feat: 新增通用导入中心

apps/server/src/imports/imports.workbook.ts

@@ -0,0 +1,39 @@
+import * as ExcelJS from 'exceljs';
+import { cellValue, textValue } from './imports.helpers';
+import type { CellValue } from './imports.types';
+
+const MAX_SHEETS = 30;
+const MAX_ROWS_PER_SHEET = 3000;
+const MAX_COLS_PER_SHEET = 60;
+
+export interface ImportSheetData {
+  name: string;
+  headers: string[];
+  rows: CellValue[][];
+}
+
+export function extractSheets(workbook: ExcelJS.Workbook): ImportSheetData[] {
+  const sheets: ImportSheetData[] = [];
+  for (const worksheet of workbook.worksheets) {
+    if (sheets.length >= MAX_SHEETS) break;
+    const headers: string[] = [];
+    const rows: CellValue[][] = [];
+    const firstRow = worksheet.getRow(1);
+    for (let col = 1; col <= Math.min(firstRow.cellCount, MAX_COLS_PER_SHEET); col += 1) {
+      const header = textValue(cellValue(firstRow.getCell(col)));
+      headers.push(header);
+    }
+    if (!headers.some(Boolean)) continue;
+    worksheet.eachRow({ includeEmpty: false }, (row, rowNumber) => {
+      if (rowNumber === 1 || rows.length >= MAX_ROWS_PER_SHEET) return;
+      const values: CellValue[] = [];
+      for (let col = 1; col <= headers.length; col += 1) {
+        values.push(cellValue(row.getCell(col)));
+      }
+      if (values.every((v) => v === null || textValue(v) === '')) return;
+      rows.push(values);
+    });
+    if (rows.length > 0) sheets.push({ name: worksheet.name, headers, rows });
+  }
+  return sheets;
+}