How to make multiple apps redirect to same login page hosting Google OAuth and make it redirect to corresponding app upon successful authentication?

• spring-authorization-server

  13 4,723 9.4 Java

  Spring Authorization Server

  

Most of the time, and most examples, will be about using OAuth as a client. But in your case you want to have your own OAuth and Open ID server which will be federated with Facebook and Google. All that means is that you will then have an OAuth server that is also someone else's client, such that your apps authenticate with your server which then uses their servers to actually identify users. This will also come in handy later if you want to set up permissions and what not. Besides Keycloak you might want to look into WSO2 IS or Auth0. Keycloak and WSO2 IS can be run locally, while Auth0 is a cloud service. I'd go with either Keycloak or Auth0. If you go the Spring Authorization Server route, they rolled up an example of federation on the project's Github page. Oauth can be pretty complicated though so I'd suggest that you start off with a ready-made solution. If you stick to Spring Oauth2 Client and avoid things like using Keycloak's specific adapter, it should be easy enough to swap OAuth servers later on. Regarding SAML, I've never used it. I think OAuth is way more prevalent in web development. Here's a comparison, I found it informative. You mentioned tutorials... I bought this course on Udemy last year and it was pretty nice. I browsed some tutorials, and I think this is what you need if you go with Keycloak, assuming you're using Keycloak on the server. If you want to authenticate users on the frontend (running on the browser), you'll want a PKCE flow example.

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