feat: initialize AutoTeacher Next.js project structure

src/app/api/assignments/[assignmentId]/export/route.ts

@@ -0,0 +1,131 @@
+import { Buffer } from "node:buffer";
+import { auth } from "@clerk/nextjs/server";
+import { NextResponse } from "next/server";
+import * as XLSX from "xlsx";
+import { prisma } from "@/lib/prisma";
+import { getNumericParam } from "@/lib/route-params";
+
+type AssignmentRouteParams = { assignmentId: string | string[] | undefined };
+
+const EXPORTABLE_COLUMNS = {
+  studentId: { header: "学号", getter: (submission: any) => submission.studentId },
+  studentName: { header: "姓名", getter: (submission: any) => submission.studentName },
+  originalFilename: {
+    header: "文件名",
+    getter: (submission: any) => submission.originalFilename,
+  },
+  fileUrl: { header: "文件地址", getter: (submission: any) => submission.fileUrl },
+  submittedAt: {
+    header: "提交时间",
+    getter: (submission: any) =>
+      submission.submittedAt ? new Date(submission.submittedAt).toISOString() : "",
+  },
+  evaluationScore: {
+    header: "得分",
+    getter: (submission: any) =>
+      typeof submission.evaluationScore === "number"
+        ? submission.evaluationScore
+        : "",
+  },
+  evaluationComment: {
+    header: "评价评语",
+    getter: (submission: any) => submission.evaluationComment ?? "",
+  },
+  evaluatedAt: {
+    header: "评价时间",
+    getter: (submission: any) =>
+      submission.evaluatedAt ? new Date(submission.evaluatedAt).toISOString() : "",
+  },
+} as const;
+
+const DEFAULT_COLUMNS = ["studentId", "evaluationScore"] as Array<keyof typeof EXPORTABLE_COLUMNS>;
+
+export async function GET(
+  request: Request,
+  { params }: { params: Promise<AssignmentRouteParams> },
+) {
+  const resolvedParams = await params;
+  const assignmentId = getNumericParam(resolvedParams.assignmentId);
+  if (Number.isNaN(assignmentId)) {
+    return NextResponse.json({ error: "作业不存在" }, { status: 400 });
+  }
+
+  const { userId } = await auth();
+  if (!userId) {
+    return NextResponse.json({ error: "未授权" }, { status: 401 });
+  }
+
+  const assignment = await prisma.assignment.findFirst({
+    where: { id: assignmentId, teacherId: userId },
+    select: { id: true, title: true },
+  });
+
+  if (!assignment) {
+    return NextResponse.json({ error: "未找到作业" }, { status: 404 });
+  }
+
+  const url = new URL(request.url);
+  const columnsParam = url.searchParams.get("columns");
+  const requestedColumns = columnsParam
+    ? columnsParam
+        .split(",")
+        .map((item) => item.trim())
+        .filter((item) => item.length > 0)
+    : null;
+
+  const selectedColumns =
+    requestedColumns && requestedColumns.length > 0
+      ? requestedColumns.filter(
+          (key): key is keyof typeof EXPORTABLE_COLUMNS => key in EXPORTABLE_COLUMNS,
+        )
+      : DEFAULT_COLUMNS;
+
+  if (!selectedColumns.length) {
+    return NextResponse.json({ error: "请选择有效的导出列" }, { status: 400 });
+  }
+
+  const submissions = await prisma.submission.findMany({
+    where: { assignmentId },
+    orderBy: { submittedAt: "asc" },
+  });
+
+  const worksheetData = submissions.map((submission) => {
+    const row: Record<string, unknown> = {};
+    for (const column of selectedColumns) {
+      const { header, getter } = EXPORTABLE_COLUMNS[column];
+      row[header] = getter(submission);
+    }
+    return row;
+  });
+
+  if (worksheetData.length === 0) {
+    worksheetData.push(
+      Object.fromEntries(
+        selectedColumns.map((column) => [
+          EXPORTABLE_COLUMNS[column].header,
+          "",
+        ]),
+      ),
+    );
+  }
+
+  const worksheet = XLSX.utils.json_to_sheet(worksheetData);
+  const workbook = XLSX.utils.book_new();
+  XLSX.utils.book_append_sheet(workbook, worksheet, "Submissions");
+  const buffer = XLSX.write(workbook, { bookType: "xlsx", type: "buffer" }) as Buffer;
+
+  const filenameSafeTitle = assignment.title
+    ? assignment.title.replace(/[^\w\s-]/g, "").replace(/\s+/g, "_")
+    : `assignment_${assignmentId}`;
+  const filename = `${filenameSafeTitle}_submissions.xlsx`;
+
+  return new NextResponse(buffer, {
+    status: 200,
+    headers: {
+      "Content-Type": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+      "Content-Disposition": `attachment; filename="${encodeURIComponent(filename)}"`,
+      "Content-Length": buffer.length.toString(),
+      "Cache-Control": "no-store",
+    },
+  });
+}