Implement report template loader [SCI-10999]

config/initializers/report_template_loader.rb

@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+require 'httparty'
+require 'active_storage/service/s3_service'
+
+template_zip_url_string = ENV.fetch('REPORT_TEMPLATES_ZIP_URL', nil)
+
+return unless template_zip_url_string
+
+template_zip_url = URI.parse(template_zip_url_string)
+contents = case template_zip_url.scheme
+           when 'https'
+             HTTParty.get(template_zip_url).body
+           when 's3'
+             ActiveStorage::Service::S3Service.new(
+               bucket: template_zip_url.host
+             ).download(template_zip_url.path[1..])
+           end
+
+root_folder = nil
+Zip::File.open_buffer(StringIO.new(contents)) do |zip|
+  zip.each do |entry|
+    # set root zip folder
+    root_folder = entry.name and next if entry.name.count('/') == 1
+
+    # create path while omitting root zip folder
+    path = Rails.root.join('app', 'views', 'reports', entry.name.sub(root_folder, ''))
+    path.dirname.mkpath
+
+    # don't try and write file if entry is a folder
+    next if entry.name.ends_with?('/')
+
+    path.open('wb') do |f|
+      f.write(entry.get_input_stream.read)
+    end
+  end
+end