Twitter

Overview

Adding a Login with Twitter button to FusionAuth is simple, and this guide will walk you through the steps necessary to collect the credentials from Twitter in order to enable this Social login.

Once you have completed this configuration you will be able to enable the Twitter login button for one or more FusionAuth Applications. Below is an example login page with the Twitter Identity Provider enabled.

Here's a diagram of the login flow between:

• the user
• your application
• FusionAuth and
• a remote identity provider such as Twitter

Logging In Using Twitter

Although this looks complex, the user only sees a few screens, such as the FusionAuth login screen, the Twitter login screen, and your application.

Create a Twitter Account

Ensure you have a Twitter account, and then navigate to the Twitter Developer Portal.

If you do not yet have a developer account, you will need to apply for access to the Twitter API.

https://developer.twitter.com/en/apply-for-access.html

Once you have logged into Twitter and have obtained access to a Twitter developer account, continue to the next step.

Create a Twitter App

Twitter allows you to create an application as part of the developer account setup. If you do not yet have a Twitter app you will need to create one in this step. Application creation is restricted according to the level of access you have in your Twitter project. You will need to apply for elevated access to be able to create more than one app in your Twitter project as well as to get access to settings that are otherwise restricted in Essential access mode. You can learn more about access levels and permissions here. If you already have a Twitter app that you plan to use for FusionAuth please review this section anyway to ensure your configuration is correct to support the Twitter login.

You can view a list of your Twitter apps on the Twitter Developer Portal dashboard.

In the following sections we go through the configurations that you will need to set in your app to allow Twitter to connect with FusionAuth.

Record the Keys and Token

The API key and API secret key are typically presented at the onset of app creation. Record these values. They will be needed for later integration with the FusionAuth Identity Provider.

Authentication Settings

You will need to modify a few settings to enable Twitter to connect with FusionAuth.

Under User authentication settings modify the app settings as below:

Add a Callback URI

See label for step 1

Under the App Info section register a Callback URI / Redirect URL and specify your website URL.

In this example we are registering https://login.piedpiper.com/oauth2/callback as the callback URI. The redirect URL must be set to an absolute URL in the Twitter console for your application. If the hostname for your FusionAuth app is login.piedpiper.com, the redirect URL would be https://login.piedpiper.com/oauth2/callback.

Enable Request Email

See label for step 2

To link your users by email, you will want to ensure you have checked Request email from users . Please note, for some Twitter users, it is possible to create an account without an email address. If this is the case for your Twitter users, you will want to configure the IdP below to link on a username, or use a reconcile lambda to map custom claims returned from Twitter. See Linking Strategies which discusses workaround options.

Keys and Tokens

Under the Keys and tokens section you will find the Consumer API Keys and Secret. These two values are the same values that were presented to you during app creation and will be used to configure the FusionAuth Identity Provider.

Create a Twitter Identity Provider

The last step will be to create a Twitter Identity Provider in FusionAuth. To create an Identity Provider navigate to Settings -> Identity Providers and click Add Twitter from the dropdown.

This will take you to the Add Twitter page, and you’ll fill out the Consumer key and Consumer secret required fields using the values found in the Twitter App Keys and tokens tab from the previous step.

The button text is also required but it will be defaulted to Login with Twitter, you may optionally modify this default value.

To enable this identity provider for an application, find your application name in the Applications configuration section at the bottom of this panel. You will always see the FusionAuth application, this application represents the FusionAuth administrative user interface. If you wish to be able to log into FusionAuth with this provider, you may enable this application.

In the following screenshot you will see that we have enabled this login provider for the Pied Piper application and enabled Create registration. Enabling create registration means that a user does not need to be manually registered for the application prior to using this login provider.

For example, when a new user attempts to log into Pied Piper using Twitter, if their user does not exist in FusionAuth it will be created dynamically, and if the Create registration toggle has been enabled, the user will also be registered for Pied Piper and assigned any default roles assigned by the application.

If you do not wish to automatically provision a user for this application when logging in with Twitter, leave Create registration off. You will need to manually register a user for this application before they may Sign in with Twitter.

That's it, now the Sign in with Twitter button will show up on the login page for the Pied Piper application.

Form Fields

Proxy details

If you are running FusionAuth behind a proxy of some sort, please review the following information.

FusionAuth will detect the public URL of your instance at runtime to send to Twitter as the callback URL. If you are behind a proxy, ensure that the X-Forwarded-Host and the X-Forwarded-Proto headers are added by your proxy if the host or protocol do not match what is behind the proxy. For example, if your public URL is using https and your proxy is performing SSL acceleration the URL behind the proxy may be http. In this scenario, most proxies will have added the X-Forwarded-Proto header to the request which will allow FusionAuth to send the correct URL to Twitter.

Building Your Own Integration

If you are building your own login experience, you'll want to start the identity provider flow yourself and then complete the login.

You might do this if you are using the Login API rather than using the hosted FusionAuth login pages. Here's a diagram illustrating this login flow.

An Integration With An Identity Provider Using The API

Completing the login is documented further in the API.

If you require a refresh token after completing the login, ensure Enable JWT Refresh is true in the application configuration. This is found in the administrative user interface by navigating to Applications -> Your Application -> Security -> Login API settings.