Shrine.rb plugin to separate storages per versions

version_storage.rb

# frozen_string_literal: true

class Shrine
  protected :_store, :_delete

  module Plugins
    # Separate storages per versions
    #
    # Usage:
    #
    #   # This will store the "original" version to the "local" store,
    #   # when recent versions will be stored to "store", just as usual.
    #   plugin :version_storage, original: :local
    module VersionStorage
      def self.configure(uploader, **opts)
        uploader.opts[:version_storage] ||= {}
        uploader.opts[:version_storage].merge!(opts)
      end

      module InstanceMethods
        protected

        def _store(io, context)
          if separate_key = storage_for(context)
            self.class.new(separate_key)._store(io, context)
          else
            super
          end
        end

        def _delete(uploaded_file, context)
          if separate_key = storage_for(context)
            self.class.new(separate_key)._delete(uploaded_file, context)
          else
            super
          end
        end

        private

        def storage_for(version: nil, **)
          key = (version && opts[:version_storage][version])
          return key if key && storage_key != key
        end
      end
    end

    register_plugin(:version_storage, VersionStorage)
  end
end

This solves shrinerb/shrine#254

Was tried for shrine 2.19.3, didn't tested with newer versions.