/*
* 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.sling.mailarchiveserver.impl;
import java.io.IOException;
import java.util.Set;
import org.apache.commons.io.IOUtils;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Service;
import org.apache.james.mime4j.dom.BinaryBody;
import org.apache.james.mime4j.dom.Body;
import org.apache.james.mime4j.dom.TextBody;
import org.apache.james.mime4j.message.BodyPart;
import org.apache.sling.mailarchiveserver.api.AttachmentFilter;
@Component
@Service(AttachmentFilter.class)
public class AttachmentFilterImpl implements AttachmentFilter {
private Set<String> eligibleExtensions = null;
private long maxSize = (long) 5e6; // 5 Mb
@Override
public boolean isEligible(BodyPart attachment) {
// extension check
final String filename = attachment.getFilename();
String ext = "";
int idx = filename.lastIndexOf('.');
if (idx > -1) {
ext = filename.substring(idx + 1);
}
if (eligibleExtensions != null && !eligibleExtensions.contains(ext)) {
return false;
}
// size check
final Body body = attachment.getBody();
try {
if (
body instanceof BinaryBody
&& IOUtils.toByteArray(((BinaryBody) body).getInputStream()).length > maxSize
||
body instanceof TextBody
&& IOUtils.toByteArray(((TextBody) body).getInputStream()).length > maxSize ) {
return false;
}
} catch (IOException e) {
return false;
}
// true, if nothing wrong
return true;
}
}