Add asset save/loading

Gemfile

@@ -18,6 +18,7 @@ gem 'faker'
 gem 'faraday'
 gem 'flipper', '~> 1.3'
 gem 'flipper-active_record', '~> 1.3'
+gem 'flipper-ui', '~> 1.4'
 gem 'github_webhook', '~> 1.4'
 gem 'globalid'
 gem 'good_job', '~> 4.3'
@@ -37,6 +38,7 @@ gem 'paper_trail'
 gem 'pg', '~> 1.6'
 gem 'postmark-rails'
 gem 'puma', '~> 7.2'
+gem 'rack_content_type_default', '~> 1.1'
 gem 'rack-cors'
 gem 'rails', '~> 7.1'
 gem 'sentry-rails'
@@ -79,5 +81,3 @@ group :test do
   gem 'webdrivers'
   gem 'webmock'
 end
-
-gem 'flipper-ui', '~> 1.4'

Gemfile.lock

@@ -377,6 +377,8 @@ GEM
       rack (>= 3.0.0)
     rack-test (2.2.0)
       rack (>= 1.3)
+    rack_content_type_default (1.1.0)
+      rack
     rackup (2.3.1)
       rack (>= 3)
     rails (7.2.3)
@@ -632,6 +634,7 @@ DEPENDENCIES
   pry-byebug
   puma (~> 7.2)
   rack-cors
+  rack_content_type_default (~> 1.1)
   rails (~> 7.1)
   rails-erd
   rspec

app/controllers/api/scratch/assets_controller.rb

@@ -7,10 +7,20 @@ class AssetsController < ScratchController
       skip_before_action :check_scratch_feature, only: [:show]
 
       def show
-        render :show, formats: [:svg]
+        filename_with_extension = "#{params[:id]}.#{params[:format]}"
+        redirect_to rails_storage_redirect_url(ScratchAsset.find_by!(filename: filename_with_extension).file)
       end
 
       def create
+        begin
+          filename_with_extension = "#{params[:id]}.#{params[:format]}"
+          ScratchAsset.find_or_create_by!(filename: filename_with_extension) do |a|
+            a.file.attach(io: request.body, filename: filename_with_extension)
+          end
+        rescue ActiveRecord::RecordNotUnique => e
+          logger.error(e)
+        end
+
         render json: { status: 'ok', 'content-name': params[:id] }, status: :created
       end
     end

app/models/scratch_asset.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class ScratchAsset < ApplicationRecord
+  validates :filename, presence: true, uniqueness: true
+
+  has_one_attached :file
+end

config/application.rb

@@ -59,6 +59,13 @@ class Application < Rails::Application
     config.api_only = false
 
     config.middleware.insert_before 0, CorpMiddleware
+
+    require 'rack/content_type_default'
+    config.middleware.insert_before(
+      Rack::Runtime,
+      Rack::ContentTypeDefault, :post, 'application/octet-stream', '/api/scratch/assets/.*'
+    )
+
     config.generators.system_tests = nil
 
     config.active_record.encryption.primary_key = ENV.fetch('ACTIVE_RECORD_ENCRYPTION_PRIMARY_KEY')

config/routes.rb

@@ -35,8 +35,8 @@
   namespace :api do
     namespace :scratch do
       resources :projects, only: %i[show update create]
-      get '/assets/internalapi/asset/:id(.:format)/get/' => 'assets#show'
-      post '/assets/:id' => 'assets#create'
+      get '/assets/internalapi/asset/:id.:format/get/' => 'assets#show'
+      post '/assets/:id.:format' => 'assets#create'
     end
 
     resource :default_project, only: %i[show] do

db/migrate/20260310161646_create_scratch_assets.rb

@@ -0,0 +1,10 @@
+class CreateScratchAssets < ActiveRecord::Migration[7.2]
+  def change
+    create_table :scratch_assets, id: :uuid do |t|
+      t.string :filename, null: false
+      t.index :filename, unique: true
+
+      t.timestamps
+    end
+  end
+end

spec/factories/scratch_assets.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :scratch_asset do
+    sequence(:filename) { Random.hex }
+
+    trait :with_file do
+      transient { asset_path { file_fixture('test_image_1.png') } }
+
+      after(:build) do |asset, evaluator|
+        io = Rails.root.join(evaluator.asset_path).open
+        filename = File.basename(evaluator.asset_path)
+        content_type = Mime::Type.lookup_by_extension(filename)
+        asset.file.attach(io:, filename:, content_type:)
+      end
+    end
+  end
+end

