fix: Fix license generation on vercel

jest.config.js

@@ -0,0 +1,5 @@
+/** @type {import('ts-jest/dist/types').InitialOptionsTsJest} */
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+};

package.json

@@ -11,7 +11,8 @@
 		"build": "next build",
 		"gen:license": "ts-node -P scripts/tsconfig.json scripts/license.ts",
 		"lint": "tsc --noEmit && eslint . --ext js,ts,tsx",
-		"start": "next start"
+		"start": "next start",
+		"test": "jest"
 	},
 	"dependencies": {
 		"@geist-ui/react": "^2.1.5",
@@ -43,7 +44,11 @@
 	},
 	"devDependencies": {
 		"@amaurym/config": "^1.3.6",
+		"@types/jest": "^29.0.0",
+		"dotenv": "^16.0.2",
 		"eslint-config-next": "^12.2.5",
+		"jest": "^29.0.1",
+		"ts-jest": "^28.0.8",
 		"typescript": "^4.8.2",
 		"vercel": "^28.2.0"
 	}

src/pages/api/stripe/webhooks.test.ts

@@ -0,0 +1,73 @@
+import axios from 'axios';
+import dotenv from 'dotenv';
+import path from 'path';
+import Stripe from 'stripe';
+
+import { getURL } from '../../../util/helpers';
+import { stripe } from '../../../util/stripeServer';
+
+const invoiceSucceededEvent: Stripe.Event = {
+	id: 'evt_foobar',
+	object: 'event',
+	api_version: '2020-08-27',
+	created: 1661681895,
+	data: {
+		object: {
+			created: 1661681895,
+			customer: 'cus_foobar',
+			customer_address: {
+				city: 'Foo City',
+				country: 'Bar Country',
+				line1: 'Foobar Street 1',
+				line2: '',
+				postal_code: 'FO123',
+				state: '',
+			},
+			customer_email: '[email protected]',
+			customer_name: 'Mr. Foo Bar',
+			total: 39900,
+		},
+	},
+	livemode: false,
+	pending_webhooks: 0,
+	request: {
+		id: null,
+		idempotency_key: null,
+	},
+	type: 'invoice.payment_succeeded',
+};
+
+describe('/api/stripe/webhooks', () => {
+	/**
+	 * This test requires a server running on `getURL()`. Skipped by default.
+	 */
+	it.skip('sends an email on invoice payment succeeded', async () => {
+		dotenv.config({
+			path: path.resolve(process.cwd(), '.env.development.local'),
+		});
+
+		// https://stackoverflow.com/questions/65306706/writing-unit-tests-for-stripe-webhooks-stripe-signature
+		const payloadString = JSON.stringify(invoiceSucceededEvent, null, 2);
+		const secret = process.env.STRIPE_WEBHOOK_SECRET_LIVE as string;
+		const header = stripe.webhooks.generateTestHeaderString({
+			payload: payloadString,
+			secret,
+		});
+
+		// This sends to localhost:3000 on your local machine, but to the Vercel
+		// deployment during CI.
+		const { data } = await axios.post<{
+			received: boolean;
+			error?: string;
+		}>(`${getURL()}/api/stripe/webhooks`, payloadString, {
+			headers: {
+				'stripe-signature': header,
+			},
+		});
+
+		expect(data.error).toBeUndefined();
+		expect(data.received).toEqual(true);
+	});
+});
+
+export {};

src/pages/api/stripe/webhooks.ts

@@ -138,11 +138,7 @@ const webhookHandler = async (
 							return;
 						}
 
-						if (!invoice.customer_name) {
-							throw new Error(
-								'customer_name is empty in invoice'
-							);
-						}
+						const customerName = await getCustomerName(invoice);
 
 						// Generate PDF with the given info.
 						const stripeBuyDate = new Date(invoice.created * 1000);
@@ -153,7 +149,7 @@ const webhookHandler = async (
 							license_end_date: licenseEndDate,
 							number_devs: 8,
 							stripe_buy_date: stripeBuyDate,
-							stripe_buyer_name: invoice.customer_name,
+							stripe_buyer_name: customerName,
 							stripe_buyer_email: invoice.customer_email,
 							stripe_buyer_address: stripeAddressToString(
 								invoice.customer_address
@@ -163,12 +159,12 @@ const webhookHandler = async (
 						// Send the email with the attached PDF.
 						const data = {
 							from: 'Amaury <[email protected]>',
-							to: 'amaury@reacher.email',
+							to: 'test@reacher.email', // TODO Change to real recipient
 							subject: `Reacher Commercial License: ${format(
 								stripeBuyDate,
 								'dd/MM/yyyy'
 							)} to ${format(licenseEndDate, 'dd/MM/yyyy')}`,
-							text: `Hello ${invoice.customer_name},
+							text: `Hello ${customerName},
 
 Thank you for using Reacher. You will find attached the Commercial License for the period of ${format(
 								stripeBuyDate,
@@ -243,4 +239,22 @@ function stripeAddressToString(addr: Stripe.Address | null): string {
 		.join(', ');
 }
 
+// / Stripe invoice object doesn't always include the customer name. If it's
+// not present, we make an additional API call.
+async function getCustomerName(invoice: Stripe.Invoice): Promise<string> {
+	if (invoice.customer_name) {
+		return invoice.customer_name;
+	}
+
+	try {
+		const c = (await stripe.customers.retrieve(
+			invoice.customer as string
+		)) as Stripe.Customer;
+
+		return c.name || 'Reacher customer';
+	} catch (e) {
+		return 'Reacher customer';
+	}
+}
+
 export default withSentry(webhookHandler);

src/pages/api/v0/check_email.ts

@@ -1,7 +1,7 @@
 import type { CheckEmailInput, CheckEmailOutput } from '@reacherhq/api';
 import { withSentry } from '@sentry/nextjs';
 import { User } from '@supabase/supabase-js';
-import axios, { AxiosError, AxiosRequestHeaders } from 'axios';
+import axios, { AxiosError } from 'axios';
 import Cors from 'cors';
 import { addMonths, differenceInMilliseconds, parseISO } from 'date-fns';
 import { NextApiRequest, NextApiResponse } from 'next';

src/util/license.ts

@@ -1,7 +1,7 @@
 import axios from 'axios';
 import { format } from 'date-fns';
 import mdPdf from 'markdown-pdf';
-import { render } from 'mustache';
+import mustache from 'mustache';
 
 const LICENSE_TEMPLATE =
 	'https://raw.githubusercontent.com/reacherhq/policies/master/license/commercial.en.md';
@@ -58,7 +58,7 @@ export async function generateLicense(
 	const { data: template } = await axios.get<string>(LICENSE_TEMPLATE);
 
 	// Format date nicely.
-	const filledMd = render(template, {
+	const filledMd = mustache.render(template, {
 		...metadata,
 		license_end_date: format(metadata.license_end_date, 'MMMM dd yyyy'),
 		number_devs: '8 (eight)', // For now we hardcode to 8.