后续会讲解如何实现方法拦截。其实与url拦截大同小异。
拦截方法，会更简单一点吧 基于PermissionEvaluator 可以自行先了解
1、了解主要的过滤器
1、SecurityMetadataSource
权限资源拦截器。
有一个接口继承与它FilterInvocationSecurityMetadataSource，但FilterInvocationSecurityMetadataSource只是一个标识接口，
对应于FilterInvocation，本身并无任何内容：
主要方法：
public Collection getAttributes(Object object) throws IllegalArgumentException {
}
每一次请求url，都会调用这个方法。object存储了请求的信息。如;rul
2、UserDetailsService
用户登录，会先调用这里面的 loadUserByUsername。通过用户名去查询用户是否存在数据库。
在这里面进行查询，获得用户权限信息
3、AccessDecisionManager
里面的decide方法。
// decide 方法是判定是否拥有权限的决策方法，
//authentication 是释UserService中循环添加到 GrantedAuthority 对象中的权限信息集合.
//object 包含客户端发起的请求的requset信息
，可转换为 HttpServletRequest request = ((FilterInvocation) object).getHttpRequest();
//configAttributes 为MyInvocationSecurityMetadataSource的getAttributes(Object object)这个方法返回的结果，
此方法是为了判定用户请求的url 是否在权限表中，如果在权限表中，则返回给 decide 方法，
用来判定用户是否有此权限。如果不在权限表中则放行。
@Override
public void decide(Authentication authentication, Object o, Collection configAttributes)
2、正式实战了
1 使用idea的Srping Initializr 创建一个项目 我的版本如下Pom.xml
4.0.0 com.example demo 0.0.1-SNAPSHOT jar demo Demo project for Spring Boot org.springframework.boot spring-boot-starter-parent 1.5.9.RELEASE UTF-8 UTF-8 1.8 1.8 1.8 3.2.7 1.2.2 org.springframework.boot spring-boot-starter-aop org.springframework.boot spring-boot-starter-security org.springframework.boot spring-boot-starter-thymeleaf org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-test test org.springframework.security spring-security-test test org.thymeleaf.extras thymeleaf-extras-springsecurity4 org.webjars bootstrap 3.3.7 mysql mysql-connector-java 5.1.6 com.mchange c3p0 0.9.5.2 commons-logging commons-logging org.springframework spring-jdbc org.mybatis mybatis ${mybatis.version} org.mybatis mybatis-spring ${mybatis-spring.version} org.springframework.boot spring-boot-maven-plugin
2，创建一个springSecurity配置类，你也可以使用配置文件的方法。我这里使用了boot的配置类
package com.example.config;
import com.example.service.CustomUserService;
import com.example.service.MyFilterSecurityInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.web.access.intercept.FilterSecurityInterceptor;
@Configuration //声明为配置类
@EnableWebSecurity //这里启动security
public class SpringSecurityConfig extends WebSecurityConfigurerAdapter{
@Autowired //下面会编写这个类
private MyFilterSecurityInterceptor myFilterSecurityInterceptor;
@Autowired //下面会编写这个类
private DefaultAccessDeniedHandler defaultAccessDeniedHandler;
@Bean
UserDetailsService customUserService(){ //注册UserDetailsService 的bean
return new CustomUserService();
}
@Override
protected void configure(AuthenticationManagerBuilder auth) throws Exception {
auth.userDetailsService(customUserService()); //user Details Service验证
}
@Override
protected void configure(HttpSecurity http) throws Exception {
http.exceptionHandling()
.accessDeniedHandler(defaultAccessDeniedHandler);
http.authorizeRequests()
.antMatchers("/css/**").permitAll()
.anyRequest().authenticated() //任何请求,登录后可以访问
.and()
.formLogin().loginPage("/login").failureUrl("/login?error").permitAll() //登录页面用户任意访问
.and()
.logout().permitAll(); //注销行为任意访问
http.addFilterBefore(myFilterSecurityInterceptor, FilterSecurityInterceptor.class);
}
}
3、自定义SecurityMetadataSource拦截器
