discourse-subscriptions/assets/javascripts/lib/discourse-markdown/stripe.js.es6

function validationErrors(tagInfo, content, siteSettings) {
  let errors = [];
  if (!siteSettings.discourse_donations_public_key) {
    errors.push("missing key (site setting)");
  }
  if (!siteSettings.discourse_donations_currency) {
    errors.push("missing currency (site setting)");
  }
  if (!siteSettings.discourse_donations_shop_name) {
    errors.push("missing name (site setting)");
  }
  if (!siteSettings.discourse_donations_zip_code) {
    errors.push("missing zip code toggle (site setting)");
  }
  if (!siteSettings.discourse_donations_billing_address) {
    errors.push("missing billing address toggle (site setting)");
  }
  if (!tagInfo.attrs["amount"]) {
    errors.push("missing amount");
  }
  if (!content) {
    errors.push("missing description");
  }
  return errors;
}

function replaceWithStripeOrError(siteSettings) {
  return function(state, tagInfo, content) {
    let errors = validationErrors(tagInfo, content, siteSettings);
    if (errors.length) {
      displayErrors(state, errors);
    } else {
      insertCheckout(state, tagInfo, content);
    }
    return true;
  };
}

function displayErrors(state, errors) {
  let token = state.push("div-open", "div", 1);
  token.attrs = [["class", "stripe-errors"]];
  token = state.push("html_inline", "", 0);
  token.content = "Stripe checkout can't be rendered: " + errors.join(", ");
  state.push("div-close", "div", -1);
}

function insertCheckout(state, tagInfo, content) {
  let token = state.push("stripe-checkout-form-open", "form", 1);
  token.attrs = [
    ["method", "POST"],
    ["action", "/checkout"],
    ["content", content],
    ["image", tagInfo.attrs["image"]],
    ["class", "stripe-checkout"]
  ];

  token = state.push("stripe-checkout-form-amount", "input", 0);
  token.attrs = [
    ["type", "hidden"],
    ["name", "amount"],
    ["value", tagInfo.attrs["amount"]]
  ];

  state.push("stripe-checkout-form-close", "form", -1);
}

function setupMarkdownIt(helper, siteSettings) {
  helper.registerPlugin(md => {
    md.inline.bbcode.ruler.push("stripe-checkout", {
      tag: "stripe",
      replace: replaceWithStripeOrError(siteSettings)
    });
  });
}

export function setup(helper) {
  helper.registerOptions((opts, siteSettings) => {
    helper.whiteList([
      "div[class]",
      "form[method]",
      "form[action]",
      "form[class]",
      "form[content]",
      "form[image]",
      "input[type]",
      "input[name]",
      "input[value]",
      "script[class]",
      "script[src]",
      "script[data-key]",
      "script[data-amount]",
      "script[data-name]",
      "script[data-description]",
      "script[data-image]",
      "script[data-zip-code]",
      "script[data-billing-address]",
      "script[data-currency]",
      "script[data-locale]"
    ]);
    if (helper.markdownIt) {
      setupMarkdownIt(helper, siteSettings);
    }
  });
}