/**
 * 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.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Map;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.http.FilterContainer;
import org.apache.hadoop.http.HttpConfig;
import org.apache.hadoop.net.NetUtils;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.hadoop.yarn.webapp.util.WebAppUtils;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNull;

/**
 * Test class for {@Link AmFilterInitializer}.
 */
public class TestAmFilterInitializer {

  @BeforeEach
  public void setUp() throws Exception {
    NetUtils.addStaticResolution("host1", "172.0.0.1");
    NetUtils.addStaticResolution("host2", "172.0.0.1");
    NetUtils.addStaticResolution("host3", "172.0.0.1");
    NetUtils.addStaticResolution("host4", "172.0.0.1");
    NetUtils.addStaticResolution("host5", "172.0.0.1");
    NetUtils.addStaticResolution("host6", "172.0.0.1");
  }

  @Test
  void testInitFilter() {
    // Check PROXY_ADDRESS
    MockFilterContainer con = new MockFilterContainer();
    Configuration conf = new Configuration(false);
    conf.set(YarnConfiguration.PROXY_ADDRESS, "host1:1000");
    AmFilterInitializer afi = new MockAmFilterInitializer();
    assertNull(con.givenParameters);
    afi.initFilter(con, conf);
    assertEquals(2, con.givenParameters.size());
    assertEquals("host1", con.givenParameters.get(AmIpFilter.PROXY_HOSTS));
    assertEquals("http://host1:1000/foo",
        con.givenParameters.get(AmIpFilter.PROXY_URI_BASES));
    assertNull(con.givenParameters.get(AmFilterInitializer.RM_HA_URLS));

    // Check a single RM_WEBAPP_ADDRESS
    con = new MockFilterContainer();
    conf = new Configuration(false);
    conf.set(YarnConfiguration.RM_WEBAPP_ADDRESS, "host2:2000");
    afi = new MockAmFilterInitializer();
    assertNull(con.givenParameters);
    afi.initFilter(con, conf);
    assertEquals(2, con.givenParameters.size());
    assertEquals("host2", con.givenParameters.get(AmIpFilter.PROXY_HOSTS));
    assertEquals("http://host2:2000/foo",
        con.givenParameters.get(AmIpFilter.PROXY_URI_BASES));
    assertNull(con.givenParameters.get(AmFilterInitializer.RM_HA_URLS));

    // Check multiple RM_WEBAPP_ADDRESSes (RM HA)
    con = new MockFilterContainer();
    conf = new Configuration(false);
    conf.setBoolean(YarnConfiguration.RM_HA_ENABLED, true);
    conf.set(YarnConfiguration.RM_HA_IDS, "rm1,rm2,rm3");
    conf.set(YarnConfiguration.RM_WEBAPP_ADDRESS + ".rm1", "host2:2000");
    conf.set(YarnConfiguration.RM_WEBAPP_ADDRESS + ".rm2", "host3:3000");
    conf.set(YarnConfiguration.RM_WEBAPP_ADDRESS + ".rm3", "host4:4000");
    afi = new MockAmFilterInitializer();
    assertNull(con.givenParameters);
    afi.initFilter(con, conf);
    assertEquals(3, con.givenParameters.size());
    String[] proxyHosts = con.givenParameters.get(AmIpFilter.PROXY_HOSTS)
        .split(AmIpFilter.PROXY_HOSTS_DELIMITER);
    assertEquals(3, proxyHosts.length);
    Arrays.sort(proxyHosts);
    assertEquals("host2", proxyHosts[0]);
    assertEquals("host3", proxyHosts[1]);
    assertEquals("host4", proxyHosts[2]);
    String[] proxyBases = con.givenParameters.get(AmIpFilter.PROXY_URI_BASES)
        .split(AmIpFilter.PROXY_URI_BASES_DELIMITER);
    assertEquals(3, proxyBases.length);
    Arrays.sort(proxyBases);
    assertEquals("http://host2:2000/foo", proxyBases[0]);
    assertEquals("http://host3:3000/foo", proxyBases[1]);
    assertEquals("http://host4:4000/foo", proxyBases[2]);
    assertEquals("host2:2000,host3:3000,host4:4000",
        con.givenParameters.get(AmFilterInitializer.RM_HA_URLS));

