feat: align with upstream 1.5.9.9

server/utils/submission-restriction-policy.ts

@@ -0,0 +1,48 @@
+export type SubmissionRestrictionMode = 'none' | 'semester' | 'window'
+
+export type SubmissionRestrictionScope = 'self' | 'all'
+
+export interface SubmissionRestrictionPolicy {
+  mode: SubmissionRestrictionMode
+  sameSongHours: number | null
+  sameArtistHours: number | null
+  scope: SubmissionRestrictionScope
+}
+
+export interface SubmissionRestrictionSettings {
+  enableSubmissionRestriction?: boolean | null
+  sameSongRestrictionHours?: number | string | null
+  sameArtistRestrictionHours?: number | string | null
+  submissionRestrictionScope?: string | null
+}
+
+/** 归一化限制时长：非正整数一律视为未配置 */
+export function normalizeRestrictionHours(value: unknown): number | null {
+  if (value === null || value === undefined || value === '') return null
+  const parsed = Number(value)
+  if (!Number.isFinite(parsed)) return null
+  const hours = Math.floor(parsed)
+  return hours >= 1 ? hours : null
+}
+
+/**
+ * 重复投稿限制口径（投稿与预检共用，两处的判定必须完全一致）：
+ * - 开关关闭：不做任何重复投稿限制，普通用户可重复投稿已排期或已播放的歌曲
+ * - 开关开启且未配置时长：沿用本学期同一首歌不可重复投稿的规则
+ * - 开关开启且配置时长：按排期后的冷却窗口判定同一首歌 / 同一歌手
+ */
+export function resolveSubmissionRestrictionPolicy(
+  settings: SubmissionRestrictionSettings | null | undefined
+): SubmissionRestrictionPolicy {
+  const sameSongHours = normalizeRestrictionHours(settings?.sameSongRestrictionHours)
+  const sameArtistHours = normalizeRestrictionHours(settings?.sameArtistRestrictionHours)
+  const scope: SubmissionRestrictionScope =
+    settings?.submissionRestrictionScope === 'self' ? 'self' : 'all'
+
+  if (!settings?.enableSubmissionRestriction) {
+    return { mode: 'none', sameSongHours, sameArtistHours, scope }
+  }
+
+  const mode: SubmissionRestrictionMode = sameSongHours || sameArtistHours ? 'window' : 'semester'
+  return { mode, sameSongHours, sameArtistHours, scope }
+}