feat: stripe handlers and fetchers

packages/lib/stripe/handlers/checkout-session.ts

@@ -0,0 +1,91 @@
+import { NextApiRequest, NextApiResponse } from "next";
+import prisma from "@documenso/prisma";
+import { stripe } from "../index";
+import { getToken } from "next-auth/jwt";
+
+export type CheckoutSessionRequest = {
+  body: {
+    id: string;
+    priceId: string;
+  };
+};
+
+export type CheckoutSessionResponse =
+  | {
+      success: false;
+      message: string;
+    }
+  | {
+      success: true;
+      url: string;
+    };
+
+export const checkoutSessionHandler = async (req: NextApiRequest, res: NextApiResponse) => {
+  if (!process.env.NEXT_PUBLIC_ALLOW_SUBSCRIPTIONS) {
+    return res.status(500).json({
+      success: false,
+      message: "Subscriptions are not enabled",
+    });
+  }
+
+  if (req.method !== "POST") {
+    return res.status(405).json({
+      success: false,
+      message: "Method not allowed",
+    });
+  }
+
+  const token = await getToken({
+    req,
+  });
+
+  if (!token || !token.email) {
+    return res.status(401).json({
+      success: false,
+      message: "Unauthorized",
+    });
+  }
+
+  const user = await prisma.user.findFirst({
+    where: {
+      email: token.email,
+    },
+  });
+
+  if (!user) {
+    return res.status(404).json({
+      success: false,
+      message: "No user found",
+    });
+  }
+
+  const { id, priceId } = req.body;
+
+  if (typeof id !== "string" || typeof priceId !== "string") {
+    return res.status(400).json({
+      success: false,
+      message: "No id or priceId found in request",
+    });
+  }
+
+  const session = await stripe.checkout.sessions.create({
+    customer: id,
+    client_reference_id: String(user.id),
+    payment_method_types: ["card"],
+    line_items: [
+      {
+        price: priceId,
+        quantity: 1,
+      },
+    ],
+    mode: "subscription",
+    allow_promotion_codes: true,
+    success_url: `${process.env.NEXT_PUBLIC_BASE_URL}/settings/billing?success=true`,
+    cancel_url: `${process.env.NEXT_PUBLIC_BASE_URL}/settings/billing?canceled=true`,
+  });
+
+  return res.status(200).json({
+    success: true,
+    url: session.url,
+  });
+};