added acme-client gem

16 files changed, 763 insertions, 0 deletions

diff --git a/vendor/acme-client/lib/acme/client.rb b/vendor/acme-client/lib/acme/client.rb
new file mode 100644
index 0000000..801479e
--- /dev/null
+++ b/vendor/acme-client/lib/acme/client.rb
@@ -0,0 +1,122 @@
+# frozen_string_literal: true
+
+require 'faraday'
+require 'json'
+require 'openssl'
+require 'digest'
+require 'forwardable'
+require 'base64'
+require 'time'
+
+module Acme; end
+class Acme::Client; end
+
+require 'acme/client/version'
+require 'acme/client/certificate'
+require 'acme/client/certificate_request'
+require 'acme/client/self_sign_certificate'
+require 'acme/client/crypto'
+require 'acme/client/resources'
+require 'acme/client/faraday_middleware'
+require 'acme/client/error'
+
+class Acme::Client
+  DEFAULT_ENDPOINT = 'http://127.0.0.1:4000'.freeze
+  DIRECTORY_DEFAULT = {
+    'new-authz' => '/acme/new-authz',
+    'new-cert' => '/acme/new-cert',
+    'new-reg' => '/acme/new-reg',
+    'revoke-cert' => '/acme/revoke-cert'
+  }.freeze
+
+  def initialize(private_key:, endpoint: DEFAULT_ENDPOINT, directory_uri: nil, connection_options: {})
+    @endpoint, @private_key, @directory_uri, @connection_options = endpoint, private_key, directory_uri, connection_options
+    @nonces ||= []
+    load_directory!
+  end
+
+  attr_reader :private_key, :nonces, :operation_endpoints
+
+  def register(contact:)
+    payload = {
+      resource: 'new-reg', contact: Array(contact)
+    }
+
+    response = connection.post(@operation_endpoints.fetch('new-reg'), payload)
+    ::Acme::Client::Resources::Registration.new(self, response)
+  end
+
+  def authorize(domain:)
+    payload = {
+      resource: 'new-authz',
+      identifier: {
+        type: 'dns',
+        value: domain
+      }
+    }
+
+    response = connection.post(@operation_endpoints.fetch('new-authz'), payload)
+    ::Acme::Client::Resources::Authorization.new(self, response.headers['Location'], response)
+  end
+
+  def fetch_authorization(uri)
+    response = connection.get(uri)
+    ::Acme::Client::Resources::Authorization.new(self, uri, response)
+  end
+
+  def new_certificate(csr)
+    payload = {
+      resource: 'new-cert',
+      csr: Base64.urlsafe_encode64(csr.to_der)
+    }
+
+    response = connection.post(@operation_endpoints.fetch('new-cert'), payload)
+    ::Acme::Client::Certificate.new(OpenSSL::X509::Certificate.new(response.body), response.headers['location'], fetch_chain(response), csr)
+  end
+
+  def revoke_certificate(certificate)
+    payload = { resource: 'revoke-cert', certificate: Base64.urlsafe_encode64(certificate.to_der) }
+    endpoint = @operation_endpoints.fetch('revoke-cert')
+    response = connection.post(endpoint, payload)
+    response.success?
+  end
+
+  def self.revoke_certificate(certificate, *arguments)
+    client = new(*arguments)
+    client.revoke_certificate(certificate)
+  end
+
+  def connection
+    @connection ||= Faraday.new(@endpoint, **@connection_options) do |configuration|
+      configuration.use Acme::Client::FaradayMiddleware, client: self
+      configuration.adapter Faraday.default_adapter
+    end
+  end
+
+  private
+
+  def fetch_chain(response, limit = 10)
+    links = response.headers['link']
+    if limit.zero? || links.nil? || links['up'].nil?
+      []
+    else
+      issuer = connection.get(links['up'])
+      [OpenSSL::X509::Certificate.new(issuer.body), *fetch_chain(issuer, limit - 1)]
+    end
+  end
+
+  def load_directory!
