| | | 1 | | using Microsoft.AspNetCore.Mvc; |
| | | 2 | | using Microsoft.AspNetCore.Mvc.Filters; |
| | | 3 | | using OzonOrdersWeb.TransactionServices; |
| | | 4 | | |
| | | 5 | | namespace OzonOrdersWeb.Filters; |
| | | 6 | | |
| | | 7 | | /// <summary> |
| | | 8 | | /// Защита от повторных заказов для эндпоинтов, которые отправляют реальный заказ поставщику из его корзины. |
| | | 9 | | /// Ставится на действие вида «Создать заказ»: фильтр определяет заказы Studio2 по выбранным строкам корзины и, |
| | | 10 | | /// если какой-то из них уже заказан у поставщика, отвечает <c>409</c> со структурированным списком конфликтов |
| | | 11 | | /// (<c>conflicts</c>) вместо вызова действия. Повторить можно только запросом с полем формы |
| | | 12 | | /// <see cref="ConfirmedFieldName"/> — отпечатками конфликтов, которые пользователь увидел и разрешил. |
| | | 13 | | /// </summary> |
| | | 14 | | [AttributeUsage(AttributeTargets.Method)] |
| | | 15 | | public sealed class SupplierOrderGuardAttribute : TypeFilterAttribute |
| | | 16 | | { |
| | | 17 | | public SupplierOrderGuardAttribute(string? providerKey = null, bool nullMeansAll = true) |
| | 144 | 18 | | : base(typeof(SupplierOrderGuardFilter)) |
| | | 19 | | { |
| | 144 | 20 | | Arguments = [providerKey ?? string.Empty, nullMeansAll]; |
| | 144 | 21 | | } |
| | | 22 | | } |
| | | 23 | | |
| | | 24 | | public sealed class SupplierOrderGuardFilter : IAsyncActionFilter |
| | | 25 | | { |
| | | 26 | | public const string ConfirmedFieldName = "confirmedConflictIds"; |
| | | 27 | | |
| | | 28 | | private static readonly string[] IdArguments = ["cartItemIds", "basketItemIds", "basketIds"]; |
| | | 29 | | private static readonly string[] AllFlagArguments = ["createAll", "checkoutAll"]; |
| | | 30 | | |
| | | 31 | | private readonly ISupplierOrderGuard _guard; |
| | | 32 | | private readonly string? _providerKey; |
| | | 33 | | private readonly bool _nullMeansAll; |
| | | 34 | | |
| | | 35 | | public SupplierOrderGuardFilter(ISupplierOrderGuard guard, string? providerKey, bool nullMeansAll) |
| | | 36 | | { |
| | | 37 | | _guard = guard; |
| | | 38 | | _providerKey = string.IsNullOrWhiteSpace(providerKey) ? null : providerKey; |
| | | 39 | | _nullMeansAll = nullMeansAll; |
| | | 40 | | } |
| | | 41 | | |
| | | 42 | | public async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next) |
| | | 43 | | { |
| | | 44 | | var provider = _providerKey ?? (context.ActionArguments.TryGetValue("provider", out var value) ? value as string |
| | | 45 | | if (string.IsNullOrWhiteSpace(provider)) |
| | | 46 | | { |
| | | 47 | | // Провайдер неизвестен — действие само вернёт ошибку валидации. |
| | | 48 | | await next(); |
| | | 49 | | return; |
| | | 50 | | } |
| | | 51 | | |
| | | 52 | | var ct = context.HttpContext.RequestAborted; |
| | | 53 | | var user = context.HttpContext.User.Identity?.Name; |
| | | 54 | | var targets = await _guard.ResolveCartTargetsAsync(provider, ResolveCartItemIds(context), ct); |
| | | 55 | | if (targets.Count == 0) |
| | | 56 | | { |
| | | 57 | | await next(); |
| | | 58 | | return; |
| | | 59 | | } |
| | | 60 | | |
| | | 61 | | var confirmation = SupplierOrderConfirmation.FromIds(ReadConfirmedIds(context.HttpContext.Request)); |
| | | 62 | | var result = await _guard.EvaluateAsync(targets, confirmation, user, ct); |
| | | 63 | | if (!result.IsAllowed) |
| | | 64 | | { |
| | | 65 | | context.Result = new ObjectResult(new |
| | | 66 | | { |
| | | 67 | | success = false, |
| | | 68 | | requiresConfirmation = true, |
| | | 69 | | error = result.BlockingMessage(), |
| | | 70 | | conflicts = result.Blocking |
| | | 71 | | }) |
| | | 72 | | { StatusCode = StatusCodes.Status409Conflict }; |
| | | 73 | | return; |
| | | 74 | | } |
| | | 75 | | |
| | | 76 | | // Намерение фиксируется ДО обращения к поставщику; если другой запрос успел раньше — заказ не отправляется. |
| | | 77 | | var start = await _guard.BeginDispatchAsync(Guid.NewGuid().ToString("N"), "SupplierCart", targets, result, user, |
| | | 78 | | if (!start.CanProceed) |
| | | 79 | | { |
| | | 80 | | context.Result = new ObjectResult(new |
| | | 81 | | { |
| | | 82 | | success = false, |
| | | 83 | | requiresConfirmation = false, |
| | | 84 | | error = start.Message, |
| | | 85 | | conflicts = start.Conflicts |
| | | 86 | | }) |
| | | 87 | | { StatusCode = StatusCodes.Status409Conflict }; |
| | | 88 | | return; |
| | | 89 | | } |
| | | 90 | | |
| | | 91 | | var executed = await next(); |
| | | 92 | | |
| | | 93 | | // Исключение (в том числе обрыв запроса) — исход неизвестен: намерение остаётся Placing и блокирует повтор до с |
| | | 94 | | if (executed.Exception is null || executed.ExceptionHandled) |
| | | 95 | | await _guard.CompleteDispatchAsync(start.Dispatch!); |
| | | 96 | | } |
| | | 97 | | |
| | | 98 | | /// <returns><c>null</c> — вся активная корзина; иначе выбранные строки (может быть пустым).</returns> |
| | | 99 | | private IReadOnlyCollection<string>? ResolveCartItemIds(ActionExecutingContext context) |
| | | 100 | | { |
| | | 101 | | foreach (var name in AllFlagArguments) |
| | | 102 | | { |
| | | 103 | | if (context.ActionArguments.TryGetValue(name, out var flag) && flag is true) return null; |
| | | 104 | | } |
| | | 105 | | |
| | | 106 | | foreach (var name in IdArguments) |
| | | 107 | | { |
| | | 108 | | if (!context.ActionArguments.TryGetValue(name, out var ids)) continue; |
| | | 109 | | return ids switch |
| | | 110 | | { |
| | | 111 | | long[] numbers => numbers.Select(x => x.ToString(System.Globalization.CultureInfo.InvariantCulture)).ToA |
| | | 112 | | string[] texts => texts, |
| | | 113 | | null => _nullMeansAll ? null : [], |
| | | 114 | | _ => [] |
| | | 115 | | }; |
| | | 116 | | } |
| | | 117 | | |
| | | 118 | | return _nullMeansAll ? null : []; |
| | | 119 | | } |
| | | 120 | | |
| | | 121 | | private static IEnumerable<string> ReadConfirmedIds(HttpRequest request) |
| | | 122 | | { |
| | | 123 | | if (!request.HasFormContentType) return []; |
| | | 124 | | return request.Form[ConfirmedFieldName].SelectMany(x => (x ?? string.Empty).Split(',', StringSplitOptions.Remove |
| | | 125 | | } |
| | | 126 | | } |