/**
 * 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.util;

import java.io.File;
import java.io.IOException;
import java.util.Arrays;

import org.apache.commons.io.FileUtils;
import org.apache.hadoop.util.FileBasedIPList;
import org.apache.hadoop.util.IPList;
import org.junit.After;
import org.junit.Test;

import junit.framework.TestCase;

public class TestFileBasedIPList extends TestCase {

  @After
  public void tearDown() {
    removeFile("ips.txt");
  }

  /**
   * Add a bunch of IPS  to the file
   * Check  for inclusion
   * Check for exclusion
   */
  @Test
  public void testSubnetsAndIPs() throws IOException {

    String[] ips = {"10.119.103.112", "10.221.102.0/23"};

    createFileWithEntries ("ips.txt", ips);

    IPList ipList = new FileBasedIPList("ips.txt");

    assertTrue ("10.119.103.112 is not in the list",
        ipList.isIn("10.119.103.112"));
    assertFalse ("10.119.103.113 is in the list",
        ipList.isIn("10.119.103.113"));

    assertTrue ("10.221.102.0 is not in the list",
        ipList.isIn("10.221.102.0"));
    assertTrue ("10.221.102.1 is not in the list",
        ipList.isIn("10.221.102.1"));
    assertTrue ("10.221.103.1 is not in the list",
        ipList.isIn("10.221.103.1"));
    assertTrue ("10.221.103.255 is not in the list",
        ipList.isIn("10.221.103.255"));
    assertFalse("10.221.104.0 is in the list",
        ipList.isIn("10.221.104.0"));
    assertFalse("10.221.104.1 is in the list",
        ipList.isIn("10.221.104.1"));
  }

  /**
   * Add a bunch of IPS  to the file
   * Check  for inclusion
   * Check for exclusion
   */
  @Test
  public void testNullIP() throws IOException {

    String[] ips = {"10.119.103.112", "10.221.102.0/23"};
    createFileWithEntries ("ips.txt", ips);

    IPList ipList = new FileBasedIPList("ips.txt");

    assertFalse ("Null Ip is in the list",
        ipList.isIn(null));
  }

  /**
   * Add a bunch of subnets and IPSs to the file
   * Check  for inclusion
   * Check for exclusion
   */
  @Test
  public void testWithMultipleSubnetAndIPs() throws IOException {

    String[] ips = {"10.119.103.112", "10.221.102.0/23", "10.222.0.0/16",
    "10.113.221.221"};

    createFileWithEntries ("ips.txt", ips);

    IPList ipList = new FileBasedIPList("ips.txt");

    assertTrue ("10.119.103.112 is not in the list",
        ipList.isIn("10.119.103.112"));
    assertFalse ("10.119.103.113 is in the list",
        ipList.isIn("10.119.103.113"));

    assertTrue ("10.221.103.121 is not in the list",
        ipList.isIn("10.221.103.121"));
    assertFalse("10.221.104.0 is in the list",
        ipList.isIn("10.221.104.0"));

    assertTrue ("10.222.103.121 is not in the list",
        ipList.isIn("10.222.103.121"));
    assertFalse("10.223.104.0 is in the list",
        ipList.isIn("10.223.104.0"));

    assertTrue ("10.113.221.221 is not in the list",
        ipList.isIn("10.113.221.221"));
    assertFalse("10.113.221.222 is in the list",
        ipList.isIn("10.113.221.222"));
  }

  /**
   * Do not specify the file
   * test for inclusion
   * should be true as if the feature is turned off
   */
  public void testFileNotSpecified() {

    IPList ipl = new FileBasedIPList(null);

    assertFalse("110.113.221.222 is in the list",
        ipl.isIn("110.113.221.222"));
  }

  /**
   * Specify a non existent file
   * test for inclusion
   * should be true as if the feature is turned off
   */
  public void testFileMissing() {

    IPList ipl = new FileBasedIPList("missingips.txt");

    assertFalse("110.113.221.222 is in the list",
        ipl.isIn("110.113.221.222"));
  }

  /**
   * Specify an existing file, but empty
   * test for inclusion
   * should be true as if the feature is turned off
   */
  public void testWithEmptyList() throws IOException {
    String[] ips = {};

    createFileWithEntries ("ips.txt", ips);
    IPList ipl = new FileBasedIPList("ips.txt");

    assertFalse("110.113.221.222 is in the list",
        ipl.isIn("110.113.221.222"));
  }

  /**
   * Specify an existing file, but ips in wrong format
   * test for inclusion
   * should be true as if the feature is turned off
   */
  public void testForBadFIle() throws IOException {
    String[] ips = { "10.221.102/23"};

    createFileWithEntries ("ips.txt", ips);

    try {
      new FileBasedIPList("ips.txt");
     fail();
     } catch (Exception e) {
       //expects Exception
     }
  }

  /**
   * Add a bunch of subnets and IPSs to the file. Keep one entry wrong.
   * The good entries will still be used.
   * Check  for inclusion with good entries
   * Check for exclusion
   */
  public void testWithAWrongEntry() throws IOException {

    String[] ips = {"10.119.103.112", "10.221.102/23", "10.221.204.1/23"};

    createFileWithEntries ("ips.txt", ips);

    try {
     new FileBasedIPList("ips.txt");
    fail();
    } catch (Exception e) {
      //expects Exception
    }
  }

  public static void createFileWithEntries(String fileName, String[] ips)
      throws IOException {
    FileUtils.writeLines(new File(fileName), Arrays.asList(ips));
  }

  public static void removeFile(String fileName) {
    File file  = new File(fileName);
    if (file.exists()) {
      new File(fileName).delete();
    }
  }
}