+    @operation_endpoints = if @directory_uri
+      response = connection.get(@directory_uri)
+      body = response.body
+      {
+        'new-reg' => body.fetch('new-reg'),
+        'new-authz' => body.fetch('new-authz'),
+        'new-cert' => body.fetch('new-cert'),
+        'revoke-cert' => body.fetch('revoke-cert'),
+      }
+    else
+      DIRECTORY_DEFAULT
+    end
+  end
+end
diff --git a/vendor/acme-client/lib/acme/client/certificate.rb b/vendor/acme-client/lib/acme/client/certificate.rb
new file mode 100644
index 0000000..6c68cc5
--- /dev/null
+++ b/vendor/acme-client/lib/acme/client/certificate.rb
@@ -0,0 +1,30 @@
+class Acme::Client::Certificate
+  extend Forwardable
+
+  attr_reader :x509, :x509_chain, :request, :private_key, :url
+
+  def_delegators :x509, :to_pem, :to_der
+
+  def initialize(certificate, url, chain, request)
+    @x509 = certificate
+    @url = url
+    @x509_chain = chain
+    @request = request
+  end
+
+  def chain_to_pem
+    x509_chain.map(&:to_pem).join
+  end
+
+  def x509_fullchain
+    [x509, *x509_chain]
+  end
+
+  def fullchain_to_pem
+    x509_fullchain.map(&:to_pem).join
+  end
+
+  def common_name
+    x509.subject.to_a.find { |name, _, _| name == 'CN' }[1]
+  end
+end
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
diff --git a/vendor/acme-client/lib/acme/client/crypto.rb b/vendor/acme-client/lib/acme/client/crypto.rb
new file mode 100644
index 0000000..dfa5cdc
--- /dev/null
+++ b/vendor/acme-client/lib/acme/client/crypto.rb
@@ -0,0 +1,98 @@
+class Acme::Client::Crypto
+  attr_reader :private_key
+
+  def initialize(private_key)
+    @private_key = private_key
+  end
+
+  def generate_signed_jws(header:, payload:)
+    header = { typ: 'JWT', alg: jws_alg, jwk: jwk }.merge(header)
+
+    encoded_header = urlsafe_base64(header.to_json)
+    encoded_payload = urlsafe_base64(payload.to_json)
+    signature_data = "#{encoded_header}.#{encoded_payload}"
+
+    signature = private_key.sign digest, signature_data
+    encoded_signature = urlsafe_base64(signature)
+
+    {
+      protected: encoded_header,
+      payload: encoded_payload,
+      signature: encoded_signature
+    }.to_json
+  end
+
+  def thumbprint
+    urlsafe_base64 digest.digest(jwk.to_json)
+  end
+
+  def digest
+    OpenSSL::Digest::SHA256.new
+  end
+
+  def urlsafe_base64(data)
+    Base64.urlsafe_encode64(data).sub(/[\s=]*\z/, '')
+  end
+
+  private
+
+  def jws_alg
+    { 'RSA' => 'RS256', 'EC' => 'ES256' }.fetch(jwk[:kty])
+  end
+
+  def jwk
+    @jwk ||= case private_key
+             when OpenSSL::PKey::RSA
+               rsa_jwk
+             when OpenSSL::PKey::EC
+               ec_jwk
+             else
+               raise ArgumentError, "Can't handle #{private_key} as private key, only OpenSSL::PKey::RSA and OpenSSL::PKey::EC"
+    end
+  end
+
+  def rsa_jwk
+    {
+      e: urlsafe_base64(public_key.e.to_s(2)),
+      kty: 'RSA',
+      n: urlsafe_base64(public_key.n.to_s(2))
+    }
+  end
+
+  def ec_jwk
+    {
+      crv: curve_name,
+      kty: 'EC',
+      x: urlsafe_base64(coordinates[:x].to_s(2)),
+      y: urlsafe_base64(coordinates[:y].to_s(2))
+    }
+  end
+
+  def curve_name
+    {
+      'prime256v1' => 'P-256',
+      'secp384r1' => 'P-384',
+      'secp521r1' => 'P-521'
+    }.fetch(private_key.group.curve_name) { raise ArgumentError, 'Unknown EC curve' }
+  end
+
+  # rubocop:disable Metrics/AbcSize
+  def coordinates
+    @coordinates ||= begin
+      hex = public_key.to_bn.to_s(16)
+      data_len = hex.length - 2
+      hex_x = hex[2, data_len / 2]
+      hex_y = hex[2 + data_len / 2, data_len / 2]
+
+      {
+        x: OpenSSL::BN.new([hex_x].pack('H*'), 2),
+        y: OpenSSL::BN.new([hex_y].pack('H*'), 2)
+      }
+    end
