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/**
 * Licensed to The Apereo Foundation under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 *
 * The Apereo Foundation licenses this file to you under the Educational
 * Community 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://opensource.org/licenses/ecl2.txt
 *
 * 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.opencastproject.kernel.http.impl;

import org.opencastproject.kernel.http.api.HttpClient;

import org.apache.http.HttpResponse;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.conn.ssl.X509HostnameVerifier;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.HttpParams;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLException;
import javax.net.ssl.SSLSession;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

/** Implementation of HttpClient that makes http requests. */
public class HttpClientImpl implements HttpClient {

  /** The logging facility */
  private static final Logger logger = LoggerFactory.getLogger(HttpClientImpl.class);

  /** client used for all http requests. */
  private DefaultHttpClient defaultHttpClient = makeHttpClient();

  /** See org.opencastproject.kernel.http.api.HttpClient */
  @Override
  public HttpParams getParams() {
    return defaultHttpClient.getParams();
  }

  /** See org.opencastproject.kernel.http.api.HttpClient */
  @Override
  public CredentialsProvider getCredentialsProvider() {
    return defaultHttpClient.getCredentialsProvider();
  }

  /** See org.opencastproject.kernel.http.api.HttpClient */
  @Override
  public HttpResponse execute(HttpUriRequest httpUriRequest) throws IOException {
    return defaultHttpClient.execute(httpUriRequest);
  }

  /** See org.opencastproject.kernel.http.api.HttpClient */
  @Override
  public ClientConnectionManager getConnectionManager() {
    return defaultHttpClient.getConnectionManager();
  }

  /**
   * Creates a new client that can deal with all kinds of oddities with regards to http/https connections.
   *
   * @return the client
   */
  private DefaultHttpClient makeHttpClient() {

    DefaultHttpClient defaultHttpClient = new DefaultHttpClient();
    try {
      logger.debug("Installing forgiving hostname verifier and trust managers");
      X509TrustManager trustManager = createTrustManager();
      X509HostnameVerifier hostNameVerifier = createHostNameVerifier();
      SSLContext sslContext = SSLContext.getInstance("TLS");
      sslContext.init(null, new TrustManager[] { trustManager }, new SecureRandom());
      SSLSocketFactory ssf = new SSLSocketFactory(sslContext, hostNameVerifier);
      ClientConnectionManager ccm = defaultHttpClient.getConnectionManager();
      SchemeRegistry sr = ccm.getSchemeRegistry();
      sr.register(new Scheme("https", 443, ssf));
    } catch (NoSuchAlgorithmException e) {
      logger.error("Error creating context to handle TLS connections: {}", e.getMessage());
    } catch (KeyManagementException e) {
      logger.error("Error creating context to handle TLS connections: {}", e.getMessage());
    }

    return defaultHttpClient;
  }

  /**
   * Returns a new trust manager which will be in charge of checking the SSL certificates that are being presented by
   * SSL enabled hosts.
   *
   * @return the trust manager
   */
  private X509TrustManager createTrustManager() {
    X509TrustManager trustManager = new X509TrustManager() {

      /**
       * {@InheritDoc}
       *
       * @see javax.net.ssl.X509TrustManager#checkClientTrusted(java.security.cert.X509Certificate[], java.lang.String)
       */
      public void checkClientTrusted(X509Certificate[] xcs, String string) throws CertificateException {
        logger.trace("Skipping trust check on client certificate {}", string);
      }

      /**
       * {@InheritDoc}
       *
       * @see javax.net.ssl.X509TrustManager#checkServerTrusted(java.security.cert.X509Certificate[], java.lang.String)
       */
      public void checkServerTrusted(X509Certificate[] xcs, String string) throws CertificateException {
        logger.trace("Skipping trust check on server certificate {}", string);
      }

      /**
       * {@InheritDoc}
       *
       * @see javax.net.ssl.X509TrustManager#getAcceptedIssuers()
       */
      public X509Certificate[] getAcceptedIssuers() {
        logger.trace("Returning empty list of accepted issuers");
        return null;
      }

    };

    return trustManager;
  }

  /**
   * Creates a host name verifier that will make sure the SSL host's name matches the name in the SSL certificate.
   *
   * @return the host name verifier
   */
  private X509HostnameVerifier createHostNameVerifier() {
    X509HostnameVerifier verifier = new X509HostnameVerifier() {

      /**
       * {@InheritDoc}
       *
       * @see org.apache.http.conn.ssl.X509HostnameVerifier#verify(java.lang.String, javax.net.ssl.SSLSocket)
       */
      public void verify(String host, SSLSocket ssl) throws IOException {
        logger.trace("Skipping SSL host name check on {}", host);
      }

      /**
       * {@InheritDoc}
       *
       * @see org.apache.http.conn.ssl.X509HostnameVerifier#verify(java.lang.String, java.security.cert.X509Certificate)
       */
      public void verify(String host, X509Certificate xc) throws SSLException {
        logger.trace("Skipping X509 certificate host name check on {}", host);
      }

      /**
       * {@InheritDoc}
       *
       * @see org.apache.http.conn.ssl.X509HostnameVerifier#verify(java.lang.String, java.lang.String[],
       *      java.lang.String[])
       */
      public void verify(String host, String[] cns, String[] subjectAlts) throws SSLException {
        logger.trace("Skipping DNS host name check on {}", host);
      }

      /**
       * {@InheritDoc}
       *
       * @see javax.net.ssl.HostnameVerifier#verify(java.lang.String, javax.net.ssl.SSLSession)
       */
      public boolean verify(String host, SSLSession ssl) {
        logger.trace("Skipping SSL session host name check on {}", host);
        return true;
      }
    };

    return verifier;
  }

}