//auto generate a unique poster image for every article
const api_key = process.env.API_KEY;
const base = `https://cdn.bannerbear.com/signedurl/${process.env.BASE_ID}/image.jpg`;

let modifications = [
  {
    "name":"title",
    "text": article_title
  },
  {
    "name":"avatar",
    "image_url": author_avatar_url
  }
];

let query = "?modifications=" + base64url(JSON.stringify(modifications));
let signature = crypto.createHmac("sha256", api_key).update(base+query).digest("hex");

let url = base + query + "&s=" + signature;