Use `Gitlab::StringPath` in CI build artifacts controller

app/controllers/projects/artifacts_controller.rb

@@ -15,7 +15,10 @@ class Projects::ArtifactsController < Projects::ApplicationController
   end
 
   def browse
-    @metadata = build.artifacts_metadata
+    path = params[:path].to_s
+    @paths = artifacts_metadata.map do |_artifact_file|
+      Gitlab::StringPath.new(path, artifacts_metadata)
+    end
   end
 
   private
@@ -28,6 +31,10 @@ class Projects::ArtifactsController < Projects::ApplicationController
     @artifacts_file ||= build.artifacts_file
   end
 
+  def artifacts_metadata
+    @artifacts_metadata ||= build.artifacts_metadata
+  end
+
   def authorize_download_build_artifacts!
     unless can?(current_user, :download_build_artifacts, @project)
       if current_user.nil?

lib/gitlab/string_path.rb

@@ -34,6 +34,18 @@ module Gitlab
       !directory?
     end
 
+    def has_parent?
+      raise NotImplementedError
+    end
+
+    def parent
+      raise NotImplementedError
+    end
+
+    def directories
+      raise NotImplementedError
+    end
+
     def files
       raise NotImplementedError
     end