Sign in through Steam with Java [closed]

Question

I want to use STEAM-LOGIN in my JSF2 web application. I found this in Steam Web API documentation:

"Steam can act as an OpenID provider. This allows your application to authenticate a user's SteamID without requiring them to enter their Steam username or password on your site (which would be a violation of the API Terms of Use.) Just download an OpenID library for your language and platform of choice and use http://steamcommunity.com/openid as the provider. The returned Claimed ID will contain the user's 64-bit SteamID. The Claimed ID format is: http://steamcommunity.com/openid/id/"

Here are my questions:

• There are several OpenID libraries for Java, which one should I use?
• I have no idea how to implement redirection to Steam login page and back to my page

I found some examples for PHP but nothing for Java.

Answer 1

You can use pac4j. It has openid connect support.

They also have several implementations that they offer here.

You can see here an example of pac4j's j2e implementation.