantedAuthority[] authorities) {
57 this.authorities = authorities;
58 }
59 }
到此为止, 我们已经准备好了存放用户信息的类, 下面就开始动手修改取用户数据的代码.
假设我们用下面的SQL取用户信息:
SELECT u.user_id, u.company_id, email, password, enabled
FROM role r, user_role ur, user u
WHERE r.role_id = ur.role_id
and ur.user_id = u.user_id
and email = ?
limit 1
用下面的SQL取用户具有的Role列表
SELECT u.email, r.role_name
FROM user_role ur, user u, role r
WHERE ur.user_id = u.user_id
and ur.role_id = r.role_id
and u.email = ?
我们需要修改的主要是两部分:
1. 取用户和用户角色的MappingSqlQuery, 增加了查询的userId和companyId.
2. loadUserByUsername方法, 修改了返回的对象类型,和很少的内部代码.
AcegiJdbcDaoImpl.java
1 package org.security.acegi;
2
3 import java.sql.ResultSet;
4
5 import java.sql.SQLException;
6
7 import java.sql.Types;
8
9 import java.util.List;
10
11 import javax.sql.DataSource;
12
13 import org.acegisecurity.GrantedAuthority;
14
15 import org.acegisecurity.GrantedAuthorityImpl;
16
17 import org.acegisecurity.userdetails.UsernameNotFoundException;
18
19 import org.acegisecurity.userdetails.jdbc.JdbcDaoImpl;
20
21 import org.security.IUserDetails;
22
23 import org.security.UserDetailsImpl;
24
25 import org.springframework.dao.DataAccessException;
26
27 import org.springframework.jdbc.core.SqlParameter;
28
29 import org.springframework.jdbc.object.MappingSqlQuery;
30
31 /**
32 * The class AcegiJdbcDaoImpl provides the method to
* get IUserDetail information from db which contains userId,
* companyId and UserDetail information.
33 *
34 * @author wade
35 *
36 */
37 public class AcegiJdbcDaoImpl extends JdbcDaoImpl {
38
39 public static final String DEF_USERS_BY_USERNAME_QUERY =
40
41 "SELECT u.user_id, u.company_id, email, password, enabled "+"from role r, user_role ur, user u where r.role_id = ur.role_id "+"and ur.user_id = u.user_id and email = ? limit 1";
42
43 public static final String DEF_AUTHORITIES_BY_USERNAME_QUERY =
44
45 "SELECT username,authority FROM authorities WHERE username = ?";
46
47 protected MappingSqlQuery rolesByUsernameMapping;
48
49 protected MappingSqlQuery usersByNameMapping;
50
51 private String authoritiesByUsernameQuery;
52
53 private String rolePrefix = "";
54
55 private String usersByUsernameQuery;
56
57 private boolean usernameBasedPrimaryKey = true;
58
59 public AcegiJdbcDaoImpl(){
60
61 usersByUsernameQuery = DEF_USERS_BY_USERNAME_QUERY;
62
63 authoritiesByUsernameQuery = DEF_AUTHORITIES_BY_USERNAME_QUERY;
64
65 }
66
67 public String getAuthoritiesByUsernameQuery() {
68
69 return authoritiesByUsernameQuery;
70
71 }
72
73 public String getRolePrefix() {
74
75 return rolePrefix;
76
77 }
78
79 public String getUsersByUsernameQuery() {
80
81 return usersByUsernameQuery;
82
83 }
84
85 protected void initMappingSqlQueries() {
86
87 this.usersByNameMapping = new UsersByUsernameMapping(getDataSource());
88
89 this.rolesByUsernameMapping = new AuthoritiesByUsernameMapping(getDataSource());
90
91 }
92
93 /**
94 * Allows the default query string used to retrieve authorities based on
* username to be overriden, if
95 * default table or column names need to be changed. The default query is {@link
96 * #DEF_AUTHORITIES_BY_USERNAME_QUERY}; when modifying this query,
* ensure that all returned columns are mapped
97 * back to the same column names as in the default query.
98 *
99 * @param queryString The query string to set
100 */
101 public void setAuthoritiesByUsernameQuery(String queryString) {
102
103 authoritiesByUsernameQuery = queryString;
104
105 }
106
107 /**
108 * Allows a default role prefix to be specified. If this is set to a non-empty value,
then it is
109 * automatically prepended to any roles read in from the db. This may for example be used to add the
110 * <code>ROLE_</code> prefix expected to exist in role names (by default) by some other Acegi Security framework
111 * classes, in the case that the prefix is not already present in the db.
112 *
113 * @param rolePrefix the new prefix
114 */
115 public void setRolePrefix(String rolePrefix) {
116
117 this.rolePrefix = rolePrefix;
118
119 }
120
121 /**
122 * If <code>true</code> (the default), indicates the {@link #getUsersByUsernameQuery()} returns a username
123 * in response to a query. If <code>false</code>, indicates that a primary key is used instead. If set to
124 * <code>true</code>, the class will use the database-derived username in the returned <code>UserDetailsImpl</code>.
125 * If <code>false</code>, the class will use the {@link #loadUserByUsername(String)} derived username in the
126 * returned <code>UserDetailsImpl</code>.
