Support querystring and anchor for local links in Delivery API output

src/Umbraco.Core/Models/DeliveryApi/ApiContentRoute.cs

@@ -10,5 +10,7 @@ public ApiContentRoute(string path, ApiContentStartItem startItem)
 
     public string Path { get; }
 
+    public string? QueryString { get; set; }
+
     public IApiContentStartItem StartItem { get; }
 }

src/Umbraco.Core/Models/DeliveryApi/IApiContentRoute.cs

@@ -4,5 +4,10 @@ public interface IApiContentRoute
 {
     string Path { get; }
 
+    public string? QueryString
+    {
+        get => null; set { }
+    }
+
     IApiContentStartItem StartItem { get; }
 }

src/Umbraco.Infrastructure/DeliveryApi/ApiRichTextMarkupParser.cs

@@ -56,7 +56,7 @@ private void ReplaceLocalLinks(HtmlDocument doc, IPublishedSnapshot publishedSna
                 link.GetAttributeValue("href", string.Empty),
                 route =>
                 {
-                    link.SetAttributeValue("href", route.Path);
+                    link.SetAttributeValue("href", $"{route.Path}{route.QueryString}");
                     link.SetAttributeValue("data-start-item-path", route.StartItem.Path);
                     link.SetAttributeValue("data-start-item-id", route.StartItem.Id.ToString("D"));
                 },

src/Umbraco.Infrastructure/DeliveryApi/ApiRichTextParserBase.cs

@@ -4,6 +4,7 @@
 using Umbraco.Cms.Core.Models.DeliveryApi;
 using Umbraco.Cms.Core.Models.PublishedContent;
 using Umbraco.Cms.Core.PublishedCache;
+using Umbraco.Extensions;
 
 namespace Umbraco.Cms.Infrastructure.DeliveryApi;
 
@@ -41,6 +42,7 @@ protected void ReplaceLocalLinks(IPublishedSnapshot publishedSnapshot, string hr
                     : null;
                 if (route != null)
                 {
+                    route.QueryString = match.Groups["query"].Value.NullOrWhiteSpaceAsNull();
                     handled = true;
                     handleContentRoute(route);
                 }
@@ -79,6 +81,6 @@ protected void ReplaceLocalImages(IPublishedSnapshot publishedSnapshot, string u
         handleMediaUrl(_apiMediaUrlProvider.GetUrl(media));
     }
 
-    [GeneratedRegex("{localLink:(?<udi>umb:.+)}")]
+    [GeneratedRegex("{localLink:(?<udi>umb:.+)}(?<query>[^\"]*)")]
     private static partial Regex LocalLinkRegex();
 }

tests/Umbraco.Tests.Integration/Umbraco.Core/DeliveryApi/OpenApiContractTest.cs

@@ -2269,6 +2269,10 @@ public async Task Validate_OpenApi_Contract()
                 "type": "string",
                 "readOnly": true
               },
+              "queryString": {
+                "type": "string",
+                "nullable": true
+              },
               "startItem": {
                 "$ref": "#/components/schemas/IApiContentStartItemModel"
               }

tests/Umbraco.Tests.UnitTests/Umbraco.Core/DeliveryApi/RichTextParserTests.cs

@@ -10,6 +10,7 @@
 using Umbraco.Cms.Core.PropertyEditors.ValueConverters;
 using Umbraco.Cms.Core.PublishedCache;
 using Umbraco.Cms.Infrastructure.DeliveryApi;
+using Umbraco.Extensions;
 
 namespace Umbraco.Cms.Tests.UnitTests.Umbraco.Core.DeliveryApi;
 
@@ -127,12 +128,16 @@ public void ParseElement_DataAttributesDoNotOverwriteExistingAttributes()
         Assert.AreEqual("the original something", span.Attributes.First().Value);
     }
 
