1 files changed, 86 insertions, 0 deletions
diff --git a/api/payments/order.ts b/api/payments/order.ts
new file mode 100644
index 0000000..434abf9
--- /dev/null
+++ b/api/payments/order.ts
@@ -0,0 +1,86 @@
+import type Order from '../types/Order';
+import type { VercelRequest, VercelResponse } from '@vercel/node';
+
+import { paypalCaptureOrder, paypalCreateOrder } from './_paypal';
+
+export default async function handler(request: VercelRequest, response: VercelResponse) {
+  if (request.method === 'POST') {
+    await handlePost(request, response);
+  } else if (request.method === 'PATCH') {
+    await handlePatch(request, response);
+  } else {
+    console.warn('Method was not POST. Method was ' + request.method);
+    response.status(404);
+    return;
+  }
+}
+
+async function handlePost(request: VercelRequest, response: VercelResponse) {
+  const { productDescription, shortDescription, totalPrice }: Partial<Order> = request.body;
+  
+  if (!productDescription) {
+    response.status(400).send('Expected body to contain productDescription, but none provided.');
+  } else if (!shortDescription) {
+    response.status(400).send('Expected body to contain shortDescription, but none provided.');
+  } else if (!totalPrice) {
+    response.status(400).send('Expected body to contain totalPrice, but none provided.');
+  } else {
+    try {
+      const paypalResponse = await paypalCreateOrder({ productDescription, shortDescription, totalPrice });
+
+      const { id, links } = paypalResponse;
+      const isApprovalLink = (o: object) => (
+        'rel' in o &&
+        o.rel === 'approve' &&
+        'href' in o &&
+        typeof(o.href) === 'string' &&
+        o.href.length > 0
+      );
+
+      if (!id || typeof(id) !== 'string' || id.length === 0) {
+        throw new Error(`
+          PayPal did not return the created order ID
+          in an expected format. PayPal returned: ${paypalResponse}
+        `);
+      }
+      if (!links || !('length' in links) || !links.some(isApprovalLink)) {
+        throw new Error(`
+          PayPal did not return the order approval link in
+          an expected format. PayPal returned: ${paypalResponse}
+        `);
+      }
+
+      response.status(201).json({
+        orderId: id,
+        approvalLink: links.find(isApprovalLink).href,
+      });
+    } catch (err) {
+      response.status(500).send(`Internal server error. ${err}`);
+    }
+  }
+}
+
+async function handlePatch(request: VercelRequest, response: VercelResponse) {
+  const { id, isApproved }: Partial<PatchRequestBody> = request.body;
+  
+  if (!id) {
+    response.status(400).send('Expected body to contain id, but none provided.');
+  } else if (!isApproved) {
+    response.status(400).send('Expected body to contain isApproved, but none provided.');
+  } else {
+    try {
+      const paypalResponse = await paypalCaptureOrder(id);
+      response.status(200).json({
+        orderId: paypalResponse.id,
+        paypalStatus: paypalResponse.status,
+      });
+    } catch (err) {
+      response.status(500).send(`Internal server error. ${err}`);
+    }
+  }
+}
+
+type PatchRequestBody = {
+  id: string;
+  isApproved: boolean;
+};