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Using SAML, what is the method to authenticate a user in Firebase while working with React Native and Expo?

asked 2022-10-02 11:00:00 +0000

devzero gravatar image

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answered 2023-03-18 16:00:00 +0000

david gravatar image

To authenticate a user in Firebase while working with React Native and Expo using SAML, follow these steps:

  1. Set up Firebase Authentication to use SAML.
  2. Install expo-auth-session and react-native-app-auth packages in your project.
  3. Create a SAML provider in Firebase console with the ACS URL and Entity ID.
  4. Modify your App.js file to include the following code:
import React, { useState } from 'react';
import { Button, StyleSheet, Text, View } from 'react-native';
import * as AppAuth from 'expo-app-auth';
import * as WebBrowser from 'expo-web-browser';
import * as firebase from 'firebase';

const config = {
  issuer: '<SAML_PROVIDER_ISSUER>',
  scopes: ['openid', 'profile', 'email'],
  clientId: '<SAML_CLIENT_ID>',
  redirectUrl: AppAuth.OAuthRedirect + '<SAML_CLIENT_ID>',
  additionalParameters: {},
};

firebase.initializeApp({
  apiKey: '<API_KEY>',
  authDomain: '<AUTH_DOMAIN>',
  projectId: '<PROJECT_ID>',
});

export default function App() {
  const [user, setUser] = useState(null);

  const login = async () => {
    try {
      const authResult = await AppAuth.authAsync(config);
      const { idToken } = authResult.params;
      const credential = firebase.auth.SAMLAuthProvider.credential(idToken);
      const res = await firebase.auth().signInWithCredential(credential);
      setUser(res.user);
    } catch (e) {
      console.log('Error:', e.message);
    }
  };

  const logout = async () => {
    try {
      await firebase.auth().signOut();
      setUser(null);
    } catch (e) {
      console.log('Error:', e.message);
    }
  };

  return (
    <View style={styles.container}>
      <Text style={styles.title}>Firebase Authentication</Text>
      {user ? (
        <>
          <Text style={styles.text}>Welcome, {user.email}!</Text>
          <Button title="Logout" onPress={logout} />
        </>
      ) : (
        <>
          <Text style={styles.text}>Please sign in</Text>
          <Button title="Login with SAML" onPress={login} />
        </>
      )}
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
  },
  title: {
    fontWeight: 'bold',
    fontSize: 20,
    marginBottom: 20,
  },
  text: {
    fontSize: 16,
    marginBottom: 20,
  },
});
  1. Replace the placeholders (<SAML_PROVIDER_ISSUER>, <SAML_CLIENT_ID>, <API_KEY>, <AUTH_DOMAIN>, and <PROJECT_ID>) with your own values.
  2. Run the app and test the SAML authentication flow.

Note: Make sure to enable SAML login in your Firebase project's authentication settings.

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Asked: 2022-10-02 11:00:00 +0000

Seen: 9 times

Last updated: Mar 18 '23