medusa-payment-comgate-jc/src/api/comgate/webhooks/route.ts

Comgate payment gateway provider for MedusaJS

import {
  AbstractCartCompletionStrategy,
  CartService,
  IdempotencyKeyService,
  MedusaRequest,
  MedusaResponse,
  OrderService,
} from "@medusajs/medusa";
import { ComgateStatusRequest } from "../../../types";

import { MedusaError } from "medusa-core-utils";

export const POST = async (req: MedusaRequest, res: MedusaResponse) => {
  try {
    const container = req.scope;
    const requestBody = req.body as ComgateStatusRequest;

    const cartService = container.resolve<CartService>("cartService");
    const orderService = container.resolve<OrderService>("orderService");
    const cartId = "cart_" + requestBody.refId;

    const cart = await cartService.retrieve(cartId).catch(() => undefined);

    if (!cart) {
      res.status(404).send("Api Error: Cart with id " + cartId + " not found.");
      return;
    }

    switch (requestBody.status) {
      case "PAID":
      case "AUTHORIZED": {
        const manager = container.resolve("manager");
        await manager.transaction(async (transactionManager) => {
          await completeCart(
            requestBody.transId,
            cartId,
            container,
            transactionManager
          );
          await capturePayment(cartId, transactionManager, container);
        });
        res.status(200).send();
        return;
        break;
      }
      case "CANCELLED": {
        const order = await orderService
          .retrieveByCartId(cartId)
          .catch(() => undefined);
        if (order) {
          await orderService.cancel(order.id);
        }
        res.status(200).send();
        break;
      }
      default:
        res.sendStatus(204);
        return;
    }
  } catch (err) {
    res.status(400).send(`Api Error: ${err.message}`);
    return;
  }
};

export const GET = async (req: MedusaRequest, res: MedusaResponse) => {
  res.status(200).send({
    status: "OK",
  });
  return;
};

async function completeCart(eventId, cartId, container, transactionManager) {
  const orderService = container.resolve("orderService");

  const order = await orderService
    .retrieveByCartId(cartId)
    .catch(() => undefined);

  if (!order) {
    const completionStrategy: AbstractCartCompletionStrategy =
      container.resolve("cartCompletionStrategy");
    const cartService: CartService = container.resolve("cartService");
    const idempotencyKeyService: IdempotencyKeyService = container.resolve(
      "idempotencyKeyService"
    );
    const idempotencyKeyServiceTx =
      idempotencyKeyService.withTransaction(transactionManager);

    let idempotencyKey = await idempotencyKeyServiceTx
      .retrieve({
        request_path: "/comgate/webhooks",
        idempotency_key: eventId,
      })
      .catch(() => undefined);

    if (!idempotencyKey) {
      idempotencyKey = await idempotencyKeyService
        .withTransaction(transactionManager)
        .create({
          request_path: "/comgate/webhooks",
          idempotency_key: eventId,
        });
    }

    const cart = await cartService
      .withTransaction(transactionManager)
      .retrieve(cartId, { select: ["context"] });

    const { response_code, response_body } = await completionStrategy
      .withTransaction(transactionManager)
      .complete(cartId, idempotencyKey, { ip: cart.context?.ip as string });
    if (response_code !== 200) {
      throw new MedusaError(
        MedusaError.Types.UNEXPECTED_STATE,
        response_body["message"] as string,
        response_body["code"] as string
      );
    }
  }
}

async function capturePayment(cartId, transactionManager, container) {
  const orderService = container.resolve("orderService") as OrderService;
  const order = await orderService
    .withTransaction(transactionManager)
    .retrieveByCartId(cartId)
    .catch(() => undefined);
  if (order?.payment_status !== "captured") {
    await orderService
      .withTransaction(transactionManager)
      .capturePayment(order!.id);
  }
}