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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.Diagnostics.CodeAnalysis;
using System.Web.Routing;
namespace System.Web.Mvc
{
public static class RouteCollectionExtensions
{
// This method returns a new RouteCollection containing only routes that matched a particular area.
// The Boolean out parameter is just a flag specifying whether any registered routes were area-aware.
private static RouteCollection FilterRouteCollectionByArea(RouteCollection routes, string areaName, out bool usingAreas)
{
if (areaName == null)
{
areaName = String.Empty;
}
usingAreas = false;
RouteCollection filteredRoutes = new RouteCollection();
using (routes.GetReadLock())
{
foreach (RouteBase route in routes)
{
string thisAreaName = AreaHelpers.GetAreaName(route) ?? String.Empty;
usingAreas |= (thisAreaName.Length > 0);
if (String.Equals(thisAreaName, areaName, StringComparison.OrdinalIgnoreCase))
{
filteredRoutes.Add(route);
}
}
}
// if areas are not in use, the filtered route collection might be incorrect
return (usingAreas) ? filteredRoutes : routes;
}
public static VirtualPathData GetVirtualPathForArea(this RouteCollection routes, RequestContext requestContext, RouteValueDictionary values)
{
return GetVirtualPathForArea(routes, requestContext, null /* name */, values);
}
public static VirtualPathData GetVirtualPathForArea(this RouteCollection routes, RequestContext requestContext, string name, RouteValueDictionary values)
{
bool usingAreas; // don't care about this value
return GetVirtualPathForArea(routes, requestContext, name, values, out usingAreas);
}
internal static VirtualPathData GetVirtualPathForArea(this RouteCollection routes, RequestContext requestContext, string name, RouteValueDictionary values, out bool usingAreas)
{
if (routes == null)
{
throw new ArgumentNullException("routes");
}
if (!String.IsNullOrEmpty(name))
{
// the route name is a stronger qualifier than the area name, so just pipe it through
usingAreas = false;
return routes.GetVirtualPath(requestContext, name, values);
}
string targetArea = null;
if (values != null)
{
object targetAreaRawValue;
if (values.TryGetValue("area", out targetAreaRawValue))
{
targetArea = targetAreaRawValue as string;
}
else
{
// set target area to current area
if (requestContext != null)
{
targetArea = AreaHelpers.GetAreaName(requestContext.RouteData);
}
}
}
// need to apply a correction to the RVD if areas are in use
RouteValueDictionary correctedValues = values;
RouteCollection filteredRoutes = FilterRouteCollectionByArea(routes, targetArea, out usingAreas);
if (usingAreas)
{
correctedValues = new RouteValueDictionary(values);
correctedValues.Remove("area");
}
VirtualPathData vpd = filteredRoutes.GetVirtualPath(requestContext, correctedValues);
return vpd;
}
[SuppressMessage("Microsoft.Design", "CA1054:UriParametersShouldNotBeStrings", MessageId = "1#", Justification = "This is not a regular URL as it may contain special routing characters.")]
public static void IgnoreRoute(this RouteCollection routes, string url)
{
IgnoreRoute(routes, url, null /* constraints */);
}
[SuppressMessage("Microsoft.Design", "CA1054:UriParametersShouldNotBeStrings", MessageId = "1#", Justification = "This is not a regular URL as it may contain special routing characters.")]
public static void IgnoreRoute(this RouteCollection routes, string url, object constraints)
{
if (routes == null)
{
throw new ArgumentNullException("routes");
}
if (url == null)
{
throw new ArgumentNullException("url");
}
IgnoreRouteInternal route = new IgnoreRouteInternal(url)
{
Constraints = new RouteValueDictionary(constraints)
};
routes.Add(route);
}
[SuppressMessage("Microsoft.Design", "CA1054:UriParametersShouldNotBeStrings", MessageId = "2#", Justification = "This is not a regular URL as it may contain special routing characters.")]
public static Route MapRoute(this RouteCollection routes, string name, string url)
{
return MapRoute(routes, name, url, null /* defaults */, (object)null /* constraints */);
}
[SuppressMessage("Microsoft.Design", "CA1054:UriParametersShouldNotBeStrings", MessageId = "2#", Justification = "This is not a regular URL as it may contain special routing characters.")]
public static Route MapRoute(this RouteCollection routes, string name, string url, object defaults)
{
return MapRoute(routes, name, url, defaults, (object)null /* constraints */);
}
[SuppressMessage("Microsoft.Design", "CA1054:UriParametersShouldNotBeStrings", MessageId = "2#", Justification = "This is not a regular URL as it may contain special routing characters.")]
public static Route MapRoute(this RouteCollection routes, string name, string url, object defaults, object constraints)
{
return MapRoute(routes, name, url, defaults, constraints, null /* namespaces */);
}
[SuppressMessage("Microsoft.Design", "CA1054:UriParametersShouldNotBeStrings", MessageId = "2#", Justification = "This is not a regular URL as it may contain special routing characters.")]
public static Route MapRoute(this RouteCollection routes, string name, string url, string[] namespaces)
{
return MapRoute(routes, name, url, null /* defaults */, null /* constraints */, namespaces);
}
[SuppressMessage("Microsoft.Design", "CA1054:UriParametersShouldNotBeStrings", MessageId = "2#", Justification = "This is not a regular URL as it may contain special routing characters.")]
public static Route MapRoute(this RouteCollection routes, string name, string url, object defaults, string[] namespaces)
{
return MapRoute(routes, name, url, defaults, null /* constraints */, namespaces);
}
[SuppressMessage("Microsoft.Design", "CA1054:UriParametersShouldNotBeStrings", MessageId = "2#", Justification = "This is not a regular URL as it may contain special routing characters.")]
public static Route MapRoute(this RouteCollection routes, string name, string url, object defaults, object constraints, string[] namespaces)
{
if (routes == null)
{
throw new ArgumentNullException("routes");
}
if (url == null)
{
throw new ArgumentNullException("url");
}
Route route = new Route(url, new MvcRouteHandler())
{
Defaults = new RouteValueDictionary(defaults),
Constraints = new RouteValueDictionary(constraints),
DataTokens = new RouteValueDictionary()
};
if ((namespaces != null) && (namespaces.Length > 0))
{
route.DataTokens["Namespaces"] = namespaces;
}
routes.Add(name, route);
return route;
}
private sealed class IgnoreRouteInternal : Route
{
public IgnoreRouteInternal(string url)
: base(url, new StopRoutingHandler())
{
}
public override VirtualPathData GetVirtualPath(RequestContext requestContext, RouteValueDictionary routeValues)
{
// Never match during route generation. This avoids the scenario where an IgnoreRoute with
// fairly relaxed constraints ends up eagerly matching all generated URLs.
return null;
}
}
}
}
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