Base Shrine Uploader

base_uploader.rb

# frozen_string_literal: true

require "image_processing/mini_magick"

class BaseUploader < Shrine
  ALLOWED_TYPES = %w[image/jpeg image/png image/svg+xml image/gif].freeze
  MAX_SIZE      = 10 * 1024 * 1024 # 10 MB

  plugin :remove_attachment
  plugin :pretty_location
  plugin :processing
  plugin :versions
  plugin :validation_helpers
  plugin :store_dimensions, analyzer: :mini_magick

  plugin :remote_url, max_size: nil

  plugin :default_url

  plugin :upload_options, store: -> (io, context) do
    { acl: "private" }
  end

  Attacher.default_url do |_options|
    host = if Rails.env.production?
             ENV.fetch('PRODUCTION_URL')
           elsif Rails.env.staging?
             ENV.fetch('STAGING_URL')
           else
             "http://localhost:3000"
           end
    class_name = context[:record].class.name.to_s.downcase
    "#{host}/assets/defaults/#{class_name}/#{context[:name]}.png"
  end

  Attacher.validate do
    validate_max_size MAX_SIZE
    if validate_mime_type_inclusion(ALLOWED_TYPES)
      validate_max_width 10_000
      validate_max_height 10_000
    end
  end


  def generate_location(io, context)
    type  = context[:record].class.name.downcase if context[:record]
    style = context[:version] == :original ? "originals" : "thumbs" if context[:version]
    name  = super # the default unique identifier

    [style, name].compact.join("/")
  end

  process(:store) do |io, _context|
    original = io.download

    thumbnail = ImageProcessing::MiniMagick
                .source(original)
                .resize_to_limit!(600, nil)

    original.close!

    {original: io, thumbnail: thumbnail}
  end
end