c# – 保护Web服务？

<SoapHeader("Authentication",Required:=True)>

这是模块：

Imports System.Web
Imports System.Web.Services.Protocols


' http://msdn.microsoft.com/en-us/library/9z52by6a.aspx
' http://msdn.microsoft.com/en-us/library/9z52by6a(VS.80).aspx




' http://www.codeproject.com/KB/cpp/authforwebservices.aspx


' http://aleemkhan.wordpress.com/2007/09/18/using-wse-30-for-web-service-authentication/
' http://www.codeproject.com/KB/WCF/CustomUserNamePassAuth2.aspx
' http://www.codeproject.com/KB/WCF/CustomUserNamePassAuth2.aspx
' http://www.codeproject.com/KB/webservices/WS-Security.aspx




'Public NotInheritable Class WebServiceAuthenticationModule
Public Class WebServiceAuthenticationModule
    Implements System.Web.IHttpModule

    Protected Delegate Sub WebServiceAuthenticationEventHandler(ByVal sender As [Object],ByVal e As WebServiceAuthenticationEvent)
    Protected _eventHandler As WebServiceAuthenticationEventHandler = Nothing



    Protected Custom Event Authenticate As WebServiceAuthenticationEventHandler
        AddHandler(ByVal value As WebServiceAuthenticationEventHandler)
            _eventHandler = value
        End AddHandler
        RemoveHandler(ByVal value As WebServiceAuthenticationEventHandler)
            _eventHandler = value
        End RemoveHandler
        RaiseEvent(ByVal sender As Object,ByVal e As WebServiceAuthenticationEvent)
        End RaiseEvent
    End Event


    Protected app As HttpApplication


    Public Sub Init(ByVal context As System.Web.HttpApplication) Implements System.Web.IHttpModule.Init
        app = context

        context.Context.Response.Write("<h1>Test</h1>")

        AddHandler app.AuthenticateRequest,AddressOf Me.OnEnter
    End Sub


    Public Sub Dispose() Implements System.Web.IHttpModule.Dispose
        ' add clean-up code here if required
    End Sub


    Protected Sub OnAuthenticate(ByVal e As WebServiceAuthenticationEvent)
        If _eventHandler Is Nothing Then
            Return
        End If
        _eventHandler(Me,e)
        If Not (e.User Is Nothing) Then
            e.Context.User = e.Principal
        End If

    End Sub 'OnAuthenticate 


    Public ReadOnly Property ModuleName() As String
        Get
            Return "WebServiceAuthentication"
        End Get
    End Property


    Sub OnEnter(ByVal [source] As [Object],ByVal eventArgs As EventArgs)
        'Dim app As HttpApplication = CType([source],HttpApplication)
        'app = CType([source],HttpApplication)
        Dim context As HttpContext = app.Context
        Dim HttpStream As System.IO.Stream = context.Request.InputStream

        ' Save the current position of stream.
        Dim posStream As Long = HttpStream.Position

        ' If the request contains an HTTP_SOAPACTION 
        ' header,look at this message.

        'For Each str As String In context.Request.ServerVariables.AllKeys

        'If context.Request.ServerVariables(Str) IsNot Nothing Then
        'context.Response.Write("<h1>" + Str() + "= " + context.Request.ServerVariables(Str) + "</h1>")
        'End If
        'Next
        If context.Request.ServerVariables("HTTP_SOAPACTION") Is Nothing Then
            'context.Response.End()
            Return
            'Else
            'MsgBox(New System.IO.StreamReader(context.Request.InputStream).ReadToEnd())
        End If


        ' Load the body of the HTTP message
        ' into an XML document.
        Dim dom As New System.Xml.XmlDocument()
        Dim soapUser As String
        Dim soapPassword As String

        Try
            dom.Load(HttpStream)

            'dom.Save("C:UsersAdministratorDesktopSoapRequest.xml")
            ' Reset the stream position.
            HttpStream.Position = posStream

            ' Bind to the Authentication header.
            soapUser = dom.GetElementsByTagName("Username").Item(0).InnerText
            soapPassword = dom.GetElementsByTagName("Password").Item(0).InnerText
        Catch e As Exception
            ' Reset the position of stream.
            HttpStream.Position = posStream

            ' Throw a SOAP exception.
            Dim name As New System.Xml.XmlQualifiedName("Load")
            Dim ssoapException As New SoapException("Unable to read SOAP request",name,e)
            context.Response.StatusCode = System.Net.HttpStatusCode.Unauthorized
            context.Response.StatusDescription = "Access denied."

            ' context.Response.Write(ssoapException.ToString())
            'Dim x As New System.Xml.Serialization.XmlSerializer(GetType(SoapException))
            'context.Response.ContentType = "text/xml"
            'x.Serialize(context.Response.OutputStream,ssoapException)


            'Throw ssoapException

            context.Response.End()
        End Try

        ' Raise the custom global.asax event.
        OnAuthenticate(New WebServiceAuthenticationEvent(context,soapUser,soapPassword))
        Return
    End Sub 'OnEnter


End Class ' WebServiceAuthenticationModule