Spring Security 自定义短信登录认证的实现

自定义登录filter

上篇文章我们说到，对于用户的登录，security通过定义一个filter拦截login路径来实现的，所以我们要实现自定义登录，需要自己定义一个filter，继承abstractauthenticationprocessingfilter，从request中提取到手机号和验证码，然后提交给authenticationmanager：

public class smsauthenticationfilter extends abstractauthenticationprocessingfilter {
 public static final string spring_security_form_phone_key = "phone";
 public static final string spring_security_form_verify_code_key = "verifycode";
 private static final antpathrequestmatcher default_ant_path_request_matcher = new antpathrequestmatcher("/smslogin",
   "post");
 protected smsauthenticationfilter() {
  super(default_ant_path_request_matcher);
 }

 @override
 public authentication attemptauthentication(httpservletrequest request, httpservletresponse response) throws authenticationexception, ioexception, servletexception {
  string phone = request.getparameter(spring_security_form_phone_key);
  string verifycode = request.getparameter(spring_security_form_verify_code_key);
  if (stringutils.isblank(phone)){
   phone = "";
  }
  if (stringutils.isblank(verifycode)){
   verifycode = "";
  }
  smsauthenticationtoken authenticationtoken = new smsauthenticationtoken(phone, verifycode);
  setdetails(request,authenticationtoken);
  return getauthenticationmanager().authenticate(authenticationtoken);
 }

 protected void setdetails(httpservletrequest request, smsauthenticationtoken authrequest) {
  authrequest.setdetails(authenticationdetailssource.builddetails(request));
 }
}

其中smsauthenticationtoken参照usernamepasswordauthenticationtoken来实现：

public class smsauthenticationtoken extends abstractauthenticationtoken {
 private final object principal;
 private object credentials;

 public smsauthenticationtoken(object principal, object credentials) {
  super(null);
  this.principal = principal;
  this.credentials = credentials;
  //初始化完成，但是还未认证
  setauthenticated(false);
 }

 public smsauthenticationtoken(collection<? extends grantedauthority> authorities, object principal, object credentials) {
  super(authorities);
  this.principal = principal;
  this.credentials = credentials;
  setauthenticated(true);
 }

 @override
 public object getcredentials() {
  return credentials;
 }

 @override
 public object getprincipal() {
  return principal;
 }
}

自定义provider实现身份认证

我们知道authenticationmanager最终会委托给provider来实现身份验证，所以我们要判断验证码是否正确，需要自定义provider：

@slf4j
@component
public class smsauthenticationprovider implements authenticationprovider {
 @autowired
 private userdetailsservice userdetailsservice;

 @override
 public authentication authenticate(authentication authentication) {
  assert.isinstanceof(smsauthenticationtoken.class, authentication,
    () -> "smsauthenticationprovider.onlysupports only smsauthenticationtoken is supported");
  smsauthenticationtoken authenticationtoken = (smsauthenticationtoken) authentication;
  string phone = (string) authenticationtoken.getprincipal();
  string verifycode = (string) authenticationtoken.getcredentials();
  userdetails userdetails = userdetailsservice.loaduserbyusername(phone);
  if (userdetails == null){
   throw new internalauthenticationserviceexception("cannot get user info");
  }
  //验证码是否正确
  if (!stringutils.equals(cacheutil.getvalue(phone),verifycode)){
   throw new authenticationcredentialsnotfoundexception("验证码错误");
  }
  return new smsauthenticationtoken(userdetails.getauthorities(),userdetails,verifycode);
 }

 @override
 public boolean supports(class<?> authentication) {
  return authentication.isassignablefrom(smsauthenticationtoken.class);
 }
}

上面的cacheutil是封装的guava cache的实现，模拟发送验证码存储到内存中，在这个地方取出来做对比，如果对比失败就抛异常，对比成功就返回一个新的token，这个token中是包含了用户具有的权限的。

