add support for downloading the original file

app/controllers/bulkrax/importers_controller.rb

@@ -13,7 +13,7 @@ class ImportersController < ::Bulkrax::ApplicationController
     before_action :token_authenticate!, if: -> { api_request? }, only: [:create, :update, :delete]
     before_action :authenticate_user!, unless: -> { api_request? }
     before_action :check_permissions
-    before_action :set_importer, only: [:show, :entry_table, :edit, :update, :destroy]
+    before_action :set_importer, only: [:show, :entry_table, :edit, :update, :destroy, :original_file]
     with_themed_layout 'dashboard' if defined?(::Hyrax)
 
     # GET /importers
@@ -201,6 +201,14 @@ def external_sets
       end
     end
 
+    def original_file
+      if @importer.original_file?
+        send_file @importer.original_file
+      else
+        redirect_to @importer, alert: 'Importer does not support file re-download or the imported file is not found on the server.'
+      end
+    end
+
     # GET /importers/1/export_errors
     def export_errors
       @importer = Importer.find(params[:importer_id])

app/models/bulkrax/importer.rb

@@ -149,6 +149,14 @@ def seen
       @seen ||= {}
     end
 
+    def original_file?
+      File.exist?(self.parser_fields['import_file_path'])
+    end
+
+    def original_file
+      self.parser_fields['import_file_path'] if original_file?
+    end
+
     def replace_files
       self.parser_fields['replace_files']
     end

app/views/bulkrax/importers/show.html.erb

@@ -1,12 +1,12 @@
 <div class="col-xs-12 main-header">
   <h1><span class="fa fa-cloud-upload" aria-hidden="true"></span> Importer: <%= @importer.name %></h1>
-
-  <% if @importer.failed_entries? %>
-    <div class="pull-right">
+  <div class="pull-right">
+    <%= link_to 'Download Original File', importer_original_file_path(@importer.id), class: 'btn btn-primary', data: { turbolinks: false } if @importer.original_file %>
+    <% if @importer.failed_entries? %>
       <%= link_to 'Export Errored Entries', importer_export_errors_path(@importer.id), class: 'btn btn-primary', data: { turbolinks: false }%>
       <%= link_to 'Upload Corrected Entries', importer_upload_corrected_entries_path(@importer.id), class: 'btn btn-primary' if @importer.parser.is_a?(Bulkrax::CsvParser) %>
-    </div>
-  <% end %>
+    <% end %>
+  </div>
 </div>
 <div class="panel panel-default bulkrax-align-text">
   <div class="panel-body">

config/routes.rb

@@ -11,6 +11,7 @@
   end
   resources :importers do
     put :continue
+    get :original_file
     get :entry_table
     get :export_errors
     collection do