Add Packages::Debian::FileEntry

app/models/packages/debian/file_entry.rb

+# frozen_string_literal: true
+
+module Packages
+  module Debian
+    class FileEntry
+      include ActiveModel::Model
+
+      DIGESTS = %i[md5 sha1 sha256].freeze
+      FILENAME_REGEX = %r{\A[a-zA-Z0-9][a-zA-Z0-9_.~+-]*\z}.freeze
+
+      attr_accessor :filename,
+                    :size,
+                    :md5sum,
+                    :section,
+                    :priority,
+                    :sha1sum,
+                    :sha256sum,
+                    :package_file
+
+      validates :filename, :size, :md5sum, :section, :priority, :sha1sum, :sha256sum, :package_file, presence: true
+      validates :filename, format: { with: FILENAME_REGEX }
+      validate :valid_package_file_digests, if: -> { md5sum.present? && sha1sum.present? && sha256sum.present? && package_file.present? }
+
+      def component
+        return 'main' if section.blank?
+        return 'main' unless section.include?('/')
+
+        section.split('/')[0]
+      end
+
+      private
+
+      def valid_package_file_digests
+        DIGESTS.each do |digest|
+          package_file_digest = package_file["file_#{digest}"]
+          sum = public_send("#{digest}sum") # rubocop:disable GitlabSecurity/PublicSend
+          next if package_file_digest == sum
+
+          errors.add("#{digest}sum".to_sym, "mismatch for #{filename}: #{package_file_digest} != #{sum}")
+        end
+      end
+    end
+  end
+end

spec/models/packages/debian/file_entry_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Packages::Debian::FileEntry, type: :model do
+  let_it_be(:package_file) { create(:debian_package_file, :dsc) }
+
+  let(:filename) { 'sample_1.2.3~alpha2.dsc' }
+  let(:size) { 671 }
+  let(:md5sum) { '3b0817804f669e16cdefac583ad88f0e' }
+  let(:section) { 'libs' }
+  let(:priority) { 'optional' }
+  let(:sha1sum) { '32ecbd674f0bfd310df68484d87752490685a8d6' }
+  let(:sha256sum) { '844f79825b7e8aaa191e514b58a81f9ac1e58e2180134b0c9512fa66d896d7ba' }
+
+  let(:file_entry) do
+    described_class.new(
+      filename: filename,
+      size: size,
+      md5sum: md5sum,
+      section: section,
+      priority: priority,
+      sha1sum: sha1sum,
+      sha256sum: sha256sum,
+      package_file: package_file
+    )
+  end
+
+  subject { file_entry }
+
+  describe 'validations' do
+    it { is_expected.to be_valid }
+
+    describe '#filename' do
+      it { is_expected.to validate_presence_of(:filename) }
+      it { is_expected.not_to allow_value('Hé').for(:filename) }
+    end
+
+    describe '#size' do
+      it { is_expected.to validate_presence_of(:size) }
+    end
+
+    describe '#md5sum' do
+      it { is_expected.to validate_presence_of(:md5sum) }
+      it { is_expected.not_to allow_value('12345678901234567890123456789012').for(:md5sum).with_message('mismatch for sample_1.2.3~alpha2.dsc: 3b0817804f669e16cdefac583ad88f0e != 12345678901234567890123456789012') }
+    end
+
+    describe '#section' do
+      it { is_expected.to validate_presence_of(:section) }
+    end
+
+    describe '#priority' do
+      it { is_expected.to validate_presence_of(:priority) }
+    end
+
+    describe '#sha1sum' do
+      it { is_expected.to validate_presence_of(:sha1sum) }
+      it { is_expected.not_to allow_value('1234567890123456789012345678901234567890').for(:sha1sum).with_message('mismatch for sample_1.2.3~alpha2.dsc: 32ecbd674f0bfd310df68484d87752490685a8d6 != 1234567890123456789012345678901234567890') }
+    end
+
+    describe '#sha256sum' do
+      it { is_expected.to validate_presence_of(:sha256sum) }
+      it { is_expected.not_to allow_value('1234567890123456789012345678901234567890123456789012345678901234').for(:sha256sum).with_message('mismatch for sample_1.2.3~alpha2.dsc: 844f79825b7e8aaa191e514b58a81f9ac1e58e2180134b0c9512fa66d896d7ba != 1234567890123456789012345678901234567890123456789012345678901234') }
+    end
+
+    describe '#package_file' do
+      it { is_expected.to validate_presence_of(:package_file) }
+    end
+  end
+
+  describe '#component' do
+    subject { file_entry.component }
+
+    context 'without section' do
+      let(:section) { nil }
+
+      it { is_expected.to eq 'main' }
+    end
+
+    context 'with empty section' do
+      let(:section) { '' }
+
+      it { is_expected.to eq 'main' }
+    end
+
+    context 'with ruby section' do
+      let(:section) { 'ruby' }
+
+      it { is_expected.to eq 'main' }
+    end
+
+    context 'with contrib/ruby section' do
+      let(:section) { 'contrib/ruby' }
+
+      it { is_expected.to eq 'contrib' }
+    end
+  end
+end