Google Sign-In for server-side applications

To utilize Google benefits for the benefit of a client when the client is disconnected, you should utilize a mixture server-side stream where a client approves your application on the customer side utilizing the JavaScript API customer and you send an extraordinary one-time approval code to your server. Your server trades this one-time-use code to obtain its own entrance and invigorate tokens from Google for the server to have the option to make its own API calls, which should be possible while the client is disconnected. This one-time code stream has security favorable circumstances over both an unadulterated server-side stream and over sending access tokens to your server.

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Significant: The Google Sign-In server-side stream contrasts from the OAuth 2.0 for Web server applications stream.

 The sign-in stream for acquiring an entrance token for your server-side application is outlined beneath.  

Once codes have a few security preferences. With codes, Google gives tokens straightforwardly to your server with no middle people. Despite the fact that we don't suggest spilling codes, they are difficult to use without your customer mystery. Keep your customer mystery!

Actualizing the one-time-code stream

The Google Sign-In button gives both an entrance token and an approval code. The code is a one-time code that your server can trade with Google's servers for an entrance token.

The accompanying example code shows how to do the one-time-code stream.

Validating Google Sign-In with one-time-code stream expects you to:

Stage 1: Create a customer ID and customer mystery

To make a customer ID and customer mystery, make a Google API Console venture, set up an OAuth customer ID, and register your JavaScript birthplaces:

Go to the Google API Console.

From the venture drop-down, select a current undertaking, or make another one by choosing Create another task.

Note: Use a solitary venture to hold all stage occurrences of your application (Android, iOS, web, and so on.), each with an alternate Client ID.

In the sidebar under "APIs and Services", select Credentials, at that point click Configure assent screen.

Pick an Email Address, indicate a Product Name, and press Save.

In the Credentials tab, select the Create qualifications drop-down rundown, and pick OAuth customer ID.

Under Application type, select Web application.

Register the beginnings from which your application is permitted to get to the Google APIs, as follows. A source is an extraordinary mix of convention, hostname, and port.

In the Authorized JavaScript inceptions field, enter the cause for your application. You can enter numerous beginnings to take into consideration your application to run on various conventions, areas, or subdomains. You can't utilize special cases. In the model beneath, the subsequent URL could be a creation URL.

http://localhost:8080

https://myproductionurl.example.com

The Authorized divert URI field doesn't require a worth. Divert URIs are not utilized with JavaScript APIs.

Press the Create button.

From the subsequent OAuth customer discourse box, duplicate the Client ID. The Client ID lets your application get to empowered Google APIs.

Stage 2: Include the Google stage library on your page

Incorporate the accompanying contents that exhibit an unknown capacity that embeds a content into the DOM of this index.html website page.

Stage 3: Initialize the GoogleAuth object

Burden the auth2 library and call gapi.auth2.init() to introduce the GoogleAuth object. Determine your customer ID and the extensions you need to demand when you call init().

Stage 4: Add the sign-in catch to your page

Add the sign-in catch to your website page, and join a tick handler to call grantOfflineAccess() to begin the one-time-code stream.