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The Base web part class we create later will use this web service to determine whether to show or hide a given web part. With the base class in place, you can create a virtually unlimited number of targeted web parts and thus render the same web part page differently, depending on the needs and permissions of each visitor to that page.
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Returning a List of Active Directory Groups to Which the Current User Belongs
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AD is used to manage domain user accounts by Microsoft Windows Server and integrates closely with WSS. I assume that it is used to identify groups of users with like privileges or roles within your organization (for example, all Executive Committee members, or all Widget Division Customers ). Using AD in this way not only makes administering permissions in WSS easier, but also facilitates the targeting of custom web parts, as you ll see shortly. Figure 4-2 illustrates the various components of the authorization process that you will create.
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Figure 4-2. Authorization process flow The Base class will call the Authorization web service to obtain a list of AD groups to which the current user belongs. Then this web service will call the Authorization class, which in turn queries AD using the DirectoryServices .NET namespace to obtain a list of AD groups for the specified user, returning that list to the Base web part. This list will be returned as a DataSet to the Authorization class, service, and ultimately to the Base class. The Base class will then compare the list returned by the Authorization service against its own list to determine whether to display itself. If the web part should be displayed for the current user, the Base class will continue to execute; otherwise, it will hide itself. The custom web part, which inherits from Base, will check the CanAccess property exposed by the Base class; if the property is set to True, the web part will write the content to the page. Otherwise, the custom web part will simply skip writing itself to the page. The end result of this process is that when a web part s CanAccess property is False for a given user, the web part s content will not appear on the page.
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Note As Figure 4-2 indicates, you can insert other authentication processes as desired. Some examples
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could be to query a SQL Server database of user names and permissions, run a query against one of the SharePoint web services or objects, access an external accounting system, or execute any other process that would help you determine whether a particular web part should be viewable by a given user.
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Creating the Authorization Web Service
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To create the Authorization service, we will complete the following steps: 1. Create a web service project. 2. Create a class to query AD. 3. Modify the web service to use the Authorization class. 4. Test the service.
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Create a Web Service Project
To start, you need to create a web service that accesses AD to return a list of AD groups for the current user. To do this, you will create a new Visual Studio ASP .NET Web Service project (see Figure 4-3). The figure shows the standard New Project dialog box with the ASP .NET Web Service template highlighted. This template provides a good starting point for developing a new web service.
Figure 4-3. Creating a web service project When you have successfully created the project in the Authorization solution, the Visual Studio Solution Explorer should appear, as shown in Figure 4-4.
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Figure 4-4. Solution Explorer window after adding projects
Note It is a best practice, when creating web services (such as the Authorization service), to place the
bulk of the logic in a separate class and retain only the code to expose the methods and properties of the class in the web service. This has the advantages of keeping the web service code straightforward and making the logic placed in the class library available for other web services in the library.
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