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90 lines
3.3 KiB
C#
90 lines
3.3 KiB
C#
using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Threading.Tasks;
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using Microsoft.AspNetCore.Mvc.ModelBinding;
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using Microsoft.Extensions.Logging;
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namespace Jellyfin.Api.ModelBinders
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{
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/// <summary>
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/// Comma delimited array model binder.
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/// Returns an empty array of specified type if there is no query parameter.
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/// </summary>
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public class CommaDelimitedArrayModelBinder : IModelBinder
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{
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private readonly ILogger<CommaDelimitedArrayModelBinder> _logger;
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/// <summary>
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/// Initializes a new instance of the <see cref="CommaDelimitedArrayModelBinder"/> class.
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/// </summary>
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/// <param name="logger">Instance of the <see cref="ILogger{CommaDelimitedArrayModelBinder}"/> interface.</param>
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public CommaDelimitedArrayModelBinder(ILogger<CommaDelimitedArrayModelBinder> logger)
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{
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_logger = logger;
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}
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/// <inheritdoc/>
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public Task BindModelAsync(ModelBindingContext bindingContext)
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{
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var valueProviderResult = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
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var elementType = bindingContext.ModelType.GetElementType() ?? bindingContext.ModelType.GenericTypeArguments[0];
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var converter = TypeDescriptor.GetConverter(elementType);
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if (valueProviderResult.Length > 1)
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{
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var typedValues = GetParsedResult(valueProviderResult.Values, elementType, converter);
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bindingContext.Result = ModelBindingResult.Success(typedValues);
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}
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else
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{
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var value = valueProviderResult.FirstValue;
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if (value != null)
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{
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var splitValues = value.Split(',', StringSplitOptions.RemoveEmptyEntries);
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var typedValues = GetParsedResult(splitValues, elementType, converter);
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bindingContext.Result = ModelBindingResult.Success(typedValues);
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}
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else
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{
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var emptyResult = Array.CreateInstance(elementType, 0);
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bindingContext.Result = ModelBindingResult.Success(emptyResult);
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}
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}
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return Task.CompletedTask;
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}
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private Array GetParsedResult(IReadOnlyList<string> values, Type elementType, TypeConverter converter)
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{
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var parsedValues = new object?[values.Count];
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var convertedCount = 0;
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for (var i = 0; i < values.Count; i++)
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{
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try
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{
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parsedValues[i] = converter.ConvertFromString(values[i].Trim());
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convertedCount++;
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}
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catch (FormatException e)
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{
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_logger.LogDebug(e, "Error converting value.");
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}
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}
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var typedValues = Array.CreateInstance(elementType, convertedCount);
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var typedValueIndex = 0;
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for (var i = 0; i < parsedValues.Length; i++)
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{
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if (parsedValues[i] != null)
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{
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typedValues.SetValue(parsedValues[i], typedValueIndex);
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typedValueIndex++;
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}
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}
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return typedValues;
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}
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}
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}
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