🎁 Only run thumbnail derivatives on thumbnails

Gemfile.lock

@@ -31,15 +31,14 @@ GIT
 
 GIT
   remote: https://github.com/scientist-softserv/iiif_print.git
-  revision: e42cfd2a6d9b0aac9901084625ee1e1a0a3ccb6d
+  revision: 5c5fa6880b3dc22beed738cfcba7af57b698ac36
   branch: main
   specs:
     iiif_print (1.0.0)
       blacklight_iiif_search (>= 1.0, < 3.0)
       derivative-rodeo (~> 0.5)
       hyrax (>= 2.5, < 6)
       nokogiri (>= 1.13.2)
-      rails (>= 5.0, < 8.0)
       rdf-vocab (~> 3.0)
 
 GIT

config/application.rb

@@ -96,6 +96,13 @@ class Application < Rails::Application
         Rails.configuration.cache_classes ? require(c) : load(c)
       end
 
+      # See: https://github.com/scientist-softserv/adventist-dl/issues/676
+      IiifPrint::DerivativeRodeoService.named_derivatives_and_generators_filter =
+        ->(file_set:, filename:, named_derivatives_and_generators:) do
+          named_derivatives_and_generators.reject do |named_derivative, generators|
+            named_derivative != :thumbnail && filename.downcase.ends_with?(Hyku::THUMBNAIL_FILE_SUFFIX)
+          end
+        end
     end
 
     # resolve reloading issue in dev mode
@@ -121,4 +128,6 @@ class Application < Rails::Application
     # copies tinymce assets directly into public/assets
     config.tinymce.install = :copy
   end
+
+  THUMBNAIL_FILE_SUFFIX = '.tn.jpg'
 end

config/initializers/iiif_print.rb

@@ -127,4 +127,6 @@
 if ENV.fetch('LOCAL_RODEO_LOG', 'false') == 'true'
   FileUtils.mkdir_p(Rails.root.join('log').to_s)
   DerivativeRodeo.config.logger = Logger.new(Rails.root.join("log/dr.log").to_s, level: Logger::DEBUG)
+else
+  DerivativeRodeo.config.logger = Rails.logger
 end

lib/iiif_manifest/manifest_builder/canvas_builder_factory_decorator.rb

@@ -5,12 +5,10 @@
 module IIIFManifest
   module ManifestBuilderDecorator
     module CanvasBuilderFactoryDecorator
-      THUMBNAIL_FILE_SUFFIX = '.tn.jpg'
-
       def from(work)
         composite_builder.new(
           *file_set_presenters(work).map do |presenter|
-            next if presenter.label.downcase.end_with?(THUMBNAIL_FILE_SUFFIX) || !presenter.image?
+            next if presenter.label.downcase.end_with?(Hyku::THUMBNAIL_FILE_SUFFIX) || !presenter.image?
             canvas_builder_factory.new(presenter, work)
           end
         )

spec/config/application_spec.rb

@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+# rubocop:disable RSpec/DescribeClass
+RSpec.describe 'config/application.rb' do
+  # rubocop:enable RSpec/DescribeClass
+  describe 'IiifPrint::DerivativeRodeoService.named_derivatives_and_generators_filter' do
+    subject do
+      IiifPrint::DerivativeRodeoService
+        .named_derivatives_and_generators_filter
+        .call(file_set: file_set,
+              filename: filename,
+              named_derivatives_and_generators: named_derivatives_and_generators).keys
+    end
+
+    let(:file_set) { double('file_set') }
+    let(:named_derivatives_and_generators) do
+      IiifPrint::DerivativeRodeoService.named_derivatives_and_generators_by_type.fetch(:image).deep_dup
+    end
+
+    context 'for a thumbnail file' do
+      let(:filename) { 'image.TN.jpg' }
+
+      it 'will only generate a thumbnail' do
+        expect(subject).to eq [:thumbnail]
+      end
+    end
+
+    context 'for a non-thumbnail file' do
+      let(:filename) { 'image.jpg' }
+
+      it 'will generate all derivatives' do
+        expect(subject).to eq %i[thumbnail json xml txt]
+      end
+    end
+  end
+end