Add Debian Component Regexp

lib/api/debian_package_endpoints.rb

@@ -80,7 +80,7 @@ module API
         end
 
         params do
-          requires :component, type: String, desc: 'The Debian Component'
+          requires :component, type: String, desc: 'The Debian Component', regexp: Gitlab::Regex.debian_component_regex
           requires :architecture, type: String, desc: 'The Debian Architecture', regexp: Gitlab::Regex.debian_architecture_regex
         end
 
@@ -99,7 +99,7 @@ module API
       end
 
       params do
-        requires :component, type: String, desc: 'The Debian Component'
+        requires :component, type: String, desc: 'The Debian Component', regexp: Gitlab::Regex.debian_component_regex
         requires :letter, type: String, desc: 'The Debian Classification (first-letter or lib-first-letter)'
         requires :source_package, type: String, desc: 'The Debian Source Package Name', regexp: Gitlab::Regex.debian_package_name_regex
       end

lib/gitlab/regex.rb

@@ -90,6 +90,10 @@ module Gitlab
         @debian_distribution_regex ||= %r{\A[a-z0-9][a-z0-9\.-]*\z}i.freeze
       end
 
+      def debian_component_regex
+        @debian_component_regex ||= %r{#{debian_distribution_regex}}.freeze
+      end
+
       def unbounded_semver_regex
         # See the official regex: https://semver.org/#is-there-a-suggested-regular-expression-regex-to-check-a-semver-string
 

spec/lib/gitlab/regex_spec.rb

@@ -535,6 +535,19 @@ RSpec.describe Gitlab::Regex do
     it { is_expected.not_to match('hé') }
   end
 
+  describe '.debian_component_regex' do
+    subject { described_class.debian_component_regex }
+
+    it { is_expected.to match('main') }
+    it { is_expected.to match('non-free') }
+
+    # Do not allow slash
+    it { is_expected.not_to match('non/free') }
+
+    # Do not allow Unicode
+    it { is_expected.not_to match('hé') }
+  end
+
   describe '.semver_regex' do
     subject { described_class.semver_regex }