scinote-web/lib/active_storage/previewer/libreoffice_previewer.rb

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# frozen_string_literal: true
module ActiveStorage
class Previewer
class LibreofficePreviewer < Previewer
class << self
include ActiveStorageFileUtil
def accept?(blob)
previewable_document?(blob)
end
end
def preview
download_blob_to_tempfile do |input|
work_dir = File.dirname(input.path)
basename = File.basename(input.path, '.*')
preview_file = File.join(work_dir, "#{basename}.png")
Rails.logger.info "Starting preparing document preview for file #{blob.filename.sanitized}..."
begin
success = system(
"#{libreoffice_path} --headless --invisible --convert-to png --outdir #{work_dir} #{input.path}"
)
unless success && File.file?(preview_file)
raise StandardError, "There was an error generating document preview, blob id: #{blob.id}"
end
yield io: File.open(preview_file), filename: "#{blob.filename.base}.png", content_type: 'image/png'
Rails.logger.info "Finished preparing document preview for file #{blob.filename.sanitized}."
ensure
File.delete(preview_file) if File.file?(preview_file)
end
end
end
private
def tempdir
Rails.root.join('tmp')
end
def libreoffice_path
ENV['LIBREOFFICE_PATH'] || 'soffice'
end
end
end
end