jforum example source code file (Comment.jsp)

This example jforum source code file (Comment.jsp) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - jforum tags/keywords

cookie, date, page, page, pagelock, pagelock, simpledateformat, string, string, stringbuffer, user, wikipage, wikipage, wikisession

The jforum Comment.jsp source code

<%@ page import="org.apache.log4j.*" %>
<%@ page import="com.ecyrd.jspwiki.*" %>
<%@ page import="com.ecyrd.jspwiki.filters.*" %>
<%@ page import="java.util.*" %>
<%@ page import="java.text.SimpleDateFormat" %>
<%@ page import="com.ecyrd.jspwiki.ui.EditorManager" %>
<%@ page import="com.ecyrd.jspwiki.util.HttpUtil" %>
<%@ page import="com.ecyrd.jspwiki.auth.login.CookieAssertionLoginModule" %>
<%@ page errorPage="/Error.jsp" %>
<%@ page import="javax.servlet.http.Cookie" %>
<%@ taglib uri="/WEB-INF/jspwiki.tld" prefix="wiki" %>

<%! 
    public void jspInit()
    {
        wiki = WikiEngine.getInstance( getServletConfig() );
    }

    Logger log = Logger.getLogger("JSPWiki");
    WikiEngine wiki;
%>

<%
    // Create wiki context and check for authorization
    WikiContext wikiContext = wiki.createContext( request, WikiContext.COMMENT );
    if( !wikiContext.hasAccess( response ) ) return;
    String pagereq = wikiContext.getName();
    
    WikiSession wikiSession = wikiContext.getWikiSession(); 
    String storedUser = wikiSession.getUserPrincipal().getName();

    if ( wikiSession.isAnonymous() ) 
    {
        storedUser  = request.getParameter( "author" );
    }

    String ok      = request.getParameter("ok");
    String preview = request.getParameter("preview");
    String cancel  = request.getParameter("cancel");
    String author  = request.getParameter("author");
    String link    = request.getParameter("link");
    String remember = request.getParameter("remember");
    String changenote = request.getParameter( "changenote" );
    
    WikiPage wikipage = wikiContext.getPage();
    WikiPage latestversion = wiki.getPage( pagereq );
    if( latestversion == null )
    {
        latestversion = wikiContext.getPage();
    }

    //
    //  Setup everything for the editors and possible preview.  We store everything in the
    //  session.
    //
    
    if( remember == null )
    {
        remember = (String)session.getAttribute("remember");
    }

    if( remember == null ) remember = "false";
    
    session.setAttribute("remember",remember);
    
    if( author == null )
    {
        author = storedUser;
    }    
    if( author == null || author.length() == 0 ) author = "AnonymousCoward";

    session.setAttribute("author",author);
    
    if( link == null )
    {
        link = HttpUtil.retrieveCookieValue( request, "link" );
        if( link == null ) link = "";
    }
    
    session.setAttribute( "link", link );

    //
    //  Branch
    //
    log.debug("preview="+preview+", ok="+ok);

    if( ok != null )
    {
        log.info("Saving page "+pagereq+". User="+storedUser+", host="+request.getRemoteAddr() );

        //  Modifications are written here before actual saving
        
        WikiPage modifiedPage = (WikiPage)wikiContext.getPage().clone();

        //  FIXME: I am not entirely sure if the JSP page is the
        //  best place to check for concurrent changes.  It certainly
        //  is the best place to show errors, though.
       
        long pagedate   = Long.parseLong(request.getParameter("edittime"));

        Date change = latestversion.getLastModified();

        if( change != null && change.getTime() != pagedate )
        {
            //
            // Someone changed the page while we were editing it!
            //

            log.info("Page changed, warning user.");

            pageContext.forward( "PageModified.jsp" );
            return;
        }

        //
        //  We expire ALL locks at this moment, simply because someone has
        //  already broken it.
        //
        PageLock lock = wiki.getPageManager().getCurrentLock( wikipage );
        wiki.getPageManager().unlockPage( lock );
        session.removeAttribute( "lock-"+pagereq );

