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The server-side code for the Ajax portal is simple in nature, but it will have numerous steps by the time we get finished because of all the functionality that the portal contains. Right now, we are concerned with coding the login portion of the Ajax portal. Let s review the process. When the user logs into the portal, the client-side code sends a request to the server, passing the user s credentials with the request. The server-side process that intercepts this request will determine whether the credentials that were sent to the server are correct. If they are correct, we start to process the building of the portal windows. If the user s credentials are incorrect, we pass an error message back to the client page. Because we are developing in Java, we ll use a servlet filter to secure all our interactions with the server. To those unfamiliar with the term, a filter is simply a bit of logic that can be assigned to one or more resources, which is given the opportunity to modify a request before it reaches its destination servlet. We discussed using filters for security in chapter 7. If you re using a system that doesn t support filters, you can simply create a helper object or function that checks to see whether the user is logged in and invoke it manually at the top of each page that you want to protect. Listing 11.2 shows our login filter.

The former two are primarily the ones we re interested in. You can have a login hook that creates your symbolic links at login, but then destroys them at logout. Once you have created your MCXRedirector key under the always target, you want to set the key Login Redirections. With the new Login Redirections key highlighted, you create yet another key, which is used to define your redirect actions and paths. The redirection system provides you with four actions to choose from:

public class LoginFilter implements Filter { public void init(FilterConfig config) throws ServletException { } public void doFilter( ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException { boolean accept=false; HttpSession session=( (HttpServletRequest)request).getSession(); User user=(User) (session.getAttribute("user")); Check session for User object if (user==null){ accept=login(request); Authenticate request }else{ accept=true; Let them in } if (accept){ filterChain.doFilter (request,response); Proceed }else{ Writer writer=response.getWriter(); writer.write (JSUtil.getLoginError()); Return error code writer.flush(); writer.close(); } }

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This causes Directory Service to quit and relaunch. Upon relaunching, Directory Service will re-read all the .plist files in the local directory nodes. NOTE: Our technical reviewer assures us that killall -HUP DirectoryService works as well in most cases, and avoids terminating the Directory Service process. Even after forcing Directory Service to re-read all its local data, managed preferences settings that you have changed may not be applied until the current user logs out and back in. NOTE: This behavior is not unique to Local MCX. Most managed preferences changes don t take effect until the next login, or until mcxrefresh is executed.

folder, prepending Network to the name of the directory. After renaming, it creates a symbolic link to the specified local path. Unfortunately, due to the lack of consistent logout cleanup, I recommend avoiding this option and instead utilizing a login hook, which gives you much more flexability. However, this option can be used instead of deleteAndCreateSymLink to ensure that you avoid deleting user data.

private boolean login(ServletRequest request){ String user=request .getParameter("username"); Get credentials String password=request from request .getParameter("password"); User userObj=findUser(user,password); if (userObj!=null){ HttpSession session= ((HttpServletRequest)request).getSession(true); session.setAttribute("user",userObj); Store in session for future use } return (userObj!=null); }

private User findUser(String user, String password) { User userObj=null; Connection conn=DBUtil.getConnection();

deletePath: This action simply deletes any item at the specified path. deleteSymLinkAndRestore: This action is the counterpart to

try{ String sql="SELECT id FROM users WHERE username='" +user+"' AND password='"+password+"'"; Build SQL statement Statement stmt=conn.createStatement(); ResultSet rs=stmt.executeQuery(sql); if (rs.next()){ int id=rs.getInt("id"); userObj=new User(id,user); Create User object } }catch (SQLException sqlex){

renameAndCreateSymLink. Essentially, it will delete the existing symbolic link and restore the previously renamed directory. Unfortunately, this option does not function reliably. For this type of functionality, I recommend implementing a login hook. For these purposes, you are going to choose the second option. This allows you to maintain a network version of the redirected folder, but promotes local storage for the primary folder itself. Thus, if you were to perform redirection of the Movies folder because your users utilize iMovie, then they will have the ability to access their network movies folder at ~/Movies (Network). This provides your users with the ability to manually copy files to the network folder to facilitate migration to a different machine. At the same time, it relieves the burden of iMovie s heavy data usage from your server. While a user s movie media may not seamlessly transfer with them like the rest of their homefolder, it is an acceptable compromise in many environments. To finish the policy creation, you will specify your Folder Path, which is ~/Library/Movies. You also want to specify the Destination Folder Path key, which signifies the local path that will house your data. For this, you enter in a value of /Users/%@/Movies. As discussed in 8, %@ is a variable for your user s

} return userObj; } public void destroy() { }

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