Web.config中的location設定

2009-11-18

11608
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前言

一般我們使用Asp.NET時，如果使用Form驗証方式的話，會設定Default的Page，當驗証失效時，要登出系統的話，該如何設定呢?

實作

在Web.config中有個location的Tag，是來指定特定資源做其他的設定，如登出會有一支程式叫logout.ashx，它就不需要一定要登入後才能執行到。或是有些程式，如公告的程式，就不需要在Form驗証之內。
設定Form的驗証
<authorization>
    <allow users="*"/>
</authorization>
<authentication mode="Forms">
    <forms name=".RAuth" loginUrl="Login.aspx" protection="All" timeout="20" path="/" requireSSL="false" slidingExpiration="true" defaultUrl="Login.aspx" cookieless="UseDeviceProfile" enableCrossAppRedirects="false"/>
</authentication>

設定排除在Form的驗証之外
<location path="Logout.ashx">
    <system.web>
        <authorization>
            <allow users="*"/>
            <allow users="?"/>
        </authorization>
    </system.web>
</location>

在設定location的Path時，它好像不認得~/這個，因為有次我設成~/Logout.ashx時，它就會一直跑去Login.aspx。不過，設排除是特別的需求啦，除非您像我一樣，User輸入帳號的Page跟我設定的Default 登入Page不同。
Logout.ashx做的事(主要是把Cookie給清掉)
<%@ WebHandler Language="VB" Class="Logout" %>

Imports System
Imports System.Web
Imports System.Web.Security
Imports System.Collections.Generic


Public Class Logout : Implements IHttpHandler
    Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
        Dim cookiesToClear As New List(Of String)
        For Each cookieName As String In context.Request.Cookies
            Dim cookie As HttpCookie = context.Request.Cookies(cookieName)
            cookiesToClear.Add(cookie.Name)
        Next
        
        For Each name As String In cookiesToClear
            Dim cookie As HttpCookie = New HttpCookie(name, String.Empty)
            cookie.Expires = DateTime.Today.AddYears(-1)
            context.Response.Cookies.Set(cookie)
        Next
        
        '到其他首頁
        Dim strTop As String = GetOtherURL();
        context.Response.Write("<script language='javascript'>top.window.location.href='" & strTop & "'</script>")
    End Sub
    
    Public ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable
        Get
            Return True
        End Get
    End Property
End Class