Created
November 15, 2018 21:55
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Path Model Binder for ASP.NET Core
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| using System; | |
| using System.Text.RegularExpressions; | |
| using System.Threading.Tasks; | |
| using Microsoft.AspNetCore.Mvc; | |
| using Microsoft.AspNetCore.Mvc.ModelBinding; | |
| namespace MyNameSpace | |
| { | |
| public class PathModelBinderAttribute : ModelBinderAttribute | |
| { | |
| public PathModelBinderAttribute() | |
| : base(typeof(PathModelBinder)) | |
| { | |
| } | |
| } | |
| public class PathModelBinder : IModelBinder | |
| { | |
| // Kestrel does not automatically decode %2F to / in parameters, so we need to do it ourselves | |
| // https://github.com/aspnet/KestrelHttpServer/issues/1425 | |
| // https://github.com/aspnet/KestrelHttpServer/issues/2946 | |
| private static readonly Regex EncodedPathCharRegex = new Regex("%2F", RegexOptions.IgnoreCase | RegexOptions.Compiled); | |
| public Task BindModelAsync(ModelBindingContext bindingContext) | |
| { | |
| if (bindingContext == null) | |
| { | |
| throw new ArgumentNullException(nameof(bindingContext)); | |
| } | |
| if (bindingContext.ModelType != typeof(string)) | |
| { | |
| return Task.CompletedTask; | |
| } | |
| var modelName = GetModelName(bindingContext); | |
| var valueProviderResult = bindingContext.ValueProvider.GetValue(modelName); | |
| if (valueProviderResult == ValueProviderResult.None) | |
| { | |
| return Task.CompletedTask; | |
| } | |
| bindingContext.ModelState.SetModelValue(modelName, valueProviderResult); | |
| var inputString = valueProviderResult.FirstValue; | |
| if (inputString == null || inputString.IndexOf("%2F", StringComparison.OrdinalIgnoreCase) == -1) | |
| { | |
| bindingContext.Result = ModelBindingResult.Success(inputString); | |
| } | |
| else | |
| { | |
| var outputString = EncodedPathCharRegex.Replace(inputString, "/"); | |
| bindingContext.Result = ModelBindingResult.Success(outputString); | |
| } | |
| return Task.CompletedTask; | |
| } | |
| private string GetModelName(ModelBindingContext bindingContext) | |
| { | |
| return string.IsNullOrEmpty(bindingContext.BinderModelName) | |
| ? bindingContext.ModelName | |
| : bindingContext.BinderModelName; | |
| } | |
| } | |
| } |
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