/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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 org.apache.hadoop.yarn.server.webproxy.amfilter;

import java.io.IOException;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.atomic.AtomicBoolean;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import junit.framework.Assert;

import org.junit.Test;
import org.mockito.Mockito;


public class TestAmFilter  {

  private String proxyHost = "bogushost.com";
  private String proxyUri = "http://bogus";

  private class TestAmIpFilter extends AmIpFilter {

    private Set<String> proxyAddresses = null;

    protected Set<String> getProxyAddresses() {
      if(proxyAddresses == null) {
        proxyAddresses = new HashSet<String>();
      }
      proxyAddresses.add(proxyHost);
      return proxyAddresses;
    }
  }


  private static class DummyFilterConfig implements FilterConfig {
    final Map<String, String> map;


    DummyFilterConfig(Map<String,String> map) {
      this.map = map;
    }

    @Override
    public String getFilterName() {
      return "dummy";
    }
    @Override
    public String getInitParameter(String arg0) {
      return map.get(arg0);
    }
    @Override
    public Enumeration<String> getInitParameterNames() {
      return Collections.enumeration(map.keySet());
    }
    @Override
    public ServletContext getServletContext() {
      return null;
    }
  }


  @Test
  public void filterNullCookies() throws Exception {
    HttpServletRequest request = Mockito.mock(HttpServletRequest.class);

    Mockito.when(request.getCookies()).thenReturn(null);
    Mockito.when(request.getRemoteAddr()).thenReturn(proxyHost);

    HttpServletResponse response = Mockito.mock(HttpServletResponse.class);

    final AtomicBoolean invoked = new AtomicBoolean();

    FilterChain chain = new FilterChain() {
      @Override
      public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse)
        throws IOException, ServletException {
        invoked.set(true);
      }
    };

    Map<String, String> params = new HashMap<String, String>();
    params.put(AmIpFilter.PROXY_HOST, proxyHost);
    params.put(AmIpFilter.PROXY_URI_BASE, proxyUri);
    FilterConfig conf = new DummyFilterConfig(params);
    Filter filter = new TestAmIpFilter();
    filter.init(conf);
    filter.doFilter(request, response, chain);
    Assert.assertTrue(invoked.get());
    filter.destroy();
  }
}