Question

Spaces Presigned POST

Posted on October 3, 2017
Object Storage
Asked by Ben Phelps

Using the ruby aws-sdk gem, presigned post uploads work correctly with AWS S3 proper and fail when attempting on Spaces. So there is some kind of non-interoperability going on.

I setup everything following this guide, https://devcenter.heroku.com/articles/direct-to-s3-image-uploads-in-rails

It’s failing with this error:

<Error> 
    <Code>InvalidArgument</Code> 
    <Message>Missing access key</Message> 
    <BucketName>bucket</BucketName> 
    <RequestId>tx0000000000000000...</RequestId> 
    <HostId>1d183-nyc3a-nyc</HostId> 
</Error>

Again, the code works with S3, fails with Spaces. Has anyone got this to work?

Submit an answer

This textbox defaults to using Markdown to format your answer.

You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!

These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.

Ben Phelps • October 6, 2017

Accepted Answer

Here is a working example using the aws-sdk-v1 gem, which is required until Spaces supports v4 signatures.

class FoobarController < ApplicationController
  layout false

  def index
    AWS.config(
      access_key_id: 'ACCESS_KEY_ID',
      secret_access_key: 'SECRET_ACCESS_KEY',
      s3_endpoint: 'nyc3.digitaloceanspaces.com',
      region: 'ny3'
    )

    bucket = AWS::S3.new.buckets['BUCKET-NAME']
    @s3_direct_post = bucket.presigned_post(
      key: "uploads/#{SecureRandom.uuid}/${filename}",
      success_action_status: '201',
      acl: 'public-read',
      content_type: ''
    )
  end
end

<%= form_tag(@s3_direct_post.url.to_s, enctype: 'multipart/form-data', authenticity_token: false, enforce_utf8: false) do %>
    <% @s3_direct_post.fields.each do |field, value| %>
        <%= hidden_field_tag field, value %>
    <% end %>
    <%= file_field_tag :file %>
    <%= submit_tag 'Upload' %>
<% end %>

zaimlvmry • January 23, 2018

This comment has been deleted

John Gannon

DigitalOcean Employee