Let Me Click And Send for Server

A simple Minecraft server-side mod, that replaces all non-command run_command content with a custom command,
to bypass client-side restrictions since 1.19.1-rc1

If you want a more direct solution, here's a client-side only mod that does the same thing:
LetMeClickAndSend

Mod	Side	Advantage	Disadvantage
LetMeClickAndSend	client	Exactly the same behavior as pre mc1.19.1	Needs to be installed on all players' clients
LetMeClickAndSendForServer	server	No need to install on client	Reduces maximum chat message length by 7

Example

Let's run the following command, and then click the shown text

# Minecraft [1.7, 1.21.5)
/tellraw @a {"text":"click me to send \"hi\"","clickEvent":{"action":"run_command","value":"hi"}}

In vanilla 1.19.1 ~ 1.21.4, after clicking, you are not able to say anything since hi is not a valid command (not starts with /)

With this mod, the server will automatically replace the value field in the click event above with /lmcas hi,
so the client can "send" the message without any issue after the click

On command received, the server will broadcast a message with the same format as a player message, simulating the player saying "hi" in chat

MC 1.21.5+

Since MC 1.21.5, the run_command behavior has changed a lot

First is the change in command syntax, which has little impact:

# Minecraft [1.21.5, ~)
/tellraw @a {"text":"click me to send \"hi\"","click_event":{"action":"run_command","command":"hi"}}

Next is the change in behavior, which has a greater impact:

• The command value is always valid, regardless of whether it starts with a / or not
• The client will strip the / prefix from the command value and send the remaining string as a command

It's no longer possible to correctly distinguish between "a run_command for sending chat message" and "a run_command for sending command"

As a workaround, LetMeClickAndSendForServer for MC >= 1.21.5 will only replace certain command with the /lmcas command.
By default, only command value starting with !!, which is a commonly-used command prefix
in MCDReforged plugin ecosystem, will be replaced

A config file located at ./config/letmeclickandsendforserver/config.json is added for customizing the replacing behavior

{
    "replacePattern": "!!.*"
}

The replacePattern should be a valid regex pattern. All command values that fully match the pattern will be replaced with the /lmcas command

To test with the default configuration, you can use:

/tellraw @a {"text":"click me to send \"!!MCDR\"","click_event":{"action":"run_command","command":"!!MCDR"}}

Requirements

It's a server-side only mod. It requires 0 extra dependency