Add handling for missing derivatives to manifest generation

app/models/iiif_canvas_presenter.rb

@@ -36,6 +36,7 @@ def range
 
   # @return [IIIFManifest::V3::DisplayContent] the display content required by the manifest builder.
   def display_content
+    return if master_file.derivative_ids.empty?
     master_file.is_video? ? video_content : audio_content
   end
 
@@ -59,12 +60,20 @@ def see_also
   end
 
   def placeholder_content
-    # height and width from /models/master_file/extract_still method
-    IIIFManifest::V3::DisplayContent.new( @master_file.poster_master_file_url(@master_file.id),
-                                          width: 1280,
-                                          height: 720,
-                                          type: 'Image',
-                                          format: 'image/jpeg')
+    if @master_file.derivative_ids.size > 0
+      # height and width from /models/master_file/extract_still method
+      IIIFManifest::V3::DisplayContent.new( @master_file.poster_master_file_url(@master_file.id),
+                                            width: 1280,
+                                            height: 720,
+                                            type: 'Image',
+                                            format: 'image/jpeg')
+    else
+      support_email = Settings.email.support
+      IIIFManifest::V3::DisplayContent.new(nil,
+                                           label: I18n.t('errors.missing_derivatives_error') % [support_email, support_email],
+                                           type: 'Text',
+                                           format: 'text/plain')
+    end
   end
 
   private

app/models/iiif_manifest_presenter.rb

@@ -29,8 +29,7 @@ def initialize(media_object:, master_files:, lending_enabled: false)
   end
 
   def file_set_presenters
-    # Only return master files that have derivatives to avoid oddities in the manifest and failures in iiif_manifest
-    master_files.select { |mf| mf.derivative_ids.size > 0 }
+    master_files
   end
 
   def work_presenters

app/models/iiif_playlist_canvas_presenter.rb

@@ -72,12 +72,18 @@ def annotation_content
   def placeholder_content
     if cannot_read_item
       IIIFManifest::V3::DisplayContent.new(nil,
-                                           label: 'You do not have permission to playback this item.',
+                                           label: I18n.t('playlist.restrictedText'),
                                            type: 'Text',
                                            format: 'text/plain')
     elsif master_file.nil?
       IIIFManifest::V3::DisplayContent.new(nil,
-                                           label: 'The source for this playlist item has been deleted.',
+                                           label: I18n.t('playlist.deletedText'),
+                                           type: 'Text',
+                                           format: 'text/plain')
+    elsif master_file.derivative_ids.empty?
+      support_email = Settings.email.support
+      IIIFManifest::V3::DisplayContent.new(nil,
+                                           label: I18n.t('errors.missing_derivatives_error') % [support_email, support_email],
                                            type: 'Text',
                                            format: 'text/plain')
     end

app/models/iiif_playlist_manifest_presenter.rb

@@ -25,8 +25,7 @@ def initialize(playlist:, items:, can_edit_playlist: false)
   end
 
   def file_set_presenters
-    # Only return master files that have derivatives to avoid oddities in the manifest and failures in iiif_manifest
-    items.select { |item| item.master_file.derivative_ids.size.positive? }
+    items
   end
 
   def work_presenters

config/locales/en.yml

@@ -16,6 +16,9 @@ en:
       receiving this message, please contact us at <a href="mailto:%s">%s</a>.
     general_auth_error: You are not authorized to access this content.
     general_500_error: There was an error with this request.
+    missing_derivatives_error: |
+      This item is unable to be played because of missing streaming derivatives.
+      Please contact support to report this error: <a href="mailto:%s">%s</a>.
     controlled_vocabulary_error: |
       %s Please contact support to report this error: <a href="mailto:%s">%s</a>.
     messages:
@@ -233,6 +236,9 @@ en:
     tags:
       label: "Tags"
 
+    restrictedText: "You do not have permission to playback this item."
+    deletedText: "The source for this playlist item has been deleted."
+
   timeline:
     ago: "%{time} ago"
 

spec/models/iiif_canvas_presenter_spec.rb

@@ -100,17 +100,35 @@
   describe '#placeholder_content' do
     subject { presenter.placeholder_content }
 
-    it 'has format' do
-      expect(subject.format).to eq "image/jpeg"
-    end
+    context 'when master file has derivatives' do
+      it 'has format' do
+        expect(subject.format).to eq "image/jpeg"
+      end
 
-    it 'has type' do
-      expect(subject.type).to eq "Image"
+      it 'has type' do
+        expect(subject.type).to eq "Image"
+      end
+
+      it 'has height and width' do
+        expect(subject.width).to eq 1280
+        expect(subject.height).to eq 720
+      end
     end
 
-    it 'has height and width' do
-      expect(subject.width).to eq 1280
-      expect(subject.height).to eq 720
+    context 'when master file does not have derivatives' do
+      let(:master_file) { FactoryBot.build(:master_file, media_object: media_object) }
+
+      it 'has format' do
+        expect(subject.format).to eq "text/plain"
+      end
+
+      it 'has type' do
+        expect(subject.type).to eq "Text"
+      end
+
+      it 'has label' do
+        expect(subject.label).to eq I18n.t('errors.missing_derivatives_error') % [Settings.email.support, Settings.email.support]
+      end
     end
   end
 

spec/models/iiif_playlist_canvas_presenter_spec.rb

@@ -188,7 +188,7 @@
         expect(subject).to be_present
         expect(subject.format).to eq "text/plain"
         expect(subject.type).to eq "Text"
-        expect(subject.label).to eq "You do not have permission to playback this item."
+        expect(subject.label).to eq I18n.t('playlist.restrictedText')
       end
     end
 
@@ -200,7 +200,18 @@
         expect(subject).to be_present
         expect(subject.format).to eq "text/plain"
         expect(subject.type).to eq "Text"
-        expect(subject.label).to eq "The source for this playlist item has been deleted."
+        expect(subject.label).to eq I18n.t('playlist.deletedText')
+      end
+    end
+
+    context 'when an item has no derivatives' do
+      let(:master_file) { FactoryBot.build(:master_file, media_object: media_object) }
+
+      it 'generates placeholder canvas' do
+        expect(subject).to be_present
+        expect(subject.format).to eq "text/plain"
+        expect(subject.type).to eq "Text"
+        expect(subject.label).to eq I18n.t('errors.missing_derivatives_error') % [Settings.email.support, Settings.email.support]
       end
     end
   end