package com.example.service;
import com.example.dao.PermissionDao;
import com.example.domain.Permission;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.access.SecurityConfig;
import org.springframework.security.web.FilterInvocation;
import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;
import org.springframework.security.web.util.matcher.AntPathRequestMatcher;
import org.springframework.stereotype.Service;
import javax.servlet.http.HttpServletRequest;
import java.util.*;
/**
*/
@Service
public class MyInvocationSecurityMetadataSourceService implements
FilterInvocationSecurityMetadataSource {
private HashMap> map =null;
@Autowired
private PermissionDao permissionDao;
/**
* 自定义方法。最好在项目启动时，去数据库查询一次就好。
* 数据库查询一次 权限表出现的所有要拦截的url
*/
public void loadResourceDefine(){
map = new HashMap<>();
Collection array;
ConfigAttribute cfg;
//去数据库查询 使用dao层。 你使用自己的即可
List permissions = permissionDao.findAll();
for(Permission permission : permissions) {
array = new ArrayList<>();
//下面你可以添加你想要比较的信息过去。 注意的是，需要在用户登录时存储的权限信息一致
cfg = new SecurityConfig(permission.getName());
//此处添加了资源菜单的名字，例如请求方法到ConfigAttribute的集合中去。此处添加的信息将会作为MyAccessDecisionManager类的decide的第三个参数。
array.add(cfg);
//用权限的getUrl() 作为map的key，用ConfigAttribute的集合作为 value，
map.put(permission.getUrl(), array);
}
}
//此方法是为了判定用户请求的url 是否在权限表中，如果在权限表中，则返回给 decide 方法，用来判定用户是否有此权限。如果不在权限表中则放行。
@Override
public Collection getAttributes(Object object) throws IllegalArgumentException {
FilterInvocation filterInvocation = (FilterInvocation) object;
String fullRequestUrl = filterInvocation.getFullRequestUrl();
//若是静态资源 不做拦截 下面写了单独判断静态资源方法
if (isMatcherAllowedRequest(filterInvocation)) {
System.out.println("我没有被拦截"+fullRequestUrl);
return null;
}
//map 为null 就去数据库查
if(map ==null) {
loadResourceDefine();
}
//测试 先每次都查
//object 中包含用户请求的request 信息
HttpServletRequest request = filterInvocation.getHttpRequest();
AntPathRequestMatcher matcher;
String resUrl;
for(Iterator iter = map.keySet().iterator(); iter.hasNext(); ) {
resUrl = iter.next();
matcher = new AntPathRequestMatcher(resUrl);
if(matcher.matches(request)) {
return map.get(resUrl);
}
}
return null;
}
/**
* 判断当前请求是否在允许请求的范围内
* @param fi 当前请求
* @return 是否在范围中
*/
private boolean isMatcherAllowedRequest(FilterInvocation fi){
return allowedRequest().stream().map(AntPathRequestMatcher::new)
.filter(requestMatcher -> requestMatcher.matches(fi.getHttpRequest()))
.toArray().length > 0;
}
/**
* @return 定义允许请求的列表
*/
private List allowedRequest(){
return Arrays.asList("/login","/css/**","/fonts/**","/js/**","/scss/**","/img/**");
}
@Override
public Collection getAllConfigAttributes() {
return null;
}
@Override
public boolean supports(Class clazz) {
return true;
}
}
自定义UserDetailsService 。登录的时候根据用户名去数据库查询用户拥有的权限信息
package com.example.service;
import com.example.dao.PermissionDao;
import com.example.dao.UserDao;
import com.example.domain.Permission;
import com.example.domain.SysRole;
import com.example.domain.SysUser;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.User;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Service;
import java.util.ArrayList;
import java.util.List;
/**
* Created by yangyibo on 17/1/18.