127 *
128 * @param usernameBasedPrimaryKey <code>true</code> if the mapping queries return the username <code>String</code>,
129 * or <code>false</code> if the mapping returns a database primary key.
130 */
131 public void setUsernameBasedPrimaryKey(boolean usernameBasedPrimaryKey) {
132
133 this.usernameBasedPrimaryKey = usernameBasedPrimaryKey;
134
135 }
136
137 /**
138 * Allows the default query string used to retrieve users based on username to be overriden, if default
139 * table or column names need to be changed. The default query is {@link #DEF_USERS_BY_USERNAME_QUERY}; when
140 * modifying this query, ensure that all returned columns are mapped back to the same column names as in the
141 * default query. If the 'enabled' column does not exist in the source db, a permanent true value for this column
142 * may be returned by using a query similar to <br><pre>
143 * "SELECT username,password,'true' as enabled FROM users WHERE username = ?"</pre>
144 *
145 * @param usersByUsernameQueryString The query string to set
146 */
147 public void setUsersByUsernameQuery(String usersByUsernameQueryString) {
148
149 this.usersByUsernameQuery = usersByUsernameQueryString;
150
151 }
152
153 public IUserDetails loadUserByUsername(String username)
154
155 throws UsernameNotFoundException, DataAccessException {
156
157 List users = usersByNameMapping.execute(username);
158
159 if (users.size() == 0) {
160
161 throw new UsernameNotFoundException("User not found");
162
163 }
164
165 IUserDetails user = (IUserDetails) users.get(0); // contains no GrantedAuthority[]
166 List dbAuths = rolesByUsernameMapping.execute(user.getUsername());
167 addCustomAuthorities(user.getUsername(), dbAuths);
168 if (dbAuths.size() == 0) {
169
170 throw new UsernameNotFoundException("User has no GrantedAuthority");
171
172 }
173
174 GrantedAuthority[] arrayAuths = (GrantedAuthority[]) dbAuths.toArray(new GrantedAuthority[dbAuths.size()]);
175
176 user.setAuthorities(arrayAuths);
177
178 if (!usernameBasedPrimaryKey) {
179
180 user.setUsername(username);
181
182 }
183
184 return user;
185
186 }
187
188 /**
189 * Query object to look up a user's authorities.
190 */
191 protected class AuthoritiesByUsernameMapping extends MappingSqlQuery {
192
193 protected AuthoritiesByUsernameMapping(DataSource ds) {
194
195 super(ds, authoritiesByUsernameQuery);
196
197 declareParameter(new SqlParameter(Types.VARCHAR));
198
199 compile();
200
201 }
202
203 protected Object mapRow(ResultSet rs, int rownum)
204
205 throws SQLException {
206
207 String roleName = rolePrefix + rs.getString(2);
208
209 GrantedAuthorityImpl authority = new GrantedAuthorityImpl(roleName);
210
211 return authority;
212
213 }
214
215 }
216
217 /**
218 * Query object to look up a user.
219 */
220 protected class UsersByUsernameMapping extends MappingSqlQuery {
221
222 protected UsersByUsernameMapping(DataSource ds) {
223
224 super(ds, usersByUsernameQuery);
225
226 declareParameter(new SqlParameter(Types.VARCHAR));
227
228 compile();
229
230 }
231
232 protected Object mapRow(ResultSet rs, int rownum)
233
234 throws SQLException {
235
236 int user_id = rs.getInt(1);
237
238 int company_id = rs.getInt(2);
239
240 String username = rs.getString(3);
241
242 String password = rs.getString(4);
243
244 boolean enabled = rs.getBoolean(5);
245
246 IUserDetails user = new UserDetailsImpl(username, password, enabled, true, true, true,
247
248 new GrantedAuthority[] {new GrantedAuthorityImpl("HOLDER")});
249
250 user.setUserId(user_id);
251
252 user.setCompanyId(company_id);
253
254 return user;
255
256 }
257
258 }
259
260 }
修改spring配置, 使用我们新建立的类:
1 <bean id="userDetailsService"
2 class="org.security.acegi.AcegiJdbcDaoImpl">
3 <property name="dataSource">
4 <ref bean="dataSource" />
5 </property>
6 <property name="usersByUsernameQuery">
7 <value>
8 SELECT u.user_id, u.company_id, email, password, enabled
9 from role r, user_role ur, user u where r.role_id = ur.role_id and ur.user_id = u.user_id
10 and email = ?
11 limit 1
12 </value>
13 </property>
14 <property name="authoritiesByUsernameQuery">
15 <value>
16 SELECT u.email, r.role_name FROM user_role ur, user u, role r WHERE
17 ur.user_id = u.user_id and ur.role_id = r.role_id and u.email = ?
