package at.gv.egiz.eaaf.modules.pvp2.impl.utils;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.servlet.http.HttpServletRequest;

public class SamlHttpUtils {

  /**
   * Always read the last parameter with this name from request to get a strict
   * deterministic behavior. <br>
   * <br>
   * <b><i>If more than one parameters with the same name exists, this method
   * always select the last parameter value.</i></b>
   *
   * @param request   Incoming http request
   * @param paramName Name of the http parameter
   * @return the last parameter value with this name, or <code>null</code> if the
   *         parameter not exists
   */
  @Nullable
  public static String getLastParameterFromRequest(@Nonnull HttpServletRequest request,
      @Nonnull String paramName) {
    final String[] values = request.getParameterValues(paramName);
    if (values != null && values.length > 0) {
      return values[values.length - 1];

    }

    return null;

  }
}