/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements. See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You 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.
   */
  package org.apache.logging.log4j.core.net;
  
  import javax.mail.Message;
  import javax.mail.MessagingException;
  import javax.mail.Session;
  import javax.mail.internet.AddressException;
  import javax.mail.internet.InternetAddress;
  import javax.mail.internet.MimeMessage;
  
  import org.apache.logging.log4j.core.util.Constants;
  
  /**
   *  Helper class for SmtpManager.
   */
  public class MimeMessageBuilder {
      private final MimeMessage message;
  
      public MimeMessageBuilder(final Session session) {
          message = new MimeMessage(session);
      }
  
      public MimeMessageBuilder setFrom(final String from) throws MessagingException {
          final InternetAddress address = parseAddress(from);
  
          if (null != address) {
              message.setFrom(address);
          } else {
              try {
                  message.setFrom();
              } catch (final Exception ex) {
                  message.setFrom((InternetAddress) null);
              }
          }
          return this;
      }
  
      public MimeMessageBuilder setReplyTo(final String replyTo) throws MessagingException {
          final InternetAddress[] addresses = parseAddresses(replyTo);
  
          if (null != addresses) {
              message.setReplyTo(addresses);
          }
          return this;
      }
  
      public MimeMessageBuilder setRecipients(final Message.RecipientType recipientType, final String recipients)
          throws MessagingException {
          final InternetAddress[] addresses = parseAddresses(recipients);
  
          if (null != addresses) {
              message.setRecipients(recipientType, addresses);
          }
          return this;
      }
  
      public MimeMessageBuilder setSubject(final String subject) throws MessagingException {
          if (subject != null) {
              message.setSubject(subject, Constants.UTF_8.name());
          }
          return this;
      }
  
      public MimeMessage getMimeMessage() {
          return message;
      }
  
      private static InternetAddress parseAddress(final String address) throws AddressException {
          return address == null ? null : new InternetAddress(address);
      }
  
      private static InternetAddress[] parseAddresses(final String addresses) throws AddressException {
          return addresses == null ? null : InternetAddress.parse(addresses, true);
      }
  }