        //
        //  Set author and changenote information
        //

        modifiedPage.setAuthor( storedUser );

        if( changenote == null ) changenote = (String) session.getAttribute("changenote");
        
        session.removeAttribute("changenote");
        
        modifiedPage.setAttribute( WikiPage.CHANGENOTE, "Comment by "+storedUser );

        //
        //  Build comment part
        //
            
        StringBuffer pageText = new StringBuffer(wiki.getPureText( wikipage ));

        log.debug("Page initial contents are "+pageText.length()+" chars");

        //
        //  Add a line on top only if we need to separate it from the content.
        //
        if( pageText.length() > 0 )
        {
            pageText.append( "\n\n----\n\n" );
        }        

        pageText.append( EditorManager.getEditedText(pageContext) );

        log.debug("Author name ="+author);
        if( author != null && author.length() > 0 )
        {
            String signature = author;
            
            if( link != null && link.length() > 0 )
            {
                link = HttpUtil.guessValidURI( link );
                
                signature = "["+author+"|"+link+"]";
            }
            
            Calendar cal = Calendar.getInstance();
            SimpleDateFormat fmt = new SimpleDateFormat("dd-MMM-yyyy");

            pageText.append("\n\n--"+signature+", "+fmt.format(cal.getTime()));
        }

        if( TextUtil.isPositive(remember) )
        {
            if( link != null )
            {
                Cookie linkcookie = new Cookie("link", link);
                linkcookie.setMaxAge(1001*24*60*60);
                response.addCookie( linkcookie );
            }

            CookieAssertionLoginModule.setUserCookie( response, author );            
        }
        else
        {
            session.removeAttribute("link");
            session.removeAttribute("author");
        }

        try
        {
            wikiContext.setPage( modifiedPage );
            wiki.saveText( wikiContext, pageText.toString() );
        }
        catch( RedirectException e )
        {
            session.setAttribute( VariableManager.VAR_MSG, e.getMessage() );
            response.sendRedirect( e.getRedirect() );
            return;
        }
        response.sendRedirect(wiki.getViewURL(pagereq));
        return;
    }
    else if( preview != null )
    {
        log.debug("Previewing "+pagereq);
        pageContext.forward( "Preview.jsp?action=comment" );
        return;
    }
    else if( cancel != null )
    {
        log.debug("Cancelled editing "+pagereq);
        PageLock lock = (PageLock) session.getAttribute( "lock-"+pagereq );

        if( lock != null )
        {
            wiki.getPageManager().unlockPage( lock );
            session.removeAttribute( "lock-"+pagereq );
        }
        response.sendRedirect( wiki.getViewURL(pagereq) );
        return;
    }

    log.info("Commenting page "+pagereq+". User="+request.getRemoteUser()+", host="+request.getRemoteAddr() );

    //
    //  Determine and store the date the latest version was changed.  Since
    //  the newest version is the one that is changed, we need to track
    //  that instead of the edited version.
    //
    long lastchange = 0;
    
    Date d = latestversion.getLastModified();
    if( d != null ) lastchange = d.getTime();

    pageContext.setAttribute( "lastchange",
                              Long.toString( lastchange ),
                              PageContext.REQUEST_SCOPE );

    //  This is a hack to get the preview to work.
    pageContext.setAttribute( "comment", Boolean.TRUE, PageContext.REQUEST_SCOPE );
	
    //
    //  Attempt to lock the page.
    //
    PageLock lock = wiki.getPageManager().lockPage( wikipage, 
                                                    storedUser );

    if( lock != null )
    {
        session.setAttribute( "lock-"+pagereq, lock );
    }

    // Set the content type and include the response content
    response.setContentType("text/html; charset="+wiki.getContentEncoding() );
    response.setHeader( "Cache-control", "max-age=0" );
    response.setDateHeader( "Expires", new Date().getTime() );
    response.setDateHeader( "Last-Modified", new Date().getTime() );
    String contentPage = wiki.getTemplateManager().findJSP( pageContext,
                                                            wikiContext.getTemplate(),
                                                            "EditTemplate.jsp" );

%><wiki:Include page="<%=contentPage%>" />