debian-mirror-gitlab/app/services/packages/debian/extract_metadata_service.rb
2022-08-27 11:52:29 +05:30

86 lines
2.1 KiB
Ruby

# frozen_string_literal: true
module Packages
module Debian
class ExtractMetadataService
include Gitlab::Utils::StrongMemoize
ExtractionError = Class.new(StandardError)
def initialize(package_file)
@package_file = package_file
end
def execute
raise ExtractionError, 'invalid package file' unless valid_package_file?
extract_metadata
end
private
attr_reader :package_file
def valid_package_file?
package_file &&
package_file.package&.debian? &&
package_file.file.size > 0 # rubocop:disable Style/ZeroLengthPredicate
end
def file_type_basic
%i[dsc deb udeb buildinfo changes].each do |format|
return format if package_file.file_name.end_with?(".#{format}")
end
nil
end
def file_type_source
# https://manpages.debian.org/buster/dpkg-dev/dpkg-source.1.en.html
%i[gzip bzip2 lzma xz].each do |format|
return :source if package_file.file_name.end_with?(".tar.#{format}")
end
nil
end
def file_type
strong_memoize(:file_type) do
file_type_basic || file_type_source || :unknown
end
end
def file_type_debian?
file_type == :deb || file_type == :udeb
end
def file_type_meta?
file_type == :dsc || file_type == :buildinfo || file_type == :changes
end
def fields
strong_memoize(:fields) do
if file_type_debian?
package_file.file.use_open_file(unlink_early: false) do |file|
::Packages::Debian::ExtractDebMetadataService.new(file.file_path).execute
end
elsif file_type_meta?
package_file.file.use_open_file do |file|
::Packages::Debian::ParseDebian822Service.new(file.read).execute.each_value.first
end
end
end
end
def extract_metadata
architecture = fields['Architecture'] if file_type_debian?
{
file_type: file_type,
architecture: architecture,
fields: fields
}
end
end
end
end