Generate JWT access token in App Builder action

const fetch = require("node-fetch");
const { Core } = require("@adobe/aio-sdk");
const { errorResponse, stringParameters, checkMissingRequestInputs } = require("../utils");
const auth = require("@adobe/jwt-auth");

async function main(params) {
  const logger = Core.Logger("main", { level: params.LOG_LEVEL || "info" });

  try {
    // Perform any necessary input error checking
    const systemErrorMessage = checkMissingRequestInputs(params, [
            "JWT_CLIENT_ID", "JWT_TECHNICAL_ACCOUNT_ID", "JWT_IMS_ORG", "JWT_CLIENT_SECRET", "JWT_METASCOPES", "JWT_PRIVATE_KEY"], []);

    // Split the metascopes into an array (they are comma delimited in the .env file)
    const metascopes = params.JWT_METASCOPES?.split(',') || [];

    // Base64 decode the private key value
    const privateKey = Buffer.from(params.JWT_PRIVATE_KEY, 'base64').toString('utf-8');

    // Exchange the JWT credentials for an 24-hour Access Token
    let { accessToken } = await auth({
      clientId: params.JWT_CLIENT_ID,                          // Client Id
      technicalAccountId: params.JWT_TECHNICAL_ACCOUNT_ID,     // Technical Account Id
      orgId: params.JWT_IMS_ORG,                               // Adobe IMS Org Id
      clientSecret: params.JWT_CLIENT_SECRET,                  // Client Secret
      metaScopes: metascopes,                                  // Metadcopes defining level of access the access token should provide
      privateKey: privateKey,                                  // Private Key to sign the JWT
    });

    // The 24-hour IMS Access Token is used to call the Analytics APIs
    // Can look at caching this token for 24 hours to reduce calls
    const accessToken = await getAccessToken(params);

    // Invoke an exmaple Adobe API endpoint using the generated accessToken
    const res = await fetch('https://analytics.adobe.io/api/example/reports', {
      headers: {
        "Accept": "application/json",
        "Content-Type": "application/json",
        "X-Proxy-Global-Company-Id": 'example',
        "Authorization": `Bearer ${accessToken}`,
        "x-Api-Key": params.JWT_CLIENT_ID,
      },
      method: "POST",
      body: JSON.stringify({... An Analytics query ... }),
    });

    if (!res.ok) { throw new Error("Request to API failed with status code " + res.status);}

    // Analytics API data
    let data = await res.json();

    const response = {
      statusCode: 200,
      body: data,
    };

    return response;
  } catch (error) {
    logger.error(error);
    return errorResponse(500, "server error", logger);
  }
}

exports.main = main;