[i335] - port over serverless code from nnp

app/indexers/concerns/iiif_print/file_set_indexer.rb

@@ -23,7 +23,15 @@ def generate_solr_document
         text = text.tr("\n", ' ').squeeze(' ')
         solr_doc['all_text_timv'] = text
         solr_doc['all_text_tsimv'] = text
+        solr_doc['digest_ssim'] = digest_from_content
       end
+    end
+
+        private
+
+    def digest_from_content
+      return unless object.original_file
+      object.original_file.digest.first.to_s
     end
   end
 end

app/models/concerns/iiif_print/solr/document.rb

@@ -19,6 +19,7 @@ module IiifPrint::Solr::Document
   def self.decorate(base)
     base.prepend(self)
     base.send(:attribute, :is_child, Hyrax::SolrDocument::Metadata::Solr::String, 'is_child_bsi')
+    base.send(:attribute, :digest, Hyrax::SolrDocument::Metadata::Solr::String, 'digest_ssim')
 
     # @note These properties came from the newspaper_works gem.  They are configurable.
     base.class_attribute :iiif_print_solr_field_names, default: %w[alternative_title genre
@@ -31,6 +32,10 @@ def self.decorate(base)
     base
   end
 
+  def digest_sha1
+    digest[/urn:sha1:([\w]+)/, 1]
+  end
+
   def method_missing(method_name, *args, &block)
     super unless iiif_print_solr_field_names.include? method_name.to_s
     self[::ActiveFedora.index_field_mapper.solr_name(method_name.to_s)]

app/presenters/iiif_print/iiif_manifest_presenter_behavior.rb

@@ -25,5 +25,74 @@ def sequence_rendering
           'label' => I18n.t("hyrax.manifest.download_text") + (rendering.label || '') }
       end.flatten
     end
+
+    module DisplayImagePresenterBehavior
+      def display_image
+        return nil unless latest_file_id
+
+        IIIFManifest::DisplayImage
+          .new(display_image_url(hostname),
+              format: image_format(alpha_channels),
+              width: width,
+              height: height,
+              iiif_endpoint: iiif_endpoint(latest_file_id, base_url: hostname))
+      end
+
+      def display_image_url(base_url)
+        if ENV['SERVERLESS_IIIF_URL'].present?
+          # At the moment we are only concerned about Hyrax's default image url builder
+          iiif_image_url_builder(url_builder: Hyrax.config.iiif_image_url_builder)
+        else
+          super
+        end
+      end
+
+      def iiif_endpoint(file_id, base_url: request.base_url)
+        if ENV['SERVERLESS_IIIF_URL'].present?
+          IIIFManifest::IIIFEndpoint.new(
+            File.join(ENV['SERVERLESS_IIIF_URL'], file_id),
+            profile: Hyrax.config.iiif_image_compliance_level_uri
+          )
+        else
+          super
+        end
+      end
+
+      def hostname
+        @hostname || 'localhost'
+      end
+
+      ##
+      # @return [Boolean] false
+      def work?
+        false
+      end
+
+      private
+
+      def latest_file_id
+        if ENV['SERVERLESS_IIIF_URL'].present?
+          serverless_latest_file_id
+        else
+          super
+        end
+      end
+
+      def serverless_latest_file_id
+        @latest_file_id ||= digest_sha1
+      end
+
+      def iiif_image_url_builder(url_builder:)
+        args = [
+          latest_file_id,
+          ENV['SERVERLESS_IIIF_URL'],
+          Hyrax.config.iiif_image_size_default
+        ]
+        # In Hyrax 3, Hyrax.config.iiif_image_url_builder takes an additional argument
+        args << image_format(alpha_channels) if url_builder.arity == 4
+
+        url_builder.call(*args).gsub(%r{images/}, '')
+      end
+    end
   end
 end

lib/iiif_print/engine.rb

@@ -71,6 +71,8 @@ def ability
 
     config.after_initialize do
       IiifPrint::Solr::Document.decorate(SolrDocument)
+      Hyrax::IiifManifestPresenter::DisplayImagePresenter
+        .prepend(IiifPrint::IiifManifestPresenterBehavior::DisplayImagePresenterBehavior)
     end
     # rubocop:enable Metrics/BlockLength
   end

spec/presenters/iiif_print/iiif_manifest_presenter_behavior_spec.rb

@@ -16,4 +16,33 @@
       expect(presenter.search_service).to include("#{solr_document.id}/iiif_search")
     end
   end
+
+  # this method is inside of the DisplayImagePresenterBehavior module
+  describe '#display_image' do
+    let(:presenter) { Hyrax::IiifManifestPresenter::DisplayImagePresenter.new(solr_document) }
+    let(:id) { 'abc123' }
+
+    context 'when serverless_iiif is enabled' do
+      let(:url) { 'serverless_iiif_url' }
+
+      it 'renders a serverless url' do
+        allow(ENV).to receive(:[])
+        allow(ENV).to receive(:[]).with('SERVERLESS_IIIF_URL').and_return(url)
+        allow(presenter).to receive(:latest_file_id).and_return(id)
+        expect(presenter.display_image.iiif_endpoint.url).to eq "#{url}/#{id}"
+        expect(presenter.display_image.iiif_endpoint.profile).to eq "http://iiif.io/api/image/2/level2.json"
+      end
+    end
+
+    context 'when serverless_iiif is not enabled' do
+      let(:iiif_info_url_builder) { ->(file_id, base_url) { "#{base_url}/#{file_id}" } }
+
+      it 'does not render a serverless url' do
+        allow(presenter).to receive(:latest_file_id).and_return(id)
+        allow(Hyrax.config).to receive(:iiif_image_server?).and_return(true)
+        allow(Hyrax.config).to receive(:iiif_info_url_builder).and_return(iiif_info_url_builder)
+        expect(presenter.display_image.iiif_endpoint.url).to eq "localhost/#{id}"
+      end
+    end
+  end
 end