上篇《话说Spring Security权限管理（源码）》介绍了Spring Security权限控制管理的源码及实现，然而某些情况下，它默认的实现并不能满足我们项目的实际需求，有时候需要做一些自己的实现，本次将围绕上次的内容进行一次项目实战。
实战背景
背景描述
项目中需要做细粒的权限控制，细微至url + httpmethod (满足restful，例如: https://.../xxx/users/1, 某些角色只能查看(HTTP GET), 而无权进行增改删（POST, PUT, DELETE）)。
表设计
为避嫌，只列出要用到的关键字段，其余敬请自行脑补。
- admin_user 管理员用户表， 关键字段( id, role_id )。
- t_role 角色表， 关键字段（ id, privilege_id ）。
- t_privilege 权限表， 关键字段（ id, url, method ）
三个表的关联关系就不用多说了吧，看字段一眼就能看出。
实现前分析
我们可以逆向思考：
要实现我们的需求，最关键的一步就是让Spring Security的AccessDecisionManager来判断所请求的url + httpmethod 是否符合我们数据库中的配置。然而，AccessDecisionManager并没有来判定类似需求的相关Voter， 因此，我们需要自定义一个Voter的实现（默认注册的AffirmativeBased的策略是只要有Voter投出ACCESS_GRANTED票，则判定为通过，这也正符合我们的需求）。实现voter后，有一个关键参数（Collection
总结一下思路步骤：
1.自定义voter实现。
2.自定义ConfigAttribute实现。
3.自定义SecurityMetadataSource实现。
4.Authentication包含用户实例（这个其实不用说，大家应该都已经这么做了）。
5.自定义GrantedAuthority实现。
项目实战
1.自定义GrantedAuthority实现
UrlGrantedAuthority.java
public class UrlGrantedAuthority implements GrantedAuthority {
private final String httpMethod;
private final String url;
public UrlGrantedAuthority(String httpMethod, String url) {
this.httpMethod = httpMethod;
this.url = url;
}
@Override
public String getAuthority() {
return url;
}
public String getHttpMethod() {
return httpMethod;
}
public String getUrl() {
return url;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
UrlGrantedAuthority target = (UrlGrantedAuthority) o;
if (httpMethod.equals(target.getHttpMethod()) && url.equals(target.getUrl())) return true;
return false;
}
@Override
public int hashCode() {
int result = httpMethod != null ? httpMethod.hashCode() : 0;
result = 31 * result + (url != null ? url.hashCode() : 0);
return result;
}
}
2.自定义认证用户实例
public class SystemUser implements UserDetails {
private final Admin admin;
private List<MenuOutput> menuOutputList;
private final List<GrantedAuthority> grantedAuthorities;
public SystemUser(Admin admin, List<AdminPrivilege> grantedPrivileges, List<MenuOutput> menuOutputList) {
this.admin = admin;
this.grantedAuthorities = grantedPrivileges.stream().map(it -> {
String method = it.getMethod() != null ? it.getMethod().getLabel() : null;
return new UrlGrantedAuthority(method, it.getUrl());
}).collect(Collectors.toList());
this.menuOutputList = menuOutputList;
}
@Override
public Collection<? extends GrantedAuthority> getAuthorities() {
return this.grantedAuthorities;
}
@Override
public String getPassword() {
return admin.getPassword();
}
@Override
public String getUsername() {
return null;
}
@Override
public boolean isAccountNonExpired() {
return true;
}
@Override
public boolean isAccountNonLocked() {
return true;
}
@Override
public boolean isCredentialsNonExpired() {
return true;
}
@Override
public boolean isEnabled() {
return true;
}
public Long getId() {
return admin.getId();
}
public Admin getAdmin() {
return admin;
}
public List<MenuOutput> getMenuOutputList() {
return menuOutputList;
}
public String getSalt() {
return admin.getSalt();
}
}
3.自定义UrlConfigAttribute实现
public class UrlConfigAttribute implements ConfigAttribute {
private final HttpServletRequest httpServletRequest;
public UrlConfigAttribute(HttpServletRequest httpServletRequest) {
this.httpServletRequest = httpServletRequest;
}
@Override
public String getAttribute() {
return null;
}
public HttpServletRequest getHttpServletRequest() {
return httpServletRequest;
}
}
4.自定义SecurityMetadataSource实现
public class UrlFilterInvocationSecurityMetadataSource implements FilterInvocationSecurityMetadataSource {
@Override
public Collection<ConfigAttribute> getAttributes(Object object) throws IllegalArgumentException {
final HttpServletRequest request = ((FilterInvocation) object).getRequest();
Set<ConfigAttribute> allAttributes = new HashSet<>();
ConfigAttribute configAttribute = new UrlConfigAttribute(request);
allAttributes.add(configAttribute);
return allAttributes;
}
@Override
public Collection<ConfigAttribute> getAllConfigAttributes() {
return null;
}
@Override
public boolean supports(Class<?> clazz) {
return FilterInvocation.class.isAssignableFrom(clazz);
