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package com.sun.enterprise.security.auth.login;

import java.util.*;
import java.util.logging.Level;
import javax.security.auth.*;
import javax.security.auth.callback.*;
import javax.security.auth.login.*;
import javax.security.auth.spi.*;
import com.sun.enterprise.security.auth.realm.file.FileRealm;
import javax.security.auth.login.LoginException;

/**
 * File realm login module.
 *
 * <P>Provides a file-based implementation of a password login module.
 * Processing is delegated to the FileRealm class.
 *
 * @see com.sun.enterprise.security.auth.login.PasswordLoginModule
 * @see com.sun.enterprise.security.auth.realm.file.FileRealm
 *
 */
public class FileLoginModule extends PasswordLoginModule
{

    /**
     * Perform file authentication. Delegates to FileRealm.
     *
     * @throws LoginException If login fails (JAAS login() behavior).
     *
     */
    protected void authenticate()
        throws LoginException
    {
        if (!(_currentRealm instanceof FileRealm)) {
            String msg = sm.getString("filelm.badrealm");
            throw new LoginException(msg);
        }
        FileRealm fileRealm = (FileRealm)_currentRealm;

        String[] grpList = fileRealm.authenticate(_username, _password);

        if (grpList == null) {  // JAAS behavior
            String msg = sm.getString("filelm.faillogin", _username);
            throw new LoginException(msg);
        }

        if (_logger.isLoggable(Level.FINE)) {
            _logger.log(Level.FINE, "File login succeeded for: " + _username);
        }
        //make a copy of groupList to pass to LoginModule. This copy is the one
        // that will be made null there. DO NOT PASS the grpList as is - as 
        // it will get overwritten. Resulting in logins passing only once.
        String[] groupListToForward = new String[grpList.length];
        for (int i = 0; i< grpList.length; i++){
            groupListToForward[i] = grpList[i];
        }
        commitAuthentication(_username, _password,
                             _currentRealm, groupListToForward);
    }
}