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### SpringSecurity
- [SpringSecurity请求全过程解析](/docs/SpringSecurity/SpringSecurity请求全过程解析.md)
-
+- [SpringSecurity自定义用户认证](/docs/SpringSecurity/SpringSecurity自定义用户认证.md)
+-
## MyBatis
### 基础支持层
diff --git a/docs/SpringSecurity/SpringSecurity自定义用户认证.md b/docs/SpringSecurity/SpringSecurity自定义用户认证.md
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+# Spring Security自定义用户认证
+
+在**Spring Boot中开启Spring Security**一节中我们简单地搭建了一个Spring Boot + Spring Security的项目，其中登录页、用户名和密码都是由Spring Security自动生成的。Spring Security支持我们自定义认证的过程，如使用自定义的登录页替换默认的登录页，用户信息的获取逻辑、登录成功或失败后的处理逻辑等。这里将在上一节的源码基础上进行改造。
+
+## 配置自定义登录页
+
+为了方便起见，我们直接在src/main/resources/resources目录下创建一个login.html（不需要Controller跳转）：
+
+```
+
+
+
+
+ 登录
+
+
+
+
+
+
+```
+
+要怎么做才能让Spring Security跳转到我们自己定义的登录页面呢？很简单，只需要在BrowserSecurityConfig的configure中添加一些配置：
+
+```
+@Configuration
+public class BrowserConfig extends WebSecurityConfigurerAdapter {
+ @Override
+ protected void configure(HttpSecurity http) throws Exception {
+ http.formLogin() // 表单登录
+ .loginPage("/login.html") // 自定义登录页
+ .loginProcessingUrl("/login") // 登录认证路径
+ .and()
+ .authorizeRequests() // 授权配置
+ .antMatchers("/login.html", "/css/", "/error").permitAll() // 无需认证
+ .anyRequest().authenticated() // 除antMatchers中配置路径外其他所有请求都需要认证
+ .and().csrf().disable();
+ }
+}
+```
+
+上面代码中.loginPage("/login.html")指定了跳转到登录页面的请求URL，.loginProcessingUrl("/login")对应登录页面form表单的action="/login"，.antMatchers("/login.html", "/css/", "/error").permitAll()表示跳转到登录页面的请求不被拦截。
+
+这时候启动系统，访问http://localhost:8080/hello，会看到页面已经被重定向到了http://localhost:8080/login.html：
+
+
+
+## 源码解析
+
+### BrowserConfig配置解析
+
+我们首先来梳理下BrowserConfig中的配置是如何被Spring Security所加载的。
+
+首先找到调用BrowserConfig的configure()的地方，在其父类WebSecurityConfigurerAdapter的getHttp()中：
+
+
+
+往上一步找到调用getHttp()的地方，在同个类的init()中：
+
+
+
+往上一步找到调用init()的地方，在AbstractConfiguredSecurityBuilder的init()中：
+
+
+
+在init()被调用时，它首先会遍历getConfigurers()返回的集合中的元素，调用其init()，点击getConfigurers()查看，发现其读取的是configurers属性的值，那么configurers是什么时候被赋值的呢？我们在同个类的add()中找到configurers被赋值的代码：
+
+
+
+往上一步找到调用add()的地方，在同个类的apply()中：
+
+
+
+往上一步找到调用apply()的地方，在WebSecurityConfiguration的setFilterChainProxySecurityConfigurer()中：
+
+
+
+我们可以看到，在setFilterChainProxySecurityConfigurer()中，首先会实例化一个WebSecurity（AbstractConfiguredSecurityBuilder的实现类）的实例，遍历参数webSecurityConfigurers，将存储在其中的元素作为参数传递给WebSecurity的apply()，那么webSecurityConfigurers是什么时候被赋值的呢？我们根据@Value中的信息找到webSecurityConfigurers被赋值的地方，在AutowiredWebSecurityConfigurersIgnoreParents的getWebSecurityConfigurers()中：
+
+
+
+我们重点看第二句代码，可以看到这里会提取存储在bean工厂中类型为WebSecurityConfigurer.class的bean，而BrowserConfig正是WebSecurityConfigurerAdapter的实现类。
+
+解决完configurers的赋值问题，我们回到AbstractConfiguredSecurityBuilder的init()处，找到调用该方法的地方，在同个类的doBuild()中：
+
+
+
+往上一步找到调用doBuild()的地方，在AbstractSecurityBuilder的build()中：
+
+
+
+往上一步找到调用doBuild()的地方，在WebSecurityConfiguration的springSecurityFilterChain()中：
+
+
+
+至此，我们分析完了BrowserConfig被Spring Security加载的过程。现在我们再来看看当我们自定义的配置被加载完后，http各属性的变化，在BrowserConfig的configure()末尾打上断点，当程序走到断点处时，查看http属性：
+
+
+
+我们配置的.loginPage("/login.html")和.loginProcessingUrl("/login")在FormLoginConfigurer中：
+
+
+
+配置的.antMatchers("/login.html", "/css/", "/error").permitAll()在ExpressionUrlAuthorizationConfigurer中：
+
+
+
+这样，当我们访问除"/login.html", "/css/", "/error"以外的路径时，在AbstractSecurityInterceptor（FilterSecurityInterceptor的父类）的attemptAuthorization()中会抛出AccessDeniedException异常（最终由AuthenticationTrustResolverImpl的isAnonymous()进行判断）
