//
   //  ========================================================================
   //  Copyright (c) 1995-2013 Mort Bay Consulting Pty. Ltd.
   //  ------------------------------------------------------------------------
   //  All rights reserved. This program and the accompanying materials
   //  are made available under the terms of the Eclipse Public License v1.0
   //  and Apache License v2.0 which accompanies this distribution.
   //
   //      The Eclipse Public License is available at
  //      http://www.eclipse.org/legal/epl-v10.html
  //
  //      The Apache License v2.0 is available at
  //      http://www.opensource.org/licenses/apache2.0.php
  //
  //  You may elect to redistribute this code under either of these licenses.
  //  ========================================================================
  //
  
  package org.eclipse.jetty.util.security;
  
  import java.io.Serializable;
  import java.util.Arrays;
  
  /* ------------------------------------------------------------ */
  /**
   * Describe an auth and/or data constraint.
   * 
   * 
   */
  public class Constraint implements Cloneable, Serializable
  {
      /* ------------------------------------------------------------ */
      public final static String __BASIC_AUTH = "BASIC";
  
      public final static String __FORM_AUTH = "FORM";
  
      public final static String __DIGEST_AUTH = "DIGEST";
  
      public final static String __CERT_AUTH = "CLIENT_CERT";
  
      public final static String __CERT_AUTH2 = "CLIENT-CERT";
      
      public final static String __SPNEGO_AUTH = "SPNEGO";
      
      public final static String __NEGOTIATE_AUTH = "NEGOTIATE";
      
      public static boolean validateMethod (String method)
      {
          if (method == null)
              return false;
          method = method.trim();
          return (method.equals(__FORM_AUTH) 
                  || method.equals(__BASIC_AUTH) 
                  || method.equals (__DIGEST_AUTH) 
                  || method.equals (__CERT_AUTH) 
                  || method.equals(__CERT_AUTH2)
                  || method.equals(__SPNEGO_AUTH)
                  || method.equals(__NEGOTIATE_AUTH));
      }
  
      /* ------------------------------------------------------------ */
      public final static int DC_UNSET = -1, DC_NONE = 0, DC_INTEGRAL = 1, DC_CONFIDENTIAL = 2, DC_FORBIDDEN = 3;
  
      /* ------------------------------------------------------------ */
      public final static String NONE = "NONE";
  
      public final static String ANY_ROLE = "*";
  
      /* ------------------------------------------------------------ */
      private String _name;
  
      private String[] _roles;
  
      private int _dataConstraint = DC_UNSET;
  
      private boolean _anyRole = false;
  
      private boolean _authenticate = false;
  
      /* ------------------------------------------------------------ */
      /**
       * Constructor.
       */
      public Constraint()
      {
      }
  
      /* ------------------------------------------------------------ */
      /**
       * Conveniance Constructor.
       * 
       * @param name
       * @param role
       */
      public Constraint(String name, String role)
      {
          setName(name);
          setRoles(new String[] { role });
      }
 
     /* ------------------------------------------------------------ */
     @Override
     public Object clone() throws CloneNotSupportedException
     {
         return super.clone();
     }
 
     /* ------------------------------------------------------------ */
     /**
      * @param name
      */
     public void setName(String name)
     {
         _name = name;
     }
 
     /* ------------------------------------------------------------ */
     public void setRoles(String[] roles)
     {
         _roles = roles;
         _anyRole = false;
         if (roles != null) 
             for (int i = roles.length; !_anyRole && i-- > 0;)
                 _anyRole |= ANY_ROLE.equals(roles[i]);
     }
 
     /* ------------------------------------------------------------ */
     /**
      * @return True if any user role is permitted.
      */
     public boolean isAnyRole()
     {
         return _anyRole;
     }
 
     /* ------------------------------------------------------------ */
     /**
      * @return List of roles for this constraint.
      */
     public String[] getRoles()
     {
         return _roles;
     }
 
     /* ------------------------------------------------------------ */
     /**
      * @param role
      * @return True if the constraint contains the role.
      */
     public boolean hasRole(String role)
     {
         if (_anyRole) return true;
         if (_roles != null) for (int i = _roles.length; i-- > 0;)
             if (role.equals(_roles[i])) return true;
         return false;
     }
 
     /* ------------------------------------------------------------ */
     /**
      * @param authenticate True if users must be authenticated
      */
     public void setAuthenticate(boolean authenticate)
     {
         _authenticate = authenticate;
     }
 
     /* ------------------------------------------------------------ */
     /**
      * @return True if the constraint requires request authentication
      */
     public boolean getAuthenticate()
     {
         return _authenticate;
     }
 
     /* ------------------------------------------------------------ */
     /**
      * @return True if authentication required but no roles set
      */
     public boolean isForbidden()
     {
         return _authenticate && !_anyRole && (_roles == null || _roles.length == 0);
     }
 
     /* ------------------------------------------------------------ */
     /**
      * @param c Data constrain indicator: 0=DC+NONE, 1=DC_INTEGRAL &
      *                2=DC_CONFIDENTIAL
      */
     public void setDataConstraint(int c)
     {
         if (c < 0 || c > DC_CONFIDENTIAL) throw new IllegalArgumentException("Constraint out of range");
         _dataConstraint = c;
     }
 
     /* ------------------------------------------------------------ */
     /**
      * @return Data constrain indicator: 0=DC+NONE, 1=DC_INTEGRAL &
      *         2=DC_CONFIDENTIAL
      */
     public int getDataConstraint()
     {
         return _dataConstraint;
     }
 
     /* ------------------------------------------------------------ */
     /**
      * @return True if a data constraint has been set.
      */
     public boolean hasDataConstraint()
     {
         return _dataConstraint >= DC_NONE;
     }
 
     /* ------------------------------------------------------------ */
     @Override
     public String toString()
     {
         return "SC{" + _name
                + ","
                + (_anyRole ? "*" : (_roles == null ? "-" : Arrays.asList(_roles).toString()))
                + ","
                + (_dataConstraint == DC_UNSET ? "DC_UNSET}" : (_dataConstraint == DC_NONE ? "NONE}" : (_dataConstraint == DC_INTEGRAL ? "INTEGRAL}" : "CONFIDENTIAL}")));
     }
 
 }