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A Java library for reading Apache httpd configuration files
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 *
 *   Copyright (C) 2010-2014 Christian Bockermann 
 *    
 *   This file is part of the jwall.org apache-config library. The apache-config library is
 *   a parsing library to handle Apache HTTPD configuration files.
 *
 *   More information and documentation for the jwall-tools can be found at
 *   
 *                      http://www.jwall.org/apache-config
 *   
 *   This program is free software; you can redistribute it and/or modify it under
 *   the terms of the GNU General Public License as published by the Free Software
 *   Foundation; either version 3 of the License, or (at your option) any later version.
 *   
 *   This program is distributed in the hope that it will be useful, but WITHOUT ANY
 *   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 *   FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 * 
 *   You should have received a copy of the GNU General Public License along with this 
 *   program; if not, see .
 *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
package org.jwall.apache.httpd.service;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.Reader;
import java.net.URL;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class DefaultFileSystem extends AbstractFileSystem {

	static Logger log = LoggerFactory.getLogger( DefaultFileSystem.class );
	File baseDir;
	
	
	public DefaultFileSystem(){
		this.baseDir = null;
	}
	
	public DefaultFileSystem( String base ) throws IOException {
		this( new File( base ) );
	}
	
	public DefaultFileSystem( File baseDir ) throws IOException {
		this.baseDir = baseDir;
		if( this.baseDir.isFile() )
			throw new IOException( "Cannot create file-system within a file!" );
		
		if( ! baseDir.isDirectory() )
			baseDir.mkdirs();
	}
	

	protected File map( File file ){
		if( baseDir == null )
			return file;
		
		return new File( baseDir.getAbsolutePath() + File.separator + file.getPath() );
	}
	
	protected File unmap( File file ){
		if( baseDir == null )
			return file;
		
		String prefix = baseDir.getAbsolutePath();
		if( file.getAbsolutePath().startsWith( prefix ) ){
			File f = new File( file.getAbsolutePath().replaceFirst( prefix, "" ) );
			log.debug( "Un-mapped file: {}", f.getAbsolutePath() );
			return f;
		}
		return file;
	}
	
	
	
	public Reader openFile(File file) throws IOException {
		return new FileReader( map(file) );
	}

	public boolean isDirectory(File file) {
		return map(file).isDirectory();
	}

	public File[] listFiles(File directory) {
		
		File[] list = map(directory).listFiles();
		for( int i = 0; i < list.length; i++ )
			list[i] = unmap( list[i] );
		
		return list;
	}

	public boolean canRead(File file) {
		return map(file).canRead();
	}

	public boolean exists(File file) {
		return map(file).exists();
	}

	public String getAbsolutePath(File file) {
		return map(file).getAbsolutePath();
	}


	/**
	 * @see org.jwall.apache.httpd.service.FileSystem#getURL()
	 */
	public URL getURL( File file ) {
		try {
			return map(file).toURI().toURL();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}



	public InputStream openInputStream(File file) throws IOException {
		log.debug( "Opening FileInputStream on {}", map(file) );
		return new FileInputStream( map(file) );
	}

	public OutputStream openOutputStream(File file) throws IOException {
		File out = map( file );
		log.debug( "Opening output-stream to {}", out );
		if( out.getParentFile() != null && ! out.getParentFile().isDirectory() ){
			out.getParentFile().mkdirs();
			log.debug( "Created directory {}", out.getParent() );
		}
		return new FileOutputStream( out );
	}

	public byte[] get(File f) throws IOException {

		File file = map( f );
		
		Long size = file.length();
		byte[] buf = new byte[ size.intValue() ];

		FileInputStream fis = new FileInputStream( file );
		fis.read( buf );
		fis.close();
		return buf;
	}

	public void put(File file, byte[] content) throws IOException {
		OutputStream out = this.openOutputStream( map(file) );
		out.write( content );
		out.close();
	}


	public void createSymlink( String destination, File name) throws IOException {
		log.debug( "Create symlink: {} -> {}", destination, name );
		log.debug( "  relative from {}", name.getParent() );
		if( name.getParentFile() != null )
			createDirectory( name.getParentFile() );
		
		String cmd = "ln -s " + destination + " " + map(name); //.getAbsolutePath();
		log.debug( "Creating symlink: {}", cmd );
		Runtime.getRuntime().exec( cmd );
	}

	public boolean isSymlink(File file) {
		try {
			String cmd = "readlink " + map(file).getAbsolutePath();
			Process p = Runtime.getRuntime().exec( cmd );

			BufferedReader r = new BufferedReader( new InputStreamReader( p.getInputStream() ) );
			String result = r.readLine();
			r.close();
			return result != null && !result.equals( file.getAbsolutePath() );
		} catch (Exception e) {
			e.printStackTrace();
		}
		return false;
	}
	
	public String readSymlink( File file ) throws IOException {
		try {
			String cmd = "readlink " + map(file).getAbsolutePath();
			Process p = Runtime.getRuntime().exec( cmd );

			BufferedReader r = new BufferedReader( new InputStreamReader( p.getInputStream() ) );
			String result = r.readLine();
			r.close();
			
			if( result != null )
				return result;
			
			return result;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return "";
	}

	public boolean createDirectory(File file) throws IOException {
		return map(file).mkdirs();
	}

	public boolean delete(File file) throws IOException {
		return map(file).delete();
	}

	public File resolveSymlink(File symlink) throws IOException {
		
		String lnk = readSymlink( symlink );
		File dst = new File( lnk );
		if( dst.isAbsolute() )
			return dst;
		else
			return new File( symlink.getParent() + File.separator + lnk );
	}
}