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NovickVitaliyNovickVitaliy
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Feature/issue 236 (#282)
* feat: implement donation functionality * feat: add unit tests * feat: add integration tests * feat: add support for return url * feat: make changes according to the code rabbit suggestions * add fixes * small fixes * fix cors * fix comments * fix tests
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‎VictoryCenter/VictoryCenter.BLL/Commands/Payment/Common/IPaymentCommandHandler.cs‎

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using MediatR;
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namespace VictoryCenter.BLL.Commands.Payment.Common;
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public interface IPaymentCommandHandler<in TRequest, TResult> : IRequestHandler<TRequest, TResult>
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where TRequest : IRequest<TResult>
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{
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}

‎VictoryCenter/VictoryCenter.BLL/Commands/Payment/Common/PaymentCommand.cs‎

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using FluentResults;
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using MediatR;
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using VictoryCenter.BLL.DTOs.Payment.Common;
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namespace VictoryCenter.BLL.Commands.Payment.Common;
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public record PaymentCommand(PaymentRequestDto Request) : IRequest<Result<PaymentResponseDto>>;

‎VictoryCenter/VictoryCenter.BLL/Commands/Payment/WayForPay/WayForPayPaymentCommandHandler.cs‎

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using System.Globalization;
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using System.Net;
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using System.Security.Cryptography;
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using System.Text;
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using FluentResults;
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using Microsoft.Extensions.Logging;
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using Microsoft.Extensions.Options;
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using VictoryCenter.BLL.Commands.Payment.Common;
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using VictoryCenter.BLL.Constants;
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using VictoryCenter.BLL.DTOs.Payment.Common;
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using VictoryCenter.BLL.DTOs.Payment.WayForPay;
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using VictoryCenter.BLL.Options.Payment;
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namespace VictoryCenter.BLL.Commands.Payment.WayForPay;
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public class WayForPayPaymentCommandHandler : IPaymentCommandHandler<PaymentCommand, Result<PaymentResponseDto>>
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{
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private readonly IOptions<WayForPayOptions> _way4PayOptions;
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private readonly IHttpClientFactory _httpClientFactory;
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private readonly ILogger<WayForPayPaymentCommandHandler> _logger;
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public WayForPayPaymentCommandHandler(IOptions<WayForPayOptions> way4PayOptions, IHttpClientFactory httpClientFactory, ILogger<WayForPayPaymentCommandHandler> logger)
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{
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_way4PayOptions = way4PayOptions;
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_httpClientFactory = httpClientFactory;
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_logger = logger;
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}
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public async Task<Result<PaymentResponseDto>> Handle(PaymentCommand request, CancellationToken cancellationToken)
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{
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var orderReference = Guid.CreateVersion7();
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var orderDate = DateTimeOffset.UtcNow.ToUnixTimeSeconds();
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var merchantSignature = GenerateMerchantSignature(request, orderReference, orderDate);
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var purchaseRequest = new WayForPayPurchaseRequest()
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{
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Amount = request.Request.Amount,
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Currency = request.Request.Currency,
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MerchantAccount = _way4PayOptions.Value.MerchantLogin,
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MerchantDomainName = _way4PayOptions.Value.MerchantDomainName,
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OrderDate = orderDate,
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OrderReference = orderReference.ToString(),
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ProductCount = [1],
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ProductName = [PaymentConstants.ProductName],
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ProductPrice = [request.Request.Amount],
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MerchantSignature = merchantSignature,
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ReturnUrl = request.Request.ReturnUrl
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};
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// regular payment is going to be supported in the future
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// if (request.Request.IsSubscription)
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// {
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// purchaseRequest.RegularBehavior = PaymentConstants.RegularPaymentBehaviour;
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// purchaseRequest.RegularAmount = request.Request.Amount;
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// purchaseRequest.RegularMode = PaymentConstants.RegularPaymentMode;
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// purchaseRequest.RegularOn = true;
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// }
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var keyValues = new Dictionary<string, string>
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{
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["merchantAccount"] = purchaseRequest.MerchantAccount,
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["merchantDomainName"] = purchaseRequest.MerchantDomainName,
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["orderReference"] = purchaseRequest.OrderReference,
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["orderDate"] = purchaseRequest.OrderDate.ToString(),
