/*
 * 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.knox.gateway.webappsec;

import static org.junit.Assert.fail;

import java.io.IOException;
import java.util.Collection;
import java.util.Enumeration;
import java.util.Properties;
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 org.apache.knox.gateway.webappsec.filter.XFrameOptionsFilter;
import org.easymock.EasyMock;
import org.junit.Assert;
import org.junit.Test;

public class XFrameOptionsFilterTest {
  private static final String X_FRAME_OPTIONS = "X-Frame-Options";
  String options;
  Collection<String> headerNames;
  Collection<String> headers;

  @Test
  public void testDefaultOptionsValue() throws Exception {
    try {
      XFrameOptionsFilter filter = new XFrameOptionsFilter();
      Properties props = new Properties();
      props.put("xframe.options.enabled", "true");
      filter.init(new TestFilterConfig(props));

      HttpServletRequest request = EasyMock.createNiceMock(
          HttpServletRequest.class);
      HttpServletResponse response = EasyMock.createNiceMock(
          HttpServletResponse.class);
      EasyMock.replay(request);
      EasyMock.replay(response);

      TestFilterChain chain = new TestFilterChain();
      filter.doFilter(request, response, chain);
      Assert.assertTrue("doFilterCalled should not be false.",
          chain.doFilterCalled );
      Assert.assertEquals("Options value incorrect should be DENY but is: "
                              + options, "DENY", options);

      Assert.assertEquals("X-Frame-Options count not equal to 1.", 1, headers.size());
    } catch (ServletException se) {
      fail("Should NOT have thrown a ServletException.");
    }
  }

  @Test
  public void testConfiguredOptionsValue() throws Exception {
    try {
      XFrameOptionsFilter filter = new XFrameOptionsFilter();
      Properties props = new Properties();
      props.put("xframe.options.enabled", "true");
      props.put("xframe.options", "SAMEORIGIN");
      filter.init(new TestFilterConfig(props));

      HttpServletRequest request = EasyMock.createNiceMock(
          HttpServletRequest.class);
      HttpServletResponse response = EasyMock.createNiceMock(
          HttpServletResponse.class);
      EasyMock.replay(request);
      EasyMock.replay(response);

      TestFilterChain chain = new TestFilterChain();
      filter.doFilter(request, response, chain);
      Assert.assertTrue("doFilterCalled should not be false.",
          chain.doFilterCalled );
      Assert.assertEquals("Options value incorrect should be SAMEORIGIN but is: "
                              + options, "SAMEORIGIN", options);

      Assert.assertEquals("X-Frame-Options count not equal to 1.", 1, headers.size());
    } catch (ServletException se) {
      fail("Should NOT have thrown a ServletException.");
    }
  }

//  @Test
//  public void testExistingXFrameOptionHeader() throws Exception {
//    try {
//      XFrameOptionsFilter filter = new XFrameOptionsFilter();
//      Properties props = new Properties();
//      props.put("xframe.options.enabled", "true");
//      props.put("xframe.options", "SAMEORIGIN");
//      filter.init(new TestFilterConfig(props));
//
//      HttpServletRequest request = EasyMock.createNiceMock(
//          HttpServletRequest.class);
//      HttpServletResponse response = EasyMock.createNiceMock(
//          HttpServletResponse.class);
//      EasyMock.replay(request);
//      EasyMock.replay(response);
//
//      TestFilterChain chain = new TestFilterChain();
//      filter.doFilter(request, response, chain);
//      Assert.assertTrue("doFilterCalled should not be false.",
//          chain.doFilterCalled );
//      Assert.assertTrue("Options value incorrect should be SAMEORIGIN but is: "
//          + options, "SAMEORIGIN".equals(options));
//
//      Assert.assertTrue("X-Frame-Options count not equal to 1.", headers.size() == 1);
//    } catch (ServletException se) {
//      fail("Should NOT have thrown a ServletException.");
//    }
//  }

  class TestFilterConfig implements FilterConfig {
    Properties props;

    TestFilterConfig(Properties props) {
      this.props = props;
    }

    @Override
    public String getFilterName() {
      return null;
    }

    @Override
    public ServletContext getServletContext() {
      return null;
    }

    @Override
    public String getInitParameter(String name) {
      return props.getProperty(name, null);
    }

    @Override
    public Enumeration<String> getInitParameterNames() {
      return null;
    }
  }

  class TestFilterChain implements FilterChain {
    boolean doFilterCalled;

    @Override
    public void doFilter(ServletRequest request, ServletResponse response)
        throws IOException, ServletException {
      doFilterCalled = true;
      options = ((HttpServletResponse)response).getHeader(X_FRAME_OPTIONS);
      headerNames = ((HttpServletResponse)response).getHeaderNames();
      headers = ((HttpServletResponse)response).getHeaders(X_FRAME_OPTIONS);
    }
  }
}