private static RouteValidationResult EnsureCatchAllOnlyAppearAtEnd(Segment[] segments, RouteValueDictionary defaults, RouteValueDictionary constraints)
{
var catchAll = segments.OfType <CatchAllParameterSegment>().ToList();
return(catchAll.Count == 1 && segments.Last() != catchAll.Single()
? RouteValidationResult.Failure(string.Format("Catch-all parameters may only appear at the end of a route. Catch all parameter: '{0}'", catchAll.Single().ParameterName))
: RouteValidationResult.Successful());
}
private RouteValidationResult EnsureNoUnrecognizableSegments(Segment[] segments, RouteValueDictionary defaults, RouteValueDictionary constraints)
{
var unrecognized = segments.Where(x => SupportedSegmentTypes.Contains(x.GetType()) == false).ToList();
return(unrecognized.Count > 0
? RouteValidationResult.Failure(string.Format("Unrecognized segment types were found. If using a custom segment type, please replace the IRouteValidator to enforce your own route validation rules. Unrecognized types: {0}", string.Join(", ", unrecognized.Select(x => "'" + x.GetType().Name + "'").ToArray())))
: RouteValidationResult.Successful());
}
private static RouteValidationResult EnsureNoMoreThanOneCatchAllSegment(Segment[] segments, RouteValueDictionary defaults, RouteValueDictionary constraints)
{
var catchAll = segments.OfType <CatchAllParameterSegment>().ToList();
return(catchAll.Count > 1
? RouteValidationResult.Failure(string.Format("A route cannot have more than one catch-all parameter. Catch all parameters: {0}", string.Join(", ", catchAll.Select(x => "'" + x.ParameterName + "'").ToArray())))
: RouteValidationResult.Successful());
}
private static RouteValidationResult EnsureParameterNamesAreUnique(Segment[] segments, RouteValueDictionary defaults, RouteValueDictionary constraints)
{
var parameterSegments = segments.OfType <ParameterSegment>().Select(x => x.ParameterName);
var catchAllSegments = segments.OfType <CatchAllParameterSegment>().Select(x => x.ParameterName);
var parameterNames = parameterSegments.Concat(catchAllSegments).Select(x => x.ToLowerInvariant());
var duplicateNames = parameterNames.GroupBy(x => x).Where(g => g.Count() > 1).Select(x => x.Key).ToList();
return(duplicateNames.Count > 0
? RouteValidationResult.Failure(string.Format("The same parameter name cannot be used twice within a route. The following parameters appeared more than once: {0}", string.Join(", ", duplicateNames.Select(x => "'" + x + "'").ToArray())))
: RouteValidationResult.Successful());
}
/// <summary>
/// Validates the specified route, producing a <see cref="RouteValidationResult"/> indicating
/// what the error (if any) was.
/// </summary>
/// <param name="route">The route to validate.</param>
/// <returns>An object indicating the success of the validation attempt, and details about any error
/// encountered.</returns>
public virtual RouteValidationResult Validate(ParsedRoute route)
{
var segments = route.Segments;
// Shortcut - no need to check any rules for an empty route
if (segments.Length == 0)
{
return(RouteValidationResult.Successful());
}
return(Rules.Select(rule => rule(segments, route.Defaults, route.Constraints))
.FirstOrDefault(x => !x.Success)
?? RouteValidationResult.Successful());
}