Created
August 17, 2017 10:40
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Validate model state and unflatten for use with redux-form.
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| using System; | |
| using System.Collections.Generic; | |
| using System.Dynamic; | |
| using System.Linq; | |
| using System.Text.RegularExpressions; | |
| using System.Web.Http.Controllers; | |
| using System.Web.Http.Filters; | |
| using System.Web.Http.ModelBinding; | |
| using CDNAdmin.Web.Exceptions; | |
| namespace CDNAdmin.Web.Filters | |
| { | |
| public class ValidateApiModelStateFilter : ActionFilterAttribute | |
| { | |
| private static readonly Regex ListElemRegex = new Regex(@"([a-zA-z]*)\[([^\[\]]*)\]"); | |
| private static T GetKeyFromDict<T>(string key, IDictionary<string, object> dict) where T : class, new() | |
| { | |
| if (!dict.ContainsKey(key)) | |
| { | |
| dict[key] = new T(); | |
| } | |
| return dict[key] as T; | |
| } | |
| private static void InsertListElem(Match listKeyMatch, IDictionary<string, object> dict, object objToInsert) | |
| { | |
| var key = listKeyMatch.Groups[1].Value; | |
| var index = int.Parse(listKeyMatch.Groups[2].Value); | |
| var list = GetKeyFromDict<List<dynamic>>(key, dict); | |
| if (list.Count < index) | |
| { | |
| for (var i = list.Count; i < index; i++) | |
| { | |
| list.Add(null); | |
| } | |
| } | |
| list.Insert(index, objToInsert); | |
| } | |
| private static void SetDictionaryElem(IList<string> keyList, IDictionary<string, object> dict, IList<string> errList) | |
| { | |
| var firstKey = keyList[0]; | |
| var listKeyMatch = ListElemRegex.Match(firstKey); | |
| if (keyList.Count == 1) | |
| { | |
| if (string.IsNullOrWhiteSpace(firstKey)) return; | |
| if (listKeyMatch.Success) | |
| { | |
| InsertListElem(listKeyMatch, dict, errList); | |
| } | |
| else | |
| { | |
| dict[firstKey] = errList; | |
| } | |
| } | |
| else | |
| { | |
| if (listKeyMatch.Success) | |
| { | |
| var newDictElem = new Dictionary<string, object>(); | |
| InsertListElem(listKeyMatch, dict, newDictElem); | |
| SetDictionaryElem(keyList.Skip(1).ToList(), newDictElem, errList); | |
| } | |
| else | |
| { | |
| var elem = GetKeyFromDict<Dictionary<string, object>>(firstKey, dict); | |
| SetDictionaryElem(keyList.Skip(1).ToList(), elem, errList); | |
| } | |
| } | |
| } | |
| public static IDictionary<string, object> UnflattenModelState(ModelStateDictionary modelState) | |
| { | |
| var unflattenedModelState = new ExpandoObject() as IDictionary<string, object>; | |
| foreach (var pair in modelState) | |
| { | |
| if (pair.Value.Errors.Count > 0) | |
| { | |
| var keySplit = pair.Key.Split('.').ToList(); | |
| var errors = pair.Value.Errors.Select(error => error.ErrorMessage).ToList(); | |
| SetDictionaryElem(keySplit, unflattenedModelState, errors); | |
| } | |
| } | |
| return unflattenedModelState; | |
| } | |
| public override void OnActionExecuting(HttpActionContext actionContext) | |
| { | |
| var modelState = actionContext.ModelState; | |
| if (!modelState.IsValid) | |
| { | |
| throw new ModelStateValidationException(UnflattenModelState(modelState)); | |
| } | |
| } | |
| } | |
| } |
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