React Higher Order Components Higher Order Component that checks for authentication
Example
Let's say we have a component that should only be displayed if the user is logged in.
So we create a HOC that checks for the authentication on each render():
AuthenticatedComponent.js
import React from "react";
export function requireAuthentication(Component) {
return class AuthenticatedComponent extends React.Component {
/**
* Check if the user is authenticated, this.props.isAuthenticated
* has to be set from your application logic (or use react-redux to retrieve it from global state).
*/
isAuthenticated() {
return this.props.isAuthenticated;
}
/**
* Render
*/
render() {
const loginErrorMessage = (
<div>
Please <a href="/login">login</a> in order to view this part of the application.
</div>
);
return (
<div>
{ this.isAuthenticated === true ? <Component {...this.props} /> : loginErrorMessage }
</div>
);
}
};
}
export default requireAuthentication;
We then just use this Higher Order Component in our components that should be hidden from anonymous users:
MyPrivateComponent.js
import React from "react";
import {requireAuthentication} from "./AuthenticatedComponent";
export class MyPrivateComponent extends React.Component {
/**
* Render
*/
render() {
return (
<div>
My secret search, that is only viewable by authenticated users.
</div>
);
}
}
// Now wrap MyPrivateComponent with the requireAuthentication function
export default requireAuthentication(MyPrivateComponent);
This example is described in more detail here.
