Replace "Gyazo/script" to follow script:

serverless-gyazo.rb

#!/usr/bin/env ruby
require 'securerandom'
require 'tmpdir'

S3_BACKET = 'my-bucket'
S3_PATH = 'path'
ENDPOINT = 'my-bucket.s3-website-ap-northeast-1.amazonaws.com'

Dir.mktmpdir do |dir|
  now = Time.now.utc
  filename = "#{now.to_i}.#{SecureRandom.uuid}.png"
  tmpfile = File.join(dir, filename)
  path = File.join(S3_PATH, now.strftime('%Y/%m/%d'), filename)
  upload_path = File.join(S3_BACKET, path)

  system(%!screencapture -i "#{tmpfile}"!)
  system(%!sips -d profile --deleteColorManagementProperties "#{tmpfile}"!)
  system(%!/usr/local/bin/aws s3 cp "#{tmpfile}" s3://#{upload_path}!)

  #system(%!osascript -e 'display notification "s3://#{upload_path}" with title "Gyazo"'!)
  system(%!open http://#{File.join(ENDPOINT, path)}!)
end