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This chapter demonstrates how to integrate a portlet with a Single Sign-On solution using Kerberos as an example. We also discuss many of the other authentication and authorization technologies that are available to a portlet developer.

var a = myDate.localeFormat("d");

The form consists of a single MenuStrip control. The menu items are stored in an XML file as shown in Listing 7-14. Save this file as menus.xml in your application s Bin\Debug folder. Listing 7-14. XML File Representing the Menu Structure < xml version="1.0" encoding="utf-8" > <menus> <topmenu text="File"> <submenu>New</submenu> <submenu>Open</submenu> <submenu>Close</submenu> </topmenu> <topmenu text="Edit"> <submenu>Cut</submenu> <submenu>Copy</submenu> <submenu>Paste</submenu> </topmenu> <topmenu text="Help"> <submenu>Help</submenu> <submenu>Search</submenu> <submenu>About</submenu> </topmenu> </menus> The root element of the XML file is <menus>. Inside there can be zero or more <topmenu> items, which represent the top-level menu items. The text attribute of <topmenu> indicates the text of that menu. The <topmenu> element can contain zero or more <submenu> elements, which indicate submenus of the top-level menus. The text of the submenus is specified in the <submenu> element s value. Let s see how this file can be loaded in a DataSet and how the data can be accessed. Listing 7-15 shows the Load event handler of the form with the required code.

You ll learn how a portlet can incorporate syndicated links from other sites and how an application can present its own links to similarly capable external sites.

The parseLocale function allows you to create a locale-specific string by specifying the format. It takes two parameters: the date value and the format that you want the date to be formatted in.

that is authenticated as login/java with the password MyPassword . All authentication is carried out against a Kerberos KDC called jetspeed where all users are members of the realm JETSPEED . You should run the server before starting the client, and you should place a copy of the configuration file Kerberos.config in the same directory as the applications.

Listing 7-15. Adding Menu Items Dynamically private void Form1_Load(object sender, EventArgs e) { DataSet ds = new DataSet(); ds.ReadXml(Application.StartupPath + @"\menus.xml"); foreach (DataRow topmenu in ds.Tables[0].Rows) { ToolStripMenuItem item = new ToolStripMenuItem(topmenu["text"].ToString()); menuStrip1.Items.Add(item); DataRow[] submenus= topmenu.GetChildRows(ds.Relations[0]); foreach (DataRow submenu in submenus) { item.DropDownItems.Add(submenu[0].ToString()); } } } The code creates a new DataSet and reads the menus.xml file that we created earlier. While reading this file, the DataSet does some interesting things: 1. It observes the nesting of the XML data in the file and creates two DataTable objects. The first DataTable stores all the top menus, and the second DataTable stores all the submenus. 2. It creates DataRow objects in the top-menu DataTable and adds a DataColumn to them. The value contained in these columns is the value of the text attribute of the <topmenu> element. 3. It does a similar thing for the submenus DataTable, but loads the element values of the <submenu> items in the column. 4. It sets a DataRelation between the two tables by automatically adding an integer column to both of these DataTable objects.

TIP Running this code with some Kerberos servers, you may encounter the following error message:

var a = Date.parseLocale('2007-12-1', 'yyyy-mm-dd');

The code then iterates through all the rows from the first DataTable (the DataTable storing the top menus) and adds ToolStripMenuItem objects to the MenuStrip. The GetChildRows() method is called on each DataRow of the top-menu DataTable. This method accepts a DataRelation object and returns all the DataRow objects from the child table matching that relationship. In our case, the submenu DataTable is the child DataTable. The return value of GetChildRows() is an array of DataRow objects. The second foreach loop iterates through all the elements of this array and adds subitems to the DropDownItems collection of the ToolStripMenuItem class. If you run the application, you should see something similar to Figure 7-12.

GSSException: Failure unspecified at GSS-API level (Mechanism level: KDC has no support for encryption type (14)) In this case you will need to define the encryption mechanism for your principals (users) as des-cbc-crc:normal . The error is caused by an incompatibility between the Java GSS implementation and the Kerberos server.