A library that integrates webauthn4j in a Play framework app,
providing the server-side registration and verification services of the Web Authentication standard.

This library provides a PasskeyAuth class, which gives you:

1. a verification action that can be composed with other action builders
2. a controller that can be included in a Play routes file to perform standard passkey operations.

The library is storage-agnostic. You must decide how best to store passkey data in your infrastructure. Consequently, the integration depends on the implementation of some service traits.

Add to your build.sbt:

libraryDependencies += "com.gu" %% "play-passkey-auth" % "<version>"

See the example directory for a complete, working Play application that demonstrates:

• Registering new passkeys
• Authenticating with passkeys
• Managing (listing and deleting) passkeys
• In-memory repository implementations

Run the example:

sbt "project example" run

Then open http://localhost:9000 in your browser.

1. Define a User instance for your user type.
2. Implement a PasskeyRepository.
3. Implement a PasskeyChallengeRepository.
4. Implement a CreationDataExtractor.
5. Implement an AuthenticationDataExtractor.
6. Implement a PasskeyNameExtractor.
7. Implement a UserExtractor.
8. Bundle the extractors and user action into a PasskeyAuthContext.
9. Create a HostApp describing your application (name and URI).
10. Pass the repositories, HostApp, and PasskeyAuthContext into a PasskeyAuth.

show actual Scala/Play code how to handle common failure cases how it fits into existing Play apps