@slf4j
public class cacheutil {
 private static final loadingcache<string, string> cache = cachebuilder.newbuilder()
   //基于容量回收：总数量100个
   .maximumsize(100)
   //定时回收：没有写访问1分钟后失效清理
   .expireafterwrite(1, timeunit.minutes)
   //当在缓存中未找到所需的缓存项时，会执行cacheloader的load方法加载缓存
   .build(new cacheloader<string, string>() {
    @override
    public string load(string key) throws exception {
     log.debug("没有找到缓存: {}",key);
     return "";
    }
   });
 public static void putvalue(string key, string value){
  cache.put(key,value);
 }

 public static string getvalue(string key){
  try {
   return cache.get(key);
  } catch (executionexception e) {
   e.printstacktrace();
  }
  return "";
 }
}

身份认证结果回调

filter将手机号和验证码交给provider做验证，经过provider的校验，结果无非就两种，一种验证成功，一种验证失败，对于这两种不同的结果，我们需要实现两个handler，在获取到结果之后做回调。因为我们这儿只是简单的做url跳转，所以只需要继承simpleurlauthenticationsuccesshandler：

对于success的：

@component
public class smsauthsuccesshandler extends simpleurlauthenticationsuccesshandler {
 public smsauthsuccesshandler() {
  super("/index");
 }
}

对于failure的：

@component
public class smsauthfailurehandler extends simpleurlauthenticationfailurehandler {
 public smsauthfailurehandler() {
  super("/failure");
 }
}

上面整个登录流程的组件就完成了，接下来需要将它们整合起来。

整合登录组件

具体怎么整合，我们可以参考表单登录中，usernamepasswordauthenticationfilter是怎么整合进去的，回到配置类，还记得我们是怎么配置security的吗：

@configuration
public class securityconfig extends websecurityconfigureradapter {
 @override
 protected void configure(httpsecurity http) throws exception {
  http.formlogin()
    .loginpage("/login") //登录页面
    .successforwardurl("/index") //登录成功后的页面
    .failureforwardurl("/failure") //登录失败后的页面
    .and()
    // 设置url的授权
    .authorizerequests()
    // 这里需要将登录页面放行
    .antmatchers("/login")
    .permitall()
    //除了上面，其他所有请求必须被认证
    .anyrequest()
    .authenticated()
    .and()
    // 关闭csrf
    .csrf().disable();
 }
}

分析表单登录实现

看第一句，调用了http.formlogin()，在httpsecurity的formlogin方法定义如下：

public formloginconfigurer<httpsecurity> formlogin() throws exception {
 return getorapply(new formloginconfigurer<>());
}
private <c extends securityconfigureradapter<defaultsecurityfilterchain, httpsecurity>> c getorapply(c configurer)
 throws exception {
  //注意这个configure为securityconfigureradapter
 c existingconfig = (c) getconfigurer(configurer.getclass());
 if (existingconfig != null) {
 return existingconfig;
 }
 return apply(configurer);
}

apply方法为abstractconfiguredsecuritybuilder中的方法，我们目前先不关注它的实现，后面会仔细展开讲。现在只需要知道通过这个方法就能将configurer加入到security配置中。

这个地方添加了一个formloginconfigurer类，对于这个类官方给的解释为：

adds form based authentication. all attributes have reasonable defaults making all parameters are optional. if no #loginpage(string)} is specified, a default login page will be generated by the framework.

翻译过来就是：

添加基于表单的身份验证。所有属性都有合理的默认值，从而使所有参数都是可选的。如果未指定loginpage，则框架将生成一个默认的登录页面。

看一下它的构造方法：

public formloginconfigurer() {
 super(new usernamepasswordauthenticationfilter(), null);
 usernameparameter("username");
 passwordparameter("password");
}

发现usernamepasswordauthenticationfilter被传递给了父类，我们去它的父类abstractauthenticationfilterconfigurer看一下：

public abstract class abstractauthenticationfilterconfigurer<b extends httpsecuritybuilder<b>, t extends abstractauthenticationfilterconfigurer<b, t, f>, f extends abstractauthenticationprocessingfilter>
 extends abstracthttpconfigurer<t, b> {
 
 protected abstractauthenticationfilterconfigurer(f authenticationfilter, string defaultloginprocessingurl) {
 this();
  //这个filter就是usernamepasswordauthenticationfilter
 this.authfilter = authenticationfilter;
 if (defaultloginprocessingurl != null) {
 loginprocessingurl(defaultloginprocessingurl);
 }
 }
 
