shrine_direct_upload_example.rb

# This code is license under the MIT license 
# Full text: https://opensource.org/licenses/MIT
# Author Stanko K.R. <hey@stanko.io>

# Usage:
# ```ruby
# user.avatar = S3UrlToShrineObjectConverter.call(
#   arguments[:input][:avatar][:url],
#   name: arguments[:input][:avatar][:filename]
# )

require 'uri'

class S3UrlToShrineObjectConverter
  def self.call(*args)
    new(*args).call
  end
  
  def initialize(url, name: nil)
    @url = url
    @name = name
  end
  
  def call
    return unless object&.exists?
    
    {
      id: id,
      storage: storage,
      metadata: {
        size: object.content_length,
        filename: name || id,
        mime_type: object.content_type
      }
    }
  end
  
  protected
  
  attr_reader :url
  attr_reader :name
  
  private
  
  def object
    @object ||= bucket.object(uri.path)
  end
  
  def uri
    @uri ||= URI(url)
  end
  
  def bucket
    @bucket ||= begin
      s3 = AWS::S3.new({}) # TODO: configure this
      s3.buckets['your_bucket_name'] # TODO: load this from the app's config
    end
  end
  
  def id
    @id ||= uri.path.split('/', 2).last
  end
  
  def storage
    @storage ||= uri.path.split('/', 2).first
  end
end