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    compile group: 'io.ratpack', name: 'ratpack-groovy', version: '1.5.4'
    compile group: 'org.slf4j', name: 'slf4j-simple', version: '1.7.25'
//    compile ratpack.dependency('pac4j') // Don't use this, because we need the org.pac4j version
    compile group: 'org.pac4j', name: 'ratpack-pac4j', version: '2.0.0'
    compile group: 'org.pac4j', name: 'pac4j-core', version: '2.2.1'
    compile group: 'org.pac4j', name: 'pac4j-jwt', version: '2.2.1'
    compile group: 'org.pac4j', name: 'pac4j-http', version: '2.2.1'

all RatpackPac4j.requireAuth(HeaderClient)

  public static <C extends Credentials, U extends CommonProfile> Promise<U> login(Context ctx, Class<? extends Client> clientType) {
    if (isDirect(clientType)) {
      return userProfile(ctx)
        .flatMap(p -> {
          if (p.isPresent()) {
            Optional<U> cast = Types.cast(p);
            return Promise.value(cast);
          } else {
            return performDirectAuthentication(ctx, clientType);
          }
        })
        .route(p -> !p.isPresent(), p -> ctx.clientError(401))
        .map(Optional::get);
    } else {
      return userProfile(ctx)
        .route(p -> !p.isPresent(), p -> initiateAuthentication(ctx, clientType))
        .map(Optional::get)
        .map(Types::<U>cast);
    }