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The MockFtpServer project provides mock/dummy FTP server implementations for testing FTP client code. Two FTP Server implementations are provided, each at a different level of abstraction. FakeFtpServer provides a higher-level abstraction. You define a virtual file system, including directories and files, as well as a set of valid user accounts and credentials. The FakeFtpServer then responds with appropriate replies and reply codes based on that configuration. StubFtpServer, on the other hand, is a lower-level "stub" implementation. You configure the individual FTP server commands to return custom data or reply codes, allowing simulation of either success or failure scenarios. You can also verify expected command invocations.

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/*
 * Copyright 2007 the original author or authors.
 * 
 * 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.mockftpserver.stub.command;

import org.mockftpserver.core.command.Command;
import org.mockftpserver.core.command.CommandHandler;
import org.mockftpserver.core.command.InvocationRecord;
import org.mockftpserver.core.session.Session;
import org.mockftpserver.core.util.Assert;

/**
 * CommandHandler for the RETR (Retrieve) command. Return the configured file contents on the data
 * connection, along with two replies on the control connection: a reply code of 150 and
 * another of 226. By default, return an empty file (i.e., a zero-length byte[]). You can
 * customize the returned file contents by setting the fileContents property,
 * specified either as a String or as a byte array.
 * 
 * Each invocation record stored by this CommandHandler includes the following data element key/values:
 * 

 * {@link #PATHNAME_KEY} ("pathname") - the pathname of the file submitted on the invocation (the first command parameter)
 * 
 *
 * @author Chris Mair
 */
public class RetrCommandHandler extends AbstractStubDataCommandHandler implements CommandHandler {

    public static final String PATHNAME_KEY = "pathname";

    private byte[] fileContents = new byte[0];

    /**
     * Create new uninitialized instance
     */
    public RetrCommandHandler() {
    }

    /**
     * Create new instance using the specified fileContents
     *
     * @param fileContents - the file contents
     * @throws org.mockftpserver.core.util.AssertFailedException
     *          - if the fileContents is null
     */
    public RetrCommandHandler(String fileContents) {
        setFileContents(fileContents);
    }

    /**
     * Create new instance using the specified fileContents
     *
     * @param fileContents - the file contents
     * @throws org.mockftpserver.core.util.AssertFailedException
     *          - if the fileContents is null
     */
    public RetrCommandHandler(byte[] fileContents) {
        setFileContents(fileContents);
    }

    /**
     * @see org.mockftpserver.stub.command.AbstractStubDataCommandHandler#beforeProcessData(org.mockftpserver.core.command.Command, org.mockftpserver.core.session.Session, org.mockftpserver.core.command.InvocationRecord)
     */
    protected void beforeProcessData(Command command, Session session, InvocationRecord invocationRecord) throws Exception {
        String filename = command.getRequiredParameter(0);
        invocationRecord.set(PATHNAME_KEY, filename);
    }

    /**
     * @see org.mockftpserver.stub.command.AbstractStubDataCommandHandler#processData(org.mockftpserver.core.command.Command, org.mockftpserver.core.session.Session, org.mockftpserver.core.command.InvocationRecord)
     */
    protected void processData(Command command, Session session, InvocationRecord invocationRecord) {
        LOG.info("Sending " + fileContents.length + " bytes");
        session.sendData(fileContents, fileContents.length);
    }

    /**
     * Set the file contents to return from subsequent command invocations
     *
     * @param fileContents - the fileContents to set
     * @throws org.mockftpserver.core.util.AssertFailedException
     *          - if the fileContents is null
     */
    public void setFileContents(String fileContents) {
        Assert.notNull(fileContents, "fileContents");
        setFileContents(fileContents.getBytes());
    }

    /**
     * Set the file contents to return from subsequent command invocations
     *
     * @param fileContents - the file contents
     * @throws org.mockftpserver.core.util.AssertFailedException
     *          - if the fileContents is null
     */
    public void setFileContents(byte[] fileContents) {
        Assert.notNull(fileContents, "fileContents");
        this.fileContents = fileContents;
    }

}