security - 嵌入式 Glassfish、安全性和 Arquillian 问题

标签 security jakarta-ee glassfish-embedded jboss-arquillian

我想使用 Arquillian 在嵌入式 Glassfish 上测试我的 EJB。

重要的是我必须提高安全性,因为我的 bean 逻辑会执行一些程序化的安全检查 ( sessionContext.isCallerInRole(role) )。

是否可以在嵌入式 Glassfish 上使用 Arquillian 模拟登录?

如何设置嵌入式 Glassfish 以使用用户和角色属性文件?

[编辑]

我找到了一个我决定遵循的帖子(http://community.jboss.org/message/580290),但我仍然遇到问题。

1 我的 arquillian.xml没有被拿起
2 我收到有关 @Resource SessionContext 的警告
3 我无法获得正在运行的服务器的实例

src/test/resources/arquillian.xml:

<arquillian xmlns="http://jboss.com/arquillian" 
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns:glassfish="urn:arq:org.jboss.arquillian.container.glassfish.embedded_3">

    <glassfish:container>
        <glassfish:bindHttpPort>9090</glassfish:bindHttpPort>
        <glassfish:instanceRoot>src/test/glassfish</glassfish:instanceRoot>
        <glassfish:autoDelete>true</glassfish:autoDelete>
    </glassfish:container>

</arquillian>

我的测试:
@RunWith(Arquillian.class)
public class ArquillianTestCase {

    @Deployment
    public static JavaArchive createDeployment() {
        final JavaArchive jar = ShrinkWrap.create(JavaArchive.class, "test.jar")
                .addClasses(FileBrowser.class, FileBrowserBean.class).addAsResource("META-INF/ejb-jar.xml")
                .addAsResource("META-INF/glassfish-ejb-jar.xml");
        return jar;
    }

    @EJB
    private FileBrowser fileBrowser;

    @Test
    public void setupSecurity() throws Exception {
        GlassfishTestHelper.createFileUser("user1", "xxx", "role1");
    }

    @Test
    public void testLoadConfiguration() throws Exception {
        final boolean loggedIn = GlassfishTestHelper.loginFileUser("user1", "xxx");
        Assert.assertEquals(true, loggedIn);
        this.fileBrowser.loadConfiguration();
    }

我的登录助手类:
public final class GlassfishTestHelper {

    private GlassfishTestHelper() {
    }

    public static void createFileUser(final String username, final String password, final String groups) throws Exception {
        final Server server = Server.getServer(Server.getServerNames().get(0)); // NPE
        final String command = "create-file-user";
        final ParameterMap params = new ParameterMap();
        params.add("userpassword", password);
        params.add("groups", groups);
        params.add("username", username);
        final CommandRunner runner = server.getHabitat().getComponent(CommandRunner.class);
        final ActionReport report = server.getHabitat().getComponent(ActionReport.class);
        runner.getCommandInvocation(command, report).parameters(params).execute();

        if (report.getMessage() != null) {
            throw new Exception(String.format("Failed to create user : %s - message %s", username, report.getMessage()),
                report.getFailureCause());
        }
    }

    public static boolean loginFileUser(final String username, final String password) throws Exception {
        final ProgrammaticLogin login = new ProgrammaticLogin();
        return login.login(username, password.toCharArray(), "fileRealm", true);
    }
}

我的 EJB:
@Stateless
@Local(FileBrowser.class)
public class FileBrowserBean implements FileBrowser {

    @Resource
    private SessionContext sessionContext;

    @Override
    public Set<Application> loadConfiguration() throws FileBrowserException {
        // ...
    }
}

