1 files changed, 23 insertions, 5 deletions
diff --git a/src/SMAPI.Web/Framework/VersionConstraint.cs b/src/SMAPI.Web/Framework/VersionConstraint.cs
index 2d6ec603..72f5ef84 100644
--- a/src/SMAPI.Web/Framework/VersionConstraint.cs
+++ b/src/SMAPI.Web/Framework/VersionConstraint.cs
@@ -1,16 +1,34 @@
-using Microsoft.AspNetCore.Routing.Constraints;
+using System;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Routing;
 using StardewModdingAPI.Toolkit;
 
 namespace StardewModdingAPI.Web.Framework
 {
     /// <summary>Constrains a route value to a valid semantic version.</summary>
-    internal class VersionConstraint : RegexRouteConstraint
+    internal class VersionConstraint : IRouteConstraint
     {
         /*********
         ** Public methods
         *********/
-        /// <summary>Construct an instance.</summary>
-        public VersionConstraint()
-            : base(SemanticVersion.Regex) { }
+        /// <summary>Get whether the URL parameter contains a valid value for this constraint.</summary>
+        /// <param name="httpContext">An object that encapsulates information about the HTTP request.</param>
+        /// <param name="route">The router that this constraint belongs to.</param>
+        /// <param name="routeKey">The name of the parameter that is being checked.</param>
+        /// <param name="values">A dictionary that contains the parameters for the URL.</param>
+        /// <param name="routeDirection">An object that indicates whether the constraint check is being performed when an incoming request is being handled or when a URL is being generated.</param>
+        /// <returns><c>true</c> if the URL parameter contains a valid value; otherwise, <c>false</c>.</returns>
+        public bool Match(HttpContext httpContext, IRouter route, string routeKey, RouteValueDictionary values, RouteDirection routeDirection)
+        {
+            if (routeKey == null)
+                throw new ArgumentNullException(nameof(routeKey));
+            if (values == null)
+                throw new ArgumentNullException(nameof(values));
+
+            return
+                values.TryGetValue(routeKey, out object routeValue)
+                && routeValue is string routeStr
+                && SemanticVersion.TryParseNonStandard(routeStr, out _);
+        }
     }
 }