Login with Microsoft Loop: Reprocess "OAuth" 2.0

If you want to integrate Microsoft Loop into your application and allow users to log in with their Microsoft accounts, you'll need to understand the OAuth 2.0 authorization flow. This guide will take you through the steps to set up a basic login flow using Microsoft's OAuth 2.0 implementation.

Getting Started

Before you begin, you'll need to create a new application in the Microsoft Application Registration Portal.

Register Your App

Follow these steps to create a new application in the Microsoft Application Registration Portal:

1. Sign in to the Microsoft Application Registration Portal using your Microsoft account.
2. Click the "Add an app" button.
3. Enter a name for your application and click "Create".
4. From the Overview page of your application, take note of the Application ID.

Configure Your App

Follow these steps to configure your application in the Microsoft Application Registration Portal:

1. From the Overview page of your application, click "Add Platform".
2. Choose "Web".
3. Enter the Redirect URI(s) for your application.
4. Under "Microsoft Graph Permissions", add the permissions your application will need to access user data.
5. Click "Save".

OAuth 2.0 Flow

Once you've registered and configured your application, you can implement the OAuth 2.0 flow to allow users to log in with their Microsoft accounts.

Authorization Request

To initiate the authorization flow, redirect the user to the following URL:

https://login.microsoftonline.com/common/oauth2/v2.0/authorize?scope=<SCOPE>&response_type=code&client_id=<CLIENT_ID>&redirect_uri=<REDIRECT_URI>&state=<STATE>

Replace <SCOPE> with the permissions your application needs, separated by %20. For example: https://graph.microsoft.com/User.Read%20Mail.Read.

Replace <CLIENT_ID> with your Application ID.

Replace <REDIRECT_URI> with the Redirect URI(s) you added to your application in the Microsoft Application Registration Portal.

Replace <STATE> with a unique value that your app will use to check the authenticity of the response from the authentication server.

Access Token Request

Once the user has authorized your application, they will be redirected back to the Redirect URI you specified in the authorization request, with a code parameter in the query string.

Your application can exchange this code for an access token by making a POST request to the following URL:

https://login.microsoftonline.com/common/oauth2/v2.0/token

Include the following parameters in the request body:

grant_type=authorization_code&code=<AUTHORIZATION_CODE>&client_id=<CLIENT_ID>&redirect_uri=<REDIRECT_URI>&client_secret=<CLIENT_SECRET>&scope=<SCOPE>

Replace <AUTHORIZATION_CODE> with the code parameter from the query string.

Replace <CLIENT_ID> with your application's Application ID.

Replace <REDIRECT_URI> with the Redirect URI(s) you added to your application in the Microsoft Application Registration Portal.

Replace <CLIENT_SECRET> with your application's client secret. Note that this value is only necessary for web apps and confidential clients.

Replace <SCOPE> with the permissions your application needs, separated by %20.

The response from the authentication server will include an access token and a refresh token, which your application can use to access the user's data.

Conclusion

Implementing Microsoft Loop login in your application requires understanding the OAuth 2.0 authorization flow. By following the steps outlined in this guide, you should be able to successfully integrate Microsoft Loop into your app.