3 files changed, 61 insertions, 0 deletions
diff --git a/lib/gitlab/audit/deleted_author.rb b/lib/gitlab/audit/deleted_author.rb
new file mode 100644
index 00000000000..e3b8ad5ad21
--- /dev/null
+++ b/lib/gitlab/audit/deleted_author.rb
@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Audit
+    class DeletedAuthor < Gitlab::Audit::NullAuthor
+    end
+  end
+end
diff --git a/lib/gitlab/audit/null_author.rb b/lib/gitlab/audit/null_author.rb
new file mode 100644
index 00000000000..0b0e6a46fe4
--- /dev/null
+++ b/lib/gitlab/audit/null_author.rb
@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Audit
+    class NullAuthor
+      attr_reader :id, :name
+
+      # Creates an Author
+      #
+      # While tracking events that could take place even when
+      # a user is not logged in, (eg: downloading repo of a public project),
+      # we set the author_id of such events as -1
+      #
+      # @param [Integer] id
+      # @param [String] name
+      #
+      # @return [Gitlab::Audit::UnauthenticatedAuthor, Gitlab::Audit::DeletedAuthor]
+      def self.for(id, name)
+        if id == -1
+          Gitlab::Audit::UnauthenticatedAuthor.new(name: name)
+        else
+          Gitlab::Audit::DeletedAuthor.new(id: id, name: name)
+        end
+      end
+
+      def initialize(id:, name:)
+        @id = id
+        @name = name
+      end
+
+      def current_sign_in_ip
+        nil
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/audit/unauthenticated_author.rb b/lib/gitlab/audit/unauthenticated_author.rb
new file mode 100644
index 00000000000..84c323c1950
--- /dev/null
+++ b/lib/gitlab/audit/unauthenticated_author.rb
@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Audit
+    class UnauthenticatedAuthor < Gitlab::Audit::NullAuthor
+      def initialize(name: nil)
+        super(id: -1, name: name)
+      end
+
+      # Events that are authored by unauthenticated users, should be
+      # shown as authored by `An unauthenticated user` in the UI.
+      def name
+        @name || _('An unauthenticated user')
+      end
+    end
+  end
+end