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/*
* 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.file.remote;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import com.jcraft.jsch.ChannelSftp;
import com.jcraft.jsch.SftpException;
import org.apache.camel.Exchange;
import org.apache.camel.Message;
import org.apache.camel.Processor;
import org.apache.camel.component.file.GenericFile;
import org.apache.camel.component.file.GenericFileOperationFailedException;
import org.apache.camel.component.file.GenericFileProcessStrategy;
import org.apache.camel.util.FileUtil;
import org.apache.camel.util.ObjectHelper;
import org.apache.camel.util.StringHelper;
import org.apache.camel.util.URISupport;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Secure FTP consumer
*/
public class SftpConsumer extends RemoteFileConsumer {
private static final Logger LOG = LoggerFactory.getLogger(SftpConsumer.class);
private String endpointPath;
private transient String sftpConsumerToString;
public SftpConsumer(RemoteFileEndpoint endpoint, Processor processor,
RemoteFileOperations operations,
GenericFileProcessStrategy processStrategy) {
super(endpoint, processor, operations, processStrategy);
this.endpointPath = endpoint.getConfiguration().getDirectory();
}
@Override
protected void doStart() throws Exception {
// turn off scheduler first, so autoCreate is handled before scheduler
// starts
boolean startScheduler = isStartScheduler();
setStartScheduler(false);
try {
super.doStart();
if (endpoint.isAutoCreate() && hasStartingDirectory()) {
String dir = endpoint.getConfiguration().getDirectory();
LOG.debug("Auto creating directory: {}", dir);
try {
connectIfNecessary();
operations.buildDirectory(dir, true);
} catch (GenericFileOperationFailedException e) {
// log a WARN as we want to start the consumer.
LOG.warn(
"Error auto creating directory: " + dir + " due " + e.getMessage() + ". This exception is ignored.",
e);
}
}
} finally {
if (startScheduler) {
setStartScheduler(true);
startScheduler();
}
}
}
@Override
protected boolean pollDirectory(String fileName, List> fileList, int depth) {
String currentDir = null;
if (isStepwise()) {
// must remember current dir so we stay in that directory after the
// poll
currentDir = operations.getCurrentDirectory();
}
// strip trailing slash
fileName = FileUtil.stripTrailingSeparator(fileName);
boolean answer = doPollDirectory(fileName, null, fileList, depth);
if (currentDir != null) {
operations.changeCurrentDirectory(currentDir);
}
return answer;
}
protected boolean pollSubDirectory(
String absolutePath, String dirName, List> fileList, int depth) {
boolean answer = doSafePollSubDirectory(absolutePath, dirName, fileList, depth);
// change back to parent directory when finished polling sub directory
if (isStepwise()) {
operations.changeToParentDirectory();
}
return answer;
}
@Override
protected boolean doPollDirectory(
String absolutePath, String dirName, List> fileList, int depth) {
LOG.trace("doPollDirectory from absolutePath: {}, dirName: {}", absolutePath, dirName);
depth++;
// remove trailing /
dirName = FileUtil.stripTrailingSeparator(dirName);
// compute dir depending on stepwise is enabled or not
String dir = null;
if (isStepwise()) {
dir = ObjectHelper.isNotEmpty(dirName) ? dirName : absolutePath;
operations.changeCurrentDirectory(dir);
} else {
dir = absolutePath;
}
final SftpRemoteFile[] files = getSftpRemoteFiles(dir);
if (files == null || files.length == 0) {
// no files in this directory to poll
LOG.trace("No files found in directory: {}", dir);
return true;
} else {
// we found some files
LOG.trace("Found {} files in directory: {}", files.length, dir);
}
if (getEndpoint().isPreSort()) {
Arrays.sort(files, Comparator.comparing(SftpRemoteFile::getFilename));
}
for (SftpRemoteFile file : files) {
if (LOG.isTraceEnabled()) {
LOG.trace("SftpFile[fileName={}, longName={}, dir={}]", file.getFilename(), file.getLongname(),
file.isDirectory());
}
// check if we can continue polling in files
if (!canPollMoreFiles(fileList)) {
return false;
}
if (file.isDirectory()) {
RemoteFile remote = asRemoteFile(absolutePath, file, getEndpoint().getCharset());
if (endpoint.isRecursive() && depth < endpoint.getMaxDepth() && isValidFile(remote, true, files)) {
// recursive scan and add the sub files and folders
String subDirectory = file.getFilename();
String path = ObjectHelper.isNotEmpty(absolutePath) ? absolutePath + "/" + subDirectory : subDirectory;
boolean canPollMore = pollSubDirectory(path, subDirectory, fileList, depth);
