feat: add free tier Stripe subscription

packages/ee/server-only/stripe/get-customer.ts

@@ -0,0 +1,19 @@
+import { stripe } from '@documenso/lib/server-only/stripe';
+
+export const getStripeCustomerByEmail = async (email: string) => {
+  const foundStripeCustomers = await stripe.customers.list({
+    email,
+  });
+
+  return foundStripeCustomers.data[0] ?? null;
+};
+
+export const getStripeCustomerById = async (stripeCustomerId: string) => {
+  try {
+    const stripeCustomer = await stripe.customers.retrieve(stripeCustomerId);
+
+    return !stripeCustomer.deleted ? stripeCustomer : null;
+  } catch {
+    return null;
+  }
+};

packages/prisma/migrations/20230918111438_update_subscription_constraints_and_columns/migration.sql

@@ -0,0 +1,17 @@
+/*
+  Warnings:
+
+  - A unique constraint covering the columns `[userId]` on the table `Subscription` will be added. If there are existing duplicate values, this will fail.
+  - Made the column `customerId` on table `Subscription` required. This step will fail if there are existing NULL values in that column.
+
+*/
+
+DELETE FROM "Subscription"
+WHERE "customerId" IS NULL;
+
+-- AlterTable
+ALTER TABLE "Subscription" ADD COLUMN     "cancelAtPeriodEnd" BOOLEAN NOT NULL DEFAULT false,
+ALTER COLUMN "customerId" SET NOT NULL;
+
+-- CreateIndex
+CREATE UNIQUE INDEX "Subscription_userId_key" ON "Subscription"("userId");

packages/prisma/schema.prisma

@@ -51,15 +51,16 @@ enum SubscriptionStatus {
 }
 
 model Subscription {
-  id         Int                @id @default(autoincrement())
-  status     SubscriptionStatus @default(INACTIVE)
-  planId     String?
-  priceId    String?
-  customerId String?
-  periodEnd  DateTime?
-  userId     Int
-  createdAt  DateTime           @default(now())
-  updatedAt  DateTime           @updatedAt
+  id                Int                @id @default(autoincrement())
+  status            SubscriptionStatus @default(INACTIVE)
+  planId            String?
+  priceId           String?
+  customerId        String
+  periodEnd         DateTime?
+  userId            Int                @unique
+  createdAt         DateTime           @default(now())
+  updatedAt         DateTime           @updatedAt
+  cancelAtPeriodEnd Boolean            @default(false)
 
   User User @relation(fields: [userId], references: [id], onDelete: Cascade)
 

packages/tsconfig/process-env.d.ts

@@ -10,6 +10,7 @@ declare namespace NodeJS {
 
     NEXT_PUBLIC_STRIPE_COMMUNITY_PLAN_MONTHLY_PRICE_ID: string;
     NEXT_PUBLIC_STRIPE_COMMUNITY_PLAN_YEARLY_PRICE_ID: string;
+    NEXT_PUBLIC_STRIPE_FREE_PLAN_ID?: string;
 
     NEXT_PRIVATE_STRIPE_API_KEY: string;
     NEXT_PRIVATE_STRIPE_WEBHOOK_SECRET: string;