package it.com.atlassian.refapp.rest;
   
   import com.sun.jersey.api.client.Client;
   import com.sun.jersey.api.client.ClientResponse;
   import com.sun.jersey.api.client.WebResource;
   import com.sun.jersey.api.client.config.ClientConfig;
   import com.sun.jersey.api.client.config.DefaultClientConfig;
   import org.codehaus.jackson.JsonNode;
   import org.codehaus.jackson.jaxrs.JacksonJaxbJsonProvider;
  import org.codehaus.jackson.map.ObjectMapper;
  import org.eclipse.jetty.util.MultiPartWriter;
  
  import javax.annotation.Nonnull;
  import java.io.IOException;
  
  /**
   * Rest/Jersey utils, simplified from Confluence com.atlassian.confluence.it.RestHelper and com.atlassian.confluence.rest.client.RestClientFactory
   */
  public final class RestUtils {
      private RestUtils() {}
  
      @Nonnull
      public static WebResource newResource(@Nonnull String url) {
          return newClient().resource(url);
      }
  
      public static JsonNode getJsonResponse(WebResource resource) {
          final String responseString = getJsonResponseString(resource);
          try {
              return new ObjectMapper().readTree(responseString);
          } catch (IOException e) {
              throw new RuntimeException("Could not parse json response from json string : " + responseString, e);
          }
      }
  
      public static String getJsonResponseString(WebResource resource) {
          final ClientResponse response = resource.get(ClientResponse.class);
          try {
              return response.hasEntity() ? response.getEntity(String.class) : null;
          } finally {
              response.close();
          }
      }
  
      private static Client newClient() {
          ClientConfig clientConfig = new DefaultClientConfig();
          clientConfig.getSingletons().add(new JacksonJaxbJsonProvider());
          clientConfig.getClasses().add(MultiPartWriter.class);
          return Client.create(clientConfig);
      }
  }