 @override
 public void configure(b http) throws exception {
 portmapper portmapper = http.getsharedobject(portmapper.class);
 if (portmapper != null) {
 this.authenticationentrypoint.setportmapper(portmapper);
 }
 requestcache requestcache = http.getsharedobject(requestcache.class);
 if (requestcache != null) {
 this.defaultsuccesshandler.setrequestcache(requestcache);
 }
  //通过getsharedobject获取共享对象。这里获取到authenticationmanager
 this.authfilter.setauthenticationmanager(http.getsharedobject(authenticationmanager.class));
  //设置成功和失败的回调
 this.authfilter.setauthenticationsuccesshandler(this.successhandler);
 this.authfilter.setauthenticationfailurehandler(this.failurehandler);
 if (this.authenticationdetailssource != null) {
 this.authfilter.setauthenticationdetailssource(this.authenticationdetailssource);
 }
 sessionauthenticationstrategy sessionauthenticationstrategy = http
 .getsharedobject(sessionauthenticationstrategy.class);
 if (sessionauthenticationstrategy != null) {
 this.authfilter.setsessionauthenticationstrategy(sessionauthenticationstrategy);
 }
 remembermeservices remembermeservices = http.getsharedobject(remembermeservices.class);
 if (remembermeservices != null) {
 this.authfilter.setremembermeservices(remembermeservices);
 }
 f filter = postprocess(this.authfilter);
  //添加filter
 http.addfilter(filter);
 }
}

可以看到这个地方主要做了三件事：

• 将authenticationmanager设置到filter中
• 添加成功/失败的回调
• 将过滤器添加到过滤器链中

仿照表单登录，实现配置类

仿照上面的三个步骤，我们可以自己实现一个配置类，查看abstractauthenticationfilterconfigurer的类继承关系：

它最上面的*父类为securityconfigureradapter，我们就继承它来实现我们基本的配置就行了（也可以继承abstracthttpconfigurer，没有歧视的意思），并且实现上面的三步：

@component
public class smsauthenticationsecurityconfig extends securityconfigureradapter<defaultsecurityfilterchain, httpsecurity> {
 @autowired
 private smsauthsuccesshandler smsauthsuccesshandler;
 @autowired
 private smsauthfailurehandler smsauthfailurehandler;
 @autowired
 private smsauthenticationprovider smsauthenticationprovider;
 @override
 public void configure(httpsecurity builder) throws exception {
  smsauthenticationfilter smsauthenticationfilter = new smsauthenticationfilter();
  smsauthenticationfilter.setauthenticationmanager(builder.getsharedobject(authenticationmanager.class));
  smsauthenticationfilter.setauthenticationsuccesshandler(smsauthsuccesshandler);
  smsauthenticationfilter.setauthenticationfailurehandler(smsauthfailurehandler);

  builder.authenticationprovider(smsauthenticationprovider);
  builder.addfilterafter(smsauthenticationfilter, usernamepasswordauthenticationfilter.class);
 }
}

和上面有一点不同，我们自定义的filter需要指定一下顺序，通过addfilterafter方法将我们的filter添加到过滤器链中，并且将自定义的provider也一并配置了进来。

添加配置到security中

这样我们的所有组件就已经组合到一起了，修改一下配置类：

@autowired
private smsauthenticationsecurityconfig smsauthenticationsecurityconfig;
@override
protected void configure(httpsecurity http) throws exception {
 http.formlogin()
  .loginpage("/login")
  .and()
  .apply(smsauthenticationsecurityconfig)
  .and()
  // 设置url的授权
  .authorizerequests()
  // 这里需要将登录页面放行
  .antmatchers("/login","/verifycode","/smslogin","/failure")
  .permitall()
  // anyrequest() 所有请求 authenticated() 必须被认证
  .anyrequest()
  .authenticated()
  .and()
  // 关闭csrf
  .csrf().disable();
}

