org.springframework.util.CheckUtils Maven / Gradle / Ivy

package org.springframework.util;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.HttpURLConnection;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.Proxy.Type;
import java.net.Socket;
import java.net.URL;
import java.net.URLConnection;
import java.nio.charset.StandardCharsets;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLSession;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.X509TrustManager;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.http.client.ClientHttpRequestFactoryCustom;

public final class CheckUtils {
  private static final Log logger = LogFactory.getLog(CheckUtils.class);
  private static final String DEFAULT_PROTOCOL = "TLS";
  public static final HostnameVerifier HOSTNAME_VERIFIER = ClientHttpRequestFactoryCustom.createHostnameVerifier();
  public static final SSLSocketFactory SSL_SOCKET_FACTORY = ClientHttpRequestFactoryCustom.createSSLContext(DEFAULT_PROTOCOL).getSocketFactory();

  /**
   * @param type ({@code DIRECT}, {@code HTTP}, {@code SOCKS})
   */
  public static Proxy createProxy(Type type, String host, int port) {
    return new Proxy(type, InetSocketAddress.createUnresolved(host, port));
  }

  public static boolean isReachable(String hostname, int port, int timeout) {
    try (Socket socket = new Socket()) {
      socket.connect(new InetSocketAddress(hostname, port), timeout);
      return true;
    }
    catch (IOException e) {
      // logger.debug("Not reachable... from {}:{} ({})", hostname, port, e.getMessage());
      return false;
    }
  }

  /**
   * {@code -Dsun.net.client.defaultConnectTimeout=1000}
   * 
   * {@code -Dsun.net.client.defaultReadTimeout=1000}
   * 
   * @see java.net.InetAddress#getByName(String)
   * @see java.net.InetAddress#isReachable(java.net.NetworkInterface, int, int)
   * @see java.net.NetworkInterface#getByInetAddress(InetAddress)
   * @see java.net.InetSocketAddress#InetSocketAddress(String, int)
   * @see java.net.Socket#connect(java.net.SocketAddress, int)
   * @see javax.net.ssl.SSLSocketFactory#getDefault()
   * @see javax.net.ssl.SSLSocketFactory#createSocket(String, int)
   * @see java.net.Socket#setSoTimeout(int)
   * @see java.net.Socket#isConnected()
   * @see java.net.HttpURLConnection#getErrorStream()
   */
  public static boolean isReachable(URL url) {
    URLConnection urlConnection = null;

    // try {
    // HttpURLConnection httpURLConnection = (urlConnection = url.openConnection())
    // instanceof HttpURLConnection ? (HttpURLConnection) urlConnection : null;
    // }
    // catch (IOException e1) {
    // }
    // try {
    // urlConnection = url.openConnection();
    // }
    // catch (IOException e) {
    // return false;
    // }
    // new AutoCloseableHttpURLConnection(httpURLConnection);
    try (Reader reader = new InputStreamReader((urlConnection = url.openConnection()).getInputStream(), StandardCharsets.UTF_8)) {
      return true;
    }
    catch (IOException e) {
      // logger.debug("Not Reachable... from {} ({})", url, e.getMessage());
      return false;
    }
    finally {
      if (urlConnection instanceof HttpURLConnection) {
        ((HttpURLConnection) urlConnection).disconnect();
      }
    }
  }

  // public static boolean isReachablsse(URL url) {
  // HttpURLConnection httpURLConnection = null;
  //
  // URLConnection urlConnection = url.openConnection();
  //
  // try (Reader reader = new InputStreamReader((httpURLConnection =
  // url.openConnection()).getInputStream(), StandardCharsets.UTF_8)) {
  // return true;
  // }
  // catch (IOException e) {
  // log.debug("Not Reachable... from {} ({})", url, e.getMessage());
  // return false;
  // }
  // finally {
  // if (httpURLConnection instanceof HttpURLConnection) {
  // ((HttpURLConnection) httpURLConnection).disconnect();
  // }
  // }
  // }

  /**
   * @see org.springframework.util.StreamUtils#drain(InputStream)
   */
  public static InputStream getInputStream(HttpURLConnection connection) throws IOException {
    InputStream inputStream = connection.getErrorStream();
    return (inputStream == null ? connection.getInputStream() : inputStream);
  }

  /**
   * {@code -Djavax.net.ssl.debug=all}
   */
  public static Collection getCertificates(URL url, int timeout) {
    try {
      URLConnection urlConnection = url.openConnection();
      if (urlConnection instanceof HttpsURLConnection) {
        HttpsURLConnection httpsURLConnection = (HttpsURLConnection) urlConnection;
        httpsURLConnection.setSSLSocketFactory(SSL_SOCKET_FACTORY);
        httpsURLConnection.setHostnameVerifier(HOSTNAME_VERIFIER);
        try {
          httpsURLConnection.connect();
        }
        finally {
          if (httpsURLConnection != null) {
            httpsURLConnection.disconnect();
          }
        }
        return Arrays.asList(httpsURLConnection.getServerCertificates());
      }
    }
    catch (IOException e) {
      // logger.warn("Connection fail... from {} {}", url, e.getMessage());
      // logger.trace("Connection fail... from {}", url, e);
    }
    return Collections.emptySet();
  }
}

/**
 * @see javax.net.ssl.TrustManagerFactory#getInstance(String)
 * @see javax.net.ssl.TrustManagerFactory#getDefaultAlgorithm()
 * @see java.security.KeyStore#getInstance(String)
 * @see java.security.KeyStore#getDefaultType()
 * @see javax.net.ssl.TrustManagerFactory#init(java.security.KeyStore)
 * @see javax.net.ssl.TrustManagerFactory#getTrustManagers()
 */
class TrustManagerImpl implements X509TrustManager {
  @Override
  public X509Certificate[] getAcceptedIssuers() {
    return null;
  }

  @Override
  public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
  }

  @Override
  public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
  }
}

class HostnameVerifierImpl implements HostnameVerifier {
  @Override
  public boolean verify(String hostname, SSLSession session) {
    return true;
  }
}