[30] Proxy Static Pages

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)
@@ -396,6 +399,7 @@ 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 +1,61 @@
+class PagesController < ApplicationController
+  include ReverseProxy::Controller
+  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"
+  #HOST = "https://www.challenge.gov"
+  #BASE_URL = "/"
+
+  def index
+    path = "#{BASE_URL}#{params[:path]}/"
+    reverse_proxy HOST, path: path, reset_accept_encoding: true, headers: { 'host' => DOMAIN } do |config|
+      config.on_missing do |code, response|
+        redirect_to "/dashboard" and return
+      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: path, reset_accept_encoding: true, headers: { 'host' => DOMAIN } do |config|
+      end
+    end
+  end
+
+  def root
+    path = BASE_URL
+    reverse_proxy HOST, path: 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 = html.gsub(HOST, "/")
+    if BASE_URL.length > 1
+      parsed_html = html.gsub(BASE_URL, "/")
+    end
+    parsed_html.html_safe
+  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 +34,15 @@
   # 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
+
+  match '/assets/*path.:ext' => 'pages#assets', via: [:get]
+  match '/*path' => 'pages#index', via: [:get]
+  match '/' => 'pages#root', via: [:get]
 end