1 files changed, 64 insertions, 0 deletions
diff --git a/Jellyfin.Api/ModelBinders/CommaDelimitedArrayModelBinder.cs b/Jellyfin.Api/ModelBinders/CommaDelimitedArrayModelBinder.cs
new file mode 100644
index 000000000..13469194a
--- /dev/null
+++ b/Jellyfin.Api/ModelBinders/CommaDelimitedArrayModelBinder.cs
@@ -0,0 +1,64 @@
+using System;
+using System.ComponentModel;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc.ModelBinding;
+
+namespace Jellyfin.Api.ModelBinders
+{
+    /// <summary>
+    /// Comma delimited array model binder.
+    /// Returns an empty array of specified type if there is no query parameter.
+    /// </summary>
+    public class CommaDelimitedArrayModelBinder : IModelBinder
+    {
+        /// <inheritdoc/>
+        public Task BindModelAsync(ModelBindingContext bindingContext)
+        {
+            var valueProviderResult = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
+            var elementType = bindingContext.ModelType.GetElementType();
+            var converter = TypeDescriptor.GetConverter(elementType);
+
+            if (valueProviderResult == ValueProviderResult.None)
+            {
+                return Task.CompletedTask;
+            }
+
+            if (valueProviderResult.Length > 1)
+            {
+                var result = Array.CreateInstance(elementType, valueProviderResult.Length);
+
+                for (int i = 0; i < valueProviderResult.Length; i++)
+                {
+                    var value = converter.ConvertFromString(valueProviderResult.Values[i].Trim());
+
+                    result.SetValue(value, i);
+                }
+
+                bindingContext.Result = ModelBindingResult.Success(result);
+            }
+            else
+            {
+                var value = valueProviderResult.FirstValue;
+
+                if (value != null)
+                {
+                    var values = Array.ConvertAll(
+                        value.Split(new[] { "," }, StringSplitOptions.RemoveEmptyEntries),
+                        x => converter.ConvertFromString(x?.Trim()));
+
+                    var typedValues = Array.CreateInstance(elementType, values.Length);
+                    values.CopyTo(typedValues, 0);
+
+                    bindingContext.Result = ModelBindingResult.Success(typedValues);
+                }
+                else
+                {
+                    var emptyResult = Array.CreateInstance(elementType, 0);
+                    bindingContext.Result = ModelBindingResult.Success(emptyResult);
+                }
+            }
+
+            return Task.CompletedTask;
+        }
+    }
+}