content: /*
   * 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.camel.component.mail;
  
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.text.ParseException;
  import java.text.SimpleDateFormat;
  import java.util.ArrayList;
  import java.util.Date;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import jakarta.mail.BodyPart;
  import jakarta.mail.Message;
  import jakarta.mail.MessagingException;
  import jakarta.mail.Multipart;
  import jakarta.mail.internet.MimeMultipart;
  import jakarta.mail.search.SearchTerm;
  
  import org.apache.camel.Converter;
  import org.apache.camel.Exchange;
  import org.apache.camel.TypeConverter;
  import org.apache.camel.spi.TypeConverterRegistry;
  import org.apache.camel.support.ExchangeHelper;
  import org.apache.camel.util.TimeUtils;
  import org.eclipse.angus.mail.imap.SortTerm;
  
  /**
   * JavaMail specific converters.
   */
  @Converter(generateLoader = true)
  public final class MailConverters {
  
      private static final String NOW_DATE_FORMAT = "yyyy-MM-dd HH:mm:SS";
      // the now syntax: "now-24h" or "now - 24h" = the last 24 hours etc.
      private static final Pattern NOW_PATTERN = Pattern.compile("now\\s?(\\+|\\-)\\s?(.*)");
  
      private MailConverters() {
          //Utility Class
      }
  
      /**
       * Converts the given JavaMail message to a String body. Can return null.
       */
      @Converter
      public static String toString(Message message) throws MessagingException, IOException {
          Object content = message.getContent();
          while (content instanceof MimeMultipart) {
              MimeMultipart multipart = (MimeMultipart) content;
              if (multipart.getCount() > 0) {
                  BodyPart part = multipart.getBodyPart(0);
                  content = part.getContent();
              }
          }
          if (content != null) {
              return content.toString();
          }
          return null;
      }
  
      /**
       * Converts the given JavaMail multipart to a String body, where the content-type of the multipart must be text
       * based (ie start with text). Can return null.
       */
      @Converter
      public static String toString(Multipart multipart) throws MessagingException, IOException {
          try {
              int size = multipart.getCount();
              for (int i = 0; i < size; i++) {
                  BodyPart part = multipart.getBodyPart(i);
                  Object content = part.getContent();
                  while (content instanceof MimeMultipart) {
                      if (multipart.getCount() < 1) {
                          break;
                      }
                      part = ((MimeMultipart) content).getBodyPart(0);
                      content = part.getContent();
                  }
                  // Perform a case-insensitive "startsWith" check that works for different locales
                  String prefix = "text";
                  if (part.getContentType().regionMatches(true, 0, prefix, 0, prefix.length())) {
                      return part.getContent().toString();
                  }
              }
          } catch (MessagingException e) {
              Throwable cause = e.getCause();
              if (cause != null && "Folder is not Open".equals(cause.getMessage())) {
                  // ignore if folder is not open and we cannot read the mail
              } else {
                  throw e;
              }
          }
          return null;
      }
  
      /**
       * Converts the given JavaMail message to an InputStream.
       */
      @Converter
      public static InputStream toInputStream(Message message) throws IOException, MessagingException {
          return message.getInputStream();
      }
  
      /**
       * Converts the given JavaMail multipart to a InputStream body, where the content-type of the multipart must be text
       * based (ie start with text). Can return null.
       */
      @Converter
      public static InputStream toInputStream(Multipart multipart, Exchange exchange) throws IOException, MessagingException {
          String s = toString(multipart);
          if (s == null) {
              return null;
          }
          return new ByteArrayInputStream(s.getBytes(ExchangeHelper.getCharsetName(exchange)));
      }
  
      /**
       * Converts a JavaMail multipart into a body of any type a String can be converted into. The content-type of the
       * part must be text based.
       */
      @Converter(fallback = true)
      public static <T> T convertTo(Class<T> type, Exchange exchange, Object value, TypeConverterRegistry registry)
              throws MessagingException, IOException {
          if (Multipart.class.isAssignableFrom(value.getClass())) {
              TypeConverter tc = registry.lookup(type, String.class);
              if (tc != null) {
                  String s = toString((Multipart) value);
                  if (s != null) {
                      return tc.convertTo(type, s);
                  }
              }
          }
          return null;
      }
  
