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Note that LogOn and LogOff Web methods (not shown here) do not have the SoapSecurity extension applied to them This is because a user must first call LogOn to get the session id, so you can t require that the request to LogOn already have a valid session id! LogOff could require a valid SessionId header but it already takes the SessionId as a parameter so that would be redundant Combining this SOAP extension with the LogOn and LogOff methods you have an infrastructure that provides authentication and authorization for Web services Some of the ways you can improve on this include writing a SQL Server job to clean out old sessions and adding more sophisticated authorization

Now when we view our test page, our HoverCard works as it did before and is positioned correctly But (there s always a but, isn t there ), we caused ourselves a hidden problem We caused the problem by moving the HoverCard from its original DOM location and therefore it won t automatically be destroyed when it is contained within an updating UpdatePanel Listing 719 sets up this situation by updating our page s markup and wrapping our HoverCard in an UpdatePanel

private boolean shouldDecode = false;

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logic to suit your needs You could also implement some extra safety mechanisms such as digitally signing the session id This would allow you to check the authenticity of the session id that you receive with each request before you hit the database for to check that the session is valid To give you the big picture of what we just did, figure 10-8 shows a class diagram of the Weather service implementing security The Web service itself needs to expose LogOn and LogOff Web methods, these are not part of the infrastructure A client must first call LogOn supplying a user id and password to get a new session id

public StringNode( StringBuffer textBuffer, int textBegin, int textEnd, boolean shouldDecode) { this(textBuffer, textBegin, textEnd);

<asp:UpdatePanel ID="UP1" runat="server" UpdateMode="Conditional"> <ContentTemplate> <div style="position: absolute; top: 50px; left: 50px; height: 200px; width: 200px; border: solid 1px black;"> <cc1:HoverCard ID="HC" runat="server" /> </div> <asp:Button ID="tstButton" Text="Update" runat="server" /> </ContentTemplate> </asp:UpdatePanel>

thisshouldDecode = shouldDecode;

The next SOAP extension we ll build is for usage accounting or metering The idea is to intercept each incoming request and log it to the AccountUsage database table with the userid, method name, and time of request It would also be nice if the extension could optionally log the time that the response was sent back to the client That way you also get an idea of how long each method invocation took Listing 10-8 shows the Accounting SOAP extension implementation Listing 10-8 The usage accounting SOAP extension (VBWSBook\10\Infrastructure\Accountingvb)

When we initially run the page, the HoverCard is displayed properly and we re able to move it about Figure 717 displays the initial view of the page

(shouldDecode)

However, when we cause the UpdatePanel to update by clicking the Update button, we receive a JavaScript error Figure 718 shows the error that we received The error states that Two components with the same id HCDrag PanelExtender can t be added to the application This is essentially telling us that there is a component with the ID HCDragPanelExtender already in SysApplication s list of managed components and that we re trying to add a second one Adding more than one component to SysApplication with the same ID is illegal, as we covered in 4, SysApplication

Public Structure AccountingExtensionConfig Public ConnStr As String Public LogResponse As Boolean End Structure

result = Translatedecode(result); return result; }

If we click Continue on our Visual Studio JavaScript error prompt, we receive a second error, shown in Figure 719: Two components with the same id HC can t be added to the application This second error messages indicates that we have another con ict

To self-encapsulate shouldDecode, I make the following changes:

Public Overloads Overrides Function GetInitializer( _ ByVal serviceType As SystemType) As Object 'if configured in webconfig, this method is called just once Return Nothing End Function

public class StringNode extends AbstractNode public StringNode( StringBuffer textBuffer, int textBegin, int textEnd, boolean shouldDecode) { this(textBuffer, textBegin, textEnd);

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