Use switch case in a helper, feedback:

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5142#note_13988401

app/controllers/projects/artifacts_controller.rb

@@ -35,14 +35,10 @@ class Projects::ArtifactsController < Projects::ApplicationController
   end
 
   def latest_succeeded
-    path = params[:path]
+    target_url = artifacts_action_url(params[:path], project, build)
 
-    if %w[download browse file].include?(path)
-      redirect_to send(
-        "#{path}_namespace_project_build_artifacts_url",
-        project.namespace,
-        project,
-        build)
+    if target_url
+      redirect_to(target_url)
     else
       render_404
     end

app/helpers/gitlab_routing_helper.rb

@@ -149,4 +149,19 @@ module GitlabRoutingHelper
   def resend_invite_group_member_path(group_member, *args)
     resend_invite_group_group_member_path(group_member.source, group_member)
   end
+
+  # Artifacts
+
+  def artifacts_action_url(path, project, build)
+    args = [project.namespace, project, build]
+
+    case path
+    when 'download'
+      download_namespace_project_build_artifacts_url(*args)
+    when 'browse'
+      browse_namespace_project_build_artifacts_url(*args)
+    when 'file'
+      file_namespace_project_build_artifacts_url(*args)
+    end
+  end
 end