Initial commit: PodcastYes — AI podcast platform

lib/billing/stripe.ts

@@ -0,0 +1,76 @@
+import Stripe from "stripe";
+import { prisma } from "@/lib/db";
+import { stripePriceId, type BillingInterval } from "./catalog";
+import type { PlanKey } from "./plans";
+
+let client: Stripe | null = null;
+
+export function stripe(): Stripe {
+  if (!client) {
+    const key = process.env.STRIPE_SECRET_KEY;
+    if (!key) throw new Error("STRIPE_SECRET_KEY is not set");
+    client = new Stripe(key);
+  }
+  return client;
+}
+
+export function isStripeConfigured(): boolean {
+  return !!process.env.STRIPE_SECRET_KEY;
+}
+
+const appUrl = () => process.env.NEXT_PUBLIC_APP_URL ?? "http://localhost:3000";
+
+/** Find-or-create the Stripe customer for a user and persist the id. */
+export async function ensureStripeCustomer(user: {
+  id: string;
+  email: string;
+  name: string;
+  stripeCustomerId: string | null;
+}): Promise<string> {
+  if (user.stripeCustomerId) return user.stripeCustomerId;
+  const customer = await stripe().customers.create({
+    email: user.email,
+    name: user.name,
+    metadata: { userId: user.id },
+  });
+  await prisma.user.update({ where: { id: user.id }, data: { stripeCustomerId: customer.id } });
+  return customer.id;
+}
+
+/** Create a Stripe Checkout Session for a subscription; returns the redirect URL. */
+export async function createStripeCheckout(args: {
+  user: { id: string; email: string; name: string; stripeCustomerId: string | null };
+  plan: PlanKey;
+  interval: BillingInterval;
+  subjectId: string;
+  subjectType: "user" | "organization";
+}): Promise<string> {
+  const price = stripePriceId(args.plan, args.interval);
+  if (!price) throw new Error(`No Stripe price configured for ${args.plan}/${args.interval}`);
+  const customer = await ensureStripeCustomer(args.user);
+
+  const session = await stripe().checkout.sessions.create({
+    mode: "subscription",
+    customer,
+    line_items: [{ price, quantity: 1 }],
+    client_reference_id: args.subjectId,
+    metadata: { plan: args.plan, subjectId: args.subjectId, subjectType: args.subjectType },
+    subscription_data: {
+      metadata: { plan: args.plan, subjectId: args.subjectId, subjectType: args.subjectType },
+    },
+    allow_promotion_codes: true,
+    success_url: `${appUrl()}/billing?status=success`,
+    cancel_url: `${appUrl()}/billing?status=cancel`,
+  });
+  if (!session.url) throw new Error("Stripe did not return a checkout URL");
+  return session.url;
+}
+
+/** Create a Stripe Billing Portal session for managing/cancelling a subscription. */
+export async function createStripePortal(customerId: string): Promise<string> {
+  const session = await stripe().billingPortal.sessions.create({
+    customer: customerId,
+    return_url: `${appUrl()}/billing`,
+  });
+  return session.url;
+}