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["amount"] = purchaseRequest.Amount.ToString(CultureInfo.InvariantCulture),
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["currency"] = purchaseRequest.Currency.ToString(),
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["productName[]"] = purchaseRequest.ProductName[0],
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["productCount[]"] = purchaseRequest.ProductCount[0].ToString(CultureInfo.InvariantCulture),
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["productPrice[]"] = purchaseRequest.ProductPrice[0].ToString(CultureInfo.InvariantCulture),
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["merchantSignature"] = purchaseRequest.MerchantSignature,
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};
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// regular payment is going to be supported in the future
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// if (purchaseRequest.RegularOn.HasValue && purchaseRequest.RegularOn.Value)
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// {
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// keyValues["regularOn"] = "1";
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// keyValues["regularAmount"] = purchaseRequest.RegularAmount?.ToString(CultureInfo.InvariantCulture) ?? purchaseRequest.Amount.ToString(CultureInfo.InvariantCulture);
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// keyValues["regularMode"] = purchaseRequest.RegularMode!;
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// keyValues["regularBehavior"] = purchaseRequest.RegularBehavior!;
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// keyValues["regularCount"] = PaymentConstants.RegularPaymentCount;
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// }
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if (!string.IsNullOrWhiteSpace(purchaseRequest.ReturnUrl))
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{
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keyValues["returnUrl"] = purchaseRequest.ReturnUrl;
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}
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var content = new FormUrlEncodedContent(keyValues);
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var client = _httpClientFactory.CreateClient("Way4PayClient");
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var httpRequestMessage = new HttpRequestMessage()
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{
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RequestUri = new Uri(_way4PayOptions.Value.ApiUrl),
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Method = HttpMethod.Post,
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Content = content
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};
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try
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{
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var response = await client.SendAsync(httpRequestMessage, cancellationToken);
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if (response.StatusCode is HttpStatusCode.Found or HttpStatusCode.SeeOther or HttpStatusCode.Moved)
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{
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var paymentUrl = response.Headers.Location?.ToString();
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if (!string.IsNullOrEmpty(paymentUrl))
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{
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return Result.Ok(new PaymentResponseDto()
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{
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PaymentUrl = paymentUrl
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});
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}
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}
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return Result.Fail(response.ReasonPhrase ?? PaymentConstants.PaymentRequestFailedWithStatus(response.StatusCode));
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}
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catch (HttpRequestException ex)
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{
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_logger.LogError(ex, "Error occured when processing payment request: {ErrorMessage}", ex.Message);
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return Result.Fail(PaymentConstants.FailedToCommunicateWithPaymentGateway(ex.Message));
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}
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catch (TaskCanceledException ex)
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{
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_logger.LogError(ex, PaymentConstants.PaymentRequestWasCancelledOrTimedOut);
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return Result.Fail(PaymentConstants.PaymentRequestWasCancelledOrTimedOut);
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}
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}
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private string GenerateMerchantSignature(PaymentCommand request, Guid orderReference, long orderDate)
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{
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var concatenatedValues = string.Join(
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';',
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_way4PayOptions.Value.MerchantLogin,
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_way4PayOptions.Value.MerchantDomainName,
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orderReference,
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orderDate,
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request.Request.Amount.ToString(CultureInfo.InvariantCulture),
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request.Request.Currency,
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PaymentConstants.ProductName,
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1,
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request.Request.Amount.ToString(CultureInfo.InvariantCulture));
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var secretKeyBytes = Encoding.UTF8.GetBytes(_way4PayOptions.Value.MerchantSecretKey);
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var signatureBytes = Encoding.UTF8.GetBytes(concatenatedValues);
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using var hmac = new HMACMD5(secretKeyBytes);
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var bytes = hmac.ComputeHash(signatureBytes);
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var sb = new StringBuilder(bytes.Length * 2);
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foreach (var b in bytes)
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{
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sb.Append(b.ToString("x2"));
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}
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return sb.ToString();
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}
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}

