1 files changed, 78 insertions, 0 deletions
diff --git a/app/services/packages/maven/metadata/sync_service.rb b/app/services/packages/maven/metadata/sync_service.rb
new file mode 100644
index 00000000000..ab45e30c4f7
--- /dev/null
+++ b/app/services/packages/maven/metadata/sync_service.rb
@@ -0,0 +1,78 @@
+# frozen_string_literal: true
+
+module Packages
+  module Maven
+    module Metadata
+      class SyncService < BaseContainerService
+        include Gitlab::Utils::StrongMemoize
+
+        alias_method :project, :container
+
+        MAX_FILE_SIZE = 10.megabytes.freeze
+
+        def execute
+          return error('Blank package name') unless package_name
+          return error('Not allowed') unless Ability.allowed?(current_user, :destroy_package, project)
+          return error('Non existing versionless package') unless versionless_package_for_versions
+          return error('Non existing metadata file for versions') unless metadata_package_file_for_versions
+
+          update_versions_xml
+        end
+
+        private
+
+        def update_versions_xml
+          return error('Metadata file for versions is too big') if metadata_package_file_for_versions.size > MAX_FILE_SIZE
+
+          metadata_package_file_for_versions.file.use_open_file do |file|
+            result = CreateVersionsXmlService.new(metadata_content: file, package: versionless_package_for_versions)
+                                             .execute
+
+            next result unless result.success?
+            next success('No changes for versions xml') unless result.payload[:changes_exist]
+
+            if result.payload[:empty_versions]
+              versionless_package_for_versions.destroy!
+              success('Versionless package for versions destroyed')
+            else
+              AppendPackageFileService.new(metadata_content: result.payload[:metadata_content], package: versionless_package_for_versions)
+                                      .execute
+            end
+          end
+        end
+
+        def metadata_package_file_for_versions
+          strong_memoize(:metadata_file_for_versions) do
+            versionless_package_for_versions.package_files
+                                            .with_file_name(Metadata.filename)
+                                            .recent
+                                            .first
+          end
+        end
+
+        def versionless_package_for_versions
+          strong_memoize(:versionless_package_for_versions) do
+            project.packages
+                   .maven
+                   .displayable
+                   .with_name(package_name)
+                   .with_version(nil)
+                   .first
+          end
+        end
+
+        def package_name
+          params[:package_name]
+        end
+
+        def error(message)
+          ServiceResponse.error(message: message)
+        end
+
+        def success(message)
+          ServiceResponse.success(message: message)
+        end
+      end
+    end
+  end
+end