activestorage/app/controllers/active_storage/direct_uploads_controller.rb


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# Creates a new blob on the server side in anticipation of a direct-to-service upload from the client side.
# When the client-side upload is completed, the signed_blob_id can be submitted as part of the form to reference
# the blob that was created up front.
class ActiveStorage::DirectUploadsController < ActionController::Base
  def create
    blob = ActiveStorage::Blob.create_before_direct_upload!(blob_args)
    render json: direct_upload_json(blob)
  end

  private
    def blob_args
      params.require(:blob).permit(:filename, :byte_size, :checksum, :content_type, :metadata).to_h.symbolize_keys
    end

    def direct_upload_json(blob)
      blob.as_json(methods: :signed_id).merge(direct_upload: {
        url: blob.service_url_for_direct_upload,
        headers: blob.service_headers_for_direct_upload
      })
    end
end