FedCM support

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FedCM

Impacted environment

In which environment would the proposed feature apply ?

• The browser
• Node.js
• Other (please specify): ...
• I'm not sure.

Feature suggestion

Add support for FedCM (FPWD), which is on the REC track in FedID WG

Expected functionality/enhancement

The best example of how it could work with Solid-OIDC might be how it was implemented for IndieAuth.
https://indieweb.org/FedCM_for_IndieAuth

It can already be tested in Chrome behind flags.

There is also Lightweight FedCM proposal which works in Firefox nightly.
IndieAuth should also have it figured out soon.

Actual functionality/enhancement

The user will not have to enter the URL of their OP/IDP, not even their WebID. They will select their registered IDP from a small widget displayed by the browser.

Use Cases

Improved UX in the web browser.

Additional information

@thhck have done a prototype for CSS https://github.com/w3c-fedid/idp-registration/issues/2#issuecomment-2334798424
I will coordinate with him to land everything that's needed in CSS.

@acoburn is also familiar with FedCM progress.

This feature is now tracked as IdP Registration API and needs implementation feedback and interest signals.

Start by reviewing the browser authentication flow and the existing Solid-OIDC integration, then compare it with the linked IndieAuth FedCM example and the IdP Registration API. Coordinate with the referenced contributors and CSS prototype; done means the library has an agreed implementation of browser-mediated FedCM support.