/**

  * Copyright (c) 2014-2017, 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.email;

 import com.jcabi.aspects.Immutable;

 import com.jcabi.aspects.Loggable;

 import java.util.Map;

 import java.util.Properties;

 import javax.mail.Authenticator;

 import javax.mail.PasswordAuthentication;

 import javax.mail.Session;

 import lombok.EqualsAndHashCode;

 import lombok.ToString;

 /**

  * User signature to network node.

  *

  * <p>This is how you're supposed to use it:

  *

  * <pre> Postman postman = new Postman.Default(

  *   new SMTP(

  *     new Token("user", "password").access(

  *       new Protocol.SMTP("bind", "port")

  *     )

  *   )

  * );

  * </pre>

  *

  * @author Piotr Kotlicki (piotr.kotlicki@gmail.com)

  * @version $Id: ee6d6345243a811cae1674d55c3c81b7a37d9624 $

  * @since 1.0

  */

 @Immutable

 @ToString

 @EqualsAndHashCode(of = {"user", "password"})

 @Loggable(Loggable.DEBUG)

 public final class Token {

     /**

      * User name with access.

      */

     private final transient String user;

     /**

      * User's password.

      */

     private final transient String password;

     /**

      * Public ctor.

      * @param usr User name with access

      * @param pwd User's password

      */

     public Token(final String usr, final String pwd) {

         this.user = usr;

         this.password = pwd;

     }

     /**

      * Access for given protocol.

      * @param protocol Protocol.

      * @return Session.

      */

     public Session access(final Protocol protocol) {

         final Properties props = new Properties();

         for (final Map.Entry<String, String> entry

             : protocol.entries().entrySet()) {

             props.setProperty(entry.getKey(), entry.getValue());

         }

         return Session.getInstance(

             props, new Token.Verification(this.user, this.password)

         );

     }

     /**

      * Authenticating credentials.

      */

     private static final class Verification extends Authenticator {

         /**

          * User name.

          */

         private final transient String user;

         /**

          * User password.

          */

         private final transient String password;

         /**

          * Public ctor.

          * @param usr User name

          * @param pwd User password

          */

         Verification(final String usr, final String pwd) {

             super();

             this.user = usr;

             this.password = pwd;

         }

         @Override

         public PasswordAuthentication getPasswordAuthentication() {

             return new PasswordAuthentication(this.user, this.password);

         }

     }

 }