如果我运行测试,这是输出:
Running com.jnj.gtsc.services.filebrowser.ArquillianTestCase
18-Apr-2011 16:14:30 org.jboss.arquillian.impl.client.container.ContainerRegistryCreator getActivatedConfiguration
INFO: Could not read active container configuration: null
18-Apr-2011 16:14:31 com.sun.enterprise.v3.server.CommonClassLoaderServiceImpl findDerbyClient
INFO: Cannot find javadb client jar file, derby jdbc driver will not be available by default.
18-Apr-2011 16:14:31 org.hibernate.validator.util.Version <clinit>
INFO: Hibernate Validator null
18-Apr-2011 16:14:31 org.hibernate.validator.engine.resolver.DefaultTraversableResolver detectJPA
INFO: Instantiated an instance of org.hibernate.validator.engine.resolver.JPATraversableResolver.
18-Apr-2011 16:14:32 com.sun.enterprise.v3.services.impl.GrizzlyService createNetworkProxy
INFO: Network listener https-listener on port 0 disabled per domain.xml
18-Apr-2011 16:14:32 com.sun.enterprise.v3.server.AppServerStartup run
INFO: GlassFish Server Open Source Edition 3.1 (java_re-private) startup time : Embedded (655ms), startup services(395ms), total(1,050ms)
18-Apr-2011 16:14:32 com.sun.enterprise.v3.services.impl.GrizzlyProxy$2$1 onReady
INFO: Grizzly Framework 1.9.31 started in: 121ms - bound to [0.0.0.0:8181]
18-Apr-2011 16:14:32 org.glassfish.admin.mbeanserver.JMXStartupService$JMXConnectorsStarterThread run
INFO: JMXStartupService: JMXConnector system is disabled, skipping.
18-Apr-2011 16:14:33 com.sun.enterprise.security.SecurityLifecycle <init>
INFO: SEC1002: Security Manager is OFF.
18-Apr-2011 16:14:33 com.sun.enterprise.security.SecurityLifecycle onInitialization
INFO: SEC1010: Entering Security Startup Service
18-Apr-2011 16:14:33 com.sun.enterprise.security.PolicyLoader loadPolicy
INFO: SEC1143: Loading policy provider com.sun.enterprise.security.jacc.provider.SimplePolicyProvider.
18-Apr-2011 16:14:34 com.sun.enterprise.security.auth.realm.Realm doInstantiate
INFO: SEC1115: Realm [admin-realm] of classtype [com.sun.enterprise.security.auth.realm.file.FileRealm] successfully created.
18-Apr-2011 16:14:34 com.sun.enterprise.security.auth.realm.Realm doInstantiate
INFO: SEC1115: Realm [file] of classtype [com.sun.enterprise.security.auth.realm.file.FileRealm] successfully created.
18-Apr-2011 16:14:34 com.sun.enterprise.security.auth.realm.Realm doInstantiate
INFO: SEC1115: Realm [certificate] of classtype [com.sun.enterprise.security.auth.realm.certificate.CertificateRealm] successfully created.
18-Apr-2011 16:14:34 com.sun.enterprise.security.SecurityLifecycle onInitialization
INFO: SEC1011: Security Service(s) Started Successfully
18-Apr-2011 16:14:34 com.sun.enterprise.web.WebContainer createHttpListener
INFO: WEB0169: Created HTTP listener [http-listener] on host/port [0.0.0.0:8181]
18-Apr-2011 16:14:34 com.sun.enterprise.web.WebContainer createHosts
INFO: WEB0171: Created virtual server [server]
18-Apr-2011 16:14:34 com.sun.enterprise.web.WebContainer loadSystemDefaultWebModules
INFO: WEB0172: Virtual server [server] loaded default web module []
18-Apr-2011 16:14:35 org.glassfish.apf.impl.DefaultErrorHandler warning
WARNING: Incorrect @Resource annotation class definition - missing lookup attribute
 symbol: FIELD
 location: private javax.ejb.SessionContext com.jnj.gtsc.services.filebrowser.ejb.FileBrowserBean.sessionContext

18-Apr-2011 16:14:35 org.glassfish.apf.impl.DefaultErrorHandler warning
WARNING: Incorrect @Resource annotation class definition - missing lookup attribute
 symbol: FIELD
 location: private javax.ejb.SessionContext com.jnj.gtsc.services.filebrowser.ejb.FileBrowserBean.sessionContext

