SpringBoot【集成 jasypt】实现配置信息自定义加解密（自定义的属性探测和密码解析器）

<!-- SpringBoot 版本 -->
<parent>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>2.5.3</version>
  <relativePath/> 
</parent>
<!-- jasypt 加密 -->
<dependency>
  <groupId>com.github.ulisesbocchio</groupId>
  <artifactId>jasypt-spring-boot-starter</artifactId>
  <version>3.0.3</version>
</dependency>

/**
 * 自定义的属性探测器和密码解析器
 */
@Component
public class CustomEncryptableProperty {
    @Bean(name = "encryptablePropertyDetector")
    public EncryptablePropertyDetector encryptablePropertyDetector() {
        return new CustomEncryptablePropertyDetector();
    }
    @Bean("encryptablePropertyResolver")
    public EncryptablePropertyResolver encryptablePropertyResolver(EncryptablePropertyDetector encryptablePropertyDetector) {
        return new CustomEncryptablePropertyResolver(encryptablePropertyDetector);
    }
}

/**
 * 自定义的属性探测器
 */
public class CustomEncryptablePropertyDetector implements EncryptablePropertyDetector {
    /**
     * 探测字符串
     */
    private final String flagStr = "ENC@";
    /**
     * 是否为可以解密的字符串【自定义规则为 flagStr 开头】
     *
     * @param value 全部的字符串
     * @return 是否是解密的字符串，true，是，false，否
     */
    @Override
    public boolean isEncrypted(String value) {
        if (value != null) {
            return value.startsWith(flagStr);
        }
        return false;
    }
    /**
     * 截取到除了标识之后的值【截取 flagStr 之后的字符串】
     *
     * @param value 带前缀
     * @return string 去掉标识符的字符串
     */
    @Override
    public String unwrapEncryptedValue(String value) {
        return value.substring(flagStr.length());
    }
}

/**
 * 自定义的密码解析器
 */
public class CustomEncryptablePropertyResolver implements EncryptablePropertyResolver {
    /**
     * 属性探测器
     */
    private final EncryptablePropertyDetector detector;
    public CustomEncryptablePropertyResolver(EncryptablePropertyDetector detector) {
        this.detector = detector;
    }
    /**
     * 处理真正的解密逻辑
     *
     * @param value 原始值
     * @return 如果值未加密，返回原值，如果加密，返回解密之后的值
     */
    @Override
    public String resolvePropertyValue(String value) {
        return Optional.ofNullable(value)
                .filter(detector::isEncrypted)
                .map(resolvedValue -> {
                    try {
                        // 1.过滤加密规则后的字符串
                        String unwrappedProperty = detector.unwrapEncryptedValue(resolvedValue.trim());
                        // 2.解密
                        return EncryptionUtil.toDecrypt(unwrappedProperty);
                    } catch (EncryptionOperationNotPossibleException e) {
                        throw new DecryptionException("Unable to decrypt: " + value + ". Decryption of Properties failed,  make sure encryption/decryption " +
                                "passwords match", e);
                    }
                })
                .orElse(value);
    }
}

spring:
  datasource:
    dynamic:
      datasource:
        # 主库数据源
        master:
          driver-class-name: org.postgresql.Driver
          url: ENC@URLENCStr
          username: ENC@UsernameENCStr
          password: ENC@PasswordENCStr