private async Task <string> CheckLimitAsync(
double cashPeriodValue,
double transferPeriodValue,
CashOperationLimitation limit,
LimitationPeriod period,
string clientId,
string asset,
double amount)
{
double currentValue = cashPeriodValue;
if (limit.LimitationType == LimitationType.CardAndSwiftCashIn)
{
currentValue += transferPeriodValue;
}
double limitValue = (await _currencyConverter.ConvertAsync(limit.Asset, _currencyConverter.DefaultAsset, limit.Limit)).Item2;
if (limitValue < currentValue + amount)
{
return(GetPeriodLimitFailMessage(period));
}
double antiFraudValue = await _antiFraudCollector.GetAttemptsValueAsync(
clientId,
asset,
limit.LimitationType);
if (limitValue < currentValue + amount + antiFraudValue)
{
var forbidDuration = limit.LimitationType == LimitationType.CardCashIn ? CashOperationsTimeoutInMinutes : _attemptRetainInMinutes;
return($"Please wait {forbidDuration} minute(s) after previous payment attempt");
}
return(null);
}
public async Task <(double, bool)> GetCurrentAmountAsync(
string clientId,
string asset,
LimitationPeriod period,
CurrencyOperationType operationType)
{
(var items, bool notCached) = await _data.GetClientDataAsync(clientId, operationType);
double result = 0;
DateTime now = DateTime.UtcNow;
foreach (var item in items)
{
if (item.Asset != asset)
{
continue;
}
if (period == LimitationPeriod.Day &&
now.Subtract(item.DateTime).TotalHours >= 24)
{
continue;
}
result += item.Volume;
}
return(result, notCached);
}
private string GetPeriodLimitFailMessage(LimitationPeriod period)
{
switch (period)
{
case LimitationPeriod.Day:
return("Operation is not allowed because of Daily limitation.");
case LimitationPeriod.Month:
return("Operation is not allowed because of Monthly limitation.");
default:
throw new NotSupportedException($"Limitation period {period} is not supported");
}
}
private async Task AddRemainingLimitsAsync(string clientId, LimitationPeriod period, ClientData clientData)
{
var result = new List <RemainingLimitation>();
var periodLimits = _limits.Where(l => l.Period == period);
foreach (var periodLimit in periodLimits)
{
if (!string.IsNullOrWhiteSpace(periodLimit.ClientId) && clientId != periodLimit.ClientId)
{
continue;
}
if (periodLimit.LimitationType == LimitationType.CardCashIn)
{
result.Add(
await CalculateRemainingAsync(
clientData.CashOperations,
clientData.OperationAttempts,
new List <CurrencyOperationType> {
CurrencyOperationType.CardCashIn
},
periodLimit));
}
else if (periodLimit.LimitationType == LimitationType.CryptoCashOut)
{
result.Add(
await CalculateRemainingAsync(
clientData.CashOperations,
clientData.OperationAttempts,
new List <CurrencyOperationType> {
CurrencyOperationType.CryptoCashOut
},
periodLimit));
}
else if (periodLimit.LimitationType == LimitationType.CardAndSwiftCashIn)
{
result.Add(
await CalculateRemainingAsync(
clientData.CashOperations.Concat(clientData.CashTransferOperations),
clientData.OperationAttempts,
new List <CurrencyOperationType> {
CurrencyOperationType.CardCashIn, CurrencyOperationType.SwiftTransfer
},
periodLimit));
}
}
clientData.RemainingLimits = result;
}
public async Task <ClientData> GetClientDataAsync(string clientId, LimitationPeriod period)
{
var result = new ClientData
{
CashOperations = await _cashOperationsCollector.GetClientDataAsync(clientId, period),
CashTransferOperations = (await _cashTransfersCollector.GetClientDataAsync(clientId, period))
.Select(i => new CashOperation
{
Id = i.Id,
ClientId = i.ClientId,
Asset = i.Asset,
Volume = i.Volume,
DateTime = i.DateTime,
