// Copyright 2012 Citrix Systems, Inc. Licensed under the
// Apache License, Version 2.0 (the "License"); you may not use this
// file except in compliance with the License.  Citrix Systems, Inc.
// reserves all rights not expressly granted by 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.
// 
// Automatically generated by addcopyright.py at 04/03/2012
package com.cloud.server.auth;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Map;

import javax.ejb.Local;
import javax.naming.ConfigurationException;

import org.apache.log4j.Logger;

import com.cloud.server.ManagementServer;
import com.cloud.user.UserAccount;
import com.cloud.user.dao.UserAccountDao;
import com.cloud.utils.component.ComponentLocator;
import com.cloud.utils.exception.CloudRuntimeException;


@Local(value={UserAuthenticator.class})
public class PlainTextUserAuthenticator extends DefaultUserAuthenticator {
	public static final Logger s_logger = Logger.getLogger(PlainTextUserAuthenticator.class);
	
	private UserAccountDao _userAccountDao;
	
	@Override
	public boolean authenticate(String username, String password, Long domainId, Map<String, Object[]> requestParameters ) {
		if (s_logger.isDebugEnabled()) {
            s_logger.debug("Retrieving user: " + username);
        }
        UserAccount user = _userAccountDao.getUserAccount(username, domainId);
        if (user == null) {
            s_logger.debug("Unable to find user with " + username + " in domain " + domainId);
            return false;
        }
        
       
        MessageDigest md5;
        try {
            md5 = MessageDigest.getInstance("MD5");
        } catch (NoSuchAlgorithmException e) {
            throw new CloudRuntimeException("Error", e);
        }
        md5.reset();
        BigInteger pwInt = new BigInteger(1, md5.digest(password.getBytes()));

        // make sure our MD5 hash value is 32 digits long...
        StringBuffer sb = new StringBuffer();
        String pwStr = pwInt.toString(16);
        int padding = 32 - pwStr.length();
        for (int i = 0; i < padding; i++) {
            sb.append('0');
        }
        sb.append(pwStr);
        
        
        // Will: The MD5Authenticator is now a straight pass-through comparison of the
        // the passwords because we will not assume that the password passed in has
        // already been MD5 hashed.  I am keeping the above code in case this requirement changes
        // or people need examples of how to MD5 hash passwords in java.
        if (!user.getPassword().equals(sb.toString())) {
            s_logger.debug("Password does not match");
            return false;
        }
		return true;
	}

	public boolean configure(String name, Map<String, Object> params)
			throws ConfigurationException {
		super.configure(name, params);
		ComponentLocator locator = ComponentLocator.getLocator(ManagementServer.Name);
		_userAccountDao = locator.getDao(UserAccountDao.class);
		return true;
	}
}