Adding IIIF resource and ingest job

Gemfile

@@ -62,5 +62,6 @@ gem 'blacklight-gallery', '>= 0.3.0'
 gem 'blacklight-oembed'
 gem 'social-share-button'
 gem 'devise_invitable'
+gem 'faraday'
 gem 'rubocop', require: false
 gem 'rubocop-rspec', require: false

Gemfile.lock

@@ -435,6 +435,7 @@ DEPENDENCIES
   devise
   devise-guests (~> 0.3)
   devise_invitable
+  faraday
   friendly_id
   jbuilder (~> 2.0)
   jettywrapper (>= 2.0)

app/jobs/iiif_ingest_job.rb

@@ -0,0 +1,15 @@
+class IIIFIngestJob < ActiveJob::Base
+  # Ingest one or more IIIF manfiest URLs.  Each manifest is ingested as its
+  # own resource.
+  def perform(urls)
+    arr = urls.is_a?(Array) ? urls : Array(urls)
+    arr.each do |url|
+      ingest url
+    end
+  end
+
+  # Ingest a single IIIF manifest URL as a resource.
+  def ingest(url)
+    IIIFResource.new(manifest_url: url).save
+  end
+end

app/models/iiif_resource.rb

@@ -0,0 +1,43 @@
+class IIIFResource < Spotlight::Resource
+  # If a manifest_url if provided, it is retrieved, parsed and indexed
+  def initialize(manifest_url: nil)
+    super()
+    return if manifest_url.blank?
+    manifest = IIIFResource.parse_manifest(manifest_url)
+    @title = manifest['label']
+    self.url = manifest_url
+
+    self.data ||= {}
+    self.data['thumbnail'] = manifest['thumbnail']['@id'] if manifest['thumbnail']
+    manifest['metadata'].each do |h|
+      self.data[h['label'].parameterize('_')] = h['value'].map { |v| v["@value"] }
+    end
+  end
+
+  def title_field
+    :"#{solr_fields.prefix}spotlight_title#{solr_fields.string_suffix}"
+  end
+
+  def to_solr
+    solr_doc = super
+    solr_doc[title_field] = @title
+
+    data.each do |k, v|
+      solr_doc[(k + solr_fields.string_suffix).to_sym] = v
+    end
+
+    solr_doc
+  end
+
+  def solr_fields
+    Spotlight::Engine.config.solr_fields
+  end
+
+  # Retrieve a IIIF manifest and parse the resulting JSON
+  def self.parse_manifest(manifest_url)
+    conn = Faraday.new(manifest_url) do |builder|
+      builder.headers['Content-Type'] = 'application/json'
+    end
+    JSON.parse conn.get(manifest_url)
+  end
+end

spec/jobs/iiif_ingest_job_spec.rb

@@ -0,0 +1,22 @@
+require 'rails_helper'
+
+describe IIIFIngestJob do
+  let(:url1) { 'http://example.com/1/manifest' }
+  let(:url2) { 'http://example.com/2/manifest' }
+  let(:resource) { IIIFResource.new }
+
+  it 'ingests a single url' do
+    allow_any_instance_of(IIIFResource).to receive(:save)
+    expect(IIIFResource).to receive(:new).with(manifest_url: url1).and_return(resource)
+
+    described_class.new.perform(url1)
+  end
+
+  it 'ingests each of an array of urls' do
+    allow_any_instance_of(IIIFResource).to receive(:save)
+    expect(IIIFResource).to receive(:new).with(manifest_url: url1).and_return(resource)
+    expect(IIIFResource).to receive(:new).with(manifest_url: url2).and_return(resource)
+
+    described_class.new.perform([url1, url2])
+  end
+end

spec/models/iiif_resource_spec.rb

@@ -0,0 +1,61 @@
+require 'rails_helper'
+
+describe IIIFResource do
+  let(:url) { 'http://example.com/1/manifest' }
+  let(:json) { '{
+    "@context":"http://iiif.io/api/presentation/2/context.json",
+    "@id":"http://example.com/1/manifest",
+    "@type":"sc:Manifest",
+    "label":"Sample Manifest",
+    "thumbnail":{
+      "@id":"http://example.com/loris/1.jp2/full/100,/0/default.jpg",
+      "service":{
+        "@context":"http://iiif.io/api/image/2/context.json",
+        "@id":"https://example.com/loris/1.jp2",
+        "profile":"http://iiif.io/api/image/2/level2.json" }},
+    "metadata":[
+      { "label": "Creator", "value": [{ "@value": "Author, Alice, 1954-" }] },
+      { "label": "Date created", "value": [{ "@value": "1985" }] }
+    ]}'
+  }
+
+  before do
+    allow_any_instance_of(Faraday::Connection).to receive(:get).and_return(json)
+  end
+
+  describe '#initialize' do
+    it 'loads metadata from the IIIF manifest' do
+      resource = described_class.new(manifest_url: url)
+      expect(resource.url).to eq(url)
+      expect(resource.data['thumbnail']).to eq('http://example.com/loris/1.jp2/full/100,/0/default.jpg')
+      expect(resource.data['creator']).to eq(['Author, Alice, 1954-'])
+    end
+  end
+
+  describe '#parse_manifest' do
+    it 'retrieves and parses an IIIF manifest' do
+      expect_any_instance_of(Faraday::Connection).to receive(:get).with(url)
+      manifest = described_class.parse_manifest(url)
+      expect(manifest['@id']).to eq(url)
+      expect(manifest['label']).to eq('Sample Manifest')
+      expect(manifest['thumbnail']['@id']).to eq('http://example.com/loris/1.jp2/full/100,/0/default.jpg')
+    end
+  end
+
+  describe '#to_solr' do
+    subject { described_class.new(manifest_url: url) }
+    before do
+      exhibit = Spotlight::Exhibit.new
+      allow(exhibit).to receive(:blacklight_config).and_return(Blacklight::Configuration.new)
+      subject.exhibit = exhibit
+    end
+
+    it 'indexes iiif metadata' do
+      solr_doc = subject.to_solr
+      expect(solr_doc[:spotlight_title_ssim]).to eq('Sample Manifest')
+      expect(solr_doc[:thumbnail_ssim]).to eq('http://example.com/loris/1.jp2/full/100,/0/default.jpg')
+      expect(solr_doc[:creator_ssim]).to eq(['Author, Alice, 1954-'])
+      expect(solr_doc[:date_created_ssim]).to eq(['1985'])
+    end
+  end
+end