1 files changed, 111 insertions, 0 deletions
diff --git a/vendor/acme-client/lib/acme/client/certificate_request.rb b/vendor/acme-client/lib/acme/client/certificate_request.rb
new file mode 100644
index 0000000..8eae0c6
--- /dev/null
+++ b/vendor/acme-client/lib/acme/client/certificate_request.rb
@@ -0,0 +1,111 @@
+class Acme::Client::CertificateRequest
+  extend Forwardable
+
+  DEFAULT_KEY_LENGTH = 2048
+  DEFAULT_DIGEST = OpenSSL::Digest::SHA256
+  SUBJECT_KEYS = {
+    common_name:         'CN',
+    country_name:        'C',
+    organization_name:   'O',
+    organizational_unit: 'OU',
+    state_or_province:   'ST',
+    locality_name:       'L'
+  }.freeze
+
+  SUBJECT_TYPES = {
+    'CN' => OpenSSL::ASN1::UTF8STRING,
+    'C'  => OpenSSL::ASN1::UTF8STRING,
+    'O'  => OpenSSL::ASN1::UTF8STRING,
+    'OU' => OpenSSL::ASN1::UTF8STRING,
+    'ST' => OpenSSL::ASN1::UTF8STRING,
+    'L'  => OpenSSL::ASN1::UTF8STRING
+  }.freeze
+
+  attr_reader :private_key, :common_name, :names, :subject
+
+  def_delegators :csr, :to_pem, :to_der
+
+  def initialize(common_name: nil, names: [], private_key: generate_private_key, subject: {}, digest: DEFAULT_DIGEST.new)
+    @digest = digest
+    @private_key = private_key
+    @subject = normalize_subject(subject)
+    @common_name = common_name || @subject[SUBJECT_KEYS[:common_name]] || @subject[:common_name]
+    @names = names.to_a.dup
+    normalize_names
+    @subject[SUBJECT_KEYS[:common_name]] ||= @common_name
+    validate_subject
+  end
+
+  def csr
+    @csr ||= generate
+  end
+
+  private
+
+  def generate_private_key
+    OpenSSL::PKey::RSA.new(DEFAULT_KEY_LENGTH)
+  end
+
+  def normalize_subject(subject)
+    @subject = subject.each_with_object({}) do |(key, value), hash|
+      hash[SUBJECT_KEYS.fetch(key, key)] = value.to_s
+    end
+  end
+
+  def normalize_names
+    if @common_name
+      @names.unshift(@common_name) unless @names.include?(@common_name)
+    else
+      raise ArgumentError, 'No common name and no list of names given' if @names.empty?
+      @common_name = @names.first
+    end
+  end
+
+  def validate_subject
+    validate_subject_attributes
+    validate_subject_common_name
+  end
+
+  def validate_subject_attributes
+    extra_keys = @subject.keys - SUBJECT_KEYS.keys - SUBJECT_KEYS.values
+    return if extra_keys.empty?
+    raise ArgumentError, "Unexpected subject attributes given: #{extra_keys.inspect}"
+  end
+
+  def validate_subject_common_name
+    return if @common_name == @subject[SUBJECT_KEYS[:common_name]]
+    raise ArgumentError, 'Conflicting common name given in arguments and subject'
+  end
+
+  def generate
+    OpenSSL::X509::Request.new.tap do |csr|
+      csr.public_key = @private_key.public_key
+      csr.subject = generate_subject
+      csr.version = 2
+      add_extension(csr)
+      csr.sign @private_key, @digest
+    end
+  end
+
+  def generate_subject
+    OpenSSL::X509::Name.new(
+      @subject.map {|name, value|
+        [name, value, SUBJECT_TYPES[name]]
+      }
+    )
+  end
+
+  def add_extension(csr)
+    return if @names.size <= 1
+
+    extension = OpenSSL::X509::ExtensionFactory.new.create_extension(
+      'subjectAltName', @names.map { |name| "DNS:#{name}" }.join(', '), false
+    )
+    csr.add_attribute(
+      OpenSSL::X509::Attribute.new(
+        'extReq',
+        OpenSSL::ASN1::Set.new([OpenSSL::ASN1::Sequence.new([extension])])
+      )
+    )
+  end
+end