1 files changed, 71 insertions, 0 deletions
diff --git a/app/presenters/packages/composer/packages_presenter.rb b/app/presenters/packages/composer/packages_presenter.rb
new file mode 100644
index 00000000000..84f266989e9
--- /dev/null
+++ b/app/presenters/packages/composer/packages_presenter.rb
@@ -0,0 +1,71 @@
+# frozen_string_literal: true
+
+module Packages
+  module Composer
+    class PackagesPresenter
+      include API::Helpers::RelatedResourcesHelpers
+
+      def initialize(group, packages)
+        @group = group
+        @packages = packages
+      end
+
+      def root
+        path = api_v4_group___packages_composer_package_name_path({ id: @group.id, package_name: '%package%', format: '.json' }, true)
+        { 'packages' => [], 'provider-includes' => { 'p/%hash%.json' => { 'sha256' => provider_sha } }, 'providers-url' => path }
+      end
+
+      def provider
+        { 'providers' => providers_map }
+      end
+
+      def package_versions(packages = @packages)
+        { 'packages' => { packages.first.name => package_versions_map(packages) } }
+      end
+
+      private
+
+      def package_versions_map(packages)
+        packages.each_with_object({}) do |package, map|
+          map[package.version] = package_metadata(package)
+        end
+      end
+
+      def package_metadata(package)
+        json = package.composer_metadatum.composer_json
+
+        json.merge('dist' => package_dist(package), 'uid' => package.id, 'version' => package.version)
+      end
+
+      def package_dist(package)
+        sha = package.composer_metadatum.target_sha
+        archive_api_path = api_v4_projects_packages_composer_archives_package_name_path({ id: package.project_id, package_name: package.name, format: '.zip' }, true)
+
+        {
+          'type' => 'zip',
+          'url' => expose_url(archive_api_path) + "?sha=#{sha}",
+          'reference' => sha,
+          'shasum' => ''
+        }
+      end
+
+      def providers_map
+        map = {}
+
+        @packages.group_by(&:name).each_pair do |package_name, packages|
+          map[package_name] = { 'sha256' => package_versions_sha(packages) }
+        end
+
+        map
+      end
+
+      def package_versions_sha(packages)
+        Digest::SHA256.hexdigest(package_versions(packages).to_json)
+      end
+
+      def provider_sha
+        Digest::SHA256.hexdigest(provider.to_json)
+      end
+    end
+  end
+end