Add PyPI package requests forward

app/finders/packages/pypi/packages_finder.rb

@@ -3,11 +3,8 @@
 module Packages
   module Pypi
     class PackagesFinder < ::Packages::GroupOrProjectPackageFinder
-      def execute!
-        results = packages.with_normalized_pypi_name(@params[:package_name])
-        raise ActiveRecord::RecordNotFound if results.empty?
-
-        results
+      def execute
+        packages.with_normalized_pypi_name(@params[:package_name])
       end
 
       private

db/migrate/20210806152104_add_pypi_package_requests_forwarding_to_application_settings.rb

+# frozen_string_literal: true
+
+class AddPypiPackageRequestsForwardingToApplicationSettings < ActiveRecord::Migration[6.1]
+  include Gitlab::Database::MigrationHelpers
+
+  def up
+    with_lock_retries do
+      add_column(:application_settings, :pypi_package_requests_forwarding, :boolean, default: true, null: false)
+    end
+  end
+
+  def down
+    with_lock_retries do
+      remove_column(:application_settings, :pypi_package_requests_forwarding)
+    end
+  end
+end

db/schema_migrations/20210806152104

+1bdbcc6ef5ccf7a2bfb1f9571885e218e230a81b632a2d993302bd87432963f3
\ No newline at end of file

db/structure.sql

@@ -9624,6 +9624,7 @@ CREATE TABLE application_settings (
     usage_ping_features_enabled boolean DEFAULT false NOT NULL,
     encrypted_customers_dot_jwt_signing_key bytea,
     encrypted_customers_dot_jwt_signing_key_iv bytea,
+    pypi_package_requests_forwarding boolean DEFAULT true NOT NULL,
     CONSTRAINT app_settings_container_reg_cleanup_tags_max_list_size_positive CHECK ((container_registry_cleanup_tags_service_max_list_size >= 0)),
     CONSTRAINT app_settings_ext_pipeline_validation_service_url_text_limit CHECK ((char_length(external_pipeline_validation_service_url) <= 255)),
     CONSTRAINT app_settings_registry_exp_policies_worker_capacity_positive CHECK ((container_registry_expiration_policies_worker_capacity >= 0)),

doc/api/settings.md

@@ -79,6 +79,7 @@ Example response:
   "asset_proxy_whitelist": ["example.com", "*.example.com", "your-instance.com"],
   "asset_proxy_allowlist": ["example.com", "*.example.com", "your-instance.com"],
   "npm_package_requests_forwarding": true,
+  "pypi_package_requests_forwarding": true,
   "snippet_size_limit": 52428800,
   "issues_create_limit": 300,
   "raw_blob_request_limit": 300,
@@ -180,6 +181,7 @@ Example response:
   "allow_local_requests_from_web_hooks_and_services": true,
   "allow_local_requests_from_system_hooks": false,
   "npm_package_requests_forwarding": true,
+  "pypi_package_requests_forwarding": true,
   "snippet_size_limit": 52428800,
   "issues_create_limit": 300,
   "raw_blob_request_limit": 300,
@@ -347,6 +349,7 @@ listed in the descriptions of the relevant settings.
 | `mirror_max_capacity`                    | integer          | no                                   | **(PREMIUM)** Maximum number of mirrors that can be synchronizing at the same time. |
 | `mirror_max_delay`                       | integer          | no                                   | **(PREMIUM)** Maximum time (in minutes) between updates that a mirror can have when scheduled to synchronize. |
 | `npm_package_requests_forwarding`        | boolean          | no                                   | **(PREMIUM)** Use npmjs.org as a default remote repository when the package is not found in the GitLab Package Registry for npm. |
+| `pypi_package_requests_forwarding`       | boolean          | no                                   | **(PREMIUM)** Use pypi.org as a default remote repository when the package is not found in the GitLab Package Registry for PyPI. |
 | `outbound_local_requests_whitelist`      | array of strings | no                                   | Define a list of trusted domains or IP addresses to which local requests are allowed when local requests for hooks and services are disabled.
 | `pages_domain_verification_enabled`       | boolean          | no                                   | Require users to prove ownership of custom domains. Domain verification is an essential security measure for public GitLab sites. Users are required to demonstrate they control a domain before it is enabled. |
 | `password_authentication_enabled_for_git` | boolean         | no                                   | Enable authentication for Git over HTTP(S) via a GitLab account password. Default is `true`. |

