AwsUploader class to directly upload url or file to s3. It Requires HTTParty and aws_sdk gems to be installed.

aws_uploader.rb

require 'aws-sdk'
require 'HTTParty'

## This class uploads a file to s3 with public-read access and return the public url
class AwsUploader

  # s3 obj after initializing the aws sdk
  attr_reader :s3

  # initialization requires aws key id, secret, s3 region and s3 bucket data all are env variables
  def initialize(key_id, secret, region, bucket)
    @aws_key_id = key_id
    @aws_secret = secret
    @aws_region = region
    @aws_bucket = bucket
    begin
      Aws.config.update({
        region: @aws_region,
        credentials: Aws::Credentials.new(@aws_key_id, @aws_secret)
      })
      @s3 = Aws::S3::Resource.new(region: @aws_region)
    rescue
      nil
    end
  end

  # requires file path to be uploaded to s3 and upload path with filename where the file to be uploaded
  # returns the public url of the uploaded file otherwise nil
  def upload_to_s3(file_with_path, upload_path)
    begin
      obj = s3.bucket(@aws_bucket).object(upload_path)
      obj.upload_file(file_with_path, acl: 'public-read')
      return obj.public_url
    rescue
      nil
    end
  end

  # requires url of the file to be uploaded to s3, file will be downloaded temporarily and then uploaded to s3 and then deleted that file
  # returns the public url of the uploaded file otherwise nil
  def upload_from_url(file_url, upload_path)
    begin
      filename = upload_path.split('/').last
      File.open(filename, "wb") do |f|
        f.write HTTParty.get(file_url).body
      end
      url = upload_to_s3(filename, upload_path)
      File.delete(filename) if File.exist?(filename)
      return url
    rescue
      nil
    end  
  end

  # Calling the class
  uploader = AwsUploader.new('AWS_KEY_ID', 'AWS_SECRET', 'AWS_S3_REGION', 'AWS_S3_BUCKET')

  # calling upload_to_s3 method
  url1 = uploader.upload_to_s3("tmp/my_image.jpg", "direct_upload_test/my_image.jpg")

  # calling  upload_from_url method
  url2 = uploader.upload_from_url("https://i0.wp.com/www.sulmanweb.com/wp-content/uploads/2019/09/IMG_9837.jpg", "direct_upload_test/my_image.jpg")

  p url1, url2
end