How to specify upload directory in multer-S3 for AWS-S3 bucket?

user_3180853 0
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I am using express + multer-s3 to upload files to AWS S3 service.

Using the following code, I was able to upload the files to S3 Bucket but directly in the bucket.

I want them to be uploaded in a folder inside the bucket.

I was not able to find the option to do so.

Here is the code

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!");
});
multer-s3 node.js amazon-s3
3 Answers

My solution to dynamic destination path. Hope this helps somebody!

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;

How to call:

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

"profile image" is the key for the file passed in the body.
"user" is path to the destination folder. You can pass any path, consisting of folder and sub folders. So this puts my file in a folder called "user" inside my bucket.

user_36737140

There is another nice way of doing it! After you write your bucket name, add the folder name there itself with a slash infront.

const multerS3Config = multerS3({
    s3: s3,
    bucket: process.env.AWS_BUCKET_NAME + '/<your-folder-name>', //put a slash infront
    metadata: function (req, file, cb) {
        cb(null, { fieldName: file.fieldname });
    },
    key: function (req, file, cb) {
    cb(null, Date.now() + file.originalname)
    }  
});
user_129626760
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