discourse/lib/theme_store/zip_exporter.rb

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# frozen_string_literal: true
require_dependency 'compression/zip'
module ThemeStore; end
class ThemeStore::ZipExporter
def initialize(theme)
@theme = theme
@temp_folder = "#{Pathname.new(Dir.tmpdir).realpath}/discourse_theme_#{SecureRandom.hex}"
@export_name = @theme.name.downcase.gsub(/[^0-9a-z.\-]/, '-')
@export_name = "discourse-#{@export_name}" unless @export_name.starts_with?("discourse")
end
def export_name
@export_name
end
def package_filename
export_package
end
def cleanup!
FileUtils.rm_rf(@temp_folder)
end
def export_to_folder
destination_folder = File.join(@temp_folder, @export_name)
FileUtils.mkdir_p(destination_folder)
@theme.theme_fields.each do |field|
next unless path = field.file_path
# Belt and braces approach here. All the user input should already be
# sanitized, but check for attempts to leave the temp directory anyway
pathname = Pathname.new(File.join(destination_folder, path))
folder_path = pathname.parent.cleanpath
raise RuntimeError.new("Theme exporter tried to leave directory") unless folder_path.to_s.starts_with?(destination_folder)
pathname.parent.mkpath
path = pathname.realdirpath
raise RuntimeError.new("Theme exporter tried to leave directory") unless path.to_s.starts_with?(destination_folder)
if ThemeField.types[field.type_id] == :theme_upload_var
filename = Discourse.store.path_for(field.upload)
content = filename ? File.read(filename) : Discourse.store.download(field.upload).read
else
content = field.value
end
File.write(path, content)
end
File.write(File.join(destination_folder, "about.json"), JSON.pretty_generate(@theme.generate_metadata_hash))
@temp_folder
end
private
def export_package
export_to_folder
Compression::Zip.new.compress(@temp_folder, @export_name)
end
end