1 files changed, 40 insertions, 0 deletions
diff --git a/app/services/export_csv/map_export_fields_service.rb b/app/services/export_csv/map_export_fields_service.rb
new file mode 100644
index 00000000000..d4f46c65328
--- /dev/null
+++ b/app/services/export_csv/map_export_fields_service.rb
@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+module ExportCsv
+  class MapExportFieldsService < BaseService
+    attr_reader :fields, :data
+
+    def initialize(fields, data)
+      @fields = fields
+      @data = data
+    end
+
+    def execute
+      return data if fields.empty?
+
+      selected_fields_to_hash
+    end
+
+    def invalid_fields
+      fields.reject { |field| permitted_field?(field) }
+    end
+
+    private
+
+    def selected_fields_to_hash
+      data.select { |key| requested_field?(key) }
+    end
+
+    def requested_field?(field)
+      field.downcase.in?(fields.map(&:downcase))
+    end
+
+    def permitted_field?(field)
+      field.downcase.in?(keys.map(&:downcase))
+    end
+
+    def keys
+      data.keys
+    end
+  end
+end