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Contents
# frozen_string_literal: true
module Lcms
module Engine
class LessonsPdfBundler
attr_reader :unit
PDF_LINKS_KEYS = {
full: 'pdf',
tm: 'pdf_tm',
sm: 'pdf_sm'
}.freeze
# tmp folder for downloaded pdfs and bundled zip
TMP_FOLDER = Rails.root.join('tmp', 'unbounded-pdfs')
def initialize(unit, type = :full)
@unit = unit
@type = type.to_sym
end
def bundle
return if files.empty?
folder = File.join(TMP_FOLDER, dirname)
begin
FileUtils.mkdir_p folder # ensure the folder exists
files.each do |url|
fname = filename url
download url, File.join(folder, fname)
end
zip_files
ensure
FileUtils.rm_r(folder) if File.exist?(folder) # remove tmp pdfs
end
# return ziped bundle path
"#{folder}.zip"
end
private
def dirname
@dirname ||= Breadcrumbs.new(unit).pieces.map(&:parameterize).push(@type.to_s).join('_')
end
def documents
@documents ||= unit.children.map(&:document).compact
end
def download(url, path)
# Reads and writes in chunks, and thus does not read the whole file in memory
File.open(path, 'w') do |f|
IO.copy_stream(URI.parse(url).open, f)
end
end
def filename(uri)
URI(uri).path.split('/').last
end
def files
key = PDF_LINKS_KEYS[@type]
documents.map { |d| d.links[key] }.compact
end
def zip_files
`cd #{TMP_FOLDER} && zip -r #{dirname} #{dirname}/*.pdf`
end
end
end
end
Version data entries
16 entries across 16 versions & 1 rubygems