Spring Security动态权限管理（基于Spring Boot 2.x 前后端分离）

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• Spring Security核心配置入口

@Configuration
@EnableGlobalMethodSecurity(prePostEnabled=true)
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

    ...

    @Autowired
    private MyFilterSecurityInterceptor myFilterSecurityInterceptor;

    @Override
    protected void configure(HttpSecurity http) throws Exception {

        ...

        registry.and()
                ...
                //自定义权限拒绝处理类
                .exceptionHandling().accessDeniedHandler(accessDeniedHandler)
    }
}

• 权限管理过滤器 监控用户行为

@Component
public class MyFilterSecurityInterceptor extends AbstractSecurityInterceptor implements Filter {

    @Autowired
    private FilterInvocationSecurityMetadataSource securityMetadataSource;

    @Autowired
    public void setMyAccessDecisionManager(MyAccessDecisionManager myAccessDecisionManager) {
        super.setAccessDecisionManager(myAccessDecisionManager);
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {

        FilterInvocation fi = new FilterInvocation(request, response, chain);
        invoke(fi);
    }

    public void invoke(FilterInvocation fi) throws IOException, ServletException {

        InterceptorStatusToken token = super.beforeInvocation(fi);
        try {
            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;
    }
}

• 权限管理决断器 判断用户拥有的权限或角色是否有资源访问权限

@Component
public class MyAccessDecisionManager implements AccessDecisionManager {

    @Override
    public void decide(Authentication authentication, Object o, Collection<ConfigAttribute> configAttributes) throws AccessDeniedException, InsufficientAuthenticationException {

        if(configAttributes==null){
            return;
        }
        Iterator<ConfigAttribute> iterator = configAttributes.iterator();
        while (iterator.hasNext()){
            ConfigAttribute c = iterator.next();
            String needPerm = c.getAttribute();
            for(GrantedAuthority ga : authentication.getAuthorities()) {
                // 匹配用户拥有的ga 和 系统中的needPerm
                if(needPerm.trim().equals(ga.getAuthority())) {
                    return;
                }
            }
        }
        throw new AccessDeniedException("抱歉，您没有访问权限");
    }

    @Override
    public boolean supports(ConfigAttribute configAttribute) {
        return true;
    }

    @Override
    public boolean supports(Class<?> aClass) {
        return true;
    }
}

• 权限资源管理器 为权限决断器提供支持

@Component
public class MySecurityMetadataSource implements FilterInvocationSecurityMetadataSource {

    @Autowired
    private PermissionService permissionService;

    private Map<String, Collection<ConfigAttribute>> map = null;

    /**
     * 加载权限表中所有操作请求权限
     */
    public void loadResourceDefine(){

        map = new HashMap<>(16);
        Collection<ConfigAttribute> configAttributes;
        ConfigAttribute cfg;
        // 获取启用的权限操作请求
        List<Permission> permissions = permissionService.findByTypeAndStatusOrderBySortOrder(CommonConstant.PERMISSION_OPERATION, CommonConstant.STATUS_NORMAL);
        for(Permission permission : permissions) {
            if(StrUtil.isNotBlank(permission.getTitle())&&StrUtil.isNotBlank(permission.getPath())){
                configAttributes = new ArrayList<>();
                cfg = new SecurityConfig(permission.getTitle());
                //作为MyAccessDecisionManager类的decide的第三个参数
                configAttributes.add(cfg);
                //用权限的path作为map的key，用ConfigAttribute的集合作为value
                map.put(permission.getPath(), configAttributes);
            }
        }
    }

    /**
     * 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
     * @param o
     * @return
     * @throws IllegalArgumentException
     */
    @Override
    public Collection<ConfigAttribute> getAttributes(Object o) throws IllegalArgumentException {

        if(map == null){
            loadResourceDefine();
        }
        //Object中包含用户请求request
        String url = ((FilterInvocation) o).getRequestUrl();
        PathMatcher pathMatcher = new AntPathMatcher();
        Iterator<String> iterator = map.keySet().iterator();
        while (iterator.hasNext()) {
            String resURL = iterator.next();
            if (StrUtil.isNotBlank(resURL)&&pathMatcher.match(resURL,url)) {
                return map.get(resURL);
            }
        }
        return null;
    }

    @Override
    public Collection<ConfigAttribute> getAllConfigAttributes() {
        return null;
    }

    @Override
    public boolean supports(Class<?> aClass) {
        return true;
    }
}

• 每次编辑权限信息后刷新内存中的系统权限信息

@Autowired
private MySecurityMetadataSource mySecurityMetadataSource;

//重新加载权限
mySecurityMetadataSource.loadResourceDefine();