Upload bytes or base64 string to s3 ruby sdk

Question

I'm trying to upload an image to s3 using the ruby aws sdk. I'm able to upload the base64 string if I don't set the content_type. If I do set the content_type to image/png the upload is just the generic image thumbnail.

obj = #<Aws::S3::Object bucket_name="mybucket", key="test">

>> params[:file]
>> "data:image/png;base64,iVB...."

obj.put(body: params[:file], content_type: 'image/png', content_encoding: 'base64')

How can I upload a Base64 string to s3? I'm also open to uploading as bytes if that's more straight forward

Answer 1

I managed to get it to work with put, instead of upload_file. put makes more sense, since you are trying to upload an image encoded as a base64 data uri string.

Assuming your data uri string looks like:

string = 'data:image/jpeg;base64,<base_64_string>'

The key is to decode the <base_64_string> part and send it to body in the put method:

body = Base64.decode64(string.split(',')[1])

s3 = Aws::S3::Resource.new
s3.bucket(ENV['AWS_BUCKET_NAME']).object(key).put(body: body, acl: 'public-read', content_type: 'image/jpeg', content_encoding: 'base64')

This assumes you are using the the AWS Ruby library at https://github.com/aws/aws-sdk-ruby