WIP merge hardcoded bits content into content items

app/controllers/organisations_controller.rb

@@ -4,6 +4,7 @@ class OrganisationsController < ApplicationController
     set_expiry content_item.max_age, public_cache: content_item.public_cache
   end
   around_action :switch_locale, only: %i[show court]
+  after_action :override_theme
 
   def index
     @organisations = ContentStoreOrganisations.find!("/government/organisations")
@@ -52,4 +53,17 @@ def presented_organisations
   def locale
     ".#{params[:locale]}" if params[:locale]
   end
+
+  def override_theme
+    theme_config = @content_item.dig("details", "theme_config")
+    if theme_config.present?
+      layout = theme_config["layout"]
+      case layout
+      when "full_width"
+        response.headers[Slimmer::Headers::TEMPLATE_HEADER] = "gem_layout_full_width"
+      else
+        raise "Unrecognised layout #{layout.inspect}"
+      end
+    end
+  end
 end

app/models/content_item.rb

@@ -8,6 +8,24 @@ def self.find!(base_path)
       "max_age" => content_item.cache_control["max-age"],
       "public" => !content_item.cache_control.private?,
     }
+    # See if we're extending this content item
+    content_id = content_item["content_id"]
+    content_extensions = []
+    if content_id.present?
+      Dir.glob(Rails.root.join("data", "content_extensions", content_id, "*.yaml")) do |filename|
+        content_extensions << YAML.load_file(filename)
+      end
+      Dir.glob(Rails.root.join("data", "theme_overrides", content_id, "theme.yaml")) do |filename|
+        theme_config = YAML.load_file(filename)
+        details = content_item_hash["details"]
+        details["theme_config"] = theme_config if details.present?
+      end
+    end
+    if content_extensions.any?
+      links = content_item_hash.fetch("links", {})
+      links["content_extensions"] = content_extensions
+      content_item_hash["links"] = links
+    end
     new(content_item_hash)
   end
 
@@ -21,6 +39,12 @@ def initialize(content_item_data)
     end
   end
 
+  %i[content_extensions].each do |field|
+    define_method field do
+      (@content_item_data["links"] || {})[field.to_s]
+    end
+  end
+
   def details
     @content_item_data["details"] || {}
   end

app/models/organisation.rb

@@ -3,7 +3,8 @@
 class Organisation
   include ActiveModel::Model
 
   attr_reader :content_item
+  delegate :content_extensions, to: :content_item
 
   HMCTS_CONTENT_ID = "6f757605-ab8f-4b62-84e4-99f79cf085c2".freeze
 

app/views/organisations/show.html.erb

@@ -1,6 +1,11 @@
 <% add_view_stylesheet("organisation") %>
 
 <%= render partial: 'meta', locals: { organisation: @organisation } %>
+
+<% @organisation.content_extensions&.each do |content_extension| %>
+  <%= render partial: "shared/content_extension_#{content_extension["document_type"]}", locals: { content_extension: } %>
+<% end %>
+
 <%= render partial: 'breadcrumb' %>
 <%= render partial: 'header' %>
 <% if @organisation.custom_banner %>

app/views/shared/_content_extension_hero_image.html.erb

@@ -0,0 +1,12 @@
+<style>
+.full-width {
+    width: 100vw;
+    position: relative;
+    left: 50%;
+    right: 50%;
+    margin-left: -50vw;
+    margin-right: -50vw;
+}
+</style>
+<h2 class="govuk-heading-m"><%= content_extension.dig("details", "text") %></h2>
+<%= image_tag content_extension.dig("details", "image"), class: 'full-width' %>

config/initializers/content_security_policy.rb

@@ -1 +1,2 @@
-GovukContentSecurityPolicy.configure
+# TODO - reenable this once we've removed the placeholder images
+# GovukContentSecurityPolicy.configure

data/content_extensions/705dbea4-8bd7-422e-ba9c-254557f77f81/001-hero-image.yaml

@@ -0,0 +1,11 @@
+# This is just an example of the sort of thing we might put in this directory
+# Once the designs have crystallized a little bit, we should be able to hardcode
+# some more compelling bits of content here.
+document_type: 'hero_image'
+schema_name: 'hero_image'
+locale: 'en'
+title: "Prime Minister's Office, 10 Downing Street"
+details:
+  image: 'rory.jpg'
+  image_alt: '' # Intentionally left blank, image is decorative
+  text: "So Government! Much Improvement! Wow!"

data/content_extensions/705dbea4-8bd7-422e-ba9c-254557f77f81/README.md

@@ -0,0 +1,9 @@
+# Content extensions for [/government/organisations/prime-ministers-office-10-downing-street](https://www.gov.uk/government/organisations/prime-ministers-office-10-downing-street)
+
+The YAML files in this directory will be merged into the content item retrieved from content store before the
+page is rendered.
+
+The content of each YAML file in alphabetical order will appear in `.links.content_extensions[]` in the content item.
+
+Because this is happening in the frontend application, there's no need to adhere to any particular schema for these
+files, but you must make sure that the structure of each file matches the structure the ruby code expects it to have.

data/content_extensions/README.md

@@ -0,0 +1,27 @@
+# Content Extensions
+
+These are hardcoded extensions to the content items returned from content-store.
+
+Hardcoding these allows us to experiment with the structure of the page and the components on the page, without having
+to continuously tweak the publishing system.
+
+Eventually, these extensions should either be provided by content-store itself, or removed.
+
+## Similar past approaches
+
+For previous pages with significant hardcoded content, we've used locale files. For example, see
+
+```
+git log -- config/locales/en/coronavirus_landing_page.yml
+```
+
+... for a history of the changes we made to the coronavirus landing page.
+
+This approach works fine, but it doesn't align as closely with the way the publishing system works.
+
+## Structure
+
+Each subdirectory name is the content_id of some page rendered by collections. Inside each directory
+is a list of numbered YAML files. Each YAML file will be added to the "links.content_extensions" field
+of the content item by collections when it loads the item. The files will appear in the same order as
+they do in the directory (so they can be reordered by changing their numbers).

data/theme_overrides/705dbea4-8bd7-422e-ba9c-254557f77f81/theme.yaml

@@ -0,0 +1 @@
+layout: "full_width"