再修改一下登录页面的登录接口和字段名：

<!doctype html>
<html lang="zh">
<head>
 <meta charset="utf-8">
 <title>login</title>
</head>
<body>
 <form action="/smslogin" method="post">
  <input type="text" name="phone"/>
  <input type="password" name="verifycode"/>
  <input type="submit" value="提交"/>
 </form>
</body>
</html>

这样通过短信验证码登录的功能就已经实现了。

建议大家可以自己重新实现一个自定义邮箱验证码登录，加深映像。

源码分析

configurer配置类工作原理

上面只是简单的使用，接下来我们分析configure是如何工作的。

大家注意自己要打开idea跟着过一遍源码

其实通过上面的配置我们可以发现，在security中的过滤器其实都是通过各种xxxconfigure来进行配置的，我们可以简单的理解为filter就是和配置类绑定在一起的。明白了这个概念，我们继续往下分析。
看上面abstractauthenticationfilterconfigurer的类继承关系图，从最上面开始分析，securitybuilder和securityconfigurer都是接口：

public interface securitybuilder<o> {
 /**
 * 构建一个对象并返回
 */
 o build() throws exception;
}
public interface securityconfigurer<o, b extends securitybuilder<o>> {
 /**
 * 初始化
 */
 void init(b builder) throws exception;
 void configure(b builder) throws exception;

}

securityconfigureradapter分析

上面两个接口的具体实现交给了securityconfigureradapter，在spring security中很多配置类都是继承自securityconfigureradapter来实现的。看一下实现类securityconfigureradapter的源码：

public abstract class securityconfigureradapter<o, b extends securitybuilder<o>> implements securityconfigurer<o, b> {

 private b securitybuilder;

 private compositeobjectpostprocessor objectpostprocessor = new compositeobjectpostprocessor();

 @override
 public void init(b builder) throws exception {
 }

 @override
 public void configure(b builder) throws exception {
 }

 /**
 * 返回securitybuilder，这样就可以进行链式调用了
 */
 public b and() {
 return getbuilder();
 }

 /**
 * 获取到securitybuilder
 */
 protected final b getbuilder() {
 assert.state(this.securitybuilder != null, "securitybuilder cannot be null");
 return this.securitybuilder;
 }

 /**
 * 执行对象的后置处理。默认值为委派给objectpostprocessor完成
 * @return 可使用的已修改对象
 */
 @suppresswarnings("unchecked")
 protected <t> t postprocess(t object) {
 return (t) this.objectpostprocessor.postprocess(object);
 }

 public void addobjectpostprocessor(objectpostprocessor<?> objectpostprocessor) {
 this.objectpostprocessor.addobjectpostprocessor(objectpostprocessor);
 }

 public void setbuilder(b builder) {
 this.securitybuilder = builder;
 }

 /**
 * objectpostprocessor的一个实现
 */
 private static final class compositeobjectpostprocessor implements objectpostprocessor<object> {
 private list<objectpostprocessor<?>> postprocessors = new arraylist<>();
 @override
 @suppresswarnings({ "rawtypes", "unchecked" })
 public object postprocess(object object) {
  //执行后置处理器的postprocess方法
 for (objectpostprocessor opp : this.postprocessors) {
 class<?> oppclass = opp.getclass();
 class<?> opptype = generictyperesolver.resolvetypeargument(oppclass, objectpostprocessor.class);
 if (opptype == null || opptype.isassignablefrom(object.getclass())) {
  object = opp.postprocess(object);
 }
 }
 return object;
 }
  //在list中添加了一个后置处理器
 private boolean addobjectpostprocessor(objectpostprocessor<?> objectpostprocessor) {
 boolean result = this.postprocessors.add(objectpostprocessor);
 this.postprocessors.sort(annotationawareordercomparator.instance);
 return result;
 }