classLoader = WebappClassLoader (delegate=true; repositories=WEB-INF/classes/)
SharedSecrets.getJavaNetAccess()=java.net.URLClassLoader$7@720f6c
18-Apr-2011 16:14:35 com.sun.ejb.containers.BaseContainer initializeHome
INFO: Portable JNDI names for EJB FileBrowserBean : [java:global/test/FileBrowserBean!com.jnj.gtsc.services.filebrowser.ejb.FileBrowser, java:global/test/FileBrowserBean]
18-Apr-2011 16:14:36 com.sun.enterprise.web.WebApplication start
INFO: WEB0671: Loading application [test] at [/test]
18-Apr-2011 16:14:36 org.glassfish.deployment.admin.DeployCommand execute
PlainTextActionReporterSUCCESSDescription: deploy AdminCommandApplication deployed with name test.
INFO: test was successfully deployed in 2,845 milliseconds.
[name=test
18-Apr-2011 16:14:36 org.jboss.arquillian.testenricher.cdi.CDIInjectionEnricher injectClass
INFO: BeanManager cannot be located at java:comp/BeanManager. Either you are using an archive with no beans.xml, or the BeanManager has not been bound to that location in JNDI.
18-Apr-2011 16:14:36 org.jboss.arquillian.testenricher.cdi.CDIInjectionEnricher injectClass
INFO: BeanManager cannot be located at java:comp/BeanManager. Either you are using an archive with no beans.xml, or the BeanManager has not been bound to that location in JNDI.
18-Apr-2011 16:14:36 com.sun.appserv.security.ProgrammaticLogin login
SEVERE: SEC9050: Programmatic login failed
com.sun.enterprise.security.auth.login.common.LoginException: Login failed: Unable to locate a login configuration
    at com.sun.enterprise.security.auth.login.LoginContextDriver.doPasswordLogin(LoginContextDriver.java:394)
    at com.sun.enterprise.security.auth.login.LoginContextDriver.login(LoginContextDriver.java:240)
    at com.sun.enterprise.security.auth.login.LoginContextDriver.login(LoginContextDriver.java:153)
    at com.sun.appserv.security.ProgrammaticLogin$1.run(ProgrammaticLogin.java:174)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.appserv.security.ProgrammaticLogin.login(ProgrammaticLogin.java:168)
    at com.jnj.gtsc.services.filebrowser.util.GlassfishTestHelper.loginFileUser(GlassfishTestHelper.java:67)
    at com.jnj.gtsc.services.filebrowser.ArquillianTestCase.testLoadConfiguration(ArquillianTestCase.java:71)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
    at org.jboss.arquillian.junit.Arquillian$6$1.invoke(Arquillian.java:259)
    at org.jboss.arquillian.impl.execution.LocalTestExecuter.execute(LocalTestExecuter.java:63)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.jboss.arquillian.impl.core.ObserverImpl.invoke(ObserverImpl.java:90)
    at org.jboss.arquillian.impl.core.EventContextImpl.invokeObservers(EventContextImpl.java:98)
    at org.jboss.arquillian.impl.core.EventContextImpl.proceed(EventContextImpl.java:80)
    at org.jboss.arquillian.impl.core.ManagerImpl.fire(ManagerImpl.java:126)
    at org.jboss.arquillian.impl.core.ManagerImpl.fire(ManagerImpl.java:106)
    at org.jboss.arquillian.impl.core.EventImpl.fire(EventImpl.java:67)
    at org.jboss.arquillian.impl.execution.ContainerTestExecuter.execute(ContainerTestExecuter.java:38)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.jboss.arquillian.impl.core.ObserverImpl.invoke(ObserverImpl.java:90)
    at org.jboss.arquillian.impl.core.EventContextImpl.invokeObservers(EventContextImpl.java:98)
    at org.jboss.arquillian.impl.core.EventContextImpl.proceed(EventContextImpl.java:80)
    at org.jboss.arquillian.impl.TestContextHandler.createTestContext(TestContextHandler.java:82)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.jboss.arquillian.impl.core.ObserverImpl.invoke(ObserverImpl.java:90)
    at org.jboss.arquillian.impl.core.EventContextImpl.proceed(EventContextImpl.java:87)
    at org.jboss.arquillian.impl.TestContextHandler.createClassContext(TestContextHandler.java:68)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.jboss.arquillian.impl.core.ObserverImpl.invoke(ObserverImpl.java:90)
    at org.jboss.arquillian.impl.core.EventContextImpl.proceed(EventContextImpl.java:87)
    at org.jboss.arquillian.impl.TestContextHandler.createSuiteContext(TestContextHandler.java:54)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.jboss.arquillian.impl.core.ObserverImpl.invoke(ObserverImpl.java:90)
    at org.jboss.arquillian.impl.core.EventContextImpl.proceed(EventContextImpl.java:87)
    at org.jboss.arquillian.impl.core.ManagerImpl.fire(ManagerImpl.java:126)
    at org.jboss.arquillian.impl.EventTestRunnerAdaptor.test(EventTestRunnerAdaptor.java:101)
    at org.jboss.arquillian.junit.Arquillian$6.evaluate(Arquillian.java:251)
    at org.jboss.arquillian.junit.Arquillian$4.evaluate(Arquillian.java:214)
    at org.jboss.arquillian.junit.Arquillian.multiExecute(Arquillian.java:303)
    at org.jboss.arquillian.junit.Arquillian.access$300(Arquillian.java:45)
    at org.jboss.arquillian.junit.Arquillian$5.evaluate(Arquillian.java:228)
    at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
    at org.jboss.arquillian.junit.Arquillian$2.evaluate(Arquillian.java:173)
    at org.jboss.arquillian.junit.Arquillian.multiExecute(Arquillian.java:303)
    at org.jboss.arquillian.junit.Arquillian.access$300(Arquillian.java:45)
    at org.jboss.arquillian.junit.Arquillian$3.evaluate(Arquillian.java:187)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
    at org.jboss.arquillian.junit.Arquillian.run(Arquillian.java:127)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:136)
    at org.jboss.arquillian.junit.JUnitTestRunner.execute(JUnitTestRunner.java:69)
    at org.jboss.arquillian.protocol.servlet.runner.ServletTestRunner.doGet(ServletTestRunner.java:84)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:735)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1534)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98)
    at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:326)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:227)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:170)
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:822)
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:719)
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1013)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
    at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.SecurityException: Unable to locate a login configuration
    at com.sun.security.auth.login.ConfigFile.<init>(ConfigFile.java:93)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at java.lang.Class.newInstance0(Class.java:355)
    at java.lang.Class.newInstance(Class.java:308)
    at javax.security.auth.login.Configuration$3.run(Configuration.java:247)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.login.Configuration.getConfiguration(Configuration.java:242)
    at javax.security.auth.login.LoginContext$1.run(LoginContext.java:237)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.login.LoginContext.init(LoginContext.java:234)
    at javax.security.auth.login.LoginContext.<init>(LoginContext.java:367)
    at javax.security.auth.login.LoginContext.<init>(LoginContext.java:444)
    at com.sun.enterprise.security.auth.login.LoginContextDriver.doPasswordLogin(LoginContextDriver.java:381)
    ... 107 more
Caused by: java.io.IOException: Unable to locate a login configuration
    at com.sun.security.auth.login.ConfigFile.init(ConfigFile.java:250)
    at com.sun.security.auth.login.ConfigFile.<init>(ConfigFile.java:91)
    ... 122 more
classLoader = WebappClassLoader (delegate=true; repositories=WEB-INF/classes/)
SharedSecrets.getJavaNetAccess()=java.net.URLClassLoader$7@720f6c
PlainTextActionReporterSUCCESSNo monitoring data to report.

