fix: Add openid scope to Doorkeeper configuration

config/locales/en.yml

@@ -1,5 +1,7 @@
 en:
   doorkeeper:
+    scopes:
+      openid: 'Authenticate your account'
     openid_connect:
       errors:
         messages:

lib/doorkeeper/openid_connect.rb

@@ -14,6 +14,10 @@
 require 'doorkeeper'
 
 module Doorkeeper
+  class << self
+    prepend OpenidConnect::DoorkeeperConfiguration
+  end
+
   module OpenidConnect
     def self.configured?
       @config.present?

lib/doorkeeper/openid_connect/config.rb

@@ -1,5 +1,12 @@
 module Doorkeeper
   module OpenidConnect
+    module DoorkeeperConfiguration
+      def configure(&block)
+        super(&block)
+        configuration.optional_scopes.add :openid
+      end
+    end
+
     class MissingConfiguration < StandardError
       def initialize
         super('Configuration for Doorkeeper OpenID Connect missing. Do you have doorkeeper_openid_connect initializer?')
@@ -11,7 +18,7 @@ def self.configure(&block)
     end
 
     def self.configuration
-      @config || (fail MissingConfiguration.new)
+      @config || (fail MissingConfiguration)
     end
 
     class Config

spec/lib/doorkeeper/openid_connect/config_spec.rb

@@ -3,6 +3,12 @@
 describe Doorkeeper::OpenidConnect, 'configuration' do
   subject { Doorkeeper::OpenidConnect.configuration }
 
+  describe 'scopes' do
+    it' adds the openid scope to the Doorkeeper configuration' do
+      expect(Doorkeeper.configuration.scopes).to include 'openid'
+    end
+  end
+
   describe 'jws_private_key' do
     it 'sets the value that is accessible via jws_private_key' do
       value = ''