如何设置过滤器以不处理所有请求？

问题描述 投票：0回答：1

我正在使用Spring Core，Spring MVC，Spring REST，JWT。

大家好！

我正在学习Spring Security，但是遇到了问题。

我想基于JWT进行身份验证；我有一个带有3种简单方法的Rest控制器：

第一种方法应适用于所有人，第二种方法仅适用于已登录的用户，第三种方法仅适用于管理员。尽管这可行，但我还有另一个问题。

问题是我的过滤器在启动后每次都抛出（不是直接的，因为null是由token = header.substring(7)返回的）），即使它尚未收到任何请求，它也会每次抛出NullPointerException（我可能是错的，我希望该代码将对其进行澄清）。是否可以设置过滤器以仅处理选定的请求，或者我的方法是错误的？

感谢您的帮助！

错误：

java.lang.NullPointerException
    at com.sample.config.JwtFilter.getAuthenticationByToken(JwtFilter.java:50)
    at com.sample.config.JwtFilter.doFilterInternal(JwtFilter.java:36)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
    at org.springframework.security.web.csrf.CsrfFilter.doFilterInternal(CsrfFilter.java:100)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
    at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:66)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
    at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215)
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:357)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:270)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:526)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:860)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1587)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.base/java.lang.Thread.run(Unknown Source)

我的JwtFilter：

public class JwtFilter extends BasicAuthenticationFilter {

    public JwtFilter(AuthenticationManager authenticationManager) {
        super(authenticationManager);

    }

    @Override   
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        String header=request.getHeader("authorization");
        UsernamePasswordAuthenticationToken authResult=getAuthenticationByToken(header);

        SecurityContextHolder.getContext().setAuthentication(authResult);

        chain.doFilter(request, response);
    }

    private UsernamePasswordAuthenticationToken getAuthenticationByToken(String header) {
            String token = header.substring(7);
            Jws<Claims> claims = Jwts.parser().setSigningKey("fQx]n}YmL)WuHjL".getBytes()).parseClaimsJws(token);

            String username=claims.getBody().get("name").toString();
            String role = claims.getBody().get("role").toString();
    return new UsernamePasswordAuthenticationToken(username,null,Collections.singleton(new SimpleGrantedAuthority(role)));      
    }

}

我的配置：


@Configuration
@EnableWebSecurity
public class SpringSecurityConfig extends WebSecurityConfigurerAdapter{

    @Override
    protected AuthenticationManager authenticationManager() throws Exception {
        return new AuthenticationManager() {

            @Override
            public Authentication authenticate(Authentication authentication) throws AuthenticationException {
                return null;
            }
        };
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests().antMatchers("/api/test2").authenticated()      .antMatchers("/api/test3").hasRole("ADMIN")
        .and()
        .addFilter(new JwtFilter(authenticationManager())); }
}

public class SpringSecurityWebInitializer extends AbstractSecurityWebApplicationInitializer{

}

控制器：


@RestController
@RequestMapping("/api")
public class TestApi {

    @GetMapping("/test1")
    public String test1()
    {
        return "test1";//for everyone
    }

    @GetMapping("/test2")
    public String test2()
    {
        return "test2";//only for logged in
    }

    @GetMapping("/test3")
    public String test3()
    {
        return "test3";//only for admins 
    }   
}
rest spring-mvc spring-security jwt spring-rest
1个回答
0
投票

您配置应用程序的方式，将为每个请求调用过滤器，因为安全性FilterChain“应用于”每个请求。

此行：

http.authorizeRequests()
        .antMatchers("/api/test2").authenticated()      
        .antMatchers("/api/test3").hasRole("ADMIN")
        ...

...不会阻止请求通过FilterChain。它仅允许匹配那些路径的请求通过过滤器而无需进行身份验证。但是您注册的每个过滤器（例如JwtFilter）都会被调用。

解决方案

您可以通过覆盖FilterChain中的configure(WebSecurity)方法来禁用某些请求的整个WebSecurityConfigurerAdapter：

@Override
public void configure(WebSecurity web) {
    web.ignoring().mvcMatchers(...);
}

但是在您的情况下，最好更改过滤器，以使其根据传入请求的路径跳过某些请求。您可以执行以下操作：

public class JwtFilter extends BasicAuthenticationFilter {
    private AntPathRequestMatcher filterPath;

    // the path you provide will restrict the filter to only be "applied"
    // to requests with that path
    public JwtFilter(AuthenticationManager authenticationManager, String path) {
        super(authenticationManager);
        this.filterPath = new AntPathRequestMatcher(path);
    }

    @Override   
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain)
            throws IOException, ServletException {

        // the filter will do nothing if the request doesn't match
        if(!filterPath.matches(request) {
            chain.doFilter(request, response);
        }

        // your filter logic goes here...

        chain.doFilter(request, response);
    }

    // ...
}
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