最佳答案

Glassfish 独立实例配置可与 Arquillian GlassFish Embedded 容器适配器一起使用。您需要在测试中检查安全性,因此您必须先准备好 GlassFish 实例配置。这也可以通过编程配置来实现(请参阅 https://stackoverflow.com/a/20411981/2169124 ),但对我来说,测试资源中的配置看起来更自然。要在文件领域(默认使用)中配置用户,您需要:

  • 安装独立的 Glassfish 服务器;
  • 使用 asadmin 命令启动 Glassfish 实例:
    $GLASSFISH_HOME/bin/asadmin start-domain
    
  • 使用 asadmin 命令将用户添加到文件领域(存储在名为 keyfile 的文件中):
    $GLASSFISH_HOME/bin/asadmin create-file-user --user username
    
  • 复制文件夹
    $GLASSFISH_HOME/glassfish/domains/domain1/config
    $GLASSFISH_HOME/glassfish/domains/domain1/docroot
    

    测试资源(例如 src/test/resources/domain,假设您使用的是 maven)
  • 在 arquillian.xml 中定义 glassfish 配置的路径(它将被 maven 复制到 target/test-classes/domain):
    <?xml version="1.0" encoding="UTF-8"?>
    <arquillian xmlns="http://jboss.org/schema/arquillian"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="
        http://jboss.org/schema/arquillian
        http://jboss.org/schema/arquillian/arquillian_1_0.xsd">
    <container qualifier="glassfish-embedded" default="true">
        <configuration>
            <property name="instanceRoot">target/test-classes/domain</property>
        </configuration>
    </container>
    

  • 将用户映射到 glassfish-application.xml 中的角色:
    <?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE glassfish-application PUBLIC "-//GlassFish.org//DTD GlassFish Application Server 3.1 Java EE Application 6.0//EN" "http://glassfish.org/dtds/glassfish-application_6_0-1.dtd">
    <glassfish-application>
        <security-role-mapping>
            <role-name>admin</role-name>
            <principal-name>username</principal-name>
        </security-role-mapping>
    </glassfish-application>
    
  • 将 glassfish-application.xml 添加到测试工件:
    ShrinkWrap.create(EnterpriseArchive.class)
            .addAsModule(ejbJar)
            .addAsManifestResource(new File("src/test/resources/glassfish-application.xml"))
    
  • 在测试方法中使用 ProgrammaticLogin 来处理身份验证:
    ProgrammaticLogin programmaticLogin = new ProgrammaticLogin();
    programmaticLogin.login("username", "password");
    
  • 关于security - 嵌入式 Glassfish、安全性和 Arquillian 问题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/5701679/

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