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Security plays an important part in any network, and quite often, we need to work with files that require authenticating before accessing them. The .NET Framework and System.Net.WebClient, for that matter, support the World Wide Web Consortium defined HTTP authentication mechanisms plus NTLM (NT LAN Manager) authentication, also known as Windows-integrated authentication. We really need minimal effort to configure our client with the proper credentials. Before setting up credentials, let s first see what happens if we try to access a protected resource without passing the correct credentials. We will use the test page from http://www. pagetutor.com for demonstration purposes; the protected area is at the http://www.pagetutor.com/ keeper/mystash/secretstuff.html URL. Let s first request it with a normal browser like Internet Explorer. Figure 17-5 shows the password prompt that we get. Let s see how System.Net.WebClient handles that: PS> $url = "http://www.pagetutor.com/keeper/mystash/secretstuff.html" PS> .\Get-Url.ps1 $url Exception calling "DownloadString" with "1" argument(s): "The remote s erver returned an error: (401) Unauthorized." At Z:\18 - The Internet\Get-Url.ps1:22 char:39 + $contents = $client.DownloadString( <<<< $Url)

Note The classes presented in this section are not quite ready for production use but are a good starting point. For instance, the manager class handles most of the workflow runtime events by raising its own event with a formatted message. The host application simply handles this event and writes this message to the Console class. You might want to handle some of those events in a different way. However, these classes are a good starting point and represent a big improvement over the previous example.

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Figure 5-16. AppFabric Caching Service configuration Store 13. On the Windows Server AppFabric Caching Service configuration Store page, check the Register AppFabric Caching Service configuration database check box to register the configuration database identified by the connection string by adding its configuration to the root web.config file, and to set the security configuration. This registration makes the connection string and behavior available at all scopes on the computer. 14. Check the Create AppFabric Caching Service configuration database check box to create the configuration database and to specify the connection string or the database name. 15. Click OK to apply the selected settings for the AppFabric Caching Service configuration. Click Yes in the confirmation dialog box. After verifying that the Caching Service configuration database was created and registered successfully, the AppFabric Caching Service Configuration page will be closed, and you will be returned back to the Configure Caching Service page.

Figure 17-5. Internet Explorer shows this password prompt when a page requiring authentication is requested. The System.Net.WebClient class is not a user interface component, and it cannot react with a password prompt. The best it can do is throw an error at us. From the error message, we can see the HTTP status code of 401, which means that we are not authorized to access the resource. We will now extend our Get-Url.ps1 script with support for HTTP authentication. To do that, we have to create a System.Net.NetworkCredential object, initialize it with the user name and password, and pass that object to the Credentials property of the WebClient object. We will extend the script with two additional parameters: $UserName and $Password. The script will create the NetworkCredential object if and only if both of those parameters have been provided. Here is the code: param ($Url, $FileName, $Proxy, $Headers = @{}, $UserName, $Password) $client = New-Object System.Net.WebClient if ($Proxy) { $proxyConfig = New-Object System.Net.WebProxy -arg $Proxy $client.Proxy = $proxyConfig } foreach ($headerName in $Headers.Keys) { $client.Headers.Add($headerName, $Headers[$headerName]) }

The first class that you ll implement wraps the WorkflowInstance class provided by WF. The wrapper class is used to encapsulate each workflow instance, isolating its state from other instances. For example, the Program class instance variables used in the previous example (the wait handle and the output parameters) are moved into this wrapper. This is one small step toward supporting the execution of multiple workflows at the same time. Add a new class to the Bukovics.Workflow.Hosting project and name it WorkflowInstanceWrapper. This is just an ordinary C# class, not a workflow class. The complete code for this class is shown in Listing 4-3 and discussed following the listing. Listing 4-3. Complete WorkflowInstanceWrapper.cs File using using using using System; System.Threading; System.Collections.Generic; System.Workflow.Runtime;

namespace Bukovics.Workflow.Hosting { /// <summary> /// A container for a workflow instance /// </summary> [Serializable] public class WorkflowInstanceWrapper { private WorkflowInstance _workflowInstance; private ManualResetEvent _waitHandle = new ManualResetEvent(false); private Dictionary<String, Object> _outputParameters = new Dictionary<string, object>(); private Exception _exception; private String _reasonSuspended = String.Empty;

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