18 </value>
19 </property>
20 </bean>
好了, 如果再有用户登录,就会调用我们的loadUserByUsername, 从数据库中读取用户数据了, 那用户的权限都有什么呢? 一个用户又对应着哪些ROLE呢? 下面先讲一下ACEGI 例子中的权限设置
2.2 将权限放在数据库中
截止到1.0.6版, Acegi没有提供直接从数据库读取权限的方法, 而是采用通过如下的配置设置权限:
1 <bean id="filterInvocationInterceptor"
2 class="org.acegisecurity.intercept.web.FilterSecurityInterceptor">
3 <property name="authenticationManager" ref="authenticationManager" />
4 <property name="accessDecisionManager">
5 <bean class="org.acegisecurity.vote.AffirmativeBased">
6 <property name="allowIfAllAbstainDecisions" value="false" />
7 <property name="decisionVoters">
8 <list>
9 <bean class="org.acegisecurity.vote.RoleVoter" />
10 <bean class="org.acegisecurity.vote.AuthenticatedVoter" />
11 </list>
12 </property>
13 </bean>
14 </property>
15 <property name="objectDefinitionSource">
16 <value><![CDATA[
17
18 CONVERT_URL_TO_LOWERCASE_BEFORE_COMPARISON
19
20 PATTERN_TYPE_APACHE_ANT
21
22 /secure/extreme/**=ROLE_SUPERVISOR
23
24 /secure/**=IS_AUTHENTICATED_REMEMBERED
25
26 /project/**=IS_AUTHENTICATED_REMEMBERED
27
28 /task/**=ROLE_DEVELOPER
29
30 /**=IS_AUTHENTICATED_ANONYMOUSLY
31
32 ]]></value>
33 </property>
34 </bean>
而对大部分项目, 将权限放在数据库中可能是更灵活的, 为此, 我们需要写一个类去读取权限, 为了使这个类尽量简单, 我们把它做成PathBasedFilterInvocationDefinitionMap和RegExpBasedFilterInvocationDefinitionMap的代理类, PathBasedFilterInvocationDefinitionMap 采用的是Ant Path 风格的匹配方式, 而RegExpBasedFilterInvocationDefinitionMap采用的是Perl5风格的匹配方式. 用户可以通过在配置文件中设置来选择具体比较方式, 默认的比较方式是Ant Path 风格的匹配方式.
这样我们需要做的就是读取权限列表, 并放到相应的代理类里面, 而具体的比较则由代理类进行.
需要的表结构: Resource, Role_Resource
1 DROP TABLE IF EXISTS `resource`;
2
3 CREATE TABLE `resource` (
4
5 `resource_id` int(11) NOT NULL auto_increment,
6
7 `parent_resource_id` int(11) default NULL,
8
9 `resource_name` varchar(50) default NULL,
10
11 `description` varchar(100) default NULL,
12
13 PRIMARY KEY (`resource_id`)
14
15 );
16
17 #
18
19 # Structure for the `resource_role` table :
20
21 #
22
23 DROP TABLE IF EXISTS `resource_role`;
24
25 CREATE TABLE `resource_role` (
26
27 `resource_role_id` int(11) NOT NULL auto_increment,
28
29 `resource_id` int(11) NOT NULL,
30
31 `role_id` int(11) NOT NULL,
32
33 PRIMARY KEY (`resource_role_id`)
34
35 );
添加我们的类:
AcegiJdbcDefinitionSourceImpl.java
1 package org.security.acegi;
2
3 import java.sql.ResultSet;
4
5 import java.sql.SQLException;
6
7 import java.util.HashMap;
8
9 import java.util.Iterator;
10
11 import java.util.List;
12
13 import java.util.Map;
14
15 import javax.sql.DataSource;
16
17 import org.acegisecurity.ConfigAttributeDefinition;
18
19 import org.acegisecurity.SecurityConfig;
20
21 import org.acegisecurity.intercept.web.FilterInvocationDefinitionMap;
22
23 import org.acegisecurity.intercept.web.FilterInvocationDefinitionSource;
24
25 import org.acegisecurity.intercept.web.PathBasedFilterInvocationDefinitionMap;
26
27 import org.acegisecurity.intercept.web.RegExpBasedFilterInvocationDefinitionMap;
28
29 import org.apache.commons.logging.Log;
30
31 import org.apache.commons.logging.LogFactory;
32
33 import org.security.IResourceRole;
34
35 import org.security.ResourceRoleImpl;
36
37 import org.security.event.IPermissionListener;
38
39 import org.security.event.PermissionEventPublisher;
40
41 import org.springframework.beans.factory.InitializingBean;
42
43 import org.springframework.jdbc.core.support.JdbcDaoSupport;
44
45 import org.springframework.jdbc.object.MappingSqlQuery;
46
47 /**
48 *
49 * The class <code>AcegiJdbcDefinitionSourceImpl</code> is proxy to
50 * PathBasedFilterInvocationDefinitionMap or RegExpBasedFilterInvocationDefinitionMap, This class get the permission
51 * settings from the database, the default sql script is: SELECT resource, role
52 * FROM role_permission, if it doesn't match your needs, changed it in bean
53 * setting. <br>
54 *
55 * <br>
56 * $log$<br>
57 * <br>
58 *
59 * @author $Author: wade $
60 * @see
61 */
62 public class AcegiJdbcDefinitionSourceImpl extends JdbcDaoSupport implements
63
64 InitializingBean, FilterInvocationDefinitionSource{
65
66 private Log logger = LogFactory.getLog(this.getClass());
67
68 public static final String DEF_PERMISSIONS_QUERY = "SELECT resource, role FROM role_permission";
69
70 /** The Perl5 expression */
71 String PERL5_KEY = "PATTERN_TYPE_PERL5";
72
73 /** The ant path expression */
74 String ANT_PATH_KEY = "PATTERN_TYPE_APACHE_ANT";
75
76 /* Set default to Ant Path Expression*/
77 private String resourceExpression = ANT_PATH_KEY;
78
79 private boolean convertUrlToLowercaseBeforeComparison = false;
80
81 private FilterInvocationDefinitionMap definitionSource = null;
82
83 private String permissionsQuery;
84
85 private String rolePrefix = "";
86
87 public AcegiJdbcDefinitionSourceImpl() {
88
89 permissionsQuery = DEF_PERMISSIONS_QUERY;
90
91 }
92
93 public String getAuthoritiesByUsernameQuery() {
94
95 return permissionsQuery;
96
97 }
98
99 public String getRolePrefix() {
100
101 return rolePrefix;
102
103 }
104
105 /**
106 * Allows the default query string used to retrieve permissions to be
107 * overriden, if default table or column names need to be changed. The
108 * default query is {@link #DEF_PERMISSIONS_QUERY}; when modifying this
109 * query, ensure that all returned columns are mapped back to the same
110 * column names as in the default query.
