Fix get a single pages domain when project path contains a period

changelogs/unreleased/40668-pages-domain-api-returns-404-when-using-a-specific-domain.yml

+---
+title: Fix get a single pages domain when project path contains a period
+merge_request: 17206
+author: Travis Miller
+type: fixed

lib/api/pages_domains.rb

@@ -2,6 +2,8 @@ module API
   class PagesDomains < Grape::API
     include PaginationParams
 
+    PAGES_DOMAINS_ENDPOINT_REQUIREMENTS = API::PROJECT_ENDPOINT_REQUIREMENTS.merge(domain: API::NO_SLASH_URL_PART_REGEX)
+
     before do
       authenticate!
     end
@@ -48,7 +50,7 @@ module API
     params do
       requires :id, type: String, desc: 'The ID of a project'
     end
-    resource :projects, requirements: { id: %r{[^/]+} } do
+    resource :projects, requirements: API::PROJECT_ENDPOINT_REQUIREMENTS do
       before do
         require_pages_enabled!
       end
@@ -71,7 +73,7 @@ module API
       params do
         requires :domain, type: String, desc: 'The domain'
       end
-      get ":id/pages/domains/:domain", requirements: { domain: %r{[^/]+} } do
+      get ":id/pages/domains/:domain", requirements: PAGES_DOMAINS_ENDPOINT_REQUIREMENTS do
         authorize! :read_pages, user_project
 
         present pages_domain, with: Entities::PagesDomain
@@ -105,7 +107,7 @@ module API
         optional :certificate, allow_blank: false, types: [File, String], desc: 'The certificate'
         optional :key, allow_blank: false, types: [File, String], desc: 'The key'
       end
-      put ":id/pages/domains/:domain", requirements: { domain: %r{[^/]+} } do
+      put ":id/pages/domains/:domain", requirements: PAGES_DOMAINS_ENDPOINT_REQUIREMENTS do
         authorize! :update_pages, user_project
 
         pages_domain_params = declared(params, include_parent_namespaces: false)
@@ -126,7 +128,7 @@ module API
       params do
         requires :domain, type: String, desc: 'The domain'
       end
-      delete ":id/pages/domains/:domain", requirements: { domain: %r{[^/]+} } do
+      delete ":id/pages/domains/:domain", requirements: PAGES_DOMAINS_ENDPOINT_REQUIREMENTS do
         authorize! :update_pages, user_project
 
         status 204

spec/requests/api/pages_domains_spec.rb

 require 'rails_helper'
 
 describe API::PagesDomains do
-  set(:project) { create(:project) }
+  set(:project) { create(:project, path: 'my.project') }
   set(:user) { create(:user) }
   set(:admin) { create(:admin) }
 
@@ -16,6 +16,7 @@ describe API::PagesDomains do
 
   let(:route) { "/projects/#{project.id}/pages/domains" }
   let(:route_domain) { "/projects/#{project.id}/pages/domains/#{pages_domain.domain}" }
+  let(:route_domain_path) { "/projects/#{project.path_with_namespace.gsub('/', '%2F')}/pages/domains/#{pages_domain.domain}" }
   let(:route_secure_domain) { "/projects/#{project.id}/pages/domains/#{pages_domain_secure.domain}" }
   let(:route_expired_domain) { "/projects/#{project.id}/pages/domains/#{pages_domain_expired.domain}" }
   let(:route_vacant_domain) { "/projects/#{project.id}/pages/domains/www.vacant-domain.test" }
@@ -144,6 +145,16 @@ describe API::PagesDomains do
         expect(json_response['certificate']).to be_nil
       end
 
+      it 'returns pages domain with project path' do
+        get api(route_domain_path, user)
+
+        expect(response).to have_gitlab_http_status(200)
+        expect(response).to match_response_schema('public_api/v4/pages_domain/detail')
+        expect(json_response['domain']).to eq(pages_domain.domain)
+        expect(json_response['url']).to eq(pages_domain.url)
+        expect(json_response['certificate']).to be_nil
+      end
+
       it 'returns pages domain with a certificate' do
         get api(route_secure_domain, user)