Deploying a Self-Hosted OpenAuth Server on Cloudflare Workers

OpenAuth is a standards-based, self-hosted authentication provider designed for flexibility and ease of deployment. By leveraging Cloudflare Workers, you can deploy OpenAuth at the edge, ensuring low-latency authentication services for your applications. This guide walks you through setting up OpenAuth on Cloudflare Workers, utilizing Cloudflare KV for storage.

Prerequisites

Before you begin, ensure you have the following:

Cloudflare Account: Sign up at Cloudflare.
Wrangler CLI: Install Wrangler, Cloudflare's command-line tool, by running:(Cloudflare Docs)

  npm install -g wrangler

Node.js: Ensure you have Node.js version 16.17.0 or later installed.
OpenAuth Package: Install OpenAuth in your project:(Cloudflare Docs)

  npm install @openauthjs/openauth

Step 1: Initialize Your Cloudflare Worker Project

Use Wrangler to create a new Cloudflare Worker project:(Cloudflare Docs)

wrangler init openauth-worker
cd openauth-worker:contentReference[oaicite:40]{index=40}

During initialization, Wrangler will prompt you to select a template. Choose the "Hello World" JavaScript template.

Step 2: Configure OpenAuth with Cloudflare KV Storage

OpenAuth requires a storage solution to manage data such as refresh tokens and password hashes. Cloudflare Workers KV is a suitable choice for this purpose.

2.1 Set Up KV Namespace

In your wrangler.toml file, define a KV namespace:

[[kv_namespaces]]
binding = "OPENAUTH_KV"
id = "your-kv-namespace-id"

Replace "your-kv-namespace-id" with the actual ID of your KV namespace.

2.2 Implement Cloudflare KV Storage Adapter

In your Worker script (e.g., index.js), configure OpenAuth to use Cloudflare KV:(OpenAuth)

import { issuer } from "@openauthjs/openauth";
import { CloudflareStorage } from "@openauthjs/openauth/storage/cloudflare";
import { GithubProvider } from "@openauthjs/openauth/provider/github";
import { PasswordProvider } from "@openauthjs/openauth/provider/password";

const storage = CloudflareStorage({
  namespace: OPENAUTH_KV,
});

const app = issuer({
  providers: {
    github: GithubProvider({
      clientId: "your-github-client-id",
      clientSecret: "your-github-client-secret",
    }),
    password: PasswordProvider(),
  },
  storage,
  subjects: {
    async get(ctx, id) {
      // Implement your logic to retrieve user information
    },
    async create(ctx, profile) {
      // Implement your logic to create a new user
    },
  },
  success: async (ctx, value) => {
    // Handle successful authentication
    return new Response("Authentication successful");
  },
});

export default app;

Ensure you replace "your-github-client-id" and "your-github-client-secret" with your actual GitHub OAuth credentials.

Step 3: Deploy Your Worker

With your project configured, deploy it to Cloudflare Workers:

wrangler publish

Wrangler will upload your Worker script to Cloudflare, and you'll receive a URL where your authentication server is accessible.

Additional Resources

OpenAuth Documentation: Explore detailed guides and API references at openauth.js.org/docs.
Cloudflare Workers KV: Learn more about Cloudflare's key-value storage at developers.cloudflare.com/kv.
Wrangler CLI: Understand how to manage your Workers projects with Wrangler at developers.cloudflare.com/workers/cli-wrangler.(Cloudflare Docs)

By following this guide, you can set up a robust, self-hosted authentication server using OpenAuth on Cloudflare Workers, ensuring scalability and low-latency access for your applications.

Sh Raj @sh20raj