111 *
112 * @param queryString
113 * The query string to set
114 */
115 public void setPermissionsQuery(String queryString) {
116
117 permissionsQuery = queryString;
118
119 }
120
121 /**
122 * Allows a default role prefix to be specified. If this is set to a
123 * non-empty value, then it is automatically prepended to any roles read in
124 * from the db. This may for example be used to add the <code>ROLE_</code>
125 * prefix expected to exist in role names (by default) by some other Acegi
126 * Security framework classes, in the case that the prefix is not already
127 * present in the db.
128 *
129 * @param rolePrefix
130 * the new prefix
131 */
132 public void setRolePrefix(String rolePrefix) {
133
134 this.rolePrefix = rolePrefix;
135
136 }
137
138 /**
139 * Init the permission list from db
140 *
141 */
142 protected void initMap() {
143
144 // return if we have got the latest permission list
145 if (definitionSource != null) {
146
147 return;
148
149 }
150
151 logger.debug("getting permissions from db");
152
153 if (PERL5_KEY.equals(getResourceExpression())) {
154
155 definitionSource = new RegExpBasedFilterInvocationDefinitionMap();
156
157 } else if (ANT_PATH_KEY.equals(getResourceExpression())) {
158
159 definitionSource = new PathBasedFilterInvocationDefinitionMap();
160
161 } else {
162
163 throw new IllegalArgumentException("wrong resourceExpression value");
164
165 }
166
167 definitionSource.setConvertUrlToLowercaseBeforeComparison(isConvertUrlToLowercaseBeforeComparison());
168
169 MappingSqlQuery permissionsMapping = new PermissionsMapping(
170
171 getDataSource());
172
173 List<IResourceRole> resources = permissionsMapping.execute();
174
175 Map<String, String> map = new HashMap<String, String>();
176
177 for (int i = 0; i < resources.size(); i++) {
178
179 ConfigAttributeDefinition defn = new ConfigAttributeDefinition();
180
181 String resource = resources.get(i).getResource();
182
183 if (map.containsKey(resource)) {
184
185 continue;
186
187 } else {
188
189 map.put(resource, resource);
190
191 }
192
193 for (int j = i; j < resources.size(); j++) {
194
195 IResourceRole resourceRole = resources.get(j);
196
197 if (resource.equals(resourceRole.getResource())) {
198
199 defn.addConfigAttribute(new SecurityConfig(resourceRole
200
201 .getRole()));
202
203 // logger.debug("added role: " + resourceRole.getRole());
204 }
205 }
206 definitionSource.addSecureUrl(resources.get(i).getResource(), defn);
207 // logger.debug("added roles to :" +
208 // resources.get(i).getResource());
209 }
210 }
211 /**
212 * Query object to look up a user's authorities.
