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# 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.new('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 extracted_fields
if file_type_debian?
package_file.file.use_file do |file_path|
::Packages::Debian::ExtractDebMetadataService.new(file_path).execute
end
elsif file_type_meta?
package_file.file.use_file do |file_path|
::Packages::Debian::ParseDebian822Service.new(File.read(file_path)).execute.each_value.first
end
end
end
def extract_metadata
fields = extracted_fields
architecture = fields.delete(:Architecture) if file_type_debian?
{
file_type: file_type,
architecture: architecture,
fields: fields
}
end
end
end
end
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