 }
}

嗯。。。这两个方法都是空实现，应该是交给后面的子类去自己重写方法。多出来的内容就只是初始化了compositeobjectpostprocessor，并基于它封装了两个方法。

compositeobjectpostprocessor是objectpostprocessor的一个实现，objectpostprocessor实际上是一个后置处理器。
其次addobjectpostprocessor方法实际上就是在list中添加了一个后置处理器并排序。然后在postprocess方法中对这个list遍历，判断objectpostprocessor泛型类型和传过来的参数类型是否为父子关系，再次调用postprocess方法。

这个地方可能有点疑惑，为什么要再调用一次postprocess，这不就成递归了吗，我们注意一下compositeobjectpostprocessor类是private的，也就是只能在securityconfigureradapter内部使用，这里再次调用postprocess方法应该是其他的objectpostprocessor的实现。

可以看一下objectpostprocessor总共有两个实现，另外还有一个是autowirebeanfactoryobjectpostprocessor：

final class autowirebeanfactoryobjectpostprocessor
 implements objectpostprocessor<object>, disposablebean, smartinitializingsingleton {

 private final log logger = logfactory.getlog(getclass());

 private final autowirecapablebeanfactory autowirebeanfactory;

 private final list<disposablebean> disposablebeans = new arraylist<>();

 private final list<smartinitializingsingleton> smartsingletons = new arraylist<>();

 autowirebeanfactoryobjectpostprocessor(autowirecapablebeanfactory autowirebeanfactory) {
 assert.notnull(autowirebeanfactory, "autowirebeanfactory cannot be null");
 this.autowirebeanfactory = autowirebeanfactory;
 }

 @override
 @suppresswarnings("unchecked")
 public <t> t postprocess(t object) {
 if (object == null) {
 return null;
 }
 t result = null;
 try {
 result = (t) this.autowirebeanfactory.initializebean(object, object.tostring());
 }
 catch (runtimeexception ex) {
 class<?> type = object.getclass();
 throw new runtimeexception("could not postprocess " + object + " of type " + type, ex);
 }
 this.autowirebeanfactory.autowirebean(object);
 if (result instanceof disposablebean) {
 this.disposablebeans.add((disposablebean) result);
 }
 if (result instanceof smartinitializingsingleton) {
 this.smartsingletons.add((smartinitializingsingleton) result);
 }
 return result;
 }

 @override
 public void aftersingletonsinstantiated() {
 for (smartinitializingsingleton singleton : this.smartsingletons) {
 singleton.aftersingletonsinstantiated();
 }
 }

 @override
 public void destroy() {
 for (disposablebean disposable : this.disposablebeans) {
 try {
 disposable.destroy();
 }
 catch (exception ex) {
 this.logger.error(ex);
 }
 }
 }
}

这里面主要是通过autowirebeanfactory将对象注入到容器当中，在security中，很多对象都是new出来的，这些new出来的对象和容器没有任何关联，也不方便管理，所以通过autowirebeanfactoryobjectpostprocessor来完成对象的注入。

也就是说，在securityconfigureradapter中定义的这两个方法，其实就是将对象放进spring容器当中，方便管理。

abstractconfiguredsecuritybuilder分析

securityconfigureradapter的内容就这么多了，继续往下看abstracthttpconfigurer：

public abstract class abstracthttpconfigurer<t extends abstracthttpconfigurer<t, b>, b extends httpsecuritybuilder<b>>
 extends securityconfigureradapter<defaultsecurityfilterchain, b> {
 @suppresswarnings("unchecked")
 public b disable() {
 getbuilder().removeconfigurer(getclass());
 return getbuilder();
 }

 @suppresswarnings("unchecked")
 public t withobjectpostprocessor(objectpostprocessor<?> objectpostprocessor) {
 addobjectpostprocessor(objectpostprocessor);
 return (t) this;
 }
}

代码很少，第二个方法就是调用securityconfigureradapter的方法，这里主要看第一个disable方法，我们在配置类中就已经使用过了， 在禁用csrf的时候调用了 csrf().disable()，就是通过这个方法，将csrf的配置移除了。