213 */
214 protected class PermissionsMapping extends MappingSqlQuery {
215
216 protected PermissionsMapping(DataSource ds) {
217
218 super(ds, permissionsQuery);
219
220 compile();
221
222 }
223
224 protected IResourceRole mapRow(ResultSet rs, int rownum)
225
226 throws SQLException {
227
228 String resource = rs.getString(1);
229
230 String role = rolePrefix + rs.getString(2);
231
232 IResourceRole resourceRole = new ResourceRoleImpl(resource, role);
233
234 return resourceRole;
235
236 }
237
238 }
239
240 public ConfigAttributeDefinition getAttributes(Object object)
241
242 throws IllegalArgumentException {
243
244 initMap();
245
246 if (definitionSource instanceof RegExpBasedFilterInvocationDefinitionMap) {
247
248 return ((RegExpBasedFilterInvocationDefinitionMap) definitionSource).getAttributes(object);
249
250 }else if(definitionSource instanceof PathBasedFilterInvocationDefinitionMap) {
251
252 return ((PathBasedFilterInvocationDefinitionMap) definitionSource).getAttributes(object);
253
254 }
255
256 throw new IllegalStateException("wrong type of " + definitionSource + ", it should be " + RegExpBasedFilterInvocationDefinitionMap.class
257 + " or " + PathBasedFilterInvocationDefinitionMap.class);
258
259 }
260
261 public Iterator getConfigAttributeDefinitions() {
262
263 initMap();
264
265 if (definitionSource instanceof RegExpBasedFilterInvocationDefinitionMap) {
266
267 return ((RegExpBasedFilterInvocationDefinitionMap) definitionSource).getConfigAttributeDefinitions();
268
269 }else if(definitionSource instanceof PathBasedFilterInvocationDefinitionMap) {
270
271 return ((PathBasedFilterInvocationDefinitionMap) definitionSource).getConfigAttributeDefinitions();
272
273 }
274
275 throw new IllegalStateException("wrong type of " + definitionSource + ", it should be " + RegExpBasedFilterInvocationDefinitionMap.class
276 + " or " + PathBasedFilterInvocationDefinitionMap.class);
277
278 }
279
280 public boolean supports(Class clazz) {
281
282 initMap();
283
284 if (definitionSource instanceof RegExpBasedFilterInvocationDefinitionMap) {
285
286 return ((RegExpBasedFilterInvocationDefinitionMap) definitionSource).supports(clazz);
287
288 }else if(definitionSource instanceof PathBasedFilterInvocationDefinitionMap) {
289
290 return ((PathBasedFilterInvocationDefinitionMap) definitionSource).supports(clazz);
291
292 }
293
294 throw new IllegalStateException("wrong type of " + definitionSource + ", it should be " + RegExpBasedFilterInvocationDefinitionMap.class
295 + " or " + PathBasedFilterInvocationDefinitionMap.class);
296
297 }
298
299 public String getResourceExpression() {
300
301 return resourceExpression;
302
303 }
304
305 public void setResourceExpression(String resourceExpression) {
306
307 this.resourceExpression = resourceExpression;
308
309 }
310
311 public boolean isConvertUrlToLowercaseBeforeComparison() {
312
313 return convertUrlToLowercaseBeforeComparison;
314
315 }
316
317 public void setConvertUrlToLowercaseBeforeComparison(
318
319 boolean convertUrlToLowercaseBeforeComparison) {
320
321 this.convertUrlToLowercaseBeforeComparison = convertUrlToLowercaseBeforeComparison;
322
323 }
324
325 }
326
修改spring配置, 使用我们新建立的类和对应的SQL:
1 <bean id="filterInvocationInterceptor"
2 class="org.acegisecurity.intercept.web.FilterSecurityInterceptor">
3
4 <property name="authenticationManager"
5 ref="authenticationManager" />
6
7 <property name="accessDecisionManager">
8
9 <bean class="org.acegisecurity.vote.AffirmativeBased">
10
11 <property name="allowIfAllAbstainDecisions"
12 value="false" />
13
14 <property name="decisionVoters">
15
16 <list>
17
18 <bean class="org.acegisecurity.vote.RoleVoter" />
19
20 <bean
21
22 class="org.acegisecurity.vote.AuthenticatedVoter" />
23
24 </list>
25
26 </property>
27
28 </bean>
29
30 </property>
31
32 <property name="objectDefinitionSource">
33
34 <ref bean="rolePermissionService"/>
35
36 </property>
37
38 </bean>
39
40 <bean id="rolePermissionService"
41 class="org.security.acegi.AcegiJdbcDefinitionSourceImpl">
42
43 <property name="dataSource">
44
45 <ref bean="dataSource" />
46
47 </property>
48
49 <property name="permissionsQuery">
50
51 <value>
52
53 SELECT resource_name, role_name FROM resource_role rr, resource re, role ro
54
55 WHERE rr.role_id = ro.role_id and rr.resource_id = re.resource_id
56
57 </value>
58
59 </property>
60
61 <property name="convertUrlToLowercaseBeforeComparison" value="false"></property>
62
63 <property name="resourceExpression" value="PATTERN_TYPE_APACHE_ANT"></property>
64
65 </bean>
2.3 使用JUnit进行测试
AcegiPermissionTestCase.java
package org.security;
import java.io.IOException;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import org.acegisecurity.AccessDeniedException;
import org.acegisecurity.Authentication;
import org.acegisecurity.ConfigAttributeDefinition;
import org.acegisecurity.GrantedAuthority;
import org.acegisecurity.GrantedAuthorityImpl;
import org.acegisecurity.intercept.web.FilterInvocation;
import org.acegisecurity.intercept.web.FilterInvocationDefinitionSource;
import org.acegisecurity.intercept.web.FilterSecurityInterceptor;
import org.acegisecurity.providers.UsernamePasswordAuthenticationToken;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.mock.web.MockHttpServletRequest;
