package com.atlassian.asap.service.core.service;
   
   import com.google.common.annotations.VisibleForTesting;
   
   import java.util.Optional;
   import java.util.function.Function;
   
   @SuppressWarnings("WeakerAccess")
   public class EnvVarAsapConfiguration extends StringValuesAsapConfiguration {
      // These are the environment variables that Micros uses when a service descriptor includes "requiresAsap: true".
      static final String ASAP_ISSUER = "ASAP_ISSUER";
      static final String ASAP_KEY_ID = "ASAP_KEY_ID";
      static final String ASAP_AUDIENCE = "ASAP_AUDIENCE";
      static final String ASAP_PUBLIC_KEY_REPOSITORY_URL = "ASAP_PUBLIC_KEY_REPOSITORY_URL";
      static final String ASAP_PRIVATE_KEY = "ASAP_PRIVATE_KEY";
  
      public EnvVarAsapConfiguration(String defaultIssuer, String defaultKeyId, String defaultAudience) {
          this(defaultIssuer, defaultKeyId, defaultAudience, varName -> Optional.ofNullable(System.getenv(varName)));
      }
  
      @VisibleForTesting
      EnvVarAsapConfiguration(String defaultIssuer, String defaultKeyId, String defaultAudience,
                              Function<String, Optional<String>> getenv) {
          super(getenv.apply(ASAP_ISSUER).orElse(defaultIssuer),
                  getenv.apply(ASAP_KEY_ID).orElse(defaultKeyId),
                  getenv.apply(ASAP_AUDIENCE).orElse(defaultAudience),
                  getenv.apply(ASAP_PUBLIC_KEY_REPOSITORY_URL).orElse(""),
                  getenv.apply(ASAP_PRIVATE_KEY).orElse(""));
      }
  }