doc/user/admin_area/settings/continuous_integration.md

@@ -262,10 +262,20 @@ To disable it:
 1. On the top bar, select **Menu >** **{admin}** **Admin**.
 1. On the left sidebar, select **Settings > CI/CD**.
 1. Expand the **Package Registry** section.
-1. Uncheck **Enable forwarding of npm package requests to npmjs.org**.
-1. Click **Save changes**.
+1. Clear the checkbox **Forward npm package requests to the npm Registry if the packages are not found in the GitLab Package Registry**.
+1. Select **Save changes**.
+
+### PyPI Forwarding **(PREMIUM SELF)**
+
+GitLab administrators can disable the forwarding of PyPI requests to [pypi.org](https://pypi.org/).
+
+To disable it:
 
-![npm package requests forwarding](img/admin_package_registry_npm_package_requests_forward.png)
+1. On the top bar, select **Menu >** **{admin}** **Admin**.
+1. On the left sidebar, select **Settings > CI/CD**.
+1. Expand the **Package Registry** section.
+1. Clear the checkbox **Forward PyPI package requests to the PyPI Registry if the packages are not found in the GitLab Package Registry**.
+1. Select **Save changes**.
 
 ### Package file size limits
 

doc/user/packages/pypi_repository/index.md

@@ -328,6 +328,11 @@ more than once, a `400 Bad Request` error occurs.
 
 ## Install a PyPI package
 
+In [GitLab 14.2 and later](https://gitlab.com/gitlab-org/gitlab/-/issues/233413),
+when a PyPI package is not found in the Package Registry, the request is forwarded to [pypi.org](https://pypi.org/).
+
+Administrators can disable this behavior in the [Continuous Integration settings](../../admin_area/settings/continuous_integration.md).
+
 ### Install from the project level
 
 To install the latest version of a package, use the following command:

ee/app/controllers/ee/admin/application_settings_controller.rb

@@ -47,7 +47,7 @@ module EE
           adjourned_deletion_for_projects_and_groups: [:delayed_project_deletion, :deletion_adjourned_period],
           required_ci_templates: :required_instance_ci_template,
           disable_name_update_for_users: :updating_name_disabled_for_users,
-          package_forwarding: :npm_package_requests_forwarding,
+          package_forwarding: [:npm_package_requests_forwarding, :pypi_package_requests_forwarding],
           default_branch_protection_restriction_in_groups: :group_owners_can_manage_default_branch_protection
         }.each do |license_feature, attribute_names|
           if License.feature_available?(license_feature)

ee/app/helpers/ee/application_settings_helper.rb

@@ -119,6 +119,7 @@ module EE
         deletion_adjourned_period
         updating_name_disabled_for_users
         npm_package_requests_forwarding
+        pypi_package_requests_forwarding
         maintenance_mode
         maintenance_mode_message
       ]

ee/app/views/admin/application_settings/_ee_package_registry.haml

@@ -7,6 +7,12 @@
         .form-check
           = f.check_box :npm_package_requests_forwarding, class: 'form-check-input'
           = f.label :npm_package_requests_forwarding, class: 'form-check-label' do
-            Forward npm package requests to the npm Registry if the packages are not found in the GitLab Package Registry
+            = _('Forward %{package_type} package requests to the %{registry_type} Registry if the packages are not found in the GitLab Package Registry') % { package_type: 'npm', registry_type: 'npm' }
+
+      .form-group
+        .form-check
+          = f.check_box :pypi_package_requests_forwarding, class: 'form-check-input'
+          = f.label :pypi_package_requests_forwarding, class: 'form-check-label' do
+            = _('Forward %{package_type} package requests to the %{registry_type} Registry if the packages are not found in the GitLab Package Registry') % { package_type: 'PyPI', registry_type: 'PyPI' }
 
