package org.openslx.imagemaster.server;

import org.apache.log4j.Logger;
import org.openslx.imagemaster.session.Authenticator;
import org.openslx.imagemaster.session.Session;
import org.openslx.imagemaster.session.SessionManager;
import org.openslx.imagemaster.session.User;
import org.openslx.imagemaster.thrift.iface.AuthenticationError;
import org.openslx.imagemaster.thrift.iface.AuthenticationException;
import org.openslx.imagemaster.thrift.iface.InvalidTokenException;
import org.openslx.imagemaster.thrift.iface.SessionData;
import org.openslx.imagemaster.thrift.iface.UserInfo;

/**
 * API Server This is where all the requests from the outside arrive. We don't
 * handle them directly in the Thrift handlers, as we might be adding other APIs
 * later, like JSON/SOAP/REST/HTTP/XML or some other stuff. They'd all just
 * interface with this static class here. Note that we use the exceptions from
 * the thrift interface that you can simply catch in any other API handler and
 * eg. transform into error codes, if the API doesn't support exceptions.
 * 
 * This will be accessed from multiple threads, so use synchronization when
 * needed (or in doubt)
 */
public class ApiServer
{
	@SuppressWarnings( "unused" )
	private static Logger log = Logger.getLogger( ApiServer.class );

	/**
	 * Request for authentication
	 * @param login (username@organization)
	 * @param password
	 * @return SessionData struct with session id/token iff login successful
	 * @throws AuthenticationException if login not successful
	 */
	public static SessionData authenticate( String login, String password )
			throws AuthenticationException {
		if ( login == null || password == null ) {
			throw new AuthenticationException( AuthenticationError.INVALID_CREDENTIALS, "Empty username or password!" );
		}
		final User user = Authenticator.authenticate( login, password );

		final Session session = new Session( user );
		return SessionManager.addSession( session );
	}

	/**
	 * Request information about user for given token
	 * @param token - a user's token
	 * @return UserInfo struct for given token's user
	 * @throws InvalidTokenException if no user matches the given token
	 */
	public static UserInfo getUserFromToken( String token )
			throws InvalidTokenException
	{
		final Session session = SessionManager.getSession( token );
		if ( session == null )
			throw new InvalidTokenException();
		return new UserInfo( session.getUserId(), session.getFirstName(), session.getLastName(), session.getEMail() );
	}

}