Add PyPI package endpoints for project and group path (escaped)

Changelog: added

doc/user/packages/pypi_repository/index.md

@@ -181,7 +181,9 @@ username = <your_personal_access_token_name>
 password = <your_personal_access_token>
 ```
 
-- Your project ID is on your project's home page.
+The `<project_id>` is either the project's
+[URL-encoded](../../../api/index.md#namespaced-path-encoding)
+path (for example, `group%2Fproject`), or the project's ID (for example `42`).
 
 ### Authenticate with a deploy token
 
@@ -198,7 +200,9 @@ username = <deploy token username>
 password = <deploy token>
 ```
 
-Your project ID is on your project's home page.
+The `<project_id>` is either the project's
+[URL-encoded](../../../api/index.md#namespaced-path-encoding)
+path (for example, `group%2Fproject`), or the project's ID (for example `42`).
 
 ### Authenticate with a CI job token
 
@@ -335,7 +339,8 @@ pip install --index-url https://<personal_access_token_name>:<personal_access_to
 - `<package_name>` is the package name.
 - `<personal_access_token_name>` is a personal access token name with the `read_api` scope.
 - `<personal_access_token>` is a personal access token with the `read_api` scope.
-- `<project_id>` is the project ID.
+- `<project_id>` is either the project's [URL-encoded](../../../api/index.md#namespaced-path-encoding)
+  path (for example, `group%2Fproject`), or the project's ID (for example `42`).
 
 In these commands, you can use `--extra-index-url` instead of `--index-url`. However, using
 `--extra-index-url` makes you vulnerable to dependency confusion attacks because it checks the PyPi

lib/api/pypi_packages.rb

@@ -40,7 +40,7 @@ module API
     end
 
     params do
-      requires :id, type: Integer, desc: 'The ID of a group'
+      requires :id, type: String, desc: 'The ID of a group'
     end
     resource :groups, requirements: API::NAMESPACE_OR_PROJECT_REQUIREMENTS do
       after_validation do
@@ -96,7 +96,7 @@ module API
     end
 
     params do
-      requires :id, type: Integer, desc: 'The ID of a project'
+      requires :id, type: String, desc: 'The ID of a project'
     end
 
     resource :projects, requirements: API::NAMESPACE_OR_PROJECT_REQUIREMENTS do

spec/requests/api/pypi_packages_spec.rb

@@ -38,6 +38,12 @@ RSpec.describe API::PypiPackages do
         end
 
         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}" }
+
+          it_behaves_like 'deploy token for package GET requests'
+        end
       end
 
       context 'job token' do
@@ -61,6 +67,12 @@ RSpec.describe API::PypiPackages do
       it_behaves_like 'rejects PyPI access with unknown project id'
       it_behaves_like 'deploy token for package GET requests'
       it_behaves_like 'job token for package GET requests'
+
+      context 'with project path as id' do
+        let(:url) { "/projects/#{CGI.escape(project.full_path)}/packages/pypi/simple/#{package.name}" }
+
+        it_behaves_like 'deploy token for package GET requests'
+      end
     end
   end