/**

  * Copyright (c) 2011-2017, jcabi.com

  * All rights reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions

  * are met: 1) Redistributions of source code must retain the above

  * copyright notice, this list of conditions and the following

  * disclaimer. 2) Redistributions in binary form must reproduce the above

  * copyright notice, this list of conditions and the following

  * disclaimer in the documentation and/or other materials provided

  * with the distribution. 3) Neither the name of the jcabi.com nor

  * the names of its contributors may be used to endorse or promote

  * products derived from this software without specific prior written

  * permission.

  *

  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT

  * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND

  * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL

  * THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,

  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

  * OF THE POSSIBILITY OF SUCH DAMAGE.

  */

 package com.jcabi.http.wire;

 import com.jcabi.aspects.Immutable;

 import com.jcabi.http.ImmutableHeader;

 import com.jcabi.http.Request;

 import com.jcabi.http.Response;

 import com.jcabi.http.Wire;

 import com.jcabi.log.Logger;

 import java.io.IOException;

 import java.io.InputStream;

 import java.net.URI;

 import java.nio.charset.Charset;

 import java.util.Collection;

 import java.util.LinkedList;

 import java.util.Map;

 import javax.ws.rs.core.HttpHeaders;

 import javax.xml.bind.DatatypeConverter;

 import lombok.EqualsAndHashCode;

 import lombok.ToString;

 /**

  * Wire with HTTP basic authentication based on user info of URI.

  *

  * <p>This wire converts user info from URI into

  * {@code "Authorization"} HTTP header, for example:

  *

  * <pre> String html = new JdkRequest("http://jeff:12345@example.com")

  *   .through(BasicAuthWire.class)

  *   .fetch()

  *   .body();</pre>

  *

  * <p>In this example, an additional HTTP header {@code Authorization}

  * will be added with a value {@code Basic amVmZjoxMjM0NQ==}.

  *

  * <p>The class is immutable and thread-safe.

  *

  * @author Yegor Bugayenko (yegor@tpc2.com)

  * @version $Id: 9655873db4b9f4d3f8066c1445005df793072a6d $

  * @since 0.10

  * @see <a href="http://tools.ietf.org/html/rfc2617">RFC 2617 "HTTP Authentication: Basic and Digest Access Authentication"</a>

  */

 @Immutable

 @ToString(of = "origin")

 @EqualsAndHashCode(of = "origin")

 public final class BasicAuthWire implements Wire {

     /**

      * The encoding to use.

      */

     private static final String ENCODING = "UTF-8";

     /**

      * The Charset to use.

      */

     private static final Charset CHARSET =

         Charset.forName(BasicAuthWire.ENCODING);

     /**

      * Original wire.

      */

     private final transient Wire origin;

     /**

      * Public ctor.

      * @param wire Original wire

      */

     public BasicAuthWire(final Wire wire) {

         this.origin = wire;

     }

     // @checkstyle ParameterNumber (7 lines)

     @Override

     public Response send(final Request req, final String home,

         final String method,

         final Collection<Map.Entry<String, String>> headers,

         final InputStream content,

         final int connect,

         final int read) throws IOException {

         final Collection<Map.Entry<String, String>> hdrs =

             new LinkedList<Map.Entry<String, String>>();

         boolean absent = true;

         for (final Map.Entry<String, String> header : headers) {

             if (header.getKey().equals(HttpHeaders.AUTHORIZATION)) {

                 absent = false;

             }

             hdrs.add(header);

         }

         final String info = URI.create(home).getUserInfo();

         if (absent && info != null) {

             final String[] parts = info.split(":", 2);

             hdrs.add(

                 new ImmutableHeader(

                     HttpHeaders.AUTHORIZATION,

                     Logger.format(

                         "Basic %s",

                         DatatypeConverter.printBase64Binary(

                             Logger.format(

                                 "%s:%s",

                                 parts[0],

                                 parts[1]

                             ).getBytes(BasicAuthWire.CHARSET)

                         )

                     )

                 )

             );

         }

         return this.origin.send(

             req, home, method, hdrs, content, connect, read

         );

     }

 }