1 files changed, 60 insertions, 0 deletions
diff --git a/vendor/acme-client/lib/acme/client/self_sign_certificate.rb b/vendor/acme-client/lib/acme/client/self_sign_certificate.rb
new file mode 100644
index 0000000..2e7d98c
--- /dev/null
+++ b/vendor/acme-client/lib/acme/client/self_sign_certificate.rb
@@ -0,0 +1,60 @@
+class Acme::Client::SelfSignCertificate
+  attr_reader :private_key, :subject_alt_names, :not_before, :not_after
+
+  extend Forwardable
+  def_delegators :certificate, :to_pem, :to_der
+
+  def initialize(subject_alt_names:, not_before: default_not_before, not_after: default_not_after, private_key: generate_private_key)
+    @private_key = private_key
+    @subject_alt_names = subject_alt_names
+    @not_before = not_before
+    @not_after = not_after
+  end
+
+  def certificate
+    @certificate ||= begin
+      certificate = generate_certificate
+
+      extension_factory = generate_extension_factory(certificate)
+      subject_alt_name_entry = subject_alt_names.map { |d| "DNS: #{d}" }.join(',')
+      subject_alt_name_extension = extension_factory.create_extension('subjectAltName', subject_alt_name_entry)
+      certificate.add_extension(subject_alt_name_extension)
+
+      certificate.sign(private_key, digest)
+    end
+  end
+
+  private
+
+  def generate_private_key
+    OpenSSL::PKey::RSA.new(2048)
+  end
+
+  def default_not_before
+    Time.now - 3600
+  end
+
+  def default_not_after
+    Time.now + 30 * 24 * 3600
+  end
+
+  def digest
+    OpenSSL::Digest::SHA256.new
+  end
+
+  def generate_certificate
+    certificate = OpenSSL::X509::Certificate.new
+    certificate.not_before = not_before
+    certificate.not_after = not_after
+    certificate.public_key = private_key.public_key
+    certificate.version = 2
+    certificate
+  end
+
+  def generate_extension_factory(certificate)
+    extension_factory = OpenSSL::X509::ExtensionFactory.new
+    extension_factory.subject_certificate = certificate
+    extension_factory.issuer_certificate = certificate
+    extension_factory
+  end
+end