-    [Test]
-    public void ParseElement_CanParseContentLink()
+
+    [TestCase(null)]
+    [TestCase("")]
+    [TestCase("#some-anchor")]
+    [TestCase("?something=true")]
+    public void ParseElement_CanParseContentLink(string? postfix)
     {
         var parser = CreateRichTextElementParser();
 
-        var element = parser.Parse($"<p><a href=\"/{{localLink:umb://document/{_contentKey:N}}}\"></a></p>") as RichTextRootElement;
+        var element = parser.Parse($"<p><a href=\"/{{localLink:umb://document/{_contentKey:N}}}{postfix}\"></a></p>") as RichTextRootElement;
         Assert.IsNotNull(element);
         var link = element.Elements.OfType<RichTextGenericElement>().Single().Elements.Single() as RichTextGenericElement;
         Assert.IsNotNull(link);
@@ -142,6 +147,7 @@ public void ParseElement_CanParseContentLink()
         var route = link.Attributes.First().Value as IApiContentRoute;
         Assert.IsNotNull(route);
         Assert.AreEqual("/some-content-path", route.Path);
+        Assert.AreEqual(postfix.NullOrWhiteSpaceAsNull(), route.QueryString);
         Assert.AreEqual(_contentRootKey, route.StartItem.Id);
         Assert.AreEqual("the-root-path", route.StartItem.Path);
     }
@@ -176,6 +182,22 @@ public void ParseElement_CanHandleNonLocalLink()
         Assert.AreEqual("https://some.where/else/", link.Attributes.First().Value);
     }
 
+    [TestCase("#some-anchor")]
+    [TestCase("?something=true")]
+    public void ParseElement_CanHandleNonLocalLink_WithPostfix(string postfix)
+    {
+        var parser = CreateRichTextElementParser();
+
+        var element = parser.Parse($"<p><a href=\"https://some.where/else/{postfix}\"></a></p>") as RichTextRootElement;
+        Assert.IsNotNull(element);
+        var link = element.Elements.OfType<RichTextGenericElement>().Single().Elements.Single() as RichTextGenericElement;
+        Assert.IsNotNull(link);
+        Assert.AreEqual("a", link.Tag);
+        Assert.AreEqual(1, link.Attributes.Count);
+        Assert.AreEqual("href", link.Attributes.First().Key);
+        Assert.AreEqual($"https://some.where/else/{postfix}", link.Attributes.First().Value);
+    }
+
     [Test]
     public void ParseElement_LinkTextIsWrappedInTextElement()
     {
@@ -465,6 +487,18 @@ public void ParseMarkup_CanParseContentLink()
         Assert.IsTrue(result.Contains($"data-start-item-id=\"{_contentRootKey:D}\""));
     }
 
+    [TestCase("#some-anchor")]
+    [TestCase("?something=true")]
+    public void ParseMarkup_CanParseContentLink_WithPostfix(string postfix)
+    {
+        var parser = CreateRichTextMarkupParser();
+
+        var result = parser.Parse($"<p><a href=\"/{{localLink:umb://document/{_contentKey:N}}}{postfix}\"></a></p>");
+        Assert.IsTrue(result.Contains($"href=\"/some-content-path{postfix}\""));
+        Assert.IsTrue(result.Contains("data-start-item-path=\"the-root-path\""));
+        Assert.IsTrue(result.Contains($"data-start-item-id=\"{_contentRootKey:D}\""));
+    }
+
     [Test]
     public void ParseMarkup_CanParseMediaLink()
     {
@@ -485,6 +519,8 @@ public void ParseMarkup_InvalidLocalLinkYieldsEmptyLink(string href)
     }
 
     [TestCase("<p><a href=\"https://some.where/else/\"></a></p>")]
+    [TestCase("<p><a href=\"https://some.where/else/#some-anchor\"></a></p>")]
+    [TestCase("<p><a href=\"https://some.where/else/?something=true\"></a></p>")]
     [TestCase("<p><img src=\"https://some.where/something.png?rmode=max&amp;width=500\"></p>")]
     public void ParseMarkup_CanHandleNonLocalReferences(string html)
     {