spec/features/scratch/creating_and_showing_a_scratch_asset_spec.rb

@@ -0,0 +1,153 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe 'Creating a Scratch asset', type: :request do
+  let(:basename) { 'test_image_1' }
+  let(:format) { 'png' }
+  let(:filename) { "#{basename}.#{format}" }
+  let(:school) { create(:school) }
+  let(:teacher) { create(:teacher, school:) }
+  let(:cookie_headers) { { 'Cookie' => "scratch_auth=#{UserProfileMock::TOKEN}" } }
+
+  describe 'GET #show' do
+    let(:make_request) { get '/api/scratch/assets/internalapi/asset/test_image_1.png/get/' }
+
+    context 'when the asset exists' do
+      let!(:scratch_asset) { create(:scratch_asset, :with_file, filename:, asset_path: file_fixture(filename)) }
+
+      it 'redirects to the asset file URL' do
+        make_request
+
+        expect(response).to redirect_to(rails_storage_redirect_url(scratch_asset.file, only_path: true))
+      end
+    end
+  end
+
+  describe 'POST #create' do
+    let(:upload) { File.binread(file_fixture(filename)) }
+    let(:make_request) do
+      post '/api/scratch/assets/test_image_1.png', headers: { 'Content-Type' => 'application/octet-stream' }.merge(cookie_headers), params: upload
+    end
+
+    context 'when user is logged in and cat_mode is enabled' do
+      before do
+        authenticated_in_hydra_as(teacher)
+        Flipper.disable :cat_mode
+        Flipper.disable_actor :cat_mode, school
+      end
+
+      it 'creates a new asset' do
+        # Arrange
+        Flipper.enable_actor :cat_mode, school
+
+        # Act & Assert
+        expect { make_request }.to change(ScratchAsset, :count).by(1)
+      end
+
+      it 'sets the filename on the asset' do
+        # Arrange
+        Flipper.enable_actor :cat_mode, school
+
+        # Act & Assert
+        make_request
+        expect(ScratchAsset.last.filename).to eq(filename)
+      end
+
+      it 'attaches the uploaded file to the asset' do
+        # Arrange
+        Flipper.enable_actor :cat_mode, school
+
+        # Act & Assert
+        make_request
+        expect(ScratchAsset.last.file).to be_attached
+      end
+
+      it 'stores the content of the file in the attachment' do
+        # Arrange
+        Flipper.enable_actor :cat_mode, school
+
+        # Act & Assert
+        make_request
+        expect(ScratchAsset.last.file.download).to eq(upload)
+      end
+
+      it 'responds with 201 Created' do
+        # Arrange
+        Flipper.enable_actor :cat_mode, school
+
+        # Act & Assert
+        make_request
+        expect(response).to have_http_status(:created)
+      end
+
+      it 'includes the status and filename (without extension) in the response' do
+        # Arrange
+        Flipper.enable_actor :cat_mode, school
+
+        # Act & Assert
+        make_request
+        expect(response.parsed_body).to include(
+          'status' => 'ok',
+          'content-name' => basename
+        )
+      end
+
+      context 'when the asset already exists' do
+        let(:another_upload_path) { file_fixture('test_image_2.jpeg') }
+        let(:upload) { File.binread(another_upload_path) }
+        let(:original_upload) { File.binread(file_fixture(filename)) }
+
+        before do
+          create(:scratch_asset, :with_file, filename:, asset_path: file_fixture(filename))
+        end
+
+        it 'does not update the content of the file in the attachment' do
+          # Arrange
+          Flipper.enable_actor :cat_mode, school
+
+          # Act & Assert
+          make_request
+          expect(ScratchAsset.last.file.download).to eq(original_upload)
+        end
+
+        it 'responds with 201 Created' do
+          # Arrange
+          Flipper.enable_actor :cat_mode, school
+
+          # Act & Assert
+          make_request
+          expect(response).to have_http_status(:created)
+        end
+
+        it 'includes the status and filename (without extension) in the response' do
+          # Arrange
+          Flipper.enable_actor :cat_mode, school
+
+          # Act & Assert
+          make_request
+          expect(response.parsed_body).to include(
+            'status' => 'ok',
+            'content-name' => basename
+          )
+        end
+      end
+    end
+
+    context 'when user is logged in and cat_mode is disabled' do
+      before do
+        authenticated_in_hydra_as(teacher)
+        Flipper.disable :cat_mode
+        Flipper.disable_actor :cat_mode, school
+      end
+
+      it 'responds 404 Not Found when cat_mode is not enabled' do
+        # Act
+        post '/api/scratch/assets/example.svg', headers: cookie_headers
+
+        # Assert
+        expect(response).to have_http_status(:not_found)
+      end
+    end
+  end
+end