    // Check multiple RM_WEBAPP_ADDRESSes (RM HA) with HTTPS
    con = new MockFilterContainer();
    conf = new Configuration(false);
    conf.set(YarnConfiguration.YARN_HTTP_POLICY_KEY,
        HttpConfig.Policy.HTTPS_ONLY.toString());
    conf.setBoolean(YarnConfiguration.RM_HA_ENABLED, true);
    conf.set(YarnConfiguration.RM_HA_IDS, "rm1,rm2");
    conf.set(YarnConfiguration.RM_WEBAPP_HTTPS_ADDRESS + ".rm1", "host5:5000");
    conf.set(YarnConfiguration.RM_WEBAPP_HTTPS_ADDRESS + ".rm2", "host6:6000");
    afi = new MockAmFilterInitializer();
    assertNull(con.givenParameters);
    afi.initFilter(con, conf);
    assertEquals(3, con.givenParameters.size());
    proxyHosts = con.givenParameters.get(AmIpFilter.PROXY_HOSTS)
        .split(AmIpFilter.PROXY_HOSTS_DELIMITER);
    assertEquals(2, proxyHosts.length);
    Arrays.sort(proxyHosts);
    assertEquals("host5", proxyHosts[0]);
    assertEquals("host6", proxyHosts[1]);
    proxyBases = con.givenParameters.get(AmIpFilter.PROXY_URI_BASES)
        .split(AmIpFilter.PROXY_URI_BASES_DELIMITER);
    assertEquals(2, proxyBases.length);
    Arrays.sort(proxyBases);
    assertEquals("https://host5:5000/foo", proxyBases[0]);
    assertEquals("https://host6:6000/foo", proxyBases[1]);
    assertEquals("host5:5000,host6:6000",
        con.givenParameters.get(AmFilterInitializer.RM_HA_URLS));
  }

  @Test
  void testGetProxyHostsAndPortsForAmFilter() {

    // Check no configs given
    Configuration conf = new Configuration(false);
    List<String> proxyHosts =
        WebAppUtils.getProxyHostsAndPortsForAmFilter(conf);
    assertEquals(1, proxyHosts.size());
    assertEquals(WebAppUtils.getResolvedRMWebAppURLWithoutScheme(conf),
        proxyHosts.get(0));

    // Check conf in which only RM hostname is set
    conf = new Configuration(false);
    conf.set(YarnConfiguration.RM_WEBAPP_ADDRESS,
        "${yarn.resourcemanager.hostname}:8088"); // default in yarn-default.xml
    conf.set(YarnConfiguration.RM_HOSTNAME, "host1");
    proxyHosts = WebAppUtils.getProxyHostsAndPortsForAmFilter(conf);
    assertEquals(1, proxyHosts.size());
    assertEquals("host1:8088", proxyHosts.get(0));

    // Check PROXY_ADDRESS has priority
    conf = new Configuration(false);
    conf.set(YarnConfiguration.PROXY_ADDRESS, "host1:1000");
    conf.setBoolean(YarnConfiguration.RM_HA_ENABLED, true);
    conf.set(YarnConfiguration.RM_HA_IDS, "rm1,rm2,rm3");
    conf.set(YarnConfiguration.RM_WEBAPP_ADDRESS + ".rm1", "host2:2000");
    conf.set(YarnConfiguration.RM_WEBAPP_ADDRESS + ".rm2", "host3:3000");
    conf.set(YarnConfiguration.RM_WEBAPP_ADDRESS + ".rm3", "host4:4000");
    proxyHosts = WebAppUtils.getProxyHostsAndPortsForAmFilter(conf);
    assertEquals(1, proxyHosts.size());
    assertEquals("host1:1000", proxyHosts.get(0));

    // Check getting a single RM_WEBAPP_ADDRESS
    conf = new Configuration(false);
    conf.set(YarnConfiguration.RM_WEBAPP_ADDRESS, "host2:2000");
    proxyHosts = WebAppUtils.getProxyHostsAndPortsForAmFilter(conf);
    assertEquals(1, proxyHosts.size());
    Collections.sort(proxyHosts);
    assertEquals("host2:2000", proxyHosts.get(0));

    // Check getting multiple RM_WEBAPP_ADDRESSes (RM HA)
    conf = new Configuration(false);
    conf.setBoolean(YarnConfiguration.RM_HA_ENABLED, true);
    conf.set(YarnConfiguration.RM_HA_IDS, "rm1,rm2,rm3");
    conf.set(YarnConfiguration.RM_WEBAPP_ADDRESS + ".rm1", "host2:2000");
    conf.set(YarnConfiguration.RM_WEBAPP_ADDRESS + ".rm2", "host3:3000");
    conf.set(YarnConfiguration.RM_WEBAPP_ADDRESS + ".rm3", "host4:4000");
    conf.set(YarnConfiguration.RM_WEBAPP_ADDRESS + ".rm4", "dummy");
    conf.set(YarnConfiguration.RM_WEBAPP_HTTPS_ADDRESS + ".rm1", "host5:5000");
    conf.set(YarnConfiguration.RM_WEBAPP_HTTPS_ADDRESS + ".rm2", "host6:6000");
    proxyHosts = WebAppUtils.getProxyHostsAndPortsForAmFilter(conf);
    assertEquals(3, proxyHosts.size());
    Collections.sort(proxyHosts);
    assertEquals("host2:2000", proxyHosts.get(0));
    assertEquals("host3:3000", proxyHosts.get(1));
    assertEquals("host4:4000", proxyHosts.get(2));

