/*
 * Copyright (c) 1998-2012 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source 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, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Sam
 */

package com.caucho.rewrite;

import javax.servlet.http.HttpServletRequest;

import com.caucho.config.Configurable;
import com.caucho.vfs.Path;
import com.caucho.vfs.Vfs;

/**
 * Match if the file specified by getRealPath() exists in the filesystem.
 *
 * <pre>
 * &lt;resin:Allow url-pattern="/admin/*"&gt;
 *                  xmlns:resin="urn:java:com.caucho.resin"&gt;
 *   &lt;resin:IfFileExists/>
 * &lt;/resin:Allow>
 * </pre>
 *
 * <p>RequestPredicates may be used for security and rewrite actions.
 */
@Configurable
public class IfFileExists implements RequestPredicate, CacheablePredicate
{
  /**
   * True if the predicate matches.
   *
   * @param request the servlet request to test
   */
  @Override
  public boolean isMatch(HttpServletRequest request)
  {
    String servletPath = request.getServletPath();
    String realPath;

    if (servletPath != null)
      realPath = request.getServletContext().getRealPath(servletPath);
    else
      realPath = request.getServletContext().getRealPath(request.getPathInfo());

    Path path = Vfs.lookup(realPath);

    return path.exists() && path.isFile();
  }
}
