cw_webpffi_webp_conv.rb

# Carrierwave works incorrectly with file formatting. If you do not override
# path and url methods it will return you incorrect path and url to webp file
# respectively. Also you should add removing callback because Carrierwave could
# not delete webp file by itself because of incorrect path.
# Remove this hacks if this issue will be fixed.
class ItemGalleryUploader < ApplicationUploader
  WEBP_VERSION_NAME = :webpver
  WEBP_CONV_OPTIONS = {quality: 80, method: 5}.freeze

  before :remove, :clear_webp_file

  version WEBP_VERSION_NAME do
    process :convert_to_webp

    def path
      incorrect_path = super.split('.')
      incorrect_path.pop
      incorrect_path.join('.') + '.webp'
    end

    def url
      incorrect_path = super.split('.')
      incorrect_path.pop
      incorrect_path.join('.') + '.webp'
    end
  end

  private

  def convert_to_webp
    return if file.content_type.include?('image/svg')
    file_path = file.path.split('.')
    file_path.pop
    webp_file_path = file_path.join('.') + '.webp'
    WebP.encode(file.path, webp_file_path, WEBP_CONV_OPTIONS)
    @filename = webp_file_path.split('/').last
    @file = CarrierWave::SanitizedFile.new(
      tempfile: webp_file_path,
      filename: @filename,
      content_type: 'image/webp'
    )
  end

  def clear_webp_file
    path = self.try(WEBP_VERSION_NAME).try(:path)
    return unless path && File.exist?(path)
    File.unlink(path)
  end
end