fix incorrect link URLs in some cases

1 files changed, 28 insertions, 0 deletions

diff --git a/src/SMAPI.Web/Framework/Extensions.cs b/src/SMAPI.Web/Framework/Extensions.cs
new file mode 100644
index 00000000..d7707924
--- /dev/null
+++ b/src/SMAPI.Web/Framework/Extensions.cs
@@ -0,0 +1,28 @@
+using JetBrains.Annotations;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Routing;
+
+namespace StardewModdingAPI.Web.Framework
+{
+    /// <summary>Provides extensions on ASP.NET Core types.</summary>
+    public static class Extensions
+    {
+        /// <summary>Get a URL with the absolute path for an action method. Unlike <see cref="IUrlHelper.Action"/>, only the specified <paramref name="values"/> are added to the URL without merging values from the current HTTP request.</summary>
+        /// <param name="helper">The URL helper to extend.</param>
+        /// <param name="action">The name of the action method.</param>
+        /// <param name="controller">The name of the controller.</param>
+        /// <param name="values">An object that contains route values.</param>
+        /// <returns>The generated URL.</returns>
+        public static string PlainAction(this IUrlHelper helper, [AspMvcAction] string action, [AspMvcController] string controller, object values = null)
+        {
+            RouteValueDictionary valuesDict = new RouteValueDictionary(values);
+            foreach (var value in helper.ActionContext.RouteData.Values)
+            {
+                if (!valuesDict.ContainsKey(value.Key))
+                    valuesDict[value.Key] = null; // explicitly remove it from the URL
+            }
+
+            return helper.Action(action, controller, valuesDict);
+        }
+    }
+}