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Camel FTP support
There is a newer version: 4.8.1
/*
 * 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.net.URI;
import java.util.Map;

import org.apache.camel.CamelContext;
import org.apache.camel.Endpoint;
import org.apache.camel.component.file.GenericFileEndpoint;
import org.apache.camel.spi.annotations.Component;
import org.apache.camel.support.EndpointHelper;
import org.apache.camel.support.component.PropertyConfigurerSupport;
import org.apache.camel.util.PropertiesHelper;
import org.apache.camel.util.StringHelper;
import org.apache.commons.net.ftp.FTPFile;

/**
 * FTP Component
 */
@Component("ftp")
public class FtpComponent extends RemoteFileComponent {

    public FtpComponent() {
    }

    public FtpComponent(CamelContext context) {
        super(context);
    }

    @Override
    protected GenericFileEndpoint buildFileEndpoint(String uri, String remaining, Map parameters)
            throws Exception {
        String baseUri = getBaseUri(uri);

        // lets make sure we create a new configuration as each endpoint can
        // customize its own version
        // must pass on baseUri to the configuration (see above)
        FtpConfiguration config = new FtpConfiguration(new URI(baseUri));

        FtpUtils.ensureRelativeFtpDirectory(this, config);

        FtpEndpoint answer = new FtpEndpoint<>(uri, this, config);
        extractAndSetFtpClientConfigParameters(parameters, answer);
        extractAndSetFtpClientParameters(parameters, answer);

        return answer;
    }

    /**
     * Get the base uri part before the options as they can be non URI valid such as the expression using $ chars and
     * the URI constructor will regard $ as an illegal character and we don't want to enforce end users to to escape the
     * $ for the expression (file language)
     */
    protected String getBaseUri(String uri) {
        return StringHelper.before(uri, "?", uri);
    }

    /**
     * Extract additional ftp client configuration options from the parameters map (parameters starting with
     * 'ftpClientConfig.'). To remember these parameters, we set them in the endpoint and we can use them when creating
     * a client.
     */
    protected void extractAndSetFtpClientConfigParameters(Map parameters, FtpEndpoint answer) {
        if (PropertiesHelper.hasProperties(parameters, "ftpClientConfig.")) {
            Map param = PropertiesHelper.extractProperties(parameters, "ftpClientConfig.");
            answer.setFtpClientConfigParameters(param);
        }
    }

    /**
     * Extract additional ftp client options from the parameters map (parameters starting with 'ftpClient.'). To
     * remember these parameters, we set them in the endpoint and we can use them when creating a client.
     */
    protected void extractAndSetFtpClientParameters(Map parameters, FtpEndpoint answer) {
        if (PropertiesHelper.hasProperties(parameters, "ftpClient.")) {
            Map param = PropertiesHelper.extractProperties(parameters, "ftpClient.");
            answer.setFtpClientParameters(param);
        }
    }

    @Override
    protected void setProperties(Endpoint endpoint, Map parameters) throws Exception {
        Object siteCommand = parameters.remove("siteCommand");
        if (siteCommand != null) {
            String cmd = PropertyConfigurerSupport.property(getCamelContext(), String.class, siteCommand);
            if (EndpointHelper.isReferenceParameter(cmd)) {
                cmd = EndpointHelper.resolveReferenceParameter(getCamelContext(), cmd, String.class);
            }
            ((FtpEndpoint) endpoint).getConfiguration().setSiteCommand(cmd);
        }
        super.setProperties(endpoint, parameters);
    }

    @Override
    protected void afterPropertiesSet(GenericFileEndpoint endpoint) throws Exception {
        // noop
    }
}