继续看disable方法是调用了abstractconfiguredsecuritybuilder中的removeconfigurer方法，实际上就是移除linkedhashmap中的一个元素：

private final linkedhashmap<class<? extends securityconfigurer<o, b>>, list<securityconfigurer<o, b>>> configurers = new linkedhashmap<>();
public <c extends securityconfigurer<o, b>> list<c> removeconfigurers(class<c> clazz) {
 list<c> configs = (list<c>) this.configurers.remove(clazz);
 if (configs == null) {
 return new arraylist<>();
 }
 return new arraylist<>(configs);
 }

既然有移除的方法，那肯定就有添加的方法：

private final list<securityconfigurer<o, b>> configurersaddedininitializing = new arraylist<>();
private final map<class<?>, object> sharedobjects = new hashmap<>();
@suppresswarnings("unchecked")
private <c extends securityconfigurer<o, b>> void add(c configurer) {
 assert.notnull(configurer, "configurer cannot be null");
 class<? extends securityconfigurer<o, b>> clazz = (class<? extends securityconfigurer<o, b>>) configurer
  .getclass();
 synchronized (this.configurers) {
  if (this.buildstate.isconfigured()) {
   throw new illegalstateexception("cannot apply " + configurer + " to already built object");
  }
  list<securityconfigurer<o, b>> configs = null;
  if (this.allowconfigurersofsametype) {
   configs = this.configurers.get(clazz);
  }
  configs = (configs != null) ? configs : new arraylist<>(1);
  configs.add(configurer);
  this.configurers.put(clazz, configs);
  if (this.buildstate.isinitializing()) {
   this.configurersaddedininitializing.add(configurer);
  }
 }
}

我们自定义短信登录的时候，在配置类中添加自定义配置： .apply(smsauthenticationsecurityconfig)，这个apply方法实际上就是调用上面的方法，将配置添加了进去。

既然配置都添加到这个容器当中了，那什么时候取出来用呢：

private collection<securityconfigurer<o, b>> getconfigurers() {
 list<securityconfigurer<o, b>> result = new arraylist<>();
 for (list<securityconfigurer<o, b>> configs : this.configurers.values()) {
 result.addall(configs);
 }
 return result;
}
//执行所有configurer的初始化方法
private void init() throws exception {
 collection<securityconfigurer<o, b>> configurers = getconfigurers();
 for (securityconfigurer<o, b> configurer : configurers) {
  configurer.init((b) this);
 }
 for (securityconfigurer<o, b> configurer : this.configurersaddedininitializing) {
  configurer.init((b) this);
 }
}
//获取到所有的configure，遍历执行configure方法
private void configure() throws exception {
 //从linkedhashmap中获取到configurer
 collection<securityconfigurer<o, b>> configurers = getconfigurers();
 for (securityconfigurer<o, b> configurer : configurers) {
  configurer.configure((b) this);
 }
}

在init和configure方法中，调用了配置类的configure方法，到这里其实整个流程就已经通了。

我们一般自定义登录，都会实现这个configure方法，在这个方法里初始化一个filter，然后加入到过滤器链中。
而这个类的init和configure方法，实际上是在调用securitybuilder 的build方法被调用的，具体的代码链路就不说了，大家感兴趣的可以自己去看一下。

最后贴一下abstractconfiguredsecuritybuilder的所有代码(已精简)：

public abstract class abstractconfiguredsecuritybuilder<o, b extends securitybuilder<o>>
 extends abstractsecuritybuilder<o> {
 private final linkedhashmap<class<? extends securityconfigurer<o, b>>, list<securityconfigurer<o, b>>> configurers = new linkedhashmap<>();
 private final list<securityconfigurer<o, b>> configurersaddedininitializing = new arraylist<>();
 private final map<class<?>, object> sharedobjects = new hashmap<>();
 private final boolean allowconfigurersofsametype;
 private objectpostprocessor<object> objectpostprocessor;