*/
@Service
public class CustomUserService implements UserDetailsService { //自定义UserDetailsService 接口
@Autowired
UserDao userDao;
@Autowired
PermissionDao permissionDao;
public UserDetails loadUserByUsername(String username) {
SysUser user = userDao.findByUserName(username);
for (SysRole role : user.getRoles()) {
System.out.println(role.getName());
}
if (user != null) {
//根据用户id 去查找用户拥有的资源
List permissions = permissionDao.findByAdminUserId(user.getId());
List grantedAuthorities = new ArrayList <>();
for (Permission permission : permissions) {
if (permission != null && permission.getName()!=null) {
GrantedAuthority grantedAuthority = new SimpleGrantedAuthority(permission.getName());
//1：此处将权限信息添加到 GrantedAuthority 对象中，在后面进行全权限验证时会使用GrantedAuthority 对象。
grantedAuthorities.add(grantedAuthority);
}
}
return new User(user.getUsername(), user.getPassword(), grantedAuthorities);
} else {
throw new UsernameNotFoundException("admin: " + username + " do not exist!");
}
}
}
自定义AccessDecisionManager
package com.example.service;
import org.springframework.security.access.AccessDecisionManager;
import org.springframework.security.access.AccessDeniedException;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.authentication.InsufficientAuthenticationException;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.stereotype.Service;
import java.util.Collection;
import java.util.Iterator;
@Service
public class MyAccessDecisionManager implements AccessDecisionManager {
// decide 方法是判定是否拥有权限的决策方法，
//authentication 是释CustomUserService中循环添加到 GrantedAuthority 对象中的权限信息集合.
//object 包含客户端发起的请求的requset信息，可转换为 HttpServletRequest request = ((FilterInvocation) object).getHttpRequest();
//configAttributes 为MyInvocationSecurityMetadataSource的getAttributes(Object object)这个方法返回的结果，此方法是为了判定用户请求的url 是否在权限表中，如果在权限表中，则返回给 decide 方法，用来判定用户是否有此权限。如果不在权限表中则放行。
@Override
public void decide(Authentication authentication, Object o, Collection configAttributes) throws AccessDeniedException, InsufficientAuthenticationException {
if (null == configAttributes || configAttributes.size() <= 0 ) {
return;
}
ConfigAttribute c;
String needRole;
for (Iterator iter = configAttributes.iterator(); iter.hasNext(); ) {
c = iter.next();
needRole = c.getAttribute();
for (GrantedAuthority ga : authentication.getAuthorities()) { //authentication 为在注释1 中循环添加到 GrantedAuthority 对象中的权限信息集合
if (needRole.trim().equals(ga.getAuthority())) {
return;
}
}
}
throw new AccessDeniedException("no right");
}
@Override
public boolean supports(ConfigAttribute configAttribute) {
return true;
}
@Override
public boolean supports(Class aClass) {
return true;
}
}
自定义拦截器
package com.example.service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.access.SecurityMetadataSource;
import org.springframework.security.access.intercept.AbstractSecurityInterceptor;
import org.springframework.security.access.intercept.InterceptorStatusToken;
import org.springframework.security.web.FilterInvocation;
import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;
import org.springframework.stereotype.Service;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import java.io.IOException;
@Service
public class MyFilterSecurityInterceptor extends AbstractSecurityInterceptor implements Filter {
@Autowired
private FilterInvocationSecurityMetadataSource securityMetadataSource;
@Autowired
private void setMyAccessDecisionManager(MyAccessDecisionManager myAccessDecisionManager) {
super.setAccessDecisionManager(myAccessDecisionManager);
}
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
FilterInvocation fi = new FilterInvocation(servletRequest, servletResponse, filterChain);
invoke(fi);
}
public void invoke(FilterInvocation fi) throws IOException, ServletException {
//fi里面有一个被拦截的url
//里面调用MyInvocationSecurityMetadataSource的getAttributes(Object object)这个方法获取fi对应的所有权限
//再调用MyAccessDecisionManager的decide方法来校验用户的权限是否足够
InterceptorStatusToken token = super.beforeInvocation(fi);
try {
//执行下一个拦截器
fi.getChain().doFilter(fi.getRequest(), fi.getResponse());
} finally {
super.afterInvocation(token, null);
}
}
@Override
public void destroy() {
}
@Override
public Class getSecureObjectClass() {
return FilterInvocation.class;
}
@Override
public SecurityMetadataSource obtainSecurityMetadataSource() {
return this.securityMetadataSource;
}
}
运行项目就实现了。去试试吧。
记得将自定义拦截器放进security的过滤器链中。
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