Set max file size for `presignedPutObject`

[baptisteArno]

How can I make sure a file larger than 10 MB isn't uploaded to a presigned PUT request?

I don't see any options to do that with the presignedPutObject method.

[prakashsvmx]

Not sure if i understand the requirement fully.

may you Please have a look at : https://github.com/minio/minio-js/blob/06e408198fb9000406cc5b2facb50a3276f81df1/src/test/functional/functional-tests.js#L986

[baptisteArno]

I'm using the presignedPutObject method to generate a presigned URL on which the user can directly upload the file.

It seems presignedPostPolicy method is a totally different topic!

[vadmeste]

I'm using the presignedPutObject method to generate a presigned URL on which the user can directly upload the file.

AFAIK, limiting upload objects with PUT is not possible in S3 spec. You will need to use POST instead.

[baptisteArno]

Thank you for the info @vadmeste

So I tried to switch to a POST presigned URL instead:

On my server:

const tenMB = 10485760
const urlExpiry = 120 //seconds

const presignedUrl = await client.presignedUrl(
    'POST',
    process.env.S3_BUCKET,
    filePath,
    urlExpiry,
    {
      Conditions: ['content-length-range', 0, tenMB],
    }
  )

Then calling this URL on my client:

const file = e.target.files[0]
const formData = new FormData()
formData.append('file', file)
await sendRequest({
      url: presignedUrl,
      method: 'POST',
      body: formData,
    })

It fails with a BadRequest code.

I couldn't find any doc about the presignedUrl method. What am I missing?

[prakashsvmx]

Conditions: ['content-length-range', 0, tenMB], is part of preSignedPostPolicy so it needs to be set via postPolicy