package jnpf.util;
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import java.util.regex.Pattern;
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/**
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* Privacy masking utilities for values returned to clients.
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*/
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public final class PrivacyMaskUtil {
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private static final Pattern MOBILE_PHONE_PATTERN = Pattern.compile("^1\\d{10}$");
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private static final Pattern MASKED_MOBILE_PHONE_PATTERN = Pattern.compile("^1\\d{2}\\*{4}\\d{4}$");
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private PrivacyMaskUtil() {
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}
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/**
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* Masks a mainland China mobile phone number as 138****5678.
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* Non-empty values in an unexpected format are fully masked to avoid leaking private data.
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*
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* @param mobilePhone mobile phone number
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* @return masked mobile phone number
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*/
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public static String maskMobilePhone(String mobilePhone) {
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if (mobilePhone == null || mobilePhone.trim().isEmpty()) {
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return mobilePhone;
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}
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if (MASKED_MOBILE_PHONE_PATTERN.matcher(mobilePhone).matches()) {
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return mobilePhone;
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}
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if (!MOBILE_PHONE_PATTERN.matcher(mobilePhone).matches()) {
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return "****";
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}
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return mobilePhone.substring(0, 3) + "****" + substringLastNumber(mobilePhone);
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}
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public static String substringLastNumber(String mobilePhone) {
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return substringLastNumber(mobilePhone, 4);
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}
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public static String substringLastNumber(String mobilePhone, int length) {
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if (mobilePhone == null) {
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return null;
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}
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if (length <= 0) {
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return mobilePhone;
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}
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return mobilePhone.substring(Math.max(0, mobilePhone.length() - length));
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}
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}
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