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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 input = valueProviderResult.FirstValue;
var elementType = bindingContext.ModelType.GetElementType();
if (input != null)
{
var converter = TypeDescriptor.GetConverter(elementType);
var values = Array.ConvertAll(
input.Split(new[] { "," }, StringSplitOptions.RemoveEmptyEntries),
x => { return converter.ConvertFromString(x != null ? x.Trim() : x); });
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;
}
}
}
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