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/*
 * Beangle, Agile Java/Scala Development Scaffold and Toolkit
 *
 * Copyright (c) 2005-2013, Beangle Software.
 *
 * Beangle 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 3 of the License, or
 * (at your option) any later version.
 *
 * Beangle 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 Beangle.  If not, see .
 */
package org.beangle.security.web.auth.preauth;

import java.util.Date;

import javax.servlet.http.HttpServletRequest;

import org.beangle.commons.lang.Option;
import org.beangle.commons.web.util.RequestUtils;
import org.beangle.security.codec.EncryptUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ParameterUsernameSource implements UsernameSource {

  private final static Logger logger = LoggerFactory.getLogger(ParameterUsernameSource.class);

  private boolean enableExpired = true;

  // default 10min second
  private int expiredTime = 600;

  private String timeParam = "t";

  private String userParam = "cid";

  private String digestParam = "s";

  private String extra = "123456!";

  public Option obtainUsername(HttpServletRequest request) {
    String ip = RequestUtils.getIpAddr(request);
    String cid = request.getParameter(userParam);
    String timeParamStr = request.getParameter(timeParam);
    Long t = null;
    if (null != timeParamStr) {
      t = Long.valueOf(timeParamStr);
    }
    String s = request.getParameter(digestParam);
    if (null == t || null == s || null == cid || null == ip) return Option.none();
    String full = cid + "," + ip + "," + t + "," + extra;
    String digest = EncryptUtil.encode(full, "MD5");
    if (logger.isDebugEnabled()) {
      logger.debug("user {} at :{}", cid, ip);
      logger.debug("time:{} digest:{} ", t, s);
      logger.debug("full:{}", full);
      logger.debug("my_digest:{}", digest);
    }
    if (digest.equals(s)) {
      long time = t.longValue() * 1000;
      Date now = new Date();
      if (enableExpired && (Math.abs(now.getTime() - time) > (expiredTime * 1000))) {
        logger.debug("user " + cid + " time expired:server time:{} and given time :{}", now, new Date(time));
        return Option.none();
      } else {
        logger.debug("user {} login at server time:{}", cid, now);
        return Option.some(cid);
      }
    } else {
      return Option.none();
    }
  }

  public boolean isEnableExpired() {
    return enableExpired;
  }

  public void setEnableExpired(boolean enableTime) {
    this.enableExpired = enableTime;
  }

  public int getExpiredTime() {
    return expiredTime;
  }

  public void setExpiredTime(int expiredTime) {
    this.expiredTime = expiredTime;
  }

  public String getTimeParam() {
    return timeParam;
  }

  public void setTimeParam(String timeParam) {
    this.timeParam = timeParam;
  }

  public String getUserParam() {
    return userParam;
  }

  public void setUserParam(String userParam) {
    this.userParam = userParam;
  }

  public String getDigestParam() {
    return digestParam;
  }

  public void setDigestParam(String digestParam) {
    this.digestParam = digestParam;
  }

  public String getExtra() {
    return extra;
  }

  public void setExtra(String extra) {
    this.extra = extra;
  }

}