isauthorisedforblogtag.java

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/*
 * Copyright (c) 2003-2005, Simon Brown
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *
 *   - Neither the name of Pebble nor the names of its contributors may
 *     be used to endorse or promote products derived from this software
 *     without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package net.sourceforge.pebble.web.tagext;

import net.sourceforge.pebble.Constants;
import net.sourceforge.pebble.domain.Blog;
import net.sourceforge.pebble.domain.AbstractBlog;
import net.sourceforge.pebble.util.SecurityUtils;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;

/**
 * A custom tag that includes its body content if the current is authorised for
 * the given blog.
 *
 * @author    Simon Brown
 */
public class IsAuthorisedForBlogTag extends TagSupport {

  /**
   * Implementation from the Tag interface - this is called when the opening tag
   * is encountered.
   *
   * @return  an integer specifying what to do afterwards
   * @throws  javax.servlet.jsp.JspException    if something goes wrong
   */
  public int doStartTag() throws JspException {
    HttpServletRequest request = (HttpServletRequest)pageContext.getRequest();
    AbstractBlog abstractBlog = (AbstractBlog)request.getAttribute(Constants.BLOG_KEY);

    if (abstractBlog instanceof Blog) {
      Blog blog = (Blog)abstractBlog;
      if (SecurityUtils.isUserAuthorisedForBlog(blog)) {
        return EVAL_BODY_INCLUDE;
      }
    }

    return SKIP_BODY;
  }

}