If authentication is necessary, consider implementing an auth context in your application. To do this, create an AuthProvider component which serves as the root component of your app. Within this component, you can validate whether the user is authenticated or not. If the user is not authenticated, you can redirect them to the login page.
import React, { createContext, useState, useEffect } from 'react';
import { useRouter } from 'next/router';
type ContextType = {
// Define your desired ContextType values here
};
const AuthContext = createContext<ContextType>({});
export const AuthProvider: React.FC = ({ children }) => {
const router = useRouter();
const [authenticated, setAuthenticated] = useState<boolean>(false);
const [user, setUser] = useState<UserType | undefined>();
useEffect(() => {
if (!authenticated) {
router.replace(
`/login?callbackUrl=${router.asPath.replace('/', '').replace(/&/g, '_')}`
);
return;
}
if (authenticated) {
// go to default page
if (!router.query.callbackUrl) {
router.replace('/dashboard');
return;
}
// redirects to callback url
router.replace(`/${router.query.callbackUrl.replace(/_/g, '&')}`);
}
}, [authenticated]);
useEffect(() => {
setAuthenticated(!!user);
}, [user]);
const value = React.useMemo(
() => ({
// add all your desired ContextType values here
// e.g., user, setUser, authenticated
}),
[
// add any dependencies that should trigger a re-render here
// e.g., user, authenticated
]
);
return (
<AuthContext.Provider value={value}>
{children}
</AuthContext.Provider>
);
};
export const useAuth = (): ContextType => {
const context = React.useContext(AuthContext);
if (!context) throw new Error('Auth context is invalid');
return context;
};
Now, in your _app.tsx file:
import React from 'react';
import { AuthProvider } from './auth-context';
const App: React.FC<AppProps> = ({ Component, pageProps }) => {
return (
<AuthProvider>
<Component {...pageProps} />
</AuthProvider>
);
};
export default App;
In your login page, you can now use the auth context:
// Import setUser from useMemo
// Use setUser to handle user login
import React from 'react';
import { useAuth } from './auth-context';
const LoginPage: React.FC = () => {
const { setUser } = useAuth();
// Handle login logic here
setUser(userData);
};
export default LoginPage;
Now, whenever the authenticated variable changes, your app will redirect to the desired pages. This example provides a simplified implementation of using an auth context, which can be customized to fit your specific project requirements.
I have personally used this approach in multiple projects and it has proven to work effectively.