     = f.submit _('Save changes'), class: 'btn gl-button btn-confirm'

ee/lib/ee/api/entities/application_setting.rb

@@ -20,6 +20,7 @@ module EE
           expose :deletion_adjourned_period, if: ->(_instance, _opts) { ::License.feature_available?(:adjourned_deletion_for_projects_and_groups) }
           expose :updating_name_disabled_for_users, if: ->(_instance, _opts) { ::License.feature_available?(:disable_name_update_for_users) }
           expose :npm_package_requests_forwarding, if: ->(_instance, _opts) { ::License.feature_available?(:package_forwarding) }
+          expose :pypi_package_requests_forwarding, if: ->(_instance, _opts) { ::License.feature_available?(:package_forwarding) }
           expose :group_owners_can_manage_default_branch_protection, if: ->(_instance, _opts) { ::License.feature_available?(:default_branch_protection_restriction_in_groups) }
           expose :maintenance_mode, if: ->(_instance, _opts) { ::Gitlab::Geo.license_allows? }
           expose :maintenance_mode_message, if: ->(_instance, _opts) { ::Gitlab::Geo.license_allows? }

ee/lib/ee/api/helpers/settings_helpers.rb

@@ -50,6 +50,7 @@ module EE
             optional :prevent_merge_requests_author_approval, type: Grape::API::Boolean, desc: 'Disable Merge request author ability to approve request.'
             optional :prevent_merge_requests_committers_approval, type: Grape::API::Boolean, desc: 'Disable Merge request committer ability to approve request.'
             optional :npm_package_requests_forwarding, type: Grape::API::Boolean, desc: 'NPM package requests are forwarded to npmjs.org if not found on GitLab.'
+            optional :pypi_package_requests_forwarding, type: Grape::API::Boolean, desc: 'PyPI package requests are forwarded to pypi.org if not found on GitLab.'
             optional :group_owners_can_manage_default_branch_protection, type: Grape::API::Boolean, desc: 'Allow owners to manage default branch protection in groups'
             optional :maintenance_mode, type: Grape::API::Boolean, desc: 'When instance is in maintenance mode, non-admin users can sign in with read-only access and make read-only API requests'
             optional :maintenance_mode_message, type: String, desc: 'Message displayed when instance is in maintenance mode'

ee/lib/ee/api/settings.rb

@@ -41,7 +41,7 @@ module EE
             end
 
             unless License.feature_available?(:package_forwarding)
-              attrs = attrs.except(:npm_package_requests_forwarding)
+              attrs = attrs.except(:npm_package_requests_forwarding, :pypi_package_requests_forwarding)
             end
 
             unless License.feature_available?(:default_branch_protection_restriction_in_groups)

ee/spec/controllers/admin/application_settings_controller_spec.rb

@@ -111,6 +111,13 @@ RSpec.describe Admin::ApplicationSettingsController do
       it_behaves_like 'settings for licensed features'
     end
 
+    context 'updating pypi packages request forwarding setting' do
+      let(:settings) { { pypi_package_requests_forwarding: true } }
+      let(:feature) { :package_forwarding }
+
+      it_behaves_like 'settings for licensed features'
+    end
+
     context 'updating `git_two_factor_session_expiry` setting' do
       before do
         stub_feature_flags(two_factor_for_cli: true)

ee/spec/features/admin/admin_settings_spec.rb

@@ -266,7 +266,7 @@ RSpec.describe 'Admin updates EE-only settings' do
       visit ci_cd_admin_application_settings_path
     end
 
-    it 'allows you to change the npm_forwaring setting' do
+    it 'allows you to change the npm_forwarding setting' do
       page.within('#js-package-settings') do
         check 'Forward npm package requests to the npm Registry if the packages are not found in the GitLab Package Registry'
         click_button 'Save'
@@ -274,6 +274,15 @@ RSpec.describe 'Admin updates EE-only settings' do
 
       expect(current_settings.npm_package_requests_forwarding).to be true
     end
+
+    it 'allows you to change the pypi_forwarding setting' do
+      page.within('#js-package-settings') do
+        check 'Forward PyPI package requests to the PyPI Registry if the packages are not found in the GitLab Package Registry'
+        click_button 'Save'
+      end
+
+      expect(current_settings.pypi_package_requests_forwarding).to be true
+    end
   end
 
   context 'sign up settings', :js do

lib/api/helpers/packages/dependency_proxy_helpers.rb

@@ -5,11 +5,17 @@ module API
     module Packages
       module DependencyProxyHelpers
         REGISTRY_BASE_URLS = {
-          npm: 'https://registry.npmjs.org/'
+          npm: 'https://registry.npmjs.org/',
+          pypi: 'https://pypi.org/simple/'
+        }.freeze
+
+        APPLICATION_SETTING_NAMES = {
+          npm: 'npm_package_requests_forwarding',
+          pypi: 'pypi_package_requests_forwarding'
         }.freeze
 
         def redirect_registry_request(forward_to_registry, package_type, options)
-          if forward_to_registry && redirect_registry_request_available?
+          if forward_to_registry && redirect_registry_request_available?(package_type)
             ::Gitlab::Tracking.event(self.options[:for].name, "#{package_type}_request_forward")
             redirect(registry_url(package_type, options))
           else
@@ -25,11 +31,20 @@ module API
           case package_type
           when :npm
             "#{base_url}#{options[:package_name]}"
+          when :pypi
+            "#{base_url}#{options[:package_name]}/"
           end
         end
 
