Add Debian API endpoint for Packages files

Changelog: added

lib/api/concerns/packages/debian_package_endpoints.rb

@@ -6,9 +6,9 @@ module API
       module DebianPackageEndpoints
         extend ActiveSupport::Concern
 
-        DISTRIBUTION_REGEX = %r{[a-zA-Z0-9][a-zA-Z0-9.-]*}.freeze
-        COMPONENT_REGEX = %r{[a-z-]+}.freeze
-        ARCHITECTURE_REGEX = %r{[a-z][a-z0-9]*}.freeze
+        DISTRIBUTION_REGEX = %r{[a-z0-9][a-z0-9.-]*}i.freeze
+        COMPONENT_REGEX = %r{[a-z0-9][a-z0-9.-]*}i.freeze
+        ARCHITECTURE_REGEX = %r{[a-z0-9][-a-z0-9]*}.freeze
         LETTER_REGEX = %r{(lib)?[a-z0-9]}.freeze
         PACKAGE_REGEX = API::NO_SLASH_URL_PART_REGEX
         DISTRIBUTION_REQUIREMENTS = {
@@ -100,8 +100,20 @@ module API
 
                 route_setting :authentication, authenticate_non_public: true
                 get 'Packages' do
-                  # https://gitlab.com/gitlab-org/gitlab/-/issues/5835#note_414103286
-                  'TODO Packages'
+                  relation = "::Packages::Debian::#{project_or_group.class.name}ComponentFile".constantize
+
+                  component_file = relation
+                    .preload_distribution
+                    .with_container(project_or_group)
+                    .with_codename_or_suite(params[:distribution])
+                    .with_component_name(params[:component])
+                    .with_file_type(:packages)
+                    .with_architecture_name(params[:architecture])
+                    .with_compression_type(nil)
+                    .order_created_asc
+                    .last!
+
+                  present_carrierwave_file!(component_file.file)
                 end
               end
             end

spec/requests/api/debian_group_packages_spec.rb

@@ -25,13 +25,13 @@ RSpec.describe API::DebianGroupPackages do
     end
 
     describe 'GET groups/:id/-/packages/debian/dists/*distribution/:component/binary-:architecture/Packages' do
-      let(:url) { "/groups/#{container.id}/-/packages/debian/dists/#{distribution.codename}/#{component}/binary-#{architecture}/Packages" }
+      let(:url) { "/groups/#{container.id}/-/packages/debian/dists/#{distribution.codename}/#{component.name}/binary-#{architecture.name}/Packages" }
 
-      it_behaves_like 'Debian repository read endpoint', 'GET request', :success, /^TODO Packages$/
+      it_behaves_like 'Debian repository read endpoint', 'GET request', :success, /Description: This is an incomplete Packages file/
     end
 
     describe 'GET groups/:id/-/packages/debian/pool/:component/:letter/:source_package/:file_name' do
-      let(:url) { "/groups/#{container.id}/-/packages/debian/pool/#{component}/#{letter}/#{source_package}/#{package_name}_#{package_version}_#{architecture}.deb" }
+      let(:url) { "/groups/#{container.id}/-/packages/debian/pool/#{component.name}/#{letter}/#{source_package}/#{package_name}_#{package_version}_#{architecture.name}.deb" }
 
       it_behaves_like 'Debian repository read endpoint', 'GET request', :success, /^TODO File$/
     end

spec/requests/api/debian_project_packages_spec.rb

@@ -25,13 +25,13 @@ RSpec.describe API::DebianProjectPackages do
     end
 
     describe 'GET projects/:id/packages/debian/dists/*distribution/:component/binary-:architecture/Packages' do
-      let(:url) { "/projects/#{container.id}/packages/debian/dists/#{distribution.codename}/#{component}/binary-#{architecture}/Packages" }
+      let(:url) { "/projects/#{container.id}/packages/debian/dists/#{distribution.codename}/#{component.name}/binary-#{architecture.name}/Packages" }
 
-      it_behaves_like 'Debian repository read endpoint', 'GET request', :success, /^TODO Packages$/
+      it_behaves_like 'Debian repository read endpoint', 'GET request', :success, /Description: This is an incomplete Packages file/
     end
 
     describe 'GET projects/:id/packages/debian/pool/:component/:letter/:source_package/:file_name' do
-      let(:url) { "/projects/#{container.id}/packages/debian/pool/#{component}/#{letter}/#{source_package}/#{package_name}_#{package_version}_#{architecture}.deb" }
+      let(:url) { "/projects/#{container.id}/packages/debian/pool/#{component.name}/#{letter}/#{source_package}/#{package_name}_#{package_version}_#{architecture.name}.deb" }
 
       it_behaves_like 'Debian repository read endpoint', 'GET request', :success, /^TODO File$/
     end

spec/support/shared_examples/requests/api/debian_packages_shared_examples.rb

@@ -16,11 +16,13 @@ RSpec.shared_context 'Debian repository shared context' do |container_type, can_
   let_it_be(:private_component, freeze: true) { create("debian_#{container_type}_component", distribution: private_distribution, name: 'existing-component') }
   let_it_be(:private_architecture_all, freeze: true) { create("debian_#{container_type}_architecture", distribution: private_distribution, name: 'all') }
   let_it_be(:private_architecture, freeze: true) { create("debian_#{container_type}_architecture", distribution: private_distribution, name: 'existing-arch') }
+  let_it_be(:private_component_file) { create("debian_#{container_type}_component_file", component: private_component, architecture: private_architecture) }
 
   let_it_be(:public_distribution, freeze: true) { create("debian_#{container_type}_distribution", :with_file, container: public_container, codename: 'existing-codename') }
   let_it_be(:public_component, freeze: true) { create("debian_#{container_type}_component", distribution: public_distribution, name: 'existing-component') }
   let_it_be(:public_architecture_all, freeze: true) { create("debian_#{container_type}_architecture", distribution: public_distribution, name: 'all') }
   let_it_be(:public_architecture, freeze: true) { create("debian_#{container_type}_architecture", distribution: public_distribution, name: 'existing-arch') }
+  let_it_be(:public_component_file) { create("debian_#{container_type}_component_file", component: public_component, architecture: public_architecture) }
 
   if container_type == :group
     let_it_be(:private_project) { create(:project, :private, group: private_container) }
@@ -40,14 +42,15 @@ RSpec.shared_context 'Debian repository shared context' do |container_type, can_
   let(:visibility_level) { :public }
 
   let(:distribution) { { private: private_distribution, public: public_distribution }[visibility_level] }
+  let(:architecture) { { private: private_architecture, public: public_architecture }[visibility_level] }
+  let(:component) { { private: private_component, public: public_component }[visibility_level] }
+  let(:component_file) { { private: private_component_file, public: public_component_file }[visibility_level] }
 
-  let(:component) { 'main' }
-  let(:architecture) { 'amd64' }
   let(:source_package) { 'sample' }
   let(:letter) { source_package[0..2] == 'lib' ? source_package[0..3] : source_package[0] }
   let(:package_name) { 'libsample0' }
   let(:package_version) { '1.2.3~alpha2' }
-  let(:file_name) { "#{package_name}_#{package_version}_#{architecture}.deb" }
+  let(:file_name) { "#{package_name}_#{package_version}_#{architecture.name}.deb" }
 
   let(:method) { :get }