package com.welampiot.security;

import com.welampiot.service.impl.UserDetailsServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.ObjectPostProcessor;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.web.access.intercept.FilterSecurityInterceptor;
import org.springframework.security.web.authentication.AuthenticationFailureHandler;
import org.springframework.security.web.authentication.AuthenticationSuccessHandler;

import javax.annotation.Resource;

@Configuration
@EnableWebSecurity//开启Spring Security的功能
//prePostEnabled属性决定Spring Security在接口前注解是否可用@PreAuthorize,@PostAuthorize等注解,设置为true,会拦截加了这些注解的接口
@EnableGlobalMethodSecurity(prePostEnabled=true)
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
    @Autowired
    private UserDetailsService userDetailsService;
    @Resource
    private MD5PasswordEncoder md5PasswordEncoder;
    //登录成功处理逻辑
    @Autowired
    CustomizeAuthenticationSuccessHandler authenticationSuccessHandler;

    //登录失败处理逻辑
    @Autowired
    CustomizeAuthenticationFailureHandler authenticationFailureHandler;

    //权限拒绝处理逻辑
    @Autowired
    CustomizeAccessDeniedHandler accessDeniedHandler;

    //匿名用户访问无权限资源时的异常
    @Autowired
    CustomizeAuthenticationEntryPoint authenticationEntryPoint;

    //会话失效(账号被挤下线)处理逻辑
    @Autowired
    CustomizeSessionInformationExpiredStrategy sessionInformationExpiredStrategy;

    //登出成功处理逻辑
    @Autowired
    CustomizeLogoutSuccessHandler logoutSuccessHandler;

    //访问决策管理器
    @Autowired
    CustomizeAccessDecisionManager accessDecisionManager;

    //实现权限拦截
    @Autowired
    CustomizeFilterInvocationSecurityMetadataSource securityMetadataSource;

    @Autowired
    private CustomizeAbstractSecurityInterceptor securityInterceptor;

    @Bean
    public UserDetailsService userDetailsService() {
        //获取用户账号密码及权限信息
        return new UserDetailsServiceImpl();
    }

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(userDetailsService()).passwordEncoder(passwordEncoder());
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.cors().and().csrf().disable();
        http.authorizeRequests().antMatchers("/login").permitAll().anyRequest().authenticated().
//                antMatchers("/login").anonymous().
//                antMatchers("/**").fullyAuthenticated().
                        withObjectPostProcessor(new ObjectPostProcessor<FilterSecurityInterceptor>() {
                    @Override
                    public <O extends FilterSecurityInterceptor> O postProcess(O o) {
                        o.setAccessDecisionManager(accessDecisionManager);//决策管理器
                        o.setSecurityMetadataSource(securityMetadataSource);//安全元数据源
                        return o;
                    }
                }).
                //登出
                and().logout().logoutSuccessUrl("/logout").
//                permitAll().//允许所有用户
                logoutSuccessHandler(logoutSuccessHandler).//登出成功处理逻辑
                deleteCookies("JSESSIONID").//登出之后删除cookie
                //登入
                and().formLogin().loginProcessingUrl("/login").
//                permitAll().//允许所有用户
                successHandler(authenticationSuccessHandler).//登录成功处理逻辑
                failureHandler(authenticationFailureHandler).//登录失败处理逻辑
                //异常处理(权限拒绝、登录失效等)
                and().exceptionHandling().accessDeniedHandler(accessDeniedHandler).//权限拒绝处理逻辑
                authenticationEntryPoint(authenticationEntryPoint).//匿名用户访问无权限资源时的异常处理
                //会话管理
                and().sessionManagement().
                maximumSessions(1).//同一账号同时登录最大用户数
                expiredSessionStrategy(sessionInformationExpiredStrategy);//会话失效(账号被挤下线)处理逻辑
        http.addFilterBefore(securityInterceptor, FilterSecurityInterceptor.class);
    }

    /**
     * 指定加密方式
     */
    @Bean
    public PasswordEncoder passwordEncoder(){
        // 使用MD5加密密码
        return new MD5PasswordEncoder();
    }

}