feat: add free tier Stripe subscription

apps/web/src/app/(dashboard)/settings/billing/create-billing-portal.action.ts

@@ -0,0 +1,80 @@
+'use server';
+
+import {
+  getStripeCustomerByEmail,
+  getStripeCustomerById,
+} from '@documenso/ee/server-only/stripe/get-customer';
+import { getPortalSession } from '@documenso/ee/server-only/stripe/get-portal-session';
+import { getRequiredServerComponentSession } from '@documenso/lib/next-auth/get-server-session';
+import { Stripe, stripe } from '@documenso/lib/server-only/stripe';
+import { getSubscriptionByUserId } from '@documenso/lib/server-only/subscription/get-subscription-by-user-id';
+import { prisma } from '@documenso/prisma';
+
+export const createBillingPortal = async () => {
+  const user = await getRequiredServerComponentSession();
+
+  const existingSubscription = await getSubscriptionByUserId({ userId: user.id });
+
+  let stripeCustomer: Stripe.Customer | null = null;
+
+  // Find the Stripe customer for the current user subscription.
+  if (existingSubscription) {
+    stripeCustomer = await getStripeCustomerById(existingSubscription.customerId);
+
+    if (!stripeCustomer) {
+      throw new Error('Missing Stripe customer for subscription');
+    }
+  }
+
+  // Fallback to check if a Stripe customer already exists for the current user.
+  stripeCustomer = await getStripeCustomerByEmail(user.email);
+
+  // Create a Stripe customer if it does not exist for the current user.
+  if (!stripeCustomer) {
+    stripeCustomer = await stripe.customers.create({
+      name: user.name ?? undefined,
+      email: user.email,
+      metadata: {
+        userId: user.id,
+      },
+    });
+  }
+
+  const stripeCustomerSubsriptions = stripeCustomer.subscriptions?.data ?? [];
+
+  // Create a free subscription for user if it does not exist.
+  if (!existingSubscription && stripeCustomerSubsriptions.length === 0) {
+    const newSubscription = await stripe.subscriptions.create({
+      customer: stripeCustomer.id,
+      items: [
+        {
+          plan: process.env.NEXT_PUBLIC_STRIPE_FREE_PLAN_ID,
+        },
+      ],
+    });
+
+    await prisma.subscription.upsert({
+      where: {
+        userId: user.id,
+        customerId: stripeCustomer.id,
+      },
+      create: {
+        userId: user.id,
+        customerId: stripeCustomer.id,
+        planId: process.env.NEXT_PUBLIC_STRIPE_FREE_PLAN_ID,
+        periodEnd: new Date(newSubscription.current_period_end * 1000),
+        status: 'ACTIVE',
+      },
+      update: {
+        planId: process.env.NEXT_PUBLIC_STRIPE_FREE_PLAN_ID,
+        periodEnd: new Date(newSubscription.current_period_end * 1000),
+        status: 'ACTIVE',
+      },
+    });
+  }
+
+  return getPortalSession({
+    customerId: stripeCustomer.id,
+    returnUrl: `${process.env.NEXT_PUBLIC_APP_URL}/settings/billing`,
+  });
+};