Merge branch 'rc/customers_dot_proxy' into 'master'

Add basic proxy for customers dot

See merge request gitlab-org/gitlab!56577

app/controllers/customers_dot/proxy_controller.rb

+# frozen_string_literal: true
+
+module CustomersDot
+  class ProxyController < ApplicationController
+    skip_before_action :authenticate_user!
+    skip_before_action :verify_authenticity_token
+
+    feature_category :purchase
+
+    BASE_URL = Gitlab::SubscriptionPortal::SUBSCRIPTIONS_URL
+
+    def graphql
+      response = Gitlab::HTTP.post("#{BASE_URL}/graphql",
+        body: request.raw_post,
+        headers: { 'Content-Type' => 'application/json' }
+      )
+
+      render json: response.body, status: response.code
+    end
+  end
+end

config/routes.rb

@@ -284,6 +284,7 @@ Rails.application.routes.draw do
 
   draw :git_http
   draw :api
+  draw :customers_dot
   draw :sidekiq
   draw :help
   draw :google_api

config/routes/customers_dot.rb

+# frozen_string_literal: true
+
+scope '-' do
+  namespace :customers_dot do
+    post 'proxy/graphql' => 'proxy#graphql'
+  end
+end

spec/requests/customers_dot/proxy_controller_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe CustomersDot::ProxyController, type: :request do
+  describe 'POST graphql' do
+    let_it_be(:customers_dot) { "#{Gitlab::SubscriptionPortal::SUBSCRIPTIONS_URL}/graphql" }
+
+    it 'forwards request body to customers dot' do
+      request_params = '{ "foo" => "bar" }'
+
+      stub_request(:post, customers_dot)
+
+      post customers_dot_proxy_graphql_path, params: request_params
+
+      expect(WebMock).to have_requested(:post, customers_dot).with(body: request_params)
+    end
+
+    it 'responds with customers dot status' do
+      stub_request(:post, customers_dot).to_return(status: 500)
+
+      post customers_dot_proxy_graphql_path
+
+      expect(response).to have_gitlab_http_status(:internal_server_error)
+    end
+
+    it 'responds with customers dot response body' do
+      customers_dot_response = 'foo'
+
+      stub_request(:post, customers_dot).to_return(body: customers_dot_response)
+
+      post customers_dot_proxy_graphql_path
+
+      expect(response.body).to eq(customers_dot_response)
+    end
+  end
+end