Download and Upload File to AWS S3 in Ruby

## Install gem aws-sdk first
require 'aws-sdk'
require "httparty"

ACCESS_KEY_ID = 'your access id to aws s3'
SECRETE_ACCESS_KEY = 'your secrete access key to aws s3'
BUCKET_NAME = 'Your aws s3 bucket name'

s3 = AWS::S3.new(access_key_id: ACCESS_KEY_ID, secret_access_key: SECRETE_ACCESS_KEY)

## Name of file name to store in your local
file_name = "#{Rails.root}/tmp/#{File.basename(User.first.avatar_url)}"

File.open(file_name, "wb") do |f|
  ## Write file to local
  f.write HTTParty.get(User.first.avatar_url).parsed_response

  key = User.first.avatar_url.match('file_url_domain').post_match
  s3.buckets[BUCKET_NAME].objects[key].write(:file => file_name)
end