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server-node/src/auth/phoneNumber.ts

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+import { badRequest } from '../errors.js';
+
+export type NormalizedPhoneNumber = {
+  countryCode: string;
+  nationalNumber: string;
+  e164: string;
+  maskedNationalNumber: string;
+};
+
+function stripPhoneInput(input: string) {
+  return input.replace(/[^\d+]/gu, '').trim();
+}
+
+export function maskNationalPhoneNumber(phoneNumber: string) {
+  if (phoneNumber.length < 7) {
+    return phoneNumber;
+  }
+
+  return `${phoneNumber.slice(0, 3)}****${phoneNumber.slice(-4)}`;
+}
+
+export function normalizeMainlandChinaPhoneNumber(
+  phoneInput: string,
+): NormalizedPhoneNumber {
+  const trimmed = stripPhoneInput(phoneInput);
+  if (!trimmed) {
+    throw badRequest('请输入手机号');
+  }
+
+  let nationalNumber = trimmed;
+  if (nationalNumber.startsWith('+86')) {
+    nationalNumber = nationalNumber.slice(3);
+  } else if (nationalNumber.startsWith('86') && nationalNumber.length === 13) {
+    nationalNumber = nationalNumber.slice(2);
+  }
+
+  if (!/^1\d{10}$/u.test(nationalNumber)) {
+    throw badRequest('请输入正确的中国大陆手机号');
+  }
+
+  return {
+    countryCode: '86',
+    nationalNumber,
+    e164: `+86${nationalNumber}`,
+    maskedNationalNumber: maskNationalPhoneNumber(nationalNumber),
+  };
+}
+
+export function validateSmsVerifyCode(verifyCode: string) {
+  const normalizedVerifyCode = verifyCode.trim();
+  if (!/^[A-Za-z0-9]{4,8}$/u.test(normalizedVerifyCode)) {
+    throw badRequest('请输入正确的验证码');
+  }
+  return normalizedVerifyCode;
+}