-        def redirect_registry_request_available?
-          ::Gitlab::CurrentSettings.current_application_settings.npm_package_requests_forwarding
+        def redirect_registry_request_available?(package_type)
+          application_setting_name = APPLICATION_SETTING_NAMES[package_type]
+
+          raise ArgumentError, "Can't find application setting for package_type #{package_type}" unless application_setting_name
+
+          ::Gitlab::CurrentSettings
+            .current_application_settings
+            .attributes
+            .fetch(application_setting_name, false)
         end
       end
     end

lib/api/pypi_packages.rb

@@ -10,6 +10,7 @@ module API
     helpers ::API::Helpers::PackagesManagerClientsHelpers
     helpers ::API::Helpers::RelatedResourcesHelpers
     helpers ::API::Helpers::Packages::BasicAuthHelpers
+    helpers ::API::Helpers::Packages::DependencyProxyHelpers
     include ::API::Helpers::Packages::BasicAuthHelpers::Constants
 
     feature_category :package_registry
@@ -82,7 +83,11 @@ module API
 
           track_package_event('list_package', :pypi)
 
-          packages = Packages::Pypi::PackagesFinder.new(current_user, group, { package_name: params[:package_name] }).execute!
+          packages = Packages::Pypi::PackagesFinder.new(current_user, group, { package_name: params[:package_name] }).execute
+          empty_packages = packages.empty?
+
+          redirect_registry_request(empty_packages, :pypi, package_name: params[:package_name]) do
+            not_found!('Package') if empty_packages
             presenter = ::Packages::Pypi::PackagePresenter.new(packages, group)
 
             # Adjusts grape output format
@@ -94,6 +99,7 @@ module API
           end
         end
       end
+    end
 
     params do
       requires :id, type: String, desc: 'The ID of a project'
@@ -142,7 +148,11 @@ module API
 
           track_package_event('list_package', :pypi, project: authorized_user_project, namespace: authorized_user_project.namespace)
 
-          packages = Packages::Pypi::PackagesFinder.new(current_user, authorized_user_project, { package_name: params[:package_name] }).execute!
+          packages = Packages::Pypi::PackagesFinder.new(current_user, authorized_user_project, { package_name: params[:package_name] }).execute
+          empty_packages = packages.empty?
+
+          redirect_registry_request(empty_packages, :pypi, package_name: params[:package_name]) do
+            not_found!('Package') if empty_packages
             presenter = ::Packages::Pypi::PackagePresenter.new(packages, authorized_user_project)
 
             # Adjusts grape output format
@@ -152,6 +162,7 @@ module API
 
             body presenter.body
           end
+        end
 
         desc 'The PyPi Package upload endpoint' do
           detail 'This feature was introduced in GitLab 12.10'

locale/gitlab.pot

@@ -14551,6 +14551,9 @@ msgstr ""
 msgid "Format: %{dateFormat}"
 msgstr ""
 
+msgid "Forward %{package_type} package requests to the %{registry_type} Registry if the packages are not found in the GitLab Package Registry"
+msgstr ""
+
 msgid "Found errors in your %{gitlab_ci_yml}:"
 msgstr ""
 

spec/finders/packages/pypi/packages_finder_spec.rb

@@ -14,14 +14,14 @@ RSpec.describe Packages::Pypi::PackagesFinder do
 
   let(:package_name) { package2.name }
 
-  describe 'execute!' do
-    subject { described_class.new(user, scope, package_name: package_name).execute! }
+  describe 'execute' do
+    subject { described_class.new(user, scope, package_name: package_name).execute }
 
     shared_examples 'when no package is found' do
       context 'non-existing package' do
         let(:package_name) { 'none' }
 
-        it { expect { subject }.to raise_error(ActiveRecord::RecordNotFound) }
+        it { expect(subject).to be_empty }
       end
     end
 
@@ -29,7 +29,7 @@ RSpec.describe Packages::Pypi::PackagesFinder do
       context 'non-existing package' do
         let(:package_name) { package2.name.upcase.tr('-', '.') }
 
