//
//  YaCyLoginService
//  Copyright 2011 by Florian Richter
//  First released 16.04.2011 at http://yacy.net
//  
//  $LastChangedDate$
//  $LastChangedRevision$
//  $LastChangedBy$
//
//  This library 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 2.1 of the License, or (at your option) any later version.
//  
//  This library 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 this program in the file lgpl21.txt
//  If not, see <http://www.gnu.org/licenses/>.
//

package net.yacy.http;

import java.io.IOException;
import java.util.ArrayList;
import net.yacy.data.UserDB.AccessRight;
import net.yacy.data.UserDB.Entry;
import net.yacy.search.Switchboard;
import net.yacy.search.SwitchboardConstants;
import org.eclipse.jetty.security.LoginService;
import org.eclipse.jetty.security.MappedLoginService;
import org.eclipse.jetty.server.UserIdentity;
import org.eclipse.jetty.util.security.Credential;

/**
 * jetty login service, provides admin and YaCy.UserDB users with role assignment
 * with DIGEST auth by default Jetty uses the name of the loginSevice as realmname (which is part of all password hashes)
 */
public class YaCyLoginService extends MappedLoginService implements LoginService {

    @Override
    protected UserIdentity loadUser(String username) {    
        if (username == null || username.isEmpty()) return null; // quick exit

        final Switchboard sb = Switchboard.getSwitchboard();
        String adminuser = sb.getConfig(SwitchboardConstants.ADMIN_ACCOUNT_USER_NAME, "admin");
        Credential credential = null;
        String[] roles = null;
        if (username.equals(adminuser)) {
            final String adminAccountBase64MD5 = sb.getConfig(SwitchboardConstants.ADMIN_ACCOUNT_B64MD5, "");
            // in YaCy the credential hash is composed of username:pwd so the username is needed to create valid credential
            // not just the password (as usually in Jetty). As the accountname for the std. adminuser is not stored a useridentity
            // is created for current user (and the pwd checked against the stored  username:pwd setting)
            credential = YaCyLegacyCredential.getCredentialForAdmin(username, adminAccountBase64MD5);
            // TODO: YaCy user:pwd hashes should longterm likely be switched to separable username + pwd-hash entries
            //       and/or the standard admin account username should be fix = "admin"
            roles = new String[]{AccessRight.ADMIN_RIGHT.toString()};
        } else {
            Entry user = sb.userDB.getEntry(username);
            if (user != null && user.getMD5EncodedUserPwd() != null) {
                // assigning roles from userDB
                ArrayList<String> roletmp = new ArrayList<String>();
                for (final AccessRight right : AccessRight.values()) {
                    if (user.hasRight(right)) {
                        roletmp.add(right.toString());
                    }
                }
                if (roletmp.size() > 0) roles = roletmp.toArray(new String[roletmp.size()]);
                credential = YaCyLegacyCredential.getCredentialForUserDB(username, user.getMD5EncodedUserPwd());
            }
        }

        if (credential != null) {
            if (roles != null) {
                return putUser(username, credential, roles);
            }
            return putUser(username, credential); // w/o role makes not much sense, but succeeds login....
        }
        return null;
    }

    @Override
    protected void loadUsers() throws IOException {
	// don't load any users into MappedLoginService on startup
        // we use loadUser for dynamic checking
    }

}