Ruby script to update cache control on S3 objects

s3_cache_control.rb

@s3 = Aws::S3::Client.new(
  access_key_id: ENV['AWS_ACCESS_KEY_ID'],
  secret_access_key: ENV['AWS_SECRET_ACCESS_KEY']
)

@bucket = ENV['S3_BUCKET_NAME']

def get_objects(continuation_token = nil, last_key = nil)
  options = { bucket: @bucket, prefix: 'images/uploads/' }
  options.merge!(continuation_token: continuation_token) if continuation_token
  options.merge!(start_after: last_key) if last_key
  res = @s3.list_objects_v2(options)

  replace_metadata(res[:contents])

  get_objects(res[:next_continuation_token], res[:contents].last.key) if res[:key_count] >= res[:max_keys]
end

def replace_metadata(objects)
  objects.each do |object|
    begin
      if (/^images\/uploads\//).match(object.key)
        @s3.copy_object(
          bucket: @bucket,
          key: object.key,
          copy_source: "#{@bucket}/#{object.key}",
          cache_control: 'public,max-age=31536000',
          content_type: "image/#{object.key.match(/\.(\w*$)/)[1]}",
          metadata_directive: 'REPLACE'
        )
        puts "Success: #{object.key}"
      end
    rescue Exception => e
      puts "EXCEPTION: #{object.key} - #{e}"
    end
  end
end