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org.apache.camel.component.mail.SplitAttachmentsExpression Maven / Gradle / Ivy

/*
 * 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.ByteArrayOutputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.camel.CamelContext;
import org.apache.camel.Exchange;
import org.apache.camel.Message;
import org.apache.camel.RuntimeCamelException;
import org.apache.camel.attachment.Attachment;
import org.apache.camel.attachment.AttachmentMessage;
import org.apache.camel.support.DefaultMessage;
import org.apache.camel.support.ExpressionAdapter;
import org.apache.camel.util.IOHelper;

/**
 * A {@link org.apache.camel.Expression} which can be used to split a {@link MailMessage} per attachment. For example if
 * a mail message has 5 attachments, then this expression will return a List<Message> that contains 5
 * {@link Message}. The message is split:
 * 
 * 
 * 
 * 
 * 
 * 
As a byte[] or StringThe attachments are split into new messages as the body. This allows the split messages to be easily used by * other processors / routes, as many other camel components can work on the byte[] or String, e.g. it can be written to * disk using camel-file.
* * In both cases the attachment name is written to a the camel header "CamelSplitAttachmentId" */ public class SplitAttachmentsExpression extends ExpressionAdapter { public static final String HEADER_NAME = "CamelSplitAttachmentId"; public SplitAttachmentsExpression() { } @Override public Object evaluate(Exchange exchange) { // must use getAttachments to ensure attachments is initial populated if (!exchange.getIn(AttachmentMessage.class).hasAttachments()) { return null; } try { List answer = new ArrayList<>(); AttachmentMessage inMessage = exchange.getIn(AttachmentMessage.class); for (Map.Entry entry : inMessage.getAttachmentObjects().entrySet()) { Message attachmentMessage = extractAttachment(entry.getValue(), entry.getKey(), exchange.getContext()); if (attachmentMessage != null) { answer.add(attachmentMessage); } } // clear attachments on original message after we have split them inMessage.getAttachmentObjects().clear(); return answer; } catch (Exception e) { throw new RuntimeCamelException("Unable to split attachments from MimeMultipart message", e); } } private Message extractAttachment(Attachment attachment, String attachmentName, CamelContext camelContext) throws Exception { final Message outMessage = new DefaultMessage(camelContext); outMessage.setHeader(HEADER_NAME, attachmentName); Object obj = attachment.getDataHandler().getContent(); if (obj instanceof InputStream) { outMessage.setBody(readMimePart((InputStream) obj)); return outMessage; } else if (obj instanceof String || obj instanceof byte[]) { outMessage.setBody(obj); return outMessage; } else { return null; } } private byte[] readMimePart(InputStream mimePartStream) throws Exception { // mimePartStream could be base64 encoded, or not, but we don't need to worry about it as // Camel is smart enough to wrap it in a decoder stream (eg Base64DecoderStream) when required ByteArrayOutputStream bos = new ByteArrayOutputStream(); IOHelper.copyAndCloseInput(mimePartStream, bos); return bos.toByteArray(); } }




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