import org.springframework.mock.web.MockHttpServletResponse;
import org.security.BaseSpringTestCase;
import org.security.IResourceRole;
import org.security.IUserDetails;
import org.security.ResourceRoleImpl;
import org.security.acegi.AcegiJdbcDaoImpl;
/**
*
* The class <code>AcegiPermissionTestCase</code> test acegi permission settings<br><br>
* $log$<br><br>
* @author $Author: wade $
* @version $Revision: 1.0 $
* @see
*/
public class AcegiPermissionTestCase extends BaseSpringTestCase {
@Autowired
private FilterInvocationDefinitionSource objectDefinitionSource;
@Autowired
private AcegiJdbcDaoImpl userDetailsService;
@Autowired
private FilterSecurityInterceptor filterInvocationInterceptor;
/**
* Get Authentication Token by username
* @param username
* @return Authentication
*/
protected Authentication getAuthentication(String username){
IUserDetails userDetail = userDetailsService.loadUserByUsername(username);
Authentication authenticated;
if(userDetail.isEnabled()){
authenticated = new UsernamePasswordAuthenticationToken(userDetail, username, userDetail.getAuthorities());
}else{
// authenticated = new AnonymousAuthenticationToken(username, userDetail, userDetail.getAuthorities());
authenticated = new UsernamePasswordAuthenticationToken(null, null, new GrantedAuthority[]{new GrantedAuthorityImpl("ROLE_ANONYMOUS")});
}
return authenticated;
}
/**
* get FilterInvocation from the url
* @param url
* @return FilterInvocation
*/
protected FilterInvocation getRequestedResource(String url){
MockHttpServletRequest request = new MockHttpServletRequest();
request.setServletPath(url);
MockHttpServletResponse response = new MockHttpServletResponse();
FilterChain filterchain = new FilterChain(){
public void doFilter(ServletRequest arg0, ServletResponse arg1)
throws IOException, ServletException {
}};
FilterInvocation object = new FilterInvocation(request, response, filterchain);
return object;
}
/**
* throws AccessDeniedException if no permission
* @param username
* @param uri
*/
public void checkPermission(boolean shouldHasPermission, String username, String url){
Authentication authenticated = getAuthentication(username);
FilterInvocation object = getRequestedResource(url);
ConfigAttributeDefinition attr = objectDefinitionSource.getAttributes(object);
boolean hasPermission = false;
try{
filterInvocationInterceptor.getAccessDecisionManager().decide(authenticated, object, attr);
hasPermission = true;
}catch(AccessDeniedException e){
hasPermission = false;
}
if(hasPermission){
assertTrue(username + " shouldn't be able to access " + url, shouldHasPermission);
}else{
assertFalse(username + " should be able to access " + url, shouldHasPermission);
}
}
public void testPermissionForAdmin(){
Map<IResourceRole, Boolean> map = new LinkedHashMap<IResourceRole, Boolean>();
map.put(new ResourceRoleImpl("/admin/index.jsp", "admin" ), true);
map.put(new ResourceRoleImpl("/admin/index.jsp", "project" ), false);
map.put(new ResourceRoleImpl("/admin/index.jsp", "dev" ), false);
map.put(new ResourceRoleImpl("/admin/index.jsp", "disabled" ), false);
map.put(new ResourceRoleImpl("/admin", "admin" ), true);
map.put(new ResourceRoleImpl("/admin", "project"), false);
map.put(new ResourceRoleImpl("/admin", "dev" ), false);
map.put(new ResourceRoleImpl("/admin", "disabled"), false);
map.put(new ResourceRoleImpl("/project/index.jsp", "admin" ), true);
map.put(new ResourceRoleImpl("/project/index.jsp", "project"), true);
map.put(new ResourceRoleImpl("/project/index.jsp", "dev" ), false);
map.put(new ResourceRoleImpl("/project/index.jsp", "disabled"), false);
map.put(new ResourceRoleImpl("/project", "admin" ), true);
map.put(new ResourceRoleImpl("/project", "project" ), true);
map.put(new ResourceRoleImpl("/project", "dev" ), false);
map.put(new ResourceRoleImpl("/project", "disabled" ), false);
map.put(new ResourceRoleImpl("/developer/index.jsp", "admin" ), true);
map.put(new ResourceRoleImpl("/developer/index.jsp", "project" ), true);
map.put(new ResourceRoleImpl("/developer/index.jsp", "dev" ), true);
map.put(new ResourceRoleImpl("/developer/index.jsp", "disabled" ), false);
map.put(new ResourceRoleImpl("/developer", "admin" ), true);
map.put(new ResourceRoleImpl("/developer", "project" ), true);
map.put(new ResourceRoleImpl("/developer", "dev" ), true);
map.put(new ResourceRoleImpl("/developer", "disabled" ), false);
map.put(new ResourceRoleImpl("/index.jsp", "admin" ), true);
map.put(new ResourceRoleImpl("/index.jsp", "project"), true);
map.put(new ResourceRoleImpl("/index.jsp", "dev" ), true);
map.put(new ResourceRoleImpl("/index.jsp", "disabled"), true);
map.put(new ResourceRoleImpl("/acegilogin.jsp", "admin" ), true);
map.put(new ResourceRoleImpl("/acegilogin.jsp", "project" ), true);
map.put(new ResourceRoleImpl("/acegilogin.jsp", "dev" ), true);
map.put(new ResourceRoleImpl("/acegilogin.jsp", "disabled" ), true);
Set<IResourceRole> keySet= map.keySet();
Iterator<IResourceRole> ita = keySet.iterator();
while(ita != null && ita.hasNext()){
IResourceRole resourceRole = ita.next();
boolean expectedPermission = map.get(resourceRole);
checkPermission(expectedPermission, resourceRole.getRole(), resourceRole.getResource());
}
}
}
三. 集成之后
3.1 更改数据库中的权限
到目前为止, 一切顺利, 但是有一个问题, 用户如何修改权限, 修改后我们写的类如何能知道权限变了, 需要去重新加载呢? 看来我们需要再加一些代码以便于在权限被修改后能够得到消息, 然后去刷新权限.
