src.org.jets3t.servlets.gatekeeper.impl.RenameToUuidUrlSigner Maven / Gradle / Ivy
/*
* jets3t : Java Extra-Tasty S3 Toolkit (for Amazon S3 online storage service)
* This is a java.net project, see https://jets3t.dev.java.net/
*
* Copyright 2006 James Murty
*
* Licensed 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.jets3t.servlets.gatekeeper.impl;
import java.util.Map;
import java.util.Properties;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jets3t.service.S3ServiceException;
import org.jets3t.service.utils.gatekeeper.GatekeeperMessage;
import org.jets3t.service.utils.gatekeeper.SignatureRequest;
/**
* UrlSigner implementation that extends the DefaultUrlSigner class to perform some additional
* work - speficically this class renames the S3 objects keys based on the transaction ID.
*
* @author James Murty
*/
public class RenameToUuidUrlSigner extends DefaultUrlSigner {
private final static Log log = LogFactory.getLog(RenameToUuidUrlSigner.class);
private String lastTransactionId = "";
private int countOfRenamedObjects = 0;
/**
* Constructs the UrlSigner with the required parameters.
*
* The required parameters that must be available in the servlet configuration are:
*
* - S3BucketName: The bucket all objects are stored in (regardless of what bucket
* name the client provided).
* - SecondsToSign: How many seconds until the signed URLs will expire
* Note: this setting must allow enough time for the operation to complete
* before the expiry time is reached. For example, if uploads are expected over slow
* connections the expiry time must be long enough for the uploads to finish otherwise the
* uploaded file will be rejected after it has finished uploading.
*
*
* @param servletConfig
* @throws ServletException
*/
public RenameToUuidUrlSigner(ServletConfig servletConfig) throws ServletException {
super(servletConfig);
}
/**
* Overrides the implementation in DefaultUrlProvider to do everything that class does, but
* also to rename objects based on the transaction ID.
*
* Each object is renamed to the following format:
* transactionId.objectCount.objectExtension
*
* Objects that arrive with the metadata property
* {@link GatekeeperMessage#SUMMARY_DOCUMENT_METADATA_FLAG} as treated as special cases, as this
* flag indicates that the object is an XML summary document provided by the JetS3t
* {@link org.jets3t.apps.uploader.Uploader} application. In this case, the object should not
* be renamed as it is already named according to the last transaction ID.
*
*
* @param signatureRequest
* @param messageProperties
* @throws S3ServiceException
*/
protected void updateObject(SignatureRequest signatureRequest, Properties messageProperties)
throws S3ServiceException
{
super.updateObject(signatureRequest, messageProperties);
String transactionId = messageProperties.getProperty(GatekeeperMessage.PROPERTY_TRANSACTION_ID);
Map objectMetadata = signatureRequest.getObjectMetadata();
if (transactionId != null) {
if (lastTransactionId.equals(transactionId)) {
// No need to reset the object count, we are still working on the same transaction ID.
} else {
// This is a new transaction ID, reset the object count.
countOfRenamedObjects = 0;
lastTransactionId = transactionId;
}
String originalKey = signatureRequest.getObjectKey();
if (objectMetadata.containsKey(GatekeeperMessage.SUMMARY_DOCUMENT_METADATA_FLAG)) {
if (log.isDebugEnabled()) {
log.debug("Object with key '" + originalKey + "' is flagged as a Summary Document"
+ ", and will not be renamed");
}
} else {
String extension = null;
int lastDotIndex = originalKey.lastIndexOf(".");
if (lastDotIndex >= 0) {
extension = originalKey.substring(lastDotIndex + 1);
}
String newKey = transactionId + "." + (++countOfRenamedObjects)
+ (extension != null? "." + extension : "");
if (log.isDebugEnabled()) {
log.debug("Renamed object key '" + originalKey + "' to '" + newKey + "'");
}
signatureRequest.setObjectKey(newKey);
}
}
}
}