java - Spring Session, Spring Security 如何在无权限拦截的url不自动创建session?

Question

我做了一个API服务器提供给手机端调用，用Spring Session连接Redis来做多台tomcat的session共享，用security来做API的权限拦截，并且使用了x-auth-token也就是header的token验证。现在遇到一个问题，有一些API是无权限验证的，但访问这些API时，spring会为每次request都创建session，返回一个新的x-auth-token，这样可能会导致session过多，请问如何配置才能让这种情况无需创建session呢？已经配置create-session="never"，但不管用。以下是security配置

<http realm="Protected API" use-expressions="true" auto-config="false"
        create-session="never" entry-point-ref="customAuthenticationEntryPoint">
        <intercept-url pattern="/auth/login/phone" access="permitAll()" />
        <intercept-url pattern="/**" access="isAuthenticated()" />
        <access-denied-handler ref="customAccessDeniedHandler" />
    </http>

spring session

<!-- 在HTTP的header中使用x-auth-token:來實現session -->
    <bean class="org.springframework.session.web.http.HeaderHttpSessionStrategy" />

<!-- This is essential to make sure that the Spring Security session registry
        is notified when the session is destroyed. -->
    <bean
        class="org.springframework.security.web.session.HttpSessionEventPublisher" />

    <bean class="org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration" scope="singleton">
        <!-- session为60分钟过期 -->
        <property name="maxInactiveIntervalInSeconds" value="${session.maxInactiveIntervalInSeconds}"></property>
    </bean>

...
省略redis pool配置

Answer 1

找到原因了，首先打开log的trace，然后trace org.springframework,这个时候可以看到每次创建新session时都会有日志，spring会打印session的创建栈

java.lang.RuntimeException: For debugging purposes only (not an error)
    at org.springframework.session.web.http.SessionRepositoryFilter$SessionRepositoryRequestWrapper.getSession(SessionRepositoryFilter.java:368)
    at org.springframework.session.web.http.SessionRepositoryFilter$SessionRepositoryRequestWrapper.getSession(SessionRepositoryFilter.java:390)
    at org.springframework.session.web.http.SessionRepositoryFilter$SessionRepositoryRequestWrapper.getSession(SessionRepositoryFilter.java:217)
    at javax.servlet.http.HttpServletRequestWrapper.getSession(HttpServletRequestWrapper.java:238)
    at xxx.xxxxxxxx.LogFilter.doFilterInternal(LogFilter.java:52)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:208)
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:177)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.springframework.session.web.http.SessionRepositoryFilter.doFilterInternal(SessionRepositoryFilter.java:167)
    at org.springframework.session.web.http.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:80)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

其中可以找到xxx.xxxx这行，LogFilter第52行查看代码发现调用了req.getSession(),虽然create-session配置了never，但若有代码调用req.getSession(),spring仍然会创建一个全新的session。尽量不要在filter等全局拦截器里调用req.getSession(),否则会随时创建一个新的session