Add Replay link; Resolves #19 (#35)

* Create an accessor that uses to Solr fields to query Time Travel API
* Display accessor as a field
* Create a test
* Update Rubocop to ignore somethings; TODO create tickets, and come back to this later

.rubocop.yml

@@ -17,6 +17,7 @@ Metrics/LineLength:
   Max: 120
   Exclude:
     - 'Gemfile'
+    - 'spec/models/concerns/warclight/solr_document_spec.rb'
 
 Metrics/ModuleLength:
   Max: 120
@@ -34,12 +35,17 @@ Metrics/BlockLength:
     - 'spec/**/*'
     - 'lib/warclight/custom_document.rb'
 
+Metrics/AbcSize:
+  Exclude:
+    - 'app/models/concerns/warclight/solr_document.rb' #Come back to this later
+
 Performance/RegexpMatch:
   Enabled: false
 
 Rails/OutputSafety:
   Exclude:
     - 'app/controllers/concerns/warclight/field_config_helpers.rb' # html_safe needs to be called to mimic BL JOIN behavior
+    - 'app/models/concerns/warclight/solr_document.rb'
 
 RSpec/ExampleLength:
   Enabled: false
@@ -50,6 +56,10 @@ RSpec/MultipleExpectations:
 RSpec/NestedGroups:
   Max: 4
 
+Rails/TimeZone:
+  Exclude:
+    - 'app/models/concerns/warclight/solr_document.rb' #Come back to this later
+
 Style/Documentation:
   Exclude:
     - 'spec/**/*'

app/models/concerns/warclight/solr_document.rb

@@ -5,5 +5,18 @@ module Warclight
   # Extends Blacklight::Solr::Document to provide Warclight specific behavior
   module SolrDocument
     extend Blacklight::Solr::Document
+
+    def replay_link
+      time_travel_base_url = 'http://timetravel.mementoweb.org/api/json/'
+      time_travel_time_format = '%Y%m%d%H%M%S'
+      time_travel_time = (Time.parse(first(:crawl_date)).strftime time_travel_time_format).to_s
+      time_travel_request_url = time_travel_base_url + time_travel_time + '/' + first(:url).to_s
+      time_travel_request = URI(time_travel_request_url)
+      time_travel_response = Net::HTTP.get(time_travel_request)
+      time_travel_response_json = JSON.parse(time_travel_response)
+      replay_url = time_travel_response_json['mementos']['closest']['uri'][0]
+      replay_url_link = '<a href="' + "#{replay_url}" '" target="_blank">'"#{replay_url}"'</a> 🔗'
+      replay_url_link.html_safe
+    end
   end
 end

lib/generators/warclight/templates/catalog_controller.rb

@@ -80,6 +80,7 @@ class CatalogController < ApplicationController
     # solr fields to be displayed in the show (single result) view
     #   The ordering of the field names is the order of the display
     config.add_show_field 'url', label: 'URL', helper_method: :url_to_link
+    config.add_show_field 'replay_url', label: 'Replay URL', accessor: :replay_link
     config.add_show_field 'resourcename', label: 'Resource Name', link_to_facet: true
     config.add_show_field 'host', label: 'Host', link_to_facet: true
     config.add_show_field 'institution', label: 'Institution', link_to_facet: true

spec/models/concerns/warclight/solr_document_spec.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Warclight::SolrDocument do
+  let(:document) { SolrDocument.new }
+
+  describe '#replay_link' do
+    let(:document) do
+      SolrDocument.new(crawl_date: '2015-01-13T16:36:01Z', url: 'http://www.library.yorku.ca/cms/steacie/about-the-library/hackfest/')
+    end
+
+    it 'writes a replay url based on memento time travel response' do
+      expect(document.replay_link).to eq '<a href="https://digital.library.yorku.ca/wayback/20150113163601/http://www.library.yorku.ca/cms/steacie/about-the-library/hackfest/" target="_blank">https://digital.library.yorku.ca/wayback/20150113163601/http://www.library.yorku.ca/cms/steacie/about-the-library/hackfest/</a> 🔗'
+    end
+  end
+end