为此, 我们使用Observe(观察者) 模式, 在改变权限后, 由改变权限的类通过调用PermissionEventPublisher.update(this.getClass())发出消息说权限变了.
IPermissionListener.java
public interface IPermissionListener {
public void updatePermission(Class eventSource);
}
PermissionEventPublisher.java
1 package org.security.event;
2
3 import java.util.HashMap;
4
5 import java.util.Iterator;
6
7 import java.util.Map;
8
9 import org.apache.commons.logging.Log;
10
11 import org.apache.commons.logging.LogFactory;
12
13 /**
14 * The class PermissionEventPublisher provides a way to notify the IPermissionListener that the permission has been changed.
15 * @author wade
16 *
17 */
18 public class PermissionEventPublisher {
19
20 private static Log logger = LogFactory.getLog(PermissionEventPublisher.class);
21
22 private static Map<IPermissionListener, IPermissionListener> observerList =
23
24 new HashMap<IPermissionListener, IPermissionListener>();
25
26 /**
27 * Attach a listener for permission event
28 *
29 * @param subject
30 * @param listener
31 */
32 public static void attach(IPermissionListener listener){
33
34 observerList.put(listener, listener);
35
36 if(logger.isDebugEnabled()){
37
38 logger.debug("Added listener: " + listener.getClass().getName());
39
40 }
41
42 }
43
44 /**
45 * Detatch from the event updater
46 * @param listener
47 */
48 public static void detatch(IPermissionListener listener){
49
50 observerList.remove(listener);
51
52 if(logger.isDebugEnabled()){
53
54 logger.debug("Removeded listener: " + listener.getClass().getName());
55
56 }
57
58 }
59
60 /**
61 * send message to each listener.
62 * @param eventSource
63 */
64 public static void update(Class eventSource){
65
66 if(logger.isDebugEnabled()){
67
68 logger.debug("permission changed from "+eventSource.getName());
69
70 }
71
72 Iterator<IPermissionListener> ita = observerList.keySet().iterator();
73
74 while(ita.hasNext()){
75
76 IPermissionListener permissionListener = ita.next();
77
78 permissionListener.updatePermission(eventSource);
79
80 if(logger.isDebugEnabled()){
81
82 logger.debug("call update for listener=" + permissionListener.getClass().getName());
83
84 }
85
86 }
87
88 }
89
90 }
修改AcegiJdbcDefinitionSourceImpl.java, 增加updatePermission方法, 在权限变化后进行处理
1 public class AcegiJdbcDefinitionSourceImpl extends JdbcDaoSupport implements
2
3 InitializingBean, FilterInvocationDefinitionSource, IPermissionListener {
4
5 public AcegiJdbcDefinitionSourceImpl() {
6
7 permissionsQuery = DEF_PERMISSIONS_QUERY;
8
9 //attach to event publisher, so the class can get the notify when permission changes
10 PermissionEventPublisher.attach(this);
11
12 }
13
14 /**
15 * Set definitionSource to null, so we can get a refreshed permission list from db
16 */
17 public void updatePermission(Class eventSource) {
18
19 definitionSource = null;
20
21 }
22
23 }
3.2 在程序中获取当前用户
直接从Acegi中取用户信息不太方便, 为了简化获取用户的方法, 可以添加一个类封装对应的逻辑, 然后通过CurrentUser.getUser()直接取到用户信息.
CurrentUser.java
1 /**
2 * Get current user which stored in session
3 * You must set a user when using junit test
4 * @return IUserDetails
5 */
6 public static IUserDetails getUser(){
7
8 //if not in unit test environment, get the current user using acegi
9 if ((SecurityContextHolder.getContext() == null)
10
11 || !(SecurityContextHolder.getContext() instanceof SecurityContext)
12
13 || (((SecurityContext) SecurityContextHolder.getContext())
14
15 .getAuthentication() == null)) {
16
17 return null;
18
19 }
20
21 Authentication auth = SecurityContextHolder.getContext().getAuthentication();
22
23 if (auth.getPrincipal() == null) {
24
25 return null;
26
27 }
28
29 IUserDetails user = null;
30
31 if (auth.getPrincipal() instanceof IUserDetails) {
32
33 user = (IUserDetails)auth.getPrincipal();
34
35 }
36
37 return user;
38
39 }
40
3.3 使用Tag来判断用户是否具有某一种Role的权限
有一点一定要注意, 由于Filter的处理有顺序,所以需要将Acegi的Filter放在最前面.