+  end
+  # rubocop:enable Metrics/AbcSize
+
+  def public_key
+    @public_key ||= private_key.public_key
+  end
+end
diff --git a/vendor/acme-client/lib/acme/client/error.rb b/vendor/acme-client/lib/acme/client/error.rb
new file mode 100644
index 0000000..2b35623
--- /dev/null
+++ b/vendor/acme-client/lib/acme/client/error.rb
@@ -0,0 +1,16 @@
+class Acme::Client::Error < StandardError
+  class NotFound < Acme::Client::Error; end
+  class BadCSR < Acme::Client::Error; end
+  class BadNonce < Acme::Client::Error; end
+  class Connection < Acme::Client::Error; end
+  class Dnssec < Acme::Client::Error; end
+  class Malformed < Acme::Client::Error; end
+  class ServerInternal < Acme::Client::Error; end
+  class Acme::Tls < Acme::Client::Error; end
+  class Unauthorized < Acme::Client::Error; end
+  class UnknownHost < Acme::Client::Error; end
+  class Timeout < Acme::Client::Error; end
+  class RateLimited < Acme::Client::Error; end
+  class RejectedIdentifier < Acme::Client::Error; end
+  class UnsupportedIdentifier < Acme::Client::Error; end
+end
diff --git a/vendor/acme-client/lib/acme/client/faraday_middleware.rb b/vendor/acme-client/lib/acme/client/faraday_middleware.rb
new file mode 100644
index 0000000..21e29c9
--- /dev/null
+++ b/vendor/acme-client/lib/acme/client/faraday_middleware.rb
@@ -0,0 +1,123 @@
+# frozen_string_literal: true
+
+class Acme::Client::FaradayMiddleware < Faraday::Middleware
+  attr_reader :env, :response, :client
+
+  repo_url = 'https://github.com/unixcharles/acme-client'
+  USER_AGENT = "Acme::Client v#{Acme::Client::VERSION} (#{repo_url})".freeze
+
+  def initialize(app, client:)
+    super(app)
+    @client = client
+  end
+
+  def call(env)
+    @env = env
+    @env[:request_headers]['User-Agent'] = USER_AGENT
+    @env.body = crypto.generate_signed_jws(header: { nonce: pop_nonce }, payload: env.body)
+    @app.call(env).on_complete { |response_env| on_complete(response_env) }
+  rescue Faraday::TimeoutError
+    raise Acme::Client::Error::Timeout
+  end
+
+  def on_complete(env)
+    @env = env
+
+    raise_on_not_found!
+    store_nonce
+    env.body = decode_body
+    env.response_headers['Link'] = decode_link_headers
+
+    return if env.success?
+
+    raise_on_error!
+  end
+
+  private
+
+  def raise_on_not_found!
+    raise Acme::Client::Error::NotFound, env.url.to_s if env.status == 404
+  end
+
+  def raise_on_error!
+    raise error_class, error_message
+  end
+
+  def error_message
+    if env.body.is_a? Hash
+      env.body['detail']
+    else
+      "Error message: #{env.body}"
+    end
+  end
+
+  def error_class
+    if error_name && !error_name.empty? && Acme::Client::Error.const_defined?(error_name)
+      Object.const_get("Acme::Client::Error::#{error_name}")
+    else
+      Acme::Client::Error
+    end
+  end
+
+  def error_name
+    @error_name ||= begin
+      return unless env.body.is_a?(Hash)
+      return unless env.body.key?('type')
+
+      env.body['type'].gsub('urn:acme:error:', '').split(/[_-]/).map(&:capitalize).join
+    end
+  end
+
+  def decode_body
+    content_type = env.response_headers['Content-Type']
+
+    if content_type == 'application/json' || content_type == 'application/problem+json'
+      JSON.load(env.body)
+    else
+      env.body
+    end
+  end
+
+  LINK_MATCH = /<(.*?)>;rel="([\w-]+)"/
+
+  def decode_link_headers
+    return unless env.response_headers.key?('Link')
+    link_header = env.response_headers['Link']
+
+    links = link_header.split(', ').map { |entry|
+      _, link, name = *entry.match(LINK_MATCH)
+      [name, link]
+    }
+
+    Hash[*links.flatten]
+  end
+
+  def store_nonce
+    nonces << env.response_headers['replay-nonce']
+  end
+
+  def pop_nonce
+    if nonces.empty?
