Add recaptcha to articles page. (#4850)

Gemfile

@@ -101,3 +101,5 @@ group :production do
   gem "dalli"
   gem "connection_pool"
 end
+
+gem "recaptcha", "~> 5.18"

Gemfile.lock

@@ -521,6 +521,7 @@ GEM
     rake (13.2.1)
     rdoc (6.7.0)
       psych (>= 4.0.0)
+    recaptcha (5.18.0)
     regexp_parser (2.10.0)
     reline (0.5.10)
       io-console (~> 0.5)
@@ -761,6 +762,7 @@ DEPENDENCIES
   rack-mini-profiler
   rails (= 7.1.5.1)
   rails-controller-testing
+  recaptcha (~> 5.18)
   rsolr (~> 2.6)
   rspec-rails
   rubocop

app/components/blacklight/search_bar_component.html.erb

@@ -27,8 +27,13 @@
       <%= search_button || render(Blacklight::SearchButtonComponent.new(id: "#{@prefix}search", text: scoped_t('submit'))) %>
     </span>
   </div>
+
+  <% if @recaptcha_action %>
+    <%= recaptcha_v3(action: @recaptcha_action) %>
+  <% end %>
+
 <% end %>
 
 <% if advanced_search_enabled? %>
   <%= link_to t('blacklight.advanced_search.more_options'), @advanced_search_url, class: 'advanced_search btn btn-secondary'%>
-<% end %>
+<% end %>

app/components/blacklight/search_bar_component.rb

@@ -11,7 +11,7 @@ class SearchBarComponent < Blacklight::Component
 
     # rubocop:disable Metrics/ParameterLists
     def initialize(
-      url:, advanced_search_url: nil, params:,
+      url:, advanced_search_url: nil, params:, recaptcha_action:,
       classes: ["search-query-form, d-flex "], presenter: nil, prefix: nil,
       method: "GET", q: nil, query_param: :q,
       search_field: nil, search_fields: nil, autocomplete_path: nil,
@@ -32,6 +32,7 @@ def initialize(
       @search_fields = search_fields
       @i18n = i18n
       @form_options = form_options
+      @recaptcha_action = recaptcha_action
 
       return if presenter.nil?
 

app/controllers/primo_central_controller.rb

@@ -5,10 +5,30 @@ class PrimoCentralController < CatalogController
   include CatalogConfigReinit
   include Blacklight::Document::Export
 
+  before_action :recaptcha, only: [ :index ]
+
   helper_method :browse_creator
   helper_method :tags_strip
   helper_method :solr_range_queries_to_a
 
+  def recaptcha
+    # skip if recaptcha site key not set (using as feature flag)
+    return if ENV["RECAPTCHA_SITE_KEY"].blank?
+
+    @recaptcha_action = "articles_search"
+
+    # skip if referred from app.
+    return if request.referer.present? && URI.parse(request.referer).host == request.host
+
+    # skip if nothing to query.
+    return if params["q"].blank?
+
+    if !verify_recaptcha(action: @recaptcha_action)
+      head :forbidden
+    end
+  end
+
+
   def advanced_override_path
   end
 

app/views/catalog/_search_form.html.erb

@@ -1,6 +1,7 @@
 <%= render(Blacklight::SearchBarComponent.new(
       url: search_action_url,
       params: search_state.params_for_search.except(:qt),
+      recaptcha_action: @recaptcha_action,
       search_fields: Deprecation.silence(Blacklight::ConfigurationHelperBehavior) { search_fields },
       )) %>