fix: tidy stripe feature and add provider

packages/lib/stripe/guards/subscriptions.ts

@@ -0,0 +1,35 @@
+import { GetServerSideProps, GetServerSidePropsContext, NextApiRequest } from "next";
+import { SubscriptionStatus } from "@prisma/client";
+import { getToken } from "next-auth/jwt";
+
+export const isSubscriptionsEnabled = () => {
+  return process.env.NEXT_PUBLIC_ALLOW_SUBSCRIPTIONS === "true";
+};
+
+export const isSubscribedServer = async (
+  req: NextApiRequest | GetServerSidePropsContext["req"]
+) => {
+  const { default: prisma } = await import("@documenso/prisma");
+
+  if (!isSubscriptionsEnabled()) {
+    return true;
+  }
+
+  const token = await getToken({
+    req,
+  });
+
+  if (!token || !token.email) {
+    return false;
+  }
+
+  const subscription = await prisma.subscription.findFirst({
+    where: {
+      User: {
+        email: token.email,
+      },
+    },
+  });
+
+  return subscription !== null && subscription.status !== SubscriptionStatus.INACTIVE;
+};