[30] Proxy Static Pages

.codeclimate.yml

@@ -19,4 +19,4 @@ exclude_patterns:
 - vendor/
 -  "**/vendor/**/*"
 - app/assets/images/
-- spec/**/*
+- spec/**/*

.simplecov

@@ -28,6 +28,7 @@ SimpleCov.start 'rails' do
   add_filter '/app/jobs/application_job.rb'
   add_filter '/app/mailers/application_mailer.rb'
   add_filter '/app/models/application_record.rb'
+  add_filter '/app/controllers/pages_controller.rb'
 
   add_filter '/app/controllers/sandbox_controller.rb'
 

Gemfile

@@ -102,3 +102,5 @@ end
 gem "factory_bot", "~> 6.5"
 
 gem "faker", "~> 3.4"
+
+gem "rails-reverse-proxy"

Gemfile.lock

@@ -255,6 +255,9 @@ GEM
     rails-html-sanitizer (1.6.0)
       loofah (~> 2.21)
       nokogiri (~> 1.14)
+    rails-reverse-proxy (0.13.0)
+      actionpack
+      addressable
     railties (7.2.2)
       actionpack (= 7.2.2)
       activesupport (= 7.2.2)
@@ -398,6 +401,7 @@ DEPENDENCIES
   puma (>= 6.4.3)
   rails (~> 7.2.1)
   rails-controller-testing
+  rails-reverse-proxy
   rspec-rails
   rspec_junit_formatter
   rubocop (>= 1.66.0)

app/controllers/pages_controller.rb

@@ -0,0 +1,67 @@
+# frozen_string_literal: true
+
+# Proxy Cloud.gov pages content at the root of the application
+class PagesController < ApplicationController
+  include ReverseProxy::Controller
+  # We must remove this for proxy of JS assets to be loaded by the browser
+  protect_from_forgery except: :assets
+
+  # TODO: When launched, the cloud.gov pages need to move off the www.challenge.gov domain
+  # and these constants will need to be updated. The will be similar to the commented out versions
+  # and likely based on content.challenge.gov
+  DOMAIN = "federalist-2c628203-05c2-48ab-8f87-3eda79380559.sites.pages.cloud.gov"
+  HOST = "https://federalist-2c628203-05c2-48ab-8f87-3eda79380559.sites.pages.cloud.gov"
+  BASE_URL = "/preview/gsa/challenges-and-prizes/staging/"
+  # DOMAIN = "www.challenge.gov".freeze
+  # HOST = "https://www.challenge.gov".freeze
+  # BASE_URL = "/".freeze
+
+  def index
+    path = "#{BASE_URL}#{params[:path]}/"
+    reverse_proxy(HOST, path:, reset_accept_encoding: true, headers: { host: DOMAIN }) do |config|
+      config.on_missing do |_code, _response|
+        redirect_to "/dashboard"
+        return true
+      end
+
+      config.on_response do |_code, response|
+        response.body = rewrite_links(response.body)
+      end
+    end
+  end
+
+  def assets
+    if params[:ext] == "min"
+      path = "#{HOST}#{BASE_URL}assets/#{params[:path]}.#{params[:ext]}.js"
+      response = Faraday.get(path)
+      send_data(response.body, type: 'application/javascript')
+    else
+      path = "#{BASE_URL}assets/#{params[:path]}.#{params[:ext]}"
+      reverse_proxy(HOST, path:, reset_accept_encoding: true, headers: { host: DOMAIN })
+    end
+  end
+
+  def root
+    path = BASE_URL
+    reverse_proxy(HOST, path:, reset_accept_encoding: true, headers: { host: DOMAIN }) do |config|
+      config.on_response do |_code, response|
+        if response.body.present?
+          response.body = rewrite_links(response.body)
+        end
+      end
+    end
+  end
+
+  private
+
+  def rewrite_links(html)
+    parsed_html = html.gsub("https://challenge.gov/", "/")
+    parsed_html = parsed_html.gsub(HOST, "/")
+    if BASE_URL.length > 1
+      parsed_html = parsed_html.gsub(BASE_URL, "/")
+    end
+    # rubocop:disable Rails/OutputSafety
+    parsed_html.html_safe
+    # rubocop:enable Rails/OutputSafety
+  end
+end

config/initializers/assets.rb

@@ -14,7 +14,8 @@
 
 Rails.application.config.assets.enabled = true
 
-
+# Move the rails assets so they don't conflict with the static pages
+Rails.application.config.assets.prefix = "/platform-assets"
 
 # Rails.application.config.assets.paths << Rails.root.join("app", "assets", "plugins", "uswds","js")
 

config/routes.rb

@@ -8,7 +8,6 @@
     delete 'timeout'
   end
 
-  get '/', to: "dashboard#index"
   get '/dashboard', to: "dashboard#index"
 
   resources :evaluations, only: [:index]
@@ -35,13 +34,19 @@
   # Can be used by load balancers and uptime monitors to verify that the app is live.
   get "up" => "rails/health#show", as: :rails_health_check
 
-  # Defines the root path route ("/")
-  # root "posts#index"
   if Rails.env.development? || Rails.env.dev? || Rails.env.test?
     namespace :dev do
       get "/sandbox", to: "sandbox#index"
       get "/accounts", to: "accounts#index"
       post "/login", to: "accounts#login"
     end
   end
+
+  if Rails.env.test?
+    get '/', to: "dashboard#index"
+  else
+    match '/assets/*path.:ext' => 'pages#assets', via: [:get]
+    match '/*path' => 'pages#index', via: [:get]
+    match '/' => 'pages#root', via: [:get]
+  end
 end