+      get_nonce
+    else
+      nonces.pop
+    end
+  end
+
+  def get_nonce
+    response = Faraday.head(env.url, nil, 'User-Agent' => USER_AGENT)
+    response.headers['replay-nonce']
+  end
+
+  def nonces
+    client.nonces
+  end
+
+  def private_key
+    client.private_key
+  end
+
+  def crypto
+    @crypto ||= Acme::Client::Crypto.new(private_key)
+  end
+end
diff --git a/vendor/acme-client/lib/acme/client/resources.rb b/vendor/acme-client/lib/acme/client/resources.rb
new file mode 100644
index 0000000..ad55688
--- /dev/null
+++ b/vendor/acme-client/lib/acme/client/resources.rb
@@ -0,0 +1,5 @@
+module Acme::Client::Resources; end
+
+require 'acme/client/resources/registration'
+require 'acme/client/resources/challenges'
+require 'acme/client/resources/authorization'
diff --git a/vendor/acme-client/lib/acme/client/resources/authorization.rb b/vendor/acme-client/lib/acme/client/resources/authorization.rb
new file mode 100644
index 0000000..9ca2e76
--- /dev/null
+++ b/vendor/acme-client/lib/acme/client/resources/authorization.rb
@@ -0,0 +1,44 @@
+class Acme::Client::Resources::Authorization
+  HTTP01 = Acme::Client::Resources::Challenges::HTTP01
+  DNS01 = Acme::Client::Resources::Challenges::DNS01
+  TLSSNI01 = Acme::Client::Resources::Challenges::TLSSNI01
+
+  attr_reader :client, :uri, :domain, :status, :expires, :http01, :dns01, :tls_sni01
+
+  def initialize(client, uri, response)
+    @client = client
+    @uri = uri
+    assign_attributes(response.body)
+  end
+
+  def verify_status
+    response = @client.connection.get(@uri)
+
+    assign_attributes(response.body)
+    status
+  end
+
+  private
+
+  def assign_attributes(body)
+    @expires = Time.iso8601(body['expires']) if body.key? 'expires'
+    @domain = body['identifier']['value']
+    @status = body['status']
+    assign_challenges(body['challenges'])
+  end
+
+  def assign_challenges(challenges)
+    challenges.each do |attributes|
+      challenge = case attributes.fetch('type')
+                  when 'http-01'
+                    @http01 ||= HTTP01.new(self)
+                  when 'dns-01'
+                    @dns01 ||= DNS01.new(self)
+                  when 'tls-sni-01'
+                    @tls_sni01 ||= TLSSNI01.new(self)
+      end
+
+      challenge.assign_attributes(attributes) if challenge
+    end
+  end
+end
diff --git a/vendor/acme-client/lib/acme/client/resources/challenges.rb b/vendor/acme-client/lib/acme/client/resources/challenges.rb
new file mode 100644
index 0000000..ec92d47
--- /dev/null
+++ b/vendor/acme-client/lib/acme/client/resources/challenges.rb
@@ -0,0 +1,6 @@
+module Acme::Client::Resources::Challenges; end
+
+require 'acme/client/resources/challenges/base'
+require 'acme/client/resources/challenges/http01'
+require 'acme/client/resources/challenges/dns01'
+require 'acme/client/resources/challenges/tls_sni01'
diff --git a/vendor/acme-client/lib/acme/client/resources/challenges/base.rb b/vendor/acme-client/lib/acme/client/resources/challenges/base.rb
new file mode 100644
index 0000000..c78c74e
--- /dev/null
+++ b/vendor/acme-client/lib/acme/client/resources/challenges/base.rb
@@ -0,0 +1,43 @@
+class Acme::Client::Resources::Challenges::Base
+  attr_reader :authorization, :status, :uri, :token, :error
+
+  def initialize(authorization)
+    @authorization = authorization
+  end
+
+  def client
+    authorization.client
+  end
+
+  def verify_status
+    authorization.verify_status
+
+    status
+  end
+
+  def request_verification
+    response = client.connection.post(@uri, resource: 'challenge', type: challenge_type, keyAuthorization: authorization_key)
+    response.success?
