如何在multer-S3中为AWS-S3存储桶指定上传目录？

Question

我使用express + multer-s3将文件上传到AWS S3服务.

使用以下代码,我能够将文件上传到S3 Bucket但直接上传到存储桶中.

我希望将它们上传到存储桶中的文件夹中.

我无法找到这样做的选项.

这是代码

AWS.config.loadFromPath("path-to-credentials.json");
var s3 = new AWS.S3();

var cloudStorage = multerS3({
    s3: s3,
    bucket: "sample_bucket_name",
    contentType: multerS3.AUTO_CONTENT_TYPE,
    metadata: function(request, file, ab_callback) {
        ab_callback(null, {fieldname: file.fieldname});
    },
    key: function(request, file, ab_callback) {
        var newFileName = Date.now() + "-" + file.originalname;
        ab_callback(null, newFileName);
    },
});
var upload = multer({
    storage: cloudStorage
});

router.post("/upload", upload.single('myFeildName'), function(request, response) {
    var file = request.file;
    console.log(request.file);
    response.send("aatman is awesome!");
});

Answer 1

S3并不总是有文件夹(请参阅http://docs.aws.amazon.com/AmazonS3/latest/UG/FolderOperations.html).它将通过添加由/分隔的文件名来模拟文件夹.

例如

key: function(request, file, ab_callback) {
    var newFileName = Date.now() + "-" + file.originalname;
    var fullPath = 'firstpart/secondpart/'+ newFileName;
    ab_callback(null, fullPath);
},

Answer 2

我对动态目标路径的解决方案。希望这对某人有帮助！

const fileUpload = function upload(destinationPath) {
  return multer({
    fileFilter: (req, file, cb) => {
      const isValid = !!MIME_TYPE_MAP[file.mimetype];
      let error = isValid ? null : new Error("Invalid mime type!");
      cb(error, isValid);
    },
    storage: multerS3({
      limits: 500000,
      acl: "public-read",
      s3,
      bucket: YOUR_BUCKET_NAME,
      contentType: multerS3.AUTO_CONTENT_TYPE,
      metadata: function (req, file, cb) {
        cb(null, { fieldName: file.fieldname });
      },
      key: function (req, file, cb) {
        cb(null, destinationPath + "/" + file.originalname);
      },
    }),
  });
};



module.exports = fileUpload;

如何调用：

router.patch(
  "/updateProfilePicture/:userID",
  fileUpload("user").single("profileimage"),
  usersControllers.updateProfilePicture
);

“个人资料图片”是正文中传递的文件的键。
“用户”是目标文件夹的路径。您可以传递任何路径，包括文件夹和子文件夹。所以这会将我的文件放在我的存储桶中名为“user”的文件夹中。