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Airbadge is a Stripe addon for Auth.js that simplifies the process of creating a SaaS site by integrating payment, authentication, gating, self-service account management, webhook handling, trials & free plans, session data, and more. It allows users to launch a SaaS app without writing any authentication or payment code. The project is open source and free to use with optional paid features under the BSL License.

README:

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Stripe + Auth.js + SvelteKit

This project provides an easy way to create a SaaS site.

It is a Stripe addon for Auth.js.

Launch a SaaS app without writing any authentiction or payment code!

Features

  • Integrated Payment: Stripe Checkout is built into the signup flow.
  • Authentication: Over 50 OAuth options (Google, Apple, GitHub...), provided by Auth.js.
  • Gating: Access to routes and components can be restricted based on subscription.
  • Self-service account management: Changing or canceling plans is accessible via /billing/portal.
  • Webhook handling: All Stripe webhooks are handled for you.
  • Trials & Free plans: Checkout can be skipped for free plans or trials.
  • Session data: Subscription and plan data is included in the session.
  • Open source: https://github.com/airbadge-dev/airbadge
  • BSL Licence: Free to use. With optional paid features.

Gating

The session data contains info about the user's subscription & purchase history, so it's easy to gate routes and components in your app.

Gating Routes

To gate routes, check the session.subscription or session.purchases for authorization:

export async function load({ locals }) {
  const session = await locals.getSession()

  // for a subscription, check session.subscription
  if (session?.subscription?.plan != 'pro') {
    error(401, 'Must be on pro plan')
  }

  // alternatively, for one-time purchases, check session.purchases
  if (session?.purchases.includes('e-book')) {
    error(401, 'Please purchase the e-book to continue')
  }


  // do the gated thing here
}

Components

Gating components is similar to gating routes. The same session.subscription & session.purchases data is available.

<script>
  export let data
</script>

{#if data.session?.subscription?.plan == 'pro'}
  Your on the PRO plan!
{/if}

{#if data.session?.purchases.includes('e-book')}
  <a href="/download">Download e-book</a>
{/if}

Billing Endpoint

This package provides a /billing endpoint, similar to how Auth.js provides a /auth endpoint.

The following routes are provided:

  • /billing/checkout: Redirect current user to a Stripe checkout session.
  • /billing/portal: Opens the billing portal for the current signed-in user.
  • /billing/cancel: Cancels the current user's subscription.
  • /billing/webhooks: Handles all Stripe webhooks for you.
  • /billing/modify: Modify the current user's billing plan.
  • /billing/checkout/complete: Handles post-checkout housekeeping.

Setup

Install @airbadge/sveltekit:

pnpm i -D @airbadge/sveltekit

Setup a database provider for Auth.js. For example, follow instructions for Prisma:

https://authjs.dev/reference/adapter/prisma

Add environment variables to .env:

PUBLIC_STRIPE_KEY=pk_...
SECRET_STRIPE_KEY=sk_...
DOMAIN=http://localhost:5173
DATABASE_URL="postgresql://postgres:postgres@localhost:5432/auth_stripe_sveltekit_dev?schema=public"
AUTH_GITHUB_ID=
AUTH_GITHUB_SECRET=

Configure authentication and billing options in src/hooks.server.js:

import { SvelteKitAuth } from '@airbadge/sveltekit'

// use any OAuth provider (or multiple)
import GitHub from '@auth/sveltekit/providers/github'

// import prisma client for Auth.js's database adapter
import { PrismaClient } from '@prisma/client'

// init database client
const db = new PrismaClient()

// add Auth.js + Stripe handler
// API is similar to Auth.js
export const { handle } = SvelteKitAuth({
  // configure database adapter
  adapter: PrismaAdapter(db),

  // configure OAuth providers
  providers: [ GitHub ]
})

Forward Stripe events to localhost:

stripe listen --forward-to localhost:5173/billing/webhooks

License

BSL - Business Software License.

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