mybatisplus，application.properties 配置数据库密码加密

package com.baomidou.samples.mybatisplus3.config;

import com.baomidou.dynamic.datasource.DynamicRoutingDataSource;
import com.baomidou.dynamic.datasource.aop.DynamicDataSourceAnnotationAdvisor;
import com.baomidou.dynamic.datasource.aop.DynamicDataSourceAnnotationInterceptor;
import com.baomidou.dynamic.datasource.aop.DynamicLocalTransactionAdvisor;
import com.baomidou.dynamic.datasource.processor.DsHeaderProcessor;
import com.baomidou.dynamic.datasource.processor.DsProcessor;
import com.baomidou.dynamic.datasource.processor.DsSessionProcessor;
import com.baomidou.dynamic.datasource.processor.DsSpelExpressionProcessor;
import com.baomidou.dynamic.datasource.provider.DynamicDataSourceProvider;
import com.baomidou.dynamic.datasource.provider.YmlDynamicDataSourceProvider;
import com.baomidou.dynamic.datasource.spring.boot.autoconfigure.DataSourceProperty;
import com.baomidou.dynamic.datasource.spring.boot.autoconfigure.DynamicDataSourceCreatorAutoConfiguration;
import com.baomidou.dynamic.datasource.spring.boot.autoconfigure.DynamicDataSourceHealthCheckConfiguration;
import com.baomidou.dynamic.datasource.spring.boot.autoconfigure.DynamicDataSourceProperties;
import com.baomidou.dynamic.datasource.spring.boot.autoconfigure.druid.DruidDynamicDataSourceConfiguration;
import com.sun.org.apache.xml.internal.security.utils.Base64;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.aop.Advisor;
import org.springframework.aop.aspectj.AspectJExpressionPointcut;
import org.springframework.aop.support.DefaultPointcutAdvisor;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.boot.autoconfigure.AutoConfigureBefore;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.Role;
import org.springframework.context.expression.BeanFactoryResolver;
import org.springframework.util.Base64Utils;

import javax.sql.DataSource;
import java.util.Map;

/**
 * overwrite DynamicDataSourceAutoConfiguration with DynamicDataSourceAutoConfig
 * @author Tony Xi
 * @since 2021-11-11
 */
@Configuration
@EnableConfigurationProperties({DynamicDataSourceProperties.class})
@AutoConfigureBefore(
        value = {DataSourceAutoConfiguration.class},
        name = {"com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceAutoConfigure"}
)
@Import({DruidDynamicDataSourceConfiguration.class, DynamicDataSourceCreatorAutoConfiguration.class, DynamicDataSourceHealthCheckConfiguration.class})
@ConditionalOnProperty(
        prefix = "spring.datasource.dynamic",
        name = {"enabled"},
        havingValue = "true",
        matchIfMissing = true
)
public class DynamicDataSourceAutoConfig {
    private static final Logger log = LoggerFactory.getLogger(com.baomidou.dynamic.datasource.spring.boot.autoconfigure.DynamicDataSourceAutoConfiguration.class);
    private final DynamicDataSourceProperties properties;

    @Bean
    @ConditionalOnMissingBean
    public DynamicDataSourceProvider dynamicDataSourceProvider() {
        Map<String, DataSourceProperty> datasourceMap = this.properties.getDatasource();
        return new YmlDynamicDataSourceProvider(datasourceMap);
    }

    @Bean
    @ConditionalOnMissingBean
    public DataSource dataSource(DynamicDataSourceProvider dynamicDataSourceProvider) {
        DynamicRoutingDataSource dataSource = new DynamicRoutingDataSource();

        dynamicDataSourceProvider.loadDataSources();
        dataSource.setPrimary(this.properties.getPrimary());
        dataSource.setStrict(this.properties.getStrict());
        dataSource.setStrategy(this.properties.getStrategy());
        dataSource.setProvider(dynamicDataSourceProvider);
        dataSource.setP6spy(this.properties.getP6spy());
        dataSource.setSeata(this.properties.getSeata());
        return dataSource;
    }

    @Role(2)
    @Bean
    public Advisor dynamicDatasourceAnnotationAdvisor(DsProcessor dsProcessor) {
        DynamicDataSourceAnnotationInterceptor interceptor = new DynamicDataSourceAnnotationInterceptor(this.properties.isAllowedPublicOnly(), dsProcessor);
        DynamicDataSourceAnnotationAdvisor advisor = new DynamicDataSourceAnnotationAdvisor(interceptor);
        advisor.setOrder(this.properties.getOrder().intValue());
        return advisor;
    }

    @Role(2)
    @ConditionalOnProperty(
            prefix = "spring.datasource.dynamic",
            name = {"seata"},
            havingValue = "false",
            matchIfMissing = true
    )
    @Bean
    public Advisor dynamicTransactionAdvisor() {
        AspectJExpressionPointcut pointcut = new AspectJExpressionPointcut();
        pointcut.setExpression("@annotation(com.baomidou.dynamic.datasource.annotation.DSTransactional)");
        return new DefaultPointcutAdvisor(pointcut, new DynamicLocalTransactionAdvisor());
    }

    @Bean
    @ConditionalOnMissingBean
    public DsProcessor dsProcessor(BeanFactory beanFactory) {
        DsHeaderProcessor headerProcessor = new DsHeaderProcessor();
        DsSessionProcessor sessionProcessor = new DsSessionProcessor();
        DsSpelExpressionProcessor spelExpressionProcessor = new DsSpelExpressionProcessor();
        spelExpressionProcessor.setBeanResolver(new BeanFactoryResolver(beanFactory));
        headerProcessor.setNextProcessor(sessionProcessor);
        sessionProcessor.setNextProcessor(spelExpressionProcessor);
        return headerProcessor;
    }

    /**
     * @author Tony Xi
     * @since 2021-11-11
     */
    public DynamicDataSourceAutoConfig(DynamicDataSourceProperties properties) {
        this.properties = properties;
        
        Map<String, DataSourceProperty> datasource = properties.getDatasource();

        for (Map.Entry<String, DataSourceProperty> entry : datasource.entrySet()) {
            DataSourceProperty dataSourceProperty = entry.getValue();
            String password = dataSourceProperty.getPassword();
            String username = dataSourceProperty.getUsername();
            System.out.println(entry.getKey() + " --> "+username+", raw password:　"+password+", after decode: "+password);
            if (password.trim().startsWith("en") || password.trim().startsWith("de")) {
                String tmp = password.substring(2);
                String pswd = new String(java.util.Base64.getDecoder().decode(tmp));
                dataSourceProperty.setPassword(pswd);
            }
        }
    }
    
    public static void main(String[] args) {
        String encodeToString = java.util.Base64.getEncoder().encodeToString("111".getBytes());
        System.out.println("en"+encodeToString);
    }

}