Parse artifacts metadata stored in JSON format

app/controllers/projects/artifacts_controller.rb

@@ -18,8 +18,8 @@ class Projects::ArtifactsController < Projects::ApplicationController
     return render_404 unless build.artifacts?
 
     current_path = params[:path] ? "./#{params[:path]}/" : './'
-    metadata = build.artifacts_metadata_for_path(current_path)
-    @path = Gitlab::StringPath.new(current_path, metadata)
+    paths, metadata = build.artifacts_metadata_for_path(current_path)
+    @path = Gitlab::StringPath.new(current_path, paths, metadata)
   end
 
   private

app/models/ci/build.rb

@@ -350,8 +350,8 @@ module Ci
     end
 
     def artifacts_metadata_for_path(path)
-      return {} unless artifacts_metadata.exists?
-      metadata = []
+      return [] unless artifacts_metadata.exists?
+      paths, metadata = [], []
       meta_path = path.sub(/^\.\//, '')
 
       File.open(artifacts_metadata.path) do |file|
@@ -359,13 +359,14 @@ module Ci
         gzip.each_line do |line|
           if line =~ %r{^#{meta_path}[^/]+/?\s}
             path, meta =  line.split(' ')
-            metadata << path
+            paths << path
+            metadata << JSON.parse(meta)
           end
         end
         gzip.close
       end
 
-      metadata
+      [paths, metadata]
     end
 
     private

lib/gitlab/string_path.rb

@@ -10,10 +10,11 @@ module Gitlab
   class StringPath
     attr_reader :path, :universe
 
-    def initialize(path, universe)
+    def initialize(path, universe, metadata = [])
       @path = prepare(path)
-      @universe = Set.new(universe.map { |entry| prepare(entry) })
-      @universe.add('./')
+      @universe = universe.map { |entry| prepare(entry) }
+      @universe << './' unless @universe.include?('./')
+      @metadata = metadata
     end
 
     def to_s
@@ -84,6 +85,11 @@ module Gitlab
       children.select(&:file?)
     end
 
+    def metadata
+      index = @universe.index(@path)
+      @metadata[index]
+    end
+
     def ==(other)
       @path == other.path && @universe == other.universe
     end

spec/lib/gitlab/string_path_spec.rb

@@ -140,4 +140,20 @@ describe Gitlab::StringPath do
       it { expect(subject.count).to eq 3 }
     end
   end
+
+  describe '#metadata' do
+    let(:universe) do
+      ['path/', 'path/file1', 'path/file2']
+    end
+
+    let(:metadata) do
+      [{ name: '/path/'}, { name: '/path/file1' }, { name: '/path/file2' }]
+    end
+
+    subject do
+      described_class.new('path/file1', universe, metadata).metadata[:name]
+    end
+
+    it { is_expected.to eq '/path/file1' }
+  end
 end