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/*
 * Licensed to Metamarkets Group Inc. (Metamarkets) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Metamarkets licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package io.druid.security.kerberos;

import com.google.common.base.Throwables;
import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.SettableFuture;
import com.metamx.http.client.AbstractHttpClient;
import com.metamx.http.client.HttpClient;
import com.metamx.http.client.Request;
import com.metamx.http.client.response.HttpResponseHandler;
import io.druid.concurrent.Execs;
import io.druid.java.util.common.logger.Logger;
import org.apache.hadoop.security.UserGroupInformation;
import org.jboss.netty.handler.codec.http.HttpHeaders;
import org.joda.time.Duration;

import java.net.CookieManager;
import java.net.URI;
import java.security.PrivilegedExceptionAction;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Executor;

public class KerberosHttpClient extends AbstractHttpClient
{
  private static final Logger log = new Logger(KerberosHttpClient.class);

  private final HttpClient delegate;
  private final AuthenticationKerberosConfig config;
  private final CookieManager cookieManager;
  private final Executor exec = Execs.singleThreaded("test-%s");

  public KerberosHttpClient(HttpClient delegate, AuthenticationKerberosConfig config)
  {
    this.delegate = delegate;
    this.config = config;
    this.cookieManager = new CookieManager();
  }

  @Override
  public  ListenableFuture go(
    Request request, HttpResponseHandler httpResponseHandler, Duration duration
  )
  {
    final SettableFuture retVal = SettableFuture.create();
    inner_go(request, httpResponseHandler, duration, retVal);
    return retVal;
  }


  private  void inner_go(
    final Request request,
    final HttpResponseHandler httpResponseHandler,
    final Duration duration,
    final SettableFuture future
  )
  {
    try {
      final String host = request.getUrl().getHost();
      final URI uri = request.getUrl().toURI();


      Map> cookieMap = cookieManager.get(uri, Collections.>emptyMap());
      for (Map.Entry> entry : cookieMap.entrySet()) {
        request.addHeaderValues(entry.getKey(), entry.getValue());
      }
      final boolean should_retry_on_unauthorized_response;

      if (DruidKerberosUtil.needToSendCredentials(cookieManager.getCookieStore(), uri)) {
        // No Cookies for requested URI, authenticate user and add authentication header
        log.debug(
          "No Auth Cookie found for URI[%s]. Existing Cookies[%s] Authenticating... ",
          uri,
          cookieManager.getCookieStore().getCookies()
        );
        DruidKerberosUtil.authenticateIfRequired(config);
        UserGroupInformation currentUser = UserGroupInformation.getCurrentUser();
        String challenge = currentUser.doAs(new PrivilegedExceptionAction()
        {
          @Override
          public String run() throws Exception
          {
            return DruidKerberosUtil.kerberosChallenge(host);
          }
        });
        request.setHeader(HttpHeaders.Names.AUTHORIZATION, "Negotiate " + challenge);
        should_retry_on_unauthorized_response = false;
      } else {
        should_retry_on_unauthorized_response = true;
        log.debug("Found Auth Cookie found for URI[%s].", uri);
      }

      ListenableFuture> internalFuture = delegate.go(
        request,
        new RetryIfUnauthorizedResponseHandler(new ResponseCookieHandler(
          request.getUrl().toURI(),
          cookieManager,
          httpResponseHandler
        )),
        duration
      );

      Futures.addCallback(internalFuture, new FutureCallback>()
      {
        @Override
        public void onSuccess(RetryResponseHolder result)
        {
          if (should_retry_on_unauthorized_response && result.shouldRetry()) {
            log.info("Preparing for Retry");
            // remove Auth cookie
            DruidKerberosUtil.removeAuthCookie(cookieManager.getCookieStore(), uri);
            // clear existing cookie
            request.setHeader("Cookie", "");
            inner_go(request.copy(), httpResponseHandler, duration, future);
          } else {
            log.info("Not retrying and returning future response");
            future.set(result.getObj());
          }
        }

        @Override
        public void onFailure(Throwable t)
        {
          future.setException(t);
        }
      }, exec);
    }
    catch (Throwable e) {
      throw Throwables.propagate(e);
    }
  }

}