-        it { expect { subject }.to raise_error(ActiveRecord::RecordNotFound) }
+        it { expect(subject).to be_empty }
       end
     end
 
@@ -45,7 +45,7 @@ RSpec.describe Packages::Pypi::PackagesFinder do
     context 'within a group' do
       let(:scope) { group }
 
-      it { expect { subject }.to raise_error(ActiveRecord::RecordNotFound) }
+      it { expect(subject).to be_empty }
 
       context 'user with access to only one project' do
         before do

spec/lib/api/helpers/packages/dependency_proxy_helpers_spec.rb

@@ -5,7 +5,7 @@ require 'spec_helper'
 RSpec.describe API::Helpers::Packages::DependencyProxyHelpers do
   let_it_be(:helper) { Class.new.include(described_class).new }
 
-  describe 'redirect_registry_request' do
+  describe '#redirect_registry_request' do
     using RSpec::Parameterized::TableSyntax
 
     let(:options) { {} }
@@ -13,7 +13,7 @@ RSpec.describe API::Helpers::Packages::DependencyProxyHelpers do
     subject { helper.redirect_registry_request(forward_to_registry, package_type, options) { helper.fallback } }
 
     before do
-      allow(helper).to receive(:options).and_return(for: API::NpmInstancePackages)
+      allow(helper).to receive(:options).and_return(for: described_class)
     end
 
     shared_examples 'executing fallback' do
@@ -34,12 +34,15 @@ RSpec.describe API::Helpers::Packages::DependencyProxyHelpers do
 
         subject
 
-        expect_snowplow_event(category: 'API::NpmInstancePackages', action: 'npm_request_forward')
+        expect_snowplow_event(category: described_class.to_s, action: "#{package_type}_request_forward")
       end
     end
 
-    context 'with npm packages' do
-      let(:package_type) { :npm }
+    %i[npm pypi].each do |forwardable_package_type|
+      context "with #{forwardable_package_type} packages" do
+        include_context 'dependency proxy helpers context'
+
+        let(:package_type) { forwardable_package_type }
 
         where(:application_setting, :forward_to_registry, :example_name) do
           true  | true  | 'executing redirect'
@@ -50,22 +53,47 @@ RSpec.describe API::Helpers::Packages::DependencyProxyHelpers do
 
         with_them do
           before do
-          stub_application_setting(npm_package_requests_forwarding: application_setting)
+            allow_fetch_application_setting(attribute: "#{forwardable_package_type}_package_requests_forwarding", return_value: application_setting)
           end
 
           it_behaves_like params[:example_name]
         end
       end
+    end
 
-    context 'with non-forwardable packages' do
+    context 'with non-forwardable package type' do
       let(:forward_to_registry) { true }
 
       before do
         stub_application_setting(npm_package_requests_forwarding: true)
+        stub_application_setting(pypi_package_requests_forwarding: true)
       end
 
-      Packages::Package.package_types.keys.without('npm').each do |pkg_type|
+      Packages::Package.package_types.keys.without('npm', 'pypi').each do |pkg_type|
         context "#{pkg_type}" do
+          let(:package_type) { pkg_type.to_sym }
+
+          it 'raises an error' do
+            expect { subject }.to raise_error(ArgumentError, "Can't find application setting for package_type #{package_type}")
+          end
+        end
+      end
+    end
+
+    describe '#registry_url' do
+      subject { helper.registry_url(package_type, package_name: 'test') }
+
+      where(:package_type, :expected_result) do
+        :npm  | 'https://registry.npmjs.org/test'
+        :pypi | 'https://pypi.org/simple/test/'
+      end
+
+      with_them do
+        it { is_expected.to eq(expected_result) }
+      end
+
+      Packages::Package.package_types.keys.without('npm', 'pypi').each do |pkg_type|
+        context "with non-forwardable package type #{pkg_type}" do
           let(:package_type) { pkg_type }
 
           it 'raises an error' do

spec/requests/api/pypi_packages_spec.rb

@@ -23,7 +23,8 @@ RSpec.describe API::PypiPackages do
     subject { get api(url), headers: headers }
 
     describe 'GET /api/v4/groups/:id/-/packages/pypi/simple/:package_name' do
-      let(:url) { "/groups/#{group.id}/-/packages/pypi/simple/#{package.name}" }
+      let(:package_name) { package.name }
+      let(:url) { "/groups/#{group.id}/-/packages/pypi/simple/#{package_name}" }
       let(:snowplow_gitlab_standard_context) { {} }
 
