Initial commit

app/services/auth/auth_token_service.rb

@@ -0,0 +1,48 @@
+# frozen_string_literal: true
+
+require 'auth/token_service'
+
+# Manages tokens for this App
+module Auth
+  class AuthTokenService
+    include Singleton
+
+    def refresh
+      @tokens = mutex.synchronize { obtain_tokens }
+    end
+
+    def access_token
+      ensure_tokens
+      @tokens[:access_token]
+    end
+
+  private
+    def ensure_tokens
+      @tokens ||= mutex.synchronize { obtain_tokens }
+    end
+
+    def obtain_tokens
+      token_source.fetch('client_credentials', client_id, client_secret)
+    end
+
+    def mutex
+      @mutex ||= Mutex.new
+    end
+
+    def token_source
+      @token_source ||= Auth::TokenService.new(auth_url)
+    end
+
+    def client_id
+      AppConfig.auth.client_id
+    end
+
+    def client_secret
+      AppConfig.auth.client_secret
+    end
+
+    def auth_url
+      URI(AppConfig.auth.url)
+    end
+  end
+end