public string BuySubscription(int accountId, string subscriptionType)
{
string subscriptionTypes = System.IO.File.ReadAllText("SubscriptionTypes.json");
int subscriptionCost;
int subscriptionDuration;
string subscriptionDescription;
using (JsonDocument doc = JsonDocument.Parse(subscriptionTypes))
{
JsonElement root = doc.RootElement;
JsonElement jsSubsType = root.GetProperty(subscriptionType);
subscriptionCost = jsSubsType.GetProperty("cost").GetInt32();
subscriptionDuration = jsSubsType.GetProperty("duration").GetInt32();
subscriptionDescription = jsSubsType.GetProperty("description").GetString();
}
if (subscriptionCost == 0 || subscriptionDuration == 0)
{
throw new AppException("Ошибка в указании типа подписки");
}
// 1. Сохраняем информацию о покупке в БД и формируем ссылку для оплаты
Subscription newSubscription = new Subscription
{
UserId = accountId,
Type = subscriptionType,
Duration = subscriptionDuration,
Cost = subscriptionCost,
OrderDate = DateTime.Now
};
_context.Subscriptions.Add(newSubscription);
_context.SaveChanges();
int invoiceId = _context.Subscriptions.SingleOrDefault(x =>
x.UserId == newSubscription.UserId &&
x.OrderDate == newSubscription.OrderDate)
.Id;
RobokassaItemModel[] robokassaItems = new RobokassaItemModel[] {
new RobokassaItemModel {
name = subscriptionDescription,
quantity = 1,
sum = subscriptionCost,
tax = "none"
}
};
RobokassaReceiptModel robokassaReceipt = new RobokassaReceiptModel {
items = robokassaItems
};
var robokassaInfo = GenerateRobokassaLink(subscriptionCost, subscriptionDescription, invoiceId, robokassaReceipt);
newSubscription.OrderId = robokassaInfo.signatureValue;
_context.Subscriptions.Update(newSubscription);
_context.SaveChanges();
// 2. Перенаправляем пользователя на страницу оплаты
string url = robokassaInfo.link;
return(url);
}
private (string link, string signatureValue) GenerateRobokassaLink(decimal amount, string description, int invoiceId, RobokassaReceiptModel receipt)
{
bool isTest = true;
string roboShopName = _appSettings.RobokassaShopName;
string roboFirstPassw = _appSettings.RobokassaFirstPassw;
JsonSerializerOptions jsonOptions = new JsonSerializerOptions
{
Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping,
IgnoreNullValues = true
};
string jsStringReceipt = JsonSerializer.Serialize <RobokassaReceiptModel>(receipt, jsonOptions);
// кодировать Receipt нужно 1 раз для расчета сигнатуры и 2 раза для добавления в ссылку,
// т.к. браузер автоматически декодирует его (так сказали в техподдержке робокассы)
string signatureReceipt = WebUtility.UrlEncode(jsStringReceipt);
string urlReceipt = WebUtility.UrlEncode(signatureReceipt);
string
amountStr = amount.ToString("0.00", System.Globalization.CultureInfo.InvariantCulture),
invoiceIdStr = invoiceId.ToString(),
srcBase = $"{roboShopName}:{amountStr}:{invoiceIdStr}:{signatureReceipt}:{roboFirstPassw}";
//srcBase = $"{roboShopName}:{amountStr}:{invoiceIdStr}:{roboFirstPassw}";
string signatureValue = generateSHA256Hash(srcBase);
string authPaymentString;
if (isTest)
{
authPaymentString = "https://auth.robokassa.ru/Merchant/Index.aspx" + "?isTest=1" +
"&MrchLogin="******"&OutSum=" + amountStr +
"&InvId=" + invoiceIdStr +
"&Receipt=" + urlReceipt +
"&Description=" + description +
"&SignatureValue=" + signatureValue +
"&Culture=ru";
}
else
{
authPaymentString = "https://auth.robokassa.ru/Merchant/Index.aspx" +
"?MrchLogin="******"&OutSum=" + amountStr +
"&InvId=" + invoiceIdStr +
"&Receipt=" + urlReceipt +
"&Description=" + description +
"&SignatureValue=" + signatureValue +
"&Culture=ru";
}
return(authPaymentString, signatureValue);
}