       it_behaves_like 'pypi simple API endpoint'
@@ -40,7 +41,7 @@ RSpec.describe API::PypiPackages do
         it_behaves_like 'deploy token for package GET requests'
 
         context 'with group path as id' do
-          let(:url) { "/groups/#{CGI.escape(group.full_path)}/-/packages/pypi/simple/#{package.name}" }
+          let(:url) { "/groups/#{CGI.escape(group.full_path)}/-/packages/pypi/simple/#{package_name}"}
 
           it_behaves_like 'deploy token for package GET requests'
         end
@@ -60,7 +61,8 @@ RSpec.describe API::PypiPackages do
     end
 
     describe 'GET /api/v4/projects/:id/packages/pypi/simple/:package_name' do
-      let(:url) { "/projects/#{project.id}/packages/pypi/simple/#{package.name}" }
+      let(:package_name) { package.name }
+      let(:url) { "/projects/#{project.id}/packages/pypi/simple/#{package_name}" }
       let(:snowplow_gitlab_standard_context) { { project: project, namespace: project.namespace } }
 
       it_behaves_like 'pypi simple API endpoint'

spec/support/shared_contexts/lib/api/helpers/packages/dependency_proxy_helpers_shared_context.rb

+# frozen_string_literal: true
+
+RSpec.shared_context 'dependency proxy helpers context' do
+  def allow_fetch_application_setting(attribute:, return_value:)
+    attributes = double
+    allow(::Gitlab::CurrentSettings.current_application_settings).to receive(:attributes).and_return(attributes)
+    allow(attributes).to receive(:fetch).with(attribute, false).and_return(return_value)
+  end
+end

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

@@ -46,6 +46,8 @@ RSpec.shared_examples 'handling get metadata requests' do |scope: :project|
   end
 
   shared_examples 'handling all conditions' do
+    include_context 'dependency proxy helpers context'
+
     where(:auth, :package_name_type, :request_forward, :visibility, :user_role, :expected_result, :expected_status) do
       nil                    | :scoped_naming_convention    | true  | :public   | nil       | :accept   | :ok
       nil                    | :scoped_naming_convention    | false | :public   | nil       | :accept   | :ok
@@ -243,7 +245,7 @@ RSpec.shared_examples 'handling get metadata requests' do |scope: :project|
         project.send("add_#{user_role}", user) if user_role
         project.update!(visibility: visibility.to_s)
         package.update!(name: package_name) unless package_name == 'non-existing-package'
-        stub_application_setting(npm_package_requests_forwarding: request_forward)
+        allow_fetch_application_setting(attribute: "npm_package_requests_forwarding", return_value: request_forward)
       end
 
       example_name = "#{params[:expected_result]} metadata request"

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

@@ -10,9 +10,10 @@ end
 
 RSpec.shared_examples 'accept package tags request' do |status:|
   using RSpec::Parameterized::TableSyntax
+  include_context 'dependency proxy helpers context'
 
   before do
-    stub_application_setting(npm_package_requests_forwarding: false)
+    allow_fetch_application_setting(attribute: "npm_package_requests_forwarding", return_value: false)
   end
 
   context 'with valid package name' do

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

@@ -228,6 +228,35 @@ RSpec.shared_examples 'pypi simple API endpoint' do
 
     it_behaves_like 'PyPI package versions', :developer, :success
   end
+
+  context 'package request forward' do
+    include_context 'dependency proxy helpers context'
+
+    where(:forward, :package_in_project, :shared_examples_name, :expected_status) do
+      true  | true  | 'PyPI package versions'    | :success
+      true  | false | 'process PyPI api request' | :redirect
+      false | true  | 'PyPI package versions'    | :success
+      false | false | 'process PyPI api request' | :not_found
+    end
+
+    with_them do
+      let_it_be(:package) { create(:pypi_package, project: project, name: 'foobar') }
+
+      let(:package_name) do
+        if package_in_project
+          'foobar'
+        else
+          'barfoo'
+        end
+      end
+
+      before do
+        allow_fetch_application_setting(attribute: "pypi_package_requests_forwarding", return_value: forward)
+      end
+
+      it_behaves_like params[:shared_examples_name], :reporter, params[:expected_status]
+    end
+  end
 end
 
 RSpec.shared_examples 'pypi file download endpoint' do