<authz:authorize ifAnyGranted="ROLE_SUPERVISOR, ROLE_ADMINISTRATOR, ROLE_FULLACCESS">
Role in ROLE_SUPERVISOR, ROLE_ADMINISTRATOR, ROLE_FULLACCESS
</authz:authorize>
3.4 添加自己的Tag
Acegi 提供的Tag只能判断当前用户是不是具有某种Role, 不能判断当前用户对某一个URL有没有权限, 由于很多时候需要根据当前用户的权限来控制某些功能是否显示, 比如只有管理员才显示Add或Delete按钮
这是你可以自己写自己的Tag, 为了简单起见, 我们继承jstl的Tag, 比如下面实现两个条件的Tag, Tag的用法如下:
<auth:ifNotAuthrized url="/system/acl.action">如果当前用户没有指定url的权限,显示本部分内容</auth:ifNotAuthrized>
<auth:ifAuthrized url="/system/acl.action">如果当前用户有指定url的权限,显示本部分内容</auth:ifAuthrized>
AuthorizedTag.java
1 public class AuthorizedTag extends ConditionalTagSupport {
2
3 protected Log logger = LogFactory.getLog(this.getClass());
4
5 @Autowired
6
7 private FilterInvocationDefinitionSource objectDefinitionSource;
8
9 @Autowired
10
11 private FilterSecurityInterceptor filterInvocationInterceptor;
12
13 private String url;
14
15 /**
16 * Get Authentication Token from IUserDetails object
17 * @param user
18 * @return Authentication
19 */
20 protected Authentication getAuthentication(IUserDetails user){
21
22 IUserDetails userDetail = user;
23
24 Authentication authenticated;
25
26 if(userDetail == null){
27
28 authenticated = new UsernamePasswordAuthenticationToken(null, null, new GrantedAuthority[]{new GrantedAuthorityImpl("ROLE_ANONYMOUS")});
29
30 }else{
31
32 if(userDetail.isEnabled()){
33
34 authenticated = new UsernamePasswordAuthenticationToken(userDetail, userDetail.getUsername(), userDetail.getAuthorities());
35
36 }else{
37
38 authenticated = new AnonymousAuthenticationToken(userDetail.getUsername(), userDetail, userDetail.getAuthorities());
39
40 }
41
42 }
43
44 return authenticated;
45
46 }
47
48 /**
49 * get FilterInvocation from the url
50 * @param url
51 * @return FilterInvocation
52 */
53 protected FilterInvocation getRequestedResource(String url){
54
55 MockHttpServletRequest request = new MockHttpServletRequest(pageContext.getServletContext());
56
57 request.setServletPath(url);
58
59 FilterChain filterchain = new FilterChain(){
60
61 public void doFilter(ServletRequest arg0, ServletResponse arg1)
62
63 throws IOException, ServletException {
64
65 }};
66
67 FilterInvocation object = new FilterInvocation(request, pageContext.getResponse(), filterchain);
68
69 return object;
70
71 }
72
73 @Override
74
75 protected boolean condition() throws JspTagException {
76
77 boolean result = false;
78
79 IUserDetails user = CurrentUser.getUser();
80
81 ServletContext servletContext = pageContext.getServletContext();
82
83 WebApplicationContext wac = WebApplicationContextUtils.getRequiredWebApplicationContext(servletContext);
84
85 wac.getAutowireCapableBeanFactory().autowireBeanProperties(this, AutowireCapableBeanFactory.AUTOWIRE_BY_TYPE, false);
86
87 ConfigAttributeDefinition attr = objectDefinitionSource.getAttributes(getRequestedResource(url));
88
89 try{
90
91 filterInvocationInterceptor.getAccessDecisionManager().decide(getAuthentication(user), url, attr);
92
93 result = true;
94
95 }catch(AccessDeniedException e){
96
97 result = false;
98
99 if(user == null){
100
101 logger.debug("anonymous has no permission on :" + url);
102
103 }else{
104
105 logger.debug(user.getUsername() + " has no permission on :" + url);
106
107 }
108
109 }
110
111 return result;
112
113 }
114
115 public String getUrl() {
116
117 return url;
118
119 }
120
121 public void setUrl(String url) {
122
123 this.url = url;
124
125 }
126
127 }
添加Jsp页面测试新添加的Tag, 在文所附的例子程序中, 将Tag的测试代码放在index.jsp页面中, 任何人都可以访问该页面, 在页面上列出了全部地址的链接, 同时列出了当前用户有权限的地址, 这样可以方便地知道当前用户有哪些权限, 如果你想修改数据库中的权限, 然后再次测试, 可以点击页面右上侧的Reload Permission重新从数据库加载权限.
<auth:ifAuthrized url="/admin">
<p><a href="admin">Admin page</a></p>
</auth:ifAuthrized>
四. 参考文档
1. 更多深入介绍,可以根据Acegi官方提供的Suggested Steps (http://www.acegisecurity.org/suggested.html) 一步一步学习.
2. 如果要了解Acegi提供的各种功能, 可以参考http://www.acegisecurity.org/reference.html
3. 阅读本文需要对Spring有一定的了解, http://www.springframework.org/documentation
4. 扩展jstl的tag, 可以参看http://www.onjava.com/pub/a/onjava/2002/10/30/jstl3.html?page=1
5. 从https://sourceforge.net/project/platformdownload.php?group_id=216220下载本文附带的例子代码, 通过acegi.sql建立数据库, 然后将acegi-test.war放到Tomcat的webapps目录下, 或者你可以下载acegi-test.zip文件, 里面包含了完整的eclipse的项目以及sql文件.
访问http://youip:port/acegi-test, 列出全部地址的链接, 同时列出了当前用户有权限的地址链接
转自:http://acegi-test.sourceforge.net/