Minor improvements in build arfifacts browser

Added also a `Gitlab::Ci::Build::Artifacts::Metadata::ParserError`
exception class.

app/views/projects/artifacts/_tree_file.html.haml

@@ -6,6 +6,6 @@
   %td
     = number_to_human_size(file.metadata[:size], precision: 2)
   %td
-    = link_to file_namespace_project_build_artifacts_path(path: file.path),
+    = link_to file_namespace_project_build_artifacts_path(@project.namespace, @project, @build, path: file.path),
       class: 'btn btn-xs btn-default artifact-download' do
       = icon('download')

config/routes.rb

@@ -609,8 +609,8 @@ Rails.application.routes.draw do
           resource :artifacts, only: [] do
             get :download
-            get :browse, path: 'browse(/*path)', action: :browse, format: false
-            get :file, path: 'file/*path', action: :file, format: false
+            get :browse, path: 'browse(/*path)', format: false
+            get :file, path: 'file/*path', format: false
           end
         end

lib/gitlab/ci/build/artifacts/metadata.rb

@@ -6,6 +6,8 @@ module Gitlab
     module Build
       module Artifacts
         class Metadata
+          class ParserError < StandardError; end
+
           VERSION_PATTERN = /^[\w\s]+(\d+\.\d+\.\d+)/
           INVALID_PATH_PATTERN = %r{(^\.?\.?/)|(/\.?\.?/)}
@@ -24,8 +26,13 @@ module Gitlab
             gzip do |gz|
               read_string(gz) # version
               errors = read_string(gz)
-              raise StandardError, 'Errors field not found!' unless errors
-              JSON.parse(errors)
+              raise ParserError, 'Errors field not found!' unless errors
+
+              begin
+                JSON.parse(errors)
+              rescue JSON::ParserError
+                raise ParserError, 'Invalid errors field!'
+              end
             end
           end
@@ -56,7 +63,7 @@ module Gitlab
                 next unless path =~ match_pattern
                 next if path =~ INVALID_PATH_PATTERN
-                entries.store(path, JSON.parse(meta, symbolize_names: true))
+                entries[path] = JSON.parse(meta, symbolize_names: true)
               rescue JSON::ParserError, Encoding::CompatibilityError
                 next
               end
@@ -70,11 +77,11 @@ module Gitlab
               version_string = read_string(gz)
               unless version_string
-                raise StandardError, 'Artifacts metadata file empty!'
+                raise ParserError, 'Artifacts metadata file empty!'
               end
               unless version_string =~ VERSION_PATTERN
-                raise StandardError, 'Invalid version!'
+                raise ParserError, 'Invalid version!'
               end
               version_string.chomp

lib/gitlab/ci/build/artifacts/metadata/entry.rb

@@ -57,7 +57,7 @@ module Gitlab
           return @children if @children
           child_pattern = %r{^#{Regexp.escape(@path)}[^/]+/?$}
-          @children = select_entries { |entry| entry =~ child_pattern }
+          @children = select_entries { |path| path =~ child_pattern }
         end
         def directories(opts = {})
@@ -110,7 +110,7 @@ module Gitlab
         private
         def select_entries
-          selected = @entries.select { |entry, _metadata| yield entry }
+          selected = @entries.select { |path, _metadata| yield path }
           selected.map { |path, _metadata| self.class.new(path, @entries) }
         end
       end