1 files changed, 62 insertions, 0 deletions
diff --git a/app/finders/packages/maven/package_finder.rb b/app/finders/packages/maven/package_finder.rb
new file mode 100644
index 00000000000..775db12adb7
--- /dev/null
+++ b/app/finders/packages/maven/package_finder.rb
@@ -0,0 +1,62 @@
+# frozen_string_literal: true
+module Packages
+  module Maven
+    class PackageFinder
+      attr_reader :path, :current_user, :project, :group
+
+      def initialize(path, current_user, project: nil, group: nil)
+        @path = path
+        @current_user = current_user
+        @project = project
+        @group = group
+      end
+
+      def execute
+        packages_with_path.last
+      end
+
+      def execute!
+        packages_with_path.last!
+      end
+
+      private
+
+      def base
+        if project
+          packages_for_a_single_project
+        elsif group
+          packages_for_multiple_projects
+        else
+          packages
+        end
+      end
+
+      def packages_with_path
+        base.only_maven_packages_with_path(path)
+      end
+
+      # Produces a query that returns all packages.
+      def packages
+        ::Packages::Package.all
+      end
+
+      # Produces a query that retrieves packages from a single project.
+      def packages_for_a_single_project
+        project.packages
+      end
+
+      # Produces a query that retrieves packages from multiple projects that
+      # the current user can view within a group.
+      def packages_for_multiple_projects
+        ::Packages::Package.for_projects(projects_visible_to_current_user)
+      end
+
+      # Returns the projects that the current user can view within a group.
+      def projects_visible_to_current_user
+        ::Project
+          .in_namespace(group.self_and_descendants.select(:id))
+          .public_or_visible_to_user(current_user)
+      end
+    end
+  end
+end