    // Check getting multiple RM_WEBAPP_ADDRESSes (RM HA) with HTTPS
    conf = new Configuration(false);
    conf.set(YarnConfiguration.YARN_HTTP_POLICY_KEY,
        HttpConfig.Policy.HTTPS_ONLY.toString());
    conf.setBoolean(YarnConfiguration.RM_HA_ENABLED, true);
    conf.set(YarnConfiguration.RM_HA_IDS, "rm1,rm2,rm3,dummy");
    conf.set(YarnConfiguration.RM_WEBAPP_ADDRESS + ".rm1", "host2:2000");
    conf.set(YarnConfiguration.RM_WEBAPP_ADDRESS + ".rm2", "host3:3000");
    conf.set(YarnConfiguration.RM_WEBAPP_ADDRESS + ".rm3", "host4:4000");
    conf.set(YarnConfiguration.RM_WEBAPP_HTTPS_ADDRESS + ".rm1", "host5:5000");
    conf.set(YarnConfiguration.RM_WEBAPP_HTTPS_ADDRESS + ".rm2", "host6:6000");
    proxyHosts = WebAppUtils.getProxyHostsAndPortsForAmFilter(conf);
    assertEquals(2, proxyHosts.size());
    Collections.sort(proxyHosts);
    assertEquals("host5:5000", proxyHosts.get(0));
    assertEquals("host6:6000", proxyHosts.get(1));

    // Check config without explicit RM_WEBAPP_ADDRESS settings (RM HA)
    conf = new Configuration(false);
    conf.setBoolean(YarnConfiguration.RM_HA_ENABLED, true);
    conf.set(YarnConfiguration.RM_HA_IDS, "rm1,rm2,rm3");
    conf.set(YarnConfiguration.RM_HOSTNAME + ".rm1", "host2");
    conf.set(YarnConfiguration.RM_HOSTNAME + ".rm2", "host3");
    conf.set(YarnConfiguration.RM_HOSTNAME + ".rm3", "host4");
    conf.set(YarnConfiguration.RM_HOSTNAME + ".rm4", "dummy");
    proxyHosts = WebAppUtils.getProxyHostsAndPortsForAmFilter(conf);
    assertEquals(3, proxyHosts.size());
    Collections.sort(proxyHosts);
    assertEquals("host2:" + YarnConfiguration.DEFAULT_RM_WEBAPP_PORT,
        proxyHosts.get(0));
    assertEquals("host3:" + YarnConfiguration.DEFAULT_RM_WEBAPP_PORT,
        proxyHosts.get(1));
    assertEquals("host4:" + YarnConfiguration.DEFAULT_RM_WEBAPP_PORT,
        proxyHosts.get(2));

    // Check config without explicit RM_WEBAPP_HTTPS_ADDRESS settings (RM HA)
    conf = new Configuration(false);
    conf.set(YarnConfiguration.YARN_HTTP_POLICY_KEY,
        HttpConfig.Policy.HTTPS_ONLY.toString());
    conf.setBoolean(YarnConfiguration.RM_HA_ENABLED, true);
    conf.set(YarnConfiguration.RM_HA_IDS, "rm1,rm2,rm3");
    conf.set(YarnConfiguration.RM_HOSTNAME + ".rm1", "host2");
    conf.set(YarnConfiguration.RM_HOSTNAME + ".rm2", "host3");
    conf.set(YarnConfiguration.RM_HOSTNAME + ".rm3", "host4");
    conf.set(YarnConfiguration.RM_HOSTNAME + ".rm4", "dummy");
    proxyHosts = WebAppUtils.getProxyHostsAndPortsForAmFilter(conf);
    assertEquals(3, proxyHosts.size());
    Collections.sort(proxyHosts);
    assertEquals("host2:" + YarnConfiguration.DEFAULT_RM_WEBAPP_HTTPS_PORT,
        proxyHosts.get(0));
    assertEquals("host3:" + YarnConfiguration.DEFAULT_RM_WEBAPP_HTTPS_PORT,
        proxyHosts.get(1));
    assertEquals("host4:" + YarnConfiguration.DEFAULT_RM_WEBAPP_HTTPS_PORT,
        proxyHosts.get(2));
  }

  class MockAmFilterInitializer extends AmFilterInitializer {
    @Override
    protected String getApplicationWebProxyBase() {
      return "/foo";
    }
  }

  class MockFilterContainer implements FilterContainer {
    Map<String, String> givenParameters;

    @Override
    public void addFilter(String name, String classname, Map<String,
        String> parameters) {
      givenParameters = parameters;
    }

    @Override
    public void addGlobalFilter(String name, String classname,
        Map<String, String> parameters) {
    }
  }
}
