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The WSE-enabled service examines the supplied token and validates it immediately. The default authentication provider that s included with the WSE uses Windows authentication, which means it extracts the user name and password from the SOAP header and uses it to log the user in under a Windows account. If the token doesn t map to a valid Windows account, an error message is returned to the client. However, if no token is supplied, no error occurs. It s up to you to check for this condition on the web server in order to restrict access to specific web methods. Unfortunately, the WSE isn t integrated in such a way that it can use the User object. Instead, you need to retrieve the tokens from the current context. The WSE provides a RequestSoapContext. Using the RequestSoapContext.Current property, you can retrieve an instance of the SoapContext class that represents the last received message. You can then examine the SoapContext.Security.Tokens collection. To simplify this task, it helps to create a private method like the one shown here. It checks that a token exists and throws an exception if it doesn t. Otherwise, it returns the user name. Private Function GetUsernameToken() As String ' Although there may be many tokens, only one of these ' will be a UsernameToken. For Each token As UsernameToken In RequestSoapContext.Current.Security.Tokens Return token.Username Next token Throw New SecurityException("Missing security token") End Function You could call the GetUsernameToken() method at the beginning of a web method to ensure that security is in effect. Overall, this is a good approach to enforce security. However, it s important to keep its limitations in mind. First, it doesn t support hashing or encrypting the user credentials.

When you wish to handle events for your page, you will need to update your <script> block or codebehind file with an appropriate event handler. However, if you examine the <%@Page%> directive, you will notice a specific attribute named AutoEventWireUp, which, by default, is set to true: <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

package com.apress.flexjava.usermanager.control { import com.apress.flexjava.usermanager.model.User; public interface UserControl { function addUser(user:User) : void; function updateUser(user:User) : void; function getUsers() : void; function getUserByUsername(username:String) : void; } }

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With this default behavior, each page-level event handler will automatically be handled if you enter the appropriately named method. However, if you disable AutoPageWireUp by setting this attribute to false <%@ Page Language="C#" AutoEventWireup="false" CodeFile="Default.aspx.cs" Inherits="_Default" %> the page-level events will no longer be captured. As its name suggests, this attribute (when enabled) will generate the necessary event riggings within the autogenerated partial class described earlier in this chapter. Even if you disable AutoEventWireup, you can still process page-level events by making use of C# event-handling logic, for example: public _Default() { // Explicitly hook into the Load and Unload events. this.Load += new Page_Load; this.Unload += new Page_Unload; } As you might suspect, you will usually leave AutoEventWireup enabled.

Also, it doesn t support more advanced Windows authentication protocols such as Digest authentication and Integrated Windows authentication. That s because the authentication is implemented by the WSE extensions, not by IIS. Similarly, the client always needs to submit a password and user name. The client has no way to automatically submit the credentials of the current user, as demonstrated earlier in this chapter with the CredentialCache object. In fact, the Credentials property of the proxy is ignored completely. Fortunately, you aren t limited to the scaled-down form of Windows authentication provided by the default WSE authentication service. You can also create your own authentication logic, as described in the next section.

Another event that may occur during your page s life cycle is Error. This event will be fired if a method on the Page-derived type triggered an exception that was not explicitly handled. Assume that you have handled the Click event for a given Button on your page, and within the event handler (which I named btnGetFile_Click), you attempt to write out the contents of a local file to the HTTP response. Also assume you have failed to test for the presence of this file via standard structured exception handling. If you have rigged up the page s Error event in the default constructor, you have one final chance to deal with the problem on this page before the end user finds an ugly error. Consider the following code: public partial class _Default : System.Web.UI.Page { void Page_Error(object sender, EventArgs e) { Response.Clear(); Response.Write("I am sorry...I can't find a required file.<br>"); Response.Write(string.Format("The error was: <b>{0}</b>", Server.GetLastError().Message)); Server.ClearError(); } protected void Page_Load(object sender, EventArgs e) { Response.Write("Load event fired!"); } protected void Page_Unload(object sender, EventArgs e) {

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