/**
 * Licensed 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. See accompanying LICENSE file.
 */
package org.apache.hadoop.security.authentication.client;

import org.apache.hadoop.minikdc.KerberosSecurityTestcase;
import org.apache.hadoop.security.authentication.KerberosTestUtils;
import org.apache.hadoop.security.authentication.server.AuthenticationFilter;
import org.apache.hadoop.security.authentication.server.PseudoAuthenticationHandler;
import org.apache.hadoop.security.authentication.server.KerberosAuthenticationHandler;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

import java.io.File;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Properties;
import java.util.concurrent.Callable;

public class TestKerberosAuthenticator extends KerberosSecurityTestcase {

  @Before
  public void setup() throws Exception {
    // create keytab
    File keytabFile = new File(KerberosTestUtils.getKeytabFile());
    String clientPrincipal = KerberosTestUtils.getClientPrincipal();
    String serverPrincipal = KerberosTestUtils.getServerPrincipal();
    clientPrincipal = clientPrincipal.substring(0, clientPrincipal.lastIndexOf("@"));
    serverPrincipal = serverPrincipal.substring(0, serverPrincipal.lastIndexOf("@"));
    getKdc().createPrincipal(keytabFile, clientPrincipal, serverPrincipal);
  }

  private Properties getAuthenticationHandlerConfiguration() {
    Properties props = new Properties();
    props.setProperty(AuthenticationFilter.AUTH_TYPE, "kerberos");
    props.setProperty(KerberosAuthenticationHandler.PRINCIPAL, KerberosTestUtils.getServerPrincipal());
    props.setProperty(KerberosAuthenticationHandler.KEYTAB, KerberosTestUtils.getKeytabFile());
    props.setProperty(KerberosAuthenticationHandler.NAME_RULES,
                      "RULE:[1:$1@$0](.*@" + KerberosTestUtils.getRealm()+")s/@.*//\n");
    return props;
  }

  @Test(timeout=60000)
  public void testFallbacktoPseudoAuthenticator() throws Exception {
    AuthenticatorTestCase auth = new AuthenticatorTestCase();
    Properties props = new Properties();
    props.setProperty(AuthenticationFilter.AUTH_TYPE, "simple");
    props.setProperty(PseudoAuthenticationHandler.ANONYMOUS_ALLOWED, "false");
    AuthenticatorTestCase.setAuthenticationHandlerConfig(props);
    auth._testAuthentication(new KerberosAuthenticator(), false);
  }

  @Test(timeout=60000)
  public void testFallbacktoPseudoAuthenticatorAnonymous() throws Exception {
    AuthenticatorTestCase auth = new AuthenticatorTestCase();
    Properties props = new Properties();
    props.setProperty(AuthenticationFilter.AUTH_TYPE, "simple");
    props.setProperty(PseudoAuthenticationHandler.ANONYMOUS_ALLOWED, "true");
    AuthenticatorTestCase.setAuthenticationHandlerConfig(props);
    auth._testAuthentication(new KerberosAuthenticator(), false);
  }

  @Test(timeout=60000)
  public void testNotAuthenticated() throws Exception {
    AuthenticatorTestCase auth = new AuthenticatorTestCase();
    AuthenticatorTestCase.setAuthenticationHandlerConfig(getAuthenticationHandlerConfiguration());
    auth.start();
    try {
      URL url = new URL(auth.getBaseURL());
      HttpURLConnection conn = (HttpURLConnection) url.openConnection();
      conn.connect();
      Assert.assertEquals(HttpURLConnection.HTTP_UNAUTHORIZED, conn.getResponseCode());
      Assert.assertTrue(conn.getHeaderField(KerberosAuthenticator.WWW_AUTHENTICATE) != null);
    } finally {
      auth.stop();
    }
  }

  @Test(timeout=60000)
  public void testAuthentication() throws Exception {
    final AuthenticatorTestCase auth = new AuthenticatorTestCase();
    AuthenticatorTestCase.setAuthenticationHandlerConfig(
            getAuthenticationHandlerConfiguration());
    KerberosTestUtils.doAsClient(new Callable<Void>() {
      @Override
      public Void call() throws Exception {
        auth._testAuthentication(new KerberosAuthenticator(), false);
        return null;
      }
    });
  }

  @Test(timeout=60000)
  public void testAuthenticationPost() throws Exception {
    final AuthenticatorTestCase auth = new AuthenticatorTestCase();
    AuthenticatorTestCase.setAuthenticationHandlerConfig(
            getAuthenticationHandlerConfiguration());
    KerberosTestUtils.doAsClient(new Callable<Void>() {
      @Override
      public Void call() throws Exception {
        auth._testAuthentication(new KerberosAuthenticator(), true);
        return null;
      }
    });
  }
}