+
+
+
+当我们访问"/login.html", "/css/", "/error"这几个路径时，在AbstractSecurityInterceptor（FilterSecurityInterceptor的父类）的attemptAuthorization()中正常执行（最终由SecurityExpressionRoot的permitAll()进行判断）
+
+
+
+### login.html路径解析
+
+当我们请求的资源需要经过认证时，Spring Security会将请求重定向到我们自定义的登录页，那么Spring又是如何找到我们自定义的登录页的呢？下面就让我们来解析一下：
+
+我们首先来到DispatcherServlet中，DispatcherServlet是Spring Web处理请求的入口。当Spring Web项目启动后，第一次接收到请求时，会调用其initStrategies()进行初始化：
+
+
+
+我们重点关注initHandlerMappings(context);这句，initHandlerMappings()用于初始化处理器映射器（处理器映射器可以根据请求找到对应的资源），我们来到initHandlerMappings()中：
+
+
+
+可以看到，当程序走到initHandlerMappings()中时，会从bean工厂中找出HandlerMapping.class类型的bean，将其存储到handlerMappings属性中。这里看到一共找到5个，分别是：requestMappingHandlerMapping（将请求与标注了@RequestMapping的方法进行关联）、weclomePageHandlerMapping（将请求与主页进行关联）、beanNameHandlerMapping（将请求与同名的bean进行关联）、routerFunctionMapping（将请求与RouterFunction进行关联）、resourceHandlerMapping（将请求与静态资源进行关联），这5个bean是在WebMvcAutoConfiguration$EnableWebMvcConfiguration中配置的：
+
+requestMappingHandlerMapping:
+
+
+
+resourceHandlerMapping:
+
+
+
+beanNameHandlerMapping、routerFunctionMapping、resourceHandlerMapping在EnableWebMvcConfiguration的父类（WebMvcConfigurationSupport）中配置：
+
+beanNameHandlerMapping:
+
+
+
+routerFunctionMapping:
+
+
+
+resourceHandlerMapping:
+
+
+
+我们将目光锁定在resourceHandlerMapping上，当resourceHandlerMapping被初始化时，会调用addResourceHandlers()为registry添加资源处理器，我们找到实际被调用的addResourceHandlers()，在DelegatingWebMvcConfiguration中：
+
+
+
+可以看到这里实际调用的是configurers属性的addResourceHandlers()，而configurers是一个final类型的成员变量，其值是WebMvcConfigurerComposite的实例，我们来到WebMvcConfigurerComposite中：
+
+
+
+可以看到这里实际调用的是delegates属性的addResourceHandlers()，delegates是一个final类型的集合，集合的元素由addWebMvcConfigurers()负责添加：
+
+
+
+我们找到调用addWebMvcConfigurers()的地方，在DelegatingWebMvcConfiguration的setConfigurers()中：
+
+
+
+可以看到当setConfigurers()被初始化时，Spring会往参数configurers中传入两个值，我们关注第一个值，是一个WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter的实例，注意它的属性resourceProperties，是一个WebProperties$Resources的实例，默认情况下，在实例化WebMvcAutoConfigurationAdapter时，由传入参数webProperties进行赋值：webProperties.getResources()：
+
+
+
+我们进入参数webProperties的类中，可以看到getResources()是直接实例化了一个Resources，其属性staticLocations是一个含有4个值的final类型的字符串数组，这4个值正是Spring寻找静态文件的地方：
+
+
+
+
+
+我们回到WebMvcAutoConfiguration的addResourceHandlers()中：
+
+
+
+在addResourceHandlers()中，会为registry添加两个资源处理器，当请求路径是“/webjars/”时，会在”classpath:/META-INF/resources/webjars/“路径下寻找对应的资源，当请求路径是“/**”时，会在”classpath:/META-INF/resources/“、”classpath:/resources/“、”classpath:/static/“、”classpath:/public/“路径下寻找对应的资源。
+
+现在我们通过访问http://localhost:8080/login.html来验证这个过程。
+
+请求首先来到DispatcherServlet的doDispatch()中，由于是对静态资源的请求，当程序走到mappedHandler = getHandler(processedRequest);时，通过getHandler()返回SimpleUrlHandlerMapping（即resourceHandlerMapping的类型）的HandlerExecutionChain：
+
+
+
+然后由实际的处理器进行处理：
+
+
+
+程序一路调试，来到ResourceHttpRequestHandler的handleRequest()中，通过调用Resource resource = getResource(request);找到请求对应的资源：
+
+
+
+而在getResource()中，实际是将请求路径（即login.html）与前面配置的路径进行拼接（组合成/resources/login.html这样的路径），再通过类加载器来寻找资源。
+
+后面源码深入过深，就不一一展开了，只截取其中比较重要的几段代码：
+
+PathResourceResolver中：
+
+
+
+
+
+ClassPathResource中：
+
+
+
+ClassLoader中：
+
+
+
+URLClassLoader中：
+
+
+
+最终，类加载器会在如上两个路径下找到登录页并返回。
+
+## 参考
+
+1. [Spring Security自定义用户认证](https://mrbird.cc/Spring-Security-Authentication.html)
+
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