From f05e353d1e601ffd7a25630705fbcb808f42d65b Mon Sep 17 00:00:00 2001
From: wuzilong <704541015@qq.com>
Date: Mon, 14 Sep 2026 11:32:17 +0800
Subject: [PATCH] feat(miniprogram): add apply attachment display name helper

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 miniprogram/utils/bxAttachmentDisplayName.js | 28 ++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 miniprogram/utils/bxAttachmentDisplayName.js

diff --git a/miniprogram/utils/bxAttachmentDisplayName.js b/miniprogram/utils/bxAttachmentDisplayName.js
new file mode 100644
index 000000000..a43b4356a
--- /dev/null
+++ b/miniprogram/utils/bxAttachmentDisplayName.js
@@ -0,0 +1,28 @@
+const ILLEGAL = /[/\\:*?"<>|\u0000-\u001f]/g
+
+export function sanitizeRemarkBaseName(remark) {
+  const cleaned = String(remark || '')
+    .trim()
+    .replace(ILLEGAL, '_')
+    .replace(/\s+/g, '_')
+    .replace(/_+/g, '_')
+    .replace(/^_|_$/g, '')
+  if (!cleaned) return ''
+  return cleaned.length > 40 ? cleaned.slice(0, 40) : cleaned
+}
+
+function splitExt(fileName) {
+  const name = String(fileName || '')
+  const i = name.lastIndexOf('.')
+  if (i <= 0 || i === name.length - 1) return { base: name, ext: '' }
+  return { base: name.slice(0, i), ext: name.slice(i) }
+}
+
+export function buildApplyAttachmentDisplayName({ remark, originalFileName, index1 }) {
+  const original = String(originalFileName || '').trim() || '申请附件'
+  const base = sanitizeRemarkBaseName(remark)
+  if (!base) return original
+  const { ext } = splitExt(original)
+  const n = Math.max(1, Math.floor(Number(index1) || 1))
+  return `${base}_${n}${ext}`
+}