feat: align with upstream 1.5.9.9

server/utils/register-validation.ts

@@ -0,0 +1,35 @@
+// 注册相关校验纯函数（本地注册与 OAuth 注册共用）
+
+export const REMARK_MAX_LENGTH = 200
+
+const hasText = (value: unknown): boolean => typeof value === 'string' && value.trim().length > 0
+
+// 年级与班级必须成对填写，或全部留空
+export const validateGradeClassPair = (
+  grade: unknown,
+  studentClass: unknown
+): { code: string; message: string } | null => {
+  if (hasText(grade) !== hasText(studentClass)) {
+    return { code: 'AUTH_GRADE_CLASS_TOGETHER', message: '年级和班级需要同时选择，或全部留空' }
+  }
+
+  return null
+}
+
+// 站点开启"注册必须选择年级班级"时：年级或班级任一缺失即不满足必填要求
+const isGradeClassMissing = (grade: unknown, studentClass: unknown): boolean => {
+  return !hasText(grade) || !hasText(studentClass)
+}
+
+// 注册年级班级判定统一入口：必填开启时任一缺失即拒绝，否则要求成对填写或全部留空
+export const resolveGradeClassError = (
+  grade: unknown,
+  studentClass: unknown,
+  required = false
+): { code: string; message: string } | null => {
+  if (required && isGradeClassMissing(grade, studentClass)) {
+    return { code: 'AUTH_GRADE_CLASS_REQUIRED', message: '注册时必须选择年级和班级' }
+  }
+
+  return validateGradeClassPair(grade, studentClass)
+}