if (!canPollMore) {
return false;
}
}
// we cannot use file.getAttrs().isLink on Windows, so we dont
// invoke the method
// just assuming its a file we should poll
} else {
RemoteFile remote = asRemoteFile(absolutePath, file, getEndpoint().getCharset());
if (depth >= endpoint.getMinDepth() && isValidFile(remote, false, files)) {
// matched file so add
fileList.add(remote);
}
}
}
return true;
}
private SftpRemoteFile[] listFiles(String dir) {
if (isStepwise()) {
return operations.listFiles();
}
return operations.listFiles(dir);
}
private SftpRemoteFile[] getSftpRemoteFiles(String dir) {
SftpRemoteFile[] files = null;
try {
LOG.trace("Polling directory: {}", dir);
if (isUseList()) {
files = listFiles(dir);
} else {
files = pollNamedFile();
}
} catch (GenericFileOperationFailedException e) {
if (ignoreCannotRetrieveFile(null, null, e)) {
LOG.debug("Cannot list files in directory {} due directory does not exists or file permission error.", dir);
} else {
throw e;
}
}
return files;
}
private SftpRemoteFile[] pollNamedFile() {
SftpRemoteFile[] files = null;
// we cannot use the LIST command(s) so we can only poll a named
// file so created a pseudo file with that name
Exchange dummy = endpoint.createExchange();
String name = evaluateFileExpression(dummy);
if (name != null) {
SftpRemoteFile file = new SftpRemoteFileSingle(name);
files = new SftpRemoteFile[1];
files[0] = file;
}
return files;
}
@Override
protected boolean isMatched(GenericFile file, String doneFileName, SftpRemoteFile[] files) {
String onlyName = FileUtil.stripPath(doneFileName);
for (SftpRemoteFile f : files) {
if (f.getFilename().equals(onlyName)) {
return true;
}
}
LOG.trace("Done file: {} does not exist", doneFileName);
return false;
}
@Override
protected boolean ignoreCannotRetrieveFile(String name, Exchange exchange, Exception cause) {
if (getEndpoint().getConfiguration().isIgnoreFileNotFoundOrPermissionError()) {
SftpException sftp = ObjectHelper.getException(SftpException.class, cause);
if (sftp != null) {
return sftp.id == ChannelSftp.SSH_FX_NO_SUCH_FILE || sftp.id == ChannelSftp.SSH_FX_PERMISSION_DENIED;
}
}
return super.ignoreCannotRetrieveFile(name, exchange, cause);
}
private RemoteFile asRemoteFile(String absolutePath, SftpRemoteFile file, String charset) {
RemoteFile answer = new RemoteFile<>();
answer.setCharset(charset);
answer.setEndpointPath(endpointPath);
answer.setFile(file);
answer.setFileNameOnly(file.getFilename());
answer.setFileLength(file.getFileLength());
answer.setLastModified(file.getLastModified());
answer.setHostname(((RemoteFileConfiguration) endpoint.getConfiguration()).getHost());
answer.setDirectory(file.isDirectory());
// absolute or relative path
boolean absolute = FileUtil.hasLeadingSeparator(absolutePath);
answer.setAbsolute(absolute);
// create a pseudo absolute name
String dir = FileUtil.stripTrailingSeparator(absolutePath);
String absoluteFileName = FileUtil.stripLeadingSeparator(dir + "/" + file.getFilename());
// if absolute start with a leading separator otherwise let it be
// relative
if (absolute) {
absoluteFileName = "/" + absoluteFileName;
}
answer.setAbsoluteFilePath(absoluteFileName);
// the relative filename, skip the leading endpoint configured path
String relativePath = StringHelper.after(absoluteFileName, endpointPath);
// skip trailing /
relativePath = FileUtil.stripLeadingSeparator(relativePath);
answer.setRelativeFilePath(relativePath);
// the file name should be the relative path
answer.setFileName(answer.getRelativeFilePath());
return answer;
}
@Override
protected void updateFileHeaders(GenericFile file, Message message) {
Object rf = file.getFile().getRemoteFile();
if (rf != null) {
ChannelSftp.LsEntry e = (ChannelSftp.LsEntry) rf;
long length = e.getAttrs().getSize();
long modified = e.getAttrs().getMTime() * 1000L;
file.setFileLength(length);
file.setLastModified(modified);
if (length >= 0) {
message.setHeader(FtpConstants.FILE_LENGTH, length);
}
if (modified >= 0) {
message.setHeader(FtpConstants.FILE_LAST_MODIFIED, modified);
}
}
}
private boolean isStepwise() {
RemoteFileConfiguration config = (RemoteFileConfiguration) endpoint.getConfiguration();
return config.isStepwise();
}
private boolean isUseList() {
RemoteFileConfiguration config = (RemoteFileConfiguration) endpoint.getConfiguration();
return config.isUseList();
}
@Override
public String toString() {
if (sftpConsumerToString == null) {
sftpConsumerToString = "SftpConsumer[" + URISupport.sanitizeUri(getEndpoint().getEndpointUri()) + "]";
}
return sftpConsumerToString;
}
}
