A modular authentication library for Val Town with support for multiple OAuth providers.

This implementation provides a complete GitHub OAuth 2.0 flow with the following features:

• GitHub OAuth 2.0 Authorization Code Flow - Secure OAuth implementation
• JWT-based Session Management - Stateless authentication tokens
• CSRF Protection - State parameter validation to prevent attacks
• Secure HTTP-only Cookies - Prevents XSS token theft
• Hono Middleware - Easy integration with Hono applications
• React Hooks & Components - Ready-to-use frontend components
• Modular Architecture - Adapter pattern for multiple auth providers

auth/
├── core/
│   ├── types.ts           # TypeScript interfaces
│   ├── signer.ts          # JWT signing/verification
│   └── adapters.ts        # Auth provider implementations
├── hono/
│   ├── createMiddleware.ts # Middleware factory
│   └── github.ts          # GitHub-specific routes
├── react/
│   ├── createHook.ts      # React hook factory
│   ├── createComponents.ts # Component factory
│   └── github.tsx         # GitHub components
└── index.ts               # Main exports

1. Environment Variables

   GITHUB_CLIENT_ID=your_github_client_id
   GITHUB_CLIENT_SECRET=your_github_client_secret
   JWT_SECRET=your_secure_jwt_secret

2. GitHub OAuth App Configuration

   • Authorization callback URL: https://your-domain.com/auth/github/callback
   • Requested scopes: user:email, read:user

import { Hono } from "hono";
import { createGitHubAuthRoutes, githubAuthMiddleware } from "./auth/hono/github.ts";

const app = new Hono();

// Add auth routes
const authRoutes = createGitHubAuthRoutes();
app.route("/", authRoutes);

// Protect API routes
app.get("/api/me", githubAuthMiddleware, (c) => {
  const user = c.get("user");
  return c.json(user);
});

• CSRF Protection: State parameter validation
• Secure Cookies: HttpOnly, Secure, SameSite=Lax
• JWT Validation: Proper token verification with expiration
• Environment Variables: No hardcoded secrets
• Error Handling: Proper error bubbling and logging

• Val Town Adapter: Throws "not implemented" error
• Password Adapter: Throws "not implemented" error

These will be implemented in future steps.

Run the main.tsx file to see a working demonstration of the GitHub OAuth flow with a beautiful UI built using React and TailwindCSS.

1. Implement Val Town API key authentication
2. Implement password-based authentication
3. Add refresh token support
4. Add user profile management
5. Add role-based access control