}
}
5.自定义voter实现
public class UrlMatchVoter implements AccessDecisionVoter<Object> {
@Override
public boolean supports(ConfigAttribute attribute) {
if (attribute instanceof UrlConfigAttribute) return true;
return false;
}
@Override
public boolean supports(Class<?> clazz) {
return true;
}
@Override
public int vote(Authentication authentication, Object object, Collection<ConfigAttribute> attributes) {
if(authentication == null) {
return ACCESS_DENIED;
}
Collection<? extends GrantedAuthority> authorities = authentication.getAuthorities();
for (ConfigAttribute attribute : attributes) {
if (!(attribute instanceof UrlConfigAttribute)) continue;
UrlConfigAttribute urlConfigAttribute = (UrlConfigAttribute) attribute;
for (GrantedAuthority authority : authorities) {
if (!(authority instanceof UrlGrantedAuthority)) continue;
UrlGrantedAuthority urlGrantedAuthority = (UrlGrantedAuthority) authority;
if (StringUtils.isBlank(urlGrantedAuthority.getAuthority())) continue;
//如果数据库的method字段为null，则默认为所有方法都支持
String httpMethod = StringUtils.isNotBlank(urlGrantedAuthority.getHttpMethod()) ? urlGrantedAuthority.getHttpMethod()
: urlConfigAttribute.getHttpServletRequest().getMethod();
//用Spring已经实现的AntPathRequestMatcher进行匹配，这样我们数据库中的url也就支持ant风格的配置了（例如：/xxx/user/**）
AntPathRequestMatcher antPathRequestMatcher = new AntPathRequestMatcher(urlGrantedAuthority.getAuthority(), httpMethod);
if (antPathRequestMatcher.matches(urlConfigAttribute.getHttpServletRequest()))
return ACCESS_GRANTED;
}
}
return ACCESS_ABSTAIN;
}
}
6.自定义FilterSecurityInterceptor实现
public class UrlFilterSecurityInterceptor extends FilterSecurityInterceptor {
public UrlFilterSecurityInterceptor() {
super();
}
@Override
public void init(FilterConfig arg0) throws ServletException {
super.init(arg0);
}
@Override
public void destroy() {
super.destroy();
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
super.doFilter(request, response, chain);
}
@Override
public FilterInvocationSecurityMetadataSource getSecurityMetadataSource() {
return super.getSecurityMetadataSource();
}
@Override
public SecurityMetadataSource obtainSecurityMetadataSource() {
return super.obtainSecurityMetadataSource();
}
@Override
public void setSecurityMetadataSource(FilterInvocationSecurityMetadataSource newSource) {
super.setSecurityMetadataSource(newSource);
}
@Override
public Class<?> getSecureObjectClass() {
return super.getSecureObjectClass();
}
@Override
public void invoke(FilterInvocation fi) throws IOException, ServletException {
super.invoke(fi);
}
@Override
public boolean isObserveOncePerRequest() {
return super.isObserveOncePerRequest();
}
@Override
public void setObserveOncePerRequest(boolean observeOncePerRequest) {
super.setObserveOncePerRequest(observeOncePerRequest);
}
}
配置文件关键配置
<security:http>
...
<security:custom-filter ref="filterSecurityInterceptor" before="FILTER_SECURITY_INTERCEPTOR" />
</security:http>
<security:authentication-manager alias="authenticationManager">
<security:authentication-provider ref="daoAuthenticationProvider"/>
</security:authentication-manager>
<bean id="accessDecisionManager" class="org.springframework.security.access.vote.AffirmativeBased">
<constructor-arg>
<list>
<bean id="authenticatedVoter" class="org.springframework.security.access.vote.AuthenticatedVoter" />
<bean id="roleVoter" class="org.springframework.security.access.vote.RoleVoter" />
<bean id="urlMatchVoter" class="com.mobisist.app.security.access.voter.UrlMatchVoter" />
</list>
</constructor-arg>
</bean>
<bean id="securityMetadataSource" class="com.mobisist.app.security.access.UrlFilterInvocationSecurityMetadataSource" />
<bean id="filterSecurityInterceptor"
class="com.mobisist.app.security.access.UrlFilterSecurityInterceptor">
<property name="authenticationManager" ref="authenticationManager"/>
<property name="accessDecisionManager" ref="accessDecisionManager"/>
<property name="securityMetadataSource" ref="securityMetadataSource" />
</bean>
好啦，接下来享受你的Spring Security权限控制之旅吧。
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