Firebase offers a great number of options to implement Login in your app. Some of which are:
- Using Email.
- Using Phone number.
- Using Google.
- Using Facebook etc.
The best part is you don’t have to worry about handling the login flow, Firebase takes care of it.
Approach:
First of all, create a Firebase project by following these steps:
- Go to https://console.firebase.google.com/ and login with your google account.
- Create a project on Firebase.
- Add Firebase SDKs to your app.
<!– Insert these scripts inside your body tag –>
<body>
<!–This is the most important script that has to be added –>
<script src=”/__/firebase/7.14.4/firebase-app.js”></script>
<!– In order to use Google login add this script –>
<script src=”/__/firebase/7.14.4/firebase-auth.js”></script>
</body>
- Now that we have added these scripts in our app, we will now initialize the Firebase in our app.
- In the Firebase console go to the app settings, from there copy App config object and paste it in your code.
- App config object looks like this.
var firebaseConfig = { apiKey: "your-api-key", authDomain: "your-project-id.firebaseapp.com", databaseURL: "https://your-project-id.firebaseio.com", projectId: "your-project-id", storageBucket: "your-project-id.appspot.com", messagingSenderId: "the-sender-id", appId: "the-app-id", measurementId: "G-measurement-id", };
- If you followed these steps correctly your app will be registered with Firebase.
Now, we will enable google login in our app by following these steps:
- Go to the Firebase console and open Auth section
- Enable google sign on the sign in method tab and save the settings.
- In your app create a google provider object to handle login flow.
const GoogleAuth = new firebase.auth.GoogleAuthProvider();
- Authenticate user by using the instance of object that you created with the Firebase.
- You can either redirect the user to sign in page or open a pop-up window.
//To sign in with pop-up. firebase.auth().signInWithPopup(googleAuth); //To sign in with redirect. firebase.auth().signInWithRedirect(googleAuth);
- Google Login method is implemented in your app, now you are good to go.
Example:
We will create a simple react based web app with just the login button.
Code for the button component:
import React, { Component } from "react" ;
import firebase from 'firebase' ;
class tutorial extends Component{ render(){ return (
<div> <button
onClick={() => {
// Google provider object is created here.
const googleAuth =
new firebase.auth.GoogleAuthProvider();
// using the object we will authenticate the user.
firebase.auth().signInWithPopup(googleAuth);
}} >
Sign in with Google
</button>
</div>
);
}
}
export default tutorial;
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Code for your Firebase.ts file:
import * as firebase from 'firebase' ;
const firebaseConfig = { apiKey: "****" ,
authDomain: "****.firebaseapp.com" ,
projectId: "****" ,
storageBucket: "****.appspot.com" ,
messagingSenderId: "****" ,
appId: "****" ,
measurementId: "****"
}; class Firebase { constructor() {
firebase.initializeApp(firebaseConfig);
}
} export default Firebase;
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Output: