package org.apache.maven.wagon.providers.ssh;

 /*

  * 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.

  */

 import org.apache.sshd.server.Command;

 import org.apache.sshd.server.CommandFactory;

 import java.util.ArrayList;

 import java.util.List;

 /**

  * This <code>CommandFactory</code> can be used as a standalone command factory

  * or can be used to augment another <code>CommandFactory</code> and provides

  * <code>SCP</code> support.

  *

  * @see ScpCommand

  *

  * @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a>

  */

 public class ScpCommandFactory

     implements CommandFactory {

     private CommandFactory delegate;

     public ScpCommandFactory() {

     }

     public ScpCommandFactory( CommandFactory delegate ) {

         this.delegate = delegate;

     }

     /**

      * Parses a command string and verifies that the basic syntax is

      * correct. If parsing fails the responsibility is delegated to

      * the configured {@link org.apache.sshd.server.CommandFactory} instance; if one exist.

      *

      * @param command command to parse

      * @return configured {@link org.apache.sshd.server.Command} instance

      * @throws IllegalArgumentException

      */

     public Command createCommand(String command) {

         try {

             return new ScpCommand(splitCommandString(command));

         } catch (IllegalArgumentException iae) {

             if (delegate != null) {

                 return delegate.createCommand(command);

             }

             throw iae;

         }

     }

     private String[] splitCommandString(String command) {

         if (!command.trim().startsWith("scp")) {

             throw new IllegalArgumentException("Unknown command, does not begin with 'scp'");

         }

         String[] args = command.split(" ");

         List<String> parts = new ArrayList<String>();

         parts.add(args[0]);

         for (int i = 1; i < args.length; i++) {

             if (!args[i].trim().startsWith("-")) {

                 parts.add(concatenateWithSpace(args, i));

                 break;

             } else {

                 parts.add(args[i]);

             }

         }

         return parts.toArray(new String[parts.size()]);

     }

     private String concatenateWithSpace(String[] args, int from) {

         StringBuilder sb = new StringBuilder();

         for (int i = from; i < args.length; i++) {

             sb.append(args[i] + " ");

         }

         return sb.toString().trim();

     }

 }