Pass dynamic headers to attacher

[aka-nez]

Hi! I am working on a feature that allows users to upload files via URL. Some of these files may require additional dynamic headers to be passed.

I'm following the guide about multiple files: https://shrinerb.com/docs/multiple-files and remote files https://shrinerb.com/docs/plugins/remote_url

My uploader:

class SpecFileUploader < Shrine
  plugin :instrumentation
  plugin :determine_mime_type, analyzer: :mime_types
  plugin :validation_helpers
  plugin :validation_open_api_structure

  plugin :remote_url, max_size: 5 * 1024 * 1024, error_message: 'download failed',
    downloader: -> (url, **options) do
      Down::Http.download(url, **options) do |client|
        client.follow(max_hops: 2).timeout(connect: 2, read: 2)
      end
    end

  Attacher.validate do
    # some validations
  end
end

My models:

class Spec < ActiveRecord::Base
  has_many :files, -> { order(created_at: :asc) }, dependent: :destroy, class_name: 'SpecFile'
  accepts_nested_attributes_for :files, allow_destroy: true
end

# frozen_string_literal: true

class SpecFile < ActiveRecord::Base
  include SpecFileUploader::Attachment(:file)
  belongs_to :spec
end

I attach files via nested attributes, and everything works fine.

params.merge!(files_attributes: [{ file_remote_url: params[:file_remote_url] }])
Spec.create(params)

But I also have to pass custom headers provided by users to the downloader, and I can't find any option even after dig into plugin source code:

shrine/lib/shrine/plugins/remote_url.rb

Line 42 in 004ffc8

send(:"#{name}_attacher").remote_url = url

shrine/lib/shrine/plugins/remote_url.rb

Line 55 in 004ffc8

def remote_url(url, **options)

Maybe I miss something and is there way to pass headers to download through model attributes?