Fix #7516

Emby.Dlna/Server/DescriptionXmlBuilder.cs

@@ -147,11 +147,16 @@ namespace Emby.Dlna.Server
             }
         }
 
-        private string GetFriendlyName()
+        internal string GetFriendlyName()
         {
             if (string.IsNullOrEmpty(_profile.FriendlyName))
             {
-                return "Jellyfin - " + _serverName;
+                return _serverName;
+            }
+
+            if (!_profile.FriendlyName.Contains("${HostName}", StringComparison.OrdinalIgnoreCase))
+            {
+                return _profile.FriendlyName;
             }
 
             var characterList = new List<char>();
@@ -164,13 +169,18 @@ namespace Emby.Dlna.Server
                 }
             }
 
-            var characters = characterList.ToArray();
-
-            var serverName = new string(characters);
-
-            var name = _profile.FriendlyName?.Replace("${HostName}", serverName, StringComparison.OrdinalIgnoreCase);
+            var serverName = string.Create(
+                characterList.Count,
+                characterList,
+                (dest, source) =>
+                {
+                    for (int i = 0; i < dest.Length; i++)
+                    {
+                        dest[i] = source[i];
+                    }
+                });
 
-            return name ?? string.Empty;
+            return _profile.FriendlyName.Replace("${HostName}", serverName, StringComparison.OrdinalIgnoreCase);
         }
 
         private void AppendIconList(StringBuilder builder)

tests/Jellyfin.Dlna.Tests/Server/DescriptionXmlBuilderTests.cs

@@ -0,0 +1,47 @@
+using Emby.Dlna.Server;
+using MediaBrowser.Model.Dlna;
+using Xunit;
+
+namespace Jellyfin.Dlna.Server.Tests;
+
+public class DescriptionXmlBuilderTests
+{
+    [Fact]
+    public void GetFriendlyName_EmptyProfile_ReturnsServerName()
+    {
+        const string ServerName = "Test Server Name";
+        var builder = new DescriptionXmlBuilder(new DeviceProfile(), "serverUdn", "localhost", ServerName, string.Empty);
+        Assert.Equal(ServerName, builder.GetFriendlyName());
+    }
+
+    [Fact]
+    public void GetFriendlyName_FriendlyName_ReturnsFriendlyName()
+    {
+        const string FriendlyName = "Friendly Neighborhood Test Server";
+        var builder = new DescriptionXmlBuilder(
+            new DeviceProfile()
+            {
+                FriendlyName = FriendlyName
+            },
+            "serverUdn",
+            "localhost",
+            "Test Server Name",
+            string.Empty);
+        Assert.Equal(FriendlyName, builder.GetFriendlyName());
+    }
+
+    [Fact]
+    public void GetFriendlyName_FriendlyNameInterpolation_ReturnsFriendlyName()
+    {
+        var builder = new DescriptionXmlBuilder(
+            new DeviceProfile()
+            {
+                FriendlyName = "Friendly Neighborhood ${HostName}"
+            },
+            "serverUdn",
+            "localhost",
+            "Test Server Name",
+            string.Empty);
+        Assert.Equal("Friendly Neighborhood TestServerName", builder.GetFriendlyName());
+    }
+}