Add host-based routing constraints

This allows us to separate routing between the School Placements service and the Track & Pay service.

.env.example

@@ -2,3 +2,6 @@ POSTGRES_PASSWORD=password
 DATABASE_URL=postgres://postgres:$POSTGRES_PASSWORD@localhost:5432
 GOVUK_NOTIFY_API_KEY=
 SIGN_IN_METHOD=persona
+
+PLACEMENTS_HOST=placements.localhost
+CLAIMS_HOST=claims.localhost

app/controllers/claims/pages_controller.rb

@@ -0,0 +1,2 @@
+class Claims::PagesController < ApplicationController
+end

app/controllers/placements/pages_controller.rb

@@ -0,0 +1,2 @@
+class Placements::PagesController < ApplicationController
+end

app/helpers/application_helper.rb

@@ -1,2 +1,10 @@
 module ApplicationHelper
+  def current_service
+    case request.host
+    when ENV["CLAIMS_HOST"]
+      :claims
+    when ENV["PLACEMENTS_HOST"]
+      :placements
+    end
+  end
 end

app/views/claims/pages/index.html.erb

@@ -0,0 +1,26 @@
+<div class="govuk-grid-row">
+  <div class="govuk-grid-column-two-thirds">
+    <h1 class="govuk-heading-xl">It works! 🎉</h1>
+
+    <p class="govuk-body">
+      Your application is ready - so long as this page rendered without any errors you're good to go.
+    </p>
+
+    <%= govuk_summary_list(
+      rows: [
+        { key: { text: "Service" }, value: { text: "Claims" } },
+        { key: { text: "Rails version" }, value: { text:  Rails.version } },
+        { key: { text: "Ruby version" }, value: { text:  RUBY_VERSION } },
+        { key: {
+          text: "GOV.UK Frontend" },
+          value: {
+            text: JSON
+              .parse(File.read(Rails.root.join("package.json")))
+              .dig("dependencies", "govuk-frontend")
+              .tr("^", "")
+          }
+        }
+      ]
+    ) %>
+  </div>
+</div>

app/views/layouts/application.html.erb

@@ -27,11 +27,7 @@
 
     <%= govuk_skip_link %>
 
-    <%= govuk_header(service_name: "GOV.UK Rails Boilerplate") do |header| %>
-      <%= header.with_navigation_item(text: "Navigation item 1", href: "#", active: true) %>
-      <%= header.with_navigation_item(text: "Navigation item 2", href: "#") %>
-      <%= header.with_navigation_item(text: "Navigation item 3", href: "#") %>
-    <% end %>
+    <%= govuk_header(homepage_url: "https://www.gov.uk", service_name: t(".#{current_service}.header.service_name"), service_url: "/") %>
 
     <div class="govuk-width-container">
       <main class="govuk-main-wrapper" id="main-content" role="main">

app/views/placements/pages/index.html.erb

@@ -0,0 +1,26 @@
+<div class="govuk-grid-row">
+  <div class="govuk-grid-column-two-thirds">
+    <h1 class="govuk-heading-xl">It works! 🎉</h1>
+
+    <p class="govuk-body">
+      Your application is ready - so long as this page rendered without any errors you're good to go.
+    </p>
+
+    <%= govuk_summary_list(
+      rows: [
+        { key: { text: "Service" }, value: { text: "Placements" } },
+        { key: { text: "Rails version" }, value: { text:  Rails.version } },
+        { key: { text: "Ruby version" }, value: { text:  RUBY_VERSION } },
+        { key: {
+          text: "GOV.UK Frontend" },
+          value: {
+            text: JSON
+              .parse(File.read(Rails.root.join("package.json")))
+              .dig("dependencies", "govuk-frontend")
+              .tr("^", "")
+          }
+        }
+      ]
+    ) %>
+  </div>
+</div>

config/locales/claims/en/layouts/application.yml

@@ -0,0 +1,6 @@
+en:
+  layouts:
+    application:
+      claims:
+        header:
+          service_name: Claim Funding for General Mentors

config/locales/placements/en/layouts/application.yml

@@ -0,0 +1,6 @@
+en:
+  layouts:
+    application:
+      placements:
+        header:
+          service_name: Manage School Placements

config/routes.rb

@@ -1,10 +1,4 @@
 Rails.application.routes.draw do
-  root to: "pages#home"
-  # Define your application routes per the DSL in https://guides.rubyonrails.org/routing.html
-
-  # Defines the root path route ("/")
-  # root "articles#index"
-
   scope via: :all do
     get "/404", to: "errors#not_found"
     get "/422", to: "errors#unprocessable_entity"
@@ -19,4 +13,7 @@
   get("/personas", to: "personas#index")
   get("/auth/developer/sign-out", to: "sessions#signout")
   post("/auth/developer/callback", to: "sessions#callback")
+
+  draw :placements
+  draw :claims
 end

config/routes/claims.rb

@@ -0,0 +1,3 @@
+scope module: :claims, as: :claims, constraints: { host: ENV["CLAIMS_HOST"] } do
+  root to: "pages#index"
+end

config/routes/placements.rb

@@ -0,0 +1,3 @@
+scope module: :placements, as: :placements, constraints: { host: ENV["PLACEMENTS_HOST"] } do
+  root to: "pages#index"
+end

spec/requests/pages_spec.rb

@@ -2,7 +2,7 @@
 
 RSpec.describe "Pages", type: :request do
   describe "GET /home" do
-    it "returns http success" do
+    xit "returns http success" do
       get "/"
       expect(response).to have_http_status(:success)
     end

spec/system/home_page_spec.rb

@@ -0,0 +1,57 @@
+require "rails_helper"
+
+RSpec.feature "Home Page" do
+  after do
+    Capybara.app_host = nil
+  end
+
+  scenario "User visits the claims homepage" do
+    given_i_am_on_the_claims_site
+    and_i_am_on_the_start_page
+    i_can_see_the_claims_service_name_in_the_header
+    and_i_can_see_the_claims_service_value_in_the_page
+  end
+
+  scenario "User visits the placements homepage" do
+    given_i_am_on_the_placements_site
+    and_i_am_on_the_start_page
+    i_can_see_the_placements_service_name_in_the_header
+    and_i_can_see_the_placements_service_value_in_the_page
+  end
+
+  private
+
+  def given_i_am_on_the_claims_site
+    ENV["CLAIMS_HOST"] = "claims.localhost"
+    Capybara.app_host = "http://#{ENV["CLAIMS_HOST"]}"
+  end
+
+  def given_i_am_on_the_placements_site
+    ENV["PLACEMENTS_HOST"] = "placements.localhost"
+    Capybara.app_host = "http://#{ENV["PLACEMENTS_HOST"]}"
+  end
+
+  def and_i_am_on_the_start_page
+    visit "/"
+  end
+
+  def i_can_see_the_claims_service_name_in_the_header
+    within(".govuk-header") do
+      expect(page).to have_content("Claim Funding for General Mentors")
+    end
+  end
+
+  def i_can_see_the_placements_service_name_in_the_header
+    within(".govuk-header") do
+      expect(page).to have_content("Manage School Placements")
+    end
+  end
+
+  def and_i_can_see_the_claims_service_value_in_the_page
+    expect(page).to have_css(".govuk-summary-list__value", text: "Claims")
+  end
+
+  def and_i_can_see_the_placements_service_value_in_the_page
+    expect(page).to have_css(".govuk-summary-list__value", text: "Placements")
+  end
+end