OperationType = i.OperationType,
})
.ToList(),
OperationAttempts = await _antiFraudCollector.GetClientDataAsync(clientId),
};
await AddRemainingLimitsAsync(clientId, period, result);
return(result);
}
public async Task <(double, bool)> GetCurrentAmountAsync(
string clientId,
string asset,
LimitationPeriod period,
CurrencyOperationType operationType,
bool checkAllCrypto = false)
{
int sign;
switch (operationType)
{
case CurrencyOperationType.CardCashIn:
case CurrencyOperationType.CryptoCashIn:
case CurrencyOperationType.SwiftTransfer:
sign = 1;
break;
case CurrencyOperationType.CardCashOut:
case CurrencyOperationType.CryptoCashOut:
case CurrencyOperationType.SwiftTransferOut:
sign = -1;
break;
default:
throw new NotSupportedException($"Operation type {operationType} can't be mapped to CashFlowDirection!");
}
(var items, bool notCached) = await _data.GetClientDataAsync(clientId, operationType);
DateTime now = DateTime.UtcNow;
double result = 0;
foreach (var item in items)
{
if (period == LimitationPeriod.Day &&
now.Subtract(item.DateTime).TotalHours >= 24)
{
continue;
}
if (Math.Sign(item.Volume) != Math.Sign(sign))
{
continue;
}
double amount;
if (checkAllCrypto)
{
if (!_currencyConverter.IsNotConvertible(item.Asset))
{
continue;
}
var(_, convertedAmount) = await _currencyConverter.ConvertAsync(
item.Asset,
_currencyConverter.DefaultAsset,
item.Volume,
true);
amount = convertedAmount;
}
else
{
if (item.Asset != asset)
{
continue;
}
amount = item.Volume;
}
result += amount;
}
return(Math.Abs(result), notCached);
}
public async Task <List <CashOperation> > GetClientDataAsync(string clientId, LimitationPeriod period)
{
var(result, _) = await _data.GetClientDataAsync(clientId);
if (period == LimitationPeriod.Day)
{
var now = DateTime.UtcNow;
result.RemoveAll(i => now.Subtract(i.DateTime).TotalHours >= 24);
}
foreach (var item in result)
{
if (item.OperationType.HasValue)
{
continue;
}
item.OperationType = GetOperationType(item);
}
return(result);
}
private async Task <string> DoPeriodCheckAsync(
IEnumerable <CashOperationLimitation> limits,
LimitationPeriod period,
string clientId,
string asset,
double amount,
CurrencyOperationType currencyOperationType,
bool checkAllCrypto)
{
var periodLimits = limits.Where(l => l.Period == period).ToList();
if (!periodLimits.Any())
{
return(null);
}
(double cashPeriodValue, bool cashOperationsNotCached) = await _cashOperationsCollector.GetCurrentAmountAsync(
clientId,
asset,
period,
currencyOperationType,
checkAllCrypto);
(double transferPeriodValue, bool cashTransfersNotCached) = await _cashTransfersCollector.GetCurrentAmountAsync(
clientId,
asset,
period,
currencyOperationType);
if (cashOperationsNotCached || cashTransfersNotCached)
{
try
{
await _limitOperationsApi.CacheClientDataAsync(clientId, currencyOperationType);
}
catch (Exception ex)
{
_log.Error(ex, context: new { Type = "CachOp", clientId, currencyOperationType });
}
}
var clientLimit = periodLimits.FirstOrDefault(l => l.ClientId == clientId);
if (clientLimit != null)
{
string checkMessage = await CheckLimitAsync(
cashPeriodValue,
transferPeriodValue,
clientLimit,
period,
clientId,
asset,
amount);
if (!string.IsNullOrWhiteSpace(checkMessage))
{
return(checkMessage);
}
}
else
{
foreach (var periodLimit in periodLimits)
{
if (periodLimit.ClientId != null)
{
continue;
}
string checkMessage = await CheckLimitAsync(
cashPeriodValue,
transferPeriodValue,
periodLimit,
period,
clientId,
asset,
amount);
if (!string.IsNullOrWhiteSpace(checkMessage))
{
return(checkMessage);
}
}
}
return(null);
}
