feat(ads): collect ad details at Dodo checkout

api/ad-checkout.js

@@ -0,0 +1,80 @@
+const DODO_API = 'https://test.dodopayments.com';
+
+const PRODUCTS = new Map([
+  ['top', 'pdt_0Nqt0672sYJEtrkIb2K6m'],
+  ['second', 'pdt_0Nqt069LgdQFPo1tFS1yF'],
+]);
+
+const FIELDS = [
+  {
+    key: 'ad_name',
+    label: 'Name on the ad',
+    field_type: 'text',
+    placeholder: 'Acme Invoices',
+    required: true,
+  },
+  {
+    key: 'ad_link',
+    label: 'Link',
+    field_type: 'url',
+    placeholder: 'https://example.com',
+    required: true,
+  },
+  {
+    key: 'ad_logo',
+    label: 'Logo link (square SVG or PNG)',
+    field_type: 'url',
+    placeholder: 'https://example.com/logo.svg',
+    required: true,
+  },
+];
+
+function redirect(location) {
+  return new Response(null, {
+    status: 303,
+    headers: { Location: location, 'Cache-Control': 'no-store' },
+  });
+}
+
+async function createCheckout(productId, page) {
+  const response = await fetch(`${DODO_API}/checkouts`, {
+    method: 'POST',
+    headers: {
+      Authorization: `Bearer ${process.env.DODO_PAYMENTS_API_KEY}`,
+      'Content-Type': 'application/json',
+    },
+    body: JSON.stringify({
+      product_cart: [{ product_id: productId, quantity: 1 }],
+      custom_fields: FIELDS,
+      return_url: `${page}?paid=1`,
+      cancel_url: `${page}#pricing`,
+    }),
+    signal: AbortSignal.timeout(10000),
+  });
+  const body = await response.text();
+  if (!response.ok) {
+    throw new Error(`Dodo returned ${response.status}: ${body}`);
+  }
+  const { checkout_url } = JSON.parse(body);
+  if (
+    typeof checkout_url !== 'string' ||
+    !checkout_url.startsWith('https://')
+  ) {
+    throw new Error(`Dodo returned no checkout URL: ${body}`);
+  }
+  return checkout_url;
+}
+
+export async function GET(request) {
+  const url = new URL(request.url);
+  const page = `${url.origin}/advertise`;
+  const productId = PRODUCTS.get(url.searchParams.get('row'));
+  if (!productId) return redirect(`${page}#pricing`);
+
+  try {
+    return redirect(await createCheckout(productId, page));
+  } catch (error) {
+    console.error(error);
+    return redirect(`${page}?checkout=failed`);
+  }
+}