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package pt.agap2.custom_login;

import java.util.regex.Pattern;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import pt.agap2.util.EncryptConstants;
import pt.agap2.util.TripleDesImpl;

import com.liferay.portal.kernel.exception.PortalException;
import com.liferay.portal.kernel.exception.SystemException;
import com.liferay.portal.model.User;
import com.liferay.portal.security.auth.AutoLogin;
import com.liferay.portal.security.auth.AutoLoginException;
import com.liferay.portal.service.UserLocalServiceUtil;
import com.liferay.portal.util.PortalUtil;

public class Agap2CustomLogin implements AutoLogin {

	Log _log = LogFactory.getLog(Agap2CustomLogin.class);
	private final long TICKS_AT_EPOCH = 621355968000000000L;
	private final long TICKS_PER_MILLISECOND = 10000L;
	private final long DELTA = 30000L;
	User user = null;

	public String[] login(HttpServletRequest request,
			HttpServletResponse response) throws AutoLoginException {
		String[] credentials = null;

		long companyId = PortalUtil.getCompanyId(request);

		String authEncStr = request.getParameter("auth");
		Long currentTimeInMilliseconds = System.currentTimeMillis();
		String authDEncStr = TripleDesImpl.decrypt(authEncStr,
				EncryptConstants.CRYPT_KEY);
		String userName = null;

		if (authDEncStr != null
				&& Pattern
						.compile(
								Pattern.quote(EncryptConstants.SHARED_EXTERNAL_SITES_GUID),
								Pattern.CASE_INSENSITIVE).matcher(authDEncStr)
						.find()) {
			authDEncStr = authDEncStr
					.substring(EncryptConstants.SHARED_EXTERNAL_SITES_GUID
							.length());

			String strTicks = authDEncStr
					.substring(authDEncStr.indexOf("-") + 1);
			long ticks = Long.valueOf(strTicks);
			long requestTimeInMiliseconds = (ticks - TICKS_AT_EPOCH)
					/ TICKS_PER_MILLISECOND;

			// a string de autenticação apenas é válida por DELTA segundos
			// depois de gerada.
			if ((currentTimeInMilliseconds - requestTimeInMiliseconds) <= DELTA)
				userName = authDEncStr.substring(0, authDEncStr.indexOf("-"));
			else
				throw new AutoLoginException("Time Exceeded");
		}

		try {
			user = UserLocalServiceUtil
					.getUserByScreenName(companyId, userName);
		} catch (NoSuchUserException e) {
			throw new AutoLoginException("Invalid User", e);
		} catch (PortalException e2) {
			throw new AutoLoginException(e2);
		} catch (SystemException e3) {
			throw new AutoLoginException(e3);
		}

		if (user != null) {
			long userId = user.getUserId();
			String password = user.getPassword();
			credentials = new String[3];
			credentials[0] = Long.toString(userId);
			credentials[1] = password;
			credentials[2] = Boolean.TRUE.toString();

			return credentials;
		}
	}
}