+  end
+
+  def assign_attributes(attributes)
+    @status = attributes.fetch('status', 'pending')
+    @uri = attributes.fetch('uri')
+    @token = attributes.fetch('token')
+    @error = attributes['error']
+  end
+
+  private
+
+  def challenge_type
+    self.class::CHALLENGE_TYPE
+  end
+
+  def authorization_key
+    "#{token}.#{crypto.thumbprint}"
+  end
+
+  def crypto
+    @crypto ||= Acme::Client::Crypto.new(client.private_key)
+  end
+end
diff --git a/vendor/acme-client/lib/acme/client/resources/challenges/dns01.rb b/vendor/acme-client/lib/acme/client/resources/challenges/dns01.rb
new file mode 100644
index 0000000..543f438
--- /dev/null
+++ b/vendor/acme-client/lib/acme/client/resources/challenges/dns01.rb
@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+class Acme::Client::Resources::Challenges::DNS01 < Acme::Client::Resources::Challenges::Base
+  CHALLENGE_TYPE = 'dns-01'.freeze
+  RECORD_NAME = '_acme-challenge'.freeze
+  RECORD_TYPE = 'TXT'.freeze
+
+  def record_name
+    RECORD_NAME
+  end
+
+  def record_type
+    RECORD_TYPE
+  end
+
+  def record_content
+    crypto.urlsafe_base64(crypto.digest.digest(authorization_key))
+  end
+end
diff --git a/vendor/acme-client/lib/acme/client/resources/challenges/http01.rb b/vendor/acme-client/lib/acme/client/resources/challenges/http01.rb
new file mode 100644
index 0000000..4966091
--- /dev/null
+++ b/vendor/acme-client/lib/acme/client/resources/challenges/http01.rb
@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+class Acme::Client::Resources::Challenges::HTTP01 < Acme::Client::Resources::Challenges::Base
+  CHALLENGE_TYPE = 'http-01'.freeze
+  CONTENT_TYPE = 'text/plain'.freeze
+
+  def content_type
+    CONTENT_TYPE
+  end
+
+  def file_content
+    authorization_key
+  end
+
+  def filename
+    ".well-known/acme-challenge/#{token}"
+  end
+end
diff --git a/vendor/acme-client/lib/acme/client/resources/challenges/tls_sni01.rb b/vendor/acme-client/lib/acme/client/resources/challenges/tls_sni01.rb
new file mode 100644
index 0000000..8f455f5
--- /dev/null
+++ b/vendor/acme-client/lib/acme/client/resources/challenges/tls_sni01.rb
@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+class Acme::Client::Resources::Challenges::TLSSNI01 < Acme::Client::Resources::Challenges::Base
+  CHALLENGE_TYPE = 'tls-sni-01'.freeze
+
+  def hostname
+    digest = crypto.digest.hexdigest(authorization_key)
+    "#{digest[0..31]}.#{digest[32..64]}.acme.invalid"
+  end
+
+  def certificate
+    self_sign_certificate.certificate
+  end
+
+  def private_key
+    self_sign_certificate.private_key
+  end
+
+  private
+
+  def self_sign_certificate
+    @self_sign_certificate ||= Acme::Client::SelfSignCertificate.new(subject_alt_names: [hostname])
+  end
+end
diff --git a/vendor/acme-client/lib/acme/client/resources/registration.rb b/vendor/acme-client/lib/acme/client/resources/registration.rb
new file mode 100644
index 0000000..b7a4c11
--- /dev/null
+++ b/vendor/acme-client/lib/acme/client/resources/registration.rb
@@ -0,0 +1,37 @@
+class Acme::Client::Resources::Registration
+  attr_reader :id, :key, :contact, :uri, :next_uri, :recover_uri, :term_of_service_uri
+
+  def initialize(client, response)
+    @client = client
+    @uri = response.headers['location']
+    assign_links(response.headers['Link'])
+    assign_attributes(response.body)
+  end
+
+  def get_terms
+    return unless @term_of_service_uri
+
+    @client.connection.get(@term_of_service_uri).body
+  end
+
+  def agree_terms
+    return true unless @term_of_service_uri
+
+    response = @client.connection.post(@uri, resource: 'reg', agreement: @term_of_service_uri)
+    response.success?
+  end
+
+  private
+
+  def assign_links(links)
+    @next_uri = links['next']
+    @recover_uri = links['recover']
+    @term_of_service_uri = links['terms-of-service']
+  end
+
+  def assign_attributes(body)
+    @id = body['id']
+    @key = body['key']
+    @contact = body['contact']
+  end
+end
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
diff --git a/vendor/acme-client/lib/acme/client/version.rb b/vendor/acme-client/lib/acme/client/version.rb
new file mode 100644
index 0000000..c989c12
--- /dev/null
+++ b/vendor/acme-client/lib/acme/client/version.rb
@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+module Acme
+  class Client
+    VERSION = '0.4.1'.freeze
+  end
+end