37 lines
1.8 KiB
C#
37 lines
1.8 KiB
C#
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namespace System.Web.Mvc {
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using System.Collections.Specialized;
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internal class UrlRewriterHelper {
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private const string _urlWasRewrittenServerVar = "IIS_WasUrlRewritten";
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private const string _urlRewriterEnabledServerVar = "IIS_UrlRewriteModule";
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private object _lockObject = new object();
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private bool _urlRewriterIsTurnedOnValue;
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private bool _urlRewriterIsTurnedOnCalculated = false;
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private static bool WasThisRequestRewritten(HttpContextBase httpContext) {
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NameValueCollection serverVars = httpContext.Request.ServerVariables;
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bool requestWasRewritten = (serverVars != null && serverVars[_urlWasRewrittenServerVar] != null);
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return requestWasRewritten;
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}
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private bool IsUrlRewriterTurnedOn(HttpContextBase httpContext) {
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// Need to do double-check locking because a single instance of this class is shared in the entire app domain (see PathHelpers)
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if (!_urlRewriterIsTurnedOnCalculated) {
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lock (_lockObject) {
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if (!_urlRewriterIsTurnedOnCalculated) {
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NameValueCollection serverVars = httpContext.Request.ServerVariables;
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bool urlRewriterIsEnabled = (serverVars != null && serverVars[_urlRewriterEnabledServerVar] != null);
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_urlRewriterIsTurnedOnValue = urlRewriterIsEnabled;
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_urlRewriterIsTurnedOnCalculated = true;
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}
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}
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}
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return _urlRewriterIsTurnedOnValue;
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}
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public virtual bool WasRequestRewritten(HttpContextBase httpContext) {
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return IsUrlRewriterTurnedOn(httpContext) && WasThisRequestRewritten(httpContext);
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}
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}
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}
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