From b9233cb2da1a67c4b19ad34aa06f823c0bc4ec5a Mon Sep 17 00:00:00 2001
From: syed-ali-tw <syed.ali1@digital.cabinet-office.gov.uk>
Date: Fri, 18 Oct 2024 17:05:49 +0100
Subject: [PATCH] Add route for browser extension to get routed to publisher

As Mainstream publisher moves to new design sytem,
we would need to make changes to the current external
link that navigates to filter publication page, we did discuss
different [options](https://docs.google.com/document/d/1DPl6MuUPDMLqRHjvbt3ByJyGVQT_F8on0Ek_-udcgjE/edit?tab=t.0)
we had to make this work.

This PR is coupled with the changes in [browser extension](https://github.com/alphagov/govuk-browser-extension/pull/212)
---
 app/controllers/content_item_controller.rb    | 21 +++++++++++++
 config/routes.rb                              |  2 ++
 .../content_item_controller_test.rb           | 30 +++++++++++++++++++
 3 files changed, 53 insertions(+)
 create mode 100644 app/controllers/content_item_controller.rb
 create mode 100644 test/functional/content_item_controller_test.rb

diff --git a/app/controllers/content_item_controller.rb b/app/controllers/content_item_controller.rb
new file mode 100644
index 000000000..e738758d5
--- /dev/null
+++ b/app/controllers/content_item_controller.rb
@@ -0,0 +1,21 @@
+class ContentItemController < ApplicationController
+  def by_content_id
+    artefact =
+      Artefact.find_by(content_id: params[:content_id])
+
+    if artefact
+      redirect_to edition_path(artefact.latest_edition)
+    else
+      redirect_to_root_path_with_error
+    end
+  rescue StandardError
+    redirect_to_root_path_with_error
+  end
+
+private
+
+  def redirect_to_root_path_with_error
+    flash[:danger] = "The requested content was not found"
+    redirect_to root_path
+  end
+end
diff --git a/config/routes.rb b/config/routes.rb
index 4b7e8ca9f..04545563b 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -103,6 +103,8 @@
   delete "/homepage/popular-links/:id" => "homepage#destroy", as: "delete_popular_links"
   get "homepage/popular-links/:id/confirm-destroy" => "homepage#confirm_destroy", as: "confirm_destroy_popular_links"
 
+  get "by-content-id/:content_id" => "content_item#by_content_id"
+
   mount GovukAdminTemplate::Engine, at: "/style-guide"
   mount Flipflop::Engine => "/flipflop"
   mount GovukPublishingComponents::Engine, at: "/component-guide"
diff --git a/test/functional/content_item_controller_test.rb b/test/functional/content_item_controller_test.rb
new file mode 100644
index 000000000..6d9e781c3
--- /dev/null
+++ b/test/functional/content_item_controller_test.rb
@@ -0,0 +1,30 @@
+require "test_helper"
+
+class ContentItemControllerTest < ActionController::TestCase
+  def setup
+    login_as_stub_user
+    @edition = FactoryBot.create(:edition)
+  end
+
+  should "redirect to content by content_id" do
+    get :by_content_id, params: { content_id: @edition.content_id }
+
+    assert_redirected_to edition_path(@edition.artefact.latest_edition)
+  end
+
+  should "redirect to root with error message if content_id is not found" do
+    get :by_content_id, params: { content_id: "#{@edition.artefact.content_id}wrong-id" }
+
+    assert_redirected_to root_path
+    assert_equal "The requested content was not found", flash[:danger]
+  end
+
+  should "redirect to root with error message if any error" do
+    Artefact.any_instance.stubs(:find_by).raises(StandardError)
+
+    get :by_content_id, params: { content_id: "#{@edition.artefact.content_id}wrong-id" }
+
+    assert_equal "The requested content was not found", flash[:danger]
+    assert_redirected_to root_path
+  end
+end