com.sshtools.common.files.SpaceRestrictedFileFactoryAdapter Maven / Gradle / Ivy

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/**
 * (c) 2002-2021 JADAPTIVE Limited. All Rights Reserved.
 *
 * This file is part of the Maverick Synergy Java SSH API.
 *
 * Maverick Synergy is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Maverick Synergy 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Maverick Synergy.  If not, see .
 */
package com.sshtools.common.files;

import java.io.IOException;
import java.io.OutputStream;

import com.sshtools.common.events.Event;
import com.sshtools.common.files.SpaceRestrictedFileFactoryAdapter.SpaceRestrictedAbstractFile;
import com.sshtools.common.permissions.PermissionDeniedException;
import com.sshtools.common.sftp.SftpStatusEventException;
import com.sshtools.common.sftp.SftpStatusException;
import com.sshtools.common.util.IOUtils;

public class SpaceRestrictedFileFactoryAdapter implements AbstractFileFactory {

	AbstractFileFactory fileFactory;
	long maximumSize;
	
	public SpaceRestrictedFileFactoryAdapter(AbstractFileFactory fileFactory, long maximumSize) {
		this.fileFactory = fileFactory;
		this.maximumSize = maximumSize;
	}
	
	@Override
	public SpaceRestrictedAbstractFile getFile(String path) throws PermissionDeniedException, IOException {
		return new SpaceRestrictedAbstractFile(fileFactory.getFile(path));
	}

	@Override
	public Event populateEvent(Event evt) {
		return evt;
	}

	@Override
	public SpaceRestrictedAbstractFile getDefaultPath() throws PermissionDeniedException, IOException {
		return new SpaceRestrictedAbstractFile(fileFactory.getDefaultPath());
	}
	
	long getCurrentSize(AbstractFile file) throws IOException, PermissionDeniedException {
		
		long size = 0;
		if(file.isDirectory()) {
			for(AbstractFile dir : file.getChildren()) {
				size += getCurrentSize(dir);
			}
		} else {
			return file.length();
		}
		
		return size;
	}
	
	class SpaceRestrictedAbstractFile extends AbstractFileAdapter {

		public SpaceRestrictedAbstractFile(AbstractFile file) {
			super(file);
		}
		
		public boolean supportsRandomAccess() {
			return false;
		}
		
		@Override
		public OutputStream getOutputStream() throws IOException, PermissionDeniedException {
			return new RestrictedSizeOutputStream(super.getOutputStream(), 
					maximumSize - getCurrentSize(getDefaultPath()));
		}

		@Override
		public OutputStream getOutputStream(boolean append) throws IOException, PermissionDeniedException {
			return new RestrictedSizeOutputStream(super.getOutputStream(append), 
					maximumSize - getCurrentSize(getDefaultPath()) - (append ? length() : 0));
		}		
	}
	
	
	static class RestrictedSizeOutputStream extends OutputStream {

		long restrictedSize;
		long bytesWritten = 0;
		OutputStream out;
		RestrictedSizeOutputStream(OutputStream out, long restrictedSize) {
			this.out = out;
			this.restrictedSize = restrictedSize;
		}

		@Override
		public void write(byte[] b, int off, int len) throws IOException {
			
			
			if(restrictedSize > 0) {
				if(bytesWritten + len > restrictedSize) {
					throw new SftpStatusEventException(SftpStatusException.SSH_FX_QUOTA_EXCEEDED,
							"Out of quota disk space [" + IOUtils.toByteSize(restrictedSize) + "]");
				}
			}
			out.write(b, off, len);
			bytesWritten+=len;
		}
		
		@Override
		public void write(int b) throws IOException {
			
			if(restrictedSize > 0) {
				if(bytesWritten + 1 > restrictedSize) {
					throw new SftpStatusEventException(SftpStatusException.SSH_FX_QUOTA_EXCEEDED,
							"Out of quota disk space [" + IOUtils.toByteSize(restrictedSize) + "]");
				}
			}
			
			out.write(b);
			++bytesWritten;
		}
		
		
		public void close() throws IOException {
			out.close();
		}
		
		
		
	}
}