      /**
       * Converters the simple search term builder to search term.
       *
       * This should not be a @Converter method
       */
      public static SearchTerm toSearchTerm(SimpleSearchTerm simple) throws ParseException {
          SearchTermBuilder builder = new SearchTermBuilder();
          if (simple.isUnseen()) {
              builder = builder.unseen();
          }
  
          if (simple.getSubjectOrBody() != null) {
              String text = simple.getSubjectOrBody();
              SearchTermBuilder builderTemp = new SearchTermBuilder();
              builderTemp = builderTemp.subject(text).body(SearchTermBuilder.Op.or, text);
              builder = builder.and(builderTemp.build());
          }
          if (simple.getSubject() != null) {
              builder = builder.subject(simple.getSubject());
          }
          if (simple.getBody() != null) {
              builder = builder.body(simple.getBody());
          }
          if (simple.getFrom() != null) {
              builder = builder.from(simple.getFrom());
          }
          if (simple.getTo() != null) {
              builder = builder.recipient(Message.RecipientType.TO, simple.getTo());
          }
          if (simple.getFromSentDate() != null) {
              String s = simple.getFromSentDate();
              if (s.startsWith("now")) {
                  long offset = extractOffset(s);
                  builder = builder.and(new NowSearchTerm(SearchTermBuilder.Comparison.GE.asNum(), true, offset));
              } else {
                  SimpleDateFormat sdf = new SimpleDateFormat(NOW_DATE_FORMAT);
                  Date date = sdf.parse(s);
                  builder = builder.sent(SearchTermBuilder.Comparison.GE, date);
              }
          }
          if (simple.getToSentDate() != null) {
              String s = simple.getToSentDate();
              if (s.startsWith("now")) {
                  long offset = extractOffset(s);
                  builder = builder.and(new NowSearchTerm(SearchTermBuilder.Comparison.LE.asNum(), true, offset));
              } else {
                  SimpleDateFormat sdf = new SimpleDateFormat(NOW_DATE_FORMAT);
                  Date date = sdf.parse(s);
                  builder = builder.sent(SearchTermBuilder.Comparison.LE, date);
              }
          }
          if (simple.getFromReceivedDate() != null) {
              String s = simple.getFromReceivedDate();
              if (s.startsWith("now")) {
                  long offset = extractOffset(s);
                  builder = builder.and(new NowSearchTerm(SearchTermBuilder.Comparison.GE.asNum(), false, offset));
              } else {
                  SimpleDateFormat sdf = new SimpleDateFormat(NOW_DATE_FORMAT);
                  Date date = sdf.parse(s);
                  builder = builder.received(SearchTermBuilder.Comparison.GE, date);
              }
          }
          if (simple.getToReceivedDate() != null) {
              String s = simple.getToReceivedDate();
              if (s.startsWith("now")) {
                  long offset = extractOffset(s);
                  builder = builder.and(new NowSearchTerm(SearchTermBuilder.Comparison.LE.asNum(), false, offset));
              } else {
                  SimpleDateFormat sdf = new SimpleDateFormat(NOW_DATE_FORMAT);
                  Date date = sdf.parse(s);
                  builder = builder.received(SearchTermBuilder.Comparison.LE, date);
              }
          }
  
          return builder.build();
      }
  
      /*
       * Converts from comma separated list of sort terms to SortTerm obj array.
       * This should not be a @Converter method
       */
      public static SortTerm[] toSortTerm(String sortTerm) {
          ArrayList<SortTerm> result = new ArrayList<>();
  
          if (sortTerm == null) {
              return null;
          }
  
          String[] sortTerms = sortTerm.split(",");
          for (String key : sortTerms) {
              if ("arrival".equals(key)) {
                  result.add(SortTerm.ARRIVAL);
              } else if ("cc".equals(key)) {
                  result.add(SortTerm.CC);
              } else if ("date".equals(key)) {
                  result.add(SortTerm.DATE);
              } else if ("from".equals(key)) {
                  result.add(SortTerm.FROM);
              } else if ("reverse".equals(key)) {
                  result.add(SortTerm.REVERSE);
              } else if ("size".equals(key)) {
                  result.add(SortTerm.SIZE);
              } else if ("subject".equals(key)) {
                  result.add(SortTerm.SUBJECT);
              } else if ("to".equals(key)) {
                  result.add(SortTerm.TO);
              }
          }
          if (!result.isEmpty()) {
              return result.toArray(new SortTerm[0]);
          } else {
              return null;
          }
      }
  
      private static long extractOffset(String now) {
          Matcher matcher = NOW_PATTERN.matcher(now);
          if (matcher.matches()) {
              String op = matcher.group(1);
              String remainder = matcher.group(2);
  
              // convert remainder to a time millis (eg we have a String -> long converter that supports
              // syntax with hours, days, minutes: eg 5h30m for 5 hours and 30 minutes).
              long offset = TimeUtils.toMilliSeconds(remainder);
  
              if ("+".equals(op)) {
                  return offset;
              } else {
                  return -1 * offset;
              }
          }
  
          return 0;
      }
  
  }
  