‎VictoryCenter/VictoryCenter.BLL/Constants/ErrorMessagesConstants.cs‎

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? $"{property} must be in a valid format"
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: $"{property} must be in a valid format of {format}";
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}
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public static string PropertyMustHaveALengthOfNCharacters(string property, int length)
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{
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return $"{property} must have a length of {length} characters";
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}
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public static string PropertyMustBeValidEnum(string property)
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{
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return $"{property} must be a valid value";
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}
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}

‎VictoryCenter/VictoryCenter.BLL/Constants/PaymentConstants.cs‎

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using System.Net;
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namespace VictoryCenter.BLL.Constants;
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public static class PaymentConstants
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{
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public static readonly string ChosenPaymentSystemIsNotSupported = "Chosen payment system is not supported";
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public static readonly string ProductName = "Донат";
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public static readonly string RegularPaymentBehaviour = "preset";
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public static readonly string RegularPaymentMode = "monthly";
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public static readonly string RegularPaymentCount = "12";
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public static readonly string PaymentUrlIsNotAvailable = "Payment URL is not available";
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public static readonly string UnableToConductDonation = "Unable to conduct donation";
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public static readonly string PaymentRequestWasCancelledOrTimedOut = "Payment request was cancelled or timed out";
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public static string PaymentRequestFailedWithStatus(HttpStatusCode status)
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{
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return $"Payment request failed with status: {status}";
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}
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public static string FailedToCommunicateWithPaymentGateway(string errorMessage)
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{
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return $"Failed to communicate with payment gateway: {errorMessage}";
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}
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}

‎VictoryCenter/VictoryCenter.BLL/DTOs/Payment/Common/PaymentRequestDto.cs‎

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namespace VictoryCenter.BLL.DTOs.Payment.Common;
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public record PaymentRequestDto
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{
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public decimal Amount { get; init; }
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public Currency Currency { get; init; }
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public bool IsSubscription { get; init; }
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public PaymentSystem PaymentSystem { get; init; }
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public string? ReturnUrl { get; init; }
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}

‎VictoryCenter/VictoryCenter.BLL/DTOs/Payment/Common/PaymentResponseDto.cs‎

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namespace VictoryCenter.BLL.DTOs.Payment.Common;
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public record PaymentResponseDto
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{
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public string PaymentUrl { get; init; } = null!;
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}

‎VictoryCenter/VictoryCenter.BLL/DTOs/Payment/Currency.cs‎

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using System.Text.Json.Serialization;
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namespace VictoryCenter.BLL.DTOs.Payment;
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[JsonConverter(typeof(JsonStringEnumConverter))]
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public enum Currency
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{
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UAH,
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USD,
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EUR
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}

‎VictoryCenter/VictoryCenter.BLL/DTOs/Payment/PaymentSystem.cs‎

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using System.Text.Json.Serialization;
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namespace VictoryCenter.BLL.DTOs.Payment;
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[JsonConverter(typeof(JsonStringEnumConverter))]
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public enum PaymentSystem
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{
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WayForPay
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}

‎VictoryCenter/VictoryCenter.BLL/DTOs/Payment/WayForPay/WayForPayPurchaseRequest.cs‎

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namespace VictoryCenter.BLL.DTOs.Payment.WayForPay;
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public class WayForPayPurchaseRequest
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{
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required public string MerchantAccount { get; init; }
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required public string MerchantDomainName { get; init; }
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required public string MerchantSignature { get; init; }
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required public string OrderReference { get; init; }
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required public long OrderDate { get; init; }
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required public decimal Amount { get; init; }
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required public Currency Currency { get; init; }
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required public string[] ProductName { get; init; }
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required public decimal[] ProductPrice { get; init; }
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required public int[] ProductCount { get; init; }
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public string? ReturnUrl { get; set; }
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public string? ServiceUrl { get; set; }
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public string? RegularBehavior { get; set; }
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public string? RegularMode { get; set; }
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public decimal? RegularAmount { get; set; }
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public bool? RegularOn { get; set; }
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}

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