上篇《Spring Security权限管理（源码）杂谈》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 attributes），ConfigAttribute根据不同的情况，所代表的语义不一样。我们在此也需要实现。然而，Collection attributes参数由SecurityMetadataSource获取，因此，我们还应该实现SecurityMetadataSource。众所周知，在Spring Security中，当前用户认证信息都是通过Authentication表示，因此，我们还应该让Authentication包含用户（admin）实例。Authentication同时还包含了用户的权限信息（GrantedAuthority）， 因此还应该实现GrantedAuthority。
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。
更多Spring Security相关教程见以下内容：
Spring Security 学习笔记 http://www.xuebuyuan.com/Linux/2016-10/135820.htm
Spring Security3.1高级详细开发指南 PDF http://www.xuebuyuan.com/Linux/2016-05/131482.htm
Spring Security 学习之数据库认证http://www.xuebuyuan.com/Linux/2014-02/97407.htm
Spring Security 学习之LDAP认证http://www.xuebuyuan.com/Linux/2014-02/97406.htm
Spring Security 学习之OpenID认证http://www.xuebuyuan.com/Linux/2014-02/97405.htm
Spring Security 学习之X.509认证http://www.xuebuyuan.com/Linux/2014-02/97404.htm
Spring Security 学习之HTTP基本认证和HTTP摘要认证http://www.xuebuyuan.com/Linux/2014-02/97403.htm
Spring Security 学习之HTTP表单验证http://www.xuebuyuan.com/Linux/2014-02/97402.htm
Spring Security异常之You must provide a configuration attribute http://www.xuebuyuan.com/Linux/2015-02/113364.htm
Spring Security 的详细介绍：请点这里Spring Security 的下载地址：请点这里
本文永久更新链接地址：http://www.xuebuyuan.com/Linux/2016-12/138096.htm
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