shared.ts

import { GiftCard } from "../../shared/types";
import { AccessToken, ReloadlyFailureResponse } from "./types";

export const commonHeaders = {
  "Content-Type": "application/json",
  Accept: "application/com.reloadly.giftcards-v1+json",
};

export interface Env {
  USE_RELOADLY_SANDBOX: string;
  RELOADLY_API_CLIENT_ID: string;
  RELOADLY_API_CLIENT_SECRET: string;
}

export interface ReloadlyAuthResponse {
  access_token: string;
  scope: string;
  expires_in: number;
  token_type: string;
}

export const RELOADLY_AUTH_URL = "https://auth.reloadly.com/oauth/token";
export const RELOADLY_SANDBOX_API_URL = "https://giftcards-sandbox.reloadly.com";
export const RELOADLY_PRODUCTION_API_URL = "https://web3-gateway-test.com/proxy/reloadly/production";
export function getReloadlyApiBaseUrl(isSandbox: boolean): string {
  if (isSandbox === false) {
    return RELOADLY_PRODUCTION_API_URL;
  }
  return RELOADLY_SANDBOX_API_URL;
}

export async function getAccessToken(env: Env): Promise<AccessToken> {
  console.log("Using Reloadly Sandbox:", env.USE_RELOADLY_SANDBOX !== "false");
  const options = {
    method: "POST",
    headers: { "Content-Type": "application/json", Accept: "application/json" },
    body: JSON.stringify({
      client_id: env.RELOADLY_API_CLIENT_ID,
      client_secret: env.RELOADLY_API_CLIENT_SECRET,
      grant_type: "client_credentials",
      audience: env.USE_RELOADLY_SANDBOX === "false" ? "https://giftcards.reloadly.com" : "https://giftcards-sandbox.reloadly.com",
    }),
  };

  const res = await fetch(RELOADLY_AUTH_URL, options);
  if (res.status == 200) {
    const successResponse = (await res.json()) as ReloadlyAuthResponse;
    return {
      token: successResponse.access_token,
      isSandbox: env.USE_RELOADLY_SANDBOX !== "false",
    };
  }
  throw `Getting access token failed: ${JSON.stringify(await res.json())}`;
}

export async function getGiftCards(productQuery: string, country: string, accessToken: AccessToken): Promise<GiftCard[]> {
  // productCategoryId = 1 = Finance.
  // This should prevent mixing of other gift cards with similar keywords
  const url = `${getReloadlyApiBaseUrl(accessToken.isSandbox)}/countries/${country}/products?productName=${productQuery}&productCategoryId=1`;

  console.log(`Retrieving gift cards from ${url}`);
  const options = {
    method: "GET",
    headers: {
      ...commonHeaders,
      Authorization: `Bearer ${accessToken.token}`,
    },
  };

  const response = await fetch(url, options);
  const responseJson = await response.json();

  console.log("Response status", response.status);
  console.log(`Response from ${url}`, responseJson);

  if (response.status == 404) {
    return [];
  }

  if (response.status != 200) {
    throw new Error(
      `Error from Reloadly API: ${JSON.stringify({
        status: response.status,
        message: (responseJson as ReloadlyFailureResponse).message,
      })}`
    );
  }

  return responseJson as GiftCard[];
}