When using server-side redirects you provide the URL of the API endpoint that will receive the token and other login session details as parameters. The native app will redirect the webview to this URL after a successful login. If the user has cancelled the login process, the error parameter will contain an error message.

Median JavaScript Bridge methods and parameters

median.socialLogin.facebook.login({ 
  'redirectUri' : '<endpoint>', 
  'scope' : '<text>', 
  'state' : '<text>' 
});
median.socialLogin.google.login({ 
  'redirectUri' : '<endpoint>', 
  'state' : '<text>' 
});
median.socialLogin.apple.login({ 
  'redirectUri' : '<endpoint>', 
  'scope' : '<text>', 
  'state' : '<text>' 
});

redirectUri - the GET endpoint that will be requested after the Social Login flow is completed. The tokens will be added as parameters to this request.
scope - determines the access that your app requires. Check the official documentation for each of the social login providers for specifics for each platform.
state - optional string parameter that you can include in the above methods to verify that your app is originating the request. If included, the state parameter will be passed in the Redirect URL after a successful login.

Redirect URL API endpoint parameters

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[1] User profile only sent for initial login

Apple only returns a user's complete profile with fields such as firstName and lastName the first time the user authenticates for your app. You must securely save the user profile information for future purposes as subsequent authorization requests will only contain an identity token in the form of JSON Web Token (JWT), authorization code, and user identifier to your app. Parsing the JWT will return additional fields such as email, email_verified, etc. Refer to this documentation for more info.

Example Login Button

<button class="google-login native-only" 
  onclick="median.socialLogin.google.login({ 'redirectUri' : 'https://median.dev/social-login/redirect-demo/redirect.html' });">
	Log in With Google
</button>

In this example, the Median JavaScript Bridge endpoint is activated when the anchor tag is clicked. After the user has logged in within the native app, the webview will be redirected to https://median.dev/social-login/redirect-demo/redirect.html?idToken=example.

Backend Requirements

Your backend server must be configured to accept the idToken, parse it as a JWT token to access the user details, and create a login session for the user.