add support for fido:/ uri

[shadowwwind]

Currently after scanning a QR-code with a fido:/ URI it can not be opened in a supported application.

Scanning a fido:/ QR-code should allow the user to open it with a supported application.

The fido:/ URI is used for cross device authentication using passkeys and specifically used as QR-codes.

IANA assignment: https://www.iana.org/assignments/uri-schemes/prov/fido

FIDO spec: https://fidoalliance.org/specs/fido-v2.2-ps-20250714/fido-client-to-authenticator-protocol-v2.2-ps-20250714.html#hybrid-qr-initiated

Passchain is an app that supports FIDO URIs: https://codeberg.org/s1m/hw-fido2-provider

[markusfisch]

Binary Eye currently handles FIDO://... because its generic scheme handling expects the common scheme://... form. But FIDO URIs are registered as:

fido:/[base10 encoded CBOR]

So the single slash in fido:/... is intentional and valid.

This is not a lowercase/uppercase issue: URI schemes are case-insensitive, and lowercase is actually the canonical form. So fido:/... should be accepted just like FIDO:/....

The missing part in Binary Eye is recognizing this FIDO-specific URI shape and offering it as an openable URI. I’ll keep this issue open for adding proper fido:/... support.

[markusfisch]

Fixed in 4fab21c

A new version will be out soon.

[shadowwwind]

hmm I got 1.74.0 from F-Droid and unfortunately the URI still doesn't open. While it does work with the GrapheneOS Camera.

[markusfisch]

Well, do you have an example code? It works with all the samples I have.