001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.activemq.blob;
018
019import java.io.IOException;
020import java.io.InputStream;
021import java.net.HttpURLConnection;
022import java.net.URL;
023import javax.jms.JMSException;
024import org.apache.activemq.command.ActiveMQBlobMessage;
025
026/**
027 * A default implementation of {@link BlobDownloadStrategy} which uses the URL
028 * class to download files or streams from a remote URL
029 */
030public class DefaultBlobDownloadStrategy extends DefaultStrategy implements BlobDownloadStrategy {
031
032    public DefaultBlobDownloadStrategy(BlobTransferPolicy transferPolicy) {
033        super(transferPolicy);
034    }
035
036    public InputStream getInputStream(ActiveMQBlobMessage message) throws IOException, JMSException {
037        URL value = message.getURL();
038        if (value == null) {
039            return null;
040        }
041
042        // Do some checks on the received URL against the transfer policy
043        URL uploadURL = new URL(super.transferPolicy.getUploadUrl());
044        String protocol = message.getURL().getProtocol();
045        if (!protocol.equals(uploadURL.getProtocol())) {
046            throw new IOException("The message URL protocol is incorrect");
047        }
048
049        String host = message.getURL().getHost();
050        if (!host.equals(uploadURL.getHost())) {
051            throw new IOException("The message URL host is incorrect");
052        }
053
054        int port = message.getURL().getPort();
055        if (uploadURL.getPort() != 0 && port != uploadURL.getPort()) {
056            throw new IOException("The message URL port is incorrect");
057        }
058
059        return value.openStream();
060    }
061
062    public void deleteFile(ActiveMQBlobMessage message) throws IOException, JMSException {
063        URL url = createMessageURL(message);
064
065        HttpURLConnection connection = (HttpURLConnection)url.openConnection();
066        connection.setRequestMethod("DELETE");
067        try {
068            connection.connect();
069        } catch (IOException e) {
070            throw new IOException("DELETE failed on: " + url, e);
071        } finally {
072            connection.disconnect();
073        }
074        if (!isSuccessfulCode(connection.getResponseCode())) {
075            throw new IOException("DELETE was not successful: " + connection.getResponseCode() + " "
076                                  + connection.getResponseMessage());
077        }
078    }
079
080}