Update ACL for all files in a bucket

acl.rb

require 'aws-sdk'

Aws.config.update({
  region: 'REGION_CODE_HERE',
  credentials: Aws::Credentials.new(
    'ACCESS_KEY_ID_HERE',
    'SECRET_ACCESS_KEY_HERE'
  )
})
bucket_name = 'BUCKET_NAME_HERE'

s3 = Aws::S3::Resource.new
s3.bucket(bucket_name).objects.each do |object|
  puts object.key
  object.acl.put({ acl: 'public-read' })
end