SpringSecurity實現(xiàn)動態(tài)加載權限信息的方法

更新時間：2022年01月05日 14:50:44 作者：MMM_Demon

這篇文章主要介紹了SpringSecurity實現(xiàn)動態(tài)加載權限信息,本文給大家介紹的非常詳細，對大家的學習或工作具有一定需要的朋友可以參考下

①數(shù)據(jù)庫中資源與角色對應關系，以及角色和用戶對應關系如下圖所示：

②實現(xiàn)FilterInvocationSecurityMetadataSource類

(1)List<Menu> menus = menuService.getMenusWithRoles();這個是你自己的資源對應角色的查詢方法。

(2)重寫的support方法都返回true

@Configuration
public class MyFilterInvocation implements FilterInvocationSecurityMetadataSource {
 
    @Autowired
    private MenuService menuService;
 
    AntPathMatcher antPathMatcher = new AntPathMatcher();
 
    @Override
    public Collection<ConfigAttribute> getAttributes(Object object) throws IllegalArgumentException {
        String requestUrl = ((FilterInvocation) object).getRequestUrl();
        List<Menu> menus = menuService.getMenusWithRoles();
        //- 遍歷數(shù)據(jù)庫的url，看請求路徑是否與其匹配
        for (Menu menu : menus) {
            //- 如果請求路徑和數(shù)據(jù)庫的路徑匹配
            if (antPathMatcher.match(menu.getUrl(),requestUrl)){
                //- 訪問該路徑需要的角色
                List<Role> roles = menu.getRoles();
                String[] strs = new String[roles.size()];
                for (int i = 0; i < roles.size(); i++) {
                    strs[i] = roles.get(i).getName();
                }
                return SecurityConfig.createList(strs);
            }
        }
        //- 如果請求路徑和數(shù)據(jù)庫的所有路徑都不匹配，說明這個資源是登錄后即可訪問的
        //- 用戶登錄即可訪問,相當于在SecurityConfig中配置了.anyRequest().authenticated()
        return SecurityConfig.createList("ROLE_LOGIN");
    }
 
    @Override
    public Collection<ConfigAttribute> getAllConfigAttributes() {
        return null;
    }
 
    @Override
    public boolean supports(Class<?> clazz) {
        return true;
    }
}

③實現(xiàn)AccessDecisionManager類

重寫的support方法都返回true

@Configuration
public class MyDecisionManager implements AccessDecisionManager {
 
 
    @Override
    public void decide(Authentication authentication, Object object, Collection<ConfigAttribute> configAttributes) throws AccessDeniedException, InsufficientAuthenticationException {
        for (ConfigAttribute configAttribute : configAttributes) {
            String needRole = configAttribute.getAttribute();
            if ("ROLE_LOGIN".equals(needRole)) {
                //- 用戶登錄即可訪問,相當于在SecurityConfig中配置了.anyRequest().authenticated()
                if (authentication instanceof AnonymousAuthenticationToken) {
                    throw new AccessDeniedException("尚未登錄，請先登錄");
                } else {
                    return;
                }
            }
            
            Collection<? extends GrantedAuthority> authorities = authentication.getAuthorities();
            //這里我寫的是只要訪問該資源的用戶具有`訪問該資源所需要角色`的其中一個即可
            for (GrantedAuthority authority : authorities) {
                if (authority.getAuthority().equals(needRole)) {
                    return;
                }
            }
        }
        throw new AccessDeniedException("權限不足，請聯(lián)系管理員");
    }
 
    @Override
    public boolean supports(ConfigAttribute attribute) {
        return true;
    }
 
    @Override
    public boolean supports(Class<?> clazz) {
        return true;
    }
}

④到SecurityConfig配置類中完成相應配置

    @Autowired
    private MyDecisionManager myDecisionManager;
    
    @Autowired
    private  MyFilterInvocation myFilterInvocation;
 
     @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests()
                .withObjectPostProcessor(new ObjectPostProcessor<FilterSecurityInterceptor>() {
                    @Override
                    public <O extends FilterSecurityInterceptor> O postProcess(O object) {
                        object.setAccessDecisionManager(myDecisionManager);
                        object.setSecurityMetadataSource(myFilterInvocation);
                        return object;
                    }
                });
 
            http.exceptionHandling().accessDeniedHandler(myAccessDeniedHandler());
 
    }
 
 
    @Bean
    MyAccessDeniedHandler myAccessDeniedHandler(){
        return new MyAccessDeniedHandler();
    }

⑤可選，實現(xiàn)AccessDeniedHandler類

public class MyAccessDenied implements AccessDeniedHandler {
 
    @Override
    public void handle(HttpServletRequest req, HttpServletResponse resp, AccessDeniedException accessDeniedException) throws IOException, ServletException {
        resp.setContentType("application/json;charset=utf-8");
        PrintWriter pw = resp.getWriter();
        pw.write(new ObjectMapper().writeValueAsString(RespBean.error("權限不夠，請聯(lián)系管理員")));
        pw.flush();
        pw.close();
    }
}

到此這篇關于SpringSecurity實現(xiàn)動態(tài)加載權限信息的文章就介紹到這了,更多相關SpringSecurity動態(tài)加載權限內容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關文章希望大家以后多多支持腳本之家！

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