ParcelManagerImpl.java

/*******************************************************************************
 * Copyright 2011 Pascal Metrics
 * 
 * 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.opensafety.hishare.managers.implementation.http;

import java.util.Arrays;
import java.util.Calendar;
import java.util.Date;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.opensafety.hishare.dao.interfaces.ParcelDao;
import org.opensafety.hishare.managers.interfaces.ParcelManager;
import org.opensafety.hishare.managers.interfaces.PayloadManager;
import org.opensafety.hishare.model.Parcel;
import org.opensafety.hishare.util.interfaces.Encryption;
import org.opensafety.hishare.util.interfaces.Encryption.CryptographyException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.ImportResource;

@Configuration
public class ParcelManagerImpl implements ParcelManager
{
	@Autowired
	private ParcelDao parcelDao;
	@Autowired
	private PayloadManager payloadManager;
	@Autowired
	private Encryption encryption;
	
	private @Value("${managers.maximumParcelExpiration}") int maximumParcelExpiration;
	
	Log log = LogFactory.getLog(this.getClass());
	
	public ParcelManagerImpl()
	{
	}
	
	public int getMaximumParcelExpiration()
	{
		return maximumParcelExpiration;
	}
	
	public void setMaximumParcelExpiration(int maximumParcelExpiration)
	{
		this.maximumParcelExpiration = maximumParcelExpiration;
	}
	
	private boolean notExpired(Parcel parcel)
    {
		Date expiration = parcel.getExpirationDate();
		Date now = Calendar.getInstance().getTime();
		
		return now.before(expiration);
    }
	
	public boolean deleteParcel(Parcel parcel)
	{
		boolean deletePayload = payloadManager.deletePayload(parcel.getPayloadLocation());
		boolean deleteParcel = parcelDao.deleteParcel(parcel);
		return deletePayload && deleteParcel;
	}
	
	public byte[] downloadPayload(Parcel parcel)
	{
		//seriously, you can't download after expiration
		if(notExpired(parcel))
		{
			return payloadManager.downloadPayload(parcel);
		}
		else
		{
			return null;
		}
	}

	public Parcel getParcel(String parcelId, String parcelPassword)
	{
		if(parcelDao.verifyParcelAvailable(parcelId))
		{
			Parcel parcel = parcelDao.getById(parcelId);
			try
			{
				byte[] hashedPassword = encryption.hashPassword(parcelPassword, parcel.getSalt());
				if(Arrays.equals(hashedPassword, parcel.getHashedPassword()))
				{
					parcel.setPassword(parcelPassword);
					return parcel;
				}
				else
				{
					return null;
				}
			}
			catch(CryptographyException e)
			{
				log.error("Password Matching Threw Exception!", e);
				return null;
			}
		}
		return null;
	}
	
	public void persistParcel(Parcel parcel, byte[] payload)
	{
		parcelDao.addParcel(parcel);
		payloadManager.persistPayload(parcel, payload);
	}
	
	public void updateParcel(Parcel parcel)
	{
		parcelDao.updateParcel(parcel);
	}
	
	/*
	 * Verify that this parcel id exists and that the password is correct
	 */
	public boolean verifyParcelAvailable(String parcelId, String parcelPassword)
	{
		if(parcelDao.verifyParcelAvailable(parcelId))
		{
			Parcel parcel = parcelDao.getById(parcelId);
			
			if(parcel == null)
			{
				return false;
			}
			
			if(notExpired(parcel))
			{
				try
				{
					byte[] hashedPassword = encryption.hashPassword(parcelPassword, parcel.getSalt());
					return Arrays.equals(hashedPassword, parcel.getHashedPassword());
				}
				catch(CryptographyException e)
				{
					log.error("Password Matching Threw Exception!",e);
					return false;
				}
			}
		}
		return false;
	}

	public boolean verifyDaysToLive(int daysToLive)
    {
		return daysToLive <= maximumParcelExpiration;
    }
}