1 files changed, 56 insertions, 0 deletions
diff --git a/lib/gitlab/ci/secure_files/cer.rb b/lib/gitlab/ci/secure_files/cer.rb
new file mode 100644
index 00000000000..45d2898c29b
--- /dev/null
+++ b/lib/gitlab/ci/secure_files/cer.rb
@@ -0,0 +1,56 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Ci
+    module SecureFiles
+      class Cer
+        include Gitlab::Utils::StrongMemoize
+
+        attr_reader :error
+
+        def initialize(filedata)
+          @filedata = filedata
+          @error    = nil
+        end
+
+        def certificate_data
+          OpenSSL::X509::Certificate.new(@filedata)
+        rescue OpenSSL::X509::CertificateError => err
+          @error = err.to_s
+          nil
+        end
+        strong_memoize_attr :certificate_data
+
+        def metadata
+          return {} unless certificate_data
+
+          {
+            issuer: issuer,
+            subject: subject,
+            id: id,
+            expires_at: expires_at
+          }
+        end
+        strong_memoize_attr :metadata
+
+        private
+
+        def expires_at
+          certificate_data.not_before
+        end
+
+        def id
+          certificate_data.serial.to_s
+        end
+
+        def issuer
+          X509Name.parse(certificate_data.issuer)
+        end
+
+        def subject
+          X509Name.parse(certificate_data.subject)
+        end
+      end
+    end
+  end
+end