UnsignedChat

UnsignedChat

Lets your proxy plugins cancel or edit chat and commands from 1.19.3+ players without kicking them.

The problem

Since 1.19.1, clients sign their chat. When a proxy plugin cancels or changes a signed message (for example 'ChatResult.denied()' on Velocity), the player gets kicked with "A plugin tried to cancel a signed chat message". On BungeeCord, changes to signed messages are ignored or break the chat chain.

The fix

UnsignedChat removes the signatures on the proxy, before your plugins see the message, and hides the client's chat session from the backends. After that, you can deny or modify chat and commands normally.

Features

• One jar for both Velocity and BungeeCord
• Proxy only: nothing to install on backend servers
• Backends from 1.8 to 1.21.x
• Tiny (about 30 KB), no dependencies
• Fails safe: if a proxy update changes its internals, it logs a warning and does nothing instead of crashing
• Config file and a stats command

Installation

• Put the jar in your proxy's plugins folder.
• On every 1.19.3+ backend, set enforce-secure-profile=false in server.properties.
• Restart the proxy.

Commands and permissions

/unsignedchat (alias /uchat) shows stats. Permission: unsignedchat.admin

Config

plugins/UnsignedChat/config.properties lets you turn chat stripping, command stripping and session hiding on or off.

Good to know

• Don't use it together with SignedVelocity.
• Clients on 1.19 to 1.19.2 aren't covered.
• Players can't report chat sent through the proxy, since the signatures are removed.
• On BungeeCord, modified messages are applied through 'ChatEvent#setMessage'.

Source code HERE