xiaohongshu
xiaohongshu
file-storage
ファイルアップロード、S3、ファイルシステム操作を扱う際に使用。
Full skill instructions
ユーザーアップロードは信用しない。検証必須。
// ⚠️ 必須チェック
const ALLOWED_TYPES = ['image/jpeg', 'image/png', 'image/webp'];
const MAX_SIZE = 5 * 1024 * 1024; // 5MB
function validateUpload(file: File) {
// MIMEタイプ(⚠️ 拡張子だけで判断しない)
if (!ALLOWED_TYPES.includes(file.mimetype)) {
throw new Error('Invalid file type');
}
// サイズ
if (file.size > MAX_SIZE) {
throw new Error('File too large');
}
// ファイル名サニタイズ
const safeName = sanitizeFilename(file.originalname);
}
import { getSignedUrl } from '@aws-sdk/s3-request-presigner';
const url = await getSignedUrl(s3Client, new GetObjectCommand({
Bucket: 'my-bucket',
Key: 'file.pdf'
}), { expiresIn: 3600 }); // 1時間
xiaohongshu
technical spec
product ux expert
database patterns
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