/*
    * Licensed under the GPL License. You may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *   https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
    *
    * THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
    * WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
    * PURPOSE.
   */
  package psiprobe.tools;
  
  import java.util.Collection;
  
  import javax.servlet.ServletContext;
  
  import org.springframework.security.core.GrantedAuthority;
  import org.springframework.security.core.context.SecurityContextHolder;
  
  /**
   * The Class SecurityUtils.
   */
  public final class SecurityUtils {
  
    /**
     * Prevent Instantiation of security utils.
     */
    private SecurityUtils() {
      // Prevent Instantiation
    }
  
    /**
     * Checks for attribute value role.
     *
     * @param servletContext the servlet context
     *
     * @return true, if successful
     */
    public static boolean hasAttributeValueRole(ServletContext servletContext) {
  
      String[] privilegedRoles = getPrivilegedRoles(servletContext).split(",", -1);
      for (String privilegedRole : privilegedRoles) {
        if (userHasRole(privilegedRole)) {
          return true;
        }
      }
      return false;
    }
  
    /**
     * User has role.
     *
     * @param privilegedRole the privileged role
     *
     * @return true, if successful
     */
    private static boolean userHasRole(String privilegedRole) {
      Collection<? extends GrantedAuthority> authorities =
          SecurityContextHolder.getContext().getAuthentication().getAuthorities();
  
      boolean result = false;
      for (GrantedAuthority authority : authorities) {
        if (privilegedRole.equals(authority.getAuthority())) {
          result = true;
          break;
        }
      }
      return result;
    }
  
    /**
     * Gets the privileged roles.
     *
     * @param servletContext the servlet context
     *
     * @return the privileged roles
     */
    private static String getPrivilegedRoles(ServletContext servletContext) {
      return servletContext.getInitParameter("attribute.value.roles");
    }
  
  }