Include whether the actor is a GeoNode in the `/internal/allowed` endpoint

This is needed to support #2959: gitlab-shell or Gitaly will need
to know whether the request is coming from a GeoNode, in which
case we will have some way of disabling the `transfer.hideRefs`
git command in order to mirror all the refs on the primary.

lib/api/internal.rb

@@ -48,7 +48,8 @@ module API
           status: true,
           gl_repository: gl_repository,
           repository_path: repository_path,
-          gitaly: gitaly_payload(params[:action])
+          gitaly: gitaly_payload(params[:action]),
+          geo_node: actor.is_a?(GeoNodeKey)
         }
       end
 

spec/requests/api/ee/internal_spec.rb

+require 'spec_helper'
+
+describe API::Internal do # rubocop:disable RSpec/FilePath
+  let(:project) { create(:project, :repository) }
+  let(:secret_token) { Gitlab::Shell.secret_token }
+
+  describe "POST /internal/allowed", :clean_gitlab_redis_shared_state do
+    context 'Geo Node' do
+      let(:geo_node) { create(:geo_node) }
+
+      it 'recognizes the Geo Node' do
+        post(
+          api("/internal/allowed"),
+          key_id: geo_node.geo_node_key.id,
+          project: project.repository.path_to_repo,
+          action: 'git-upload-pack',
+          secret_token: secret_token,
+          protocol: 'ssh')
+
+        expect(response.status).to eq(200)
+        expect(json_response['geo_node']).to be(true)
+      end
+    end
+
+    context 'user' do
+      let(:user) { create(:user) }
+      let(:key) { create(:key, user: user) }
+
+      before do
+        project.team << [user, :developer]
+      end
+
+      it 'does not recognize key as a Geo Node' do
+        post(
+          api("/internal/allowed"),
+          key_id: key.id,
+          project: project.repository.path_to_repo,
+          action: 'git-upload-pack',
+          secret_token: secret_token,
+          protocol: 'ssh')
+
+        expect(response.status).to eq(200)
+        expect(json_response['geo_node']).to be(false)
+      end
+    end
+  end
+end