[daniel-skopek]

Added to the API:

getPendingPlayer(InetSocketAddress address)

Get a pending FloodgatePlayer by their connection address.
This is useful in PreLoginEvent where UUID is not yet available.

getPendingPlayerByUsername(String rawUsername)

Get a pending FloodgatePlayer by their raw username (without prefix).
This is useful in PreLoginEvent where the username hasn't been modified yet.

[Tim203]

I think that indeed some API is currently missing for the early stages, especially since Floodgate already knows whether the player is a valid Floodgate player when it receives the handshake packet.
I think I already addressed this by introducing connectionByPlatformIdentifier in a future version of Floodgate (the one where Floodgate is automatically available with Geyser). Depending on the platform you can use specific identifiers: E.g. Player for Spigot or ProxiedPlayer/PendingConnection for Bungee.
I do see that InetSocketAddress is currently not part of that list, I can look into maybe adding that one as well but that one is probably not needed if you can use those other platform identifiers I mentioned.
Depending on how long we think we need before the release of that version, we may want to consider backporting it. I'll ask around internally what we think of that idea.