 @suppresswarnings("unchecked")
 public <c extends securityconfigureradapter<o, b>> c apply(c configurer) throws exception {
 configurer.addobjectpostprocessor(this.objectpostprocessor);
 configurer.setbuilder((b) this);
 add(configurer);
 return configurer;
 }

 public <c extends securityconfigurer<o, b>> c apply(c configurer) throws exception {
 add(configurer);
 return configurer;
 }

 @suppresswarnings("unchecked")
 public <c> void setsharedobject(class<c> sharedtype, c object) {
 this.sharedobjects.put(sharedtype, object);
 }

 @suppresswarnings("unchecked")
 public <c> c getsharedobject(class<c> sharedtype) {
 return (c) this.sharedobjects.get(sharedtype);
 }

 /**
 * gets the shared objects
 * @return the shared objects
 */
 public map<class<?>, object> getsharedobjects() {
 return collections.unmodifiablemap(this.sharedobjects);
 }
 
 @suppresswarnings("unchecked")
 private <c extends securityconfigurer<o, b>> void add(c configurer) {
 assert.notnull(configurer, "configurer cannot be null");
 class<? extends securityconfigurer<o, b>> clazz = (class<? extends securityconfigurer<o, b>>) configurer
 .getclass();
 synchronized (this.configurers) {
 if (this.buildstate.isconfigured()) {
 throw new illegalstateexception("cannot apply " + configurer + " to already built object");
 }
 list<securityconfigurer<o, b>> configs = null;
 if (this.allowconfigurersofsametype) {
 configs = this.configurers.get(clazz);
 }
 configs = (configs != null) ? configs : new arraylist<>(1);
 configs.add(configurer);
 this.configurers.put(clazz, configs);
 if (this.buildstate.isinitializing()) {
 this.configurersaddedininitializing.add(configurer);
 }
 }
 }


 /**
 * 通过class name移除相关的配置类
 */
 @suppresswarnings("unchecked")
 public <c extends securityconfigurer<o, b>> list<c> removeconfigurers(class<c> clazz) {
 list<c> configs = (list<c>) this.configurers.remove(clazz);
 if (configs == null) {
 return new arraylist<>();
 }
 return new arraylist<>(configs);
 }

 /**
 * 通过class name移除相关的配置类
 */
 @suppresswarnings("unchecked")
 public <c extends securityconfigurer<o, b>> c removeconfigurer(class<c> clazz) {
 list<securityconfigurer<o, b>> configs = this.configurers.remove(clazz);
 if (configs == null) {
 return null;
 }
 assert.state(configs.size() == 1,
 () -> "only one configurer expected for type " + clazz + ", but got " + configs);
 return (c) configs.get(0);
 }

 @suppresswarnings("unchecked")
 public b objectpostprocessor(objectpostprocessor<object> objectpostprocessor) {
 assert.notnull(objectpostprocessor, "objectpostprocessor cannot be null");
 this.objectpostprocessor = objectpostprocessor;
 return (b) this;
 }

 protected <p> p postprocess(p object) {
 return this.objectpostprocessor.postprocess(object);
 }

 //执行所有configurer的初始化方法
 private void init() throws exception {
 collection<securityconfigurer<o, b>> configurers = getconfigurers();
 for (securityconfigurer<o, b> configurer : configurers) {
 configurer.init((b) this);
 }
 for (securityconfigurer<o, b> configurer : this.configurersaddedininitializing) {
 configurer.init((b) this);
 }
 }
 //获取到所有的configure，遍历执行configure方法
 private void configure() throws exception {
  //从linkedhashmap中获取到configurer
 collection<securityconfigurer<o, b>> configurers = getconfigurers();
 for (securityconfigurer<o, b> configurer : configurers) {
 configurer.configure((b) this);
 }
 }
 //执行钩子函数和configure方法
 protected final o dobuild() throws exception {
 synchronized (this.configurers) {
 this.buildstate = buildstate.initializing;
 beforeinit();
 init();
 this.buildstate = buildstate.configuring;
 beforeconfigure();
 configure();
 this.buildstate = buildstate.building;
 o result = performbuild();
 this.buildstate = buildstate.built;
 return result;
 }
 }
}

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