dsc-api/src/modules/payments/gateways/zarinpal.gateway.ts

import { HttpService } from "@nestjs/axios";
import { Inject, Injectable, InternalServerErrorException, Logger } from "@nestjs/common";
import { AxiosError } from "axios";
import { catchError, firstValueFrom } from "rxjs";

import { PaymentMessage } from "../../../common/enums/message.enum";
import { IZarinpalConfig } from "../../../configs/zarinpal.config";
import { ZARINPAL_CONFIG } from "../constants";
import { GatewayEnum } from "../enums/gateway.enum";
import {
  IPaymentGateway,
  IPaymentVerifyParams,
  IProcessPaymentParams,
  ZarinPalPGNewArgs,
  ZarinPalPGNewRequestData,
  ZarinPalPGVerifyData,
} from "../interfaces/IPayment";

@Injectable()
export class ZarinpalGateway implements IPaymentGateway {
  private readonly logger = new Logger(ZarinpalGateway.name);
  private readonly gatewayApiUrl: string;
  private readonly requestHeader: Record<string, string> = { "Content-Type": "application/json", Accept: "application/json" };

  constructor(
    @Inject(ZARINPAL_CONFIG) private readonly config: IZarinpalConfig,
    private readonly httpService: HttpService,
  ) {
    this.gatewayApiUrl = `https://${this.config.ipgType}.${this.config.gatewayApiUrl}`;
  }
  //*************************************** */
  async processPayment(processParams: IProcessPaymentParams) {
    try {
      const purchaseData: ZarinPalPGNewArgs = {
        merchant_id: this.config.merchantId,
        amount: processParams.amount,
        callback_url: `${this.config.callBackUrl}/${GatewayEnum.ZARINPAL}${processParams.invoiceId ? "/" + processParams.invoiceId : ""}`,
        description: processParams.description,
        currency: "IRT",
        metadata: { email: processParams.email, mobile: processParams.mobile },
      };

      const { data } = await firstValueFrom(
        this.httpService
          .post<ZarinPalPGNewRequestData>(`${this.gatewayApiUrl}/v4/payment/request.json`, purchaseData, {
            headers: this.requestHeader,
          })
          .pipe(
            catchError((err: AxiosError) => {
              this.logger.error(err);
              throw new InternalServerErrorException(PaymentMessage.ERROR_IN_PROCESS_PAYMENT);
            }),
          ),
      );
      return {
        redirectUrl: `${this.gatewayApiUrl}/StartPay/${data.data.authority}`,
        message: data.data.message,
        reference: data.data.authority,
      };
    } catch (error) {
      this.logger.error(error);
      throw new InternalServerErrorException(PaymentMessage.ERROR_IN_PROCESS_PAYMENT);
    }
  }
  //********************************** */
  async verifyPayment(verifyParams: IPaymentVerifyParams) {
    try {
      const verifyData = {
        authority: verifyParams.reference,
        amount: verifyParams.amount,
        merchant_id: this.config.merchantId,
      };
      const { data } = await firstValueFrom(
        this.httpService
          .post<ZarinPalPGVerifyData>(`${this.gatewayApiUrl}/v4/payment/verify.json`, verifyData, { headers: this.requestHeader })
          .pipe(
            catchError((err: AxiosError) => {
              this.logger.error(err);
              throw new InternalServerErrorException(PaymentMessage.ERROR_IN_VERIFY_PAYMENT);
            }),
          ),
      );

      return {
        code: data.data.code,
        message: data.data.message,
        card_hash: data.data.card_hash,
        card_pan: data.data.card_pan,
        ref_id: data.data.ref_id,
        fee_type: data.data.fee_type,
        fee: data.data.fee,
      };
    } catch (error) {
      console.error({ error });
      this.logger.error(error);
      throw new InternalServerErrorException(PaymentMessage.ERROR_IN_VERIFY_PAYMENT);
    }
  }
}