Passkey signer error when using Bitwarden extension

[nlordell]

This issue was originally posted by @richardhenry in safe-global/safe-modules#500

Description

One of our users is experiencing issues using the passkey signer with their Safe wallet in my dapp. I think the issue is that they are using the Bitwarden Chrome extension for passkeys/passwords, which doesn't seem to provide passkey data as an ArrayBuffer. This is probably non-standard behavior, but Bitwarden otherwise works fine for general passkey sign-in, so I suspect that maybe the WebAuthn code in the Safe library needs to be more robust.

Here is the error that they were seeing in their browser console:

Environment

• @safe-global/[email protected]
• @safe-global/[email protected]
• Chrome 130.0.6723.91 (Official Build) (arm64)
• macOS Sonoma 14.6
• Bitwarden browser extension 48.0

Steps to reproduce

1. Use Google Chrome with the Bitwarden browser extension
2. Call signSafeOperation with a passkey signer

[nlordell]

Thanks for the detailed issue report.

Any chance you can console.log the data passed into the DataView constructor? According to the WebAuthn standard it should be an ArrayBuffer and would be surprised if it were something else.

[richardhenry]

It looks like Bitwarden is providing a Uint8Array instead of an ArrayBuffer, and I'm also seeing just a plain Array type in our logs from some other unknown password manager. I have a fix for this that is working for our users - I'll open a PR. Thanks!