Add the most boring pages API implementation

3 files changed, 83 insertions, 0 deletions

diff --git a/lib/api/api.rb b/lib/api/api.rb
index bf8ddba6f0d..1719010ab48 100644
--- a/lib/api/api.rb
+++ b/lib/api/api.rb
@@ -115,6 +115,7 @@ module API
     mount ::API::GroupVariables
     mount ::API::ImportGithub
     mount ::API::Internal
+    mount ::API::Internals::Pages
     mount ::API::Issues
     mount ::API::JobArtifacts
     mount ::API::Jobs
diff --git a/lib/api/internals/pages.rb b/lib/api/internals/pages.rb
new file mode 100644
index 00000000000..a8631827b3d
--- /dev/null
+++ b/lib/api/internals/pages.rb
@@ -0,0 +1,82 @@
+# frozen_string_literal: true
+
+module API
+  module Internals
+    class Pages < Grape::API
+      namespace 'internals' do
+        params do
+          requires :host, type: String, desc: 'The Pages host'
+        end
+        get 'pages/query' do
+          if namespace_name = find_namespace_name(params[:host])
+            namespace_domain(namespace_name, params[:host].downcase)
+          elsif domain = find_user_domain(params[:host])
+            user_domain(domain)
+          else
+            status :not_found
+          end
+        end
+      end
+
+      helpers do
+        def namespace_domain(namespace_name, host)
+          lookup_paths = []
+
+          if namespace = Namespace.find_by_full_path(namespace_name)
+            namespace.all_projects.with_pages.each do |project|
+              prefix = project.full_path.delete_prefix(namespace.full_path)
+              lookup_paths << project_params(project, prefix)
+            end
+
+            lookup_paths << namespace_project_params(namespace, host, "")
+          end
+
+          status :ok
+
+          { lookup_paths: lookup_paths.compact }
+        end
+
+        def user_domain(domain)
+          lookup_paths = []
+          lookup_paths << project_params(domain.project, "")
+
+          status :ok
+
+          {
+            certificate: domain.certificate,
+            key: domain.certificate_key,
+            lookup_paths: lookup_paths.compact
+          }
+        end
+
+        def find_namespace_name(host)
+          host = host.downcase
+          gitlab_host = "." + ::Settings.pages.host.downcase
+          host.delete_suffix(gitlab_host) if host.ends_with?(gitlab_host)
+        end
+
+        def find_user_domain(host)
+          PagesDomain.find_by(domain: host.downcase)
+        end
+
+        def namespace_project_params(namespace, project_name, prefix)
+          project = namespace.projects.with_pages.find_by(path: project_name)
+          project_params(project, prefix)
+        end
+
+        def project_params(project, prefix)
+          return unless project
+          return unless project.pages_deployed?
+
+          {
+            https_only: project.pages_https_only?,
+            project_id: project.project_id,
+            access_control: !project.public_pages?,
+            prefix: "#{prefix}/",
+            path: "#{project.public_pages_path}/"
+          }
+        end
+      end
+    end
+  end
+end
diff --git a/lib/api/pages.rb b/lib/api/pages.rb
new file mode 100644
index 00000000000..e69de29bb2d
--- /dev/null
+++ b/lib/api/pages.rb