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path: root/app/api/vendor-responses/upload/route.ts
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// app/api/vendor-response-attachments/upload/route.ts
import { NextRequest, NextResponse } from "next/server";
import { writeFile, mkdir } from "fs/promises";
import { existsSync } from "fs";
import path from "path";
import db from "@/db/db";
import { vendorResponseAttachmentsB } from "@/db/schema";
import { getServerSession } from "next-auth/next"
import { authOptions } from "@/app/api/auth/[...nextauth]/route"

export async function POST(request: NextRequest) {
  try {
    // 인증 확인
    const session = await getServerSession(authOptions);
    if (!session?.user?.id) {
      return NextResponse.json(
        { message: "인증이 필요합니다." },
        { status: 401 }
      );
    }

    const formData = await request.formData();
    const responseId = formData.get("responseId") as string;
    const file = formData.get("file") as File;
    const description = formData.get("description") as string;

    if (!responseId) {
      return NextResponse.json(
        { message: "응답 ID가 필요합니다." },
        { status: 400 }
      );
    }

    if (!file) {
      return NextResponse.json(
        { message: "파일이 선택되지 않았습니다." },
        { status: 400 }
      );
    }

    // 파일 크기 검증 (10MB)
    if (file.size > 10 * 1024 * 1024) {
      return NextResponse.json(
        { message: "파일이 너무 큽니다. (최대 10MB)" },
        { status: 400 }
      );
    }

    // 업로드 디렉토리 생성
    const uploadDir = path.join(
      process.cwd(),
      "public",
      "uploads",
      "vendor-responses",
      responseId
    );
    
    if (!existsSync(uploadDir)) {
      await mkdir(uploadDir, { recursive: true });
    }

    // 고유한 파일명 생성
    const timestamp = Date.now();
    const sanitizedName = file.name.replace(/[^a-zA-Z0-9.-]/g, "_");
    const fileName = `${timestamp}_${sanitizedName}`;
    const filePath = `/uploads/vendor-responses/${responseId}/${fileName}`;
    const fullPath = path.join(uploadDir, fileName);

    // 파일 저장
    const buffer = Buffer.from(await file.arrayBuffer());
    await writeFile(fullPath, buffer);

    // DB에 파일 정보 저장
    const [insertedFile] = await db
      .insert(vendorResponseAttachmentsB)
      .values({
        vendorResponseId: parseInt(responseId),
        fileName,
        originalFileName: file.name,
        filePath,
        fileSize: file.size,
        fileType: file.type || path.extname(file.name).slice(1),
        description: description || null,
        uploadedBy: parseInt(session.user.id),
      })
      .returning();

    return NextResponse.json({
      id: insertedFile.id,
      fileName,
      originalFileName: file.name,
      filePath,
      fileSize: file.size,
      fileType: file.type || path.extname(file.name).slice(1),
      message: "파일이 성공적으로 업로드되었습니다.",
    });

  } catch (error) {
    console.error("File upload error:", error);
    return NextResponse.json(
      { message: "파일 업로드 중 오류가 발생했습니다." },
      { status: 500 }
    );
  }
}