package com.sinata.appointment.util;
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import java.nio.charset.StandardCharsets;
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import java.util.Base64;
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/**
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* 敏感字段占位处理：生产环境应替换为 KMS + 对称加密。
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*/
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public final class SensitiveDataUtil {
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private static final String PREFIX = "ENC:";
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private SensitiveDataUtil() {}
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public static String maskIdCard(String plain) {
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if (plain == null || plain.length() < 8) {
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return "****";
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}
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int starLen = plain.length() - 8;
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String stars = "*".repeat(Math.max(starLen, 1));
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return plain.substring(0, 4) + stars + plain.substring(plain.length() - 4);
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}
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public static String encryptIdCard(String plain) {
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if (plain == null || plain.isBlank()) {
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return null;
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}
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return PREFIX + Base64.getEncoder().encodeToString(plain.getBytes(StandardCharsets.UTF_8));
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}
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public static String decryptIdCard(String cipher) {
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if (cipher == null || cipher.isBlank()) {
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return null;
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}
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String t = cipher.trim();
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if (t.startsWith(PREFIX)) {
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String raw = t.substring(PREFIX.length());
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return new String(Base64.getDecoder().decode(raw), StandardCharsets.UTF_8);
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}
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return t;
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}
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}
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