package com.atlassian.asap.core.server;
   
   import org.apache.commons.lang3.StringUtils;
   import org.slf4j.Logger;
   import org.slf4j.LoggerFactory;
   
   import java.util.Set;
   import java.util.regex.Pattern;
   import java.util.stream.Collectors;
  
  import static org.apache.commons.lang3.StringUtils.defaultIfBlank;
  
  /**
   * A command line interface for {@link SimpleServer}.
   */
  public class SimpleServerRunner {
      /**
       * Port to listen on.
       */
      public static final String PORT_SYSPROP = "asap.port";
  
      /**
       * System property that specifies the base URL of the public key server repository to use.
       */
      public static final String PUBLIC_KEY_SERVER_URL_SYSPROP = "asap.public.key.repo.url";
  
      /**
       * System property that specifies the resource server audience.
       */
      public static final String RESOURCE_SERVER_AUDIENCE_SYSPROP = "asap.resource.server.audience";
  
      /**
       * System property that specifies the authorized subjects for the resource.
       * The authorized subjects must be a comma separated string of subject names without any whitespaces
       */
      public static final String AUTHORIZED_SUBJECT_SYSPROP = "asap.resource.server.authorized.subjects";
  
      /**
       * System property that specifies the authorized issuers for the resource.
       * The authorized issuers must be a comma separated string of issuer names without any whitespaces.
       * If omitted or empty, the authorized issuers are equal to the authorized subjects.
       */
      public static final String AUTHORIZED_ISSUER_SYSPROP = "asap.resource.server.authorized.issuer";
  
      private static String DEFAULT_PUBLIC_KEY_REPO = "classpath://publickeyrepo/";
  
      private static final Logger logger = LoggerFactory.getLogger(SimpleServerRunner.class);
  
      /**
       * Main function to run the server.
       *
       * @param args command line arguments
       * @throws Exception if the server fails to start
       */
      public static void main(String[] args) throws Exception {
          int port = Integer.getInteger(PORT_SYSPROP, 8080);
  
          String publicKeyBaseUrl = defaultIfBlank(System.getProperty(PUBLIC_KEY_SERVER_URL_SYSPROP), DEFAULT_PUBLIC_KEY_REPO);
          String audience = defaultIfBlank(System.getProperty(RESOURCE_SERVER_AUDIENCE_SYSPROP), "test-resource-server");
          String authorizedSubjectsString = defaultIfBlank(System.getProperty(AUTHORIZED_SUBJECT_SYSPROP), "issuer1,issuer2,issuer3");
          String authorizedIssuersString = defaultIfBlank(System.getProperty(AUTHORIZED_ISSUER_SYSPROP), authorizedSubjectsString);
          Set<String> authorizedSubjects = Pattern.compile(",").splitAsStream(authorizedSubjectsString).filter(StringUtils::isNotEmpty).collect(Collectors.toSet());
          Set<String> authorizedIssuers = Pattern.compile(",").splitAsStream(authorizedIssuersString).filter(StringUtils::isNotEmpty).collect(Collectors.toSet());
  
          SimpleServer simpleServer = new SimpleServer(port, publicKeyBaseUrl, audience, authorizedSubjects, authorizedIssuers);
  
          logger.info("Server initialized with: Audience: {}, pkPath: {}, authorized subjects: {}, authorized issuers: {}",
                  audience, publicKeyBaseUrl, authorizedSubjects, authorizedIssuers);
  
          simpleServer.start();
      }
  }