chore: add more platform demos

examples/better-auth/README.md

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+# Better Auth Integration for RivetKit
+
+Example project demonstrating authentication integration with [RivetKit](https://rivetkit.org) using Better Auth.
+
+[Learn More →](https://github.com/rivet-gg/rivetkit)
+
+[Discord](https://rivet.gg/discord) — [Documentation](https://rivetkit.org) — [Issues](https://github.com/rivet-gg/rivetkit/issues)
+
+## Getting Started
+
+### Prerequisites
+
+- Node.js 18+
+- npm or pnpm
+
+### Installation
+
+```sh
+git clone https://github.com/rivet-gg/rivetkit
+cd rivetkit/examples/better-auth
+npm install
+```
+
+### Development
+
+```sh
+npm run dev
+```
+
+Open your browser to `http://localhost:5173` to see the frontend and the backend will be running on `http://localhost:6420`.
+
+## Features
+
+- **Authentication**: Email/password authentication using Better Auth
+- **Protected Workers**: RivetKit workers with authentication via `onAuth` hook
+- **Real-time Chat**: Authenticated chat room with real-time messaging
+- **SQLite Database**: Persistent user data and session storage
+
+## How It Works
+
+1. **Better Auth Setup**: Configured with SQLite adapter for user storage
+2. **Protected Worker**: The `chatRoom` worker uses the `onAuth` hook to verify user sessions
+3. **Frontend Integration**: React components handle authentication flow and chat interface
+4. **Session Management**: Better Auth handles session creation, validation, and cleanup
+
+## Key Files
+
+- `src/backend/auth.ts` - Better Auth configuration with SQLite
+- `src/backend/registry.ts` - RivetKit worker with authentication
+- `src/frontend/components/AuthForm.tsx` - Login/signup form
+- `src/frontend/components/ChatRoom.tsx` - Authenticated chat interface
+
+## License
+
+Apache 2.0

examples/better-auth/package.json

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+{
+  "name": "example-better-auth",
+  "version": "0.9.0-rc.1",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "concurrently \"npm run dev:backend\" \"npm run dev:frontend\"",
+    "dev:backend": "tsx --watch src/backend/server.ts",
+    "dev:frontend": "vite",
+    "build": "vite build",
+    "check-types": "tsc --noEmit",
+    "test": "vitest run"
+  },
+  "devDependencies": {
+    "@types/node": "^22.13.9",
+    "@types/react": "^18.2.0",
+    "@types/react-dom": "^18.2.0",
+    "@vitejs/plugin-react": "^4.2.0",
+    "concurrently": "^8.2.2",
+    "rivetkit": "workspace:*",
+    "tsx": "^3.12.7",
+    "typescript": "^5.5.2",
+    "vite": "^5.0.0",
+    "vitest": "^3.1.1"
+  },
+  "dependencies": {
+    "@hono/node-server": "^1.14.4",
+    "@rivetkit/memory": "workspace:0.9.0-rc.1",
+    "@rivetkit/react": "workspace:0.9.0-rc.1",
+    "better-auth": "^1.0.1",
+    "hono": "^4.7.0",
+    "react": "^18.2.0",
+    "react-dom": "^18.2.0"
+  },
+  "example": {
+    "platforms": [
+      "*"
+    ]
+  },
+  "stableVersion": "0.8.0"
+}

examples/better-auth/src/backend/auth.ts

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+import { betterAuth } from "better-auth";
+import { sqliteAdapter } from "@better-auth/sqlite";
+import Database from "better-sqlite3";
+
+const db = new Database("./auth.db");
+
+export const auth = betterAuth({
+	database: sqliteAdapter(db),
+	emailAndPassword: {
+		enabled: true,
+	},
+	session: {
+		expiresIn: 60 * 60 * 24 * 7, // 7 days
+		updateAge: 60 * 60 * 24, // 1 day (every day the session expiry is updated)
+	},
+	plugins: [],
+});
+
+export type Session = typeof auth.$Infer.Session;
+export type User = typeof auth.$Infer.User;

