adds generated JPG download functionality

whenever IIIF endpoint present in references; bypasses download
controller to avoid caching

app/helpers/geoblacklight_helper.rb

@@ -15,6 +15,10 @@ def document_downloadable?
     document_available? && @document.downloadable?
   end
 
+  def iiif_jpg_url
+    @document.references.iiif.endpoint.sub! 'info.json', 'full/full/0/default.jpg'
+  end
+
   def snippit(text)
     if text
       if text.length > 150

app/models/concerns/geoblacklight/solr_document.rb

@@ -24,7 +24,7 @@ def restricted?
     end
 
     def downloadable?
-      (direct_download || download_types.present?) && available?
+      (direct_download || download_types.present? || iiif_download) && available?
     end
 
     def references
@@ -43,6 +43,10 @@ def same_institution?
       fetch(:dct_provenance_s).downcase == Settings.INSTITUTION.downcase
     end
 
+    def iiif_download
+      return references.iiif.to_hash unless references.iiif.blank?
+    end
+
     def item_viewer
       ItemViewer.new(references)
     end

app/views/catalog/_downloads.html.erb

@@ -8,6 +8,8 @@
       <%= link_to(download_text(document.download_types.first[0]),
       download_hgl_path(id: document), data: {ajax_modal: 'trigger', download: 'trigger', download_type: 'harvard-hgl', download_id: document[:layer_slug_s] },
       class: 'btn btn-default') %>
+      <% elsif document.iiif_download.present? %>
+          <%= link_to "Download JPG", iiif_jpg_url, class: 'btn btn-default', download: 'trigger' %>
       <% else %>
       <%= link_to(download_text(document.download_types.first[0]), '', data: { download_path: "#{download_path(document[:layer_slug_s], type: document.download_types.first[0])}", download: 'trigger', download_type: document.download_types.first[0], download_id: document[:layer_slug_s] }, class: 'btn btn-default') %>
       <% end %>
@@ -29,8 +31,16 @@
           <%= link_to(download_text(@document[:dc_format_s]), document.direct_download[:download], 'contentUrl' => document.direct_download[:download], data: { download: 'trigger', download_type: 'direct', download_id: document[:layer_slug_s] }) %>
         </li>
         <% end %>
-        <% if document.download_types.present? %>
+        <% if document.download_types.present? || document.iiif_download.present? %>
         <li role="presentation" class="dropdown-header">Generated</li>
+        <% end %>
+        <% if document.iiif_download.present? %>
+        <li>
+          <%= link_to "Download JPG", iiif_jpg_url, download: 'trigger' %>
+        </li>
+        <% end %>
+
+        <% if document.download_types.present? %>
         <% document.download_types.each do |type| %>
         <%= content_tag(:li) do %>
         <% link_to(download_text(type[0]), '', data: { download_path: "#{download_path(document[:layer_slug_s], type: type[0])}", download: 'trigger', download_type: type[0], download_id: document[:layer_slug_s] }) %>

config/locales/geoblacklight.en.yml

@@ -22,6 +22,7 @@ en:
     references:
       wms: 'Web Mapping Service (WMS)'
       wfs: 'Web Feature Service (WFS)'
+      iiif: 'International Image Interoperability Framework (IIIF)'
       iso19139: 'ISO 19139'
       mods: 'MODS'
       fgdc: 'FGDC'

lib/generators/geoblacklight/templates/settings.yml

@@ -29,6 +29,7 @@ TIMEOUT_WMS: 4
 WEBSERVICES_SHOWN:
   - 'wms'
   - 'wfs'
+  - 'iiif'
   - 'feature_layer'
   - 'tiled_map_layer'
   - 'dynamic_map_layer'

spec/features/download_layer_spec.rb

@@ -21,6 +21,14 @@
     find('a', text: 'Download KMZ').click
     expect(page).to have_css('a', text: 'Your file mit-us-ma-e25zcta5dct-2000-kmz.kmz is ready for download')
   end
+  scenario 'jpg download option should be present under toggle' do
+    visit catalog_path('princeton-02870w62c')
+    expect(page).to have_css('li a', text: 'Download JPG')
+  end
+  scenario 'clicking jpg download button should redirect to external image' do
+    visit catalog_path('princeton-02870w62c')
+    expect(page).to have_css("a.btn.btn-default[href='http://libimages.princeton.edu/loris2/pudl0076%2Fmap_pownall%2F00000001.jp2/full/full/0/default.jpg']", text: 'Download JPG')
+  end
   scenario 'options should be available under toggle' do
     visit catalog_path('mit-us-ma-e25zcta5dct-2000')
     find('button.download-dropdown-toggle').click

spec/helpers/geoblacklight_helpers_spec.rb

@@ -44,6 +44,23 @@
       expect(geoblacklight_basemap).to eq 'positron'
     end
   end
+
+  describe '#iiif_jpg_url' do
+    let(:document) { SolrDocument.new(document_attributes) }
+    let(:document_attributes) do
+      {
+        dct_references_s: {
+          'http://iiif.io/api/image' => 'https://example.edu/image/info.json'
+        }.to_json
+      }
+    end
+
+    it 'returns JPG download URL when given URL to a IIIF info.json' do
+      assign(:document, document)
+      expect(helper.iiif_jpg_url).to eq 'https://example.edu/image/full/full/0/default.jpg'
+    end
+  end
+
   describe '#render_web_services' do
     let(:reference) { double(type: 'wms') }
     it 'with a reference to a defined partial' do

spec/models/concerns/geoblacklight/solr_document_spec.rb

@@ -121,6 +121,26 @@
       end
     end
   end
+  describe 'iiif_download' do
+    describe 'with a IIIF download' do
+      let(:document_attributes) do
+        {
+          dct_references_s: {
+            'http://iiif.io/api/image' => 'https://example.edu/images/info.json'
+          }.to_json
+        }
+      end
+      it 'returns a IIIF download hash' do
+        expect(document.iiif_download[:iiif]).to eq('https://example.edu/images/info.json')
+      end
+    end
+    describe 'without a IIIF download' do
+      let(:document_attributes) { {} }
+      it 'returns nil' do
+        expect(document.iiif_download).to be_nil
+      end
+    end
+  end
   describe 'item_viewer' do
     let(:document_attributes) { {} }
     it 'is a ItemViewer' do