examples/better-auth/src/backend/registry.ts

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+import { worker, setup } from "rivetkit";
+import { auth, type Session, type User } from "./auth";
+
+export const chatRoom = worker({
+	onAuth: async (c) => {
+		const authResult = await auth.api.getSession({
+			headers: c.req.headers,
+		});
+
+		if (!authResult?.session || !authResult?.user) {
+			throw new Error("Unauthorized");
+		}
+
+		return {
+			userId: authResult.user.id,
+			user: authResult.user,
+			session: authResult.session,
+		};
+	},
+	state: { 
+		messages: [] as Array<{ id: string; userId: string; username: string; message: string; timestamp: number }> 
+	},
+	actions: {
+		sendMessage: (c, message: string) => {
+			const newMessage = {
+				id: crypto.randomUUID(),
+				userId: c.auth.userId,
+				username: c.auth.user.email,
+				message,
+				timestamp: Date.now(),
+			};
+
+			c.state.messages.push(newMessage);
+			c.broadcast("newMessage", newMessage);
+
+			return newMessage;
+		},
+		getMessages: (c) => {
+			return c.state.messages;
+		},
+	},
+});
+
+export const registry = setup({
+	workers: { chatRoom },
+});
+
+export type Registry = typeof registry;

examples/better-auth/src/backend/server.ts

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+import { registry } from "./registry";
+import { auth } from "./auth";
+import { Hono } from "hono";
+import { serve } from "@hono/node-server";
+import { createMemoryDriver } from "@rivetkit/memory";
+
+// Setup router
+const app = new Hono();
+
+// Start RivetKit
+const { client, hono } = registry.run({
+	driver: createMemoryDriver(),
+	cors: {
+		// IMPORTANT: Configure origins in production
+		origin: "*",
+	},
+});
+
+// Mount Better Auth routes
+app.on(["GET", "POST"], "/api/auth/**", (c) => auth.handler(c.req.raw));
+
+// Expose RivetKit to the frontend
+app.route("/registry", hono);
+
+// Example HTTP endpoint to join chat room
+app.post("/api/join-room/:roomId", async (c) => {
+	const roomId = c.req.param("roomId");
+
+	// Verify authentication
+	const authResult = await auth.api.getSession({
+		headers: c.req.header(),
+	});
+
+	if (!authResult?.session || !authResult?.user) {
+		return c.json({ error: "Unauthorized" }, 401);
+	}
+
+	try {
+		const room = client.chatRoom.getOrCreate(roomId);
+		const messages = await room.getMessages();
+
+		return c.json({ 
+			success: true, 
+			roomId,
+			messages,
+			user: authResult.user 
+		});
+	} catch (error) {
+		return c.json({ error: "Failed to join room" }, 500);
+	}
+});
+
+serve({ fetch: app.fetch, port: 6420 }, () =>
+	console.log("Listening at http://localhost:6420"),
+);

examples/better-auth/src/frontend/App.tsx

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+import { useState, useEffect } from "react";
+import { authClient } from "./auth-client";
+import { AuthForm } from "./components/AuthForm";
+import { ChatRoom } from "./components/ChatRoom";
+
+function App() {
+	const [user, setUser] = useState<{ id: string; email: string } | null>(null);
+	const [loading, setLoading] = useState(true);
+
+	useEffect(() => {
+		// Check if user is already authenticated
+		const checkAuth = async () => {
+			try {
+				const session = await authClient.getSession();
+				if (session.data?.user) {
+					setUser(session.data.user);
+				}
+			} catch (error) {
+				console.error("Auth check failed:", error);
+			} finally {
+				setLoading(false);
+			}
+		};
+
+		checkAuth();
+	}, []);
+
+	const handleAuthSuccess = async () => {
+		try {
+			const session = await authClient.getSession();
+			if (session.data?.user) {
+				setUser(session.data.user);
+			}
+		} catch (error) {
+			console.error("Failed to get user after auth:", error);
+		}
+	};
+
+	const handleSignOut = () => {
+		setUser(null);
+	};
+
+	if (loading) {
+		return (
+			<div style={{ 
+				display: "flex", 
+				justifyContent: "center", 
+				alignItems: "center", 
+				height: "100vh" 
+			}}>
+				Loading...
+			</div>
+		);
+	}
+
+	return (
+		<div style={{ minHeight: "100vh", backgroundColor: "#f0f0f0" }}>
+			<div style={{ padding: "20px 0" }}>
+				<h1 style={{ textAlign: "center", marginBottom: "30px" }}>
+					RivetKit with Better Auth
+				</h1>
+
+				{user ? (
+					<ChatRoom user={user} onSignOut={handleSignOut} />
+				) : (
+					<AuthForm onAuthSuccess={handleAuthSuccess} />
+				)}
+			</div>
+		</div>
+	);
+}
+
+export default App;

examples/better-auth/src/frontend/auth-client.ts

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+import { createAuthClient } from "better-auth/react";
+
+export const authClient = createAuthClient({
+	baseURL: "http://localhost:6420",
+});